JPH0119135Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a belt-shaped sheet conveyance mechanism, and more specifically, the invention transports a photographic paper guide clip, which is locked to the leading end of a belt-shaped photographic paper on which an image has been printed, to a developing tank together with the photographic paper. Regarding the conveyance mechanism.

Conventionally, while printing a print onto a strip of photographic paper, the printed part was sent to the developing device.
There is a method in which the photographic paper is conveyed as a strip of photographic paper between intermittent printing and continuous development. According to this method, the leading end of a band-shaped photographic paper on which an image has been printed is latched to a leading member such as a clip that engages with a chain conveyance means, and the paper is conveyed into a developing tank. Normally, the developing device is fixed at a fixed position, but if necessary,
On the printing section side, to adjust the distance between the light source and the printing table,
It may be installed so that it can move up and down. As the printing section moves up and down, the distance between the print printing section and the developing device naturally changes. Therefore, a belt-shaped sheet conveyance path that allows the chain conveyance path to expand and contract in response to changes in the distance therebetween is required. It was wanted.

An object of the present invention is to provide a belt-shaped sheet conveyance mechanism that can meet such demands. That is, the present invention connects the printing section on the movable side and the developing section on the fixed side, and provides an expansion and contraction mechanism for a circulating conveyance means such as a chain or belt that conveys the strip of photographic paper to the developing section.

The belt-shaped sheet conveying mechanism according to the present invention includes a pair of opposing chains, belts, or other circulation conveying means, and each chain or belt is installed between a sprocket on the printing section side and a sprocket on the developing section side. The chain or belt is endless, and its total length is sufficient to accommodate changes in the conveyance distance, and slack and tension in the chain or belt due to changes in the distance are absorbed or adjusted by tension adjustment rollers. A divided guide plate is provided on the outside of the chain or belt, one guide plate is pivoted on the printing section side, the other guide plate is pivoted on the developing section side, and the other guide plate is pivoted on the printing section side. The structure is such that it can follow changes in the inclination of the chain or belt conveyance path in response to vertical movement. Guide grooves are formed on the inner surfaces of both guide plates in parallel to the conveyance direction, and slide and support the lower surfaces of both ends of the photographic paper guide clip that engage with the chain or belt groove. A sliding plate is installed between each guide plate. That is, when the length of the conveyance path increases due to the vertical movement of the printing side, the sliding plate, which is biased downward by the spring, enters between the two protective plates, fills the space between the two protective plates, and Prevents both ends of the guide clip from falling off the chain or belt.

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a schematic diagram showing a photographic printing processing apparatus incorporating a belt-shaped sheet conveying mechanism according to the present invention.

The strip-shaped photographic paper 1 is conveyed in a light-shielded space in the order of a printing section 2, a cutting section 3, a clip mounting section 4, a chain conveying section 5, and a developing section 6. Burning part 2, cutting part 3,
The clip mounting section 4 can be moved up and down integrally as surrounded by a solid line, and the printing size can be varied by adjusting the distance between the light source 7 and the printing table 8. The strip-shaped photographic paper 1 wound around a spool 9 is guided onto a printing table 8 via a tension roller 10, and is conveyed while being held between a feed roller 11 and a press roller 12. The cutting section 3 cuts the leading edge of the strip-shaped photographic paper and forms a through hole in the leading edge of the photographic paper that engages with the photographic paper guide clip 13. Further, the cutting section 3 cuts the trailing end of the strip-shaped photographic paper when printing is completed. In the clip mounting section 4, the leading end of the strip of photographic paper 1 conveyed by the feed roller engages with the photographic paper guide clip 13 guided to the engagement position by the clip guiding means 14. The guide clip 13 engages with a pair of opposing chains 17 driven by sprockets 15 and 16, and guides the strip of photographic paper as it is conveyed. When the photographic paper guide clip 13 reaches the developing section 6, it is guided into the developer tank via the delivery member 18, and the subsequent strip-shaped photographic paper 1 is developed.

FIG. 2 is a perspective view showing a state in which the photographic paper guide clip used in the present invention is engaged with a chain conveyance means to convey a strip of photographic paper.

The photographic paper guide clip 13 includes a rigid rod-shaped portion 19 and a locking portion 2 made of an elastic material such as resin.
0 are integrated with each other, and both ends of the rod-shaped portion 19 can be set in grooves 17' of a pair of opposing chains 17. The locking portion 20 has an engaging claw 21, an upturned portion 22, a downturned portion 23, and a central locking portion 24 extending in a direction opposite to the conveyance direction A. That is, the leading edge of the strip-shaped photographic paper 1 is inserted between the upturned part 22 and the downturned part 23, and the perforation 25 formed at the leading end of the photographic paper is inserted between the upturned part 22 and the downturned part 23.
However, by engaging with the engaging claw 21, the strip-shaped photographic paper 1 and the photographic paper guide clip 13 are engaged with each other.

FIG. 3A is a plan view of the belt-shaped sheet conveyance mechanism in the chain conveyance section 5 of the present invention, and FIG. 3B is a side view thereof.

