JPH0425709Y2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field This invention has an electrophotographic device, more specifically, an upper body that can be opened and closed relative to the lower body, and a photoreceptor unit installed in the upper body. - This relates to a photoreceptor unit positioning device for an electrophotographic device applied to a printer or the like.

Prior Art A typical conventional example of a photoreceptor unit positioning device for an electrophotographic apparatus of the type described above is shown in FIG. 4, and will be described below.

Reference numeral 1 indicates a photoreceptor unit, and this unit 1 has a case 6, in which an endless photoreceptor belt 2, a drive roller 3 for conveying the belt 2,
A driven roller 4 and a tension roller 5 are arranged, two horizontal protrusions 15 are provided on the side wall of the case 6 opposite to the drive roller 3, and a self-cleaning lens arranged on the upper body is provided on the top plate. 11 and lens positioning members 12 provided before and after the lens positioning member 11
A positioning hole 7 into which is inserted is formed, and an exposure guide plate 17 is provided below this positioning hole 7. The shaft of the drive roller 3 is spaced apart perpendicularly to the drawing of a developing device (not shown) provided in the lower body, and is supported by a pair of support members 18 having a U-shaped notch in the upper part. There is. The lower part of the photoreceptor unit 1 is pushed up by the spring 14 via the transfer charger 13, the protrusion 15 comes into contact with the upper rail 8 attached to the holding member 16 of the upper body, and the exposure guide plate 17 is pushed up against the lens. It comes into contact with the positioning member 12. Note that 9 indicates a lower rail and 10 indicates a contact glass.

From the above, it can be seen that the positioning of the photoreceptor unit 1 is performed as follows.
That is, (1) positioning in the x direction is achieved by fitting the support member 18 provided on the lower body with the shaft of the drive roller 3 of the photoconductor unit 1 mounted on the upper body supported by the support member 18. 2) Positioning in the y direction is achieved by the contact between the exposure guide plate 17 and the lens positioning member 12 and the contact between the protrusion 15 and the upper rail 8 on both outer sides of the photoreceptor belt 2. (3) Positioning in the z direction is achieved by , by fitting the positioning hole 7 and the lens positioning member 12.

By the way, since the positioning in the x direction is performed as described above, the movement of the photoreceptor belt 2 follows that of the lower body. On the other hand, since the self-cleaning lens 11 and the contact glass 10 are attached to the upper body, their movements follow those of the upper body. By the way, in the case of such a photographic device, both the document and the photoreceptor move in the x direction, and if there is uneven speed between the two, a so-called jitter phenomenon will occur, which will have a negative effect on image quality. Become. However, in the conventional device as described above, the movement of the photoconductor follows the upper body, and the movement of the original follows the movement of the lower body, so vibrations in the upper and lower bodies cause damage between the document and the photoconductor during exposure. The disadvantage is that it causes speed unevenness, which causes jitter.

In order to eliminate these drawbacks, it was proposed to fix the photoconductor unit with a rear plate so that positioning could be performed only with the upper body, but this was complicated to operate, and the photoconductor unit This method has the disadvantage that it is difficult to apply to an electrophotographic device in which the unit is replaced by the user.

Purpose The purpose of this invention is to eliminate the drawbacks of the conventional photoconductor unit positioning device as described above, to eliminate speed unevenness between the document and the photoconductor during exposure, and to provide a photoconductor unit that is easy to operate. To provide a body unit positioning device.

Configuration: In order to achieve the above-mentioned object, this invention provides at least one positioning means for the photoreceptor unit.
is located at a position evacuated from the insertion path of the photoreceptor unit when the upper body is opened, and is installed at a predetermined position when the upper body is closed.

This invention will be specifically explained based on the embodiment shown in FIGS. 1 to 3.

In this embodiment, parts that are the same as those in the conventional system are designated by the same reference numerals, and explanation thereof will be omitted, and only the different parts will be explained.

As shown in FIG. 3, the tip of the shaft 22 of the drive roller 3 has a conical shape, and in the state shown in FIG. A center hole 30 of a drive gear 28 attached to a rotatably supported drive shaft 27
Positioning in the x direction is performed by fitting and supporting the A long hole 31 is provided in the side wall of the support arm 25, into which a pin 26 protruding from the upper fuselage is fitted, and a slight vertical y direction centering on the support shaft 24 of the support arm 25 is fitted. It is possible to move.

