JPH0518404B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to an automatic photoprinting apparatus for exposing and printing photosensitive materials.

[Technology background]

Generally, in an automatic photographic printing apparatus, a photographic light-sensitive material, such as a black and white photographic paper or a color photographic paper having a photosensitive layer containing a dye image-forming substance such as a yellow dye substance, a magenta dye substance and a cyan dye substance, etc. (hereinafter referred to as "photographic paper")
That's what it means. ) are sequentially transferred to an exposure section, where an optical image corresponding to the already photographed and developed negative film is projected onto photographic paper for exposure processing,
The exposed photographic paper is sequentially discharged. The exposed photographic paper obtained in this way can be developed and
The film is transferred to an automatic developing device that has multiple processing tanks for fixing, stabilizing, washing, etc., and undergoes various processing steps to become a finished product.

Incidentally, in recent years, from the perspective of speeding up the development process, end-users such as camera stores have begun carrying out a series of processing steps, from developing the negative film to printing and developing it on photographic paper, to obtaining the finished product. Therefore, it is desired to develop an automatic photographic printing and developing system having a relatively compact and simple configuration.

However, conventional automatic photo printing devices of this type generally suffer from incomplete automation in a series of operations such as loading, exposing, and transporting photographic paper, large losses of photographic paper, or problems with automatic developing devices. However, there are still many issues that need to be improved, such as the fact that it is not easy to systemize the system.

For example, one example of a conventional automatic photo printing device is one in which photographic paper is loaded manually. This method not only has low work efficiency, but also has problems such as easy operation errors.

[Purpose of the invention]

The present invention was made against the above-mentioned background, and its purpose is to automatically load photographic paper, minimize loss of photographic paper during loading, and to smoothly load photographic paper. An object of the present invention is to provide an automatic photographic printing device capable of achieving reliable automatic loading and automatic printing of photographic paper.

[Means and actions for achieving the purpose]

The above purposes are: (a) an exposure section that projects a light image to be printed and prints it onto photographic paper; (b) a paper feed section that feeds unprocessed photographic paper from a magazine to the exposure section; (c) (d) a feeding accumulator section for accumulating photographic paper between the exposure section and the paper feeding section; (d) a closed state along a paper path passing through the feeding accumulator section; (e) a guide plate that is opened and closed between an open state that allows the formation of a paper loop and a closed state when photographic paper is loaded; (f) A loop detection sensor that controls the paper feeding section so that a certain amount of photographic paper is accumulated in the feeding accumulator section; (g) A detection sensor located downstream of the paper feeding section that detects the leading edge of photographic paper when it is loaded, and (h) A signal from the detection sensor that stops the paper feeding section and opens the guide plate. control means for reversing the paper feeding section and transporting the photographic paper in the opposite direction until the leading edge of the photographic paper is located immediately behind the paper feeding section; This is achieved by an automatic photoprinting device characterized in that a paper loop is formed in the emulator section.

In the apparatus having the above configuration, automatic loading of photographic paper is achieved in the following manner.

First, the photographic paper pulled out from the magazine is automatically transported by the paper feeding section, passes through the exposure section, reaches the paper feeding section, and is further transported in the forward direction by the paper feeding section. When the leading edge of the photographic paper is detected by the detection sensor, the control means operated by the signal from the sensor detects the leading edge of the photographic paper.
The driving of the paper feeding section is stopped, the guide plate is opened, and the paper feeding section is reversed so that the photographic paper is transported in the opposite direction until its leading edge is located immediately behind the paper feeding section. A paper loop is reliably formed in the feeding accumulator section, and a portion of the photographic paper is accumulated.

