JP3476369B2 - Image forming 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 image forming apparatus, and more particularly, to a running frame having an optical system for reading a document mounted on a running rail disposed below the document table and parallel to the document table. The present invention relates to a positioning unit for the traveling frame in an image forming apparatus that reciprocates.

[0002]

2. Description of the Related Art In a general copying machine, an original table is arranged on the upper surface of the main body of the apparatus, and a traveling system equipped with an optical system having a light source and a mirror is installed along a traveling rail below the original table. The frame is driven to reciprocate. Then, the original placed on the original table is illuminated by the light from the light source, and the reflected light is reflected by the mirror to form an image on the original table on the surface of the photosensitive drum, so that the original can be copied. It has become. The traveling frame is, specifically, an illumination unit frame having an illumination unit for irradiating the platen with light from a light source, and a reflection light of the illumination light from the illumination unit on the platen. A first frame having a moving first mirror for projection that projects in the sub-scanning direction, and a first moving frame for projection.
The second frame is equipped with moving second and third mirrors for projection which project the reflected light from the mirror in the direction of the projection lens.
Conventionally, when positioning these traveling frames, a reference hole or reference surface is provided in each of the first frame and the second frame, and a fixing hole is provided in a reference hole similarly provided in a side plate of the machine body, a traveling rail, or the like. The tool has been inserted or pressed separately in the reference holes or reference surfaces provided in the first frame and the second frame, respectively. Note that the lighting unit frame is conventionally positioned integrally with the first frame, and is not positioned by the lighting unit frame alone.

[0003]

In the above-mentioned conventional apparatus, if separate references are provided for the first frame and the second frame,
Multiple jigs are required before and after the machine body, and work time for mounting them is required for each frame. In addition, it is necessary to prevent the jigs from interfering with each other depending on their mounting positions, and it may be difficult to set the reference position of the machine body as short as possible from each frame. There were times when it ended up. Further, in this case, there are a plurality of reference holes or reference surfaces in the side plates, running rails, etc. in the front and rear of the machine body, and they have an error with each other, and as a result, the dimensional accuracy of the machine as a whole is reduced. Could have an adverse effect on. Further, with respect to the lighting unit frame, the mounting accuracy of the lighting unit frame affects the image. Therefore, it is necessary to position the lighting unit frame separately from the first frame. In order to solve the problems in the prior art, the present invention improves the image forming apparatus to shorten the traveling frame positioning work time, downsize and simplify the jig, and secure the positioning accuracy. It is an object of the present invention to provide an image forming apparatus capable of obtaining a good image.

[0004]

In order to achieve the above object, the present invention provides an illumination unit frame having an illumination unit for illuminating the platen with illumination light from a light source, and an illumination unit frame from this illumination unit. A first frame equipped with a movable first mirror for projection that projects the reflected light of the illumination light on the platen in the sub-scanning direction, and the reflected light from the movable first mirror for projection is projected in the direction of the projection lens. Projection movement 2nd, 3rd
In an image forming apparatus equipped with an exposure scanning mechanism having a second frame equipped with a mirror, the illumination unit frame and the first frame, the first frame and the second frame, or the illumination unit frame and the first frame. By providing a positioning hole at a position where the first frame and the second frame can overlap, and by penetrating the positioning hole with one jig that can be set at the reference position of the machine body, The first frame, the first frame and the second frame, or the illumination unit frame, the first frame, and the second frame are simultaneously positioned with respect to the machine body, and the image forming apparatus is configured. ing. In such a configuration, the lighting unit frame and the first frame, the first frame and the second frame, or the lighting unit frame and the first frame.
A jig that can be set at the reference position of the machine body is penetrated through a positioning hole provided at a position where the frame and the second frame can overlap each other, whereby the lighting unit frame, the first frame, and the above-mentioned The first frame and the second frame or the lighting unit frame, the first frame and the second frame are simultaneously positioned with respect to the machine body. Therefore, the work time can be shortened as compared with the case where a separate standard is set for each frame. Further, since there is no interference between jigs and the reference position of the machine body can be located at the shortest position as seen from any of the frames, it is possible to downsize and simplify the jig. Further, since only one reference position is required before and after the machine body, the dimensional accuracy of the entire machine is improved, and as a result, a good image can be obtained. Further, since the lighting unit frame, which has been conventionally positioned integrally with the first frame, can also be positioned independently, the mounting accuracy can be increased and a better image can be obtained.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the accompanying drawings to provide an understanding of the present invention.
The following embodiments are examples of embodying the present invention and are not of the nature to limit the technical scope of the present invention. 1 is a schematic cross-sectional view showing the schematic configuration around the exposure scanning mechanism as seen from the operating side of the copying machine according to the embodiment of the present invention, and FIG. 2 is a plan view showing the schematic configuration around the exposure scanning mechanism. 3 is a partially enlarged sectional view of the exposure scanning mechanism, FIG. 4 is a plan view showing a state where the lamp unit and the first frame are separated, and FIG. 5 is a plan view showing a state where the lamp unit and the first frame overlap. 6 is a perspective view showing the detailed structure of the positioning jig, FIG. 7 is a plan view in which the first frame and the second frame are separated, and FIG. 8 is a state in which the first frame and the second frame overlap. FIG. 9 is a plan view in which the lamp unit and the first frame and the second frame overlap.

