JP4186120B2 - Photographic paper transport device - Google Patents

Description

  The present invention includes a first exposure driving roller and a first exposure pressure roller disposed on the upstream side in the transport direction of the exposure head in order to pressure-carry and convey the photographic paper during exposure of the photographic paper by an exposure head that exposes an image on the photographic paper. A second exposure conveyance roller unit, and a second exposure drive roller and a second exposure pressure roller disposed downstream of the exposure head for pressure-carrying and conveying the photographic paper during exposure of the photographic paper. The present invention relates to a photographic paper transport device including a transport roller unit.

  In recent years, photographic paper exposure using an optical print head having an exposure range extending in the main scanning direction has been adopted as an exposure head such as a digital minilab (photo printing apparatus). At that time, the optical print head is fixed and this optical head is fixed. The photographic paper is transported in the sub-scanning direction orthogonal to the main scanning direction of the optical print head by the first and second exposure transport roller units, which are arranged on both sides of the print head, and are composed of an exposure driving roller and an exposure pressure roller, Sequential line exposure is performed to complete the surface exposure of the entire image. In the case of such an exposure method, if a disturbance occurs in the conveyance of the photographic paper during the exposure, it will appear as an uneven exposure and appear in the finished print. Therefore, the plurality of exposure conveyance roller units constituting the photographic paper conveyance device are It is manufactured with high accuracy so that the photographic paper can be securely sandwiched and transported at a stable transport speed.

However, in the exposure method as described above, it is necessary to transfer the photographic paper transport from the first exposure transport roller unit to the second exposure transport roller unit in the exposure process, in which the second exposure transport roller unit The pressure roller is switched from the released state to the pressure-bonding (clamping) conveyance state, and then the pressure roller of the first exposure conveyance roller unit is switched from the pressure-bonding (nipping) conveyance state to the released state. It was often observed that exposure unevenness occurred due to slight shaking of the photographic paper during delivery. This is presumably because the photographic paper, which has become free for a moment, is slightly shaken when the pressure roller is switched from the pressure-bonding (clamping) conveyance state to the release state.
In view of the above situation, an object of the present invention is to provide a photographic paper transport device capable of controlling a pressure roller without giving a sudden load fluctuation to a photographic paper being exposed.

In order to solve the above-described problems, the photographic paper transport device according to the present invention is disposed upstream of the exposure head in the transport direction in order to pressure-carry and transport the photographic paper during exposure of the photographic paper by the exposure head that exposes an image on the photographic paper. A first exposure transport roller unit including a first exposure drive roller and a first exposure pressure roller; and a second exposure drive roller disposed on the downstream side of the exposure head for pressure transporting the photographic paper during exposure of the photographic paper. And a second exposure pressure roller. The first exposure pressure roller is displaceable in a perspective direction with respect to the first exposure drive roller, and the second exposure pressure roller Is displaceable in the perspective direction with respect to the second exposure driving roller, and includes a cam mechanism including a first rotating cam body for determining a displacement position of the first exposure pressure roller, and the first exposure. Wearing roller has the and the cam control means for controlling the rotation angle of the momentary first rotary cam member provided to determine the rate of displacement in the direction of access to the first exposure driving roller, the first rotating The cam body is formed with an inclined surface for displacing the first exposure pressure-bonding roller from the pressure-bonding position to the micro-pressure-bonding release position, and the cam control means creates a plurality of different micro-pressure-bonding release positions with a rotation angle of the first rotating cam body. The control value corresponding to is stored, and the momentary rotation angle of the first rotating cam body, which is determined based on the rotation angle that creates the optimum micro-crimp release position selected from the plurality of rotation angles, is controlled. the first exposure pressing rollers the speed of displacement of the said optimal micro pinch release position from the crimping position is determined by.
In this case, the minute pressure release position is different from the complete pressure release position in that the distance from the first exposure drive roller is set to about several tenths of a millimeter, and the photographic paper being exposed is completely released. The distance from the first exposure driving roller is not large. The pressure release position is intended to avoid uneven exposure caused by completely releasing the photographic paper being exposed.

