JP7265247B2 - film feeder - Google Patents

Description

The present invention relates to a film feeding device for feeding film.

The packaging device is provided with a film supply device that supplies the packaging film wound around the original roll. As such a film feeder, there is a revolver type (see Patent Documents 1 to 3). A revolver-type film supply device supports a plurality of original rolls so that they can rotate on their own axis, and also supports these original rolls so that they can revolve along the same circular track. At the time of film supply, the revolution of these original rolls is stopped, and one original roll positioned at a predetermined delivery position rotates. Therefore, the film is fed from the original fabric roll positioned at the feeding position. When the original roll positioned at the delivery position runs out of film, the rotation of the original roll positioned at the delivery position stops, and a plurality of the original rolls revolve to position the other original rolls at the delivery position. After that, the film is continuously supplied by rotating the original roll.

In the film supply device described in Patent Document 1, a clutch device is connected to each of the rotatable film support shafts that individually support the original rolls. By connecting the clutch device connected to the film support shaft supporting the film roll positioned at the delivery position and disconnecting the clutch device connected to the other film support shaft, only the film roll positioned at the delivery position rotates by the power of the motor.

Japanese Patent No. 2584603 Japanese Patent No. 5883612 Japanese Patent Application Laid-Open No. 2005-112409

However, in the technique disclosed in Patent Document 1, a planetary gear mechanism is used as a power transmission mechanism from a motor to these clutch devices in order to use a plurality of clutch devices while allowing the film support shaft to revolve. Since the planetary gear mechanism and clutch device are precise and expensive devices, the film feeding device has a complicated structure and is more expensive.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a film feeder having a simple structure at a low cost.

In order to solve the above problems, the film supply device includes a rotatable turntable, a plurality of support shafts rotatably attached to the turntable, and supporting the original rolls around which the film is wound, Each of the support shafts is connected to the support shaft, receives a torque, rotates on its own axis, rotates the support shaft, revolves along the same circle centered on the rotation axis of the rotation disk as the rotation disk rotates, and is magnetized. a plurality of driven-side joint members forming a coupling; a drive-side joint member arranged on a revolution orbit of the driven-side joint member and forming a magnetic coupling; and a drive for driving and rotating the drive-side joint member have a machine and

According to the above, the plurality of driven side joint members revolves along with the rotation of the turntable, and one of the driven side joint members moves to a position coaxial with the driving side joint member. Since the driven side joint member and the drive side joint member constitute a magnetic coupling, when the driving machine rotates the drive side joint member, the torque of the drive side joint member is transmitted to the driven side joint member, causing the driven side joint member to rotate. A support shaft associated with the member rotates. As a result, the film is unwound from the original roll supported by the support shaft.

Since the driving machine is used as a power source for a plurality of support shafts, it is possible to provide a film feeder with a simple structure at low cost.
In addition, since the magnetic coupling is used, it is not necessary to cut off the magnetic coupling before rotating the turntable when replenishing the original roll. Therefore, it is possible to simplify the configuration of the power transmission section from the driving machine to the support shaft, and to provide the film supply device at low cost.
In addition, since the magnetic coupling is used, accurate positioning of the supporting shaft and the rotating disk is not required, and the film supply device can be provided at low cost.

ADVANTAGE OF THE INVENTION According to this invention, the film supply apparatus of a simple structure can be provided at low cost.

It is a front view of a packaging device. It is a front view of a film supply device. It is a rear view of a film feeding device. FIG. 3 is a perspective view showing the front, right side and top of the film feeding device; FIG. 3 is a perspective view showing the rear surface, left side surface, and upper surface of the film feeding device; It is a left side view of a film feeding device. It is a rear view of a lock mechanism. It is a rear view of a locking mechanism.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, since the embodiments described below are technically preferable and have various limitations for carrying out the present invention, the scope of the present invention is not limited to the following embodiments and illustrated examples.

1. Packaging Apparatus FIG. 1 is a schematic front view of a packaging apparatus 1. FIG.
The packaging device 1 includes a packaged object supply device 11 , a film supply device 20 , a film splicer 12 , a roller 13 , a dancer roller 14 , a roller 15 , a path length adjustment section 16 , rollers 17 and 18 and a packaging machine body 19 .

The packaged item supply device 11 is provided on the upstream side (left side in FIG. 1) of the packaging machine main body 19 . The object-to-package supply device 11 conveys the objects 6 arranged in the horizontal direction in FIG. 1 to the right in FIG. Sequential supply.

