JPH0515060U - Development device attachment / detachment mechanism - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a developing device attaching / detaching mechanism capable of preventing the generation of noise due to a reaction when the developing device is detached and the replenishment of toner other than necessary. A pressure plate spring is provided on a developing device fixing base, and a detachable cam is provided that is rotatably supported by a main body of an image forming apparatus and presses a free end of the pressure plate spring. The free end of the pressure plate spring abuts on the detachable cam when the pressure of the fixed base is released by being rotated.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an attachment / detachment mechanism of a developing device of an image forming apparatus.

[0002]

[Prior Art]

 Most of the conventional developing devices in image forming apparatuses such as copying machines and facsimiles are the same as those of the embodiments of the present invention, and therefore, description will be made with reference to them. 1 and 2, the developing device 1 of the image forming apparatus slides a fixed base 3 on which the developing device 1 is installed in a substantially horizontal direction to attach / detach the latent image carrier 6 of the image forming apparatus. Is supposed to do. Also, by this horizontal slide, the drive gears 7 and 8 on the main body side of the image forming apparatus engage and disengage the driven gears 9 and 10 on the developing device 1 side so that the developing device 1 can be driven or stopped. It has become. Further, as a means for sliding the developing device 1 toward the latent image carrier 6, the directional spring 16 which utilizes the elastic force of the pressure plate spring 4 and releases it is used. Further, as shown in FIG. 5, when the attachment / detachment cam 11 is rotated about the support shaft 12 to the position shown by the chain double-dashed line, and the pressure of the developing device 1 on the latent image carrier 6 is released, The pressure leaf spring 4 does not contact the detachable cam 11 as shown by the chain double-dashed line, and is open. Reference numeral 2 indicates a toner supply tank.

[0003]

[Problems to be solved by the device]

 In the conventional developing device attaching / detaching mechanism as described above, it is necessary to slide the fixing base when the drive gear on the main body side of the image forming apparatus and the driven gear on the developing device side are engaged or disengaged. However, there is a problem in that when the gears are disengaged, a reaction occurs due to the force after the gears are disengaged, noise is generated, and unnecessary toner is replenished.

Therefore, an object of the present invention is to solve the above-mentioned problems of the conventional developing device, to generate a sound due to a reaction when the current image device is separated from the latent image carrier, and to replenish toner other than necessary. SUMMARY OF THE INVENTION It is an object of the present invention to provide a developing device attaching / detaching mechanism capable of preventing the above problems.

[0005]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention has a pressure plate spring arranged on a fixed base and rotatably supported by a main body of an image forming apparatus to apply a free end of the pressure plate spring. A detachable cam for pressing is provided, and when the detachable cam is rotated to release the pressure on the fixed base, the free end of the pressing leaf spring abuts on the detachable cam. Further, when the pressure applied to the fixed base is released, the free end of the pressure leaf spring and the contact portion of the detachable cam are in parallel contact with each other.

[0006]

[Action]

 In this invention as described above, when the attachment / detachment cam is rotated counterclockwise from the state of being pressurized by the pressure plate spring attachment / detachment cam to release the pressure of the pressure leaf spring, the fixing table and the developing unit are released. The device is separated from the latent image carrier. Then, the free end of the pressure leaf spring comes into contact with the detachable cam that has finished rotating, and the fixing base and the developing device stop.

[0007]

【Example】

 An embodiment of the present invention shown in FIGS. 1 to 4 will be described with reference to the drawings. In FIG. 1 showing a first embodiment of the present invention, a developing device 1 is mounted on a fixed base 3, and a fixed plate spring 4 is arranged on the fixed base 3. In the developing device 1, the pressure leaf spring 4 is pressed against the latent image carrier 6 by the tip end portion 18 of the arm of the attachment / detachment cam 11, and is brought into close contact with the latent image carrier 6. Further, the attachment / detachment cam 11 is connected to the operation lever 13 and is rotatably supported by the support shaft 12.

FIG. 2 shows a state in which the developing device 1 of the first embodiment of the present invention is separated from the latent image carrier 6. When the operation lever 13 is rotated counterclockwise by about 90 °, the detachable cam 11 connected thereto is also rotated in the same manner, and the pressure of the pressure leaf spring 4 is released, and the release spring 16 causes the release spring 16 to release the pressure. The fixed base 3 and the developing device 1 are separated from the latent image carrier 6. At that time, as shown in FIG. 3, the free end of the pressure leaf spring 4 horizontally moves to a position where it abuts on the shoulder 17 of the detachable cam 11 and stops. When they come into contact with each other, the shock is damped by the spring effect.

The second embodiment of the present invention is as shown in FIG. 4, in which the shoulder portion 17 of the detachable cam 11 is cut and formed in parallel with the direction of the free end of the pressure leaf spring 4. Therefore, when the pressurization of the fixed base 3 is released, the attachment / detachment cam 11 and the pressure plate spring 4 are in surface contact with each other, so that the stationary position of the fixed base 3 is stable.

[0010]

[Effect of the device]

 This invention is as described above, and when the detachable cam is rotated to release the pressure on the fixing base and the developing device is also detached from the latent image carrier, the free end of the pressure leaf spring acts as the detachable cam. Since it abuts and stops, the elastic deformation of the pressure leaf spring cushions the impact, and the generation of sound and the replenishment of toner other than necessary can be prevented. Furthermore, when pressure is released from the fixed base, the free end of the pressure plate spring and the contact part of the detachable cam make contact with each other in parallel. It has the effect of stabilizing the position.

[Brief description of drawings]

FIG. 1 is a diagram showing a state in which a developing device according to a first embodiment of the present invention is close to a latent image carrier.

FIG. 2 is a diagram showing a state in which the developing device of the first embodiment is released from a latent image carrier.

FIG. 3 is a partial view showing a state where the pressure leaf spring and the detachable cam of the first embodiment are in contact with each other.

FIG. 4 is a partial view showing a state where a pressure leaf spring and a detachable cam of the second embodiment are in contact with each other.

FIG. 5 is a partial view showing a conventional removable cam portion.

[Explanation of symbols]

 1 Developing Device 3 Fixing Stand 4 Pressurizing Leaf Spring 11 Attachment / Detachment Cam 12 Spindle 13 Operation Lever 17 Shoulder of Attachment / Detachment Cam 18 Tip of Arm of Attachment / Detachment Cam

Claims (2)

[Scope of utility model registration request] 1. A developing device configured to attach / detach the developing device to / from a latent image carrier of an image forming apparatus by sliding a developing device fixing base on which the developing device is installed in a substantially horizontal direction. In the attachment / detachment mechanism, a pressure plate spring is disposed on the fixed base, and a detachable cam that is rotatably supported by the main body of the image forming apparatus to press the free end of the pressure plate spring is provided. An attaching / detaching mechanism of a developing device, wherein a free end of a pressure plate spring abuts on a detachable cam when the pressure of the fixed base is released by being rotated. 2. The attaching / detaching mechanism according to claim 1, wherein when the pressurization of the fixing base is released, the free end of the pressing leaf spring and the contact portion of the attaching / detaching cam are in parallel contact with each other.