JP2007003803A - Photographic printing system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To constitute a photographic printing system which ensures easy cleaning of a developing and transport path of a photosensitive material. <P>SOLUTION: A transport roller R pair of a relay transport unit for feeding printing paper P to a developing and transport mechanism C of a developing section from an exposure section is freely openably and closably constituted, and an opening and closing door section 10Z is disposed in an area near the transport roller R pair of the relay transport unit included in the casing 10 of a printing block. A controller for controlling the exposure section and the development section executes the processing in a cleaning mode for driving the developing and transport mechanism C in the state of stopping processing in the exposure section. In the cleaning mode, the cleaning in the form of feeding a cleaning sheet S to the developing and transport mechanism C by opening the opening and closing door section 10Z and opening the transport roller R pair is realized. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a developing and conveying mechanism having a plurality of pressure-type conveying rollers so as to perform development processing by introducing a photosensitive material exposed in an exposure unit into a developing unit in which a developing solution is stored. More particularly, the present invention relates to a technique for cleaning a conveyance path of the photosensitive material.

  As techniques related to the photographic printing apparatus configured as described above, there are those described in Patent Document 1 and Patent Document 2. That is, in Patent Document 1, the elapsed time is counted after the development processing of the photosensitive material, and when the predetermined time has not elapsed since the development processing is completed, the transport mechanism is cleaned and the development processing is completed. When the predetermined time has elapsed, cleaning of the transport mechanism is performed by sending cleaning printing paper pulled out from the paper magazine to the transport mechanism.

  Patent Document 2 describes a cleaning tape that is sent to clean a negative film conveyance path in a photographic printing apparatus. This cleaning tape has a structure in which a porous screen having a knitted fabric is superposed on an adhesive surface formed on a sheet body, and the cleaning tape negative film is fed into a conveyance path from an intermediate insertion port for feeding the path to the path. As a result, the adhesive surface is exposed from the mesh portion of the porous screen by the action of pressure from the transport roller in the transport mechanism, and the transport roller is cleaned.

JP 2002-351535 A (paragraph numbers [0021] to [0028], FIGS. 2 to 4) JP-A-11-202463 (paragraph numbers [0013] to [0026], FIGS. 1 to 7)

  In the developing unit of the photographic printing apparatus, a large number of conveying rollers are arranged in a path for conveying the photosensitive material, and most of the conveying rollers are arranged in the developing processing liquid in the developing processing tank. In the development processing tank having such a structure, dust brought in on the photographic paper may adhere to the conveyance roller, or a substance generated by a chemical reaction with the development processing liquid may adhere to the conveyance roller. It was. In addition, the transport roller existing on the surface of the developing solution causes the water in the developing solution to evaporate over time after the developing solution from the photosensitive material adheres, and the chemical contained in the developing solution crystallizes. There was also. The deposit on the transport roller thus created is removed to some extent by continuously transporting the photosensitive material to the transport mechanism.

  However, even if the photosensitive material is continuously conveyed, the contamination of the conveyance roller cannot be completely removed. When the photosensitive material is conveyed by the dirty conveyance roller, the contamination of the conveyance roller is transferred to the photosensitive material. Sometimes the surface was soiled.

  This kind of inconvenience is improved by using the technique shown in Patent Document 1 or using the technique shown in Patent Document 2. However, in the case of cleaning the transport roller by transporting the photosensitive material as in Patent Document 1, the width of cleaning is not limited to the width of the photosensitive material, but there is room for improvement in that the photosensitive material is wasted. was there. Further, in Patent Document 2, since a member dedicated for cleaning is used, the photosensitive material is not wasted as in Patent Document 1, and cleaning can be performed with a required width, and cleaning is performed better than when the photosensitive material is conveyed. However, since it is necessary to control the conveyance mechanism to convey the cleaning-dedicated member to the conveyance mechanism at the timing when development processing is not performed, the processing of the photosensitive material is completely completed, and the situation where the next development processing is not performed has been created. It was necessary to create an environment for cleaning, such as the need to transport a member dedicated for cleaning at the timing, which was time-consuming.

  Incidentally, in a conventional photographic printing apparatus, with the photographic printing apparatus stopped, a rack or the like equipped with a conveyance roller is taken out from the development processing tank, and the contamination of the conveyance roller is removed by an artificial water washing operation using a brush. It took a lot of time and effort.

