JPS638742A - Photosensitive material guide structure for developing device - Google Patents

Abstract

PURPOSE:To prevent dirt in both side parts in the breadthwide direction of a photosensitive material by forming plural pairs of non-clipping parts corresponding to both side parts of photosensitive material which are carried by pairs of rolls and are different in breadthwise dimensions on the pairs of rolls. CONSTITUTION:After the carrying direction of a photographic paper 14 whose printing work is terminated is changed by a guide 1, and photographic paper is sent out between feed rolls 28A and 30A through guide plates 34 and 36 and has both side parts swollen with a developer, and these swollen parts correspond to small-diameter parts 48 or 50 and do not receive the clipping force when the photographic paper 14 passes between feed rolls 28C and 30C. As the result, overdevelopment in both side parts in the breadthwise direction of the photographic paper 14 is prevented, and the photographic paper is correctly developed and is sent to the next pair of rolls. Since both end parts in the breadthwise direction of the photographic paper 14 correspond to small-diameter parts 48 or 50 until the photographic paper 14 reaches the next processing tank after inversion, the developer is not infiltrated to prevent the photographic paper 14 from being yellowish and being dirty in end parts.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a photosensitive material guiding structure for a developing device that is used in a developing device for exposed photosensitive materials and guides the photosensitive material within the developing device.

[Background technology and matters to be solved]

Photographic paper, which is an example of a photosensitive material, is sent to a developing device after an image is exposed to light.

In this developing device, photographic paper is sent between multiple pairs of feed rollers, developed while being immersed in processing liquid, and then sent to the next process. In the guide structure? The photographic paper is sequentially fed between jj pairs of rollers, and the photographic paper is brought into contact with a developer between these rollers and subjected to development processing.

However, since both sides of the photographic paper being fed tend to contain the developer, these sides are more likely to swell than the center in the width direction. Furthermore, when these swollen sides, that is, the ears, are fed while being held between rollers, they are subjected to greater pressure than the center in the width direction, causing more developer to seep in, resulting in deterioration and yellowing and other stains on the ears. becomes.

The present invention has been made in consideration of the above-mentioned facts, and an object of the present invention is to provide a photosensitive material guide structure for a developing device that does not cause deterioration in quality due to liquid seepage on both sides of the photosensitive material that is fed between a plurality of pairs of rollers.

[Summary and operation of the invention]

The present invention is a photosensitive material guiding structure for a developing device, which is equipped with at least a pair of feed rollers that feed out a photosensitive material while nipping it, and each of the pair of rollers corresponds to each side of the photosensitive material having a different width dimension to be conveyed. It is characterized in that a plurality of pairs of non-pinching parts are formed.

Therefore, in the present invention, when photosensitive materials with different width dimensions are fed between the rollers, the non-clamping portions corresponding to both sides of the photosensitive materials in the width direction do not pinch both sides of the photosensitive materials. Therefore, the both sides in the width direction, which swell with the developer, do not change in quality.

The non-nipping portion may be formed by forming a groove or the like on only one of the pair of rollers that sandwich the photosensitive material, or may be provided on both rollers. Alternatively, a non-nipping portion for a narrow photosensitive material may be provided on one roller, and a non-nipping portion for a wide photosensitive material may be provided on the other roller.

Furthermore, this non-nipping section can be made into a non-nipping section by shortening the axial dimension of one of the rollers to provide a portion that does not come into contact with both ends of the photosensitive material. In this case, the other roller naturally has an axial length larger than the width of the photosensitive material.

In the case where a plurality of roller pairs for guiding the photosensitive material are provided, non-nipping portions may be formed in the roller pairs in the second and subsequent stages among these roller pairs. In other words, when a photosensitive material is immersed into a developing device and progresses, the developer soaks into both ends in the width direction after a while after entering the developer, so the initial stage where no uneven development occurs until both sides swell. In order to make the development process uniform, it is sufficient to feed the sheet under the same conveyance conditions as the central portion in the width direction, and after both sides in the width direction have swelled, the non-nipping portion may be adjusted to prevent staining due to liquid seepage.

[Embodiment of the Invention] FIGS. 1 to 3 show a configuration in which this embodiment is applied to a rack means 12 immersed in a developer in a developing device 1°. That is, in this developing device 10, photographic paper 14, which is a photosensitive material that has been exposed to light by the printer, is fed in while being guided by a temporary bending guide 15.
After being guided into the developing tank 16 and immersed, it is turned back into a U-shape and pulled out, and after tracing an inverted U-shaped trajectory, it is sent out to the next processing tank 18.

As shown in FIG. 2, in the rack means 12, a plurality of support rods 22 are hung between a pair of opposing side plates 20.21, and nuts 24 are attached to the tips of the support rods 22 protruding from the side plates 20.21. By being screwed together, the pair of side plates 20 and 21 are fixed to each other at a predetermined interval.

