JPS63212966A - Optical device for exposure of copying machine - Google Patents

Abstract

PURPOSE:To copy an image of an original on an arbitrary position by moving the end part of an optical fiber provided on a convergent optical transmission body in the revolving axial direction of a photosensitive body, and also projecting a light beam on an electrostatically charged part being the outside of an electrostatic latent image forming area. CONSTITUTION:A light source 23 is provided on a frame 17 of an original placing table 1 side, and an optical fiber 24 which has bundled many fibrous bodies in a band shape and is abundant in flexibility is attached so that its end part is allowed to correspond to both convergent optical transmission bodies 21, 22, respectively, and also, brought to reciprocating motion freely in the revolving axial direction of a photosensitive body 4. Also, projecting means 37, 38 for projecting a light beam to an electrostatically charged part are provided on the end part of the optical fiber 24, respectively. In such a way, an image of an original can be copied on an arbitrary position of copying paper by projecting a light beam on the charged part being the outside of an electrostatic latent image forming area.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an exposure optical device for a copying machine.

[Conventional technology]

As an exposure optical device of a copying machine, converging light transmitting bodies are disposed in correspondence with predetermined positions near the bottom surface of the document table and near the surface of the photoreceptor, respectively, and an optical fiber is provided across both of the converging light transmitting bodies. (for example, JP-A-5
4-150133).

The above-mentioned exposure optical device moves a first scanning body including a light source and a first mirror, and a second scanning body including second and third mirrors at a speed ratio of 2:1 in the paper feeding direction. Compared to an exposure optical device consisting of a mirror set that is configured to rotate, the present invention has advantages such as not requiring difficult speed adjustment, and being structurally extremely simple and inexpensive.

[Problem that the invention seeks to solve]

By the way, for example, when copying and filing an image of a manuscript, it is necessary to form a binding margin at one end of the copy paper, or when copying the main part of the image of the manuscript, copying the main part from the copy paper. In order to enable copying to be carried out in the center of the document, the paper feeding timing has traditionally been configured to be changeable so that a copying mode can be adopted in which the image area of the document can be moved in the paper feeding direction. .

However, in the above optical fiber type exposure optical device, the moving direction of the image area is limited to the paper feeding direction, and the image area cannot be moved in the direction of the rotation axis of the photoreceptor.

Of course, for example, JP-A-57-90664 and JP-A-5
Copying machines such as those seen in Publication No. 9-152433 have completely different exposure modes from optical fiber type ones, and although the image area can be moved in the direction of the rotational axis of the photoreceptor by moving the lens, these also have drawbacks. In both cases, the periphery of the copied image becomes thinner and blurred as the lens moves, and the latter type in particular is computer-controlled, which has the disadvantage that the overall structure is complicated and expensive.

[Means for solving problems]

The present invention has been devised in view of the above-mentioned circumstances, and is compatible with the optical fiber type exposure optical device described at the beginning, that is, at predetermined positions near the bottom surface of the document table and near the surface of the photoreceptor, respectively. and arranging a converging light transmitting body, and providing an optical fiber across both of the converging light transmitting bodies, and configuring at least one end of the optical fiber to be movable back and forth in the direction of the rotation axis of the photoreceptor, The present invention is characterized in that a light projecting means is provided for projecting light onto a charged portion of the photoreceptor surface which is outside the electrostatic latent image forming area as the end of the optical fiber moves.

[Effect]

According to the above characteristic configuration, by moving the end of the at least one optical fiber, the image of the document is moved in the direction of the rotation axis of the photoreceptor, and the image is formed as an electrostatic latent image on the surface of the photoreceptor. Ru.

In this way, when the image area is moved relative to the photoreceptor surface, since the portion of the photoreceptor surface that is outside the electrostatic latent image forming area is charged, the entire surface of the copy paper in the portion corresponding to the charged portion is is developed, which is not only unsightly but also consumes a huge amount of toner, making it extremely uneconomical.