In addition, in the feeding accumulator section, when the loop sensor detects the reduction of the accumulated paper loop, the paper feeding section is driven and the photographic paper is fed. A certain amount or more of paper is always accumulated in the printing section, and as a result, when the paper is conveyed in the forward direction during the printing process, unreasonable tension is prevented from being applied to the paper.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

In FIG. 1, reference numeral 1 represents the main body of an automatic photo printing apparatus, and the interior of the main body 1 is shielded from light by a case 11 (partially omitted). This main body 1
An exposure section 2 is provided at the lower center of the case 11, and an exposure mechanism 3 for projecting an optical image corresponding to a negative film onto the exposure section 2 at the upper center thereof. An inlet 12 for introducing photographic paper to be exposed (hereinafter simply referred to as "paper") and an outlet 13 for discharging the exposed paper are formed. Main body 1
The paper passage generally extends downward from the inlet 12 to the feeding accumulator section A1.
It reaches the exposure section 2 via the exposure section 2, and after further passing through the exposure section 2, it extends upward and reaches the outlet 13 via the discharge accumulator section A2. Along the paper path PA leading from the inlet 12 to the exposure section 2, a paper loop is formed in the paper feeding section 4 for sending out the paper drawn out from the magazine 40 attached to the main body 1 and the feeding accumulator section A1. A movable guide part 5 is provided which contributes to the formation of the exit 1 from the exposure part 2.
Along the paper path PB leading to No. 3, there is a paper feed section 6, a hole punch section 10, a cutter section 20, a hole detection sensor 30, and a paper loop for forming a paper loop and transporting paper in the discharge accumulator section A2. The discharge portions 7 are sequentially arranged.

The exposure section 2 includes a base 21 fixed to the main body 1,
disposed on the base 21 via a paper path,
It is composed of a printing frame 23 for defining an exposure area 22. Reference numeral 24 denotes a plate-shaped or frame-shaped load guide provided on one end side of the baking frame 23. This load guide 24 is connected to a lifting motor 27 via a worm wheel 25 and a worm gear 26, and is moved vertically around its lower end. It is pivotably supported for rotation in the horizontal direction. When automatically loading paper, the load guide 24 is lowered to the exposure area 22 to form a paper passage gap G between it and the base 21, and during exposure, the load guide 24
or, if the load guide 24 also serves as a baking frame, keep it in a lowered state.
28 and 29 are limit switches for detecting the upper and lower limit positions of the load guide 24 and controlling the operation of the lifting motor 27, respectively.

In the illustrated example, the exposure mechanism 3 operates a light source 31 having a built-in cut filter (three primary colors of yellow, magenta, and cyan), a negative carrier 32 holding a negative film F, a lens 33, and an electromagnetic solenoid 34. A dark shutter 35 that opens and closes is arranged in order from above, and a photometric element 36 is provided around the lens 33 for detecting light transmitted through the film to control the selection of a cut filter and the operation of the dark shutter 35.

The paper feeding section 4 has a feeding roller 41 and a pressure roller 42 arranged facing the inlet 12, and the feeding roller 41 is rotated clockwise by a motor 43 having a built-in overrunning clutch. The pressure roller 42 is driven by a link mechanism and a lever 44 (not shown), and is configured to be switchable between a rest position where it is spaced above the feed roller 41 and an operating position where it is pressed by the feed roller 41. has been done.

The magazine 40 includes a box main body 45 that stores rolls of paper to be exposed, and a paper drawer 46 that projects from the upper side wall of the box main body 45. The paper drawer 46 is connected to the main body 1 from the inlet 12.
As shown in detail in FIG. 2, it is composed of an upper guide plate 1a, a lower guide plate 1b, and side plates 2a, 2b. Notches 3a and 3b are formed for receiving the lower part of the feed roller 42 and the upper part of the feeding roller 41.

In FIG. 1, 50a and 50b are a pair of paper guides that guide the paper in the vertical direction, and 47 is a paper detection switch.

The movable guide section 5 has a guide plate 51 (indicated by a two-dot chain line) located on an extension of the paper guide 50a.
The upper end of this guide plate 51 is pivotally attached to a shaft 52, and the tip of the guide plate 51 is
It is connected to one end of a tension spring 53 that is spaced apart from the paper path P shown by the dotted chain line in the direction in which the feeding accumulator section A1 is formed and that suppresses the opening state. Further, the shaft 52 is connected to the electromagnetic solenoid via a pinion gear 54 fixed thereto and a rack gear 55 meshing with the pinion gear 54.
6 and is connected to be rotationally driven.