A feed roller 28 is pivotally supported near the upper ends of the side plates 20, 21 at the center in the width direction. Feed rollers 30, 32 are pivotally supported adjacent to this feed roller 28, and each abuts the feed roller 28 from the opposite side of the feed roller 28. These feed rollers 30, 32 are the feed rollers 28
It is smaller in diameter than the

Immediately below the feed roller 28 are feed rollers 28A, 28B,
28C128D are pivotally supported on the side plates 20.21 at equal intervals, and feed rollers 30A, 30B, 30
C, 30D are directly below the feed roller 30, and the feed roller 32
A, 32B, and 32C132D are respectively disposed directly below the feed white roller 32 and are pivotally supported to the side plates 20.21.

The straight line connecting the axes of the feed rollers 28A to 28D is the photographic paper 1.
4 (direction of arrow A).

It is sent out from between the feed rollers 28 and 30 and sent to the feed roller 2.
In order to move the photographic paper 14 between 8A and 30A into the room, U-shaped guide members 34 and 36 are attached to the side plates 20 and 21, respectively.
installed to.

The space between the guide members 34 and 36 is a passage for the developer, so that the developer can effectively contact the photographic paper 14 being conveyed.

Similar guide members 34, 36 are provided on the transport path between each roller to guide the photographic paper.

The feed rollers 30 to 30D are arranged with their axes slightly lower than the feed rollers 28 to 28D, and conversely, the feed rollers 32 to 32D are arranged at a position slightly lower than the feed rollers 28 to 28D.
The axis is located slightly above 8-28D. Below the feed roller 28D is a folding roller 44.
is provided and is in contact with the feed roller 28D.

This folding roller 44° and feed rollers 30D and 32D
A folding guide plate 45 is arranged between the conveyed photographic paper 14 over the entire width direction of the locus, and both ends are connected to the side plate 2.
The hook extends over 0.21 mm and has an arc shape when viewed from the axial direction of the folding roller 44.

As shown in FIG. 3, the feed rollers 30C and 32G that come into contact with the feed roller 28C are each formed with a pair of stepped small diameter portions 48, 50 at their axial intermediate portions. These small diameter portions 48, 50 correspond to both sides in the width direction of the photographic paper being conveyed. - That is, the width of the small diameter portion 48 is S.
, the small diameter portion 50 corresponds to photographic paper with a width dimension of M, and when the photographic paper is held between the feed roller 28C and the feed roller 28C, a non-nipping portion is formed between the feed roller 28C and the width of the photographic paper. Both sides in the direction are not pinched.

Such small diameter portions 48.50 are the feed rollers 30C, 32.
The feed rollers 30D, 32D and the folding roller 44 disposed below C are similarly formed. This effectively prevents staining of the photographic paper 14. That is, the photographic paper 14 is transported by the feed rollers 28, 30, . After passing the feed rollers 28A, 30A and the feed rollers 28B, 30B, the passage time in the developer tank 16 becomes longer, so a swollen portion absorbing the developer is formed near both measuring portions. If this swollen part is held under a large pressure like the widthwise center part, compression and swelling will be repeated, and the developer will soak in, causing stains. To prevent this, small diameter portions 48,50 are provided to allow the photographic paper to be fed without the developer seeping into the edges of the photographic paper.

In addition, feed roller 28 to feed roller 28B1 feed roller 3
Although the feed roller 30B is not provided with a small diameter portion, the feed rollers 32B, 32A, and 32 are similarly provided with small diameter portions to weaken the clamping force at both ends of the photographic paper.

One end of the feed roller 28 to feed roller 28D protrudes from the side plate 21 and has a gear 52 fixed thereto (FIG. 1 representatively shows only the gear 52 corresponding to the feed roller 28). A chain (not shown) is connected to these gears so as to rotate the feed rollers 28 to 28D at the same rotation speed. Further, a gear 54 is fixed to the end of the feed roller 28 protruding from the side plate 20.
Gears (not shown) rotated by a drive device (not shown) mesh with each other. This gear 54 meshes with a gear 56.58 which is fixed to the end of the feed roller 30.32 and rotates the feed roller 30.32 at the same rotational speed as the feed roller 28 in the opposite direction. .

These gears 54, 56, 58 are also fixed to the feed rollers provided below the feed rollers 28, 30, 32, respectively, and similarly, the three groups of feed rollers that are in contact with each other rotate at the same rotational speed and in opposite directions. It is rotated in the direction.

In this way, the feed rollers 28 to 28D and the feed rollers 30 to
32D, the photographic paper 14 is conveyed downward in the direction of arrow A within the developer tank, and between the feed rollers 30D and 32D, it is reversed by being held between the feed roller 28D and the folding roller 44, and the photographic paper 14 is conveyed downward in the direction of arrow A in the developing tank. Feed rollers 32-32
Due to the interlocking movement with the above, it receives a driving force for transporting the paper upward in the direction of arrow B.

