JP2861722B2 - Photosensitive material supply device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a photosensitive material supply apparatus which can switch various types of photosensitive materials having different width dimensions to an exposure section and convey them.

[0002]

2. Description of the Related Art Generally, in a photographic printing apparatus in which a negative image of a negative film is continuously printed on a long photosensitive material, when the print size is changed, a photosensitive material having a width corresponding to the print size is changed. The exchange of materials is taking place.

In order to facilitate the work of exchanging photosensitive materials, 2
Rolls of two types of photosensitive materials having different widths are accommodated in one magazine, respectively, and each magazine is detachably attached to an apparatus main body, so that the photosensitive material can be switched from each magazine to an exposure unit. The printer device described above has already been proposed.

[0004]

In the conventional printing apparatus, when the photosensitive material is exchanged, the photosensitive material remaining in the transfer path is conveyed toward the magazine by the reverse rotation of the drive roller, and the roll in the magazine is removed. Since the photosensitive material is wound by rotating it manually, there is a problem that it takes time to switch the photosensitive material.

Further, a leading end detection sensor for detecting the leading end of the photosensitive material is provided downstream of the driving roller, and when the leading end detection sensor detects the leading end of the photosensitive material, the driving roller is stopped and is located downstream of the driving roller. Although the tip of the photosensitive material is positioned, the roll is manually rotated to wind up the photosensitive material, so the winding speed of the photosensitive material becomes too fast and the tip of the photosensitive material is wound into the magazine. There were many things to get rid of.

[0006] The present invention solves the above-mentioned conventional disadvantages,
It is a technical object to automate the pulling back of the photosensitive material so that the leading end of the photosensitive material is not caught in the magazine.

[0007]

In order to solve the above-mentioned problems, the present invention has a plurality of magazines for individually accommodating a plurality of rolls of photosensitive materials having different widths, respectively. In a photosensitive material supply device that selects a magazine in which a necessary photosensitive material is stored and transports the photosensitive material extracted from the magazine along a photosensitive material transfer path, the photosensitive material extracted from each magazine A driving roller for conveying the photosensitive material provided in opposition to the roller, a roller driving device for rotating the respective driving rollers in the normal and reverse directions, and a rotation provided only on the same axis as the roll body so that the rotation of the driving roller in the photosensitive material retraction direction is performed a torque transmitting mechanism for transmitting to the body, the rotation of the assembled filled-in rotating body between the rotary member and the roll body is transmitted to the roll body, the load applied to the roll body is set value When it is detected, a friction mechanism that shuts off the rotation transmission to the roll body, and a tip detection sensor that is provided downstream of the drive roller and stops the roller drive device when the tip of the photosensitive material is detected is adopted. It was done. Here, the friction mechanism is used.
2 between the opposing surfaces of the rotating body and the core of the roll body.
Having two discs and a friction plate incorporated between the discs,
One disk is prevented from rotating against the rotating body, and
Movably supported, the other disc is prevented from rotating around the core,
Turn one disk toward the other disk with a spring
A configuration having a pressed configuration can be employed.

[0008]

In the photosensitive material supply apparatus having the above-described structure, the drive roller is rotated by the operation of the roller driving device, and the photosensitive material is fed or pulled back. When the photosensitive material is pulled back, the rotation of the drive roller is transmitted to a rotating body provided coaxially with the roll body via a torque transmission mechanism, and the rotation is transmitted to the roll body via a friction mechanism. For this reason, the pulled back photosensitive material is taken up by a roll body, and when the winding speed is faster than the rewind speed of the photosensitive material pulled back by the drive roller, a slip occurs in the friction mechanism and the rotation transmission to the roll body is interrupted. Is done.

When the leading end of the photosensitive material passes the position of the leading end detection sensor, the roller driving device stops.