However, by projecting light onto a charged portion that is outside the electrostatic latent image formation area, development is no longer performed in the charged portion.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a schematic cross section of the entire copying machine, and shows that a photoreceptor 4 is horizontally mounted on a copying machine main body 3 equipped with a document presser 2 for a document table l. , a charging device 5, a developing device 6, and a transfer device F? are arranged around the photoreceptor 4. , a copy paper separation device 8, and a cleaning device 9, an exposure optical device 10 is provided in the upper space of the copying machine main body 3, and the copy paper a from the cassette case 1) is transferred to the transfer device. a paper feed conveyance device 12 that feeds paper toward the tray 15; a paper discharge conveyance device 14 that conveys the copy paper a after transfer and separation to the fixing device 13; and a paper discharge device that feeds the copy paper a after fixing to the tray 15. A roller pair 16 is provided.

The exposure optical device 10 is constructed as follows.

That is, as shown in FIGS. 2 and 3, a frame 17 is provided on the lower surface side of the document table 1 and is movable back and forth over a range capable of scanning the largest size document. A U-shaped frame 18, which can freely rotate back and forth around the axis, is pivotally attached to a support shaft 20, 20 that is concentric with the rotating shaft 19 of the photoconductor 4, and the frame 18 is pivoted to a support shaft 20, 20 that is concentric with the rotation shaft 19 of the photoreceptor 4, and is configured to hit the maximum size original sheet. (width in the rotational axis direction of the photoreceptor 4), convergent light transmitters 21 and 22 having a length approximately equal to
7 and -18 respectively, and one document table 1.
The side frame 17 is equipped with a light source 23, and a highly flexible optical fiber 24, which is a band-like bundle of multiple fibers, is connected to the refocusing optical transmission body 21.
22 and said frames 17 and 18.
It is attached to each of the photoreceptors 4 so as to be able to reciprocate in the direction of the rotational axis of the photoreceptor 4.

Specifically, long holes c, c are formed in the frame 17 on the document table side in the direction of the rotational axis of the photoreceptor 4, and the long holes c
, c is attached to the end holding member 26 of the optical fiber 24, and an L-shaped moving operation member 27 is connected to one end side of the end holding member 26. At the same time, a moving operation tool 28 that can freely move back and forth in the direction of the rotational axis of the photoreceptor 4 is provided on the upper surface side of the copying machine main body 3;
This moving operating tool 28 is formed with an engaging portion e into which the operating plate portion d of the moving operating member 27 engages when the frame 17 is at the home position.

The interlocking member 29 has a rank f1 formed on the lower surface side.
is connected to the moving operation tool 28, and an arm 30 whose one end side faces the retaining part e and whose other end side can be freely engaged and detached from the fixing rank member f is pivotally connected to the upper surface side of the interlocking member 29. , and a spring 31 is provided that biases the other end of the arm 30 in a direction to engage the rack component, so that the one end of the arm 30 is pressed when the frame 17 is at the home position. Then, the other end of the arm is released from the rack member f, and in this state, by moving the moving operating tool 28 in the direction of the rotation axis of the photoreceptor 4, the end of the optical fiber 24 on the document table side is moved. is photoreceptor 4
It is designed to be moved in the direction of the axis of rotation.

On the other hand, the U-shaped frame 18 on the photoreceptor side is also formed with elongated holes g, g in the direction of the rotational axis of the photoreceptor 4, and the headed pin body 42 inserted into the elongated holes g, g is connected to the optical fiber. The rack f! is attached to the end holding member 32 of 24, and the rack f! An L-shaped interlocking member 33 having a
The pinion PT that meshes with the U-shaped frame 18
It is rotatably held by a bracket 34 connected thereto.

The interlocking member 2 connected to the moving operation tool 28
The pinion p that meshes with the rack f1 of 9 is connected to the copying machine main body 3.
The pinion p1 and the pinion p2 on the photoreceptor side are rotatably held by a bracket 35 connected to the
The end of the optical fiber 24 on the photoreceptor side is connected to the inner wire h of the Bowden wire 36 in conjunction with the movement operation of the moving operation tool 28, and the end of the optical fiber 24 on the document table side is connected to the inner wire h of the Bowden wire 36. It is designed to be moved in the opposite direction.

