JPH0786646B2 - Copier with multiple optical systems - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a copying machine having a plurality of optical systems capable of, for example, copying a sheet original and a slide film.

2. Description of the Related Art There are various image forming apparatuses using a process of forming an image by irradiating a light-sensitive material with a light beam. For example, an image forming apparatus using electrophotography in which a charged photoconductor is imagewise exposed to form an electrostatic latent image, the latent image is developed with toner, and the image is transferred and fixed on a recording paper. A photosensitive sheet having a large number of photo-curable microcapsules disclosed in JP-A-58-88739 and JP-A-59-30537 is coated on a support, is image-exposed, and thereafter, pressure is applied to expose the photosensitive sheet. There is an image forming apparatus or the like that destroys uncured microcapsules that have not been irradiated and causes the dye contained in the microcapsules to flow out to cause the image receiving sheet to develop color and form an image.

Various ideas have been made to copy originals of different types, such as a slide film and a sheet original, using these image forming apparatuses.

In JP-A-58-182629 and JP-A-59-198442, when a slide film is copied, a sheet glass original is placed on a platen on which the Fresnel lens is placed. There is disclosed a device for forming an image by placing a screen, a screen, or the like, projecting a film image on the Fresnel lens or the screen, and exposing the projected image to a photoconductor. Further, when copying a sheet original, it is necessary to remove the Fresnel lens, the screen and the like.

Japanese Patent Laid-Open No. 54-103023 has a plurality of document placing portions provided at different positions, and by switching the position of a switching mirror provided in the optical path between the document and the photoconductor, An apparatus is disclosed which can easily copy a document placed at either position.

In such a copying machine having a plurality of original document mounting portions and a plurality of optical systems, the optical paths between the respective original document mounting portions and the photoconductors are partially made common to each other. The structure is miniaturized. However, it may be difficult to make the optical path common in order not to impair the space of the cooling device of the optical system and the cooling effect.

Therefore, in a copying machine using the above-mentioned photosensitive sheet, a copying machine has been proposed in which an exposure plate provided for exposing the photosensitive sheet is angularly displaced to separate the optical paths. This ensures a sufficient space for the cooling device of the optical system, and does not impair the cooling effect.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, in the above-mentioned copying machine, the tip position of the image (latent image) formed on the photosensitive sheet on the exposure plate and the latent image are recorded on the recording paper by angularly displacing the exposure plate. The distance from the transfer position for transferring to is different depending on the optical system. Therefore, it is necessary to individually control the timing of conveying the recording paper to the transfer position for each optical system, which makes the control complicated.

Further, since the photosensitive sheet is pulled or loosened by switching the angle of the exposure plate,
A correction mechanism for correcting tension or slack of the photosensitive sheet is required. The correction mechanism includes, for example, a roller provided in the vicinity of the conveyance path of the photosensitive sheet, and when the photosensitive sheet is loosened, the roller is moved so as to traverse the conveyance path. There is one that rewinds the roller around which is wound if necessary. Therefore, there is a problem that the internal structure of the copying machine becomes complicated.

An object of the present invention is to solve the above technical problems and to provide a copying machine having a plurality of optical systems in which a transporting mechanism of a photosensitive sheet as a transfer belt is simplified.

It is another object of the present invention to provide a copying machine having a plurality of optical systems that can make the recording paper conveyance timing at the time of copying the same even when different optical systems are used.

MEANS FOR SOLVING THE PROBLEMS The present invention is a transfer belt, which is wound from a supply roller to a take-up roller in a machine body and is conveyed along a conveyance path, to which a developer is applied, and the transfer belt. Supporting means for supporting the body from a back side over a predetermined range along the transport direction at a predetermined exposure position of the transport path, and being angularly driven about an axis intersecting the transport direction; First optical means for forming an original image on the belt, second optical means on the transfer belt on the supporting means seen from a different position along the conveying direction from the first optical means, and conveying path with respect to the supporting means The transfer means is provided on the downstream side and includes a transfer means for transferring the latent image of the transfer belt to the recording paper, and the supporting means is provided at the exposure position of the transfer belt on the conveyance path from the supply roller to the take-up roller. Transfer the original image at the downstream end in the transport direction The distance between the stage, the support means is a copying machine having a plurality of optical systems, characterized in that the position of the axis is selected to be the same in a state of being angularly displaced both end positions.

