JPS63115180A - Copying machine - Google Patents

Abstract

PURPOSE:To prevent an image from being missed owing to a separation belt by moving a reduced image of an original to the opposite side of a photosensitive drum from the separation drum in a device which forms a binding margin at one end of a transfer material. CONSTITUTION:The position and width of a blank are inputted with blank specification keys on a keyboard and a print switch is pressed, so that a control circuit determines copy magnification and the positions of light shield plates 17a and 17b, a shutter 16, and a projection lens 6 corresponding to the key inputs. Then a lens 6 is set to the copy magnification alpha(A-B)/A, where alphais the magnification determined by the sizes of the original image and transfer material, A is the width of the transfer material, and B is the binding margin. Further, the lens 6 shifts in position by a distance AB/2(2A-B) to the opposite side of the photosensitive drum 15 from the separation belt 18. The light shield plates 17a and 17b also move accordingly and the binding margin is formed without being affected by the separation belt.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a copying apparatus capable of forming a binding margin on a transfer material.

(Prior Art) Conventionally, as this type of apparatus, there are the following types. In other words, in order to form a binding margin at one end of the transfer material,
There is a method in which the position of the copy image is shifted on the transfer material to form a margin as a binding margin at one end of the transfer material. However, in this case, if the original to be copied has an image completely from edge to edge, if the position of the copied image is shifted on the transfer material in order to form a binding margin on the transfer material, a portion of the transferred image may be There is a problem in that the image protrudes from the transfer material and the image at the edge of the document is missing.

Therefore, in order to solve the above-mentioned problems, a method has been proposed in which the original image is reduced and copied onto a transfer material, and a binding margin is formed at one end of the transfer material (Japanese Patent Application Laid-Open No. 1983-1999-1). 2
03426).

(Problems to be Solved by the Invention) However, this prior art has the following problems. That is, a separation belt for separating the transfer material onto which an image has been transferred from the photosensitive drum is disposed at a portion of the photosensitive drum corresponding to one end of the transfer material. Therefore, when the copy image is moved to the side of the photosensitive drum where the separation belt is provided, there is a problem in that part of the copy image is chipped by the separation belt.

Therefore, the present invention has been made to solve the above-mentioned problems of the prior art, and its purpose is to provide a device capable of forming a binding margin at one end of a transfer material, even when a separation belt is used. It is an object of the present invention to provide a copying device capable of preventing image loss.

(Means for Solving the Problems) In order to achieve the above object, the present invention reduces the image of a document and exposes it to light on an image carrier to form a latent image, and the W! i
After the image is developed and transferred onto the transfer material.

In a copying apparatus capable of separating the transfer material from the image carrier by a separation belt provided at one end of the image carrier and forming a binding margin on the transfer material, the reduced image of the document is transferred to the separation belt of the image carrier. and is configured to be moved to the opposite side.

(Function) In the present invention, by moving the small image to the side opposite to the separation belt, it is possible to prevent the image from being chipped.

(Example) The present invention will be explained below based on illustrated embodiments.

FIG. 2 shows a schematic configuration of a reader printer as an embodiment of the copying apparatus according to the present invention.

The microfilm F as an 1X draft is illuminated by an illumination means consisting of a lamp face mirror 4 and a condenser lens 5, and the illuminated image is captured by a league part optical system consisting of a projection lens 6 having a zoom prism function and mirrors 7 to 1O. The image is projected onto the screen 11 at a predetermined magnification by the lens 6. In this case, the scan mirrors 12 and 13 for the printer are retracted in the direction of arrow W to a position where they do not block the projection optical path a to the screen.

When copying the image on the microfilm F, the mirror 12 is inserted on the optical path between the mirror 8 and the mirror 9 as shown in the figure, and the mirror 12 and the mirror 13 are integrated and the arrow W is placed at the station of the circumferential speed of the photosensitive drum 15. The image light of the microfilm on mirror 8 is scanned in the direction of mirror 1.
2-13, passes through the slit 14, and is projected onto the exposure position of the photosensitive drum 15.

Reference numeral 16 blocks the exposure light with a movable shutter, and by setting the W light timing, the width of the image formed on the photosensitive drum 15k corresponding to the left and right directions on the screen 11 can be determined.

On the other hand, a pair of light shielding plates 17a and 17 are provided immediately in front of the slit 14.
b is disposed so as to be movable along a rail (not shown) in a direction perpendicular to the projection optical path and in the direction of the rotational axis of the photosensitive drum 15. The light shielding plates 17a-17b are each sandwiched between separate rollers (not shown) and pinch rollers (not shown),
A motor (not shown) independently advances and retreats into the optical path.

