JPH0453969A - Image forming device - Google Patents

Abstract

PURPOSE:To easily adjust an optical axis or squareness by providing a supporting shaft bearing part of laying a supporting shaft between the side plates in a state where the supporting shaft is orthogonally crossed with the side plate on a pair of side plates. CONSTITUTION:The supporting shaft bearing part 18a for laying the supporting shaft 41a which is pulled out from a device main body 1 and a photosensitive drum 41 between the side plates 18 is provided on the side plate 18. The bearing part 18a is constituted of a circular through hole in which the supporting shaft 41a is inserted with almost no looseness and the supporting shaft 41a is arranged at right angle to the side plate 18 between a 1st moving body S1 and a 2nd moving body S2 by inserting the shaft 41a in the bearing part 18a. Thus, the optical axis and the squareness of the moving bodies S1 and S2 are easily adjusted.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an image forming apparatus such as an electrostatic copying machine equipped with an optical system for illuminating and scanning a document.

<Prior art and problems to be solved by the invention> Conventionally, in an image forming apparatus such as an electrostatic copying machine, a document placed on a document table is illuminated, and light reflected from the document is The optical system is equipped with an optical system that guides the photoreceptor to the photoconductor through a reflecting mirror and a lens.

This optical system generally includes a first moving body having a light source and a reflecting mirror, and a second moving body having at least one reflecting mirror, which are arranged so as to be movable back and forth between a pair of side plates.
This first moving body is moved relative to the document, and the second
By moving the first movable body at half the moving speed of the first movable body, the original is illuminated and scanned while keeping the optical distance from the original to the photoreceptor constant.

By rotating the photoreceptor while illuminating and scanning the original using the optical system, an electrostatic latent image corresponding to the image of the original is formed on the surface of the photoreceptor. The first and second moving bodies are
It is engaged with a wire stretched along the direction of movement, and this wire is driven using a pulley, a motor, etc.

On the other hand, in the above-mentioned copying machine, generally, in order to facilitate maintenance, inspection, replacement, etc., a support shaft supporting the photoreceptor is provided so as to be freely removable from the apparatus main body and the photoreceptor. Similarly, a charger such as an electrification charger for charging the photoreceptor is also provided in a removable manner with respect to the main body of the apparatus.

By the way, in the above-mentioned copying machine, when a service person goes to the user and adjusts the optical axis or the perpendicularity to the moving direction of each moving object, the serviceman performs the adjustment through trial and error while looking at the copied image. This is a common practice, and there was a problem that the adjustment work was troublesome and time-consuming.

Therefore, a copying machine has been proposed in which reference holes for adjustment are formed through each movable body and the main body of the device, and a jig is inserted through the reference holes to facilitate the adjustment. (For example, see Japanese Patent Application Laid-Open No. 61-252542). In this case, it is necessary to create a jig for each service person for the above adjustment, which increases the number of tools to be created and creates an economic burden. In addition to being large, each service person has to carry the jig at all times, which is a hassle.

This invention has been made in view of the above-mentioned problems, and an object thereof is to provide an image forming apparatus that can easily perform the above-mentioned optical axis adjustment and perpendicularity adjustment without using a special jig. do.

Means for Solving the Problems> A first invention for achieving the above object includes a first movable body having a light source for illuminating a document and at least one reflecting mirror; A second movable body having at least one reflecting mirror for guiding light to the lens is arranged so as to be movable back and forth between a pair of side plates, and a support shaft supporting the photoconductor is connected to the photoconductor and the second movable body. In the image forming apparatus that can be freely removed from the apparatus main body, a support bearing is provided on the pair of side plates to be installed between the side plates with the support shaft perpendicular to the side plates.

Further, a second invention includes a first movable body having a light source for illuminating a document and at least one reflecting mirror, and at least one reflecting mirror for guiding light from the reflecting mirror to a lens. In an image forming apparatus, a second movable body having a second movable body is disposed between a pair of side plates so as to be reciprocally movable, and the charger is removable from the apparatus main body. The charger receiver is provided with a section for installing the charger between the side plates in a state where the charger is in the same state as above.

According to the first invention, the support shaft supporting the photoreceptor can be removed from the apparatus main body and the photoreceptor, and the support shaft can be stopped by the support bearings provided on the pair of side plates. Accordingly, the support shaft can be installed between the side plates with the support shaft perpendicular to the side plates.

Therefore, in this installed state, by aligning a predetermined portion of each movable body along the support shaft, it is possible to create a perpendicularity between each movable body and the side plate.