A11 is a loop detection sensor for detecting a paper loop formed in the feeding accumulator section A1, R1 is a guide roller, and 60 is a turn guide consisting of a large number of rollers. It is bent horizontally to the opposite side (to the right in the figure) from the mulleter part A1.

The paper feeding section 6 is provided at a downstream position close to the exposure section 2. The paper feed section 6 includes a feed roller 61 and a pressure roller 62 that are arranged opposite to each other in the paper path PB.
1 is rotated by a pulse motor 63 in the forward or reverse direction. R2 is a turn roller that turns the paper vertically upward.

70a and 70b are a pair of paper guides that guide the paper from the exposure section 2 almost vertically upward, and the paper guides 70a and 70b have an arcuate guide section 701 curved to the right toward the outlet 13 at their upper ends. and 702 are formed, and a guide roller R3 is provided at the tip of the arcuate guide 702 of the paper guide 70b. The radius of curvature of the arcuate guide portion 701 is
The radius of curvature is smaller than the radius of curvature at the tip of the guided paper, that is, the radius of curvature of the curved portion caused by the curling of the paper, thereby stably transporting the paper along the arcuate guide portion 701. .

As shown in an enlarged view in FIG. 3, the paper discharge section 7 includes two mechanisms, namely, a loop guide mechanism 8 for smoothly forming a paper loop in the discharge accumulator section A2 and transporting the paper loop; It is comprised of a conveyance mechanism 9 for conveying paper out of the main body 1 through an outlet 13.

The loop guide mechanism 8 is provided with a guide roller R4 that guides the tip of the paper loop on the paper discharge side of the discharge accumulator section A2, and further includes a guide roller R4 and a guide roller R3 on the paper introduction side of the discharge accumulator section A2. A loop forming roller R5 is disposed at a position approximately midway between the two. The loop-forming roller R5 is pivotally attached to the distal end of a mounting board 82 whose base end is supported by a fulcrum shaft 81 via a mounting member 83. A regulating roller 85 is provided in the middle of the mounting board 82 at a position in contact with the guide roller R4 via the mounting member 84, and the regulating roller 85 and the guide roller R4 form a feed guide roller section. Further, an entrainment prevention roller 86 is further connected with a gear to the regulation roller 85. A cam roller 87 is provided on the base end side of the mounting board 82 and is driven in accordance with the rotation of the cam 71, the details of which will be described later.

The conveying mechanism 9 constituting the paper discharging section 7 includes a discharging roller 91 and a pressure roller 92 provided inside the outlet 13 and facing each other in the paper path PB. The discharge roller 91 has a built-in one-way clutch, is rotatable only in the clockwise direction, and is driven by the motor 72. The pressure roller 92
is a mounting board 94 whose base end is pivotally supported on a fulcrum shaft 93.
It is attached to the tip of the shaft. Further, a cam roller 95 is provided at the lower end of the mounting board 94 and follows the rotation of the cam 71, the details of which will be described later.

The cam 71 is a shell-shaped eccentric cam with an enlarged diameter at one end. This cam 71 has a built-in one-way clutch, can rotate only counterclockwise around a camshaft 76, and is driven by the motor 72. Ru. 73 is a switch for detecting the rotational position of the cam 71.

74a and 74b are paper guides;
5 is a paper detection sensor provided inside the outlet 13. Further, in FIG. 1, A21 is a loop detection sensor for detecting a paper loop formed in the discharge accumulator section A2.

Next, the operation of the printing apparatus configured as described above will be explained.

Paper loading is performed automatically as follows.