  An object of the present invention is to rationally constitute a photographic printing apparatus capable of easily cleaning a photosensitive material conveyance path.

A feature of the present invention is that a developing and conveying mechanism having a plurality of pressure-bonding type conveying rollers so as to introduce a photosensitive material exposed in an exposing unit into a developing unit in which a developing solution is stored and perform a developing process, In a photographic printing apparatus provided with a control means for controlling the development transport mechanism,
Forming a sheet insertion section for feeding a cleaning sheet to a position upstream of the developing section in the transport direction of the developing transport mechanism;
The control unit includes a cleaning mode in which the cleaning sheet inserted in the sheet insertion unit is allowed to pass through the developing unit by driving the development transport mechanism in a state where the exposure processing in the exposure unit is stopped. In the point.

  With this configuration, the exposure process in the exposure unit can be stopped simply by selecting the cleaning mode, and the cleaning sheet is fed from the sheet insertion unit, without performing an operation to artificially create a situation for stopping the exposure process in the exposure unit. It becomes possible. Then, by feeding the cleaning sheet from the sheet insertion portion, cleaning can be performed in a form in which the cleaning sheet is conveyed. It is also possible to use a cleaning sheet having a width slightly wider than the maximum width of the photosensitive material transported by the developing transport mechanism. By using such a cleaning sheet, crystals formed on the transport roller and dirt can be removed. Removal can be performed reliably. In addition, crystals and dirt can be reliably removed by using a cleaning sheet made of a material that can remove dirt more efficiently than photosensitive materials such as photographic paper. As a result, it is possible to easily create an environment for cleaning, and to remove the contamination of the photosensitive material during the development process by removing dirt such as a conveyance roller and a guide by a cleaning sheet.

  In the present invention, the exposure unit is configured to perform exposure in such a manner that the long photosensitive material housed in a magazine is pulled out and supplied to an exposure position, and the control means includes the cleaning mode When the process in (2) is selected, an operation may be performed in which the extracted photosensitive material is stored in the magazine.

  With this configuration, when processing in the cleaning mode is selected, the photosensitive material pulled out from the magazine is stored in the magazine, and thereafter, for example, the photosensitive material is inserted to insert a cleaning sheet. Even if the conveyance path is exposed, it is possible to avoid the disadvantage that the photosensitive material is exposed by the light beam from the exposed portion.

  In the present invention, the exposure unit and the developing unit are housed in a dark box-structured housing, and the sheet insertion unit is formed at an intermediate position between the exposure unit and the developing unit. Of these, a door portion that allows insertion of the cleaning sheet may be formed by opening a position near the sheet insertion portion.

  With this configuration, the door is opened, and the cleaning sheet is inserted into the intermediate developing and conveying mechanism between the exposure unit and the developing unit, so that the cleaning sheet is fed into the developing unit, and the developing unit conveying rollers, etc. Can be cleaned.

  The present invention includes a relay transport unit that transports the photosensitive material at an intermediate position between the exposure unit and the developing unit, and a pair of rollers constituting the transport roller included in the relay transport unit presses the photosensitive material. The cleaning sheet is configured to be switchable between a press-bonding position and an open position in which the respective transport rollers are separated from each other, and an opening space formed by setting the transport roller pair at the open position allows the cleaning sheet with respect to the developing transport mechanism to be You may allow insertion.

  With this configuration, the roller pair constituting the conveyance roller of the relay conveyance unit at the intermediate position between the exposure unit and the development unit is set to the open position, and the cleaning sheet is inserted from the open space formed by switching to the open position. Then, it can be sent to the developing conveyance mechanism of the developing unit and cleaned.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[Overall Configuration] As shown in FIG. 1, an operating block that converts a frame image of a developed photographic film F into a digital signal, processes the converted image data, and performs basic control of the entire system. A photographic print referred to as a digital minilab with a print block B which is provided with A, and which is subjected to exposure processing and development processing for silver salt type photographic paper P as a photosensitive material, and which is sent out after drying processing The device is configured.

