1. A ribbon cassette, comprising:
a driving mechanism configured to nip an ink ribbon using a driving roller and a driven roller to move the ink ribbon in a length direction through rotations of the rollers;
an ink replenishing mechanism having a roller-shaped ink tank impregnated with ink and a transfer roller that comes into contact with an outer circumference of the ink tank and configured to replenish the ink ribbon coming into contact with the transfer roller with the ink soaked through the ink tank via the transfer roller;
a case configured to cover the driving mechanism and the ink replenishing mechanism and provided with a tank cover portion formed at a portion opposing the ink tank to swell in a similar figure; and
a take-up operation knob provided on an outer surface of the case with an interval large enough to enable an operation of the knob from an outer circumference of the tank cover portion and linked to the driving roller disposed within the case by penetrating through the case.
2. The ribbon cassette according to claim 1, wherein:
a tip end of the operation knob is set to a height nearly equal to a height of a top surface of the tank cover.
3. The ribbon cassette according to claim 1, wherein:
a tip end of the operation knob is set to a height lower than a height of a top surface of the tank cover.
4. A printer, comprising:
a ribbon cassette accommodating a driving mechanism configured to move an ink ribbon in a length direction and an ink replenishing mechanism having a roller-shaped ink tank impregnated with ink and a transfer roller that comes into contact with an outer circumference of the ink tank and configured to replenish the ink ribbon with the ink soaked through the ink tank via the transfer roller inside a case, a tank cover portion being formed on the case at a portion opposing the ink tank to swell in a similar figure, and a take-up operation knob being provided on an outer surface of the case with an interval large enough to enable an operation of the knob from an outer circumference of the tank cover portion and linked to the driving roller disposed within the case by penetrating through the case;
a carrier on which are mounted a print head to oppose a platen fixedly provided along a specific printing direction and the ribbon cassette for part of the ink ribbon to be positioned in a space between the print head and the platen, and which is configured to be able to reciprocate along a length direction of the platen; and
a medium feeding mechanism configured to feed a medium subject to printing into a space between the platen and the ink ribbon as well as the print head and then to move the medium in a direction orthogonal to a moving direction of the carrier in association with a movement of the carrier.
5. The printer according to claim 4, wherein:
a tip end of the operation knob provided on the outer surface of the case of the ribbon cassette is set to a height nearly equal to a height of a top surface of the tank cover.
6. The printer according to claim 4, wherein:
a tip end of the operation knob provided on the outer surface of the case of the ribbon cassette is set to a height lower than a height of a top surface of the tank cover.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A thermal fixing device comprising:
a fixing member disposed to be in contact with a fixation medium;
a pressuring member disposed to face the fixing member and configured to press the fixation medium against the fixing member;
a conveying unit configured to convey the fixation medium that has passed through between the fixing member and the pressuring member; and
a guide member configured to guide the fixation medium to the conveyance position;
wherein the conveyance unit comprises,
a first conveyance roller configured to convey the fixation medium, and configured to be in contact with the fixation medium on a surface that is opposite to a surface where the fixing roller contacts with at a position that is downstream of the fixing roller with respect to a conveyance direction of the fixation medium and is upstream of a conveyance position where the conveyance unit conveys the fixation medium; and
a plurality of second conveyance rollers disposed along the conveyance direction of the fixation medium, and each disposed to face the first conveyance roller to support and convey the fixation medium; and
wherein the guide member is disposed to face the first conveyance roller, and
a first (downstream) end portion of the guide member is disposed on a line that passes a contact portion between the first conveyance roller and an upstream side second conveyance roller and a second (upstream) end portion of the guide member, wherein the pressuring member comprises a plurality of the pressuring members disposed along the conveyance direction of the fixation medium.
2. The thermal fixing device as claimed in claim 1, wherein a part of the first conveyance roller is disposed on a line connecting the conveyance position and a contact portion where the fixing member contacts the pressuring member.
3. The thermal fixing device as claimed in claim 1, wherein the guide member is disposed along a direction of a line that intersects with a tangential line of the fixing member at a contact portion where the fixing member contacts the pressuring member.
4. The thermal fixing device as claimed in claim 1, wherein a contact portion of the first conveyance roller where the first conveyance roller contacts the fixation medium is made of elastic material, and
a contact portion of the guide member where the guide member contacts the fixation medium is made of metal material.
5. The thermal fixing device as claimed in claim 1, wherein a part of the first conveyance roller is disposed on a line connecting the conveyance position and a contact portion where the fixing member contacts the pressuring member.
6. The thermal fixing device as claimed in claim 5, wherein the pressuring member comprises a plurality of the pressuring members disposed along the conveyance direction of the fixation medium, and
wherein the line connecting the conveyance position and the contact portion corresponds to a line connecting a portion where the pressuring member that is disposed the most downstream contacts the fixing member and a portion where the first conveyance roller contacts to the second conveyance roller that is disposed the most upstream.
7. The thermal fixing device as claimed in claim 6, wherein the guide member is disposed along a direction of a line that intersects with a tangential line of the fixing member at a contact portion where the fixing member contacts the pressuring member, and
wherein the line that intersects with the tangential line corresponds to a line that intersects with a tangential line of the fixing member at a portion where the fixing member contacts the pressuring member that is disposed the most downstream.
8. The thermal fixing device as claimed in claim 1, wherein the guide member is disposed along a direction of a line that intersects with a tangential line of the fixing member at a contact portion where the fixing member contacts the pressuring member, and
wherein the line that intersects with the tangential line corresponds to a line that intersects with a tangential line of the fixing member at a portion where the fixing member contacts the pressuring member that is disposed the most downstream.