The light-shielding plates 17a-17b are used to provide a margin at the edge of the paper, and when the width B of the binding margin 3 in FIG. 1 is input using the keyboard as described later, the light-shielding plates 17a-17b shield the original image on the photosensitive drum 15 from light to the width B. position.

Intrude into the optical path.

A charging device, a developing device, a transfer device, and a cleaning device are arranged around the photosensitive drum 15, and copies can be obtained by a known process. That is, after the photosensitive drum 15 is uniformly charged by a charging device, a negative image, for example, on the microfilm F is exposed to form a static latent image. After this electrostatic latent image is developed by a developing device that performs reflective development, the developed image formed on the photosensitive drum is transferred onto a transfer material by a transfer device. At that time, as shown in FIG. 2, one end of the photosensitive drum 15 is
separation bell for separating the transfer material from the photosensitive drum 15)
18 are provided. The transfer material separated from the photosensitive drum is fixed by a fixing device and then discharged.

FIG. 3 shows details of the projection lens 6, in which an imaging lens 21 is held in a holder 22.
A prism holder 24 that holds a trapezoidal prism 23 for image rotation is rotatably installed in the prism holder 24 . The prism holder 24 can be manually rotated, and when it is rotated, the prism 23 rotates around the optical axis e, and the projected image is rotated by an angle twice the rotation angle of the prism. . Therefore, when the prism 23 is rotated by 45 degrees around the optical axis e, the projected image is projected with its direction changed by 90 degrees. can be projected onto. Further, this prism holder 24 is rotated by a motor 25. A gear 26 coupled to the motor 25 is installed on the circumferential surface of the prism holder 24.
The prism holder 24 is engaged with a 1-meter wheel 27, and when the motor 25 is driven, the prism holder 24 rotates together with the prism 23.

The projection lens 6 is a zoom lens. Holder 53
is screwed together with the holder 22, and moves in the direction of the optical axis e as the holder 53 rotates. Also holder 53
are the protrusion 53a of the holder 53 and the protrusion 52 on the wheel 52.
a and can be set only in a predetermined position, and after being set, it is rotated by the pulse motor 51. A gear 52 connected to the pulse motor 51 meshes with a gear 54 provided on the circumferential surface of the holder 53, and when the motor 25 is driven, the holder 53 rotates and moves in the direction of the optical axis e. By moving the holder 53, the lune group 21 and :t
The magnification is changed by changing the group pressure 0 of the S2 lens group 50.

:jS4 figure shows the movement mechanism of the projection lens0
In the figure, a movable base 34 fixedly supports the projection lens 6 on a guide rail 32 provided in the axial direction of the photosensitive drum 15 on one side of the upper surface of the base 31 and a curved edge 33 provided on the other side in the same direction. is supported by the fl movable residue.

A rack 35 is attached to the side edge of this moving table 34 in parallel with the rail 32.
is fixed, and the roller 37 attached to this rack 35 by a shaft 36 can be slid onto the upper surface of the curved edge 33 of the base 31! It's 21 years old.

Further, a servo motor 38 is attached to the upper surface of the base 31, and a gear 40 fixed to a drive shaft 39 of the servo motor 38 is engaged with a rack 35 of the movable table 34. Then, by driving the motor 38, the movable table 34 is guided by the guide rail 32 and the curved edge 33 of the table, and moves in the axial direction of the photosensitive drum 15 on the base 31. Depending on the displacement of this lens 6, the optical path length between the document and the lens, and the
Although the optical path length between the photosensitive drums does not change, the position of the original image formed on the drums is displaced in the axial direction of the photosensitive drums.

FIG. 5 is a block diagram showing the control system.
61 is a keyboard provided on the scanning panel; 62 is a control circuit that determines the copying magnification and the position to which the light-shielding plate, shutter, and projection lens are moved based on the margin position and width B input from the keyboard 61; and 63 is a control circuit 62 64 is a light shielding plate drive circuit that drives the light shielding plate to the position determined by the control circuit 62. 65 is a pulse motor drive circuit that drives the pulse motor 51 to the magnification determined by the control circuit 62. A servo motor drive circuit 66 drives the servo motor 38 so that the projection lens 6 is located at the position determined by the rotary control circuit.

In the above configuration, in the copying apparatus according to this embodiment, a margin is formed on the transfer material in the following manner. That is, if the user wants to obtain a print of the image projected on the screen 11 with binding 3 on the left side in the conveyance direction of the transfer material 1, as shown in FIG. Input the margin position and width B using keys (not shown).Next, press the print switch (not shown) on the keyboard 61, and the margin width B and position entered earlier will be sent to the control circuit 62. The control circuit 62 determines the copying magnification and the positions of the light shielding plate, shutter, and projection lens.