[Operate Block] The operate block A is a film scanner 2 that takes a frame image of the photographic film F as a digital signal by photoelectric conversion to the console 1 and captures it as image data, a display 3 that displays various information, image processing, An image processing apparatus 4 composed of a general-purpose computer that performs various processes necessary for printing is arranged. On the upper surface of the console 1, a keyboard 5 for inputting information to the image processing device 4 and a mouse 6 functioning as a pointing device are provided.

  Each of the image processing apparatuses 4 acquires image data from a disk-type medium such as a CD, MO, or FD, or obtains image data from a semiconductor-type medium (not shown). The media drive 7 corresponding to the structure is provided. The image processing apparatus 4 includes an interface that realizes not only image processing such as color correction and contrast correction but also processing related to printing by operating the keyboard 5 and mouse 6 according to the display on the display 3. ing.

  The film scanner 2 has a light source section having a light emitting diode, a halogen lamp, etc. in the lower part, a zoom lens in the middle part, and frame images from the zoom lens in the upper part as R (red) and G (green). , B (blue), a line CCD type photoelectric conversion unit that separates and captures the three primary colors. In this film scanner 2, when scanning the photographic film F, the film carrier 2A suitable for the size of the photographic film F is mounted on the upper surface of the light source unit, and scanning is started, whereby the photographic film F is scanned in the sub-scanning direction. In synchronization with the operation of conveying in the (longitudinal direction), the photoelectric conversion unit performs processing to capture the frame image of the photographic film F as a digital signal along the main scanning direction, and the captured image data is the image processing device 4. Transferred to and saved.

[Print Block] As shown in FIGS. 1 and 2, the print block B includes an exposure unit Ex, a development unit De, and a drying unit Dr, which are housed in a dark box-shaped casing 10 and are subjected to a drying process. After that, the photographic paper P sent out from the discharge unit 11 at the upper part of the casing 10 is sent in the horizontal direction by the transport belt 12, and the photographic paper P is sorted and collected on the tray 13 </ b> A of the sorter 13 in order units.

  In the exposure unit Ex, two photographic paper magazines M and M (an example of a magazine) are arranged at the lower part, an exposure head H is arranged at the upper position, and a controller 15 as control means is arranged in the vicinity of the exposure head H. is doing. In the exposure unit Ex, the photographic paper P from the photographic paper magazines M, M is supplied from the supply transport unit UF to the exposure transport unit UE for exposure, and the photographic paper P from the exposure transport unit UE is relayed to the relay transport unit UD. A conveying path for the photographic paper P is formed so as to be fed to the developing unit De via the.

  The supply and transport unit UF pulls out a long color photographic paper P accommodated in a roll form in the photographic paper magazine M with a press-advanced advance roller 16, cuts it into a print size with a cutter 17, and the cut photographic paper Information such as color correction information is printed by the print head 18 on the back side of P, and then delivered to the exposure transport unit UE by the pressure-conveying transport body 19 that sandwiches and transports the photographic paper P.

  The exposure transport unit UE receives the photographic paper P from the pressure-conveying transport body 19 by a receiving roller 20 and presses the photographic paper P with a pair of driving rollers 21 and a pair of driven rollers 22 corresponding thereto. Then, it is conveyed upward (in the sub-scanning direction). When the photographic paper P reaches the exposure position X by this conveyance, exposure is performed along the main scanning direction with the laser beam from the exposure head H.

  The relay conveyance unit UD includes a front conveyance mechanism U1 having a plurality of pressure rollers 23 (an example of a conveyance roller), a distribution mechanism U2 that distributes the photographic paper P into two distribution paths by a pair of chuckers 24, and photographic paper. And a delivery conveyance mechanism U3 for delivering P to the developing unit De.

  Although not shown in the drawings, the supply and transport unit UF includes an electric motor that feeds and rewinds the photographic paper P accommodated in the photographic paper magazines M and M, and includes the advance roller 16, the cutter 17, An electric motor is provided for driving each of the crimping carriers 19. The exposure transport unit UE includes an electric motor that drives a plurality of rollers, and the relay transport unit UD includes an electric motor that drives the plurality of rollers and an electric motor that drives the chucker 24. . These electric motors are controlled by the controller 15.

  The front transport mechanism U1 has a function of transporting the photographic paper P in a pressure-bonded state by driving rotation of a plurality of pressure rollers 23, and the pair of chuckers 24 operates to clamp (chuck) the photographic paper P; In addition to performing an operation of releasing the nip of the photographic paper P, the chucker 24 can be moved in a direction along the conveyance direction of the photographic paper P and in a direction orthogonal to the operation direction.

