JPH0451454B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a strip material feeding device that automatically feeds the free end (tip) of a strip material wound around a spool along a predetermined path to a winding section. Regarding.

Long strip materials such as microfilm, magnetic tape, or movie film (hereinafter collectively referred to as strip materials) are wound on reels and stored in cartridges for ease of handling and storage. be done. Therefore, for example, in a microfilm reader, magnetic recording and reproducing device, camera, or movie projector, an automatic device is required for stripping off the leading end of a roll of strip material in a cartridge and feeding it to a winding section.

Conventionally, this type of belt material feeding device rotates a roll of belt material in a cartridge in the unwinding direction, brings one of a plurality of pulleys around which an endless belt is wound into contact with the roll of the belt material, and then By making the direction of rotation of the endless belt at a point opposite to the direction of rotation of the rolls, the free end (tip) of the strip material on the outermost circumference of the roll is stripped off, and the tip of the stripped strip material is removed by the endless belt. A type that sends out the reel is known.

This type of strip material feeding device requires the endless belt to be moved back and forth between a forward operating position in contact with the rolls and a backward resting position away from the rolls.
Generally, among the plurality of rollers that hang and hold the belt endlessly, one drive roller is placed at a fixed position, so its endless length changes during the above-mentioned back and forth movement. Furthermore, since there are differences in the winding diameter of the roll of the strip material, the moving distance changes accordingly, and the belt must expand and contract significantly accordingly. However, due to the strength and tension of the belt, it is not possible to move it a large distance. Therefore, there was a problem that a small diameter strip reel could not be used.

The present invention solves the above-mentioned problems, and provides a belt material feeding device that can be applied regardless of the roll diameter, can always automatically and reliably feed the material smoothly, and maintains its function for a long time. The purpose is to
The present invention is characterized in that at least one of the pulleys is an automatically variable diameter V-pulley so that the total length of the endless belt suspended around a plurality of pulleys as described above is kept substantially constant when the belt moves back and forth. .

The present invention will be explained below using specific examples shown in the drawings. FIG. 1 shows a microfilm reader to which the present invention is applied, where 1 is a cartridge, and F is a spool 2 of a supply reel 2 housed in the cartridge 1.
3 is a driving roller 6, an endless belt rotatably hung around driven rollers 4 and 5, 7 is a pinch roller, 8 to 10 are guide rollers, 11A to 11E are guide plates, and 12 is a winding film. 13 is an illumination lamp, 14 is a condenser lens, 15 and 16 are transparent glass plates placed opposite each other across the film feeding path, 17 is a projection lens, and 18 is a screen.

The drive roller 6 is driven by a drive source to be described later and rotates in the direction of the arrow, and the endless belt 3 is driven by the rotation of the roller 6, and the rollers 4 and 5 are driven to rotate.

The take-up reel 12 is provided with an automatic take-up device (not shown), and the leading end of the film is automatically wound onto the take-up reel by this automatic take-up device. The take-up reel 12 is connected to a motor (not shown) and is rotated by the motor in the direction of the arrow.

FIG. 2 shows the details of the film feeding mechanism. In the same figure, 50 is an endless belt rotatably hung around rollers 51 and 52, and is made of a material having a high coefficient of friction such as rubber. The rollers 51 and 52 have a pulley shape, and the roller 51 is fixed to a drive shaft 53, and the roller 52 is rotatably supported by a shaft 55 fixed to a movable arm 54. The movable arm 54 is rotatable around the drive shaft 53,
It is biased by a coil spring 56 to rotate counterclockwise.

When a wire 57 connected to a shaft 55 provided on the movable arm 54 is pulled in the direction of the arrow A, the movable arm 54 rotates clockwise to the stop position by the stopper 58 and is placed in the position shown in FIG. When the wire 57 is loosened, the movable arm 54 rotates counterclockwise due to the action of the coil spring 56, so that the endless belt 50 comes into contact with the outermost circumference of the film roll, and the drive shaft 53 is driven by a drive source (motor) to be described later. When driven, the endless belt 50 is driven in the direction of the arrow B, and the reel 2 is rotated in the direction C of unwinding the film. Note that the reel 2 is rotatably held by a holding shaft 59 coupled to a drive source.

The stripping roller part is a drive roller 6 with a fixed shaft position.
It consists of driven rollers 4 and 5 bearing at both ends of an arm 63, these rollers are V-pulley-shaped, and a round belt 3 is hung around them.

One of them 4 is a stripping roller, and as shown in FIGS. 5 and 6, there is a gear-shaped uneven portion 4A on the peripheral surface.
is formed. The outermost circumferential surface of the gear 4A protrudes outward from the outer surface of the endless belt 3 wound around the V-groove 4B, and when the gear 4A moves in a direction approaching the outermost circumference of the film on the reel, the gear 4A It contacts the outermost periphery of the film and does not come into contact with the endless belt 3. The roller 4 is made of a material with a small coefficient of friction,
For example, it is made of plastic material such as Delrin (trade name). The uneven shape of the peripheral surface of the roller 4 is not limited to that of the illustrated embodiment.

