JP3204522B2 - Photoconductor positioning device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrostatic recording apparatus and, more particularly, to an apparatus for positioning a photosensitive member for forming an electrostatic latent image.

[0002]

2. Description of the Related Art FIG. 4 shows a general configuration of an electrostatic recording apparatus. 1 is a driving roller, 2 is a driven roller,
Reference numeral 3 denotes a tension roller, and reference numeral 4 denotes a photosensitive member which is stretched over the rollers 1, 2, and 3 and is circulated and moved in the direction of the arrow.

The photoreceptor 4 is first discharged by a discharge lamp 5 and then uniformly charged by a charging unit 6 to form an electrostatic latent image by exposure by an optical writing unit 7. Next, the toner image is formed by developing with the developing roller 8, and the toner image is transferred to the separately fed recording paper 10 in the transfer unit 9. After the recording paper 10 to which the toner image has been transferred is fixed by the fixing roller 11,
The toner is discharged as a copy. On the other hand, the residual toner is removed from the photoconductor 4 after the transfer by the cleaning blade 12.
It is submitted to the next recording process.

In a conventional device of this type, a driving roller 1 on which a photosensitive member 4 is stretched, a driven roller 2 and the like are arranged as shown in FIG.
As shown in (1), a housing (for example, a side plate) 1 of the recording apparatus main body 1
5, so that the position of the roller is determined when the recording apparatus is manufactured.

[0005]

As described above, since the position of the roller depends on the accuracy of the components of the housing of the recording apparatus, the accuracy of the parallelism between the rollers cannot be obtained, and the photosensitive member and other units cannot be obtained. There was a problem in the relative position accuracy with respect to.

The present invention is intended to solve such a problem, and determines the positional relationship between the photosensitive member and other units such as a cleaning blade and a developing roller, as well as the parallelism between the rollers. In addition, it is an object of the present invention to provide a photoconductor positioning device capable of easily adjusting the positional relationship between the recording devices even after the recording device is assembled.

[0007]

In order to achieve the above-mentioned object, the present invention provides a photosensitive member unit which is attached to and detachable from a recording apparatus main body by attaching a photosensitive member to a plurality of rollers, and circulates the photosensitive member. In an electrostatic recording apparatus that forms an electrostatic latent image by moving, a positioning member provided on each of a pair of roller holding members that hold a plurality of rollers of the photoconductor unit at both ends thereof; Attached to the housing,
A rail holding member having a rail for guiding and supporting the positioning member when inserting and removing the photoconductor unit, wherein a mounting position of the rail holding member is adjustable.

Further, the mounting position of the rail holding member can be adjusted from outside the recording apparatus main body.

[0009]

According to the above arrangement, by adjusting the mounting position of the rail holding member, the parallelism between the rollers or the relative position between the photoconductor and other units can be set with high accuracy.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments will be described below in detail with reference to the drawings.

FIG. 1 is a perspective view showing a photoconductor positioning device according to an embodiment of the present invention, and FIG. 2 is a side view of the photoconductor positioning device. 1 and 2, the same components as those described above are denoted by the same reference numerals, and 17 is a pair of roller holding members that hold the driving roller 1 and the driven roller 2 at both ends. . A photoreceptor unit 20 is composed of a driving roller 1, a driven roller 2, a tension roller 3 held by the roller holding member 17, and a photoreceptor 4 stretched over each of these rollers. It can be inserted and removed. The roller holding member 17 includes
A positioning projection 18 and a positioning pin 19 are provided, respectively.

On the other hand, a rail holding member 22 having a rail 21 which is attached to the housing 15 of the main body of the recording apparatus and guides and supports the positioning projection 18 when inserting and removing the photosensitive unit 20, and a positioning pin 19 are engaged. A matching pin receiving member 23 is provided. Here, in particular, the configuration is characterized in that the mounting position of the rail holding member 22 is configured to be adjustable by an adjusting unit such as the screw 24.

FIG. 3 shows the positioning projection 18 and the rail 21 for guiding the same when the photoconductor unit 20 is inserted into the recording apparatus main body, and the positioning pin 19 and the pin receiving member 23 with which it is engaged. It shows the relationship.
FIG. 3A shows the states during the insertion, and FIG. 3B shows the states at the time of the completion of the insertion.

In this embodiment constructed as described above, the positions of the driving roller 1 and the driven roller 2 are determined while the positioning projection 18 and the positioning pin 19 are held by the rail 21 and the pin receiving member 23, respectively. And therefore
The mutual positional relationship between the photoconductor 4 and other units is also determined.
Therefore, if there is a defect in the positional relationship, the mounting position of the rail holding member 22 can be adjusted to an appropriate positional relationship by adjusting the adjusting portion such as the screw 24. And the relative position of the photoconductor and other units can be set with high accuracy.

In this embodiment, it is possible to easily adjust the position of the roller from outside the main body of the recording apparatus.

[0016]

As described above, according to the present invention,
The degree of parallelism between the rollers and the positional relationship between the photoconductor and other units such as the cleaning blade and the developing roller can be accurately determined, and even after the recording apparatus is assembled, their positional relationship can be easily determined. The effect is that the image quality can be adjusted and the image quality can be improved.

[Brief description of the drawings]

FIG. 1 is a perspective view of a photoconductor positioning device according to an embodiment of the present invention.

FIG. 2 is a side view of the photoconductor positioning device of FIG. 1;

FIG. 3 is a view showing a relationship between a positioning protrusion and a positioning pin, a rail, and a pin receiving member when the photoconductor unit of FIG. 1 is inserted.

FIG. 4 is a general configuration diagram of an electrostatic recording apparatus.

FIG. 5 is a diagram illustrating a configuration of a conventional example in which a roller is held by a housing of a recording apparatus.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Drive roller, 2 ... Follower roller, 3 ... Tension roller, 4 ... Photoconductor, 15 ... Housing, 17 ... Roller holding member, 18 ... Positioning protrusion, 19 ... Positioning pin, 20 ... Photoconductor unit, 21 ... Rail, 22
... Rail holding member, 23 ... Pin receiving member, 24 ... Screw.

Continuation of front page (58) Fields investigated (Int.Cl. ⁷ , DB name) G03G 15/00 G03G 21/00 G03G 21/16-21/18 B65H 5/02 B65G 15/00-15/64 F16H 7 / 00-7/24

Claims (2)

(57) [Claims] 1. An electrostatic recording apparatus in which a photoconductor is stretched over a plurality of rollers to form a photoconductor unit that can be inserted into and removed from a recording apparatus main body, and the photoconductor is circulated to form an electrostatic latent image. A positioning member provided on each of a pair of roller holding members for holding a plurality of rollers of the photoconductor unit at both ends thereof , attached to a housing of a recording apparatus main body,
A rail holding member having a rail for guiding and supporting the positioning member when inserting and removing the photoconductor unit, wherein a mounting position of the rail holding member is adjustable. 2. The photoconductor positioning device according to claim 1, wherein the mounting position of the rail holding member is adjustable from outside the recording apparatus main body.