Further, according to the present invention, a transfer belt is wound from a supply roller to a take-up roller in a machine body and is conveyed along a conveyance path, and a developer is applied to the transfer belt, and the transfer belt is provided in the conveyance path. Supporting means is supported from the back side over a predetermined range along the transport direction at a predetermined exposure position, and is driven angularly about an axis intersecting the transport direction, and an original image is transferred to the transfer belt on the support means. First optical means for forming an image; second optical means on the transfer belt on the supporting means viewed from a different position along the carrying direction from the first optical means; and, provided with respect to the supporting means, on the downstream side of the carrying path, A transfer means for transferring the latent image of the transfer belt to the recording paper, and the supporting means angularly displaces the distance of the transfer belt on the conveyance path from the supply roller to the take-up roller to both end positions. The shaft so that they are the same in the Is a copying machine having a plurality of optical systems, wherein the selected position of the.

Operation According to the present invention, the transfer strip having the developer adhered thereto is wound from the supply roller to the take-up roller in the body of the copying machine and is transported along the transport path. Supporting means for supporting the transfer belt from the back side over a predetermined range is provided at a predetermined exposure position on the transport path.
The supporting means is driven to be angularly displaced around an axis line that intersects the transfer belt conveyance direction. Therefore, when the support means is angularly displaced to the one end position, the original image can be formed on the transfer belt on the support means by the first optical means, and the support means is angularly displaced to the other end position. Second
An original image can be formed on the transfer belt by the optical means. Then, the latent image on the transfer belt is transferred to the recording paper by the transfer means.

Here, the supporting means defines the distance between the transfer means and the downstream end of the transfer belt on the conveying path from the supply roller to the take-up roller in the conveying direction of the original image at the exposure position. The position of the axis is chosen so that it is the same when displaced. Therefore, even when a latent image is formed on the transfer belt by using different optical systems, the distance from the leading edge of the original image to the transfer unit is equal, and therefore it is not necessary to change the timing of conveying the recording paper to the transfer unit. . This can simplify the control system of the copying machine.

Further, according to the present invention, the transfer belt to which the developer is applied is wound from the supply roller to the winding roller in the body of the copying machine and is transported along the transport path. Supporting means for supporting the transfer belt from the back side over a predetermined range is provided at a predetermined exposure position on the transport path. The supporting means is driven to be angularly displaced around an axis line that intersects the transfer belt conveyance direction. Therefore, when the support means is angularly displaced to the one end position, the original image can be formed on the transfer belt on the support means by the first optical means, and the support means is angularly displaced to the other end position. Then, the document image can be formed on the transfer belt by the second optical means. Then, the latent image on the transfer belt is transferred to the recording paper by the transfer means.

Here, the supporting means selects the position of the axis so that the distance of the transfer belt on the conveying path from the supply roller to the take-up roller is the same when the supporting means is angularly displaced to both end positions. Therefore, even if different optical systems are used, the length of the transfer strip is the same on the transport path, so that the transfer strip is not stretched or loosened, and the transfer strip tension is not increased. Alternatively, it is not necessary to provide a correction unit for correcting the slack, and the structure of the copying machine can be simplified.

Embodiment FIG. 1 is a sectional view showing the basic structure of a copying machine 1 which is an embodiment of the present invention. A document table 2 is provided on the upper surface of the copying machine 1. The lower surface of the original table 2 is provided with an optical system device including copy lamps 3 and 4, mirrors 5 to 8 and a lens 9. Further, a sensor S14 for detecting the temperature of the document table 2 is provided. Of this optical system device,
The copy lamps 3 and 4 and the mirrors 5 to 8 are mounted on the mirror units 11 and 12, and are reciprocated on the lower surface of the original table 2 made of hard transparent glass or the like and placed on the original table 2. The image of the original 10 is scanned. A sensor for detecting the position of the mirror unit 11 is provided below the mirror unit 11.
S12 is provided. Of the light from the copy lamps 3 and 4, the reflected light from the original 10 passes through the mirrors 5 to 8 and the lens 9 and is distributed to the exposure plate 40 as shown by the chain line in the figure.
The photosensitive sheet 25 on 40 is exposed. Photosensitive sheet of exposure plate 40
A heater 41 is provided on the side opposite to 25. The exposure plate 40 is provided with a rotation shaft 39, and the exposure plate 40 is angularly displaced around the rotation shaft 39 in the arrow C and D directions.

