JPH0339762A - Non-picture part exposing device for copying machine - Google Patents

Abstract

PURPOSE:To move a light shielding member in the width direction of a photosensitive body by a prescribed amount with a simple constitution by providing a member, which movably supports a lens, with a cam part possessing a prescribed curvature, and directly pushing a cam follower with the cam member. CONSTITUTION:An erasing lamp 23 is provided so that it faces a photosensitive body 21 and extends in the width direction thereof; the light shielding member 8 is equipped between a device and the photosensitive body 21 so that it can move in the width direction of the photosensitive body and also the cam follower 12 is provided on the light shielding member 8. Moreover, the member which movably supports the lens 28e is provided with the cam member possessing the curvature and abutting on the cam follower 12. Therefore, when the image-forming lens 28e is moved in the direction of the photosensitive body 21 viewing from an optical axis at the time of carrying out reduction-copying, the curvature part of the cam member abuts on the cam follower 12, and the movement of the lens in the direction of an optical axis is converted to the movement of the cam follower 12 in the width direction of the photosensitive body. This movement of the cam follower 12 is transmitted to the light shielding member 8 directly or through a pulley or a wire. Thus, the light shielding member 8 moves from the edge part toward a center direction in the width direction of the photosensitive body 21 by the prescribed amount.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a copying machine, and more particularly to a non-image area exposure device that exposes a non-image area on a photoreceptor to eliminate unnecessary charges.

[Conventional technology]

For example, in an electrophotographic copying machine, the surface of a drum-shaped photoreceptor is uniformly charged over its entire width by a charger, and then exposed to original light to form an electrostatic latent image on the photoreceptor. After this electrostatic latent image is developed with toner, it is transferred onto paper by a transfer device.

In such a copying machine, when performing reduction copying, the photoreceptor is partially exposed in the width direction. Therefore, the charge in the unexposed area, that is, the non-image area remains, and toner adheres to the non-image area during the development process. Therefore, there is a problem that toner is wasted.

Therefore, depending on the copying magnification, the non-image area is
Electric charge is removed by exposure using a light source different from the light source for light. This static elimination process for the non-image area is called erasing. In a copying machine having an arbitrary magnification, the amount of erasure needs to be continuously changed according to the magnification.

For this reason, it is known that a light emitting diode array or the like consisting of a plurality of light emitting diodes extending in the width direction of the photoreceptor is provided, and the light is extinguished by lighting only the light emitting diodes in a width portion corresponding to the magnification. There is.

However, the light emitting diode array used for this extinction requires a large number of light emitting diodes to accommodate each magnification, and also requires a circuit to individually control the blinking of each light emitting diode. For this reason, there was a problem in that the erasing device became very expensive.

Therefore, as disclosed in Japanese Utility Model Application Publication No. 63-4557, etc., it has been proposed to control the amount of erasure mechanically. The copying machine described in the publication is provided with a pre-exposure lamp that emits light over the entire width of the photoreceptor, and a slit that serves as a light-shielding member that moves in front of the pre-exposure lamp in conjunction with a lens stand that moves according to the magnification. It is set up.

[Problem to be solved by the invention]

However, the device disclosed in the above-mentioned publication requires a complicated configuration in order to link the slit with the movement of the lens stand. That is, a rack section is provided on the side surface parallel to the moving direction of the lens stand, and the first gear is meshed with this rack section to convert the linear motion of the lens stand into circular motion, and the first gear has a larger number of teeth. By meshing the second gear to convert the amount of rotation, and meshing the slit rack with a third gear provided coaxially with the second gear, the rotational motion is again converted into linear motion of the slit.

In this way, in order to link the slit with the movement of the lens stand, a complicated horizontal diaphragm consisting of a rack section, first gear, second gear, third gear, slit rack, etc. is required, which increases manufacturing costs. At the same time, failures are more likely to occur.

The present invention was devised to solve the above problems, and an object of the present invention is to link the light shielding member with the movement of the lens support member using a simple horizontal diaphragm.

