JPH0731358B2 - Photo printing equipment - Google Patents

Description

The present invention relates to a photographic printing apparatus for printing an image from a negative film onto photographic paper.

[Background technology]

In a photographic printing apparatus, an image of a negative film is formed on photographic paper by printing light from a light source.

In this case, the photographic printing paper is often a roll-shaped printing paper on which a large number of images can be printed, and the printing work is carried out by sequentially feeding the roll-shaped printing paper from its tip to the printing position. There is.

However, when the leading edge of the photographic paper is fed to the printing position, it interferes with the mask member that is located at the printing position and defines the printing range of the photographic paper, which may cause conveyance failure. For this reason, conventionally, when the leading edge of the printing paper is fed, the leading edge of the printing paper is manually guided or a special guide member is used (see Japanese Patent Publication No. 52-36410). Therefore, the printing work is complicated and the structure of the guide means is complicated.

In consideration of the above facts, the present invention uses a mask for determining the printing range of the printing paper at the time of printing as a guiding means at the time of feeding the leading end of the printing paper without feeding any special guide means. The purpose is to obtain a photographic printing apparatus that can be used.

[Outline and operation of the invention] A photographic printing apparatus according to the present application is provided with a mounting base on which photographic paper is mounted when printing onto photographic paper, and is arranged on both sides of the optical axis of the photographic printing paper to advance and retreat along the photographic paper transport direction. The printing range is determined by changing the interval between them and at the same time the paper leading edge is advanced and retracted so that the leading edge of the printing paper does not get caught when feeding the leading edge of the printing paper and the gaps between them are eliminated so that the leading edges are aligned with each other. Of the lengthwise mask, and a flexible base end portion of which is formed following the tip end portion of the lengthwise mask and is wound up in layers, and the lengthwise mask is fed when the tip end portion of the printing paper is fed. A pair of mask bodies that prevent the printing paper from rising when the leading edge of the photographic paper is fed by providing a photographic paper transport space between the leading edge of the mask and the mounting base; Optical axis printed on photographic paper between mask And a pair of width-direction masks that are arranged on both sides of the width direction and that move back and forth in the direction perpendicular to the photographic paper conveyance direction to change the distance between them to determine the printing range, and at the end of the pair of width-direction masks facing the mounting table. And a notch formed along the width of the photographic paper and receiving both ends in the width direction of the printing paper.

Therefore, according to the present invention, when the leading edge of the photographic paper is fed, the pair of lengthwise masks are moved forward and backward so as to prevent the leading edge of the photographic paper from being caught, thereby eliminating the gap between them. It is in a matched state. Further, the mask body which is flexible and whose base end is wound up in layers forms a transfer space for the photographic paper between the leading end of the lengthwise mask and the mounting table when the leading end of the photographic paper is fed. It is provided to prevent the printing paper from floating when the leading edge of the printing paper is fed.

Therefore, the pair of lengthwise masks appropriately holds the leading edge of the printing paper between the leading end of the printing paper and the mounting table when the leading edge of the printing paper is fed, and the leading edge of the printing paper is conveyed by sandwiching the middle portion of the printing paper. Even when the paper is fed with the rigidity, the leading end of the printing paper can be reliably guided.

Further, since the mask body formed subsequent to the tip portion of the lengthwise mask has flexibility and is wound in layers, even if the printing apparatus has a large area as a printing range, the entire apparatus can be used. It is possible to reliably guide the photographic paper at the time of feeding the leading edge of the photographic paper as described above with a compact structure without making the size large.

Further, a pair of widthwise masks arranged between the mounting table and the pair of lengthwise masks have cutouts facing the mounting table for receiving both ends in the width direction of the printing paper, respectively along the ends thereof. I have it. Therefore, the notch portion guides both ends of the photographic paper in the width direction between the pedestal and the mounting table, and prevents the both ends of the photographic paper in the width direction from rising when the leading end of the photographic paper is fed and prevents meandering. As a result, the printing paper can be transported more reliably.

That is, the pair of lengthwise masks and the pair of widthwise masks also serve as a guide unit for the leading end portion of the printing paper.

Further, this widthwise mask can be applied to obtain an image having a portion which is not printed around the photographic paper, that is, having an edge, and the widthwise mask is moved by a slight amount to select an image with a border and an image without a border. can do. In the case of this framed image, it is of course necessary to move the lengthwise mask together with this by a slight amount.

