Developing cartridge and image forming device
A developing cartridge that maintains a pressing condition to press a developer carrier against the image carrier is described. The developing cartridge may include a coil spring that presses the developer carrier against the image carrier. The coil spring may include a handle that transmits a pressing force to the coil spring via the contacting member. By doing so, every time the developing cartridge is replaced, a new coil spring and handle can be provided for the color laser printer with the developing cartridge attached. Therefore, a constant pressure by the coil spring can be continuously maintained. Thus, a preferable pressure condition of the developer carrier against the image carrier can be continuously maintained.
1. A developing cartridge comprising:
a case configured to contain developer;
a developer carrier configured to hold the developer thereon,
a developer carrier support located near one end of the case, the developer carrier support supporting the developer carrier so as to be rotatable about an axis of rotation;
a pressing member configured to pivot about an axis parallel to the axis of rotation of the developer carrier; and
an elastic member configured to be pressed by the pressing member, the elastic member applying a pressing force to the case near an opposite end of the case.
2. The developing cartridge according to claim 1 , wherein the pressing member is located at a portion projecting outside of the case.
3. The developing cartridge according to claim 1 ,
wherein the pressing force to be applied to the case is a first pressing force; and
wherein the pressing member is configured to pivot based on receiving a second pressing force.
4. The developing cartridge according to claim 3 ,
wherein the pressing member is configured to convey the second pressing force to the elastic member during the pivoting of the pressing member.
5. The developing cartridge according to claim 1 ,
wherein the pressing member is configured to press the elastic member during the pivoting of the pressing member.
6. The developing cartridge according to claim 1 ,
wherein the pressing member is configured to pivot relative to the case.
7. The developing cartridge according to claim 1 , wherein the elastic member is attached to the case.
8. The developing cartridge according to claim 7 , wherein the elastic member is a coil spring.
9. The developing cartridge according to claim 8 , wherein the pressing member is a handle.
10. The developing cartridge according to claim 7 , wherein the elastic member is made of a resilient material.
11. The developing cartridge according to claim 10 , wherein the pressing member has a length approximately identical to a length of the developer carrier.
12. The developing cartridge according to claim 7 , wherein the elastic member is a plate spring.
13. The developing cartridge according to claim 1 , wherein the elastic member is mounted on the pressing member.
14. The developing cartridge according to claim 13 , wherein the pressing member is a handle that is attached to the case.
15. The developing cartridge according to claim 13 , wherein the elastic member is a coil spring attached to the pressing member, the pressing member being attached to the case.
16. The developing cartridge according to claim 13 , wherein the elastic member is a ring attached to the pressing member.
17. The developing cartridge according to claim 13 , wherein the elastic member is made of a resilient material.
18. The developing cartridge according to claim 17 , wherein the pressing member has a length approximately identical to a length of the developer carrier.
19. The developing cartridge according to claim 1 , wherein the elastic member includes at least two elastic members that are separated from each other in a direction parallel to the axis of rotation of the developer carrier.
20. The developing cartridge according to claim 19 , wherein the elastic members are separated from each other by approximately the length of the developer carrier.
21. The developing cartridge according to claim 1 , further comprising:
a guide member that guides the deformation of the elastic member.