C Means for Solving the Problem] In order to achieve the above object, the non-image area exposure device for a copying machine of the present invention provides a copying machine that performs variable magnification copying by moving the position of an imaging lens. A extinction lamp is provided facing the photoreceptor and extending in the width direction of the photoreceptor, and a light shielding member movable in the width direction of the photoreceptor is provided between the extinction lamp and the photoreceptor, and the light shielding member is provided. It is characterized in that a member 1 and a cam follower are provided, and a cam member that has a curved surface shape and comes into contact with the cam follower is provided on the member that movably supports the lens.

Further, a wire is stretched between the light shielding member and a fixed part on the copying machine main body side via a pulley, a cam follower is provided that moves integrally with the pulley, and a cam follower is provided that moves integrally with the pulley, and a member that movably supports the lens is provided. A cam member having a curved surface shape and abutting on the cam follower may also be provided.

Further, the curved surface shape is characterized in that it has a function that converts a moving distance of the lens according to zooming into a width of a non-image area on the photoreceptor.

[Effect]

For example, when performing reduction copying, when the imaging lens is moved toward the photoreceptor when viewed from the optical axis, the curved portion of the cam member provided on the member that supports the lens comes into contact with the cam follower, causing the lens to move toward the photoreceptor. The movement of the cam follower in the direction of the optical axis is converted into the movement of the cam follower in the width direction of the photoreceptor. This movement of the cam follower is transmitted to the light shielding member directly or via a pulley and wire, and the light shielding member moves by a predetermined amount in the width direction of the photoreceptor from the end toward the center. Therefore, a part of the light from the extinguishing lamp is irradiated onto the photoreceptor without being blocked by the light shielding member, and the electric charge generated in the non-image area according to the shrinkage ratio is eliminated.

〔Example〕

DETAILED DESCRIPTION OF THE INVENTION Hereinafter, features of the present invention will be specifically described based on examples with reference to the drawings.

FIG. 1 is a schematic sectional view of a copying machine to which the non-image area exposure device of the present invention is applied, FIG. 2 is a diagram for explaining the optical system during variable magnification copying in the same copying machine, and FIG. 3 is a diagram showing the same copying machine. FIG. 3 is a diagram for explaining an exposure area on a photoreceptor during variable-magnification copying in a machine.

In FIG. 1, a charger 22. Extinguishing lamp 23. Developing device 24. Transfer device 25. Peeler 26. Cleaning device i! 27 etc. are arranged in sequence. And the photoreceptor 21
After the surface is uniformly charged over the entire width by the charger 22, the extinguishing lamp 23 is charged by a predetermined width according to a preset magnification, that is, by a width corresponding to the non-image area.
The photoreceptor 21 is exposed to light and static electricity is removed. Note that details of this extinguishing lamp 23 will be described later.

Next, an exposure lamp 28a, mirrors 28b, 28c,
28d.

Reflected light from an original (not shown) placed on a platen glass 29 is irradiated onto the photoreceptor 21 by an original scanning optical system 28 consisting of an imaging lens 28e, a mirror 28f, etc. An electrostatic latent image is formed thereon.

This electrostatic latent image is developed with toner in the developing device 24, but at this time, as mentioned above, since the non-image area has already been neutralized, toner does not adhere to the non-image area.
Wasteful consumption of toner is prevented.

The developed toner image is transferred by the transfer device 25 onto the paper conveyed from the paper feed cassette 30, and the transferred paper is peeled off from the photoreceptor 21 by the peeling device 26, and then transferred by the conveyance belt 31 toward the fixing device 32. After being fixed, the paper is ejected to a paper ejection tray 34 by an ejection roller 33.

In the above-described copying machine, when performing variable-magnification copying, that is, reduction or enlargement copying, it is necessary to change the size of the original image formed on the photoreceptor 21. The optical path in this case will be explained with reference to FIG. 2. In addition, in FIG. 2, the optical paths are shown expanded on the same plane.

