JP2001142190A - Photographic printing and developing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To develop a switch-back type transporting device which occupies a smaller space, is low in cost and is high in reliability in a changeover guide mechanism of a photographic printing and developing device. SOLUTION: This photographic printing and developing device has the switch- back type transporting device which grasps photosensitive material with forward and backward rotatable changeover guide machines and changes the transporting direction of photosensitive materials by switching of the forward and backward revolutions of these rollers and changeover guide. The switch-back type transporting device described above consists of a drive roller, transfer-in side pressure contact roller, ejection side pressure contact roller, stationary type changeover guide and transporting path guide. The drive roller and the ejection side pressure contact roller are so arranged to the pointed end of the stationary type changeover guide that the contact planes of the contact parts of the drive roller and the ejection side pressure contact roller part from the pointed end of the stationary type changeover guide.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a photographic printing / developing apparatus having a switchback type transport device. More specifically, the present invention relates to a transport path switching mechanism of a switchback type transport device.

[0002]

2. Description of the Related Art An automatic photographic printing / developing apparatus has a mechanism in which development processing and finishing are completed when a photosensitive material is sequentially passed through an exposure section, respective processing solution tanks, a drying section and the like by a transport device. FIG. 1 is a structural view of a printing and developing device. The paper magazine 901 contains a roll of photographic paper P. The roll-shaped photographic paper P is cut by the cutter 902 into a size according to the customer's order, transported to the exposure table 904, and
03 is printed from the film and passes through the transport path to the developing device 90
Transported to 5. The photographic paper P exposed by the developing device 905 is developed,
After being bleach-fixed, washed and dried, they are stacked on a stacker 906. A transport device constitutes a transport path of photographic paper between or within the devices, and the transport device is configured by devices such as rollers, belts, guides, and motors. Computers and various sensors control these components.

[0003] The switch-back type transport device 1 includes a photographic paper P
It is used as a transport device for changing the traveling direction of the paper, turning the front and back, or as a photographic paper transport device. For example, a developing device
Based on the specifications of 905 and the like, in order to transfer the emulsion surface and the base surface of the photographic paper P after printing, a switchback type transport device 1 is disposed between the exposure device 903 and the developing device 905 as shown in FIG. Is provided. FIG. 2 shows the structure of the switchback type transport apparatus 1. The drive roller 110 is configured to rotate by a drive motor (not shown).
It serves to send photographic paper P. To ensure that the photographic paper P can be transported, the pressure rollers 160a and 160b
Closely adhered to. A feature of the switchback transport device 1 is that the traveling direction of the printing paper P can be reliably changed by changing the rotation direction of the drive roller 110. A switch guide 120 is attached to the switchback type transport device 1 so that the photographic paper can be reliably fed.
The structure is shown in FIG. This device has a shaft
Rotating around 124, switching guide 120 and drive roller 11
The travel direction of the photographic paper P is controlled by creating a gap between them and zero or closing the gap. The motor 127 drives the switching guide 120 to open and close the gap.
The determination as to whether the photographic paper P has completely passed between the drive roller 110 and the switching guide 120 is made based on the detection signal from the photographic paper detection sensor 2 and the drive roller 11.
The control of the drive motor of 0 and the switching guide drive means is performed.
The position of the switching guide 120 is detected by a position detection plate 129a and a position detection sensor 129b.

When the center point O of the drive roller 110, the center point Oa of the press roller 160a, and the center point Ob of the press roller 160b, the press roller 160a and the press roller 160a are so formed that the angle between the straight line OOa and the straight line OOb is a right angle. 160b is arranged to be pressed against the driving roller. This is photographic paper P
To change the transport direction of the
The leading end of the photographic paper P that has passed through 0
This is to enable the pinching.

FIG. 3 illustrates the direction of rotation of the drive roller and the direction of movement of the photographic paper. When the leading edge of the printing paper P is detected by the printing paper detection sensor 2, the switching guide 120 is opened (separated from the driving roller 110), and the driving roller 110 is rotated clockwise.
When the driving roller 110 is rotating clockwise, the printing paper P passes between the switching guide 120 while being sandwiched between the driving roller 110 and the pressure roller 160a.
After passing through 20, the printing paper P moves further while being sandwiched between the driving roller 110 and the pressure roller 160b. Photographic paper P
When the rear end completely passes through the switching guide 120, the rotation of the drive roller 110 stops, and the printing paper stops while being sandwiched between the drive roller 110 and the pressure roller 160b (see (1) in FIG. 3).