The three feed rollers in contact with each other are arranged on the side plates 20, 21 in such a way that the feed rollers on both sides are constantly in contact with the central feed roller - for example feed rollers 30 and 32 with the feed roller 28. The feed roller 3 formed in
A shaft support through hole of 0.32 mm is a long hole 60, and the feed rollers 30 and 32 receive force in the direction of approaching the feed port 28 by an endless tension spring ring 62.

Further, at the upper part of the rack means 12, a photographic paper 14 is placed in a processing tank 18.
A bracket 64 is attached to the bracket 64 for feeding the feed, and a substantially semicircular bending guide plate 66 is provided on the bracket 64, and a pair of feed rollers 68, 70 are provided in the middle of the bending guide plate 66. The photographic paper 14 being sent out is pinched and conveyed and folded back into an inverted U shape.

Next, the operation of this embodiment will be explained.

After the printing process has been completed, the photographic paper 14 is conveyed in a different direction by the guide 15, and then sent between the feed rollers 28 and 30. The feed roller 28 rotates counterclockwise in FIG. 1, and the feed roller 30 rotates clockwise. It sends out between 30A and 30A.

In this way, the photographic paper 14 is moved between the feed rollers 28, 30,
Between feed rollers 28A and 30A, feed rollers 28B and 30
When the film passes between B, its both sides gradually swell with the developer. Therefore, when passing between the feed rollers 28C and 130C, this swollen portion corresponds to the small diameter portion 4 or 50 and is not subjected to any clamping force. As a result, there is no overdevelopment occurring on both sides of the photographic paper 14 in the width direction, and the photographic paper 14 is properly developed and sent to the next pair of rollers.

Furthermore, the photographic paper 14 is fed by a feed roller 28D and a feed roller 30.
D, between the feed roller 28D and the folding roller 44, between the feed roller 28D and the feed roller 32D, and then between the feed roller 28 and the feed roller 32. It is sent out to the next processing tank. After being reversed in this manner, both ends in the width direction of the photographic paper 14 are formed into a small diameter portion 48 or a small diameter portion 5, respectively, while going to the next processing tank.
Since it corresponds to 0, the developer does not seep in, and yellowing and staining are prevented.

When photographic paper 14 of different dimensions is conveyed, the intervals S and M of the small diameter portion shown in FIG. 3 are adjusted according to these dimensions.
It is only necessary to prepare a roller whose diameter is adjusted, and in order to cope with a large number of width dimensions, it is sufficient to have a large number of stages of these small diameter portions. For this purpose, a plurality of rings having outer diameters corresponding to the large diameter portion and the small diameter portion may be alternately fitted onto the outer periphery of the shaft.

FIG. 4 shows a modification of the non-clamping part.

In this embodiment, the axial lengths of the feed rollers 32C and 30C are formed shorter than the axial length of the feed roller 28C, so that the vicinity of both axial ends of the feed roller 28C do not correspond to the feed rollers 32C and 30C. First, a non-nipping section is formed that does not nip both sides of the photographic paper having a width of L.

Further, in this embodiment, the small diameter portion 50 corresponding to the photographic paper having the width dimension M is not the feed roller 32C and the feed roller 30C,
It is formed on the feed roller 28C.

Incidentally, a small diameter section similar to the small diameter section 48, 50 may be provided on the opposite side of the photographic paper to be held so that neither the front nor the back of both sides of the photographic paper come into contact with the roller.

〔Effect of the invention〕

As described above, the present invention provides a photosensitive material guiding structure for a developing device, which is equipped with at least one pair of feed rollers that feed out the photosensitive material while nipping the photosensitive material therein. Since it is characterized in that a plurality of pairs of non-clamping parts corresponding to the respective parts are formed, it has an excellent effect of preventing staining on both sides of the irradiating material in the width direction.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of a rack means showing an embodiment of the photosensitive material guide structure for a developing device according to the present invention, FIG. 2 is an exploded perspective view, and FIG. FIG. 4 is a plan view showing the correspondence of the feed rollers according to the second embodiment. 10... Developing device, 12... Rack means, 14... Photographic paper, 28. 28A, 28B, 28C, 28D... Feed roller, 30. 30A, 30B, 30C, 30D... Feed roller , 32.32A, 32B, 32C, 32D...Feed roller, 48...Small diameter portion, 50...Small diameter portion.

Claims (3)

[Claims] (1) A photosensitive material guide structure for a developing device, which is equipped with at least a pair of feed rollers that feed the photosensitive material while nipping it, and each of the pair of rollers has rollers corresponding to both sides of the photosensitive material having different width dimensions to be conveyed. A photosensitive material guide structure for a developing device, characterized in that a plurality of pairs of non-nipping portions are formed. (2) The photosensitive material guide structure for a developing device according to claim (1), wherein the non-nipping portion is a small diameter portion formed at an axially intermediate portion of the roller. (3) The above-mentioned patent characterized in that the axial dimension of the one roller is shortened so that it is arranged so as not to come into contact with both sides of the photosensitive material, thereby forming one pair of the plurality of pairs of non-clamping parts. A photosensitive material guide structure for a developing device according to claim (1).