Now, the focal length of the lens 28e is f1, the copying magnification is 01, the distance between the original surface A and the lens 28a is a1, the lens 28e
If the distance between b1 and the surface B of the photoreceptor 21 is conjugated length L, f a b n = b = f (10 n) L = a + b.

Now, assuming that the maximum original width is P and the maximum paper width is D, when copying at the same size, that is, when the copying magnification is 100% (n = 1), the distance alOn between the original surface A and the lens 28e, and the distance between the lens 28e and the The distance b 100 from the surface B of the photoreceptor 21 becomes equal, and D=P.

When performing reduction copying, the lens 28e is viewed along the optical axis and is moved toward the photoreceptor 21 from the position at the time of full-size copying, for example, at X+.
The image formed on the surface B of the photoreceptor 21 is reduced by moving the photoreceptor 21 by the same amount. The reduction ratio at this time is 1), /ah. At this time, when the side edge of the document is aligned with the reference position M, the position of one side edge of the latent image formed on the photoreceptor 21 must match the reference position N regardless of the size of the copy magnification. be. This is because each process in the image forming process and the handling of paper become easier if the side edge positions of the image are kept constant. For this reason, the lens 28e is not only moved in the optical axis direction, but also Y
l It is necessary to move it by a certain amount. The amount of movement of the lens 28e during this variable magnification copying, X1°Y, from the same magnification copying is f(n-1)X=f(1-n).

Furthermore, if the exposure width on the photoreceptor 21 during reduction copying is E (see Figure 3), then E = l''n.In other words, during reduction copying, the actual paper width E is subtracted from the maximum paper width. The area that does not contribute to image formation becomes a non-image area.In other words, the width F of the non-image area is F=D-E=D-P-n=(1-n)P. Note that D=P.

A basic configuration example for adjusting the amount of erasure will be described below with reference to FIGS. 4(a) and 4(b).

A lens support member 2 to which a lens 1 is attached is driven by a drive wire 3 and guided by a guide rod 4 to move linearly. A cam 5 is integrally provided on the lens support member 2 so as to be inclined with respect to the moving direction. The profile of this cam 5, that is, the curved shape is similar to that of the lens l described above.
The movement amount xl in the optical axis direction and the extinction width F are shaped as follows: f(n-1)-F=(1-n)P.

On the other hand, between the extinguishing lamp 6 and the photoreceptor 7, the photoreceptor 7
A light shielding member 8 is provided so as to be movable in the width direction. This light shielding member 8 is urged in a direction opposite to the guide rod 4 via a pulley 11 by a wire 10 that is tensioned by a spring 9. Further, a cam follower 12 is provided integrally with the light shielding member 8 . The cam follower 12 is guided by a long groove 13 extending perpendicularly to the guide rod 4 formed on a frame (not shown), and is movable in the width direction of the photoreceptor 7.

Now, the lens support member 2 is in the reduction copying direction, that is, in the fourth direction.
In the case shown in the figure, when moving to the right, the cam follower 12 is moved by the inclined portion 5a of the cam 5 integrated with the lens support member 2.
is pushed to the right. However, since the movement of the cam follower 12 is limited only in the width direction of the photoreceptor 7 by the long groove 13, the cam follower 12 moves in the direction of the guide rod 4 against the force of the spring 9. Therefore, the light shielding member 8 integrated with the cam follower 12 moves in the direction of the guide rod 4, and a portion of the extinguishing lamp 6 becomes exposed from the light shielding member 8.

Therefore, if the extinguishing lamp 6 is turned on over the entire width, the light reaches only a predetermined width of the photoreceptor 7, that is, the non-image area, and the charge is removed, making it possible to extinguish the desired width. Note that during minimum reduction copying, the cam follower 12
3 to the end on the guide rod 4 side, and the light shielding member 8 is completely retracted from in front of the extinguishing lamp 6. Therefore, all the light from the extinguishing lamp 6 is irradiated onto the photoreceptor 7, and the maximum width of extinguishing is performed.

Next, regarding other embodiments of the non-image exposure apparatus of the present invention,
This will be explained below with reference to FIGS. 5(a) and 5(b).