In the embodiment, another driven roller 5 is divided into two parts 5A and 5B in the axial direction from the center, and is rotatably fitted onto a shaft 64 fixed to an arm 63. One of the rollers 5A is connected to the arm 63 via the collar 61A.
A coil spring 65 is inserted between the other roller 5B and the spring receiver 61 provided on the shaft 64.
is provided to always apply closing force to the dividing rollers 5A and 5B. When a tension greater than a set value is applied to the endless belt 3, the roller 5B opens against the spring 65.
It is configured with an automatic variable diameter V-pulley that closes when the tension is removed.

That is, the driven roller 5 is arranged so that the depth of the V-shaped groove (the diameter of the pulley 5) formed by the divided rollers 5A and 5B changes according to the tension of the endless belt.
is configured.

The arm 63 is a movable arm 70 (Fig. 2).
It is fixedly supported by a receiving member 71 fixed to.
The movable arm 70 is rotatable about a shaft 73 and is biased by a coil spring 74 to rotate counterclockwise. When the wire 57 connected to the member 71 is pulled in the direction A, the movable arm 70 rotates clockwise.
3 is placed in the position shown in FIG. 75 is a stopper of the movable arm 70. When the wire 57 is loosened, the arm 70,
63 rotate in the counterclockwise direction, and the stripping roller 4 comes into contact with the outermost periphery of the film wound on the spool 2A.

FIG. 7 shows the drive mechanism of the drive roller 6 and the wire 5.
7 shows the tension/relaxation mechanism of drive roller 6.
is fixedly supported by a drive shaft 80 connected to a forward/reverse rotation motor M, and rotates in the H direction in FIG. 2 when the motor M rotates clockwise. Guide rollers 82 and 83 are arranged at both ends of the drive roller 6, slightly apart from the drive roller 6. As shown in FIG. 8, the guide rollers 82 and 83 have a larger outer diameter than the drive roller 6 and are rotatably supported by a drive shaft 80. A coating layer 6A made of a material with a large friction coefficient, such as a rubber material, is formed on the circumferential surface of the drive roller 6.
(Fig. 8), and a groove 6B in which the endless belt 3 is fitted is provided in the center thereof.
The outer diameter of the endless belt 3 wound around the drive roller 6 and the outer diameter of the drive roller 6 are determined by the guide rollers 82 and 8.
It is set smaller than the outer diameter of No. 3. Further, the drive roller 6 has a width smaller than the width of the film to be fed. 84 is a wide film (e.g.
This is an auxiliary guide roller for guiding a 35 mm film), and is rotatably supported by a drive shaft 80.

In FIG. 7, reference numeral 90 denotes a friction disk that is interlocked with the drive shaft 80 via a one-way clutch 91, and rotates integrally with the drive shaft 80 when the motor M rotates to the left. Reference numeral 92 is a drum for winding the wire 57, which is rotatably held on a cylindrical shaft 90A integral with the friction disk 90. 93, 93A are felts arranged on both end surfaces of the drum 92, 96 is a spring receiving plate provided on the cylindrical shaft 90A on the opposite side of the drum 92 from the friction disk 90, and a coil spring 97 is placed between the felt plate 93A. The drum 92 is pressed against the friction disk 90 via the felt 93 by the action of the coil spring 97, and the drum 92 is coupled to the friction disk 90 via a friction transmission mechanism made of felt or the like.

Therefore, when the motor M is driven in the reverse direction, the friction disk 90 is rotated to the left via the one-way clutch 91, which causes the drum 92 to rotate and the wire 57 to be connected to the drum 9.
2, the movable arms 54, 70 are moved to the position shown in FIG. 2, and the endless belts 3, 50 are placed in the inactive rest position.

In this state, when the motor M rotates forward, the one-way clutch 91 is disengaged, and the friction plate 91 becomes free. On the other hand, since the arms 54 and 70 are pulled by the return springs 56 and 74, the wire 57 is pulled, the drum 92 is reversed, and the movable arms 54 and
70 rotates counterclockwise, and the film stripping roller 4 and endless belt 50 come into contact with the outer periphery of the film on the reel 2.

In FIG. 7, a gear 98 is fixed to the drive shaft 80, which is linked to the drive shaft 53 of the endless belt 50 by a mechanism not shown in the figure, and when the motor M is driven, the endless belt 50 is driven. _M2 is a rewinding motor, which is connected to a holding shaft 59 that holds the reel 2. When the motor _M2 is driven, the reel 2 rotates counterclockwise, and the film is wound onto the reel 2.