9. The thermal fixing device as claimed in claim 1, wherein the fixing member comprises a fixing roller, and
wherein the guide member is disposed away by not less than 5 mm downstream along a surface of the fixing roller from a contact portion where the fixing roller contacts the pressuring member that is disposed the most downstream, and is disposed along a line connecting a rotation center of the fixing roller and one end of the guide member which is facing the fixing roller.
10. The thermal fixing device as claimed in claim 1, wherein the fixing member comprises a fixing roller, and
wherein the guide member is disposed away by not less than 5 mm downstream along a surface of the fixing roller from a contact portion where the fixing roller contacts the pressuring member that is disposed the most downstream, and is disposed so that one end of the guide member is separated from the first conveyance roller with respect to a line connecting a rotation center of the fixing roller and the other end of the guide member which is facing the fixing roller.
11. An image forming apparatus comprising:
a sheet feeding section configured to feed a sheet; and
an image forming section configured to form an image on the sheet fed by the sheet feeding section,
wherein the image forming section includes a thermal fixing device comprising:
a fixing member disposed to be in contact with the sheet;
a pressuring member disposed to face the fixing member and configured to press the sheet against the fixing member;
a conveying unit configured to convey the sheet that has passed through between the fixing member and the pressuring member; and
a guide member disposed to face the first conveyance roller and configured to guide the sheet to the conveyance position;
wherein the conveyance unit comprises:
a first conveyance roller configured to convey the fixation medium, and configured to be in contact with the fixation medium on a surface that is opposite to a surface where the fixing roller contacts with at a position that is downstream of the fixing roller with respect to a conveyance direction of the fixation medium and is upstream of a conveyance position where the conveyance unit conveys the fixation medium; and
a plurality of second conveyance rollers disposed along the conveyance direction of the fixation medium, and each disposed to face the first conveyance roller to support and convey the fixation medium; and
wherein the guide member is disposed to face the first conveyance roller, and
a first (downstream) end portion of the guide member is disposed on a line that passes a contact portion between the first conveyance roller and an upstream side second conveyance roller and a second (upstream) end portion of the guide member, wherein the pressuring member comprises a plurality of the pressuring members disposed along the conveyance direction of the sheet.
12. The image forming apparatus as claimed in claim 11, wherein a part of the first conveyance roller is disposed on a line connecting the conveyance position and a contact portion where the fixing member contacts the pressuring member.
13. The image forming apparatus as claimed in claim 11, wherein a contact portion of the first conveyance roller where the first conveyance roller contacts the sheet is made of elastic material, and
a contact portion of the guide member where the guide member contacts the sheet is made of metal material.
14. The image forming apparatus as claimed in claim 11, wherein a part of the first conveyance roller is disposed on a line connecting the conveyance position and a contact portion where the fixing member contacts the pressuring member.
15. The image forming apparatus as claimed in claim 14, wherein the pressuring member comprises a plurality of the pressuring members disposed along the conveyance direction of the sheet, and
wherein the line connecting the conveyance position and the contact portion corresponds to a line connecting a portion where the pressuring member that is disposed the most downstream contacts the fixing member and a portion where the first conveyance roller contacts to the second conveyance roller that is disposed the most upstream.
16. The image forming apparatus as claimed in claim 15, wherein the guide member is disposed along a direction of a line that intersects with a tangential line of the fixing member at a contact portion where the fixing member contacts the pressuring member, and
wherein the line that intersects with the tangential line corresponds to a line that intersects with a tangential line of the fixing member at a portion where the fixing member contacts the pressuring member that is disposed the most downstream.
17. The image forming apparatus as claimed in claim 11, wherein the guide member is disposed along a direction of a line that intersects with a tangential line of the fixing member at a contact portion where the fixing member contacts the pressuring member, and
wherein the line that intersects with the tangential line corresponds to a line that intersects with a tangential line of the fixing member at a portion where the fixing member contacts the pressuring member that is disposed the most downstream.
18. The image forming apparatus as claimed in claim 11, wherein the fixing member comprises a fixing roller, and
wherein the guide member is disposed away by not less than 5 mm downstream along a surface of the fixing roller from a contact portion where the fixing roller contacts the pressuring member that is disposed the most downstream, and is disposed along a line connecting a rotation center of the fixing roller and one end of the guide member which is facing the fixing roller.
19. The image forming apparatus as claimed in claim 11, wherein the fixing member comprises a fixing roller, and
wherein the guide member is disposed away by not less than 5 mm downstream along a surface of the fixing roller from a contact portion where the fixing roller contacts the pressuring member that is disposed the most downstream, and is disposed so that one end of the guide member is separated from the first conveyance roller with respect to a line connecting a rotation center of the fixing roller and the other end of the guide member which is facing the fixing roller.
20. A thermal fixing device comprising:
a fixing member disposed to be in contact with a fixation medium;
a pressuring member disposed to face the fixing member and configured to press the fixation medium against the fixing member;
a conveying unit configured to convey the fixation medium that has passed through between the fixing member and the pressuring member; and
a guide member disposed configured to guide the fixation medium to the conveyance position;
wherein the conveyance unit comprises;
a first conveyance roller configured to convey the fixation medium, and configured to be in contact with the fixation medium on a surface that is opposite to a surface where the fixing member contacts with at a position that is downstream of the fixing member with respect to a conveyance direction of the fixation medium and is upstream of a conveyance position where the conveyance unit conveys the fixation medium; and
a plurality of second conveyance rollers disposed along the conveyance direction of the fixation medium, and each disposed to face the first conveyance roller to support and convey the fixation medium; and the guide member is disposed away by not less than 5 mm downstream along a surface of the fixing member from a contact portion where the fixing member contacts the pressuring member, and is disposed along a line connecting a rotation center of the fixing member and one end of the guide member which is facing the fixing member.
