1. An electric hammer, comprising:
a housing having a nozzle portion;
a motor and a transmission mechanism arranged in the housing;
a striking device, coupled to the motor and the transmission mechanism, arranged to move in a reciprocating manner in the nozzle portion; and
a clamping device mounted to the nozzle portion and at least partially extending out of the nozzle portion, wherein the clamping device includes an outer sleeve, an inner sleeve arranged in the outer sleeve, and at least two clamping members arranged on the inner sleeve, wherein the inner sleeve has a first position and a second position with respect to the outer sleeve, and the distance between the two clamping members in the first position is less than that between the two clamping members in the second position and
wherein the clamping device further comprises a connecting member with one end fixedly connected to the inner sleeve and the other end having a movable connecting portion which is connected to the housing.
2. The electric hammer according to claim 1, wherein the distance between the front end surface of the inner sleeve and the front end surface of the outer sleeve in the first position is larger than the distance between the front end surface of the inner sleeve and the front end surface of the outer sleeve in the second position.
3. The electric hammer according to claim 1, wherein a clamping groove is formed in the housing and the movable connecting portion is an elastic warped piece which is engaged into the clamping groove.
4. The electric hammer according to claim 1, wherein a clamping groove is formed in the housing and the movable connecting portion includes a sliding groove with a spring arranged therein and a wedge block arranged on the spring engaged into the clamping groove and partially extending out of the top end of the sliding groove.
5. The electric hammer according to claim 1, wherein the outer sleeve is provided with inclining grooves inclined with respect to an axis of the striking device and wherein the clamping members are connected into the inclining grooves.
6. The electric hammer according to claim 5, wherein the inner sleeve is provided with straight grooves vertical to the axis of the striking device and wherein the clamping members are connected into the inclining grooves and the straight grooves simultaneously.
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 method of making a heat-sensitive lithographic printing plate precursor comprising the steps of
(i) providing a web of a lithographic support having a hydrophilic surface;
(ii) applying a coating comprising a phenolic resin on the hydrophilic surface of the web;
(iii) drying the coating by supplying heat to the coated web;
(iv) an active cooling step wherein the web temperature is reduced at an average cooling rate which is higher than if the web would be kept under ambient conditions and varies between 0.5 and 30\xb0 C.s; and
(v) winding the precursor on a core or cutting the precursor into sheets.
2. The meted according to claim 1 wherein the average cooling rate is not higher than 20\xb0 C.s.
3. The method according to claim 2 further comprising a heating step between step (iii) and step (iv), wherein during said heating step the web temperature is maintained above the glass transition temperature of the phenolic resin during a period of between 0.1 and 60 seconds.
4. The method according to claim 3 wherein during the cooling step the web temperature is reduced
in a first phase down to T1 at an average cooling rate of at least 10\xb0 C.s; and
in a second phase from T1 to T2 at an average cooling rate which is lower than 10\xb0 C.s.
5. The method according to claim 3 wherein dining the cooling step the web temperature is reduced
in a first phase dawn to T1 at an average cooling rate of at least 10\xb0 C.s; and
in a second phase from T1 to T2 at an average cooling rate which is lower than 10\xb0 C.s; and
in a third phase from T2 to about ambient temperature at an average cooling rate of at least 10\xb0 C.s.
6. The method according to claim 1 wherein the average cooling rate is not higher than 10\xb0C.s.
7. The method according to claim 6 further comprising a heating step between step (iii) and step (iv), wherein during said heating step the web temperature is maintained above the glass transition temperature of the phenolic resin during a period of between 0.1 and 60 seconds.
8. The method according to claim 7 wherein during the cooling step the web temperature is reduced
in a first phase down to T1 at an average cooling rate of at least 10\xb0 C.s; and
in a second phase from T1 to T2 at an avenge cooling rate which is lower than 10\xb0 C.s.
9. The method according to claim 7 wherein during the cooling step the web temperature is reduced
in a first phase down to T1 at an avenge cooling rate of at least 10\xb0 C.s; and
in a second phase from T1 to T2 at an average cooling rate which is lower than 10\xb0 C.s; and
in a third phase from T2 to about ambient temperature at an average cooling rate of at least 10\xb0 C.s.
10. The method according to claim 1 wherein at the beginning of the cooling step the web temperature is higher than Tg, the glass transition temperature of the coating comprising the phenolic resin, and wherein during the cooling step the web temperature is reduced from T1 to T2, T1 being higher than Tg and T2 being lower than Tg, at an average cooling rate which is lower than 10\xb0 C.s.