Further, according to the second invention, the charger is removed from the device main body, and the charger receivers provided on the pair of side plates are stopped by the parts, so that the charger is placed perpendicular to the side plates. It can be constructed between the side plates.

Therefore, in this installed state, by aligning a predetermined portion of each movable body along the charger, it is possible to create a perpendicularity between each movable body and the side plate.

<Example> Embodiments will be described in detail below with reference to the accompanying drawings showing examples.

FIG. 2 is a schematic diagram showing the internal structure of an electrostatic copying machine as an image forming apparatus of the present invention.

As shown in the figure, the inside of the apparatus main body 1 is divided into an upper chamber 12 and a lower chamber 13 by a partition plate 11, an optical system 2 for document illumination and scanning is provided in the upper chamber 13, and An image forming section 4 for forming a copy image and a paper transport section 8 are provided in the chamber 13.

The optical system 2 includes a light source 21 including a light emitter 31, a main reflector 32, and a sub-reflector 33, and flat reflectors 22, 2.
3, 24, lens 25, and plane reflecting mirror 26,
By moving the light source 21 and the plane reflecting mirrors 22, 23, and 24 in the direction shown by arrow A, the document tray on the contact glass 14 serving as the document table can be illuminated and scanned.

The light source 21 and the plane reflector [22] are integrally provided on the moving frame 27, and the light source 21, the plane reflecting mirror 22, and the moving frame 27 constitute the first moving body S1. Further, the plane reflecting mirrors 23 and 24 are integrally provided with the moving frame 28, and these plane reflecting mirrors 2B
, 24, and the moving frame 28 constitute a second moving body S2. Each of the mobile bodies Sl and S2 is
As shown in FIG. 1, it is slidably supported by a pair of optical rails 29 arranged between a pair of side plates 18. Note that the optical rails 29 are each arranged parallel to the side plate 18 with the side plate 18 as a reference. Further, the first moving body S1 and the second moving body S2 are also arranged between the side plates 18, respectively.

The movement of the first moving body S1 and the second moving body S2 is performed by a pair of drive wires 51 stretched along the moving direction. This drive wire 51 has one end 51a fixed to the device main body 1, and is wound around a reversing member 52 and reversed, and then wound around a pulley 53 provided at the end of the moving frame 28 and reversed. , and then wrapped around one counter pulley 54 fixed to the main body 1 of the device, passed through a drive pulley 55 for driving the wire, and the other counter pulley 56, fixed to the movable frame 27, and then wrapped around the pulley 53 again. The terminal end is fixed to the main body 1 of the device. Therefore, when the drive pulley 55 is rotated in a predetermined direction by a motor (not shown), the two-column moving body S
l and S2 move in the six directions of arrows. Regarding the moving speed at this time, if the speed of the first moving body S1 is V, the second moving body S2 moves at a speed of V/2. Furthermore, when the motor is reversed, both pillar moving bodies Sl and S2 move in the opposite direction to arrow A.

The paper transport section 8 includes a paper feed roller 81, a paper feed path 82, a registration roller 83, a transport roller 84, a heat fixing roller 85, and an ejection roller 86. Paper P is fed one by one from the paper cassette 16, guided to the image forming section 4, where the toner image is transferred, and after being heated and fixed by the heat fixing roller 85, the paper P is discharged onto the receiver 17. This is the configuration. However, the present invention is not limited to this configuration, and it is also possible to use a paper conveying section having other conventionally known configurations, such as a configuration in which the paper feed side and the discharge side are on the same side.

The image forming section 4 includes a charger 42 and a developing device 4 around a photosensitive drum 41 that rotates in the direction shown by C in the figure.
3, a transfer charger 44, a separation belt 45, and a cleaner 46 are arranged in this order, and the charger 4
2, a document image is formed on the outer surface of the photoreceptor drum 41, which is uniformly charged, to form an electrostatic latent image, and the electrostatic charge on the periphery where the electrostatic latent image is not formed is removed by a blank lamp (not shown). Thereafter, the developing device 43 visualizes the toner image, the transfer charger 44 transfers the toner image onto the paper P, and the remaining toner can be collected by the cleaner 46. Further, in the image forming section 4, the support shaft 41a supporting the photoreceptor drum 41 is designed to facilitate maintenance inspection and replacement work of the photoreceptor drum 41.
1 and the apparatus main body 1 in a freely removable manner. Further, the electrification charger 42 is also detachably attached to the device main body 1. This charger 42 is a conventionally known type in which a discharge wire is stretched inside a long casing 42a (see FIG. 5) having a U-shaped cross section.