21. A thermal fixing device comprising:
a fixing member disposed to be in contact with a fixation medium;
a pressuring member disposed to face the fixing member and configured to press the fixation medium against the fixing member;
a conveying unit configured to convey the fixation medium that has passed through between the fixing member and the pressuring member; and
a guide member configured to guide the fixation medium to the conveyance position;
wherein the conveyance unit comprises:
a first conveyance roller configured to convey the fixation medium, and configured to be in contact with the fixation medium on a surface that is opposite to a surface where the fixing member contacts with at a position that is downstream of the fixing member with respect to a conveyance direction of the fixation medium and is upstream of a conveyance position where the conveyance unit conveys the fixation medium; and
a plurality of second conveyance rollers disposed along the conveyance direction of the fixation medium, and each disposed to face the first conveyance roller to support and convey the fixation medium; and
the guide member is disposed away by not less than 5 mm downstream along a surface of the fixing member from a contact portion where the fixing member contacts the pressuring member, and is disposed so that one end of the guide member is separated from the first conveyance roller with respect to a line connecting a rotation center of the fixing member and the other end of the guide member which is facing the fixing member.
22. A thermal fixing device comprising:
a fixing member disposed to be in contact with a fixation medium;
a pressuring member disposed to face the fixing member and configured to press the fixation medium against the fixing member;
a conveying unit configured to convey the fixation medium that has passed through between the fixing member and the pressuring member; and
a guide member configured to guide the fixation medium to the conveyance position;
wherein the conveyance unit comprises,
a first conveyance roller configured to convey the fixation medium, and configured to be in contact with the fixation medium on a surface that is opposite to a surface where the fixing roller contacts with at a position that is downstream of the fixing roller with respect to a conveyance direction of the fixation medium and is upstream of a conveyance position where the conveyance umt conveys the fixation medium; and
a plurality of second conveyance rollers disposed along the conveyance direction of the fixation medium, and each disposed to face the first conveyance roller to support and convey the fixation medium; and
wherein the guide member is disposed to face the first conveyance roller, and
a first (downstream) end portion of the guide member is disposed on a line that passes a contact portion between the first conveyance roller and an upstream side second conveyance roller and a second (upstream) end portion of the guide member, and wherein the fixing member comprises a fixing roller, and
wherein the guide member is disposed away by not less than 5 mm downstream along a surface of the fixing roller from a contact portion where the fixing roller contacts the pressuring member, and is disposed along a line connecting a rotation center of the fixing roller and one end of the guide member which is facing the fixing roller.
23. The thermal fixing device as claimed in claim 22, wherein the pressuring member comprises a plurality of the pressuring members disposed along the conveyance direction of the fixation medium.
24. The thermal fixing device as claimed in claim 23, wherein the guide member is disposed along a direction of a line that intersects with a tangential line of the fixing member at a contact portion where the fixing member contacts the pressuring member, and
wherein the line that intersects with the tangential line corresponds to a line that intersects with a tangential line of the fixing member at a portion where the fixing member contacts the pressuring member that is disposed the most downstream.
25. The thermal fixing device as claimed in claim 23, wherein the fixing member comprises a fixing roller, and
wherein the guide member is disposed away by not less than 5 mm downstream along a surface of the fixing roller from a contact portion where the fixing roller contacts the pressuring member that is disposed the most downstream, and is disposed along a line connecting a rotation center of the fixing roller and one end of the guide member which is facing the fixing roller.
26. The thermal fixing device as claimed in claim 23, wherein the fixing member comprises a fixing roller, and
wherein the guide member is disposed away by not less than 5 mm downstream along a surface of the fixing roller from a contact portion where the fixing roller contacts the pressuring member that is disposed the most downstream, and is disposed so that one end of the guide member is separated from the first conveyance roller with respect to a line connecting a rotation center of the fixing roller and the other end of the guide member which is facing the fixing roller.
27. The thermal fixing device as claimed in claim 22, wherein a part of the first conveyance roller is disposed on a line connecting the conveyance position and a contact portion where the fixing member contacts the pressuring member.
28. The thermal fixing device as claimed in claim 22, wherein the guide member is disposed along a direction of a line that intersects with a tangential line of the fixing member at a contact portion where the fixing member contacts the pressuring member.
29. The thermal fixing device as claimed in claim 22, wherein a dynamic friction coefficient of the first conveyance roller at a contact portion where the first conveyance roller contacts the fixation medium is larger than a dynamic friction coefficient of the guide member at a contact portion where the guide member contacts the fixation medium.
30. The thermal fixing device as claimed in claim 22, wherein a contact portion of the first conveyance roller where the first conveyance roller contacts the fixation medium is made of elastic material, and
a contact portion of the guide member where the guide member contacts the fixation medium is made of metal material.
31. The thermal fixing device as claimed in claim 22, wherein a part of the first conveyance roller is disposed on a line connecting the conveyance position and a contact portion where the fixing member contacts the pressuring member.
32. The thermal fixing device as claimed in claim 31, wherein the pressuring member comprises a plurality of the pressuring members disposed along the conveyance direction of the fixation medium, and
wherein the line connecting the conveyance position and the contact portion corresponds to a line connecting a portion where the pressuring member that is disposed the most downstream contacts the fixing member and a portion where the first conveyance roller contacts to the second conveyance roller that is disposed the most upstream.
33. The thermal fixing device as claimed in claim 32, wherein the guide member is disposed along a direction of a line that intersects with a tangential line of the fixing member at a contact portion where the fixing member contacts the pressuring member, and
wherein the line that intersects with the tangential line corresponds to a line that intersects with a tangential line of the fixing member at a portion where the fixing member contacts the pressuring member that is disposed the most downstream.
34. A thermal fixing device comprising:
a fixing member disposed to be in contact with a fixation medium;
a pressuring member disposed to face the fixing member and configured to press the fixation medium against the fixing member;
a conveying unit configured to convey the fixation medium that has passed through between the fixing member and the pressuring member; and
a guide member configured to guide the fixation medium to the conveyance position;
wherein the conveyance unit comprises,
a first conveyance roller configured to convey the fixation medium, and configured to be in contact with the fixation medium on a surface that is opposite to a surface where the fixing roller contacts with at a position that is downstream of the fixing roller with respect to a conveyance direction of the fixation medium and is upstream of a conveyance position where the conveyance unit conveys the fixation medium; and
a plurality of second conveyance rollers disposed along the conveyance direction of the fixation medium, and each disposed to face the first conveyance roller to support and convey the fixation medium; and
wherein the guide member is disposed to face the first conveyance roller, and
a first (downstream) end portion of the guide member is disposed on a line that passes a contact portion between the first conveyance roller and an upstream side second conveyance roller and a second (upstream) end portion of the guide member, and wherein the fixing member comprises a fixing roller, and
wherein the guide member is disposed away by not less than 5 mm downstream along a surface of the fixing roller from a contact portion where the fixing roller contacts the pressuring member, and is disposed so that one end of the guide member is separated from the first conveyance roller with respect to a line connecting a rotation center of the fixing roller and the other end of the guide member which is facing the fixing roller.
35. The thermal fixing device as claimed in claim 34, wherein the pressuring member comprises a plurality of the pressuring members disposed along the conveyance direction of the fixation medium.
36. The thermal fixing device as claimed in claim 35, wherein the guide member is disposed along a direction of a line that intersects with a tangential line of the fixing member at a contact portion where the fixing member contacts the pressuring member, and
wherein the line that intersects with the tangential line corresponds to a line that intersects with a tangential line of the fixing member at a portion where the fixing member contacts the pressuring member that is disposed the most downstream.
37. The thermal fixing device as claimed in claim 35, wherein the fixing member comprises a fixing roller, and
wherein the guide member is disposed away by not less than 5 mm downstream along a surface of the fixing roller from a contact portion where the fixing roller contacts the pressuring member that is disposed the most downstream, and is disposed along a line connecting a rotation center of the fixing roller and one end of the guide member which is facing the fixing roller.
38. The thermal fixing device as claimed in claim 35, wherein the fixing member comprises a fixing roller, and
wherein the guide member is disposed away by not less than 5 mm downstream along a surface of the fixing roller from a contact portion where the fixing roller contacts the pressuring member that is disposed the most downstream, and is disposed so that one end of the guide member is separated from the first conveyance roller with respect to a line connecting a rotation center of the fixing roller and the other end of the guide member which is facing the fixing roller.
39. The thermal fixing device as claimed in claim 34, wherein a part of the first conveyance roller is disposed on a line connecting the conveyance position and a contact portion where the fixing member contacts the pressuring member.
40. The thermal fixing device as claimed in claim 34, wherein the guide member is disposed along a direction of a line that intersects with a tangential line of the fixing member at a contact portion where the fixing member contacts the pressuring member.
41. The thermal fixing device as claimed in claim 34, wherein a dynamic friction coefficient of the first conveyance roller at a contact portion where the first conveyance roller contacts the fixation medium is larger than a dynamic friction coefficient of the guide member at a contact portion where the guide member contacts the fixation medium.
42. The thermal fixing device as claimed in claim 34, wherein a contact portion of the first conveyance roller where the first conveyance roller contacts the fixation medium is made of elastic material, and
a contact portion of the guide member where the guide member contacts the fixation medium is made of metal material.
43. The thermal fixing device as claimed in claim 34, wherein a part of the first conveyance roller is disposed on a line connecting the conveyance position and a contact portion where the fixing member contacts the pressuring member.
44. The thermal fixing device as claimed in claim 43, wherein the pressuring member comprises a plurality of the pressuring members disposed along the conveyance direction of the fixation medium, and
wherein the line connecting the conveyance position and the contact portion corresponds to a line connecting a portion where the pressuring member that is disposed the most downstream contacts the fixing member and a portion where the first conveyance roller contacts to the second conveyance roller that is disposed the most upstream.
45. The thermal fixing device as claimed in claim 44, wherein the guide member is disposed along a direction of a line that intersects with a tangential line of the fixing member at a contact portion where the fixing member contacts the pressuring member, and
wherein the line that intersects with the tangential line corresponds to a line that intersects with a tangential line of the fixing member at a portion where the fixing member contacts the pressuring member that is disposed the most downstream.