[Embodiment of the Invention] FIG. 1 shows an overall view of a photographic printing paper conveying system of a photographic printing apparatus to which the present invention is applied. The photographic printing paper 12 accommodated in the photographic printing paper accommodating section 10 is a photographic printing section 14. Image is exposed to
It is configured to be sent to the developing unit 18 via the transport processing unit 16.

(Description of Printing Paper Housing 10) In this printing paper housing 10, the unexposed printing paper 12 is housed in the box 20 while being rolled, and set on the machine base 22. When the delivery knob 21 attached to the box 20 is engaged and rotated, the leading end of the photographic paper 12 passes through the drawer 24.

The machine base 22 is provided with a sensor 26 for detecting the leading end of the photographic printing paper 12 and nipping and conveying rollers 28, 30.
The nipping / conveying roller 28 is designed to be rotatable by receiving the driving force of the motor 32, and the nipping / conveying roller 30 is connected to the sensor 26
When the leading edge of the photographic paper 12 is detected by the solenoid 34, the leading edge of the photographic paper 12 can be nipped by approaching the nip transport roller 30 by driving the solenoid 34.

The nipping / conveying rollers 36, 3 are provided downstream of the nipping / conveying rollers 28, 30.
7 and 38 are provided so that the leading end of the photographic printing paper 12 sent out from the nipping and conveying rollers 28 and 30 is nipped and sent to the photographic printing section 14. The nip transport roller 36 is a motor 40
It is configured to rotate by receiving the driving force of.

The nipping and conveying rollers 37, 38 are swingably supported via a bracket 39B to the other end of an arm 39 whose one end is pivotally supported by a shaft 39A on the machine base 22, and the arm 39 is a tension coil between the arm 39 and the machine base 22. Spring
41 are stretched. Therefore, the nipping and conveying rollers 37, 38 have an urging force that is pressed against the nipping and conveying roller 36.

A guide plate 42 is provided between the nipping / conveying rollers 28, 30 and the nipping / conveying rollers 36, 37 so as to be rotatable around the nipping / conveying roller 28 by a predetermined angle. The guide plate 42 can be rotated by the driving force of the motor 44 from a state along the conveying path of the photographic paper 12 as shown in FIG. 1 to a state of retracting from the conveying path as shown by an imaginary line. This guide plate
42 is provided with a sensor 46 so that when the guide plate 42 reaches the imaginary line state in FIG. 1, it is possible to detect the state where the intermediate portion of the printing paper 12 has a loop as shown by the imaginary line. .

A sensor 48 is provided at the entrance of the photographic printing section 14 so as to face the conveyance path of the photographic paper 12 so that the front end of the photographic paper 12 can be detected.

(Description of Photo Printing Unit 14) The structure of the photo printing unit 14 will be described with reference to FIGS.
In the photo printing unit 14, the photographic printing paper 12 traveling in the frame 60
Is determined by the lengthwise mask heads 62 and 64 and the widthwise mask heads 66 and 68 which form the tip portion of the lengthwise mask, and the printing light from a light source (not shown) is exposed.

The frame 60 is formed in a frame shape whose upper and lower sides are open, and has an insertion opening 70 for the photographic paper 12 at one end and a discharge opening 72 for the photographic paper 12 at the other end. A mounting base 74 is arranged below the track of the printing paper 12 passing through the insertion opening 70 and the discharge opening 72 to form a mounting surface of the printing paper 12. This mount 74
A large number of small openings 76 are formed, and these small openings 76 are communicated with suction means 78 such as a motor arranged inside the small openings 76. For this reason, the photographic printing paper 12 mounted on the mounting table 74 is designed to be attracted to the mounting table 74 through the small opening 76 and become flat during printing.

As shown in FIGS. 3 and 5, the lengthwise mask heads 62 and 64 are thin-walled plate members whose longitudinal direction is perpendicular to the photographic paper conveying direction (arrow A direction).
62 is disposed upstream of the lengthwise mask head 64 in the photographic paper conveying path.

