JP2000047337A - Exposure scanning mechanism for image forming device and adjustment method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an excellent image by adjusting a traveling frame so as to become in parallel with an image forming part without using a large-scale jig or the like. SOLUTION: By this mechanism and an adjusting method thereof, a second frame 3 on which an exposure scanning unit is loaded is made to travel back and forth on a traveling rail by respectively pulling pulleys 17 and 17 freely rotatably fitted to the both end parts of the frame 3 in the traveling direction of the frame 3 by using wires 5a and 5b. In this case, by making the fitting position of at least one out of the pulleys 17 and 17 possible to be adjusted in the pulling direction of the wires 5a and 5b on the frame 3, the traveling frame is adjusted so as to become in parallel with the image forming part without using a large-scale jig or the like. Thus, the excellent image is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image forming apparatus, and more particularly, to pulleys rotatably attached to both ends of a traveling frame on which an exposure scanning unit is mounted by wires in the traveling direction of the traveling frame. By pulling each,
The present invention relates to an exposure scanning mechanism of an image forming apparatus that reciprocates the traveling frame on a traveling rail, and a method of adjusting the same.

[0002]

2. Description of the Related Art In a general copying machine, a document table is arranged on an upper surface of a machine body, and a first frame on which a light source is mounted and a mirror are mounted along a traveling rail on a lower surface of the document table. The driven second frame is reciprocally driven in association with each other. Then, the original placed on the original table is irradiated with the light from the light source, and the reflected light is reflected by a mirror to form an image on the surface of the photosensitive drum or the CCD, thereby enabling the original to be copied. ing. Pulleys are rotatably mounted on both ends of the second frame, respectively.
By pulling the pulley with a wire in the traveling direction of the second frame, the second frame reciprocates on the traveling rail. Conventionally, in order to make the second frame parallel to the photosensitive drum or the CCD, the pulling force of the wire engaged with the second frame is changed before and after the machine body, or the wire is applied to the machine body. The method of changing the fixed position before and after the machine body was adopted.

[0003]

SUMMARY OF THE INVENTION Among the above conventional methods,
In the method in which the pulling force of the wire engaged with the second frame is changed before and after the machine main body, the vibration at the wire engaging portion of the second frame differs before and after the machine main body, which may adversely affect the image. was there. On the other hand, the method of changing the fixing position of the wire to the machine main body before and after the machine main body requires a large jig for making the second frame parallel to an image forming unit such as a photosensitive drum or a CCD. The present invention improves the image forming apparatus to solve such problems in the conventional technology, and adjusts the traveling frame so as to be parallel to the image forming unit without using a large jig or the like. It is an object of the present invention to provide an image forming apparatus capable of obtaining a good image.

[0004]

According to a first aspect of the present invention, a pulley rotatably mounted on each of both ends of a traveling frame on which an exposure scanning unit is mounted is mounted in a traveling direction of the traveling frame. In the exposure scanning mechanism of the image forming apparatus, in which the traveling frame is reciprocated on the traveling rail by pulling the traveling frame on the traveling rail, the mounting position of at least one of the pulleys is set in the pulling direction of the wire on the traveling frame. It is configured as an exposure scanning mechanism of an image forming apparatus characterized in that it can be adjusted. With such a mechanism, if the mounting position of at least one of the pulleys at both ends of the traveling frame is adjusted in the pulling direction of the wire on the traveling frame, the pulling force of the wire applied to the pulleys at both ends of the traveling frame can be adjusted. Is substantially the same before and after the machine body, so that the traveling frame is parallel to the image forming unit, and the traveling frame moves smoothly on the traveling rail.
Further, in this case, a large jig for making the traveling frame parallel to the image forming unit is not required, so that the cost is reduced. As a result, it is possible to obtain a good image by adjusting the traveling frame so as to be parallel to the image forming unit without using a large jig or the like. In the second invention,
An image forming apparatus that reciprocates the traveling frame on a traveling rail by pulling pulleys rotatably attached to both ends of a traveling frame on which an exposure scanning unit is mounted, respectively, in a traveling direction of the traveling frame with wires. In the adjusting method of the exposure scanning mechanism, at least one of the pulleys is slidable in the pulling direction of the wire with respect to the traveling frame, and then the pulley is moved at a position where the pulling force of the wire is balanced. The present invention is configured as a method for adjusting an exposure scanning mechanism of an image forming apparatus, wherein the exposure scanning mechanism is fixed on a traveling frame. With such a method, the exposure scanning mechanism of the image forming apparatus according to the first aspect can be adjusted.

[0005]

Embodiments of the present invention will be described below with reference to the accompanying drawings to provide an understanding of the present invention.
It should be noted that the following embodiments are examples embodying the present invention, and do not limit the technical scope of the present invention. Here, FIG. 1 is a schematic cross-sectional view showing a schematic configuration around an exposure scanning mechanism viewed from the operation side of the copying machine according to the embodiment of the present invention, and FIG. 2 is a schematic configuration around a wire engaging portion of a second frame. 3A is a plan view, FIG. 3B is a vertical sectional view, FIG. 3C is a side sectional view of a pulley on a second frame as viewed from the operation side of the copying machine, and FIG. FIG. 3 is an enlarged plan view of a part around the pulley on the two frames, and FIG. 3 is an explanatory view showing a wire engaged state.