By the way, in this embodiment, the image is reduced and transferred to the photosensitive drum 15.
When exposing the image on the photosensitive drum 15, the image is moved to the side opposite to the separation bell (18) of the photosensitive drum 15. Therefore, the control circuit 62 calculates the magnification necessary to form the binding margin by calculating αX (A-B)/A for the magnification α determined by the size of the original image and the transfer material. Based on this result, the pulse motor drive circuit 65 is operated to rotate the Tehalus motor 51, and the magnification of the zoom lens 6 is changed to the set magnification. Furthermore, the zoom lens 6
By the moving mechanism shown in FIG. 3, AB
/2 Move by a distance of (2A-B). By doing this, the copied image is moved on the photosensitive drum in the direction opposite to the separation belt, that is, the direction opposite to the direction in which the binding margin is provided, as shown in FIG. In addition, the light shielding plate 17
b has been moved to a position where it blocks light from the portion of the binding margin B, and the light shielding plate 17a has been moved to a position where the opening width of the pickpocket 7) 14 is A-B.

At this time, the shutter 23 is in a closed state.

When the scanning mirror 13 moves in the R direction and reaches the initial exposure position, the scanning mirror 13 begins to reversely move in the W direction.
The shutter drive circuit 66 operates at a predetermined timing, the shutter 23 opens, and the scanning mirror 1
3 reaches the end point of scanning, the shutter drive circuit 66
is turned off and the re-shutter 23 is closed. At the same time, light shielding plate 1
7a and 17b are also returned to the predetermined initial position t+=t, and the pulse motor rotates to return the magnification to the initial set value, thus completing printing. The images sequentially exposed on the photosensitive drum are developed by electrophotography and then transferred to a transfer material 1, resulting in a print with margins as shown in FIG. 1.

In this way, in this embodiment, when copying an image while forming a binding margin on the transfer material, the image is reduced in size and moved in the opposite direction to the separation belt, so that the image is not chipped by the separation belt. A binding margin can be formed.

FIG. 7 shows another embodiment of the present invention, and the same parts as in the previous embodiment are denoted by the same reference numerals.
This embodiment shows a case where the projection lens 6 is not a zoom lens but a fixed focus lens. That is, in the case of a fixed focus lens, when changing the magnification, it is necessary to change the distance between the document and the lens and the distance between the lens and the drum.

Therefore, the position of the mirror 7 can be moved along guide rails 71 and 72 by a pulley 74 and a wire 75 driven by a motor 73. Since the other configurations and operations are the same as those of the previous embodiment, their explanations will be omitted.

In the above embodiment, a case was explained in which a macro film having a negative image was used as the original, but the invention is not limited to this, and may also be used when copying an image of a normal paper original. Of course, it can be applied. Also,
In this case, the non-image area may be exposed using a charge erasing lamp, LED, or the like instead of the light shielding plate or shutter.

Furthermore, in the above embodiment, the case where the binding margin is formed on the left side in the conveyance direction of the transfer material has been described, but by appropriately rotating the prism in the projection lens, the binding margin can be provided on the right side of the transfer material or in the front and rear direction. Of course, it is possible to do so.

(Effects of the Invention) The present invention has the above-described configuration and operation, and can prevent images from being chipped even when a one-separation belt is used in an apparatus capable of forming a binding margin at one end of a transfer material.

[Brief explanation of the drawing]

Figure 1 is an explanatory diagram showing the process of copying an image on a transfer material;
FIG. 1 is a schematic configuration diagram showing a reader printer as an embodiment of a copying apparatus according to the present invention. 3 is a longitudinal sectional view showing the projection lens, FIG. 4 is a perspective view showing the moving mechanism of the projection lens, FIG. 5 is a block diagram showing the control system, FIG. 6 is an explanatory diagram showing the projection optical system, and FIG. FIG. 7 is a schematic perspective view showing another embodiment of the present invention. Explanation of symbols 1...Transfer material 3...Binding margin 15...
Photosensitive drum 18...min. belt 38...servo motor

Claims (1)

[Claims] The original image is reduced in size and exposed to light on an image carrier to form a latent image, and after the latent image is developed and transferred onto a transfer material, the transfer material is transferred to a separator provided at one end of the image carrier. What is claimed is: 1. A copying apparatus capable of forming a binding margin on a transfer material by separating it from an image carrier with a belt, the copying apparatus being characterized in that the reduced image of the document is moved to a side of the image carrier opposite to the separating belt.