In FIG. 2, the pinch roller 7 is connected to the arm 11.
0, and the arm 110 is rotated clockwise by a coil spring 112 toward the shaft 111.
The stopper 116 is biased to rotate around the
It is stopped by. One end of the arm 110 is connected to a solenoid plunger 114 via a coil spring 113.
When the arm 110 is activated, the arm 110 rotates counterclockwise, and the pinch roller 7 is pressed against the drive roller 6. As shown in FIG. 8, the pinch roller 7 has a roller 2 made of a material with a large friction coefficient such as rubber on its circumferential surface.
Two rings 115 are wound, and these two rings 11
5 is provided at a position where it comes into contact with the coating layer 6A of the drive roller 6 when the pinch roller 7 is pressed against the drive roller 6.

Next, the operation of the above device will be explained. Before the film is fed out from the supply reel 2, it is in the state shown in FIG. When a start button (not shown) is operated, the motor M rotates forward and the solenoid plunger 114 is activated. As described above, the normal rotation of the motor M causes the drive roller 6 and the roller 51 to rotate in the directions of the arrows, respectively, and drive the endless belts 3 and 50 in the directions of the arrows G and B.

Further, as described above, since the wire winding drum 92 is free to rotate, the arms 54 and 70 are rotated counterclockwise by the springs 56 and 74, respectively.

The rotation of the arm 54 causes the endless belt 50 to come into contact with the outermost circumference of the film roller F, and rotate it in the direction C in which the film is unwound. On the other hand, the arms 70 and 63 integrally rotate to the left in the figure. In this case, since the driving roller 6 is at a constant position, the driven rollers 4 and 5 move at a constant interval, and the arms 70 and 63 stop at the position where the stripping roller 4 contacts the outermost periphery of the film roll.

In this state, the stripping roller 4 rotates in the opposite direction to the rotation direction of the film roll, and when the leading edge of the film comes into contact with the gear portion 4A of the roller 4, the leading edge of the film is stripped from the roller, and the drive roller 6 and pinch roller 7 and is guided by an endless belt 3.

If the diameter of the film wound on the reel 2 is large in the relationship between the above-mentioned rest position in Figure 2 and the operating position in Figures 3 and 4 of the stripping roller 4,
The amount of movement of the driven rollers 4, 5 differs between the case of a small roller (Fig. 4) and the case of a small case (Fig. 4), and the length and tension of the endless belt 3 suspended around them also differ.

At this time, the present invention is configured so that the variable diameter V pulley 5 opens against the spring 65 in response to the change in tension, and the pulley diameter is adjusted to maintain the entire length of the endless belt 3 constant.

Therefore, since the endless belt 3 does not expand or contract to a large extent, there is no need to use a highly elastic belt. Further, since the tension of the endless belt is kept substantially constant, the pressing force of the stripping roller 4 against the film can also be made substantially equal. This applies to all film rolls, even those with large differences in diameter as shown in Figures 3 and 4. Since the endless belt 3 undergoes little expansion and contraction change, it has advantages such as durability and smooth and reliable stripping function.

When the leading end of the film is wound around the take-up reel 12, the solenoid plunger 114 is deactivated by a signal from a winding detector (not shown), and the motor M is switched to reverse rotation. Drive shaft 8 due to reversal of motor M
0 to the friction disk 90 and the wire winding drum 9
2 rotates, and the wire 57 is wound around the drum 92. By winding the wire 57, the arms 54, 70
rotates clockwise, the stripping roller 4 and the endless belt 50 are separated from the outer periphery of the film on the reel, and return to the original rest state in FIG. 2. The motor M rotates in reverse for a certain period of time and then stops.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram of a microfilm reader to which the present invention is applied, FIG. 2 is a configuration diagram of a film feeding device, FIGS. 3 and 4 are diagrams explaining the operation of the film feeding device, and FIG. 5 is a perspective view of a part of it, No. 6
The figure is a plan view of FIG. 5, FIG. 7 is a cutaway perspective view of the drive mechanism, and FIG. 8 is a sectional view of the drive roller and pinch roller. 2 is a feeding reel, F is a strip material roll, 3,50
is an endless belt, 4 is a roller, 5 is an automatically variable diameter V
Pulley 65 is a pressure spring.

Claims (1)

[Claims] 1 Consists of multiple pulleys and an endless belt suspended around them, one of the pulleys has a fixed rotating shaft position and receives driving force to rotate the endless belt, while the other pulleys move. In a device in which one of the pulleys contacts the circumferential surface of a roll of strip material and strips off the tip of the strip material and sends it out, at least one of the plurality of pulleys has a V-shaped groove that engages with the endless belt. 1. A belt-shaped material feeding device, characterized in that it is configured such that the depth of the groove changes depending on the tension of the endless belt.