As shown in FIG. 1, a copying machine (an example of an image forming apparatus) according to the present embodiment has a first frame 2 and a second frame 3 (in which an optical system unit is mounted) on the lower surface of a document table 1. Both of them are equivalent to a traveling frame). The first frame 2 and the second frame 3 are provided in a predetermined area (not shown) between the origin position and the return position on the traveling rail 4 arranged in parallel with the document table 1.
It is supported to be able to reciprocate within. The first frame 2 and the second frame 3 are associated with each other via wires 5a and 5b (see FIGS. 2 and 3) so as to move at a speed ratio of 2: 1. The first frame 2 includes a lamp unit such as a lamp 5 and a first mirror 6 on a frame, and the second frame 3 includes a second mirror 7 and a third mirror on the frame. 8 and other mirror units. That is, the lamp unit and the mirror unit constitute the optical system unit. Further, on an optical path 10 extending from the optical system unit to the photosensitive drum 9, there is disposed a variable-magnification lens 11 constituting a lens unit, and the lens 11 moves along the optical path 10 according to the image forming magnification. The movement is adjusted appropriately. In the lens unit, in addition to the lens 11, a fourth mirror 12, a fifth mirror 13, a sixth mirror 14, and the like are arranged.

In this copying machine, during a copying operation, first, the lens 11 is moved and adjusted in an appropriate direction according to a predetermined magnification. When a motor (not shown) is turned on, the rotation of the photosensitive drum 9 is started, and at the same time, the optical system unit starts scanning at a moving speed corresponding to the magnification, and exposure by the lamp 5 is performed. . That is, when the first frame 2 of the optical system unit that has started moving from the origin position reaches the return position, the motor is driven to rotate in the reverse direction, and the moving direction of the optical system unit is reversed. The reversed optical system unit moves toward the stop position, the motor is turned off, and the optical system unit is stopped at the origin position. By such scanning, the original image irradiated by the lamp 5 is arranged in the order of the first mirror 6, the second mirror 7, the third mirror 8, the lens 11, the fourth mirror 12, the fifth mirror 13, and the sixth mirror 14. An image is formed and irradiated on the photosensitive drum 9. As a result, an electrostatic latent image is formed on the surface of the photosensitive drum 9, and the electrostatic latent image is developed into a visible image by developing. The visible image on the photosensitive drum 9 is transferred to a sheet, subjected to a fixing process, and then discharged outside the apparatus.

Hereinafter, the configuration around the wire engaging portion of the second frame, which is a feature of the copying machine, will be described in detail. In this copying machine, as shown in FIGS. 2 and 3, a first frame 2 and a second frame 3 are provided.
The two opposing sides of the two wires 5a, 5a,
5b. One end of the wire 5 a arranged at the rear of the machine body 15 is fixed to the machine body 15 by a clamp 16. The wire 5a extending from the fixing portion is hung on one groove of a pulley 17 having a double groove and rotatably attached to the second frame 3. Here, the wire 5 a whose direction is changed by 180 degrees is fixed to the first frame 2 by the clamp 18. Further, the wire 5a is wound in a helical shape around the motor-driven drum 20 by changing the direction by 180 degrees by the pulley 19, and is taken in or taken out from here.
The wire 5a fed out or taken in from the drum 20 is turned 180 degrees by the pulley 21 and is hooked on the other groove of the pulley 17 having a double groove and rotatably attached to the second frame 3. Can be Here, the wire 5 a whose direction is changed by 180 degrees is fixed to the machine body 15 by the clamp 22. Here, the pulley 17 is
Wires 5 hung in opposite directions in each of the grooves
The pulley 17 is pulled in the direction in which the second frame 3 reciprocates, and the mounting position of the pulley 17 can be adjusted on the second frame 3 in the direction in which the wire 5a is pulled.
That is, in FIGS. 2A to 2D, the pulley 17 is rotatably mounted on the second frame 3 on the adjustment plate 17a which is a support portion thereof. The adjusting plate 17a is mounted on the end of the second frame 3, and is provided with a screw so that the position of the pulley 17 can be adjusted in the pulling direction of the wire 5a (P direction or Q direction in FIG. 2D). 17b, a long hole 17 through which 17b passes
c, 17c are formed. Since the configuration around the wire 5b engaging portion disposed at the front portion of the machine main body 15 is the same as the configuration around the wire 5a engaging portion disposed at the rear portion of the machine body 15, the description thereof is omitted. I do. However, the mounting position of the pulley 17 only needs to be adjustable at either the front part or the rear part of the machine body 15. In such a configuration, since the pulley 17 functions as a moving pulley, the amount of movement of the second frame 3 to which the pulley 17 is attached
a, the first frame 2 directly fixed to the 5b by the clamp 18
Of the first frame 2 and the second frame as described above.
The frame 3 can be moved at a speed ratio of 2: 1.