As shown in FIGS. 1, 2 and 3, the copying machine according to the present embodiment (an example of an image forming apparatus) has a first frame on the lower surface side of a document table 1 on which an optical system unit is mounted. 2 and the second frame 3 are arranged. These first frame 2 and second frame 3
Are supported so as to be capable of reciprocating within 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. The first frame 2 and the second frame 3 are associated with each other via a wire (not shown) so as to move at a speed ratio of 2: 1. First frame 2
Is a lamp unit frame (corresponding to a lighting unit frame) in which a first mirror (corresponding to a moving first mirror for projection) 6 and the like are mounted on a frame body and further a lamp (corresponding to a light source) 5 and the like are provided.
It is equipped with 5a. Here, the first mirror 6 is the lamp 5
The light reflected by the first document is projected in the sub-scanning direction. The second frame 3 has a second mirror (corresponding to the moving second mirror for projection) 7 and a third mirror (corresponding to the moving third mirror for projection) 8 mounted on the frame. Here, the second mirror 7 and the third mirror 8 are for projecting the reflected light from the first mirror 6 onto a lens unit (corresponding to a projection lens). That is, these lamps 5,
The optical system unit is configured by the first mirror 6, the second mirror 7, the third mirror 8 and the like. On the optical path 10 from the optical system unit to the photoconductor drum 9, there is arranged a lens 11 for varying magnification which constitutes the above-mentioned lens unit. The movement is appropriately adjusted along the optical path to the fourth mirror 12, which will be described later. Also, the lens unit has a lens 1
In addition to 1, the fourth mirror 12, the fifth mirror 13, the sixth mirror 14 and the like are arranged.

In the copying machine of the present copying machine, at the time of copying operation, the lens 11 is first moved and adjusted in an appropriate direction according to a predetermined magnification. Then, 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 the moving speed corresponding to the scaling ratio, and the 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 in reverse, and the moving direction of the optical system unit is reversed. The inverted 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 projected image of the original document illuminated by the lamp 5 is
Mirror 6, second mirror 7, third mirror 8, lens 11,
The fourth mirror 12, the fifth mirror 13, and the sixth mirror 14 are projected in this order to form an image, and the photosensitive drum 9 is irradiated with the image. As a result, an electrostatic latent image corresponding to the original image is formed on the surface of the photosensitive drum 9, and the electrostatic latent image is developed into a visible image. The image visualized on the photoconductor drum 9 is transferred onto a sheet and subjected to a fixing process, and then discharged outside the machine.