[0010]

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

FIG. 1 schematically shows a photographic printing apparatus. On the apparatus main body 1, two magazines 2a and 2b are detachably mounted. Each magazine 2a, the roll body R _1, R ₂ of the photosensitive material A _1, A ₂ is attached to 2b. The widths of the photosensitive materials A ₁ and A ₂ are different from each other. As shown in FIG. 2, a plurality of width detection sensors PH ₁ , PH ₂ , PH ₃ and PH provided at the mounting positions of the magazines 2a and 2b are used. _Four
Is detected by detecting the width detection pins 3 attached to the lower surfaces of the magazines 2a and 2b.

Here, the width detection pin 3 is connected to the magazine 2a,
The mounting position is changed according to the width dimension of the photosensitive materials A ₁ and A ₂ which are detachably mounted in a plurality of pin holes (not shown) provided on the lower surface of the magazine 2b and are stored in the magazines 2a and 2b. You.

The photosensitive materials A ₁ and A ₂ drawn from the magazines 2 a and 2 b are guided to an exposure stage 5 from a width guide 4 provided in the apparatus main body 1, and a negative image of a negative film F ₁ is formed by a printing device 6. Burned.

A tension roller 7 for applying a constant tension to the photosensitive materials A ₁ and A ₂ is provided upstream of the exposure stage 5.
Is provided. On the downstream side of the exposure stage 5, an advance roller 8 and a cutter device 9 are sequentially provided.

As shown in FIG. 2, the width guide 4 has a pair of guide frames 4a and 4b, and guides the side edges of the photosensitive materials A ₁ and A ₂ to the opposing surfaces of the guide frames 4a and 4b. Guide groove 10 is provided. A pair of guide frames 4a, 4
b are supported so as to relatively move.
A pair of guide frames 4a and 4b are pressed outward by a spring 11, and a contact 12 composed of a roller provided on the guide frames 4a and 4b is pressed against a width adjusting cam 13. The contacts and the width adjustment cam of the guide frame 4a are not shown.

The width adjusting cam 13 is rotated by a motor 14, and the width of the width guide 4 is adjusted to the width corresponding to the width of the photosensitive materials A ₁ and A ₂ by the rotation of the width adjusting cam 13.

[0017] each magazine 2a, the driving roller 15a for the photosensitive material conveyed in the transport path of the photosensitive material A _1, A ₂ extending in the width guide 4 from 2b, 15b and, on the photosensitive material A _1, A ₂ width guide 4 Paper guides 16a and 16b for guiding are provided in order in the transport direction of the photosensitive material.
Tip detection sensors 17a and 17b for detecting the tips of the photosensitive materials A ₁ and A ₂ are provided on the sections a and 16b.

A pressure roller 18 is pressed against each of the drive rollers 15a and 15b. The drive rollers 15a and 15b are rotated by the roller drive device 20.

The roller driving device 20 has a roller driving motor 21, and the rotation of a rotation shaft 22 of the motor 21 is attached to the roller shafts 24, 24 of the driving rollers 15 a, 15 b via a plurality of gears 23. It is transmitted to the gear 25.

Here, the plurality of gears 23 are rotatably supported by a gear support arm 26. Gear support arm 26
Is rotatably supported about a rotation shaft 22 of a roller driving motor 21, and a pin 29 provided at a tip end of a switching arm 28 is inserted into an elongated hole 27 formed at a rear end of the gear support arm 26. ing. The switching arm 28 is swung by a switching motor 30. When the switching arm 28 is swung, the gear support arm 26 swings about the rotation shaft 22 of the roller driving motor 21, and the rotation of the roller driving motor 21 is rotated. To one of the pair of drive rollers 15a, 15b.

The rotation of the drive rollers 15a, 15b is controlled by the magazines 2a, 2b via torque transmitting mechanisms 40a, 40b.
It is transmitted to a gear 41 as a rotating body provided coaxially with the roll bodies R ₁ and R ₂ inside.

Each of the torque transmitting mechanisms 40a and 40b includes a plurality of gears 42, and one of the gears 42 is provided with a one-way clutch 43. The one-way clutch 43 is locked when the drive rollers 15a and 15b rotate in a direction to pull back the photosensitive materials A ₁ and A _2, and the one-way clutch 43 is locked.
When a and 15b are rotated in a direction in which the photosensitive materials A ₁ and A ₂ are fed, a free state is established.