Subsequently, the driving roller 110 is rotated in the reverse direction, the switching guide 120 is closed (closely contacted with the driving roller 110), and the printing paper P is conveyed to the switching guide 120 while being sandwiched between the driving roller 110 and the pressure roller 160b. It passes between the road guides 128 (see (2) (2a) in FIG. 3). If the switching guide 120 and the drive roller 110 are incompletely closed, the leading end of the photographic paper P collides with the pointed end of the switching guide, and the leading end of the photographic paper is damaged, thereby deteriorating print quality or causing paper jams. This causes a problem (see (2) and (2b) in FIG. 3).

[0007]

As has been seen in the prior art, the conventional switchback type transfer apparatus has used a drive means such as a dedicated motor or a solenoid as the power for the switching guide. In addition, since a dedicated driving unit is used, a position detection sensor for a dedicated switching guide is required. This not only increases the cost, but also requires a space for attaching a switching mechanism (devices such as a driving unit and a detector).

If the switching guide is closed improperly or the edge of the switching guide slightly projects when the switchback is performed, the leading end of the photographic paper (the rear end as viewed from the direction at the time of carrying in) is brought into contact with the switching guide. Touching the sharp edge may damage the photographic paper or cause paper jams.

According to the present invention, a switching back mechanism for a photographic printing / developing apparatus is developed, which is a switchback type conveying apparatus which is space-saving, low-cost and highly reliable, and thereby realizes a cheaper and higher-performance automatic photographic printing / developing apparatus. Aim.

[0010]

In order to solve the above-mentioned problems, a photosensitive material is sandwiched between rollers capable of rotating forward and backward,
In a photographic printing / developing apparatus provided with a switchback type transport device that changes the transport direction of the photosensitive material by switching between forward and reverse rotation of the roller and a switching guide, a driving roller, a loading pressure roller, an unloading pressure roller, and a fixed type switching device. A switch-back type transport device comprising a guide and a transport path guide, wherein a tangent plane of a contact portion between the driving roller and the unloading side pressure roller is a point of the fixed type switching guide with respect to a point of the fixed type switching guide. A switchback type transport device in which the drive roller and the unloading side pressure roller are arranged so as to be separated from the unit.

The angle at which the tangent plane of the contact portion between the driving roller and the discharge side pressure roller is separated from the point of the fixed switching guide is too small or too large. In the range of approximately 10 to 15 degrees, appropriate performance can be obtained.

In the present invention, the structure of the conventional movable switching guide is eliminated and a fixed switching guide is used. However, if the switching guide is fixed, the gap between the driving roller through which the printing paper passes and the switching guide must be kept open.
This risks even more paper jams. Depending on the degree of curl of the photographic paper, the photographic paper returns to the original transport path and does not serve as a switchback.

In a photographic printing / developing apparatus for exposing and developing a photosensitive material, the switchback type transport device is constituted by a drive roller, a pressure roller a, a pressure roller b, a fixed switching guide, and a transport path guide.
When the direction is changed, a line la connecting the center point of the drive roller and the center point of the pressure roller a and a line lb connecting the center point of the drive roller and the center point of the pressure roller b are expressed as l
The pressure roller a and the pressure roller b are arranged so as to be pressed against the drive roller so that the angle between a and lb is in the range of 100 to 105 degrees. By setting the arrangement angle of the pressure roller a and the pressure roller b as described above, at the time of switchback, the unloading direction by the drive roller and the pressure roller b does not move in a direction perpendicular to the loading direction, but rather than that. Since the printing paper advances in the opening direction, that is, in the direction slightly away from the tip of the fixed switching guide, the leading end of the printing paper does not hit the tip of the switching guide,
It is possible to provide a structure in which the edges of the photographic paper are not easily damaged or paper jams occur.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described with reference to the drawings. FIG. 4 is a diagram showing the structure of a switchback type transport apparatus using the fixed switching guide of the present invention. The symbols in the figure have the following meanings. O is a center point of the drive roller 110, Oa is a center point of the pressure roller a (160a), Ob is a center point of the pressure roller b (160b), d1 and d2 are rotation directions of the drive roller 110, and d3 is photographic paper. The carry-in direction of P and d4 represent the carry-out direction. 1 represents a horizontal straight line passing through the center point O of the driving roller 110, and θ represents an angle formed between the straight line l and the straight line OOb.