Pressure rollers 46 and 47 are provided at the center of the inside of the copying machine 1 to form a pressure developing device 48. Pressure roller 46
Is urged toward the pressure roller 47 by the auxiliary rollers 61 and 62, and the pressure rollers 46 and 47 are in contact with each other at a predetermined pressure. On the left side of the pressure rollers 46 and 47 in the figure, a cartridge 23 accommodating the photosensitive sheet 25 is attached to the bucket 20. Cartridge 23 made of this light-shielding material
Inside, the photosensitive sheet 25 is wound around the supply roller 24. The photosensitive sheet 25 includes a guide roller 27 and rollers 31,4.
It is led to the pressure developing device 48 via the exposure plate 40 via the sheet 3. The photosensitive sheet 25 that has passed through the pressure developing device 48 is taken up by a take-up roller 28 that is axially supported by the cartridge 23.

A paper cassette 71 is mounted on the side surface of the copying machine 1. The image receiving sheets 73 stored in the paper cassette 71 are fed one by one to the timing roller 49 by the rotation of the paper feeding roller 75. The sensor S2 detects the presence or absence of an image receiving sheet in the paper cassette 71, and the sensor S4 detects the type (sheet size) of the paper cassette 71. In the vicinity of the timing roller 49,
An image receiving sheet double feed detection sensor S7 is provided.

The timing roller 49 starts rotating at a predetermined timing and guides the image receiving sheet 73 to the pressure developing device 48. As a result, the image receiving sheet 73 passes through the pressure developing device 48 together with the photosensitive sheet 25, passes through the conveying roller 50 and the glossing device 51, and is ejected to the paper ejection tray 57 by the paper ejection roller 56. An image receiving sheet detection sensor S8 is provided between the transport roller 50 and the glossing device 51, and an image receiving sheet detection sensor S9 is provided near the paper discharge roller 56.

A slide projector 100 is mounted near the center of the side surface of the copying machine 1. The slide projector 100 includes a copy lamp 101, a slide holder 102, and a projection lens 104 inside. The slide holder 102 holds the slide film 103. The copy lamp 101 and the projection lens 104 are the first
As shown by the chain double-dashed line in the drawing, the linear arrangement is performed with respect to the exposure plate 40. The slide holder 102 moves in the direction perpendicular to the optical axis indicated by the chain double-dashed line, and the slide film 103 is slit-exposed by the copy lamp 101.

When the image of the original 10 placed on the original table 2 is copied in the copying machine 1 configured as described above, the reflected light from the original is the first light of the copy lamps 3 and 4. As shown by the alternate long and short dash line in the figure, the light is distributed to the exposure plate 40 via the mirrors 5 to 8 and the lens 9. The leading edge position of the original image on the exposure plate 40 in the original copy mode is indicated by reference numeral P1.

The photosensitive sheet 25 is a photosensitive pressure-sensitive material, and a large number of microcapsules having a particle size of about 10 to 20 μm containing a leuco dye and a photocurable substance are coated on the surface of a light-reflective metal sheet such as aluminum. A selectively cured image is formed on the photosensitive sheet 25 which is irradiated with the reflected light from the original on the exposure plate 40. Photosensitive sheet on which this selectively cured image is formed
The image receiving sheet 73 is pressed together with 25 at the pressure developing position b of the pressure developing device 48. Due to this pressurization, the uncured microcapsules on the photosensitive sheet 25 are destroyed, and the leuco dye contained therein leaks onto the image receiving sheet 73. On the image receiving sheet 73, a developing material which causes a color reaction by mixing with a leuco dye is applied, and an image is formed on the image receiving sheet 73 which has passed through the pressure developing device 48. The surface of the image receiving sheet 73 is coated with a developing material as well as a thermoplastic resin, and the thermoplastic resin is used as the glossing device 51.
It is heated and melted to give gloss to the image.

On the other hand, when copying the image on the slide film, the exposure plate 40 moves to the position indicated by the phantom line in FIG. 1 to form an optical path from the copy lamp 101 to the exposure plate 40. As a result, the light of the copy lamp 101 that has passed through the slide film 103 is distributed to the exposure plate 40 via the projection lens 104. The leading edge position of the original image in the slide copy mode on the exposure plate 40 is indicated by reference numeral P2.