A turret-type film supply device 20 holds the original rolls 2 and 3 and continuously feeds the film 4 from one of the original rolls 2 . The other raw fabric roll 3 is for replenishment. When the film 4 wound around the original roll 2 is almost left, the film supply device 20 switches the position of the original roll 2 and the position of the original roll 3. - 特許庁The film 4 wound around the original roll 2 and the film wound around the original roll 3 are the same.

A film splicer 12 and rollers 13 to 15 are provided in a film feeder 20 . The path length adjusting section 16 is provided downstream of the film feeding device 20 . The path length adjusting section 16 has a plurality of upper rollers 16a and lower rollers 16b. When the lower roller 16b approaches the upper roller 16a upward, the path length of the film 4 from the roller 15 to the roller 17 is shortened. Longer path length.

The rollers 17 and 18 are provided downstream of the path length adjusting section 16 . A packaging machine main body 19 is provided downstream of the rollers 18 . The film 4 sent out from the original roll 3 passes through the film splicer 12, the roller 13, the dancer roller 14, the roller 15, the path length adjusting section 16, the roller 17 and the roller 18 in this order, and then the bag making of the packaging machine main body 19. supplied to the vessel 19a.

The packaging machine main body 19 is, for example, a pillow packaging machine main body. The packaging machine main body 19 is a device that sequentially prepares the packages 7 by sequentially wrapping the packages 6 with the film 4 . The packaging machine main body 19 includes a bag making device 19a, a center sealing device 19b, and an end sealing device 19c in order from upstream. The bag-making device 19a rolls the film 4 into a cylindrical shape so that both sides of the film 4 passing through the bag-making device 19a (hereinafter referred to as vertical seams) are overlapped, thereby wrapping the object 6 with the film 4. Envelop. The object to be packaged 6 supplied to the bag making machine 19a by the object to be packaged supply device 11 is conveyed downstream together with the film 4 on the outside thereof. The center sealing device 19b seals the vertical seam of the film 4. As shown in FIG. The end sealing device 19c seals a portion of the film 4 between adjacent packaged items 6 to form a horizontal binding and cuts the horizontal binding.

When a sufficient amount of the film 4 wound around the original roll 2 remains, the film supply device 20 feeds the film while the path length adjustment unit 16 keeps the path length of the film 4 from the rollers 15 to 17 constant. supply 4; Therefore, the packages 7 are sequentially produced by the packaging machine main body 19 .

On the other hand, when the film 4 wound around the original roll 2 is very little, the film splicer 12 cuts the film 4 of the original roll 2 and holds the ends of the cut film 4 . Thereafter, after the film supply device 20 switches the positions of the original roll 2 and the original roll 3 , the film is fed from the original roll 3 to the film splicer 12 . After that, the film splicer 12 cuts the film of the original roll 3, and then splices the leading end of the film to the trailing end of the previous film 4. - 特許庁During such a series of operations, the path length adjusting section 16 shortens the path length of the film 4 from the rollers 15 to the rollers 17 , and accordingly the film 4 is fed from the path length adjusting section 16 to the rollers 17 . Therefore, the flow of the film 4 stops upstream of the roller 15 , but does not stop downstream of the roller 17 .

Note that the film splicer 12 and the path length adjusting section 16 may not be provided.

2. Film Feeding Device The film feeding device 20 will be described with reference to FIGS. 2 to 6. FIG. FIG. 2 is a front view of the film supply device 20. FIG. FIG. 3 is a rear view of the film feeder 20. As shown in FIG. FIG. 4 is a perspective view of the film feeder 20 as seen from the front, top and right. FIG. 5 is a perspective view of the film feeder 20 as seen from the rear, top and left. FIG. 6 is a left side view of the film feeding device 20 as viewed from the left. Here, the left and right directions are determined when the film feeder 20 is viewed from the front, as indicated by the arrows in FIGS.

The film feeding device 20 includes a machine frame 21, a rotary disc 22, a rotary disc driving machine 60, support shafts 31 and 32, reduction gears 33 and 34, and joint members 41 and 42 on the driven side of the magnetic coupling. , a joint member 54 on the drive side of the magnetic coupling, a feed driver 50, and a lock mechanism 70.

2-1. Machine Frame A circular opening 21 a is formed in the front surface of the machine frame 21 . Although the machine frame 21 is provided in a box shape and has a space inside, the illustration of the upper surface, the rear surface, the left side, and the right side of the machine frame 21 is omitted in order to show the inside of the machine frame 21 .