In the conventional apparatus, the pressure roller b is disposed in the direction of the straight line l. In the present invention, however, the drive roller 110 is positioned at an angle θ (= 10 ° to 15 °) lower than the straight line l. Is installed in the form of crimping. That is, while the angle between the straight line OOa and the straight line OOb is 90 degrees in the related art, it is 90 + θ degrees in the present invention.
Further, the switching guide 120f is fixedly installed with a gap formed between the switching guide 120f and the driving roller 110. Therefore, in the present invention, the switching guide 120f is referred to as a "fixed switching guide" (however, it is simply described as a "switching guide" unless otherwise distinguished in this document) with respect to the conventional movable switching guide.

The drive roller 110 rotates clockwise (rotation in the direction d1), rotates counterclockwise (rotation in the direction d2), and stops in the same manner as in the above-described prior art.
(Not shown in the figure) is controlled by a computer. When the photographic paper P is carried in from the d3 direction, the drive roller 110 rotates clockwise and the pressure roller a
The photographic paper P is guided into the gap of the switching guide 120f while being sandwiched between (160a). When the leading end of the photographic paper P passes through the switching guide 120f, the photographic paper P moves while being nipped by the drive roller 110 and the pressure roller b (160b), and the rear end of the photographic paper P is driven by the drive roller and the pressure roller b (160b). The rotation stops when it reaches the contact point of (), and stops while being held by both rollers. Next, the driving roller 110 is rotated in the reverse direction (left rotation, d
The photographic paper P is switched back to 90
It proceeds in the direction of + °, but in a direction (d4 direction) perpendicular to the original direction by the switching guide and the conveyance path guide 128. This will be described in more detail with reference to FIG.

FIG. 5 shows a photographic paper P which is advanced by switching back.
The direction of is shown. If the pressure roller b (1
If 60b) is on the straight line l, the printing paper P advances straight up along the switching guide 120f. However, in the present invention, since the pressure roller b (160b) is installed at a position lowered by θ degrees from the straight line l as shown in the figure, the printing paper P advances in a direction farther than the switching guide 120f, that is, in the direction d2. More precisely, the printing paper P is directed in a direction away from the side surface of the switching guide 120f by an angle θ. However, because of the provision of the transport path guide (omitted in FIG. 5, see 128 in FIG. 4), the photographic paper P advances in the d1 direction along the transport path guide, and the photographic paper P is attached to the tip of the switching guide 120f. The front end (the rear end when viewed from the carrying direction) does not hit, so that paper jam does not occur.

FIG. 6 is a perspective view of the fixed switching guide. The switching guide 120f is fixed to the unit side plate 121f attached to the transport device by fixing with a fixing screw 122f. That is, the switching guide of the present invention is fixed, the switching guide is not opened and closed, and the transport of the photographic paper and the switchback are controlled only by the operation timing of the driving roller.

[0019]

According to the conventional switching guide, the carrying-out direction of the photographic paper is controlled by opening and closing the switching guide. For this reason,
A motor for opening and closing the switching guide and a position detector for the switching guide were required. On the other hand, in the present invention, the mounting direction of the printing paper is changed by shifting the mounting position of the pressure roller, so that the leading end (the rear end when viewed from the loading direction) of the printing paper does not hit the sharp end of the switching guide. This makes it possible to change the transport direction of photographic paper without causing a paper jam. This makes it possible to replace the conventional movable switching guide with a fixed switching guide. In the fixed type, the word "switch guide" is not correct, and can be considered to be exactly the same as a mere transport path guide, and a transport path guide may be more accurate. However, in the present invention, the term "switching guide" has been used to correspond to the conventional concept.