Note that the same reference numerals are given to the members corresponding to those of the embodiment shown in FIG. 4, and redundant explanation will be omitted.

In the embodiment shown in FIG. 5, the moving distance of the light shielding member is increased by indirectly driving the light shielding member using the action of a pulley instead of directly moving the light shielding member with a cam. .

A light shielding member 14 is provided between the extinguishing lamp 6 and the photoreceptor 7 so as to be movable in the width direction of the photoreceptor 7, similar to the embodiment shown in FIG. This light shielding member 14 is urged in the direction of the guide rod 4 by a spring 15. Furthermore, a bracket [7] which is biased in the opposite direction to the guide rod 4 by a spring 16 is disposed between the inclined portion 5a of the cam 5 and the light shielding member 14, and a pulley 18 pivotally connected to this bracket 17 is disposed. A shaft-shaped cam follower 19 is provided as an extension of the shaft.

This cam follower 19 has a long groove 1 formed in the frame.
3, it is movable in the width direction of the photoreceptor 7. Further, a wire 20 having one end 20a fixed to a fixed part such as a frame and the other end 20b fixed to the light shielding member 14 is wound around the pulley 18 for half a circumference.

Now, when the lens support member 2 moves in the reduction copying direction, that is, in the case of FIG. 5, rightward, the cam follower 19 is pushed rightward by the inclination n 5 a of the cam 5 integrated with the lens support member 2. However, since the movement of the cam follower 19 is limited only in the width direction of the photoreceptor 7 by the length 113, the cam follower 19 moves in the direction of the guide rod 4 against the force of the spring 16. At this time, pulley 1
The other end 20b of the wire 20 stretched across the wire 8 is fixed to the light shielding member 14, and the light shielding member 14 is connected to the guide rod 4.
Since the light shielding member 14 is biased in the direction by the spring 15, the pulley action of the boo IJ 18 and the wire 20 causes the light shielding member 14 to
moves in the direction of the guide rod 4 by a distance twice the distance traveled by the cam follower 19. Therefore, the extinguishing lamp 6
is exposed from the end side of the photoreceptor 7 by twice as much distance as in the embodiment shown in FIG.

Therefore, the light from the erasing lamp 6 reaches only a predetermined width of the photoreceptor 7, that is, the non-image area, and the electricity is removed, making it possible to erase the desired width.

When the light shielding member 14 is moved, it moves twice as far as the cam follower 19 due to the action of the pulley 18 and the wire 20, so the distance required for the cam follower 19 is half the distance required for the light shielding member 14. That would be enough. That is, if the amount of movement of the light shielding member 14 is the same as the amount of movement of the light shielding member 8 in the embodiment shown in FIG.
The width of the inclined portion 5a of the cam 5 in the radial direction of the photoreceptor 7 can be reduced, and the inclination can be made gentler. Therefore, the force that the cam 5 receives from the cam follower 19 becomes small, and it becomes possible to move the light shielding member 14 with a small force. As a result, it becomes possible to use a small and low-cost motor for moving the lens support member 2, and since the load is reduced, the movement of the lens support member 2 becomes smooth.

Next, regarding an example in which the non-image area exposure device shown in FIG. 5 is incorporated into an actual copying machine, the cross-sectional view of the image forming system of the copying machine shown in FIG. This will be explained with reference to a plan view of the apparatus, a plan view and a sectional view of the original scanning optical system in FIGS. 8(a) and 8(b), and the like.

In the image forming system of the copying machine shown in FIG. 6, a charger 42. Non-image area exposure device 43. Developing device 44, transfer B4
5. Peeler 46. Peeling claw 47. Cleaning devices 48 and the like are sequentially arranged. Further, the paper after the transfer is sent to a fixing device (not shown) by a conveyor belt 49.

The non-image area exposure device 43 is provided so as to be movable independently in the width direction of the photoreceptor 41 with respect to a non-image area exposure device main body 52 equipped with an extinguishing lamp 51 and the non-image area exposure device main body 52. The first and second moving members 53 and 54 are provided.