That is, both ends of the optical fiber 24 are configured to be moved in opposite directions in the direction of the rotational axis of the photoreceptor 4, and as shown in FIG. 24 in the direction of arrow P (to the left in the figure), and the end of the optical fiber 24 on the photoreceptor side to the direction of arrow Q (to the right in the figure), by one dimension each. The image of the document is formed as an electrostatic latent image on the surface of the photoreceptor while being displaced in the direction of the arrow Q by the total amount of movement zx2.

In other words, it is possible to adopt a copy mode in which the image area of the document sheet is moved in the direction of the rotation axis of the photoreceptor 4.

At this time, the area where the electrostatic latent image is formed on the surface of the photoreceptor is
Width and total movement of manuscript table 1! ! ×2 difference (L −j!
x 2), and this electrostatic latent image forming area (L-
The surface of the photoreceptor in the area outside of IX2) (corresponding to a 2 x 2 area) remains charged, and if this continues, there is a problem that the entire surface of copy paper a corresponding to the charged area will be developed. .

In order to solve this problem, each end of the optical fiber 24 is provided with a light projecting means 37, 38 for projecting light onto the charged portion.

The light projecting means 37 on one document table side is constructed as follows. That is, as shown in FIGS. 2 and 3, the length of the light source 23 is made longer than the width dimension of the optical fiber 24, and both ends of the light source 23 are placed outside the widthwise ends of the optical fiber 24. Mirrors 39 and 39 are provided in the frame 17 so as to protrude in the opposite direction, and mirrors 39 and 39 are provided in correspondence with the protruding portion of the light source 23, which improves convergence when the end of the optical fiber on the document table side is moved. The exposure light source 23 is attached to a portion of the fiber protruding from the end of the optical transmission body 21.
By reflecting light from the optical fiber, a charged portion on the surface of the photoreceptor corresponding to the optical fiber portion is optically neutralized.

As shown in FIGS. 2 to 4, the light projecting means 38 on the other photoconductor side has light sources 40 and 40 connected to both sides of the optical fiber holding member 32 on the photoconductor side, and also connects the holding member 3
A switch mechanism 41 that lights up the light source 40 on the upper side in the moving direction in conjunction with the movement of the end of the optical fiber via 2,
One movable terminal i of the switch mechanism 41 is held by the holding member 32.
and the other fixed terminal j is provided on the frame 18 side, and the charged portion of the surface of the photoreceptor on the upper side in the moving direction of the optical fiber end portion on the photoreceptor side is directly illuminated by the light from the light source 40. It is configured to eliminate static electricity.

Further, an arm 43 is attached to the frame 18 on the photoreceptor side.
A member 44 formed with a circular arc rank f around the rotational axis of the photoreceptor 4 is attached to the arm 43, and a pinion p meshes with the circular arc rank f.
, is rotatably provided on a bracket 45 connected to the copying machine main body 3, while a moving operating tool 46 is movable back and forth in the paper feeding direction.
is provided on the top side of the copying machine main body 3, and a rack f4 is connected to the moving operation tool 46, and the rack f4
A pinion ρ meshing with the arc rack f is rotatably provided on a bracket 47 connected to the copying machine main body 3, and the pinion p4 and the pinion p meshing with the arc rack f are connected by an inner wire m of the Bowden wire 48. The end of the optical fiber 24 on the photoreceptor side is connected to the convergent light transmitting member 22 in conjunction with the moving operation of the moving operation tool 46.
At the same time, the photoreceptor 4 is reciprocated in the rotational direction.

Then, when the end of the optical fiber 24 on the photoconductor side is moved to the upper side (or lower side) in the rotational direction of the photoconductor 4,
The image of the original is formed as an electrostatic latent image on the surface of the photoconductor while the photoconductor 4 is shifted upward (or downward) in the rotation direction of the photoconductor 4 by the amount of movement. , move the image area of the document to the upper side (or lower side) in the paper feeding direction.
It is now possible to take the form of a copy that can be moved to another location.