In this configuration, when the first exposure pressure roller is released from the first exposure pressure roller unit in the transfer process of conveying the photographic paper from the upstream first exposure conveyance roller unit to the downstream second exposure conveyance roller unit, that is, from the compression position to the minute pressure release position. Rotation of the first rotating cam body having an inclined surface that produces a displacement from the pressure-bonding position of the first exposure pressure-bonding roller to the micro-pressure-bonding release position, with the displacement speed that determines the desired displacement position from moment to moment This is achieved by controlling the corners. As a result, it is possible to create an optimal displacement position per time at the time of releasing the press-bonding in the combination of the exposure head and the photographic paper transport device that is used (guaranteed sufficient quality photo print). Furthermore, the cam control means stores a control value corresponding to the rotation angle of the first rotating cam body that creates a plurality of different micro-compression release positions, and based on the rotation angle that produces an optimum micro-compression release position selected from these values. By controlling the rotation angle of the first rotating cam body determined every moment, it is possible to determine the speed at which the first exposure pressure-bonding roller is displaced from the pressure-bonding position to the optimum minute pressure-bonding release position. As a result, it is possible to set an optimal micro-bonding release position that varies depending on the assembly accuracy, the accuracy of each component, or changes with time, and to displace the first exposure pressure-bonding roller at a speed corresponding thereto.

Furthermore, since the second exposure pressure roller must be pressure-bonded to the photographic paper being exposed, it is necessary to avoid giving unnecessary impact to the photographic paper being exposed. Therefore, the second exposure pressing rollers as cam surface of the second rotary cam member to form an inclined surface so that the speed of displacement of the crimping position gradually becomes slower is one of the preferred embodiments of the present invention is there.
Other features and advantages of the present invention will become apparent from the following description of embodiments with reference to the drawings.

  FIG. 1 shows a schematic block diagram of a printer processor known as a so-called digital minilab. A digital exposure type is adopted for the exposure part of this digital minilab, and a film for reading a photographed image from an image frame of a photographic film (hereinafter simply referred to as film) 1 developed by a film developing machine not shown here. A scanner 3, a controller 7 that processes digital image data read through the film scanner 3 to create print data, and an exposure head 5 a that exposes an image corresponding to the frame image on the photographic paper 2 based on the print data. And a development processing unit 6 for developing the exposed photographic paper 2. The photographic paper 2 developed by the development processing unit 6 is discharged as a finished print through a drying process.

  The film scanner 3 determines an illumination optical system 30, an imaging optical system 40, a photoelectric conversion unit 50 using a line CCD sensor 51 as a photoelectric conversion element, a light irradiation range on the film 1 as main components, and the film 1. Is provided with an auto film mask 10 for transporting in the sub-scanning direction for scanning by a line CCD sensor.

  The illumination optical system 30 includes a halogen lamp 31 as a white light source, a dimming filter 32, a mirror tunnel 33, and the like, and irradiates the film 1 with a color distribution and an intensity distribution of a light beam from the light source. An imaging optical system 40 that processes a transmitted light beam from the film 1 includes a lens unit 41 and a mirror 42 that changes the direction of light.

  The photoelectric conversion unit 50 that photoelectrically converts the light beam guided by the imaging optical system 40 includes three CCD sensors 51a, 51b, and 51c assigned to detect each color of RGB as the line CCD sensor 51. Each CCD sensor has a large number (for example, 5000) of CCD elements arranged in the main scanning direction, that is, the width direction of the film 1. A color filter that passes only the red component of the light transmitted through the film 1 passes through the imaging surface of the red CCD sensor 51a, and only a green component of the light transmitted through the film 1 passes through the imaging surface of the green CCD sensor 51b. The color filter is provided with a color filter that passes only the blue component of the light transmitted through the film 1 on the imaging surface of the blue CCD sensor 51c, and photoelectrically converts only the blue component, the red component, and the green component, respectively. .