The non-image area exposure device main body 52 extends from the side end of the photoreceptor 41 in the width center direction, and the housing 55 has three long grooves extending in the width direction of the photoreceptor 41 on the photoreceptor 41 side. 56, 57, 58 are formed. In the long groove 56,
The above-described extinguishing lamp 51 for exposing the non-image area in the width direction of the photoreceptor 41 is accommodated in the long groove 58.
An extinguishing lamp 59 that exposes the non-image area in the circumferential direction of
is accommodated. The extinguishing lamp 51 is generally called a site toilet lamp, and for example, the photoreceptor 4
The effective width of 1 is 310 cm, and the exposure width at minimum reduction is 1
When the length is 90 mm, the tank bottom is formed by 12 yellow-green light emitting diodes arranged in the width direction of the photoreceptor 41 at a pitch of 10 mα. Further, the extinguishing lamp 59 is called an interimage lamp in -m, and is, for example, 10
It is composed of 32 yellow-green light emitting diodes arranged in the width direction of the photoreceptor 41 at a pitch of mm.

Further, a photoreceptor 41 is provided on the back and side surfaces of the housing 55.
Rails 60 and 61 are formed extending in the width direction.

In the first moving member 53, as shown in FIG. 7, the bracket 62 has four guide wheels 63a.

63b, 63c, and 63d are pivotally mounted. Guide wheel 63a.

63b is engaged with the rail 61 of the non-image area exposure device main body 52, and guide wheels 63c and 63d are engaged with the rail 60. Further, a shaft-shaped cam follower 64 is installed on the bracket 62, and its tip protrudes through a long groove 66 formed in an isolation frame 65 toward the document scanning optical system disposed above the image forming system. . Further, a pulley 67 is loosely fitted onto the shaft portion of the cam follower 64.

The second moving member 54 also includes a first moving member 5.
3, four guide wheels 68a, 68b, 68
C.

68d are pivotally mounted, guide wheels 68a and 68b engage with rail 61, and guide wheels 68c and 68d engage with rail 60. Further, a light shielding member 69 is provided continuously to the second moving member 54 and is disposed between the photoreceptor 41 and the extinguishing lamp 51. Furthermore, the tip portion 69a of the light shielding member 69 is bent, and the non-image area exposure device main body 52
It is slidably inserted into the long groove 57 of.

A wire 71 is stretched between the second moving member 54 and a fixed part 70 provided on the frame side via a pulley 67, and the second moving member 54 is connected to the seventh It is biased to the left in the figure. As a result, the cam follower 64 installed on the bracket 62
wire 71. A force directed to the left in FIG. 7 is applied via the pulley 67, causing it to come into contact with one end of the long groove 66.

FIGS. 8(a) and 8(b) show a plan view and a cross-sectional view of the document scanning optical system, and as shown in FIG. 8(a), they are inclined to the optical axis of the optical system and parallel to each other. Between a pair of guide frames 818.81b having a crank-shaped cross section,
A lens carriage 82 is slidably arranged. That is, as shown in FIG. 9, at the side end portion of the lens carriage 82, there are engaging pieces 82a located above and below the horizontal portion 81c of the guide frame 81a to regulate the vertical position.
82b, and a guide roller 82C that comes into contact with the side end portion of the horizontal portion 81c to regulate the horizontal position.

As shown in FIG. 8, the lens carriage 82 has a guide groove 82d formed at right angles to the document scanning direction. On the other hand, the lens support member 83 to which the lens 83a is attached
As shown in FIG. 10, an engaging leg 83b that slidably engages with the side edge 82e of the guide groove 82d is provided at the lower part of the lens carriage 82. The lens 83a is slidably guided.

Furthermore, a guide bin 83c is installed at the lower end of the lens support member 83 so as to face downward as shown in FIG. This guide pin 83C is engaged with a curved guide rail 84 that is attached to the isolation frame 65 and has a substantially U-shaped cross section.

