JPH07267485A - Film conveying device - Google Patents

Abstract

PURPOSE:To immediately release the pressed state of a film by a pressing roller by rocking connecting plates, and lifting the pressing roller as the film is stretched between a cartridge and a conveying means when the film is extracted from the cartridge. CONSTITUTION:The negative film 2 extracted from a cartridge 1 is conveyed to an exposure section by a conveying means 5 constituted of a driving roller 7 and a pressing roller 6 along a conveyance path 3, then it is rewound. A mechanism section 14 releasing the pressed state of the negative film 2 by the pressing roller 6 is arranged. A pair of connecting plates 14a are arranged on both sides of the conveyance path 3 in the seesaw state on a fulcrum shaft 14b, and the pressing roller 6 and a rear end detecting roller 13 are pivotally supported at both end sections respectively. When the negative film 2 is completely extracted from the cartridge 1, the negative film 2 is stretched, the rear end detecting roller 13 is lowered by the negative film 2, the pressing roller 6 is lifted, and the pressed state is immediately released.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a film-conveying device with a cartridge.

[0002]

2. Description of the Related Art Generally, a film transport device is constructed so that a drive roller and a pressure roller are used to press the film, and the rotation operation of these rollers pulls out the film from the cartridge to transfer the film. When pulled out, the film transport operation is temporarily stopped and then rewound.

However, in the conventional film transport apparatus, when the film is completely pulled out from the cartridge and the rotation of the pressure roller is stopped, the stop state of the pressure roller is detected by the optical sensor, and the rotation of the drive roller is detected by the detection signal. Was trying to stop. Therefore, there is a time lag between the time when the film is completely pulled out from the cartridge and the time when the drive roller stops, and the rotation of the drive roller during that time applies a large amount of tension to the film, causing it to come off the spool or There was a problem with roller scratches and roller marks.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and an object of the present invention is to obtain a film at the time when it is completely withdrawn from the cartridge.
It is an object of the present invention to provide a film transporting device capable of immediately releasing the pressure-bonded state of a pressure-bonding roller and preventing the film from coming off the spool and from scratches on the roller.

[0005]

SUMMARY OF THE INVENTION A film transporting apparatus according to the present invention is a film transporting apparatus for pulling out a film contained in a cartridge wound in a spool and transporting the film along a transporting path. A transporting unit composed of a driving roller and a pressure roller disposed with the sheet sandwiched therebetween, and a trailing end detection roller disposed between the transporting unit and the cartridge for detecting the trailing end of the film. And, in a state where the trailing edge detection roller is located in the transport path, the pressure bonding roller is pressure-bonded to the film, and, in a state where the trailing edge detection roller is disengaged from the transportation path, the pressure bonding roller is It is characterized by comprising a release mechanism portion for releasing pressure bonding to the film.

[0006]

According to the film transport apparatus of the present invention, when the pressure roller is pressure-bonded to the film, the trailing edge detection roller is positioned in the transportation path, so that the film is curved at the trailing edge detection roller. Will be transported in. On the other hand, when all the film is pulled out from the cartridge, the film is strongly stretched between the cartridge and the transporting means, so that the trailing edge detection roller is pressed by the strongly stretched film and comes out of the transport path. The pressure-bonded state of the pressure-bonding roller to the film is released.

[0007]

EXAMPLE A film transporting device is configured to transport a negative film 2 drawn out from a cartridge 1 along an transporting path 3 to an exposure section for performing an exposure process, and rewind the processed film 2 back into the cartridge 1. (Fig. 1).

The film 2 is wound around a spool 4 and is housed in a cartridge 1 with the end of the film 2 engaged with the spool 4 (FIG. 2).

The conveying means 5 is formed by arranging a driving roller 7 and a pressure roller 6 with the conveying path 3 interposed therebetween (FIGS. 1 to 3). The drive roller 7 is rotated by a motor M. That is, the driving pulley 9 fixed to the drive shaft 8 of the motor M and the roller shaft 7 of the drive roller 7.
The belt 11 is stretched between the driven pulley 10 fixed to a and the drive roller 7 is rotated by the rotation of the drive shaft 8.

The pressure roller 6 is a pressing member 12 such as a spring.
Is elastically urged toward the drive roller 7 with the drive roller 7
(Fig. 2, Fig. 3). Then, when the drive roller 7 rotates, the pressure roller 6 is driven to follow the film 2
While pressing, the film 2 is rotated to convey the film 2.