The adjustment of the exposure scanning mechanism having such a configuration is performed as follows. First, FIGS. 2 (a) to 2 (d)
In the above, the screws 17b, 17b fixing the adjustment plate 17a of the pulley 17 on the second frame 3 are loosened, so that the pulley 17 can slide on the second frame 3 in the pulling direction of the wire 5a. Then, the pulling force of the wire 5a on the pulley 17 causes the pulley 17 to
Slides alone in the direction of pulling. The above-described sliding is allowed in the long hole 17c. Eventually, the pulley 17 stops at a position where the pulling force of the wire 5a is balanced. At this position, the screws 17b and 17b are tightened to adjust the adjustment plate 17a of the pulley 17.
Is fixed on the second frame 3, the adjustment of the mounting position of the pulley 17 is completed. As described above, if the mounting position of at least one of the pulleys 17 at both ends of the second frame 3 is adjusted in the pulling direction of the wire 5a on the second frame 3, the variation in the pulling force of the wire 5a is almost eliminated. And the wire 5 on the pulleys 17 at both ends of the second frame 3
Since the pulling force a is substantially the same before and after the machine body 15, the second frame 3 is parallel to the image forming unit such as the photosensitive drum or the CCD, and the movement of the second frame 3 on the running rail 4 is performed. Becomes smooth. Further, in this case, a large jig for making the second frame 3 parallel to the image forming portion such as the photosensitive drum or the CCD becomes unnecessary, so that the second frame 3 becomes unnecessary.
It also reduces costs. As a result, it is possible to obtain a good image by adjusting the second frame so as to be parallel to the image forming unit without using a large jig or the like. Although the above-described embodiment relates to a copying machine, the present invention can be applied to any other image forming apparatus such as a printer and a facsimile.

[0010]

In the adjustment of the exposure scanning mechanism of the above embodiment, the second frame 3 is positioned with respect to the apparatus body 15 after the pulley 17 has stopped at a position where the pulling force of the wire 5a is balanced. The second frame 3 is almost completely parallel to an image forming unit such as a photosensitive drum or a CCD. By making the positioning reference common to the positioning of the entire machine, the mechanical dimensions can be accurately obtained.

[0011]

As described above, according to the present invention,
If the mounting position of at least one of the pulleys at both ends of the traveling frame is adjusted in the direction in which the wire is pulled on the traveling frame, the pulling force of the wire applied to the pulleys at both ends of the traveling frame can be adjusted before and after the machine body. Since they are almost the same, the traveling frame is parallel to the image forming unit, and the traveling frame moves smoothly on the traveling rail. Further, in this case, a large jig for making the traveling frame parallel to the image forming unit is not required, so that the cost is reduced. As a result, it is possible to obtain a good image by adjusting the traveling frame so as to be parallel to the image forming unit without using a large jig or the like.

[Brief description of the drawings]

FIG. 1 is a schematic cross-sectional view showing a schematic configuration around an exposure scanning mechanism as viewed from an operation side of a copying machine according to an embodiment of the present invention.

FIG. 2 is a plan view, a vertical sectional view, a side sectional view of the pulley on the second frame as viewed from the operation side of the copying machine, and a pulley on the second frame showing a schematic configuration around a wire engaging portion of the second frame. FIG.

FIG. 3 is an explanatory diagram showing a wire engagement state.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Original platen 2 ... 1st frame (equivalent to a travel frame) 3 ... 2nd frame (equivalent to a travel frame) 4 ... Travel rail 5a, 5b ... Wire 17 ... Pulley

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Katsuhiko Okamoto, Inventor Katsuhiko Okamoto 1-2-28, Chuo-ku, Osaka-shi, Mita Kogyo Co., Ltd. No. 28 Mita Industry Co., Ltd. F-term (reference) 2H071 AA27 DA02 2H076 AB11 AB18 EA04 EA11 EA24 2H108 AA01 FB62 FB75 HA07

Claims (2)

[Claims] 1. A traveling frame on which an exposure scanning unit is mounted is pulled by pulleys respectively rotatably attached to both ends of a traveling frame with wires in the traveling direction of the traveling frame, thereby reciprocating the traveling frame on a traveling rail. In the exposure scanning mechanism of the image forming apparatus to be run, the mounting position of at least one of the pulleys can be adjusted in the pulling direction of the wire on the traveling frame. mechanism. 2. The traveling frame is reciprocated on a traveling rail by pulling pulleys rotatably attached to both ends of a traveling frame on which an exposure scanning unit is mounted, respectively, in a traveling direction of the traveling frame with wires. In the method for adjusting an exposure scanning mechanism of an image forming apparatus to be run, at least one of the pulleys is slidable in the pulling direction of the wire with respect to the running frame, and then the pulling force of the wire is reduced. A method for adjusting an exposure scanning mechanism of an image forming apparatus, wherein the exposure scanning mechanism is fixed on the traveling frame at a position where the balance is performed.