The lens carriage 82 is driven by the drive wire 85 and moves linearly while being guided by the guide frames 81a and 81b. A cam 86 is integrally attached to the lens carriage 82.
The above-mentioned cam follower 64 (sixth
(see figure) is driven. In addition, the lens support member 83 also
It moves in conjunction with the movement of the lens carriage 82 while its position in the direction perpendicular to the document scanning direction is regulated by the curved guide rail 84 .

The reflected light from the original (not shown) passes through mirrors 91a to 91C, lenses 83a and mirror 91d, and further through a through hole 92 formed in isolation frame 65, as shown in FIGS. The photoreceptor 41 is irradiated with light.

Next, the 6th v! The operation in the embodiment shown in FIGS. J to 8 will be described in detail.

In this embodiment as well, the lens carriage 82 moves along the guide frames 81a and 81b in response to changes in copying magnification, as in the previously described embodiments. For reduced copying,
The lens carriage 82 moves in the direction approaching the photoreceptor 41, that is, in the right direction at the 8th rgJ, and
It moves in the direction of the copy reference position, that is, upward in the figure. At this time, by correcting the position of the lens support member 83 using the curve of the curved guide rail 84, an accurate lens position according to the copying magnification is defined.

Furthermore, as the lens carriage 82 moves, the cam follower 64 provided integrally with the first moving member 53 causes the cam 86 provided integrally with the lens support member 83 to tilt! 1fls86a, and is guided by the long groove 66 against the force of the spring 71, and moves toward the guide frame 81 in a direction perpendicular to the optical axis. At this time, one end 71a of the wire 71 stretched around the pulley 67 is locked to a fixing part 70 provided on the frame side, and the other end 71b is connected to a second movable part with a light shielding member 69 integrally formed. The second movable member 54 is fixed to the member 54, and is biased to the left in FIG. 7 by a spring 72, so that when the pulley 67 moves, the pulley 67 and the wire 7
Due to the pulley action of the cam follower 6, the light shielding member 69
The photoreceptor 41 is moved toward the width center of the photoreceptor 41 by a distance twice as much as the moving distance in step 4.

At this time, since all the light emitting diodes of the extinguishing lamp 51 as a site toilet lamp are basically turned on, the movement of the light shielding member 69 causes the extinguishing lamp 51 to be turned on.
A part of the light is irradiated onto the photoreceptor 41 without being blocked by the light shielding member 69. That is, the exposure width in the width direction of the photoreceptor 41 is increased. Therefore, it is possible to eliminate electric charge in the non-image area in the width direction that occurs when performing reduction copying, and it is possible to prevent wasteful consumption of toner during development.

Note that all of the 12 light emitting diodes provided in the extinguishing lamp 51 are not turned on and off at the same time, but are divided into two or three regions and controlled independently within a range that does not cause an excessive increase in cost. You can.

Also, at this time, the extinguishing lamp 59 as an interimage lamp is lit intermittently over the entire width of the photoconductor 41 in synchronization with the rotation of the photoconductor 410, and
Charges in non-image areas between adjacent image areas formed on the photoreceptor 41 in the circumferential direction are removed.

〔Effect of the invention〕

As described above, according to the present invention, a cam member having a predetermined curved shape is integrally provided on a member that movably supports the lens, and by directly pushing the cam follower with this cam member, the light of the lens is The movement in the axial direction is converted into movement in the width direction of the photoreceptor, and the light shielding member is moved based on the movement of the cam follower. Therefore, the light shielding member can be moved by a predetermined amount in the width direction of the photoreceptor with an extremely simple structure.

Furthermore, by transmitting the movement of the cam follower to the light shielding member via the pulley and wire, the amount of movement of the light shielding member becomes twice the amount of movement of the cam follower. That is,
The amount of movement of the cam follower required to obtain the same amount of movement of the light shielding member is halved. Therefore, since the slope of the curved shape of the cam member can be made gentle, the force that the cam member receives from the cam follower becomes small, and it becomes possible to move the light shielding member with a small force. As a result, it becomes possible to use a small and low-cost motor for moving the member supporting the lens, and the load is lightened, so that the movement of the lens support member becomes smooth.