Moving blocks 80 and 82 are attached to both longitudinal ends of the longitudinal mask head 62. The moving block 80 has a guide rod 84 penetrating the frame 60 parallel to the photographic paper conveying direction, and the moving block 82 is a guide rod.
It is mounted via a bifurcated portion 88 to a guide rod 86 that is laid in parallel with 84. Therefore, the moving blocks 80 and 82 are movable along the guide rods 84 and 86, and the lengthwise mask head 62 is linearly moved to the upstream side and the downstream side along the printing paper conveying direction. Even during this movement, the front end of the lengthwise mask head 62 maintains a state perpendicular to the photographic paper conveyance direction.

On the other hand, moving blocks 80A and 82A are also attached to both ends of the lengthwise mask head 64, and are bridged to the guide rod 84A and the guide rod 86, respectively. The guide rod 84A is mounted on the frame 60 in parallel with the guide rod 84. As shown in FIG. 3, the lengthwise mask heads 62 and 64 are attached to the lower ends of the moving blocks 80 and 80A, and the moving blocks 80 and 80A move in different paths on different orbits so that the lengthwise direction is reduced. Mask head 62,
The tips of 64 are movable until they can contact each other on the optical axis L.

A moving block 80, as shown in FIGS.
The intermediate portion of the endless belt 92 is locked to 80A via the brackets 90, 90A. The endless belt 92 is a timing belt having an intermediate portion bridged over pulleys 94, 96, and these pulleys 94, 96 are pivotally supported by brackets 98, 100, respectively. The bracket 98 is connected to the frame 60 on the upstream side in the printing paper conveyance direction, and the bracket 100 is connected to the frame 60 on the downstream side.
It is fixed to each. This allows the endless belt 92
Has a pair of parallel portions between the pulleys 94 and 96, and the moving block 80 is attached to one straight line portion of the parallel portion and the other moving block 80A is attached to the other straight line portion. Therefore, when the endless belt 92 rotates, the moving block
80 and 80A are driven in opposite directions, that is, in directions approaching or moving away from each other around the optical axis A.

The intermediate portion of the endless belt 102 is wound around the pulley 94 adjacent to the winding portion of the endless belt 92. This endless belt 102
Is wound around the output shaft pulley 106 of the motor 104, and the driving force of the motor 104 is transmitted to the endless belt 92. The motor 104 is mainly driven and controlled by the control means 108 using a microcomputer.

As shown in FIGS. 3 and 5, L-shaped metal fittings 110 are attached to the lengthwise mask heads 62 and 64 on the opposite sides of the optical axis L with screws 112, respectively. Between the L-shaped metal fitting 110 and the lengthwise mask heads 62 and 64, one longitudinal ends of mask bodies 114 and 114A made of a flexible material such as cloth are sandwiched and fixed. The middle part of this mask body 114 is
The wrapping rods 116 are laid across the frame 60 on the upstream side and the downstream side of the photographic paper transporting direction, and the longitudinal direction is wound at right angles to the photographic paper transporting direction. Has been.

In addition, the base ends of these mask bodies 114 and 114A are wound bars 1
It is wound in layers on a winding shaft 118 which is hung over the frame 60 in parallel with the winding rod 116 above 16. The winding shaft 118 is constantly biased and rotated by a winding attachment force means 120 such as a mainspring spring in a direction in which the mask bodies 114 and 114A are wound.
Due to this, a predetermined tension is always applied to the mask bodies 114 and 114A.

The mask bodies 114 and 114A between the wrapping rod 116 and the lengthwise mask heads 62 and 64 are parallel to the printing paper mounting surface of the mounting table 74, and a slight gap is provided between the mask body 114 and 114A. . Therefore, the lengthwise mask heads 62 and 64 and the mask body 11
In the state where the length direction mask heads 62 and 64 are aligned with each other along the optical axis L, the reference numerals 4 and 114A form a guide space for the photographic paper 12 with the mounting table 74, and the photographic paper is conveyed in the arrow A direction. In this case, the tip can be properly guided.

A cutout 122 is formed between the lengthwise mask head 62 and the L-shaped metal fitting 110 so that the leading edge of the printing paper conveyed in the direction of arrow A does not carelessly touch the corner of the lengthwise mask head 62. It is like this. Also, lengthwise mask head 6
Chamfers 124 and 126 are provided on the upper surfaces of the facing portions of the reference numerals 2 and 64 so that a concave surface is formed toward the light source (upward in FIG. 3).