First, in preparation for moving to paper conveyance,
The electromagnetic solenoid 56 in the movable guide section 5 is operated to close the guide plate 51 (the state indicated by the two-dot chain line in the figure), and the lifting motor 27 in the exposure section 2 is operated to lower the load guide 24. , thereby forming a paper conveyance path. In addition, in the paper discharge section 7, as shown by the two-dot chain line in FIG. 3, the loop forming roller R5, the pressure roller 92, etc.
It is set to a more distant state (initial state). That is, when the cam 71 is rotated counterclockwise by reversing the motor 72, its large diameter portion contacts the cam rollers 95 and 87 and pushes them up, so that the mounting boards 94 and 82 are rotated accordingly. The rollers rotate about the respective fulcrum shafts 93 and 81, and as a result, the loop forming roller R5, regulation roller 84, and entrainment prevention roller 86 on the mounting board 94 and the pressure roller 92 on the mounting board 94 rise.

Paper is fed in the above state. As shown in FIG. 2, the magazine 40 is in a state in which one end of the paper is pulled out from the roll stored therein to the tip of the paper drawer part 46, and the paper drawer part 46 is brought into a rest position with the feeding roller 41. It is inserted between a certain pressure roller 42 (indicated by a two-dot chain line in FIG. 1), and then the pressure roller 4 is
2, loading of the magazine 40 is completed. At this time, the pressure roller 42 and the feeding roller 41 are in a state where the paper Q is pressed between the notches 3a and 3b of the paper pull-out section 46 in the magazine 40.

In this state, the motor 43 in the paper feeding section 4 and the pulse motor 63 in the paper feeding section 6 are driven. The feeding roller 41 and the pressure roller 42 are rotated by the drive of the motor 43 in the paper feeding section 4, and the paper sent out thereby is transferred to the movable guide section 5 and the guide roller R.
1. The paper passes through the turn guide 60 and the exposure section 2, is conveyed to the paper feed section 6, reaches the feed roller 61, is further conveyed by the rotation of the feed roller 61, and then passes through the turn roller R2 and the hole punch section. 10 and the cutter part 20. When the leading edge of the paper is detected by the hole detection sensor 30, the motor 43 in the paper feeding section 4 and the pulse motor 63 in the paper feeding section 6 are stopped, and the conveyance of the paper is temporarily stopped.

In the above, the circumferential speed of the feed roller 61 in the paper feed section 6 is set higher than the circumferential speed of the feed roller 41 in the paper feed section 4, so that after the paper reaches the feed roller 61, the The feed roller 41 is conveyed in synchronization with the circumferential speed of the roller 61, and at this time, the feed roller 41 is driven by the operation of the one-way clutch of the motor 43.
Overrunning according to the rotation speed of 1.

Next, the electromagnetic solenoid 56 in the movable guide section 5 is turned off to release the guide plate 51 from being restrained. The released guide plate 51 is the tension spring 5
A tensile force of 3 results in an open state as shown by the solid line in FIG. In this state, the pulse motor 63 of the paper feed section 6 is rotated in reverse so that the leading edge of the paper is positioned slightly downstream of the feed roller 61, for example.
Return the paper to the position marked with * in Figure 1 and transfer it. At this time, by keeping the feeding roller 41 in the paper feeding section 4 in a stopped state, paper corresponding to the amount of paper for reverse transport is accumulated in a loop shape in the feeding accumulator section A1. Then, in preparation for the next exposure process, the load guide 24 in the exposure section 2 is raised,
Exposure area 22 is opened. However, if the load guide 24 functions as a baking frame, there is no need to raise it. This completes automatic paper loading.

As described above, in the present invention, the magazine 40
It is possible to automatically pull out the paper and set it in the exposure section, and the leading edge of the paper is set at the position immediately after passing the paper feeding section 6 (the position marked with *) by returning the paper. Paper loss is minimized.