The quality of the image obtained in this way largely depends on the accuracy of the mounting position of each frame constituting the optical system unit. Therefore, in this copying machine, positioning of each frame is performed by either of the following. did. (Positioning of Lamp Unit and First Frame) As shown in FIG. 2, FIG. 3 and FIG. 4, both ends of the first frame 2 are bent in a stepwise downward shape, and are attached to the lower surfaces of the paragraphs 2a, 2a. The slider portions 15, 15 mounted along the rails are in contact with the traveling rails 4, 4 in front of and behind the machine body 1a. In addition, a circular hole 2b for positioning is provided in front of one of the paragraphs 2a.
One is formed, and in front of the other paragraph 2a,
One elongated hole 2c for positioning is formed. The longitudinal direction of the elongated hole 2c is the longitudinal direction of the frame, that is, the machine body 1
It is in the front-back direction of a, and its frame is the traveling rails 4, 4
The front-back distortion of the machine body 1a due to the weight of the first frame 2 and the like when bridged in between can be absorbed here. However, in the direction perpendicular to the longitudinal direction of the elongated hole 2c, it has the same diameter as the round hole 2b in order to perform positioning in that direction. On the other hand, both end portions of the lamp unit frame 5a are also bent in a stepwise downward shape, and the round hole 2 for positioning the first frame 2 of the paragraph portion 5b on one side thereof is formed.
A circular hole 5c for positioning is formed at a position corresponding to b, and a positioning circular hole 5c is formed at a position of the other paragraph 5b corresponding to the elongated hole 2c for positioning of the first frame 2. One long hole 5d is formed. For the same reason as in the case of the first frame 2, the longitudinal direction of the elongated hole 5d is the front-back direction of the machine body, and the direction perpendicular to the longitudinal direction has the same diameter as the round hole 5c. The paragraphs 5b and 5b at both ends of the lamp unit frame 5a are placed in front of the paragraphs 2a and 2a at both ends of the first frame 2, respectively. In FIG. 5, the paragraphs 5b and 5b at both ends of the lamp unit frame 5a are placed in front of the paragraphs 2a and 2a at both ends of the first frame 2 so that the lamp unit frame 5a is placed in the first frame 2 In this state, the round hole 5c of the lamp unit frame 5a overlaps the round hole 2b of the first frame 2 and the long hole 5d of the lamp unit frame 5a is shown.
Overlaps with the elongated hole 2c of the first frame 2.

In this way, with the lamp unit frame 5a and the first frame 2 being overlapped with each other, the jig 1 is formed from the notches 1b and 1b formed at the reference positions before and after the machine body 1a.
6 is inserted into the respective positioning holes 2b, 2c, 5c, 5d of the lamp unit frame 5a and the first frame 2 to position the lamp unit frame 5a and the first frame 2 at the same time. The jig 16 used at this time is, as shown in FIG.
The support portion 16a has a triangular shape in a plan view and has a screw hole and a protrusion for being set to a, and a stepped rod portion 16b extending from the support portion 16a. The rod portion 16b includes the lamp unit frame 5a and the first frame. 2 of the positioning holes 2b, 2c, 5c and 5d. In such a configuration, the positioning holes 2b, 2c, which are provided at the positions where the lamp unit frame 5a and the first frame 2 can overlap,
The jigs 16 that can be set at the reference positions before and after the machine body 1a are penetrated through 5c and 5d, whereby the lamp unit frame 5a and the first frame 2 are simultaneously positioned with respect to the machine body 1a. Therefore, the work time can be shortened as compared with the case where a separate standard is set for each frame. Further, since there is no interference between the jigs and the reference position of the machine body 1a can be located at the shortest position as seen from any of the frames, the jigs can be downsized and simplified. Also, since one reference position is required before and after the machine body 1a,
The dimensional accuracy of the entire machine is improved, and as a result, good images can be obtained. Furthermore, since the lamp unit frame 5a, which has been conventionally positioned integrally with the first frame 2, can also be positioned independently, the mounting accuracy can be increased and a better image can be obtained.