As mentioned above, since the photographic paper guide clip guiding means 14 is movable up and down integrally with the printing section 2, when the developing section 6 on the fixed side is used as a reference,
As the guide means 14 moves up and down, the chain conveyance distance d changes. The rotating shaft 26 of the sprocket 16 on the entrance side of the developing section, which drives the chain 17, is always provided at a predetermined position. On the outside of the pair of chains 17, a guide plate 27 that is pivotally supported by the developing section 6 is disposed in parallel, and its inner surface has a guide groove that slides and supports the lower surface of the rod-shaped portion 19 of the photographic paper guide clip 13. 28 is formed. The inclination of the guide plate 27 can follow the inclination of the chain 17 as the guiding means 14 moves up and down, and the inclination angle is regulated by the arcuate slot 29. A recess 30 is formed on the outer surface of the guide plate 27, and an end surface of the recess 30 on the developing section side provides an inclined guide surface 31. A sliding plate 32 is disposed within the recess 30 and is guided by a guide surface 31 to be able to move up and down. A pin 33 is implanted in the sliding plate 32, and a spring 35 is provided between the pin 33 and a pin 34 implanted in the guide plate 27, so that the sliding plate 32 is always urged downward.

The end surface of the guide plate 27 on the printing device side is a guide plate 3 that moves following the vertical movement of the clip guiding means 14.
6, and the end surface of the guide plate 36 on the developing section side is in sliding contact with the sliding plate 32. Information board 36
A guide groove 2 formed in the guide plate 27 is formed on the inner surface of the guide plate 27.
A guide groove 37 is formed on the same straight line as the chain groove 17', and slides and guides the lower surface of the rod-shaped portion 19 being conveyed by engaging with the chain groove 17'.

From the inner surface of the guide plates 27, 36, the columns 38, 3
9 extends to support band-shaped photographic paper support members 40 and 41. The support column 39 further pivotally supports one end of the swing plate 42. The other end of the swing plate 42 rotatably supports a tension adjustment roller 43. The tension adjustment roller 43 always urges the chain 17 to prevent it from sagging, and for this purpose,
The swing plate 42 is biased by a spring 44.

In order to adjust the print size, by changing the distance between the light source 7 and the printing table 8, when the photographic paper guide clip guide means 14, which moves up and down integrally with the printing device, moves up and down, the chain transport The distance d changes. That is, when the distance d increases, the distance between the end faces of the guide plates 27 and 36 increases, but the sliding plate 32 moves closer to the recess 3 in accordance with the increase.
0 to fill the space, and the rod-shaped portion 19 of the photographic paper guide clip 13 is inserted into the chain groove 17'.
prevent it from falling off. In response to a change in distance d, the swing plate 42 swings about the support 39 as a fulcrum, and changes the height of the tension adjustment roller 43 to keep the tension of the chain 17 constant.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of a photographic printing apparatus incorporating a belt-shaped sheet conveyance mechanism according to the present invention, and FIG. 2 shows a photographic paper guide clip used in the present invention engaged with a chain conveyance means to print a belt-shaped print. FIG. 3A is a perspective view showing a state in which paper is being conveyed, and FIG. 3A is a plan view of the belt-shaped sheet conveyance mechanism in the chain conveyance section of the present invention, and FIG. 3B is a side view thereof. DESCRIPTION OF SYMBOLS 1... Band-shaped photographic paper, 2... Printing section, 3... Cutting section, 4... Clip mounting section, 5... Chain conveying section, 6... Developing section, 7... Light source, 8... Printing table,
9...Spool, 10...Tension roller, 1
1...Feed roller, 12...Press roller,
13... Photographic paper guide clip, 14... Clip guiding means, 15, 16... Sprocket, 17
...Chain, 18...Delivery member, 19...
Rod-shaped part, 20... Locking part, 21... Engaging claw, 22
... Vertical part, 23 ... Vertical part, 24 ... Central locking part, 25 ... Perforation, 26 ... Rotating shaft, 27 ... Guide plate, 28 ... Guide groove, 29 ... Arc-shaped slot , 30... recess, 31... guide surface, 32... sliding plate, 33... pin, 34... pin, 35... end, 36... guide plate, 37... guide groove, 38,
39... Support column, 40, 41... Band-shaped photographic paper support member, 42... Rocking plate, 43... Tension adjustment roller,
44...Spring.

Claims (1)

[Scope of utility model registration request] A pair of guide clips are positioned between the strip-shaped photographic paper printing device and the developing device, and engage with both ends of a guide clip that engages with the leading edge of the strip-shaped photographic paper on which the image has been printed, and transport the guide clip. In opposing circulation conveyance means such as chains and belts, a pair of first guide plates are supported on the developing section side and are provided parallel to each other on the outside of the circulation conveyance means; , a pair of second guide plates provided in parallel on the outside of the circulation conveyance means, and a second guide plate provided between the first and second guide plates, and slidable according to a change in position between the first and second guide plates. What is claimed is: 1. A belt-shaped sheet conveyance mechanism comprising: a pair of sliding plates connecting first and second guide plates; and tension adjustment means for the circulation conveyance means.