For the paper loaded as above,
Exposure processing is performed in the exposure section 2. In this exposure process, normally, the transmitted light density (LATD) of the negative film F is first measured by the photometric element 36, and the color balance and color density are automatically adjusted based on this, and further corrections are made by the operator. In addition, the marking conditions are determined. The opening and closing of the cut filter and the dark shutter 35 in the light source 31 are controlled in accordance with this lighting condition, and exposure is performed. When the exposure is completed, the pulse motor 63 of the paper feed section 6 rotates in the normal direction to convey the paper a predetermined length, and the next unexposed area is transferred to the exposure area 22 to be sequentially exposed.

In the feeding accumulator section A1, as the amount of accumulated paper decreases as the exposure process progresses, the tip of the paper loop rises and the loop detection sensor A11 detects the contraction of the loop. The motor 43 is activated and paper is fed until the paper reaches the level of the loop detection sensor A11. Therefore, more than a certain amount of paper is always accumulated in the feeding accumulator section A1, and this causes stress on the paper when it is conveyed in the forward direction by the paper feeding section 6. The tension is prevented from acting, allowing smooth and accurate paper feeding, and as a result, smooth and reliable printing of photographic paper can be achieved.

On the paper that has undergone the exposure process, holes are punched at specific positions in the hole punch section 10 based on information input in advance according to the size and style of the printing screen. This punch hole is used as a cut position indication mark for automatically cutting the paper screen by screen after the subsequent development and drying process, or as a cut position indication mark for forced cutting to be described later. The paper is further conveyed by a feed roller 61 and transferred to the paper discharge section 7 via the cutter section 20 and hole detection sensor 30.

The paper guided by the paper guides 70a and 70b and reaching the paper introduction side of the discharge accumulator section A2 crosses the upper space of the discharge accumulator section A2, as shown by the two-dot chain line in FIG. Paper guides 74a and 74b
It is transported while being guided by. At this time, the paper has its own elasticity (so-called elasticity)
The leading end of the paper is transferred along the arcuate guide portion 701 of the paper guide 70a, and after reaching the guide roller R4, the paper is transferred along the paper guides 74a and 74b, and is then transferred to the discharge accumulator portion A2. Never fall. and,
When the leading edge of the paper is detected by the paper detection sensor 75, the operation of the paper feeding section 6 is stopped, and paper conveyance is stopped.

Note that detection of whether or not the paper has been normally transferred in the upper space of the discharge accumulator section A2 is performed, for example, as follows. That is, the amount of paper transferred after passing the hole detection sensor 30 is monitored, and when the amount of paper transferred has almost reached a length corresponding to the conveyance distance between the hole detection sensor 30 and the paper detection sensor 75, the paper is transferred. If the leading edge of the paper is detected by the paper detection sensor 75, it is determined to be normal, but if it is not detected, it is abnormal and a warning is issued to that effect.

As described above, after the leading edge of the paper is detected by the paper detection sensor 75 and the paper transport is stopped, the motor 72 is reversed and the cam 71 is rotated 180 degrees counterclockwise, and the cam 71 is rotated 180 degrees counterclockwise. Then, the cam rollers 87 and 95 descend, and as a result, the loop guide roller R5, the regulation roller 85, the entrainment prevention roller 86, and the pressure roller 92 descend, resulting in the state shown by the solid line in the figure. In this state,
The leading edge of the paper is pressed and fixed by a discharge roller 91 and a pressure roller 92, and on the paper introduction side of the discharge accumulator section A2, the paper is pressed down from above by a loop forming roller R5 and curved downward. Therefore, when the paper feed section 6 is operated again with the motor 72 stopped to convey the paper in the forward direction, the paper descends while being curved downward by the loop forming roller R5, forming a loop of an unspecified shape. is accumulated in the discharge accumulator section A2 while forming. When more than a certain amount of paper is accumulated in the discharge accumulator section A2, the motor 72 is rotated in the normal direction to rotate the conveying roller 91 clockwise to start discharging the paper. From the discharge accumulator section A2, the paper passes between the guide roller R4 and the regulating roller 85, further between the discharge roller 91 and the pressure roller 92, and is discharged from the outlet 13 to the outside of the main body 1.

