JPH11109722A - Fixing mechanism for exposure device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fixing mechanism for an exposure device capable of improving the quality of multicolor printing. SOLUTION: This mechanism for adjusting the exposure device up and down and fixing it in an electrophotographic printing machine is equipped with a base plate 31 to which the exposure device is attached, a beam 32 fixed on a printing machine frame, and an up-and-down fixture 6 adjusting the base plate 31 in an up-and-down direction with respect to the beam 32 and fixing it, and provided with the upper spherical washer 11 and the lower spherical washer 13 of a fixing means by which bending force is not exerted on the base plate 31 at when fixing the base plate 31 by the fixture 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fixing mechanism for an exposure device in an electrophotographic printing machine.

[0002]

2. Description of the Related Art FIG. 4 is a schematic structural view of a conventional fixing mechanism of an exposure apparatus, FIG. 5 (a) is an enlarged cross-sectional view taken along line AA of FIG. 4, and FIG. FIG. 4 is an explanatory diagram exaggeratingly showing a case where a mounting beam 32 of the exposure apparatus and a base plate 31 of the exposure apparatus are not parallel. The electrophotographic printing machine forms a latent image by performing exposure corresponding to an image on the photosensitive drum 2 by an exposure device 3, attaches a toner (developer) to the latent image by a developing device 4, and transfers the image to a transfer device. At 5, it is configured to attract to the web 1 and transfer an image onto the web 1. In the case of a multi-color printing machine, the latent images drawn on the photosensitive drum 2 by the exposure devices 3 for each color have no distortion, and when they are superimposed on each other, the images of the respective colors must exactly match. The exposure device 3 performs exposure by scanning a laser beam, and it is necessary to mount the device with high accuracy.

The exposure apparatus 3 has a horizontal moving tool 7 for adjusting its front, rear, left and right directions, and an upper and lower fixing tool 6 for adjusting and fixing its height direction. The movement can be adjusted in each direction.
The upper and lower fixing devices 6 are provided at a plurality of locations (for example, three locations). Conventionally, as shown in FIG. 5, such an upper / lower fixture 6 is turned by an adjustment screw 12 with a flange which is adjusted by a spanner or the like, so that the exposure apparatus base plate 31 is fixed to the printing press frame. The base plate 31 is adjusted vertically with respect to the beam 32, and the base plate 31 is pressed against the adjusting screw 12 with the bolt 18, and is fixed to the mounting beam 32. At this time, when the exposure device mounting beam 32 and the exposure device base plate 31 are not parallel,
That is, when the heights of the plurality of adjusted upper and lower fixtures 6 are different from each other, as shown in FIG.
A gap S is created between the base 2 and the base plate 31. In this state, if the bolt 18 of the upper and lower fixing tool 6 is tightened, the gap S in the drawing is brought into close contact with the mounting beam 32 by an amount corresponding to the rigidity. The exposure apparatus base plate 31 is deformed.

[0004]

As described above, in the conventional fixing mechanism of the exposure apparatus, the exposure apparatus base plate is deformed by tightening the bolt, and this deformation affects the exposure accuracy. In this case, the print quality was adversely affected, for example, the images did not match and became unclear. The present invention has been made in view of such circumstances, and an object of the present invention is to provide a fixing mechanism of an exposure apparatus that can improve print quality of multicolor printing.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems of the prior art, the present invention relates to a vertical adjustment and fixing device for an exposure device in an electrophotographic printing machine, wherein a base plate for mounting the exposure device is provided. And, a beam fixed to the printing press frame, a horizontal moving tool for adjusting the base plate to the front, rear, left and right with respect to the beam, and a vertical fixing device for adjusting the vertical direction and fixing, The fixing means is provided so that no bending force is applied to the base plate when fixed.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on illustrated embodiments. Here, FIG. 1 is an explanatory view of a fixing mechanism of the exposure apparatus according to the first embodiment of the present invention,
(A) is a cross-sectional view of the upper and lower fixtures, and (b) is an exaggerated cross-sectional view of the upper and lower fixtures when the exposure apparatus mounting beam 32 and the exposure apparatus base plate 31 are not parallel. The upper and lower fixing tool 6 of the present embodiment has a shaft 10 with screw processing at both ends, and is fixed by screwing one end of the shaft 10 into a mounting screw hole 31 a of the exposure apparatus base plate 31. It has become. A convex spherical portion 10 ′ is provided at one end of the shaft 10 below a portion fixed to the base plate 31, and the other end can be tightened by a nut 16. Further, the electronic printing press is provided with a mounting beam 32 fixed to a printing press frame (not shown) in order to assemble the exposure device 3. An adjusting screw 12 for adjusting the height is screwed and attached to the mounting beam 32.
The above-mentioned shaft 10 is incorporated.