In summary, in the exposure optical device 10 configured as described above, the image area of the document sheet can be moved in the direction of the rotation axis of the photoreceptor 4 and the rotation of the photoreceptor 4 by a simple operation of moving the moving operation tool 28.46. In addition, when the image area is moved in the direction of the rotation axis of the photoreceptor 4, the charged portion of the photoreceptor surface on the lower side in the direction of movement is optically neutralized. , it is possible to form a predetermined margin on the copy paper surface corresponding to the core part.

In the embodiment, a configuration in which both ends of the optical fiber 24 are moved in conjunction with each other in opposite directions has been described, but a configuration in which both ends of the optical fiber 24 are moved separately or only one end is moved is described. Furthermore, the convergent optical transmission body 21 or 22 may be moved together with the optical fiber 24 whose end portion is moved.

Furthermore, in the above embodiment, the so-called optical system moving type exposure type was shown in which the document table side of the optical fiber 24 is moved along the document table 1, but the exposure mode is such that the optical system is fixed and the document table l is moved. The present invention may also be implemented in an exposure mode using a so-called moving document table.

〔Effect of the invention〕

As explained above, the present invention has an extremely simple structure in which, in the optical fiber type exposure optical apparatus described at the beginning, at least one end of the optical fiber is configured to be movable back and forth in the direction of the rotation axis of the photoreceptor. As a result of these improvements, it has become possible to adopt a copy mode in which the original image is moved in the direction of the rotational axis of the photoreceptor. By configuring the end of the optical fiber on the surface of the photoreceptor to be able to move back and forth in the direction of rotation of the photoreceptor, it became possible to copy the original image to any position on the copy paper. .

Furthermore, if the optical fiber is simply moved to move the original image in the direction of the rotation axis of the photoreceptor, charges will remain on the surface of the photoreceptor outside the area where the electrostatic latent image is formed. There is an inconvenience that the entire surface of the copy paper in the corresponding area is developed, but by emitting light to eliminate charges on the charged area outside the electrostatic latent image forming area, the inconvenience of developing in the charged area can be avoided, and the entire surface of the copy paper is developed. As a result, we have developed a structural solution to move the image in the direction of the rotation axis of the photoreceptor, which could not be achieved with the exposure optical device of the optical fiber set, and to eliminate the inconvenient development appearance that occurs with such image movement. This has been achieved easily and inexpensively.

[Brief explanation of the drawing]

Fig. 1 is a schematic sectional view of the entire copying machine, Fig. 2 is a perspective view of the main parts, Fig. 3 is a side view of the exposure optical device, Fig. 4 is an explanatory view of the light projecting means on the photoreceptor side, Fig. 5 The figure is an explanatory diagram of image area movement. l... Document table, 4... Photoreceptor, 21.22... Focusing light transmission body, 23... Light source, 24... Optical fiber, 37.38... Light projecting means, 39. ...mirror, 4
0...Light source, 41...Switch mechanism. Applicant: Sanda Kogyo Co., Ltd. Representative: Hideo Fujimoto, Patent Attorney Figure 1 1... Document stand 4... Photoreceptor 23... Light source 24... Optical fiber Figure 3 Figure 5

Claims (3)

[Claims] (1) Convergent light transmitters are disposed in correspondence with predetermined positions near the bottom surface of the document table and near the surface of the photoconductor, and an optical fiber is provided across both of the convergent light transmitters, and the optical fiber is At least one end portion is configured to be movable back and forth in the direction of the rotation axis of the photoreceptor, and
1. An exposure optical device for a copying machine, comprising a light projecting means for projecting light onto a charged portion of the photoreceptor surface which is outside the electrostatic latent image forming area as the end of the optical fiber moves. (2) For exposure use in a copying machine according to claim (1), wherein the light projection means comprises a mirror that projects light from an exposure light source onto the charged portion through an optical fiber end on the document table side. optical equipment. (3) The light projecting means comprises a light source that projects light onto the charged portion, and a switch mechanism that turns on the light source in conjunction with movement of the optical fiber end on the surface side of the photoreceptor. ) An exposure optical device for a copying machine according to item 1.