[Brief explanation of drawings]

FIG. 1 is a schematic sectional view of a copying machine to which the non-image aS optical device of the present invention is applied, FIG. 2 is a diagram for explaining the optical system during variable magnification copying in the same copying machine, and FIG. 3 is a diagram showing the same copying machine. FIGS. 4(a) and 4(b) are diagrams for explaining the width of the non-image area on the photoreceptor during variable-magnification copying in a machine, and show the basic configuration of the non-image area exposure device of the present invention. 5(a) and 5(b) are a plan view and a perspective view of another embodiment of the non-image area exposure apparatus of the present invention, and FIG. 6 is a non-image 1f of the present invention.
FIG. 7 is a cross-sectional view of the image discipline system of a copying machine to which the fl exposure device is applied; FIG. 7 is a plan view of the non-image area exposure device; FIG. 8 (a)
, (b) is a plan view and a cross-sectional view of the original scanning optical system, No. 9
The figure is a schematic diagram explaining the sliding structure of the lens carriage, FIG. 10 is a schematic diagram explaining the sliding structure of the lens support member,
FIG. 11 is a schematic diagram illustrating the movement locus regulating structure of the lens support member. 1.2Be: Lens 3.85 + Drive wire 5.86: Cam 6: Extinguishing lamp 8.14, 69: Light shielding member 10.20, 71: Wire 12, 19.64: Cam follower, 66: Long groove 2Qa, 71a Ni One end 22.42: Charger 24.44: Developing device 26.46: Peeling device 28a: ! i-light lamps 28a to 28d, 28f, 91a to 91d
: Mirror -28: Scanning optical system 29 Nibraten glass 30; Paper feed cassette 31, 49: Conveyor belt 2.83: Lens support member 4: Guide rods 5a, 86a: Inclined portion? , 21.41 + Photoconductor 9, 15.16.72 Nispring u, tg, 67: Pulley lower 17.62 Nibble bracket 20b, 71b: Other end 23, 51.59: Eraser lamp 25.45 + Transfer device 27.48 : Cleaning device 32: Fixing device 34: Paper ejection tray 47: Peeling claw 53: First moving member 55: Housing 60.61: Rail [i3a to 63d, 68a to 68d65: Isolation frame 70: Fixed part 81C: Horizontal part gQa, 1121]: Engagement piece 82d: Guide groove 3.3b: Engagement leg 92: Through hole 33: Discharge roller 43: Non-image area exposure device 52: Non-image area exposure device main body 54: Second moving member 56, 57.58: Long groove two guide wheels 69a: Tip parts 81a, 81b: Guide frame 82: Lens carriage 82c: Guide roller 83a: Lens 83C two guide bins

Claims (1)

[Scope of Claims] 1. In a copying machine that performs variable magnification copying by moving the position of an image forming lens, an extinguishing lamp is provided facing a photoreceptor and extending in the width direction of the photoreceptor, A light shielding member movable in the width direction of the photoreceptor is provided between the extinguishing lamp and the photoreceptor, a cam follower is provided on the light shielding member, and a member movably supporting the lens has a curved shape. 1. A non-image area exposure device for a copying machine, comprising: a cam member that abuts the cam follower. 2. In a copying machine that performs variable magnification copying by moving the position of an image forming lens, an extinguishing lamp facing the photoreceptor and extending in the width direction of the photoreceptor is provided, and the extinguishing lamp and the A light shielding member movable in the width direction of the photoconductor is provided between the photoconductor, a wire is stretched between the light shielding member and a fixed part on the copying machine main body side via a pulley, and the wire is integrated with the pulley. 1. A non-image area exposure device for a copying machine, characterized in that a cam follower that moves symmetrically is provided, and a cam member that movably supports the lens has a curved surface and comes into contact with the cam follower. 3. The curved shape of the cam member has a function that converts the position of the lens according to magnification change into the width of a non-image area on the photoreceptor. A non-image area exposure device of the copying machine described above.