At this time, the regulation roller 85 rotates counterclockwise as the paper is transferred, and the entrainment prevention roller 8
6 is gear-connected to the regulating roller 85, so that it rotates clockwise in conjunction with this. In this manner, by rotating the entrainment prevention roller 86 clockwise, paper conveyance abnormalities are prevented. That is, for example, as shown in FIG. 4, in a case where an overlapping portion J is generated in the paper portion to be conveyed, when the entrainment prevention roller 86 rotates clockwise, this overlapping portion J is caused to overlap the paper to be conveyed. As a result, the paper is not caught between the guide roller R4 and the regulating roller 85 in an overlapping state, and smooth paper conveyance can be achieved.

The paper accumulated in the discharge accumulator section A2 is discharged from the main body 1 through the outlet 13 as described above, and is continuously supplied to an automatic developing device (not shown) at a constant speed corresponding to its processing speed. In other words, in an automatic developing device, it is generally necessary to convey and develop the exposed paper at a specific, constant speed required for the prescribed development, but normally, the exposure process in an automatic photo printing device is The processing speed is higher than the development processing speed in an automatic developing device. Therefore, it is preferable to provide a discharge accumulator section A2 in the main body 1 of the printing apparatus and accumulate the exposed paper therein, since the development process can be carried out without interruption.

Next, forced cutting of paper during paper ejection will be explained.

When the exposure operation in the automatic photo printing device is interrupted, the operation of the paper feed section 6 is stopped and paper is no longer supplied to the discharge accumulator section A2. The discharge roller 91 continues to be driven to only discharge the paper, and the paper accumulated in the accumulator section A2 gradually decreases. Therefore, if the paper continues to be ejected, the paper will break, so in such a case, when the paper accumulated in the ejection accumulator section A2 has decreased to a certain amount, the paper should be cut out. An automatic cutting operation (hereinafter referred to as "forced cutting") is performed by the section 20.

Specifically, this forced cut is performed as follows. When the loop detection sensor A21 detects the shrinkage of the paper loop in the discharge accumulator section A2, the pulse motor 63 of the paper feed section 6 is reversed to transport the paper back to the cutter section 20 side. However, this reverse transport operation cannot be performed if the above-mentioned point in time when the loop detection sensor A21 stops detecting the paper is in progress while other operations (such as exposure or transporting the paper in the forward direction by the paper feed unit 6) are in progress. If the operation overlaps with the above, it will be performed after these other operations are completed. Then, the hole detection sensor 30 detects the above-mentioned holes formed during the conveyance after exposure, and then the reversely transported paper is detected based on the information obtained by reading the holes. The cutter unit 20 forcibly cuts the burned screen at an appropriate position depending on the type of screen.

The paper left on the paper feeding section 4 side by the forced cut is conveyed in the forward direction by the paper feeding section 6 by a length corresponding to the distance traveled backward.
As a result, the paper returns to the state before the reverse transport, and the next exposed area that has been exposed is set in the exposure section 2. Therefore, the next exposed area is set without any paper loss. exposure can be performed.

On the other hand, the paper transferred to the discharge accumulator section A2 after forced cutting is transferred in the forward direction by the conveyance mechanism 9, and is supplied from the outlet 13 to the automatic developing device. Then, when the rear end of the paper is detected by the paper detection sensor 75, the motor 72
is reversed and the cam 71 rotates 180 degrees counterclockwise, thereby raising the loop guide roller R5, the regulating roller 85, the entrainment prevention roller 86, and the pressure roller 92, similarly to when loading the paper, and the third The initial state shown by the two-dot chain line in the figure is restored. Thereafter, the paper is conveyed in the paper discharge section 7 by the same operation as described in the case of paper loading. By the way, the next paper cannot be conveyed to the paper discharge section 7 until the return to the initial state is completed after the forced cutting described above. Therefore, the longer the time required during this period, the lower the processing efficiency will be, which is not preferable. Therefore, in order to alleviate such inconvenience, when discharging the forcibly cut paper, the motor 7 is set so that the transport speed is sufficiently high compared to the processing speed of the automatic developing device.
The rotation speed of 2 is automatically controlled to rapidly advance the paper. This makes it possible to shorten the time loss from, for example, several tens of seconds to several seconds.
Further, the rapidly fed paper may be stored in a paper accumulator section provided in the automatic developing device, for example.