11. The method according to claim 10 wherein during the cooling step the web temperature is reduced
in a first phase down to T1 at an average cooling rate of at least 10\xb0 C.s; and
in a second phase from T1 to T2 at an average cooling rate which is lower than 10\xb0 C.s.
12. The method according to claim 11 wherein the cooling from T1 to T2 proceeds at an average cooling rate which is lower than 5\xb0 C.s.
13. The method according to claim 12 further comprising a heating step between step (iii) and step (iv), wherein dining said heating step the web temperature is maintained above the glass transition temperature of the phenolic resin during a period of between 0.1 and 60 seconds.
14. The method according to claim 11 wherein T1 is Tg+20\xb0 C. and T2 is Tg\u221220\xb0 C.
15. The method according to claim 14 further comprising a heating step between step (iii) and step (iv), wherein during said heating step the web temperature is maintained above the glass transition temperature of the phenolic resin during a period of between 0.1 and 60 seconds.
16. The method according to claim 11 wherein T1 is Tg+10\xb0 C. and T2 is Tg\u221210\xb0 C.
17. The method according to claim 16 further comprising a heating step between step (iii) and step (iv), wherein during said heating step the web temperature is maintained above the glass transition temperature of the phenolic resin during a period of between 0.1 and 60 seconds.
18. The method according to claim 11 further comprising a heating step between step (iii) and step (iv), wherein during said heating step the web temperature is maintained above the glass transition temperature of the phenolic resin during a period of between 0.1 and 60 seconds.
19. The method according to claim 10 wherein during the cooling step the web temperature is reduced
in first phase down to T1 at an average cooling rate of at least 10\xb0 C.s; and
in a second phase from T1 to T2 at an average cooling rate which is lower than 10\xb0 C.s; and
in a third phase from T2 to about ambient temperature at an average cooling rate of at least 10\xb0 C.s.
20. The method according to claim 19 wherein the cooling from T1 to T2 proceeds at an avenge cooling rate which is lower than 5\xb0 C.s.
21. The method according to claim 20 further comprising a heating step between step (iii) and step (iv), wherein during said heating step the web temperature is maintained above the glass transition temperature of the phenolic resin during a period of between 0.1 and 60 seconds.
22. The method according to claim 19 wherein T1 is Tg+20\xb0 C. and T2 is Tg\u221220\xb0 C.
23. The method according to claim 19 wherein T1 is Tg+10\xb0 C. and T2 is Tg\u221210\xb0 C.
24. The method according to claim 19 further comprising a heating step between step (iii) and step (iv), wherein during said heating step the web temperature is maintained above the glass transition temperature of the phenolic resin during a period of between 0.1 and 60 seconds.
25. The method according to claim 10 wherein the cooling from T1 to T2 proceeds at an average cooling rate which is lower than 5\xb0 C.s.
26. The method according to claim 25 wherein T1 is Tg+20\xb0 C. and T2 is Tg\u221220\xb0 C.
27. The method according to claim 25 wherein T1 is Tg+10\xb0 C. and T2 is Tg\u221210\xb0 C.
28. The method according to claim 25 further comprising a heating step between step (iii) and step (iv), wherein during said heating step the web temperature is maintained above the glass transition temperature of the phenolic resin during a period of between 0.1 and 60 seconds.
29. The method according to claim 10 wherein T1 is Tg+20\xb0 C. and T2 is Tg\u221220\xb0 C.
30. The method according to claim 29 further comprising a heating step between step (iii) and step (iv), wherein during said heating step the web temperature is maintained above the glass transition temperature of the phenolic resin during a period of between 0.1 and 60 seconds.
31. The method according to claim 10 wherein T1 is Tg+10\xb0 C. and T2 is Tg\u221210\xb0 C.
32. The method according to claim 31 further comprising a heating step between step (iii) and step (iv), wherein during said heating step the web temperature is maintained above the glass transition temperature of the phenolic resin during a period of between 0.1 and 60 seconds.
33. The method according to claim 10 further comprising a heating step between step (iii) and step (iv), wherein during said heating step the web temperature is maintained above the glass transition temperature of the phenolic resin during a period of between 0.1 and 60 seconds.
34. The method according to claim 1 further comprising a heating step between step (iii) and step (iv), wherein during said heating step the web temperature is maintained above the glass transition temperature of the phenolic resin during a period of between 0.1 and 60 seconds.