As shown in FIGS. 4 and 5, the width direction mask head 66
Both ends in the longitudinal direction are fixed to the moving blocks 130 and 132. Guide rods 134 and 136 which are arranged at right angles to the photographic paper transporting direction and which are bridged to the upstream and downstream frames 60 in the photographic paper transporting direction penetrate through these moving blocks 130 and 132. Therefore, the width-direction mask head 66 can be moved in parallel to the direction in which the printing paper is conveyed.

Further, both ends of the width direction mask head 68 also move and block.
It is fixed to 130A and 132A, and these moving blocks 13
The guide rods 134 and 136 also penetrate through 0A and 132A, and the width-direction mask head 68 moves along the guide rods 134 and 136. Therefore, the width direction mask head 66, 68
Can move closer to and away from each other about the optical axis A. The guide rods 134 and 136 have the arm 13 at the center.
It is supported by frame 60 at 8 for reinforcement.

Moving blocks 130, 132, 130A, 13 as shown in FIG.
2A is attached to the middle portion of the endless belt 140. This endless belt 140 has pulleys 142, 144, 146, 14 at the middle portion.
It has been turned around by being wound around 8, 150 and 152, respectively. The pulleys 142 and 148 are disposed below the guide rods 134 and 136, respectively, on one side in the photographic paper transport direction, and are attached to the bracket 15
The frame 60 is axially supported via 4 and 156, respectively.
Further, the pulleys 14, 146, 150, 152 are each a guide rod 1
It is disposed below 34 and 136 on the other side of the printing paper conveyance direction, and is pivotally supported on the frame 60 by brackets 158 and 160.

Therefore, the endless belt 140 has a double U-shape as a whole, and the inner U-shaped track between the pulleys 142, 152, 150 and 148 and the outer side between the pulleys 142, 144, 146 and 148. U-shaped tracks, which are between the pulleys 142 and 144, 152 and between the pulleys 148 and 146, 1
Between 50 and 50 are the legs of the U-shape. The double U-shaped configuration has the inner raceway and the outer raceway parallel to each other in the U-shaped legs, and the moving block 132 is a U-shaped leg portion between the pulley 146 and the pulley 148 via the bracket 162. To the outer track, and the transfer block 130 is attached to the inner track of the U-shaped leg between the pulley 142 and the pulley 152 via the bracket 162. Further, the moving block 132A is attached to the inner raceway between the pulleys 148 and 150 on the U-shaped leg, and the moving block 130A is attached to the outer raceway of the U-shape leg between the pulleys 142 and 144. .

Therefore, when the endless belt 140 is moved in one of the longitudinal direction and the other direction, the width-direction mask heads 66 and 68 can be moved forward and backward while maintaining a parallel state with respect to the optical axis L to change the distance. It has become.

An endless belt 168 is stretched between the pulley 146 and the output shaft pulley 166 of the motor 164, so that the endless belt 140 is driven. The rotation of the endless belt 168 is controlled by the control means 108.

As shown in FIG. 5, the width direction mask heads 66 and 68 are formed with notches 172 between the moving blocks 130 and 132 and the moving blocks 130A and 132A, and the notches 172 are provided over the entire longitudinal direction. The upper surfaces of the movable blocks 130 and 132 and the movable blocks 130A and 132A are at the same level as the photographic paper mounting surface of the mounting table 74, and the leading end of the photographic paper 12 is indicated by the arrow A.
The widthwise ends of the cutout 172 are
It is inserted into the inside of the photographic printing paper so that the two edges of the printing paper in the width direction can be prevented from floating.

As shown in FIG. 1, the nipping and conveying rollers 174 and 176 are arranged at the downstream end of the frame 60.
An endless belt 178 is stretched between the nipping / conveying roller 36 and the nipping / conveying roller 36, and receives a rotational driving force in synchronization with the nipping / conveying roller 36.

(Explanation of Conveyance Processing Section 16) In the conveyance processing section 16, a printer 182 for printing on the back side of the photographic printing paper 12 after printing sent from the photo printing section 14 and a cutter for cutting the photographic printing paper 12 for each image 184 is provided. A sensor 186 is provided on the upstream side of the cutter 184 so that the leading edge of the printing paper can be detected.

The photographic printing paper 12 cut for each image is stored in the stock unit 188. Adjacent to the stock portion 188, a feeding means 190 is provided for feeding the cut photographic paper 12 to the developing portion 18 one by one after adjusting the processing speeds of the photo printing portion 14 and the developing portion 18. .