  When the frame image of the film 1 is positioned at the scan position set in the auto film mask 10, the frame image reading process is started, and the transmitted light of the frame image is sent by the film 1 by the film transport mechanism 9. The images are sequentially read by the three CCD sensors 51a, 51b, and 51c. Since the CCD sensors are arranged at intervals of several pixels along the conveyance direction of the film 1, R, G, and G in the same pixel are arranged. There is a time difference in the detection timing of each of the component colors. This is because the R, G, B image signals of the same pixel are associated with each other by the signal processing in the subsequent stage of the photoelectric conversion unit 50 and stored in a predetermined memory of the controller 7. Stored. Such control of the illumination optical system 30, the imaging optical system 40, and the photoelectric conversion unit 50 of the film scanner 3 is performed by the controller 7.

  In this embodiment, the digital print unit 5 employs a PLZT shutter system. That is, as the exposure head 5a, a shutter array made up of PLZT elements is adopted. This shutter array consisting of PLZT elements is composed of a transparent ferroelectric ceramic material obtained by adding lanthanum to lead zirconate titanate and uses the electro-optic effect of the material. Light of each color of R, G, and B is introduced from the light source 5b through many optical fibers. This shutter array extends along the width direction of the photographic paper 2, that is, the transverse direction of the transport direction. When a predetermined level of voltage is applied to each shutter, a light transmission state is established, and when application of the voltage is stopped, a light blocking state is established. Accordingly, when a driving voltage is applied from the controller 7 to the shutter corresponding to each pixel based on the print data, the shutter is opened and light of the color introduced from the light source is irradiated onto the photographic paper 2. The light source 5b is provided with a rotation filter composed of optical filters of three colors R, G, and B. By controlling the rotation phase of the rotation filter, one of R, G, and B is selectively selected. Opposing the light source, the light of the selected color is sent to the shutter through the optical fiber through the color filter. In addition to the PLZT shutter method, there are known methods such as a liquid crystal shutter method, a fluorescent beam method, a FOCRT method, and a DMD (digital micromirror device) method. Can do.

  Since the digital printing unit 5 can simultaneously expose the cut photographic papers 2 arranged in two rows, the photographic paper transport line 8 includes a photographic paper supply line 8A for transporting the cut photographic paper 2 in a single row, and a cut print. The print 2 is divided into an exposure conveyance line 8B and a development conveyance line 8C that can convey the paper 2 in two rows, and the prints sequentially sent from the photographic paper supply line 8A between the photographic paper supply line 8A and the exposure conveyance line 8B. A sorting device 4 that sorts the paper 2 into each row of the exposure transport line 8B is provided.

  The photographic paper supply line 8A is composed of a drawing roller group for selectively pulling out the photographic paper 2 from either one of the two photographic paper magazines 2A and 2B in which the photographic paper 2 is stored in a roll shape with the emulsion surface facing outward. The drawer transport unit and a pre-sorting transport unit that delivers the photographic paper 2 to the sorting device 4 are configured.

  A paper cutter 12 for cutting the photographic paper 2 drawn out from the photographic paper magazine 2 </ b> A or 2 </ b> B according to the print size is provided at the upstream end of the pre-sorting transport unit, and is located downstream of the paper cutter 12. A back print unit 13 is provided. The back print unit 13 prints a film ID, a frame number, correction information indicating image processing performed at the time of print data creation, and the like on the back surface (non-emulsion surface) of the photographic paper 2, and is usually dot-in-pack. The printer is used.