On the other hand, on the side plate 18, as shown in FIG.
The supporting bearing for constructing the part between the side plates 18 is the part 18a.
is provided. In the case shown in the figure, the support shaft 41a is inserted through the support shaft 41a into the support bearing 18a. , the support shaft 41a can be arranged at right angles to the side plate 18 between the first moving body S1 and the second moving body S2.

Therefore, when adjusting the optical axis or the perpendicularity to the moving direction of each moving body S1, S2, with the support shaft 41a installed between the side plates 18, the first moving body S1 is attached to the support shaft 41a. For example, by aligning the sub-reflector 31 or the plane reflector 22, it is possible to easily create a perpendicularity between the side plate 18 and the first moving body S1.
For example, by aligning the second movable body S2 with the second movable body S2, the perpendicularity between the side plate 18 and the second movable body S2 can be easily obtained. Here, since the optical axis and the moving direction of each moving body S1.52 are usually initially set with the side plate 18 as a reference, the side plate 18 is set using the support shaft 41a.
By establishing a perpendicularity between the first moving body S1 and the first moving body S1, it is possible to correct the perpendicularity with respect to the optical axis and the moving direction of each of the moving bodies S1 and S2.

Note that the part 18a of the support bearing may be a notch as shown in FIG. 3 instead of a through hole, and the support shaft 4
1a is supported at right angles to the side plate 18,
As shown in FIG. 4, the support shaft 41a may be allowed to move in the lateral direction.

FIG. 5 is a perspective view showing another embodiment. In this embodiment, the support bearing is located between the pair of side plates 18 at the portion 18a.
A charger receiving portion 18b is provided instead. This charger receiving part 18b is installed between the side plates 18 in a state where the charger 42 is orthogonal to the side plates 18, and in the case of the figure, the charger 42 can be inserted therethrough almost without wobbling. It consists of a rectangular through hole.

In this embodiment as well, the charger 42 is connected to the side plate 18.
The perpendicularity between the side plate 18 and each of the movable bodies S1 and S2 can be easily corrected by placing the movable bodies S1 and S2 along the charger 42 while the movable bodies S1 and S2 are installed in between.

Note that the charger receiving portion 18b may also be configured with a cutout as shown in FIGS. 2 and 3.

In addition, when the transfer charger 44 is provided removably with respect to the device main body 1, the charger 42
Instead, a transfer charger 44 may be used. Also,
Each moving body Sl.

It is sufficient that at least one reflective mirror S2 is configured.

<Effects of the Invention> As described above, according to the image forming apparatus of the present invention, the support shaft or charger for supporting the photoreceptor, which is detachable from the apparatus main body, is installed between the pair of side plates, and each Optical axis adjustment and perpendicularity adjustment of the moving object can be easily performed by aligning a predetermined part of the moving object, eliminating the need for special jigs for making such adjustments, reducing economic burden. This has the unique effect of eliminating the trouble of having to carry the jig with the service person.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing the optical system of a copying machine as an embodiment of the present invention, Fig. 2 is a schematic diagram showing the internal configuration of the copying machine, and Figs. 3 and 4 show other embodiments. FIG. 5 is a perspective view showing still another embodiment. DESCRIPTION OF SYMBOLS 1... Device main body, 18... Side plate, 18a... Support bearing part, 18b... Charger receiving part, 21... Light source, 22.23.24... Plane reflecting mirror, 25. ...Lens, 41...Photoreceptor, 41a...
Support shaft, 42... Charger, 44... Transfer charger,... First moving body, 2... Second moving body.

Claims (1)

[Claims] 1. A first moving body having a light source for illuminating a document and at least one reflecting mirror, and at least one reflecting mirror for guiding light from the reflecting mirror to a lens. In the image forming apparatus, the second movable body is arranged to be reciprocally movable between the pair of side plates, and the support shaft supporting the photoconductor is removable from the photoconductor and the device main body. An image forming apparatus characterized in that a side plate is provided with a support shaft receiving portion for being installed between the side plates in a state where the support shaft is orthogonal to the side plates. 2. A first moving body having a light source for document illumination and at least one reflecting mirror; and a second moving body having at least one reflecting mirror for guiding light from the reflecting mirror to a lens. In an image forming apparatus in which the charger is reciprocally movable between a pair of side plates and is removable from the apparatus main body, the charger is placed between the pair of side plates with the charger orthogonal to the side plates. An image forming apparatus characterized by being provided with a charger receiving section for installation.