(Operation of Embodiment) At the start of printing, the box 20 accommodating the photographic printing paper 12 wound in a roll shape is mounted on the machine base 22. The leading end of the photographic printing paper 12 protruding from the box 20 is inserted into the space between the sandwiching and conveying rollers 28, 30 which are separated from each other.

When a printing start button (not shown) is operated, the solenoid
34 operates to cause the nipping and conveying roller 30 to approach the nipping and conveying roller 28 and nips the leading edge of the photographic paper 12, and the motor 32 drives the photographic paper.
Send out 12 tips. The leading end portion of the photographic printing paper 12 sent out is nipped and conveyed by the driving force of the motor 40.
It is conveyed in the direction of arrow A while being sandwiched between 38.

Here, the lengthwise mask heads 62 and 64 drive the motor 104 to keep them in close contact with each other on the optical axis L. The width-direction mask heads 66 and 68 drive the motor 164 in accordance with the width dimension of the photographic printing paper 12 to be conveyed, so that both ends of the photographic printing paper 12 in the width direction are inserted into the notches 172.

As a result, the photographic printing paper 12 fed in the direction of the arrow A is formed by the lengthwise mask heads 62, 64 and the mask bodies 114, 114A at the center in the widthwise direction of the leading end, and by the notches 112 in the widthwise mask heads 66, 68 at the widthwise both ends. Smooth photo printing 14
You will be guided inside. Especially the width direction mask head 66, 68
The notch 172 can prevent the photographic paper 12 from meandering when it advances.

When the motor 40 is driven to rotate further, the leading edge of the photographic paper 12 is discharged by the discharge opening 72 of the frame 60 due to the rigidity of the photographic paper 12.
It is sent out from and is sandwiched and conveyed by the sandwiching and conveying rollers 174 and 176. Further, this tip portion is conveyed in the direction of arrow A, and when it reaches the sensor 186, the driving of the motors 32 and 40 is temporarily stopped. In this state, the motors 32 and 40 are further rotated by a predetermined number of revolutions, and the leading end of the photographic printing paper 12 is inserted into the cutter 184 by a predetermined amount and cut.

Here, the motor 40 reversely rotates and the cut-out paper leading end is once retracted to the sensor 48 portion.

In this case, the motor 44 rotates and the guide plate 42 is lifted up to the imaginary line state in FIG. 1, and the intermediate portion of the photographic paper 12 becomes a loop shape as shown by the imaginary line to absorb the backward stroke of the leading edge of the photographic paper. .

This state is the state in which printing can be started, and the motor 40 rotates according to the size of the printing image that has been input in advance.
The cut leading end of the photographic paper 12 is sent to the photo printing unit 14. The leading ends of the photographic printing paper 12 are in close contact with each other as in the previous time, and the longitudinal mask heads 62 and 64 and the mask body 11 are attached.
The intermediate portions in the width direction are smoothly guided by 4, 114A, and the both ends in the width direction are smoothly guided by the width-direction mask heads 66, 68 to be mounted on the mounting table 74.

When the front end of the photographic paper 12 passes the optical axis L and moves by a half of the size of the print image from the optical axis L, the driving of the motor 40 is stopped.

Here, the motor 104 is driven and the longitudinal mask heads 62, 6
4 are separated from each other and stop corresponding to both ends in the longitudinal direction of the size of the printed image. At the same time, the image on the negative film is printed on the photographic printing paper 12 by printing light from a light source (not shown).

This printing state is a state in which there is an edge around which the image is not printed, around the printing portion of the printing paper 12, the length direction mask heads 62 and 64 and the width direction mask head. It is formed by being covered by 66 and 68 (particularly notch 172).

When forming an image over the entire area of the photographic paper without providing an edge portion that does not print around the image to be printed, the motor 104,
The motor 164 may be further driven by a slight amount to separate the lengthwise mask heads 62, 64 and the widthwise mask heads 66, 68 from each other by a slight amount, that is, the width dimension of the edge portion.

When sending the photographic paper 12 again after printing,
104, drives the motor 164, and lengthwise mask heads 62, 64
Again in contact with each other and the width direction mask head 6
The widths of both ends of the photographic printing paper 12 in the notches 172 are set to 6 and 68. This allows the photo printing section 14 of the photographic paper 12 to be printed.
The photographic printing paper 12 is smoothly guided and sent to the transport processing unit 16 as in the case of being fed into the paper.