  The exposure transport line 8B is the first on the entrance side that is arranged so as to sandwich the exposure head 5a of the digital print unit 5 and the intermediate transport roller unit 80C constituting the two carry-in areas of the exposure transport line 8B in the order of the transport direction. The first exposure transport roller unit 80A and the second exposure transport roller unit 80B on the exit side are provided, but the first exposure transport roller unit 80A and the second exposure transport roller unit 80B on the exit side that have a great influence on the exposure quality are provided. Is manufactured with high accuracy as an integral unit as the photographic paper transport device 80 for exposure.

  As shown in FIG. 2, the first exposure transport roller unit 80A has a first exposure drive roller 81 that contacts the non-emulsion surface side of the cut photographic paper 2 and a first exposure drive roller 81 that is displaceable from the first exposure drive roller 81. The first exposure pressure roller 82 and the second exposure transport roller unit 80B can be displaced in the near and far direction with respect to the second exposure drive roller 83 contacting the non-emulsion surface side of the cut photographic paper 2 and the second exposure drive roller 83. A second exposure press roller 84 is provided. The first and second exposure driving rollers 81 and 83 are synchronously driven via a belt transmission mechanism 89a by a single driving pulley 89 connected to a motor. The first and second exposure pressure-bonding rollers 82 and 84 are displaced by the cam mechanism 60 independently of the opposing exposure driving rollers 81 and 83, respectively. As a result, only the first exposure transport roller unit 80A, Alternatively, the photographic paper 2 can be transported only by the second exposure transport roller unit 80B and by both the first and second exposure transport roller units 80A and 80B.

  The sorting device 4 includes a chucker-type XY movement mechanism that receives the photographic paper 2 cut by the paper cutter 12 and alternately transfers it to the left and right row positions of the intermediate conveyance roller unit 80C. Of course, when handling a wide large photographic paper 2, exposure is performed in one row, so the photographic paper 2 received from the photographic paper supply line 8 </ b> A is simply delivered to the intermediate conveyance roller unit 80 </ b> C as it is.

Next, the photographic paper transport device 80, in particular, the cam mechanism 60 will be described in detail with reference to FIGS.
Both ends of the rotation shaft 85a of the first exposure pressure roller 82 are supported by the housing 80a so as to be swingable around the swing axis 87a so that the first exposure pressure roller 82 can be displaced from the first exposure driving roller 81. Is supported by a swinging arm 86a. Similarly, both ends of the rotation shaft 85b of the second exposure pressure roller 84 are supported by a swing arm 86b supported by the housing 80a so as to be swingable around the swing shaft core 87b. By this swinging, the first and second exposure pressure-bonding rollers 82 and 84 are completely separated from the photographic paper 2 from the pressure-bonding position for pressing the photographic paper 2 passing between the first and second exposure driving rollers 81 and 83. It can be displaced to the complete crimp release position. The swing arms 86a and 86b are both biased by the spring 88 so as to displace the first and second exposure pressure-bonding rollers 82 and 84 in the pressure-bonding direction.

  The cam mechanism 60 that swings and displaces the first and second exposure pressing rollers 82 and 84 includes a first rotating cam body 61 for the first exposure pressing roller 82 and a second rotating cam for the second exposure pressing roller 84. A body 62 and a support shaft 65 that supports these rotary cam bodies so as to be freely rotatable are provided. A bearing (not shown) is interposed between the support shaft 65 and the rotary cam bodies 61 and 62. A first cam follower 63 that follows the movement of the first rotating cam body 61 as an eccentric cam while rolling on the cam surface formed on the peripheral surface of the first rotating cam body 61 extends to one side of the rotating shaft 85a. It is attached to the end of the extension. In order to perform the same function, a second cam follower 64 that follows the movement of the second rotating cam body 62 is also attached to the end of the extended portion that extends to one side of the rotation shaft 85 b of the second exposure pressure roller 84. Yes.