〔Effect of the invention〕

As described above, according to the present invention, photographic paper can be pulled out from a magazine and automatically loaded into the exposure section, and furthermore, the photographic paper can be returned and transported so that its leading edge is positioned immediately after the paper feeding section. This makes it possible to minimize loss of photographic paper during loading, and achieve smooth and reliable automatic loading of photographic paper. In addition, when transporting photographic paper back, the paper feeding section is stopped and the guide plate is opened, so that a paper loop is reliably formed in the feeding accumulator section, and a loop detection sensor always keeps a constant amount of paper. Since the above amount of paper will be accumulated in the feeding accumulator section,
During the printing process, when the paper is transported in the forward direction, undue tension is prevented from acting on the photographic paper, and smooth and reliable printing of the photographic paper can be achieved.

[Brief explanation of the drawing]

Fig. 1 is an explanatory view showing the entire internal structure of an embodiment of the present invention, Fig. 2 is an explanatory perspective view showing an enlarged view of the magazine and paper feeding section, and Fig. 3 is an enlarged view of the paper ejection section. FIG. 4 is an explanatory diagram showing a part of the paper discharge section. 1... Main body, 11... Case, 12... Entrance,
13...Exit, A1...Feeding accumulator section, A11...Loop detection sensor, A2...Discharge accumulator section, A21...Loop detection sensor, PA, PB...Paper passage, 2...Exposure Part, 2
1...Base, 22...Exposure area, 23...Printing frame,
24...Load guide, 3...Exposure mechanism, 31...
...Light source, 32...Negative carrier, 33...Lens, 35...Dark shutter, 36...Photometering element, 4...Paper feeding unit, 41...Feeding roller,
42... Pressure roller, 40... Magazine, 45...
... Box body, 46 ... Paper drawer section, 5 ... Movable guide section, 51 ... Guide plate, 54 ... Pinion gear, 55 ... Rack gear, 6 ... Paper feed section,
61...Feed roller, 62...Pressure roller, 63
...Pulse motor, 70a, 70b...Paper guide, 701,702...Circular guide portion, 7...
...Paper discharge section, 8...Loop guide mechanism, 9...
... Conveyance mechanism, R4 ... Guide roller, R5 ... Loop forming roller, 82 ... Mounting board, 85 ... Regulation roller, 86 ... Entrainment prevention roller, 87 ... Cam roller, 91 ... Discharge roller, 92 ...Crimping roller, 94...Mounting board, 95...Cam roller,
71... cam, 72... motor, 10... hole punch section, 20... cutter section, 30... hole detection sensor.

Claims (1)

[Claims] 1 (a) an exposure section that projects a light image to be printed and prints it onto photographic paper; (b) a paper feed section that feeds unprocessed photographic paper from a magazine to the exposure section; ( c) a feed accumulator section for accumulating photographic paper between the exposure section and the paper feed section; (d) a closed state along a paper path passing through the feed accumulator section and from the paper path; (e) a guide plate that is opened and closed to allow paper loops to form at a distance, and is closed when photographic paper is loaded; (e) detects shrinkage of paper loops accumulated in the feed accumulator section; (f) A loop detection sensor that controls the paper feeding section so that a certain amount of photographic paper is accumulated in the feeding accumulator section; (g) A detection sensor that detects the leading edge of photographic paper when it is loaded downstream of the paper feed unit, and (h) A signal from the detection sensor that stops the paper feed unit and moves the guide plate. control means for opening the photographic paper and reversing the paper feeding section to transport the photographic paper in the opposite direction until the leading edge of the photographic paper is positioned immediately behind the paper transporting section; An automatic photo printing device characterized in that a paper loop is formed in a feeding accumulator section.