  The delivery / conveyance mechanism U3 is also configured to function as the sheet insertion portion Z of the present invention. That is, as shown in FIG. 3, the delivery / conveyance mechanism U3 includes a conveyance roller R (conveyance roller pair) composed of an introduction roller 25 and a pair of driven rollers 26 arranged on the reception side, and also receives the photographic paper received. Lower and upper guide plates 27 and 28 for guiding P obliquely downward, and three drives arranged on the lower guide plate 27 side so as to convey the photographic paper P along the guide plates 27 and 28 A roller 29 and three driven rollers 30 disposed on the upper guide plate 28 facing the roller 29 are provided.

  The three driving rollers 29 and the corresponding three driven rollers 30 constitute a plurality of conveying rollers R (conveying roller pairs). Although not shown in the drawing, a transmission system is formed to transmit the driving force from the electric motor to the introduction roller 25 and the three driving rollers 29.

  The upper guide plate 28 includes a movable plate 28A corresponding to two upstream driven rollers 30 and a fixed plate 28B corresponding to one driven roller 30 at the lower end position. The upper guide plate 28 is fixed to the movable plate 28A. The plate 28B is slidably coupled around a support shaft 31 in a lateral orientation, and the two upstream driven rollers 30 are supported on the movable plate 28A in a free-wheeling manner, and the lower end of the fixed plate 28B is supported at the lower end. The driven roller 30 is idled. Further, the three driving rollers 29 are supported by a frame integrally formed with the lower guide plate 27.

  In the delivery / conveying mechanism U3, the movable plate 28A is set in the closed position shown in FIG. 3 so that the driving roller 29 and the driven roller 30 are brought into a pressure-bonding position, and the movable plate 28A is opened as shown in FIG. By setting to, the open position where the driving roller 29 and the driven roller 30 are separated is reached.

  Due to such a configuration, in the relay transport unit UD, the transport direction is changed to the horizontal direction by transporting the photographic paper P sent upward from the exposure transport unit UE by the plurality of pressure rollers 23 of the front transport mechanism U1. Then, it is delivered to the sorting mechanism U2. In the sorting mechanism U2, a relatively small sized photographic paper P is sandwiched between the chuckers 24, and is set in advance and distributed to the two sorting paths, and the large sized photographic paper P is fed in the width direction. Both ends are sandwiched at the same time by a pair of chuckers 24 and sent out without sorting. The delivery / conveyance mechanism U3 starts conveying the photographic paper P delivered from the chucker 24 of the distribution mechanism U2 with the introduction roller 25 and the driven roller 26, and the photographic paper P is guided to the guide plate 27, In a state of being guided between the two, the three driving rollers 29 and the corresponding driven rollers 30 are sequentially pressed and conveyed, and transferred to the pressure-receiving-type receiving roller 35 (an example of the conveying roller R) of the developing unit De.

  The developing unit De includes a development processing tank 36 in which a plurality of processing tanks including a color developing tank, a bleach-fixing tank, and a stabilization tank are integrally formed. Each processing tank stores a developing solution for developing the photographic paper P, and has a transport rack 38 having a plurality of pressure rollers 37 (an example of the transport roller R) for transporting the photographic paper P. In addition, an overhead rack 40 having a plurality of pressure rollers 39 (an example of the transport roller R) is provided so that the photographic paper P fed to the upper part of each transport rack 38 is transferred to the next transport rack 38.

  The transport rack 38 provided with the plurality of pressure rollers 37 and the overhead rack 40 provided with the plurality of pressure rollers 39 constitute the developing transport mechanism C of the present invention. Although not shown in the drawings, the pressure rollers 37 and 39 provided in the transport rack 38 and the pressure rollers 37 and 39 provided in the overhead rack 40 are driven synchronously by an electric motor.

  The drying section Dr performs drying by supplying dry air from the blower 45 to the photographic printing paper P sent out from the developing section De.

  The photographic printing apparatus of the present invention feeds the cleaning sheet S shown in FIGS. 5 and 6 from the sheet insertion portion Z at an intermediate position between the exposure portion E and the development portion De to the development portion De, thereby the sheet insertion portion Z. As a reference, the plurality of transport rollers R provided in the developing transport mechanism C on the downstream side can be cleaned.