  The first rotating cam body 61 and the second rotating cam body 62 are arranged side by side in the axial direction, and are connected to each other by connecting means 68, here, a pin 68a and a recess 68b for receiving the pin 68a. In other words, the pin 68a is erected on the side surface of the first rotating cam body 61 facing the second rotating cam body 62, and the second rotating cam so that the free end of the pin 68a can enter. A recess 68 b is formed on the side surface of the body 62. The recess 68b is a groove extending in an arc shape centering on the axis of the support shaft 65, and has a length having a central angle of about 270 degrees.

  A timing belt gear 66 is formed on the side of the first rotating cam body 61 opposite to the second rotating cam body 62 and is controlled by a cam control means 70 built in the controller 7. The rotational displacement of the cam operation pulse motor 67 is transmitted to the gear portion 66 via the timing belt transmission mechanism 69. Since the recess 68b is an arc centered on the axis of the support shaft 65, the first rotary cam body 61 and the second rotary cam body 62 are rotated relative to each other only within a range in which the pin 68a moves through the recess 68b. It has come to forgive. As long as the first rotating cam body 61 rotates in one direction, usually counterclockwise in FIG. 3 (arrow A direction), the pin 68a is always in contact with the end of the recess 68, so 61 and the second rotating cam body 62 integrally rotate together, so that the rotational angle positions of the first rotating cam body 61 and the second rotating cam body 62 do not deviate, but the first rotating cam body is necessary. When 61 rotates in the reverse direction by a predetermined amount less than the length of the recess 68b from the rotation in one direction, the relative position of the first rotating cam body 61 and the second rotating cam body 62 changes, and during the one rotation described above, Combination pattern of the rotation angle positions of the first rotation cam body 61 and the second rotation cam body 62 that has not been realized, and as a result, a combination pattern of the perspective positions of the first and second exposure pressure-bonding rollers 82 and 84 with respect to the photographic paper 2 Can be realized. A presser that realizes a frictional connection with a slight force between the support shaft 65 and the second rotating cam body 62 so that the second rotating cam body 62 does not rotate when the first rotating cam body 61 rotates in the reverse direction. A spring unit 65a is provided.

  Next, using the operation schematic diagrams of FIGS. 5 to 11 and the rotation angle chart of FIG. 12, the rotation angles of the first and second rotating cam bodies 61 and 62 depending on the transport position of the photographic paper 2 to be exposed. The state of the change and the perspective displacement of the first and second exposure press rollers 82 and 84 will be described. In the rotation angle chart of FIG. 12, in the first rotating cam body 61 and the second rotating cam body 62, the position of a predetermined cam surface is determined as the reference position RP, and the first position is set to the reference position RP. The rotation angle is 0 ° where the second cam followers 63 and 64 face each other, the diameter of the first and second rotating cam bodies 61 and 62 change as the rotation occurs, and the corresponding exposure drive. The amount of displacement with respect to the roller (range from the crimped state to the fully crimped released state) is shown.

  First, the photographic paper 2 to be exposed is conveyed by the intermediate conveyance roller unit 80C. In order to receive the leading end of the photographic paper 2, the first exposure pressure roller 82 has an interval of several millimeters from the first exposure driving roller 81. This is the opened complete crimp release position, which is realized by the rotational angle relationship in which the reference position RP of the first rotating cam body 61 contacts the first cam follower 63. In FIG. 12, this rotation angle is set to 0 °. Similarly, at this time, the reference position RP of the second rotating cam body 62 faces the second cam follower 64, and the second exposure pressure roller 84 is in a pressure contact position where it contacts the first exposure drive roller 83. (See FIG. 6).

  When the leading edge of the photographic paper 2 enters the first exposure conveyance roller unit 80A, the first rotation cam 61 rotates counterclockwise. When the rotation angle reaches 45 °, the first exposure pressure roller 82 is brought into the pressure bonding position. The photographic paper 2 is pressed against the first exposure driving roller 81 to be nipped and conveyed. Similarly, the second rotating cam body 62 also rotates. However, since the diameter of the second rotating cam body 62 does not change in this rotation angle range, the second cam follower 64 and, consequently, the second exposure pressure roller 84 is displaced. It remains in the crimping position. However, the intermediate conveyance roller unit 80C is brought into the pressure released state after the role of conveyance of the photographic paper 2 is finished (see FIG. 7).