46. A thermal fixing device comprising:
a fixing member disposed to be in contact with a fixation medium;
a pressuring member disposed to face the fixing member and configured to press the fixation medium against the fixing member;
a conveying unit configured to convey the fixation medium that has passed through between the fixing member and the pressuring member; and
a guide member configured to guide the fixation medium to the conveyance position;
wherein the conveyance unit comprises,
a first conveyance roller configured to convey the fixation medium, and configured to be in contact with the fixation medium on a surface that is opposite to a surface where the fixing roller contacts with at a position that is downstream of the fixing roller with respect to a conveyance direction of the fixation medium and is upstream of a conveyance position where the conveyance umt conveys the fixation medium; and
a plurality of second conveyance rollers disposed along the conveyance direction of the fixation medium, and each disposed to face the first conveyance roller to support and convey the fixation medium; and
wherein the guide member is disposed to face the first conveyance roller, and
a first (downstream) end portion of the guide member is disposed on a line that passes a contact portion between the first conveyance roller and an upstream side second conveyance roller and a second (upstream) end portion of the guide member.
47. The thermal fixing device as claimed in claim 46, wherein the pressuring member comprises a plurality of the pressuring members disposed along the conveyance direction of the fixation medium.
48. The thermal fixing device as claimed in claim 47, wherein the guide member is disposed along a direction of a line that intersects with a tangential line of the fixing member at a contact portion where the fixing member contacts the pressuring member, and
wherein the line that intersects with the tangential line corresponds to a line that intersects with a tangential line of the fixing member at a portion where the fixing member contacts the pressuring member that is disposed the most downstream.
49. The thermal fixing device as claimed in claim 47, wherein the fixing member comprises a fixing roller, and
wherein the guide member is disposed away by not less than 5 mm downstream along a surface of the fixing roller from a contact portion where the fixing roller contacts the pressuring member that is disposed the most downstream, and is disposed along a line connecting a rotation center of the fixing roller and one end of the guide member which is facing the fixing roller.
50. The thermal fixing device as claimed in claim 47, wherein the fixing member comprises a fixing roller, and
wherein the guide member is disposed away by not less than 5 mm downstream along a surface of the fixing roller from a contact portion where the fixing roller contacts the pressuring member that is disposed the most downstream, and is disposed so that one end of the guide member is separated from the first conveyance roller with respect to a line connecting a rotation center of the fixing roller and the other end of the guide member which is facing the fixing roller.
51. The thermal fixing device as claimed in claim 46, wherein a part of the first conveyance roller is disposed on a line connecting the conveyance position and a contact portion where the fixing member contacts the pressuring member.
52. The thermal fixing device as claimed in claim 46, wherein the guide member is disposed along a direction of a line that intersects with a tangential line of the fixing member at a contact portion where the fixing member contacts the pressuring member.
53. The thermal fixing device as claimed in claim 46, wherein the fixing member comprises a fixing roller, and
wherein the guide member is disposed away by not less than 5 mm downstream along a surface of the fixing roller from a contact portion where the fixing roller contacts the pressuring member, and is disposed along a line connecting a rotation center of the fixing roller and one end of the guide member which is facing the fixing roller.
54. The thermal fixing device as claimed in claim 46, wherein the fixing member comprises a fixing roller, and
wherein the guide member is disposed away by not less than 5 mm downstream along a surface of the fixing roller from a contact portion where the fixing roller contacts the pressuring member, and is disposed so that one end of the guide member is separated from the first conveyance roller with respect to a line connecting a rotation center of the fixing roller and the other end of the guide member which is facing the fixing roller.
55. The thermal fixing device as claimed in claim 46, wherein a contact portion of the first conveyance roller where the first conveyance roller contacts the fixation medium is made of elastic material, and
a contact portion of the guide member where the guide member contacts the fixation medium is made of metal material.
56. The thermal fixing device as claimed in claim 46, wherein a part of the first conveyance roller is disposed on a line connecting the conveyance position and a contact portion where the fixing member contacts the pressuring member.
57. The thermal fixing device as claimed in claim 56, wherein the pressuring member comprises a plurality of the pressuring members disposed along the conveyance direction of the fixation medium, and
wherein the line connecting the conveyance position and the contact portion corresponds to a line connecting a portion where the pressuring member that is disposed the most downstream contacts the fixing member and a portion where the first conveyance roller contacts to the second conveyance roller that is disposed the most upstream.
58. The thermal fixing device as claimed in claim 57, wherein the guide member is disposed along a direction of a line that intersects with a tangential line of the fixing member at a contact portion where the fixing member contacts the pressuring member, and
wherein the line that intersects with the tangential line corresponds to a line that intersects with a tangential line of the fixing member at a portion where the fixing member contacts the pressuring member that is disposed the most downstream.
59. A thermal fixing device comprising:
a fixing member disposed to be in contact with a fixation medium;
a pressuring member disposed to face the fixing member and configured to press the fixation medium against the fixing member;
a conveying unit configured to convey the fixation medium that has passed through between the fixing member and the pressuring member; and
a guide member configured to guide the fixation medium to the conveyance position;
wherein the conveyance unit comprises,
a first conveyance roller configured to convey the fixation medium, and configured to be in contact with the fixation medium on a surface that is opposite to a surface where the fixing roller contacts with at a position that is downstream of the fixing roller with respect to a conveyance direction of the fixation medium and is upstream of a conveyance position where the conveyance unit conveys the fixation medium; and
a plurality of second conveyance rollers disposed along the conveyance direction of the fixation medium, and each disposed to face the first conveyance roller to support and convey the fixation medium; and
wherein the guide member is disposed to face the first conveyance roller, and
a first (downstream) end portion of the guide member is disposed on a line that passes a contact portion between the first conveyance roller and an upstream side second conveyance roller and a second (upstream) end portion of the guide member, and wherein a contact portion of the first conveyance roller where the first conveyance roller contacts the fixation medium is made of elastic material, and
a contact portion of the guide member where the guide member contacts the fixation medium is made of metal material.
