1. An image processing apparatus capable of communicating with an image forming unit that forms an image on a recording material based on a video signal, comprising:
a detection unit configured to detect a synchronization signal output from the image forming unit and indicative of timing with which the video signal is output to the image forming unit;
a setting unit configured to set an enable signal to high or low in such a manner that the enable signal is set to high based on the detection unit detecting the synchronization signal and the enable signal is set to low based on a predetermined time period elapsing after the detection unit detects the synchronization signal;
a first video signal output unit configured to output, if the detection unit detects the synchronization signal during the enable signal being set to low, a video signal for use in forming a first type image to the image forming unit; and
a second video signal output unit configured to output, if the detection unit detects the synchronization signal during the enable signal being set to high, a video signal for use in forming a second type image to the image forming unit.
2. The image processing apparatus according to claim 1, wherein the first video signal output unit outputs the video signal for use in forming the first type image to the image forming unit with a timing which is determined on a basis of a detection timing of the synchronization signal detected by the detection unit.
3. The image processing apparatus according to claim 2, wherein the second video signal output unit outputs the video signal for use in forming the second type image to the image forming unit with a timing which is determined on a basis of a detection timing of the synchronization signal detected by the detection unit.
4. The image processing apparatus according to claim 1,
wherein the first video signal output unit outputs the video signal to the image forming unit, and the image forming unit forms the first type image as an image which is to be printed on a recording medium, and
wherein the second video signal output unit outputs the video signal to the image forming unit, and the image forming unit forms the second type image as an image which is not to be printed on a recording medium and used for a maintenance of the image forming unit.
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 scroll compressor comprising:
a first scroll member having a base and a generally spiral wrap extending from said base, and a second scroll member having a base and a generally spiral wrap extending from said base, said wraps of said first and second scroll members interfitting to define a pair of parallel compression chambers, said second scroll member driven to orbit relative to the first scroll member; and
at least two spaced grooves formed in one of said first and second scroll members, and at least one recess formed in the other of said first and second scroll members, said recess bridging a space between said spaced grooves as said wrap of said second scroll member orbits relative to said first scroll member to selectively communicate refrigerant between said pair of compression chambers, and equalize pressure in said pair of compression chambers.
2. The scroll compressor as recited in claim 1, wherein said recess is formed in a wrap tip of said other of said first and second scroll members.
3. The scroll compressor as recited in claim 1, wherein said recess is generally circular.
4. The scroll compressor as recited in claim 1, wherein said spaced grooves include at least one elongated groove.
5. The scroll compressor as recited in claim 1, wherein said scroll compressor is provided with at least one injection port for injecting an intermediate pressure fluid.
6. The scroll compressor as recited in claim 5, wherein said intermediate pressure fluid is generally liquid.
7. The scroll compressor as recited in claim 5, wherein said intermediate pressure fluid is generally vapor.
8. The scroll compressor as recited in claim 5, wherein said intermediate pressure fluid is a combination of liquid and vapor.
9. The scroll compressor as recited in claim 5, wherein said injection port is an economizer injection port.
10. The scroll compressor as recited in claim 5, wherein said injection port is a liquid injection port.
11. The scroll compressor as recited in claim 1, wherein at least one said wrap has a non-uniform thickness.
12. A scroll compressor comprising:
a first scroll member having a base and a generally spiral wrap extending from said base, and a second scroll member having a base and a generally spiral wrap extending from said base, said wraps of said first and second scroll members interfitting to define a pair of parallel compression chambers, said second scroll member driven to orbit relative to said first scroll member;
two spaced grooves formed in said base of said first scroll member, and a recess formed in the wrap tip of said second scroll member, said recess bridging a space between said two spaced grooves as the wrap of said second scroll member orbits relative to said first scroll member, and the bridging selectively communicating refrigerant between said pair of compression chambers to equalize pressure in said pair of compression chambers; and
injection ports for injecting an intermediate pressure fluid into each of said pair of compression chambers from an economizer cycle.
13. The scroll compressor as recited in claim 12, wherein said bridging recess is generally circular.
14. The scroll compressor as recited in claim 12, wherein said two grooves include at least one elongated groove and one smaller groove.