For this reason, the torque transmission mechanisms 40a, 40b
Transmits only the rotation of the drive rollers 15a and 15b in the photosensitive material retraction direction to the gear 41, and does not transmit the rotation torque for the rotation in the opposite direction.

[0024] Figure 3 shows a supporting part of the roll body R ₁ housed in the magazine 2a. The support of the roll body R ₂ housed in the magazine 2b is omitted because it is the same configuration as in FIG.

The roll R ₁ has a core 50, which is rotatably supported by a support shaft 51.
The gear 41 to which the rotation of the driving roller 15a is transmitted.
Are rotatably supported by the support shaft 51. A friction mechanism 60 is provided between the gear 41 and the core 50.

The friction mechanism 60 includes a pair of disks 61
a, 61b, and a friction plate 62 incorporated therebetween, and each of the plates 61a, 61b, 62 is pressed toward the end plate 50a of the core 50 by a spring 63 provided on the boss portion 41a of the gear 41, A pin 64 provided on the gear-side disc 61a is inserted into a pin hole 65 formed in the boss 41a of the gear 41 to relatively stop the disc 61a and the gear 41 from rotating. Also, a pin hole 66 is formed in the disk 61b on the core side, and
A pin 67 provided on the 0 end plate 50a is inserted into the pin hole 66 to relatively prevent the core 50 and the disk 61b from rotating.

[0027] The friction mechanism 60 transmits the rotation of the gear 41 to the roll body R _1, R ₂ by the frictional force acting between each other of the pair of discs 61a, and 61b friction plate 62, the roll body R _1, When the rotational resistance acting on R ₂ exceeds the above-mentioned frictional force, slippage occurs between the pair of disks 61 a and 61 b and the friction plate 62.

FIG. 1 shows a state in which the photosensitive material A ₁ stored in the magazine 2 a is drawn out to the exposure stage 5.

[0029] In the replacement of the photosensitive material A _1, after a photosensitive material A ₁ located in the apparatus main body 1 is cut by the cutter device 9, pull back the light-sensitive material A _1, the magazine 2b
Out of the photosensitive material A ₂ from the exposure stage 5 to the position of the advance roller 8.

When the photosensitive material A ₁ is pulled back, the switching motor 30 is operated to swing the gear arm 26 around the rotation shaft 22 of the roller driving motor 21, and the gear 23 at the end of the gear arm 26 is moved to the photosensitive material A _1. And meshes with the driven gear 25 of the drive roller 15a facing the drive roller 15a to switch the drive path.

[0031] After switching of the drive path to rotate the roller drive motor 21, when rotating the drive roller 15a to the photosensitive material unwinding direction, the photosensitive material A ₁ is pulled back. At this time, the rotation of the drive roller 15a is controlled by the torque transmission mechanism 40a.
Is transmitted to a gear 41 provided coaxially with the roll body R ₁ via a shaft.
To be transmitted to the core 50 via a rotating roll body R _1, the photosensitive material A ₁ unwound by the drive roller 15a is wound up by the roll R _1.

[0032] Here, the rotation speed of the roll R ₁ is previously set to be slower than the rotational speed of the drive roller 15a, the winding of the photosensitive material A ₁ as the winding diameter of the roll body R ₁ increases rate increases, if results of the take-up speed is faster than the transport speed of the photosensitive material a ₁ by the drive roller 15a.

At this time, when the tension of the photosensitive material A ₁ is increased and the rotational resistance of the roll body R ₁ is increased, and the rotational resistance exceeds the set torque value of the friction mechanism 60, the friction mechanism 60 is moved to the disks 61a and 61b. slip between the friction plates 62 occurs, transmission of rotation to the roll R ₁ is cut off with.

For this reason, the photosensitive material A ₁ is taken up by the roll body R ₁ with a certain tension, and when the leading end of the photosensitive material A ₁ passes the position of the leading end detecting sensor 17a, the roller driving motor 21 stops. and, winding operation is completed in a state facing the tip of the photosensitive material a ₁ on the downstream side of the driving roller 15a.