(Positioning of the first frame and the second frame) FIGS. 2 and 3
As shown in FIG. 7 and FIG. 7, both ends of the second frame 3 are bent in an upward staircase shape, and the machine body 1 is attached by the slider parts 17 attached along the lower surfaces of the paragraph parts 3a, 3a.
a It is in contact with the front and rear traveling rails 4, 4. In addition, one positioning round hole 3b is formed at a position corresponding to the positioning round hole 2b of the first frame 2 in front of the one paragraph 3a, and the positioning of the other paragraph 3a is performed. One positioning long hole 3c is formed at a position corresponding to the positioning long hole 2c of the first frame 2 on the front side. This long hole 3
For c, for the same reason as in the case of the first frame 2 above,
The longitudinal direction is the front-back direction of the machine body, and the longitudinal direction and the direction perpendicular to the machine body have the same diameter as the round hole 5c. The configuration of the first frame 2 is as described above. This first frame 2
The slider parts 15, 15 of the second frame 3 are the slider parts 17,
The first frame 2 can pass above the second frame 3 without interfering with each other because the first frame 2 passes through the outside of the frame 17. FIG. 8 shows a state in which the first frame 2 overlaps with the second frame 3, and in this state, the round hole 2 of the first frame 2
b overlaps with the round hole 3b of the second frame 3, and the elongated hole 2 of the first frame 2
c overlaps the elongated hole 3c of the second frame 3. In this way, with the first frame 2 and the second frame 3 being overlapped with each other, the notch 1 formed at the reference position before and after the machine body 1a.
From b and 1b, the jig 16 as described above is attached to the first frame 2 and the second frame.
The first frame 2 and the second frame 3 are simultaneously positioned by being inserted into the respective positioning holes 2b, 2c, 3b, 3c of the frame 3.
In such a configuration, positioning holes 2b, 2c, which are provided at the positions where the first frame 2 and the second frame 3 can overlap,
The jigs 16 that can be set at the reference positions before and after the machine body 1a are penetrated through 3b and 3c, whereby the first frame 2
And the second frame 3 is simultaneously positioned with respect to the machine body 1a. Therefore, the work time can be shortened as compared with the case where a separate standard is set for each frame. Further, since there is no interference between the jigs, the reference position of the machine body 1a can be taken in the shortest position from any of the frames,
It is possible to downsize and simplify the jig. In addition, the machine body 1
Since only one reference position is required before and after a, the dimensional accuracy of the entire machine is improved, and as a result, a good image can be obtained.

(Positioning of Lamp Unit Frame, First Frame and Second Frame) The structure of each frame is as described above. 2, 3 and 9 show a state in which the lamp unit frame 5a and the first frame 2 overlap the second frame 3, and in this state, the round hole 5c of the lamp unit frame 5a is The round hole 2b of the first frame 2 and the round hole 3b of the second frame 3 overlap, and the long hole 5d of the lamp unit frame 5a overlaps the long hole 2c of the first frame 2 and the long hole 3c of the second frame 3. . With the lamp unit frame 5a, the first frame 2, and the second frame 3 being overlapped in this manner, the jigs as described above are formed from the cutouts 1b, 1b formed at the reference positions before and after the machine body 1a. 16 are inserted into the respective positioning holes 5c, 5d, 2b, 2c, 3b, 3c of the lamp unit frame 5a, the first frame 2 and the second frame 3, and the lamp unit frame 5a, the first frame 2 and the second frame Position 3 simultaneously. With such a configuration, the positioning holes 5c, 5d, 2b, 2 provided in the lamp unit frame 5a, the first frame 2, and the second frame 3 at the positions where they can overlap each other.
The jigs 16 that can be set at the reference positions before and after the machine body 1a are pierced through c, 3b, and 3c, whereby the lamp unit frame 5a, the first frame 2, and the second frame 3 are connected to the machine body 1a.
Are simultaneously positioned with respect to. Therefore, the work time can be shortened as compared with the case where a separate standard is set for each frame. Further, since there is no interference between the jigs and the reference position of the machine body 1a can be located at the shortest position as seen from any of the frames, the jigs can be downsized and simplified. In addition, since the reference position of the machine body only needs to be one before and after the machine body, the dimensional accuracy of the entire machine is improved,
As a result, a good image can be obtained. further,
Since the lamp unit frame 5a, which has been conventionally positioned integrally with the first frame 2, can also be positioned independently, the mounting accuracy can be increased and a better image can be obtained.