In the copy mode of the image on the slide film 103, the copy lamps 3 and 4 are off, and a selectively cured image of the image on the slide film 103 is formed on the photosensitive sheet 25.
Therefore, by operating a device other than the optical system device including the copy lamps 3, 4 etc. at the same time as copying the image of the document 10 placed on the document table 2, the image receiving sheet 73
The image of the slide film 103 can be copied on top.

Various processing operations in the above copying machine will be described below.

Initial setting of photosensitive sheet A new cartridge 23 is set in the bucket 20, a leader sheet provided at the tip of the photosensitive sheet 25 is set on the tractor roller 31, the bucket 20 is set at the mounting portion 21, and the front cover is closed. As a result, the front cover open / close detection sensor S1 is turned on, the photosensitive sheet take-up roller 28, the pressure roller 47, and the tractor roller 31 are rotated, and the leader sheet is wound around the take-up roller 28. When the winding is completed, the winding detection sensor S3 is turned on. After that, the pressure of the pressure roller 46 is released, a predetermined amount of the photosensitive sheet 25 is conveyed, and the initial setting of the photosensitive sheet 25 is completed. When the photosensitive sheet is conveyed, the sensitivity information sensor S10 reads the mark relating to the sensitivity information of the photosensitive sheet 25 attached to the back surface of the leader sheet, and switches the reference position of the color correction filter provided in the optical path according to the data. .

Pre-processing operation The pre-processing operation is performed when the front cover is closed after the jam is removed.
This is performed when the print switch 88 is operated or the power switch is turned on. When the sensor S11 detects that the buffer roller 43 is not at the home position, the pressure of the pressure developing device 48 is released,
The buffer roller 43 is moved in the arrow B direction, the winding roller 28 is rotated, and the buffer roller 43 is moved to the home position.

Exposure operation The photosensitive sheet pressing member 80 provided between the buffer roller 43 and the pressure developing device 48 fixes the photosensitive sheet 25 so that it does not move, and the photosensitive sheet supply roller 24 is free to rotate (a certain amount of friction does not occur). Is set),
The buffer roller 43 is moved in the direction of arrow A, and the image of the original 10 is slit-exposed on the photosensitive sheet 25 on the exposure plate 40. Here, since the sensitivity of the photosensitive sheet 25 varies depending on the temperature, the temperature of the exposure plate 40 is controlled by the heater 41 so as to reach a predetermined temperature. The temperature of the exposure plate 40 is detected by the sensor S13. The exposure scanning length is determined by the size of the image receiving sheet 73 and the copy magnification.

Between exposure operation and pressure development When exposure scanning is completed, the photosensitive sheet by the pressing member 80
With the fixing of 25 fixed and the rotation of the supply roller 24 fixed, the take-up roller 28 is rotated and the buffer roller 43 is moved in the arrow B direction at a predetermined speed V1. Since the take-up roller 28 is provided so as to slip with the drive source thereof, the photosensitive sheet 25 is always tensioned and conveyed at the speed of the buffer roller 43.

Next, after the buffer roller 43 starts moving in the arrow B direction, when a predetermined period T1 has elapsed, the timing roller 49 is rotated to convey the image receiving sheet 73 to the pressure developing device 48. Furthermore, after the lapse of the period T2 (when the front end of the image receiving sheet 73 reaches the pressure developing device 48), the movement of the buffer roller 43, the rotation of the winding roller 28, and the rotation of the timing roller 49 are stopped, and the photosensitive sheet 25 and In a state where the conveyance with the image receiving sheet 73 is stopped, the rotation lock of the supply roller 24 is released and the pressure roller 46 is pressed.

Pressure development operation After completion of pressurization of the pressure roller 46, the pressure roller 47 is rotated at the pressure development speed V3, and the buffer roller 43 is rotated at the pressure development speed V3.
Move at speed V1 less than 1/2. As a result, a constant tension can be applied to the photosensitive sheet 25 at all times,
The slack and wrinkle of the photosensitive sheet 25 are prevented.

When the buffer roller 43 moves to the home position,
The driving of the buffer roller 43 is stopped, and the photosensitive sheet 25 is conveyed only by the pressure developing device 48. Next, when it is determined by the timer and the outputs of the sensors S5 and S6 that the rear end of the image receiving sheet 73 passes through the pressure developing device 48, the pressure of the pressure developing device 48 is released.