  The cleaning sheet S has a width W that is slightly wider than the width of the photographic paper P that can be processed in the print block B, and a length L that is set to a value sufficient to stably convey the cleaning sheet S. T is set to a value slightly thicker than the photographic paper P. This cleaning sheet is made of a resin that is flexible and has excellent water resistance, and has a shape in which a large number of concave portions Sa and convex portions Sb are continuously formed on both sides. By feeding the cleaning sheet into the transport path of the developing portion De, a transport roller When a large number of convex portions Sb come into contact with each other, the crystallized product and dirt are removed so as to be wiped off.

  The cleaning sheet S has a performance that allows the surface to be cleaned and reused by washing with water after use. Further, the cleaning sheet S may be formed with only a large number of concave portions or a large number of convex portions, and adheres like that described in JP-A-11-202463 (Patent Document 2). You may use the thing of a property and what contains a fine abrasive | polishing agent on the surface.

  As shown in FIG. 1, a plurality of doors 10 </ b> A for opening the exposure unit Ex, the developing unit De, and the drying unit Dr are provided on the side surface of the casing 10 of the print block B so as to be openable and closable. On the upper surface, an opening / closing door portion 10Z (an example of a door portion) that is opened / closed via a hinge 50 is formed at an upper position of the delivery / conveyance mechanism U3 constituting the relay / conveyance unit UD.

  The controller 15 of the print block B includes a microprocessor, and controls the conveyance of the photographic paper P in the exposure unit Ex and the exposure in the exposure head H, and controls the conveyance of the photographic paper P in the developing unit De. To do. The image processing device 4 of the operating block A realizes the printing process by transmitting the image data to be printed and the order data to the controller 15.

[Control Form] The controller 15 executes a conveyance routine shown in the flowchart of FIG. That is, when the power is turned on and the print block B is operated, the normal transport mode is set after initialization (steps # 01 and # 02).

  In this normal transport mode, the supply transport unit UF, the exposure transport unit UE, and the relay transport unit UD transport the photographic paper P at the speed set in the developing unit De in correspondence with the printing process. Control is performed so that the photographic paper P is transported at a set speed in the drying unit Dr, and sent out from the discharge unit 11. Further, when the photographic paper P is clogged in the conveyance system during conveyance in the normal conveyance mode, the conveyance is stopped, and information indicating that the clogging has occurred is transmitted to the image processing device 4 to display the display. The information on the clogging in 3 is displayed.

  Next, when the cleaning mode is selected by operating the keyboard 5 or the mouse 6 of the operating block A, this information is transmitted to the controller 15, and the controller 15 performs exposure of the photographic paper P during the exposure process. After completion, the exposed photographic paper P is sent out and development processing is performed. The photographic paper P drawn from the photographic paper magazine M is rewound onto the photographic paper magazine M, and the conveyance between the developing unit De and the drying unit Dr is continued. (Steps # 03 and # 04).

  In step # 04, a signal for determining that the photographic paper P has been rewound from the photographic paper magazine M and a signal for confirming that the exposed photographic paper P has been sent to the developing unit De are obtained. When the processing system is configured and these signals are acquired, information indicating that cleaning is possible is transmitted to the operating block A and displayed on the display 3 (step # 05).

  When the operator confirms that the state of step # 05 has been reached, as shown in FIG. 4, the door 10Z is artificially opened and the movable plate 28A is artificially opened to drive the drive roller. A roller pair composed of 29 and a driven roller 30 is set at an open position. In this cleaning mode, since the transport between the developing unit De and the drying unit Dr is continued, the operator inserts the cleaning sheet S from the sheet insertion unit Z that is created as an open space by opening the roller pair. The sheet S is drawn into the delivery / conveying mechanism U3 and further fed into the receiving roller 35.

  The cleaning sheet S thus sent to the receiving roller 35 is conveyed in a form that passes through the plurality of pressure rollers 37 of the conveyance rack 38 and the plurality of pressure rollers 39 of the overhead rack 40. It removes so that a crystallized substance and dirt may be wiped in contact with rollers 37 and 39.