[0012]

As described above, according to the present invention,
The work time can be shortened compared to the case where separate standards are set for each frame. Further, since there is no interference between jigs and the reference position of the machine body can be located at the shortest position as seen from any of the frames, it is possible to downsize and simplify the jig. Also, since one reference position is required before and after the machine body, the dimensional accuracy of the machine as a whole is improved,
As a result, a good image can be obtained. further,
Since the positioning of the lighting unit frame, which has been conventionally positioned integrally with the first frame, can also be performed independently, the mounting accuracy can be increased and a better image can be obtained.

[Brief description of drawings]

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

FIG. 2 is a plan view showing a schematic configuration around an exposure scanning mechanism.

FIG. 3 is a partially enlarged sectional view of an exposure scanning mechanism.

FIG. 4 is a plan view showing a state in which the lamp unit and the first frame are separated from each other.

FIG. 5 is a plan view showing a state in which the lamp unit and the first frame overlap each other.

FIG. 6 is a perspective view showing a detailed structure of a positioning jig.

FIG. 7 is a plan view showing a state in which the first frame and the second frame are separated from each other.

FIG. 8 is a plan view showing a state where the first frame and the second frame overlap each other.

FIG. 9 is a plan view showing the lamp unit, the first frame, and the second frame overlapping each other.

[Explanation of symbols]

1 ... Platen 1a ... Machine body 2 ... First frame 2b ... Round hole (corresponding to positioning hole) 2c ... Oval hole (corresponding to positioning hole) 3 ... second frame 3b ... Round hole (corresponding to positioning hole) 3c ... Oval hole (corresponding to positioning hole) 4 ... Running rail 5a ... Lamp unit frame (corresponding to illumination unit frame) 3c ... Round hole (corresponding to positioning hole) 3d ... elongated hole (corresponding to positioning hole) 16 ... Jig

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Katsuhiro Higashiya 1-2-2 Tamatsukuri, Chuo-ku, Osaka-shi, Osaka Mita Industry Co., Ltd. (56) Reference JP-A-10-98567 (JP, A) JP SHO 61-77834 (JP, A) Actual Kaihei 2-24841 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) G03B 27 / 50,27 / 54

Claims (3)

(57) [Claims] 1. An illumination unit frame having an illumination unit for illuminating illumination light from a light source onto an original table by an illumination mirror, and reflected light of the illumination light from the illumination unit on the original table in the sub-scanning direction. A first frame equipped with a movable first mirror for projection for projecting, and a second frame equipped with movable second and third mirrors for projection for projecting reflected light from the movable first mirror for projection in the direction of the projection lens. In an image forming apparatus equipped with an exposure scanning mechanism having the above, a positioning hole is provided at a position where the illumination unit frame and the first frame can overlap, and the positioning hole can be set at the reference position of the machine body. An image forming apparatus characterized in that the lighting unit frame and the first frame are simultaneously positioned with respect to the machine body by penetrating the positioning hole with one jig. 2. An illumination unit frame having an illumination unit for illuminating illumination light from a light source onto an original table by an illumination mirror, and reflected light of the illumination light from the illumination unit on the original table in the sub-scanning direction. A first frame equipped with a movable first mirror for projection for projecting, and a second frame equipped with movable second and third mirrors for projection for projecting reflected light from the movable first mirror for projection in the direction of the projection lens. In an image forming apparatus equipped with an exposure scanning mechanism including the above, a positioning hole is provided at a position where the first frame and the second frame can overlap with each other, and the positioning hole can be set at a reference position of the machine body. An image forming apparatus characterized in that the first and second frames are simultaneously positioned with respect to the machine body by penetrating the positioning hole with one jig. 3. An illumination unit frame equipped with an illumination unit that illuminates illumination light from a light source onto an original table by an illumination mirror, and reflected light of the illumination light from the illumination unit on the original table in the sub-scanning direction. A first frame equipped with a movable first mirror for projection for projecting, and a second frame equipped with movable second and third mirrors for projection for projecting reflected light from the movable first mirror for projection in the direction of the projection lens. In an image forming apparatus equipped with an exposure scanning mechanism having the above, a positioning hole is provided at a position where the illumination unit frame, the first frame and the second frame can overlap, and a reference position of the machine body is provided. An image forming apparatus characterized in that the lighting unit frame and the first and second frames are simultaneously positioned with respect to the machine body by penetrating the positioning hole with one settable jig.