Post-Processing Operation The pressure-transferred image-receiving sheet 73 is heated by the glossing device 51 to be subjected to gloss processing and color development processing. On the other hand, the used photosensitive sheet 25 is wound around the winding roller 28.

Slide Copy Mode When the exposure plate 40 is moved to a position indicated by a virtual line by a manual lever provided inside the front cover, the slide copy mode is switched. The position of the exposure plate 40 is determined by the sensors S15 and S16.
Is detected by the output of. Then, by operating the print switch 88, the copy lamp 101 is turned on, the slide film 103 moves, and the image of the slide film 103 passes through the lens 104 to slit expose the photosensitive sheet 25 on the exposure plate 40.

Color correction The insertion amount of the color correction filter provided in the lens 9 according to the input of the color adjustment key provided on the operation panel and the sensitivity polarity of the photosensitive sheet 25 (mark attached to the reader sheet). To adjust the color.

Detection of Remaining Amount of Photosensitive Sheet The rotation amount (rotation time) of the pressure roller 47 is measured, and the remaining amount is calculated according to the measurement. When the sensor S10 detects the end mark on the back surface of the photosensitive sheet 25 near the end, the copying operation being executed at that time is completed, and the execution of the next copying operation is prohibited.

Cooling of optical system A cooling fan 90 for cooling the copy lamps 3 and 4 and the document table 2 is attached to the moving means (wire) of the mirror unit 11. The cooling fan 90 is operated during scanning of a document and movement of the optical system to cool the optical system.

Image Receiving Sheet Detection Since the surface of the image receiving sheet 73 is coated with a developing material (acid) that develops the leuco dye contained in the microcapsules, the front surface and the back surface have different reflectances. Utilizing this difference in reflectance, a pair of reflective optical sensors
Distinguish between paper and OHP sheet by the difference in output between S5 and S6,
Also, the front and back of each sheet are detected.

FIG. 2 is a perspective view for explaining the angular displacement mechanism of the exposure plate 40. A rotary shaft 39 is provided at an end of the exposure plate 40 on the downstream side in the transport direction of the photosensitive sheet 25. Both ends of the rotary shaft 39 are pivotally supported by the frames 38a and 38b, respectively. Both ends in the width direction of the upstream end of the exposure plate 40 in the conveyance direction of the photosensitive sheet 25 are fixed to support members 32 provided near both ends of the rotary shaft 30 of the tractor roller. Both ends of the rotary shaft 30 are inserted into guide holes 37a and 37b formed in the frames 38a and 38b, respectively, and a switching lever 33 is provided at one end 30a of the rotary shaft 30. By operating the switching lever 33, the rotary shaft 30 moves along the guide holes 37a and 37b, whereby the exposure plate 40 is angularly displaced about the rotary shaft 39.

FIG. 3 is a perspective view showing a fixing mechanism of the rotary shaft 30. In the vicinity of the tractor roller 31 of the frame 38a in which the guide hole 37a is formed, a pressing member 35 extending over both angular displacement positions of the rotary shaft 30 is provided.
Are placed. The pressing member 35 is vertically urged by a spring 34. On the opposite side of the pressing member 35 from the spring 34, recesses 36a and 36b into which the rotary shaft 30 is fitted are formed.
Therefore, for example, in the slide copy mode,
The rotary shaft 30 is fitted into the recess 36b, and the pressing member 35 is vertically pressed by the spring 34, so that the rotary shaft 30 is rotated.
30 is fixed.

In the original copy mode, the rotary shaft 30 is not
The rotary shaft 30 is fixed by being fitted in a and pressing the pressing member 35 in the vertical direction by the spring 34.
Such a pressing member is also arranged on the guide hole 37b side.

Sensors S15 and S16 for detecting the rotary shaft 30 are provided near the recesses 36a and 36b, respectively, and the fixed position of the rotary shaft 30, that is, the angular displacement position of the exposure plate 40 is detected by the outputs of these sensors. Then, the copy mode is determined.

FIG. 4 is a block diagram showing an electrical configuration of the copying machine 1. CPU 81 is connected to sensor S1 through I / O interface 84.
The detection signal of S16 is input.