The drive roller 3 is supported by a support member 21 which has a U-shaped notch at the top like the support member 18 described above, but unlike the support member 21, it is movable in the x direction. In addition to that,
Pressure is applied from above with one end of the pressure arm 32. This pressurizing arm 32 is pivoted approximately at its center to the upper body by a pivot 33, is constantly pulled downward by a spring 34 on the side opposite to the drive roller 3, and pressurizes the other end, that is, the end on the side of this spring 34. The upper end of a lever 35 is pivotally supported, and the upper end of a spring 36 is attached to the lower part of this pressure lever, and the lower end of this spring 36 is a free end. In the case of FIG. 1, the lower end of the spring 36 contacts and presses the pedestal 37 of the lower body, and the pressing force causes the pressing arm 32 to rotate counterclockwise against the tensile force of the spring 34. As a result, the drive roller 3 is pressed at one end as described above, and in this state, the force of the pressure arm 32 pressing the drive roller 3 downward, the spring 34,
The power of 36 is balanced.

FIG. 2 shows the state in which the photoreceptor unit 1 is inserted into the upper body when the upper body is opened. At this time, the photoreceptor unit 1 is tilted with the protrusion 15 side downward, and the protrusion 15 is placed on the lower rail 9 and is pushed in while sliding along this. As a result, the self-cleaning lens 11 and its positioning member 12 are retracted out of the traveling path of the unit 1, and do not obstruct its traveling. Further, the pressure arm 32 is pulled by the spring 34, and the other spring 36 has a free end at the bottom and there is nothing to restrain it, so the one end that presses the drive roller 3 when closed is displaced upward. Therefore, there is no need to retreat outside the path of unit 1 and hinder its progress.

When the insertion of the unit 1 is completed in this way, the tip of the shaft 22 of the drive roller 3 fits into the center hole 30 of the drive gear 28 as described above and is positioned in the x direction. Hole 31
Positioning in the y direction is not achieved by fitting the pin 26 into the y-direction. Now, when the upper fuselage is closed, y
Positioning in the direction and z direction will be performed.

In this way, in the unit 1 as shown in FIG. 1 again, the driving of the driving roller 3 is as follows.
As the drive gear 28 rotates, the drive pin 29 engages the driven pin 23 and rotates the shaft 22.

Effects This invention is as described above, and when the upper body is opened, the photoconductor unit is located in a retracted position outside the travel path of the photoconductor unit, and when the upper body is closed, it is engaged with the drive shaft of the drive roller of the photoconductor belt. , a positioning member for positioning the photoconductor unit in the x direction is provided on the upper body, and a support member for supporting the drive shaft is also provided when positioning the drive shaft, so that all positioning of the photoconductor unit is done in the upper body. This is achieved by the mutual cooperation of the assembled parts, and the optical system is also installed in the same upper body, so even if there is vibration in the upper and lower bodies during exposure, there is no speed difference between the original and the photoreceptor. There is no unevenness, and therefore jitter can be prevented from occurring, and since the positioning member is retracted out of the path of movement when the photoreceptor unit is opened, it does not interfere with the opening/closing work of the photoreceptor unit. Furthermore, there is an advantage that there is no need for complicated operations such as fixing the photoreceptor unit with a face plate for positioning.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional front view of a part of the embodiment of this invention, FIG. 2 is a front view showing the photoconductor unit in the same state when it is inserted into the upper body, and FIG. 3 is the x A perspective view of the directional positioning mechanism, FIG. 4, is a drawing similar to FIG. 1 of a conventional typical example of this type of positioning device. 1...Photoconductor unit, 2...Photoconductor belt,
3... Drive roller, 6... Case, 7... Positioning hole, 8... Upper rail, 9... Lower rail, 1
DESCRIPTION OF SYMBOLS 1...Self-occurring lens, 12...Lens positioning member, 15...Protrusion, 17...Exposure guide plate, 21...Supporting member, 22...Roller shaft, 2
4... Support shaft, 25... Support arm, 27... Drive shaft, 28... Drive gear, 30... Center hole, 32
...Pressure arm, 33...Pivot, 34, 36...
Spring, 35...pressure lever.

Claims (1)

[Scope of utility model registration request] A lower body, an upper body attached to the lower body so as to be openable and closable, and a photoreceptor belt that is attached to the body when the upper body is opened and is conveyed by a drive roller therein. a photoconductor unit, and an optical system provided in a fixed position on the upper body, and when the upper body is closed, a lens positioning member of the optical system and an exposure guide plate of the photoconductor unit located below it. and are in contact,
In a photoconductor unit positioning device of an electrophotographic apparatus, which positions the photoconductor unit in the y direction, when the upper body is opened, the photoconductor unit is in a retracted position outside the travel path of the photoconductor unit, and when the upper body is closed, the photoconductor unit The upper body is provided with a positioning member that engages with the drive roller of the body belt to position the photoreceptor unit in the x direction, and further includes a support member that supports the drive roller when positioning the drive roller. Features of a photoconductor unit positioning device for an electrophotographic device.