60. An image forming apparatus comprising:
a sheet feeding section configured to feed a sheet; and
an image forming section configured to form an image on the sheet fed by the sheet feeding section,
wherein the image forming section includes a thermal fixing device comprising:
a fixing member disposed to be in contact with the sheet;
a pressuring member disposed to face the fixing member and configured to press the sheet against the fixing member;
a conveying unit configured to convey the sheet that has passed through between the fixing member and the pressuring member; and
a guide member disposed to face the first conveyance roller and configured to guide the sheet to the conveyance position;
wherein the conveyance unit comprises:
a first conveyance roller configured to convey the fixation medium, and configured to be in contact with the fixation medium on a surface that is opposite to a surface where the fixing roller contacts with at a position that is downstream of the fixing roller with respect to a conveyance direction of the fixation medium and is upstream of a conveyance position where the conveyance unit conveys the fixation medium; and
a plurality of second conveyance rollers disposed along the conveyance direction of the fixation medium, and each disposed to face the first conveyance roller to support and convey the fixation medium; and
wherein the guide member is disposed to face the first conveyance roller, and
a first (downstream) end portion of the guide member is disposed on a line that passes a contact portion between the first conveyance roller and an upstream side second conveyance roller and a second (upstream) end portion of the guide member, wherein the fixing member comprises a fixing roller, and
wherein the guide member is disposed away by not less than 5 mm downstream along a surface of the fixing roller from a contact portion where the fixing roller contacts the pressuring member, and is disposed along a line connecting a rotation center of the fixing roller and one end of the guide member which is facing the fixing roller.
61. The image forming apparatus as claimed in claim 60, wherein the pressuring member comprises a plurality of the pressuring members disposed along the conveyance direction of the sheet.
62. The image forming apparatus as claimed in claim 61, wherein the guide member is disposed along a direction of a line that intersects with a tangential line of the fixing member at a contact portion where the fixing member contacts the pressuring member, and
wherein the line that intersects with the tangential line corresponds to a line that intersects with a tangential line of the fixing member at a portion where the fixing member contacts the pressuring member that is disposed the most downstream.
63. The image forming apparatus as claimed in claim 61, wherein the fixing member comprises a fixing roller, and
wherein the guide member is disposed away by not less than 5 mm downstream along a surface of the fixing roller from a contact portion where the fixing roller contacts the pressuring member that is disposed the most downstream, and is disposed along a line connecting a rotation center of the fixing roller and one end of the guide member which is facing the fixing roller.
64. The image fonning apparatus as claimed in claim 61, wherein the fixing member comprises a fixing roller, and
wherein the guide member is disposed away by not less than 5 mm downstream along a surface of the fixing roller from a contact portion where the fixing roller contacts the pressuring member that is disposed the most downstream, and is disposed so that one end of the guide member is separated from the first conveyance roller with respect to a line connecting a rotation center of the fixing roller and the other end of the guide member which is facing the fixing roller.
65. The image forming apparatus as claimed in claim 60, wherein a part of the first conveyance roller is disposed on a line connecting the conveyance position and a contact portion where the fixing member contacts the pressuring member.
66. The image forming apparatus as claimed in claim 60, wherein the guide member is disposed along a direction of a line that intersects with a tangential line of the fixing member at a contact portion where the fixing member contacts the pressuring member.
67. The image forming apparatus as claimed in claim 60, wherein a dynamic friction coefficient of the first conveyance roller at a contact portion where the first conveyance roller contacts the sheet is larger than a dynamic friction coefficient of the guide member at a contact portion where the guide member contacts the sheet.
68. The image forming apparatus as claimed in claim 60, wherein a contact portion of the first conveyance roller where the first conveyance roller contacts the sheet is made of elastic material, and
a contact portion of the guide member where the guide member contacts the sheet is made of metal material.
69. The image forming apparatus as claimed in claim 60, wherein a part of the first conveyance roller is disposed on a line connecting the conveyance position and a contact portion where the fixing member contacts the pressuring member.
70. The image forming apparatus as claimed in claim 69, wherein the pressuring member comprises a plurality of the pressuring members disposed along the conveyance direction of the sheet, and
wherein the line connecting the conveyance position and the contact portion corresponds to a line connecting a portion where the pressuring member that is disposed the most downstream contacts the fixing member and a portion where the first conveyance roller contacts to the second conveyance roller that is disposed the most upstream.
71. The image forming apparatus as claimed in claim 70, wherein the guide member is disposed along a direction of a line that intersects with a tangential line of the fixing member at a contact portion where the fixing member contacts the pressuring member, and
wherein the line that intersects with the tangential line corresponds to a line that intersects with a tangential line of the fixing member at a portion where the fixing member contacts the pressuring member that is disposed the most downstream.