A panel controller 87 is connected to the CPU 81 via an I / O interface 84. This panel controller
Reference numeral 87 controls the input and output of signals on the operation panel provided in the copying machine 1. The operation panel includes, for example, a mode display lamp 90, a print switch 88 and a warning lamp 89.
Etc. are provided. The mode display lamp 90 is lit when the slide film copy mode using the slide projector 100 is selected. The print switch 88 is a switch for instructing the start of a copying operation. Warning light 89
Lights up when it is detected that, for example, the mounting condition of the slide film 103 is abnormal, and displays the pattern to the operator.

The CPU 81 controls the dimming unit 86 and the like based on the input data from the print switch 88 and the sensors S1 to S16 according to a program written in advance in the ROM 82 to control the copying operation. Copy lamps 3, 4, 101 are included in the dimming unit 86.
Is connected, and the dimming unit 86 controls the turning on / off of the copy lamps 3, 4, 101 according to the control signal. A part of the memory area of the RAM 83 connected to the CPU 81 is assigned to a working area for outputting control data.

FIG. 5 is a flow chart for explaining the copy mode determination operation in the copying machine 1. In step c1,
The copying machine 1 enters a standby state when the power is turned on or the jam processing is completed. At step c2, it is judged whether or not the slide copy mode is set. The determination of the copy mode depends on the fixed position of the rotary shaft 30, that is, the sensor S15,
It is determined by the output of S16. In the slide copy mode, the process proceeds to step c3, the copy lamp 101 is turned on, and the copy lamps 3 and 4 are turned off. When not in the slide copy mode, that is, in the document copy mode,
In step c4, the copy lamps 3 and 4 are turned on and the copy lamp 101 is turned off.

As described above, according to the present embodiment, the distance from the leading end position P1 of the original image in the original copy mode to the pressure developing position b and the leading end position P2 of the original image in the slide copy mode.
Since the exposure plate 40 is angularly displaced so that the distance from the pressure developing position b to the pressure developing position b is the same, it is not necessary to change the conveyance timing of the image receiving sheet 72 to the pressure developing position b for each copy mode. , Control systems such as image receiving sheets
A program for controlling the transfer timing of 72 is simplified, and copy control can be easily performed.

In this embodiment, the rotary shaft 39 is the photosensitive sheet of the exposure plate 40.
Although it is provided at the downstream end of the conveying direction of 25, if it is between the leading end position P1 of the original image in the original copy mode and the leading end position P2 of the original image in the slide copy mode to the pressure developing position b, It may be at any position, and for example, the exposure plate 40 may be angularly displaced about the rotation axis of the buffer roller 43.

FIG. 6 is a sectional view for explaining another embodiment of the present invention. This embodiment is similar to the above-mentioned embodiment, and the same reference numerals are given to corresponding components. The feature of this embodiment is that the rotary shaft 39 for angularly displacing the exposure plate 40
This is provided at the midpoint of the length of the photosensitive sheet 25 in the conveyance direction at 40.

FIG. 7 is a perspective view for explaining the angular displacement mechanism of the exposure plate 40. A rotary shaft 39 is provided at the midpoint of the length of the exposure plate 40 in the conveyance direction of the photosensitive sheet 25. Both ends of the rotating shaft 39 are
The frames 38a and 38b are pivotally supported. Exposure plate 40
Both ends of the photosensitive sheet 25 in the width direction on the upstream side in the conveying direction are fixed to support members 32 provided near both ends of the rotary shaft 30 of the tractor roller 31, respectively. Both ends of the rotary shaft 30 have guide holes 37a, 3a formed in the frames 38a, 38b, respectively.
A switching lever 33 is provided at one end 30a of the rotary shaft 30 which is inserted through the 7b.

Further, both end portions in the width direction of the exposure plate 40 on the downstream side in the transport direction are fixed to support members 45 provided near both end portions of the rotation shaft 44 of the buffer roller 43, respectively. Both ends of the rotating shaft 44 are inserted into guide holes 65a and 65b formed in the frames 38a and 38b, respectively. Therefore, by operating the switching lever 33, the rotary shaft 30 moves along the guide holes 37a, 37b, and the rotary shaft 44 moves along the guide holes 65a, 65b, whereby the exposure plate 40 is rotated. It is angularly displaced around 39. The fixing mechanism at both end positions of the rotational displacement of the rotary shaft 30 is the same as the structure shown in FIG.