After the completion of the winding operation, the width of the photosensitive material A _{2 to be} switched is changed to the width detection sensors PH ₁ , PH ₂ , PH ₃ ,
Confirmed by PH _4, the width of the width guide 4 according to the width of the photosensitive material A ₂ is automatically adjusted.

[0036] If the width of the width guide 4 is set according to the light-sensitive material A _2, the roller driving device 20 by the operation of the switching motor 30, as shown in FIG. 2, switched to a direction of rotating the drive roller 15b , to rotate the drive roller 15b in the feeding direction of the photosensitive material a _2. For this reason, the photosensitive material A ₂ is fed out from the roll body R ₂ in the magazine 2b,
When the leading end of the photosensitive material A ₂ is fed to the position of the advance roller 8, the roller driving motor 21 is stopped.

When feeding out the photosensitive material A ₂ , the driving roller 1
Rotation of 5b is not transmitted to the roll body R _2, roll R ₂
It is rotated only by the feeding of the photosensitive material A _2. At this time, friction mechanism 60 is in a state of imparting rotational resistance to the roll body 15b, thereby preventing the excessively around the roll body R _2.

In the case of the embodiment, a single roller driving device 2
0, the two drive rollers 15a and 15b are switched and rotated.
A roller driving device may be provided for each 5b.

The number of magazines 2a and 2b is not limited to two.

In the embodiment, switching of the photosensitive material of the photographic printing apparatus has been described as an example, but the present invention can be applied to a photosensitive material supply device of a copying machine.

[0041]

As described above, in the supply device according to the present invention, a plurality of photosensitive materials can be automatically switched, and the leading end of the rewound photosensitive material is drawn into the magazine. It can be reliably prevented. When the photosensitive material is rewound, the roll body and the drive
To rotate both rollers in the winding direction, photosensitive material
No sliding between photosensitive material and drive roller, photosensitive material
Can be rewound without scratching.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of a photographic printing device using a supply device according to the present invention.

FIG. 2 is a partially cut-away perspective view showing details of the supply device.

FIG. 3 is a cross-sectional view showing a support portion of the above-mentioned roll body.

[Explanation of symbols]

A ₁ , A ₂ photosensitive material R ₁ , R ₂ Roll body 2 a, 2 b Magazine 15 a, 15 b Drive roller 17 a, 17 b Tip detection sensor 20 Roller drive device 40 a, 40 b Torque transmission mechanism 41 Gear 50 Core 60 Friction mechanism 61 a, 61 b Disk 62 Friction plate 63 Spring

Claims (2)

(57) [Claims] 1. A magazine having a plurality of magazines for individually storing rolls of a plurality of photosensitive materials having different width dimensions, selecting a magazine containing photosensitive materials required for exposure processing, and pulling out the magazine. A photosensitive material supply device configured to transport the photosensitive material along the photosensitive material transfer path, a photosensitive material conveying drive roller provided to face the photosensitive material drawn from each magazine, and A roller driving device for rotating the roller forward and reverse, a torque transmission mechanism for transmitting only rotation of the driving roller in the photosensitive material retraction direction to a rotating body provided coaxially with the roll body,
When the rotation of the set filled-in rotating body between the rotary member and the roll body is transmitted to the roll body, the load acting on the roll body exceeds the set value, the friction mechanism blocking the transmission of rotation to the roll body And a leading end detection sensor provided downstream of the driving roller and stopping the roller driving device when the leading end of the photosensitive material is detected. 2. The friction mechanism has two disks incorporated between opposing surfaces of a rotating body and a core of a roll body, and a friction plate incorporated between the disks. The disc is prevented from rotating with respect to the rotating body, and supported movably in the axial direction, the other disc is prevented from rotating around the core, and the one disc is pressed against the other disc by a spring. The photosensitive material supply apparatus according to claim 1, wherein the photosensitive material supply apparatus has the following configuration.