  Further, when the first and second rotary cam bodies 61 and 62 rotate and the rotation angle reaches 90 °, the second exposure pressure roller 84 is displaced to the complete pressure release position, and the first exposure conveyance roller unit 80A. In preparation for transporting photographic paper from the first to the second exposure transport roller unit. Since the diameter of the first rotating cam body 61 does not change in this rotation angle range, the first exposure pressure-bonding roller 82 is not displaced and remains in the pressure-bonded position, and the photographic paper 2 is transported by the first exposure transport roller unit 80A. Then, exposure is performed by the exposure head 5a (see FIG. 8).

  When the leading edge of the photographic paper 2 enters the second exposure conveyance roller unit 80B, the first and second rotating cam bodies 61 and 62 further rotate in order to displace the second exposure pressure roller 84 in the pressure bonding position direction. As is apparent from FIG. 12, the diameter of the second rotating cam body 62 is gradually decreased from the rotation angle range of 90 ° to 250 °, and the second exposure pressure roller 84 is gently moved to the photographic paper 2. And the first exposure / conveyance roller unit 80A does not cause a sudden load fluctuation on the photographic paper 2 being exposed / conveyed. Since the diameter of the first rotating cam body 61 does not change from the rotation angle range of 90 ° to 250 °, the first exposure pressure-bonding roller 82 is not displaced and remains in the pressure-bonding position (see FIG. 9).

When the rotation angle of the first and second rotating cam 61, 62 reaches 250 °, although the second exposure crimping roller 84 becomes crimped position, followed first exposure pressing rollers 82 is displaced in the infinitesimal pinch release position (See FIG. 10). And the infinitesimal pinch release position, unlike full pinch release position, in which the distance of about several millimeters of 10 minutes between the first exposure driving roller 81, fully releasing the printing sheet 2 in the exposure The purpose is to avoid uneven exposure caused by. As shown in FIG. 11, but the displacement is rotation angle to the infinitesimal pinch release position to achieve at about 290 °, assembly accuracy and precision of each component of the printing paper transport apparatus 80 and the exposure head 8a or changes over time, the position of the optimal differ, the rotational angular position to achieve a fine small pinch release position is preferably adjusted periodically or non-periodically.

To simplify the task of adjusting the rotation angle position to realize this infinitesimal pinch release position, the printer processor of this embodiment, by a cam control means 70 is a cam operated built by software and hardware in the controller 7 the cam controller 71 to provide a control signal to use the pulse motor 67 includes a LUT (look up table) 72 for producing a rotation angle of desired rotation the cam body, this LUT 72, advance a plurality of release infinitesimal crimping Control values corresponding to rotation angles α1, α2, α3 (see FIG. 12) for creating positions are stored. Adjustment During working, to prepare a sequentially test print for each of the plurality of infinitesimal pinch release position, the most optimum value infinitesimal pinch release position produced a small test print of exposure unevenness is used for the subsequent exposure transport.

  In the description of the operation of the first and second rotating cam bodies 61 and 62 so far, the first and second rotating cam bodies 61 and 62 are integrally rotated. However, as described above, the cam operation pulse motor Since the first rotating cam body 61 can be rotated reversely by at least about 350 ° while the second rotating cam body 62 is stopped by reversing 67, the first exposure pressing roller 82 and the second exposure pressing roller The variation of 84 displacement positions can be increased. Further, when it is not necessary to relatively rotate the first and second rotating cam bodies 61 and 62, the first rotating cam body 61 and the second rotating cam body 62 may be integrally formed.