As described above, according to the present embodiment, since the exposure plate 40 is angularly displaced about the midpoint of the length of the exposure plate 40 in the transport direction, the exposure plate 40 is angularly displaced. Photosensitive sheet 25 supply roller 24 to take-up roller 28
Are equal in length. Therefore, when the exposure plate 40 is angularly displaced to switch the copy mode, the photosensitive sheet 25 will not be pulled or loosened. As a result, it is not necessary to provide a correction means for correcting the tension or slack of the photosensitive sheet 25, and the structure of the copying machine is simplified.

EFFECTS OF THE INVENTION As described above, according to the present invention, the supporting means for supporting the transfer belt is arranged so that the original image is conveyed in the conveying direction on the conveying path from the supply roller to the take-up roller at the exposure position. The position of the axis is selected so that the distance between the downstream end and the transfer means is the same when the supporting means is angularly displaced to both end positions. Therefore, even when a latent image is formed on the transfer belt using different optical systems, the distance from the leading edge of the original image to the transfer means is the same, and therefore it is not necessary to change the timing of conveying the recording paper to the transfer means. . This can simplify the control system of the copying machine.

Further, according to the present invention, the supporting means for supporting the transfer belt is the same in the distance of the transfer belt on the conveyance path from the supply roller to the take-up roller when the supporting means is displaced to both end positions. Thus, the position of the axis is chosen. Therefore, even if different optical systems are used, the length of the transfer strip is the same on the transport path, so that the transfer strip is not stretched or loosened, and the transfer strip tension is not increased. Alternatively, it is not necessary to provide a correction unit for correcting the slack, and the structure of the copying machine can be simplified.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view showing a basic structure of a copying machine 1 which is an embodiment of the present invention, and FIG. 2 is a perspective view for explaining an angular displacement mechanism of an exposure plate 40. FIG. 3 is a perspective view showing the fixing mechanism of the rotary shaft 30, FIG. 4 is a block diagram showing the electrical configuration of the copying machine 1, and FIG. 5 is a flow chart for explaining the copy mode selecting operation in the copying machine 1. FIG. 6 is a cross-sectional view showing another embodiment of the present invention, and FIG. 7 is a perspective view for explaining another angular displacement mechanism of the exposure plate 40. 1 ... Copier, 3,4,101 ... Copy lamp, 24 ... Supply roller, 25 ... Photosensitive sheet, 28 ... Take-up roller, 30, 39,
44 ... Rotary shaft, 31 ... Tractor roller, 32,42 ... Supporting member, 33 ... Switching lever, 34 ... Spring, 35 ... Pressing member, 36a, 36b ... Recess, 37a, 37b, 65a , 65b …… Guide hole, 3
8a, 38b …… frame, 40 …… exposure plate, 43 …… buffer roller

Claims (2)

[Claims] 1. A transfer belt, which is wound from a supply roller to a take-up roller in a machine body and is conveyed along a conveying path, to which a developer is applied; Supporting means is supported from the back side over a predetermined range along the transport direction at a predetermined exposure position, and is driven angularly about an axis intersecting the transport direction, and an original image is transferred to the transfer belt on the support means. A first optical means for forming an image; a second optical means on the transfer belt on the supporting means viewed from a different position along the conveying direction from the first optical means; and a second optical means provided downstream of the supporting means with respect to the supporting means. A transfer means for transferring the latent image of the transfer belt to the recording paper, and the supporting means is downstream in the conveyance direction of the original image at the exposure position of the transfer belt on the conveyance path from the supply roller to the take-up roller. Set the distance between the edge and the transfer There copying machine having a plurality of optical systems, characterized in that the position of the axis is selected to be the same in a state of being angularly displaced both end positions. 2. A transfer belt, which is wound from a supply roller to a take-up roller inside the machine body and is conveyed along a conveyance path, to which a developer is adhered, and the transfer belt body in the conveyance path. Supporting means is supported from the back side over a predetermined range along the transport direction at a predetermined exposure position, and is driven angularly about an axis intersecting the transport direction, and an original image is transferred to the transfer belt on the support means. A first optical means for forming an image; a second optical means on the transfer belt on the supporting means viewed from a different position along the conveying direction from the first optical means; and a second optical means provided downstream of the supporting means with respect to the supporting means. A transfer means for transferring the latent image of the transfer belt to the recording paper, and the supporting means angularly displaces the distance of the transfer belt on the conveyance path from the supply roller to the take-up roller to both end positions. So that the same axis Copying machine having a plurality of optical systems, wherein a position is selected.