Reference numeral 13 denotes a trailing edge detection roller for detecting the trailing edge of the film 2, which is disposed between the conveying means 5 and the cartridge 1 (FIGS. 1 to 3).

Reference numeral 14 denotes a releasing mechanism portion for releasing the pressure-bonding state of the pressure-bonding roller 6 to the film 2, which is constructed by arranging a connecting plate 14a freely in a seesaw (FIG. 1). That is, a pair of connecting plates 14a are arranged on both sides of the transport path 3,
The connecting plate 14a is rotatably supported by a fulcrum shaft 14b, the roller shaft 6a of the pressure roller 6 is supported at one end of the connecting plate 14a, and the trailing end detection roller 13 is provided at the other end of the connecting plate 14a. Roller shaft 13a is supported, and the connecting plate 14a is elastically urged by the pressing body 12 described above.

When the pressure roller 6 presses the film 2, the other end of the connecting plate 14a is moved upward by the elastic force of the pressing body 12 and the upper portion of the trailing end detection roller 13 is moved into the conveying path 3. It projects (Fig. 2). On the other hand, when the trailing edge detection roller 13 is pushed down against the elastic force of the pressing body 12, the pressure roller 6 is moved upward by the connecting plate 14a and the pressure state of the film 2 is released (FIG. 3). ).

The elastic force of the pressing body 12 prevents the trailing edge detection roller 13 from being inadvertently moved downward while the film 2 is being conveyed, and the film 2 is completely pulled out from the cartridge 1 and the conveying means 5 and the cartridge. The size is set so that the trailing edge detection roller 13 is pushed down by the film 2 when stretched between the film 1 and the film 1.

The film transporting device constructed as described above operates as follows. (1) First, when the pressure bonding roller 6 is pressure bonded to the film 2, the trailing edge detection roller 8 projects from the transport path 3. When the film 2 is transported in this state, the film 2 is transported over the upper portion of the trailing edge detection roller 13 between the transport means 5 and the cartridge 1 (FIG. 2).

(2) When the film 2 is completely withdrawn from the cartridge 1, the film 2 is stretched between the cartridge 1 and the conveying means 5. At the same time, the trailing edge detection roller 13 is pressed downward by the stretched film 2, and the pressure bonding roller 6 moves upward to separate from the driving roller 7 to release the pressure bonding state of the film 2 (FIG. 3). .

In this way, the film 2 is the cartridge 1
When all of the film 2 is pulled out, the pressure-bonded state of the film 2 by the pressure-bonding roller 6 is immediately released.

(3) Next, the drive roller 7 is reversed to rewind the film 2 into the cartridge 1.

In this embodiment, the film transporting device is applied to the photographic printing device, but it is needless to say that the film transporting device is not limited to this, and can be applied to a photographic developing device, for example.

[0020]

As is apparent from the above description, according to the film transport apparatus of the present invention, when the film is completely withdrawn from the cartridge, the pressure-bonded state of the film by the pressure-bonding roller is immediately released, so that the film is It is possible to prevent the film from being continuously tensioned after it is completely pulled out from the cartridge, to prevent the film from coming off the spool, and to prevent the film from being scratched or scarred.

[Brief description of drawings]

FIG. 1 is a perspective view of a film transport device of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a cross-sectional view showing a transport release operation of the film transport device of the present invention.

[Explanation of symbols]

 1 Cartridge 2 Film 3 Conveying Path 4 Spool 5 Conveying Means 6 Crimping Roller 7 Driving Roller 13 Rear End Detection Roller 14 Release / Removal Mechanism Section

Claims (1)

[Claims] 1. A film transporting device for pulling out a film contained in a cartridge wound on a spool and transporting the film along a transport path, wherein a drive roller and a pressure roller arranged with the transport path sandwiched therebetween. And a trailing edge detection roller disposed between the feeding means and the cartridge to detect the trailing edge of the film, and the trailing edge detection roller in the feeding path. In the state of being located at, the pressure roller is pressure bonded to the film, and
A film transport device comprising: a release mechanism section that releases the pressure of the pressure roller against the film when the trailing edge detection roller is disengaged from the transport path.