Therefore, the upper and lower fixtures 6 are connected to the base plate 31 on which the exposure device 3 (not shown) is mounted by attaching the exposure device mounting beam 32.
Is supported by a convex spherical portion 10 'so as to be fixed after height adjustment, and has a structure capable of coping with displacement. That is, the upper spherical washer 11 is disposed in contact with the upper part of the adjusting screw 12, and the convex spherical part 10 'of the shaft 10 is fitted to the concave spherical part 11' of the upper spherical washer 11. I have. A concave spherical portion 12 'is formed on the lower surface of the adjusting screw 12, and the convex spherical portion 13' of the lower spherical washer 13 is fitted into the concave spherical portion 12 '. The lower spherical washer 13 is
The washer 1 is secured by a nut 16 screwed to the other end of the washer 1.
4. It is to be tightened between the adjusting screw 12 and the spring washer 15. For this reason, the fixing means which does not apply a bending force to the base plate 31 when fixed by the upper and lower fixing members 6 is constituted by the upper spherical washer 11 and the lower spherical washer 13. The upper and lower fixtures 6 are provided in plural (for example, three) on one exposure apparatus base plate 31.

In the present embodiment, adjustment of the exposure apparatus 3 in the horizontal direction is performed by the horizontal moving tool 7, and adjustment in the height direction is performed by rotating the adjusting screw 12 of the upper and lower fixing tool 6 from the mounting beam 32. Adjusting the allowance. That is, FIG.
As shown in (a) and (b), the fixing plate 3 is attached to the mounting beam 32.
When the adjusting screw 33 rotatably attached thereto is rotated, a male screw 37 provided at the end thereof is attached.
As a result, the upper and lower fixture 6 moves right and left in the figure according to the rotation direction of the screw 33. Adjustment in the front-back direction
If adjustment is required using a fixed guide (not shown), a shim is inserted into the fixed guide for adjustment. In the drawing, 36 is a retaining ring provided on the adjusting screw 33, and 38 is a notch provided on the mounting beam 32. After the adjustment, the base plate 31 is fixed to the mounting beam 32 by turning the nut 16 and fixing the shaft 10 to the adjusting screw 12.

On the other hand, when the vertical adjustment is performed by the vertical fixing device 6, the exposure apparatus base plate 31 may not be parallel to the exposure apparatus mounting beam 32. At this time, since the shaft 10 is arranged at right angles to the base plate 31 and the adjusting screw 12 is arranged at right angles to the mounting beam 32, the axis of the shaft 10 and the axis of the adjusting screw 12 are parallel. And the mounting lower part is shifted by α in the horizontal direction. The present embodiment is configured so that even if there is such a deviation, a large distortion is not applied to the exposure apparatus base plate 31. That is, as shown in FIG. 1B, when the angle between the shaft 10 and the adjusting screw 12 is θ, the convex spherical portion 10 ′ of the shaft 10 is formed.
And the concave spherical portion 11 'of the upper spherical washer 11 and the adjusting screw 1
2 between the lower concave spherical portion 12 'and the convex spherical portion 13' of the lower spherical washer 13, the upper spherical washer 11 corresponding to the angle .theta. Can be supported, and the lower surface of the upper spherical washer 11 can contact the upper surface of the adjusting screw 12 without difficulty.

When the nut 16 screwed to the lower end of the shaft 10 is tightened, the convex spherical portion 13 ′ of the lower spherical washer 13 contacts the concave spherical portion 12 ′ of the adjusting screw 12. It becomes possible to tighten along the inclination of the shaft 10. That is, the spring washer 15 and the lower surface of the lower spherical washer 13 are tightened while being in contact with each other along the tightening surface 16 ′ of the nut 16. The hole 20 of the adjusting screw 12 and the hole 21 of the lower spherical washer 13 are formed in a size that is expected to deviate from the dimension α with respect to the dimension α that is displaced by the inclination of the shaft 10. Therefore, even if the shaft 10 is inclined, that is, the exposure apparatus base plate 3
Even if 1 is not parallel to the mounting beam 32 of the exposure apparatus, a force such as a bending force that exerts a large strain on the base plate 31 does not act. Thus, the exposure apparatus base plate 3
The exposure device 3 installed on the photosensitive drum 1 can draw an accurate image on the photosensitive drum 2 and can improve the print quality of multicolor printing (see FIG. 3).

FIGS. 3A and 3B are explanatory views of a fixing mechanism of an exposure apparatus according to a second embodiment of the present invention. FIG. 3A is a sectional view of an upper and lower fixture, and FIG. 31
FIG. 4 is an exaggerated cross-sectional view of the upper and lower fixing devices when the and are not parallel. The shaft 10 has a male screw 23 at the upper end, a convex spherical portion 10 'at the lower part, a male screw 23 at the lower part of the shaft 10, and a lower end to be operated with a spanner or the like. Corner portion 22 is provided. The male screw 23 at the upper end of the shaft 10 is screwed and fixed to the screw hole 31a of the base plate 31 of the exposure apparatus. Shaft 10
Is disposed through a hole 24 of an exposure device mounting beam 32 fixed to a printing press frame (not shown), and a shaft 10 is provided.
Gravity is applied to the exposure device mounting beam 32 via the upper spherical washer 11 having the concave spherical portion 11 'fitted to the convex spherical portion 10'. For this reason, the fixing means which does not apply a bending force to the base plate 31 when fixed with the vertical fixing tool 6
Upper spherical washer 11, spherical washer 17, and lower spherical washer 19
It is constituted by. The vertical adjustment of the base plate 31
This operation is performed by turning the shaft 10 by operating the corner portion 22 at the lower end of 0 with a spanner or the like, and screwing the male screw 23 into and out of the base plate 31. A flanged spherical washer 17 having a convex spherical portion 17 'is screwed into the male screw 23 of the shaft 10 projecting below the mounting beam 32, and a concave shape is provided between the spherical washer 17 and the mounting beam 32. A lower spherical washer 19 having a spherical portion 19 ';
A washer 14 and a spring washer 15 are interposed.