By fixing the switching guide, the following effects can be obtained. The fact that the switching guide is unnecessary means that the switching guide mechanism is unnecessary, and the switching guide can be treated as a mere conveyance path guide without requiring a complicated mechanism or a plurality of mechanical devices. Specifically, there is no need for a guide switching opening / closing motor and a position detector, which are conventional devices for the switching mechanism of the switching guide, so that the cost of these devices and the space for storing the devices can be reduced. by this,
It is possible to develop a small-sized device at low cost. -Since no complicated mechanism is required, the number of failures is small, and the reliability of the device is increased. In the present invention, the pressure roller b on the carry-out side is shifted in the range of an angle of approximately 10 ° to 15 ° as compared with the conventional case, but this numerical value is an angle that does not cause a paper jam and enables smooth carry-out. . The reason is as follows. If this angle is too large, the photographic paper will curl,
In addition to causing a paper jam, the pressure roller b on the carry-out side cannot reliably pinch the leading end of the carried-in photographic paper, which also causes a paper jam. Conversely, if the angle is too small, the direction in which the photographic paper is carried out is not so different from the conventional direction, and the effects of the present invention cannot be obtained. Within the range of the angle claimed by the present invention, not only ordinary photographic paper but also curled paper can be reliably carried out.

[Brief description of the drawings]

FIG. 1 is a perspective view and a side view showing the structure of a conventional automatic photographic printing and developing apparatus.

FIG. 2 is a structural view of a conventional switchback type transport device.

FIG. 3 is a diagram for explaining a paper conveyance state when a conventional switchback type conveyance device is used.

FIG. 4 is a view for explaining the structure of a fixed switching guide of the present invention.

FIG. 5 is a view for explaining a paper transport direction by the fixed switching guide of the present invention.

FIG. 6 is a perspective view showing a fixed switching guide mounting of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Switchback type conveyance apparatus 2 Photographic paper detection sensor 110 Drive roller 120 Switching guide (movable switching guide) 124 Axis 127 Motor (switching guide opening / closing motor) 128 Guide (conveyance path guide) 129a Position detection plate 129b Position detection sensor 120f Switching Guide (fixed switching guide) 121f Unit side plate 122f Fixing screw 160 Crimping roller 160a Crimping roller a 160b Crimping roller b 9 Automatic photo printing and developing device 901 Paper magazine 902 Cutter 903 Exposure unit (exposure device) 904 Exposure table 905 Developing unit (Developing) Device) 906 Stacker O Center point of driving roller Oa Center point of pressing roller a Ob Center point of pressing roller b P Photosensitive material (photographic paper, paper) d1 to d4 Moving direction, rotating direction (use with arrow) l linear θ angle OaOOb representing the horizontal direction (angle line l and the line OOb forms)

Claims (2)

[Claims] 1. A photographic printing / developing apparatus comprising a switchback type transport device which sandwiches a photosensitive material with a forward / reverse rotatable roller and changes the transport direction of the photosensitive material by switching between forward / reverse rotation of the roller and a switching guide. An apparatus, comprising: a switchback-type transport device including a driving roller, a loading-side pressure roller, an unloading-side pressure roller, a fixed switching guide, and a transport path guide, wherein the drive roller is disposed at a point of the fixed switching guide. Wherein the drive roller and the discharge-side pressure roller are arranged so that the contact plane of the contact portion of the discharge-side pressure roller and the contact portion of the fixed-type switching guide is separated from each other. apparatus. 2. A photographic printing / developing system comprising a switchback type transport mechanism for nipping a photosensitive material between rollers capable of rotating forward and reverse and switching the direction of transport of the photosensitive material by switching between forward and reverse rotation of the roller and a switching guide. An apparatus, comprising: a switchback-type transport device including a driving roller, a loading-side pressure roller, an unloading-side pressure roller, a fixed switching guide, and a transport path guide, wherein the drive roller is disposed at a point of the fixed switching guide. A switch wherein the drive roller and the discharge-side pressure roller are arranged such that a tangent plane of a contact portion between the discharge roller and the discharge-side pressure roller is separated from the point of the fixed switching guide by an angle of approximately 10 to 15 degrees. A photographic printing / developing device having a back-type transport device.