  In the above embodiment, the photographic paper transport device capable of two-row exposure is taken as an example. However, the photographic paper transport device according to the present invention is not limited to this form, and the photographic paper transport device for single-row exposure. Alternatively, it can also be configured as a photographic paper transport device having three or more rows.

Schematic block diagram of a printer processor equipped with a photographic paper transport device according to the present invention. Explanatory drawing explaining a photographic paper conveyance line Side view of photographic paper transport device Partial sectional front view of photographic paper transport device Schematic perspective view of photographic paper transport device Schematic diagram illustrating changes in rotation angle of the first and second rotating cam bodies and changes in displacement of the first and second exposure pressure-bonding rollers. Schematic diagram illustrating changes in rotation angle of the first and second rotating cam bodies and changes in displacement of the first and second exposure pressure-bonding rollers. Schematic diagram illustrating changes in rotation angle of the first and second rotating cam bodies and changes in displacement of the first and second exposure pressure-bonding rollers. Schematic diagram illustrating changes in rotation angle of the first and second rotating cam bodies and changes in displacement of the first and second exposure pressure-bonding rollers. Schematic diagram illustrating changes in rotation angle of the first and second rotating cam bodies and changes in displacement of the first and second exposure pressure-bonding rollers. Schematic diagram illustrating changes in rotation angle of the first and second rotating cam bodies and changes in displacement of the first and second exposure pressure-bonding rollers. Rotation angle chart

Explanation of symbols

2 photographic paper 5 digital print unit 5a exposure head 6 development processing unit 7 controller 8 photographic paper transport device 8A photographic paper supply line 8B exposure transport line 8C development transport line 60 cam mechanism 61 first rotating cam body 62 second rotating cam body 63 First cam follower 64 Second cam follower 65 Support shaft 67 Pulse motor 70 for cam operation Cam control means 71 Cam control unit 72 LUT
80A First exposure conveyance roller unit 80B Second exposure conveyance roller unit 80C Intermediate conveyance roller unit 81 First exposure drive roller 82 First exposure pressure roller 83 Second exposure drive roller 84 Second exposure pressure roller

Claims (2)

A first exposure including a first exposure driving roller and a first exposure pressure roller disposed on the upstream side of the exposure head in the conveyance direction for pressure-conveying the photographic paper during exposure of the photographic paper by an exposure head that exposes an image on the photographic paper. A second exposure transport roller unit including a transport roller unit, and a second exposure driving roller and a second exposure press roller disposed on the downstream side of the exposure head for pressure transporting the photographic paper during exposure of the photographic paper; In a photographic paper transport device comprising:
The first exposure pressure roller is displaceable in a perspective direction with respect to the first exposure drive roller, the second exposure pressure roller is displaceable in a perspective direction with respect to the second exposure drive roller, and A cam mechanism including a first rotating cam body for determining a displacement position of the first exposure pressure roller, and the first rotation for determining a speed at which the first exposure pressure roller is displaced in a perspective direction with respect to the first exposure driving roller. And a cam control means for controlling a momentary rotation angle of the cam body, and an inclined surface for displacing the first exposure pressure-bonding roller from a pressure-bonding position to a minute pressure-bonding release position is formed on the first rotating cam body. The cam control means stores a control value corresponding to a rotation angle of the first rotating cam body that creates a plurality of different micro-compression release positions, and an optimum micro-pressure selected from the plurality of rotation angles. The first exposure pressing rollers to displacement of the said optimal micro pinch release position from the crimping position by controlling the rotation angle of momentary said first rotary cam member which is determined based on the rotation angle to create a wear release position A photographic paper conveying apparatus characterized in that a speed is determined. It said cam mechanism includes a second rotary cam member for determining the displacement of the second exposure pressing rollers, so that the second exposure pressing rollers gradually slows the rate of displacement of the crimping position in the second rotary cam member 2. The photographic paper conveying apparatus according to claim 1, wherein an inclined surface is formed on the photographic paper.

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