  In this control mode, after the cleaning mode is selected, the developing and conveying mechanism C is continuously operated. However, the operator operates the keyboard 5 and the like after inserting the cleaning sheet S from the sheet inserting portion Z. The control mode may be set so that the delivery conveyance mechanism U3 and the development conveyance mechanism C start operation and the conveyance of the cleaning sheet S is started.

  Thus, after the cleaning sheet S is sent to the developing unit De and the cleaning sheet S discharged from the discharge unit 11 is collected, information indicating that the cleaning is completed by operating the keyboard 5 or the mouse 6 of the operating block A is displayed. By inputting, the process in the cleaning mode is finished, and the conveyance in the normal conveyance mode becomes possible (Step # 06). Then, by inputting information for ending the transfer routine, the transfer routine ends (step # 07).

  As described above, in the photographic printing apparatus of the present invention, even when the opening / closing door 10Z is opened after the cleaning mode is selected, there is no inconvenience that fog occurs on the photographic paper P inside the exposure unit Ex. Further, by opening the movable plate 28A of the delivery conveyance mechanism U3, the cleaning sheet S is allowed to be directly inserted into the conveyance path of the photographic paper P with the sheet insertion portion Z being largely opened. Can be easily inserted to clean the transport roller R.

[Another embodiment]
The present invention may be configured as follows in addition to the embodiment described above.

(A) The present invention may be applied to a photographic printing apparatus that performs from reception processing to printing processing by a single control device, or to a photographic printing device that includes three or more control devices. As described above, in the case of having three or more control devices, the control for cleaning is executed in cooperation with each other.

(B) At the time of cleaning, a driving roller for assisting the feeding of the cleaning sheet to be inserted into the sheet insertion portion is attached. Thus, by providing the driving roller only at the time of cleaning, even a long cleaning sheet can be smoothly fed.

  After executing a predetermined amount of development processing, the processing mode is set so as to automatically switch to the cleaning mode. Thus, it is possible for the operator to recognize that cleaning is necessary and to remove the stain on the developing transport mechanism.

Perspective view of photo printing device Print block vertical front view Sectional drawing which shows the conveyance structure of the site | part of a delivery conveyance mechanism Sectional drawing which shows the state of the delivery conveyance mechanism at the time of inserting a cleaning sheet Perspective view of cleaning sheet Enlarged sectional view of the cleaning sheet Flow chart of transfer routine

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Housing | casing 10Z Door part: Opening / closing door part 15 Control means: Controller C Development conveyance mechanism M Magazine P Photosensitive material: Photographic paper R Conveyance roller S Cleaning sheet Z Sheet insertion part Ex Exposure part De Development part UD Relay conveyance unit X Exposure position

Claims (4)

A developing and conveying mechanism having a plurality of pressure-bonding type conveying rollers so as to introduce the photosensitive material exposed in the exposure unit into the developing unit in which the developing solution is stored and perform the developing process, and to control the developing and conveying mechanism A photographic printing apparatus comprising a control means,
Forming a sheet insertion section for feeding a cleaning sheet to the upstream position of the developing section in the transport direction of the developing transport mechanism;
The control unit includes a cleaning mode in which the cleaning sheet inserted in the sheet insertion unit is allowed to pass through the developing unit by driving the development transport mechanism in a state where the exposure processing in the exposure unit is stopped. Photo printing device.   The exposure unit is configured to perform exposure in a form in which the long photosensitive material housed in a magazine is pulled out and supplied to an exposure position, and the control unit performs processing in the cleaning mode. 2. The photographic printing apparatus according to claim 1, wherein when the selection is made, an operation for accommodating the drawn photosensitive material in the magazine is performed.   The exposure unit and the development unit are housed in a dark box-structured housing, and the sheet insertion unit is formed at an intermediate position between the exposure unit and the development unit. The photographic printing apparatus according to claim 1, wherein a door portion that opens a position near the portion and allows the cleaning sheet to be inserted is formed.   A relay transport unit that transports the photosensitive material at an intermediate position between the exposure unit and the developing unit, and a pair of rollers constituting the transport roller provided in the relay transport unit; The cleaning sheet is configured to be switchable to an open position in which the respective transport rollers are separated from each other, and allows the cleaning sheet to be inserted into the developing transport mechanism from an open space formed by setting the pair of transport rollers at the open position. Item 4. The photographic printing apparatus according to item 3.

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