The second embodiment is different from the first embodiment in that the height is adjusted mainly at the screwing portion between the male screw 23 on the upper part of the shaft 10 and the exposure apparatus base plate 31.
There is no adjusting screw 12 of the embodiment, and the mounting beam 32 has the hole 2
4, the structure is different in that the shaft 10 passes through the hole 24. Functionally, it is the same as the first embodiment. That is, the inclination corresponds to the convex spherical portion 10 ′ of the shaft 10, the upper spherical washer 11, the lower spherical washer 19, and the spherical washer 17 with the flange.
The difference between the inner diameter of the hole 24 and the outer diameter of the shaft 10 is appropriately provided. Therefore, in the present embodiment, the number of components is smaller than in the first embodiment, and the cost can be reduced.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications and changes may be made without departing from the gist of the present invention. What you get.

[0014]

As described above, the fixing mechanism of the exposure apparatus according to the present invention is a mechanism for vertically adjusting and fixing the exposure apparatus in an electrophotographic printing machine. A beam fixed to the beam, and an upper and lower fixture for adjusting and fixing the base plate to the beam in the vertical direction, and a fixing means that does not apply a bending force to the base plate when the base plate is fixed with the upper and lower fixtures. Therefore, in a multi-color printing machine, it is possible to perform printing in which images of respective colors exactly match.

[Brief description of the drawings]

FIGS. 1A and 1B are explanatory views of a fixing mechanism of an exposure apparatus according to a first embodiment of the present invention, wherein FIG.
(B) is an exaggerated cross-sectional view of the upper and lower fixing devices when the exposure device mounting beam and the exposure device base plate are not parallel.

FIGS. 2A and 2B show details of a horizontal moving device, wherein FIG. 2A is a front view of a main part thereof, and FIG. 2B is a diagram of FIG.

3A and 3B are explanatory views of a fixing mechanism of an exposure apparatus according to a second embodiment of the present invention, wherein FIG.
(B) is an exaggerated cross-sectional view of the upper and lower fixing devices when the exposure device mounting beam and the exposure device base plate are not parallel.

FIG. 4 is a schematic structural view showing a fixing mechanism of a conventional exposure apparatus.

5A and 5B are cross-sectional views of the vertical adjustment / fixing portion of the exposure apparatus mounting base taken along the line AA in FIG. 4, wherein FIG. 5A is a cross-sectional view of the vertical fixing tool, and FIG. It is sectional drawing of the upper and lower fixing tool which exaggerates and shows when the apparatus base plate is not parallel.

[Description of Signs] 1 Web 2 Photosensitive drum 3 Exposure device 4 Developing device 5 Transfer device 6 Upper and lower fixtures 10 Shaft 10 'Convex spherical portion 11 Upper spherical washer 11' Concave spherical portion 12 Adjusting screw 12 'Concave spherical portion DESCRIPTION OF SYMBOLS 13 Lower spherical washer 13 'Convex spherical part 14 Washer 15 Spring washer 16 Nut 17 Spherical washer 17' Convex spherical part 19 Lower spherical washer 19 'Concave spherical part 20, 21, 24 hole 22 Corner part 23 Male screw 31 Exposure device base plate 32 Exposure device mounting beam 33 Adjusting screw 34 Fixing plate 36 Retaining ring 37 Male screw 38 Notch

Claims (3)

[Claims] 1. A mechanism for adjusting an exposure apparatus up and down and fixing the same in an electrophotographic printing machine, comprising: a base plate on which the exposure apparatus is mounted; a beam fixed to a printing press frame; A fixing mechanism for an exposure apparatus, comprising: an upper and lower fixing device for adjusting and fixing in an up-down direction, wherein fixing means for preventing a bending force from being applied to the base plate when fixed by the upper and lower fixing device. 2. The fixing means, comprising: an adjusting screw screwed to a beam; a shaft passing through the screw, having an upper portion attached to the base plate, and a lower portion having a fastener. 2. The device according to claim 1, further comprising an upper spherical washer interposed between the base plate and the beam, and a lower spherical washer interposed between the adjusting screw and the fastener. Fixing mechanism of exposure equipment. 3. The vertical fixing device includes a shaft extending through the beam, a male screw provided on an upper portion of the shaft and screwed to a base plate, and a fastener provided on a lower portion of the shaft. 2. The fixing means according to claim 1, wherein the fixing means includes an upper spherical washer interposed between the base plate and the beam, and a lower spherical washer interposed between the beam and the fastener. A fixing mechanism of the exposure apparatus according to claim 1.