The sent photographic paper 12 is cut by a cutter 184 of the carrying processing unit 16, stored in the stock unit 188, and then sent to the developing unit 18 by the sending means 190 for development processing.

The motor 32 provided for conveying the printing paper in the above embodiment
Can be omitted, and in this case, the leading end of the photographic printing paper 12 protruding from the box 20 may be manually inserted into the space between the nipping and conveying rollers 36, 37.

In the above embodiment, the light source is arranged above the mounting table 74 to perform the printing.However, the apparatus is turned upside down and the mounting table is arranged above the photographic paper conveying path, and the printing is performed from the bottom to the top. It can also be applied when printing is performed.

Further, the mask bodies 114 and 114A are not limited to cloth and the like, and any flexible material can be applied. Further, in the above-mentioned embodiment, the driving force of the motor is transmitted through the endless belt as the means for driving the mask head, but the present invention is not limited to the belt, and any means that is flexible and capable of transmitting the driving force can be applied. .

〔The invention's effect〕

As described above, the photographic printing apparatus according to the present invention is provided with a mounting base on which the printing paper is mounted at the time of printing onto the printing paper, and both sides of the optical axis for printing the printing paper and moving back and forth along the printing paper transport direction. A pair of lengths that change the interval to determine the printing range and move forward and backward so that the leading edge of the printing paper does not get caught when the leading edge of the printing paper is fed in to eliminate the gap between them and keep the leading edge parts aligned with each other. Direction mask and the lengthwise mask, each of which is formed following the tip end portion of the lengthwise mask and has flexibility and has a proximal end portion wound up in layers and the lengthwise mask when the leading end portion of the printing paper is fed. A pair of mask bodies are provided to prevent the printing paper from rising when the leading edge of the printing paper is fed by providing a printing paper transport space between the leading end of the printing paper and the mounting base, and a mounting base and a pair of lengthwise masks. Both sides of the optical axis of the printing paper A pair of width-direction masks that are arranged and that move forward and backward in the direction perpendicular to the photographic paper conveyance direction and change the distance between them to determine the printing range, and are formed along the edges of the pair of width-direction masks facing the mounting table. Since it has a notch part which is formed on both sides of the photographic paper in the width direction and has a notch, the mask has an excellent effect that it can also serve as a guide means for the leading end of the photographic paper.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic vertical sectional view of a photographic processing apparatus to which the present invention is applied, FIG. 2 is a plan view showing a lengthwise mask head of a photographic printing portion and its relation, and FIG. Fig. 2 III-III line sectional view,
FIG. 4 is a rear view of FIG. 2 showing the widthwise mask and its relation, and FIG. 5 is an exploded perspective view showing the main parts of the photoprinting section. 10 ... Printing paper storage unit, 12 ... Printing paper, 14 ... Photo printing unit, 16 ... Conveyance processing unit, 18 ... Development unit, 62 ... Length direction mask head, 64 ... Length direction mask head, 66 …… Width direction mask head, 68 …… Width direction mask head, 74 ……
Mounting stand, 114 …… Mask body, 114A …… Mask body,

Claims (1)

[Claims] 1. A mounting base on which the printing paper is mounted when printing onto the printing paper, and both sides of the optical axis of the printing paper printing are arranged to advance and retreat along the printing paper conveyance direction to change the interval between them to determine the printing range. And a pair of lengthwise masks for advancing and retracting so that the leading edge of the photographic paper does not get caught when the leading edge of the photographic paper is fed so that there is no gap between them and the leading edge portions are aligned with each other; The base portion is formed in a layered manner following the tip portion of the mask and has flexibility, and the base end portion is wound up in layers. Between the mounting base and the pair of lengthwise masks, a pair of mask bodies that prevent the photographic paper from rising when the leading edge of the photographic paper is fed in by providing a photographic paper transport space between It is arranged on both sides of the shaft and A pair of widthwise masks that advance and retreat in the angular direction and change the distance between each other to determine the printing range, and are formed along the edges of the pair of widthwise masks facing the mounting base and receive both ends in the width direction of the printing paper. A photographic printing apparatus, comprising: