JPS6239400Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a copying machine with an improved mounting structure for a developing device.

Generally, in the case of a copying machine using a powder developing material, an image forming unit, for example, a developing device is provided in the main body of the copying machine, facing an image bearing member, for example, a photoconductor drum, and this developing device causes the surface of the photoconductor drum to be A powder developing material is supplied to form a toner image. Further, the developing device is removably installed and can be taken out for maintenance and inspection. Further, the above-mentioned developing device usually has a soft and elastic member such as moltoprene or a flocked brush on its frame or cover, and this member prevents the developing material from scattering outside the developing device. .

By the way, the surface of the photoreceptor drum mentioned above is damaged when the developing device is attached or removed, and the maltoprene or the flocked brush or the developer carrier contained in their eyes rubs against the surface of the photoreceptor drum, causing damage that deteriorates the image quality. It was hot.

Therefore, in the past, the operations of attaching and detaching the developing device and setting it at the developing position were performed in two steps. That is, when removing the developing device, first move the developing device away from the photoreceptor drum and then slide it out. When installing, insert the developing device with the developing device separated from the photoreceptor drum, and then remove the developing device from the photoreceptor drum. It was moved towards the body drum and brought close to it.

However, because the conventional type requires a link mechanism and a stopper due to its structure, it is structurally complex, increases costs, requires a large space, and is complicated to operate because it is divided into two stages. Ta.

This invention was made with attention to the above circumstances,
The purpose of this is to create a copying machine with a simple structure that allows the image forming unit to be moved toward and away from the image carrier in a single operation, and to be attached and detached without contacting the image carrier. This is what we are trying to provide.

Hereinafter, one embodiment of the present invention will be described based on the drawings. In the figure, reference numeral 1 denotes a bottom plate of the main body of the copying machine, and a photosensitive drum 2 is provided above the bottom plate 1. As shown in FIG. Further, first and second guide bodies 3 and 4 are disposed on the bottom plate 1 so as to be spaced apart from each other, and a developing device 5 is slidably disposed between the first and second guide bodies 3 and 4. It is placed there. The first and second guide bodies 3 and 4 are disposed parallel to each other along the rotation axis 2a of the photoconductor drum 2, and have one end facing toward the photoconductor drum 2 as shown in FIG. Directing bends 6, 7 are provided. The length of the bent portion 7 is A, and the length of the bent portion 6 is A.
A', and A is larger than A'. Also,
The amount of protrusion of the bent portion 7 is S, and the amount of protrusion of the bent portion 6 is S.
It is said to be S′.

On the other hand, the developing device 5 is constructed as shown in FIG. That is, 8 is an apparatus main body, and a supply roller 9 is rotatably provided in the main body 8, and powder developing material is supplied from the front opening 10 of the apparatus main body 8 by rotation of the supply roller 9. It's getting old. Furthermore, elastic members 11 for preventing developer scattering are attached to both sides and the upper edge of the front opening 10 of the apparatus main body 8. At both ends of the bottom plate 12 of the apparatus main body 8, engaging bodies, for example, projections 13a and 13b projecting laterally, as shown in FIG. 3, are provided.
The length E of these projections 13a and 13b is made equal to the difference between the lengths A' and A of the bent portions 6 and 7.

As shown in FIG. 2, a pin 14 is provided protruding from the side surface of the apparatus main body 8, and this pin 14 is inserted into a fitting hole 15 formed in the inner wall surface of the copying machine main body 1 to perform development. The device 5 is set in a predetermined position. Further, 16 is a screw for positioning and for preventing coming off.

Therefore, when installing the developing device 5, the bottom plate 12 of the developing device 5 is connected to the first and second guide bodies 3,
4 and move it forward. During this insertion, the protrusion 13a of the bottom plate 12 slides along the inner surface of the second guide body 4, and the elastic member 11 of the developing device 5 is inserted with a distance of S dimension from the circumferential surface of the photoreceptor drum 2. . As a result, when the developing device 5 is inserted by a predetermined amount, the corner 13c of the insertion end of the bottom plate 12 becomes the first
At the same time, the protrusion 13a of the bottom plate 12 moves along the bend 7 of the second guide 4 toward the photoreceptor drum 2, and the elastic member 11 is moved toward the photoreceptor drum 2. close to surroundings. Also, at this time, the pin 14 is fitted into the fitting hole 15 of the main body of the copying machine, and the developing device 5 is set at the developing position. After the developing device 5 is set in this way, the rear end of the bottom plate 12 is fixed with the screw 16 for positioning and prevention of coming off, thereby completing the installation.

Further, when removing the developing device 5, the screw 16 is removed and then the developing device 5 is pulled. This results in
As the pin 14 comes out of the fitting hole 15, the bottom plate 1
2 moves along the bent portion 7, and the elastic member 11 of the developing device 5 is spaced apart from the photoreceptor drum 2 by a dimension S. When the base plate 12 is further pulled out after being separated in this manner, the protruding portion 13a of the bottom plate 12 slides along the inner surface of the second guide body 4, and the above-mentioned dimension S is maintained when the base plate 12 is pulled out.

As described above, since the developing device 5 can be attached and detached by simply sliding it toward and away from the photoreceptor drum 2 without coming into contact with the photoreceptor drum 2, the attaching and detaching operation can be performed in one operation. Since the bending portions 6 and 7 are formed on the guide bodies 3 and 4 and the protruding portions 13a and 13b are formed on the bottom plate 12 of the developing device 5, the structure can be simplified.

As explained above, the present invention moves the image forming unit from a first position close to the image carrier by sliding the image forming unit parallel to the rotation axis of the rotatably supported image carrier. The image carrier is moved to a second position away from the image carrier, and the image carrier has a bent portion that is provided parallel to the rotation axis of the image carrier and a portion of which is bent in a direction approaching the image carrier. The image forming apparatus includes a guide body and an engaging body that engages with the guide body and moves the image forming unit between the first position and the second position by sliding the image forming unit. The image forming unit can be moved toward and away from the image carrier to be attached and detached simply by sliding the image forming unit, making attachment and detachment work extremely easy and compared to systems that require link mechanisms, stoppers, etc. This has the effect of simplifying the structure and reducing costs.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; Fig. 1 is a side view showing the developing device installed, Fig. 2 is a perspective view showing the developing device, and Fig. 3 is a plan view showing the main parts. be. 2... Photosensitive drum, 2a... Rotating shaft, 3, 4
...Guide body, 6, 7...Bending portion, 13a...Protrusion portion.

Claims (1)

[Scope of utility model registration request] a first position in which the image forming unit is moved away from the image carrier from a first position proximate to the image carrier by sliding the image forming unit parallel to the rotation axis of the rotatably supported image carrier; a pair of guides that are provided parallel to the rotation axis of the image carrier, are spaced apart from each other and have bent portions that are partially bent in a direction approaching the image carrier; and a bottom plate of the image forming unit, and when the bottom plate of the image forming unit is inserted between the pair of guide bodies and moves, it slides on the guide body and moves the image forming unit to the first position. and an engaging body that is moved between the second position and the second position.