72. An image forming apparatus comprising:
a sheet feeding section configured to feed a sheet; and
an image forming section configured to form an image on the sheet fed by the sheet feeding section,
wherein the image forming section includes a thermal fixing device comprising:
a fixing member disposed to be in contact with the sheet;
a pressuring member disposed to face the fixing member and configured to press the sheet against the fixing member;
a conveying unit configured to convey the sheet that has passed through between the fixing member and the pressuring member; and
a guide member disposed to face the first conveyance roller and configured to guide the sheet to the conveyance position;
wherein the conveyance unit comprises:
a first conveyance roller configured to convey the fixation medium, and configured to be in contact with the fixation medium on a surface that is opposite to a surface where the fixing roller contacts with at a position that is downstream of the fixing roller with respect to a conveyance direction of the fixation medium and is upstream of a conveyance position where the conveyance unit conveys the fixation medium; and
a plurality of second conveyance rollers disposed along the conveyance direction of the fixation medium, and each disposed to face the first conveyance roller to support and convey the fixation medium; and
wherein the guide member is disposed to face the first conveyance roller, and
a first (downstream) end portion of the guide member is disposed on a line that passes a contact portion between the first conveyance roller and an upstream side second conveyance roller and a second (upstream) end portion of the guide member, wherein the fixing member comprises a fixing roller, and
wherein the guide member is disposed away by not less than 5 mm downstream along a surface of the fixing roller from a contact portion where the fixing roller contacts the pressuring member, and is disposed so that one end of the guide member is separated from the first conveyance roller with respect to a line connecting a rotation center of the fixing roller and the other end of the guide member which is facing the fixing roller.
73. The image forming apparatus as claimed in claim 72, wherein the fixing member comprises a fixing roller, and
wherein the guide member is disposed away by not less than 5 mm downstream along a surface of the fixing roller from a contact portion where the fixing roller contacts the pressuring member, and is disposed so that one end of the guide member is separated from the first conveyance roller with respect to a line connecting a rotation center of the fixing roller and the other end of the guide member which is facing the fixing roller.
74. The image forming apparatus as claimed in claim 73, wherein the guide member is disposed along a direction of a line that intersects with a tangential line of the fixing member at a contact portion where the fixing member contacts the pressuring member, and
wherein the line that intersects with the tangential line corresponds to a line that intersects with a tangential line of the fixing member at a portion where the fixing member contacts the pressuring member that is disposed the most downstream.
75. The image forming apparatus as claimed in claim 73, wherein the fixing member comprises a fixing roller, and
wherein the guide member is disposed away by not less than 5 mm downstream along a surface of the fixing roller from a contact portion where the fixing roller contacts the pressuring member that is disposed the most downstream, and is disposed along a line connecting a rotation center of the fixing roller and one end of the guide member which is facing the fixing roller.
76. The image forming apparatus as claimed in claim 73, wherein the fixing member comprises a fixing roller, and
wherein the guide member is disposed away by not less than 5 mm downstream along a surface of the fixing roller from a contact portion where the fixing roller contacts the pressuring member that is disposed the most downstream, and is disposed so that one end of the guide member is separated from the first conveyance roller with respect to a line connecting a rotation center of the fixing roller and the other end of the guide member which is facing the fixing roller.
77. The image forming apparatus as claimed in claim 72, wherein a part of the first conveyance roller is disposed on a line connecting the conveyance position and a contact portion where the fixing member contacts the pressuring member.
78. The image forming apparatus as claimed in claim 72, wherein the guide member is disposed along a direction of a line that intersects with a tangential line of the fixing member at a contact portion where the fixing member contacts the pressuring member.
79. The image forming apparatus as claimed in claim 72, wherein a dynamic friction coefficient of the first conveyance roller at a contact portion where the first conveyance roller contacts the sheet is larger than a dynamic friction coefficient of the guide member at a contact portion where the guide member contacts the sheet.
80. The image forming apparatus as claimed in claim 72, wherein a contact portion of the first conveyance roller where the first conveyance roller contacts the sheet is made of elastic material, and
a contact portion of the guide member where the guide member contacts the sheet is made of metal material.
81. The image forming apparatus as claimed in claim 72, wherein a part of the first conveyance roller is disposed on a line connecting the conveyance position and a contact portion where the fixing member contacts the pressuring member.
82. The image forming apparatus as claimed in claim 81, wherein the pressuring member comprises a plurality of the pressuring members disposed along the conveyance direction of the sheet, and
wherein the line connecting the conveyance position and the contact portion corresponds to a line connecting a portion where the pressuring member that is disposed the most downstream contacts the fixing member and a portion where the first conveyance roller contacts to the second conveyance roller that is disposed the most upstream.
83. The image forming apparatus as claimed in claim 81, wherein the guide member is disposed along a direction of a line that intersects with a tangential line of the fixing member at a contact portion where the fixing member contacts the pressuring member, and
wherein the line that intersects with the tangential line corresponds to a line that intersects with a tangential line of the fixing member at a portion where the fixing member contacts the pressuring member that is disposed the most downstream.
84. An image forming apparatus comprising:
a sheet feeding section configured to feed a sheet; and
an image forming section configured to form an image on the sheet fed by the sheet feeding section,
wherein the image forming section includes a thermal fixing device comprising:
a fixing member disposed to be in contact with the sheet;
a pressuring member disposed to face the fixing member and configured to press the sheet against the fixing member;
a conveying unit configured to convey the sheet that has passed through between the fixing member and the pressuring member; and
a guide member disposed to face the first conveyance roller and configured to guide the sheet to the conveyance position;
wherein the conveyance unit comprises:
a first conveyance roller configured to convey the fixation medium, and configured to be in contact with the fixation medium on a surface that is opposite to a surface where the fixing roller contacts with at a position that is downstream of the fixing roller with respect to a conveyance direction of the fixation medium and is upstream of a conveyance position where the conveyance unit conveys the fixation medium; and
a plurality of second conveyance rollers disposed along the conveyance direction of the fixation medium, and each disposed to face the first conveyance roller to support and convey the fixation medium; and
wherein the guide member is disposed to face the first conveyance roller, and
a first (downstream) end portion of the guide member is disposed on a line that passes a contact portion between the first conveyance roller and an upstream side second conveyance roller and a second (upstream) end portion of the guide member, wherein a dynamic friction coefficient of the first conveyance roller at a contact portion where the first conveyance roller contacts the sheet is larger than a dynamic friction coefficient of the guide member at a contact portion where the guide member contacts the sheet.
85. The image forming apparatus as claimed in claim 84, wherein the pressuring member comprises a plurality of the pressuring members disposed along the conveyance direction of the sheet.
86. The image forming apparatus as claimed in claim 85, wherein the guide member is disposed along a direction of a line that intersects with a tangential line of the fixing member at a contact portion where the fixing member contacts the pressuring member, and
wherein the line that intersects with the tangential line corresponds to a line that intersects with a tangential line of the fixing member at a portion where the fixing member contacts the pressuring member that is disposed the most downstream.
87. The image forming apparatus as claimed in claim 85, wherein the fixing member comprises a fixing roller, and
wherein the guide member is disposed away by not less than 5 mm downstream along a surface of the fixing roller from a contact portion where the fixing roller contacts the pressuring member that is disposed the most downstream, and is disposed along a line connecting a rotation center of the fixing roller and one end of the guide member which is facing the fixing roller.
88. The image forming apparatus as claimed in claim 85, wherein the fixing member comprises a fixing roller, and
wherein the guide member is disposed away by not less than 5 mm downstream along a surface of the fixing roller from a contact portion where the fixing roller contacts the pressuring member that is disposed the most downstream, and is disposed so that one end of the guide member is separated from the first conveyance roller with respect to a line connecting a rotation center of the fixing roller and the other end of the guide member which is facing the fixing roller.
89. The image forming apparatus as claimed in claim 84, wherein a part of the first conveyance roller is disposed on a line connecting the conveyance position and a contact portion where the fixing member contacts the pressuring member.
90. The image forming apparatus as claimed in claim 84, wherein the guide member is disposed along a direction of a line that intersects with a tangential line of the fixing member at a contact portion where the fixing member contacts the pressuring member.
91. The image forming apparatus as claimed in claim 84, wherein the fixing member comprises a fixing roller, and
wherein the guide member is disposed away by not less than 5 mm downstream along a surface of the fixing roller from a contact portion where the fixing roller contacts the pressuring member, and is disposed along a line connecting a rotation center of the fixing roller and one end of the guide member which is facing the fixing roller.
92. The image forming apparatus as claimed in claim 84, wherein the fixing member comprises a fixing roller, and
wherein the guide member is disposed away by not less than 5 mm downstream along a surface of the fixing roller from a contact portion where the fixing roller contacts the pressuring member, and is disposed so that one end of the guide member is separated from the first conveyance roller with respect to a line connecting a rotation center of the fixing roller and the other end of the guide member which is facing the fixing roller.
93. The image forming apparatus as claimed in claim 84, wherein a contact portion of the first conveyance roller where the first conveyance roller contacts the sheet is made of elastic material, and
a contact portion of the guide member where the guide member contacts the sheet is made of metal material.
94. The image forming apparatus as claimed in claim 84, wherein a part of the first conveyance roller is disposed on a line connecting the conveyance position and a contact portion where the fixing member contacts the pressuring member.
95. The image forming apparatus as claimed in claim 94, wherein the pressuring member comprises a plurality of the pressuring members disposed along the conveyance direction of the sheet, and
wherein the line connecting the conveyance position and the contact portion corresponds to a line connecting a portion where the pressuring member that is disposed the most downstream contacts the fixing member and a portion where the first conveyance roller contacts to the second conveyance roller that is disposed the most upstream.
96. The image forming apparatus as claimed in claim 95, wherein the guide member is disposed along a direction of a line that intersects with a tangential line of the fixing member at a contact portion where the fixing member contacts the pressuring member, and
wherein the line that intersects with the tangential line corresponds to a line that intersects with a tangential line of the fixing member at a portion where the fixing member contacts the pressuring member that is disposed the most downstream.
97. An image forming apparatus comprising:
a sheet feeding section configured to feed a sheet; and
an image forming section configured to form an image on the sheet fed by the sheet feeding section,
wherein the image forming section includes a thermal fixing device comprising:
a fixing member disposed to be in contact with the sheet;
a pressuring member disposed to face the fixing member and configured to press the sheet against the fixing member;
a conveying unit configured to convey the sheet that has passed through between the fixing member and the pressuring member; and
a guide member disposed to face the first conveyance roller and configured to guide the sheet to the conveyance position;
wherein the conveyance unit comprises:
a first conveyance roller configured to convey the fixation medium, and configured to be in contact with the fixation medium on a surface that is opposite to a surface where the fixing roller contacts with at a position that is downstream of the fixing roller with respect to a conveyance direction of the fixation medium and is upstream of a conveyance position where the conveyance unit conveys the fixation medium; and
a plurality of second conveyance rollers disposed along the conveyance direction of the fixation medium, and each disposed to face the first conveyance roller to support and convey the fixation medium; and
wherein the guide member is disposed to face the first conveyance roller, and
a first (downstream) end portion of the guide member is disposed on a line that passes a contact portion between the first conveyance roller and an upstream side second conveyance roller and a second (upstream) end portion of the guide member, wherein a contact portion of the first conveyance roller where the first conveyance roller contacts the sheet is made of elastic material, and
a contact portion of the guide member where the guide member contacts the sheet is made of metal material.