2-2. Rotating Disk A circular rotating disk 22 is fitted into the opening 21a. Inside the machine frame 21, a plurality of guide rollers 21b are provided along the edge of the opening 21a. there is As a result, the turntable 22 is rotatable around a rotation axis passing through its geometric center of gravity and is supported by the machine frame 21 . The rotation axis of the turntable 22 is horizontal.

The direction of rotation of the rotary disk 22 may be restricted to one direction by a ratchet mechanism. Specifically, as shown in FIG. 2, when viewed from the front of the machine frame 21, the direction of rotation of the rotating disc 22 is restricted to clockwise, and even if the rotating disc 22 cannot rotate counterclockwise. good. A ratchet wheel of the ratchet mechanism is provided on a rotating disk 22, and a pawl that engages with teeth of the ratchet wheel is attached to a machine frame 21 so as to be able to swing.

2-3. Turntable Drive The turntable drive 60 drives the turntable 22 to rotate. The turntable drive 60 has a motor 61 , gears 62 and 63 .

The motor 61 is attached to the machine frame 21 around the rotating disk 22 inside the machine frame 21 . The gear 62 is directly connected to the output shaft of the motor 61 . A tooth row of the gear 63 is provided on the peripheral surface of the rotating disk 22 . The gear 62 meshes with the gear teeth of the gear 63 , and the power of the motor 61 rotates the turntable 22 .

2-4. Support Shaft The support shafts 31 and 32 are rotatably attached to the rotating disk 22 by bearings or the like. The support shafts 31 and 32 are provided parallel to the rotating shaft of the rotating disk 22 and pass through the rotating disk 22 in the front-rear direction. The distance between the support shaft 31 and the rotation axis of the turntable 22 is equal to the distance between the support shaft 32 and the rotation axis of the turntable 22 . The support shafts 31 and 32 are arranged along the same circle around the rotation axis of the rotating disk 22 with a central angle of 180° between them. Since the support shafts 31 and 32 are attached to the rotating disk 22, the supporting shafts 31 and 32 revolve along the same circular orbit as the rotating disk 22 rotates.

The original fabric rolls 2 and 3 are mounted on the support shafts 31 and 32 . The support shaft 31 is provided with a mechanism for locking the original fabric roll 2 to the support shaft 31 and preventing the original fabric roll 2 from falling off from the support shaft 31 . The same is true for the support shaft 32 as well.

Inside the machine frame 21 , a gear base 23 is attached to the turntable 22 by a plurality of struts 24 . Therefore, the gear base 23 and the rotating disk 22 rotate integrally. Support shafts 31 and 32 are rotatable by bearings or the like and attached to the gear base 23 .

2-5. Reducer The reducer 33 connects the joint member 41 and the support shaft 31, which will be described later. Specifically, the speed reducer 33 reduces the rotation of the joint member 41 and outputs (transmits) the rotation torque of the joint member 41 to the support shaft 31 .

The speed reducer 33 has a large gear 35 and a small gear 37 . A large gear 35 is attached to the end of the support shaft 31 within the machine frame 21 . A small gear 37 meshes with the large gear 35 . A pinion 37 is rotatably mounted on the gear base 23 .

The speed reducer 34 connects the joint member 42 and the support shaft 32, which will be described later. Specifically, the reduction gear 34 reduces the rotation of the joint member 42 and outputs (transmits) the rotation torque of the joint member 42 to the support shaft 32 .

Reduction gear 34 has a large gear 36 and a small gear 38 . A large gear 36 is attached to the end of the support shaft 32 within the machine frame 21 . A small gear 38 meshes with the large gear 36 . A pinion 38 is rotatably mounted on the gear base 23 .

The small gears 37 and 38 are arranged along the same circle around the rotation axis of the rotary disc 22 with a central angle of 180° between them. As with the support shafts 31 and 32, the small gears 37 and 38 revolve along the same circular orbit as the rotary disc 22 rotates.

2-6. Driven Side Joint Member of Magnetic Coupling A disk-shaped joint member 41 is attached to the small gear 37 so as to be coaxial with the small gear 37 . Therefore, the joint member 41 can rotate together with the small gear 37 . The joint member 41 constitutes a butt-type magnetic coupling. The joint member 41 has a plurality of permanent magnets. For example, the permanent magnets are arranged in the circumferential direction such that the S-pole permanent magnets and the N-pole permanent magnets are alternately arranged. Note that the magnet coupling is also called a non-contact magnetic coupling.

The coupling member 42 is attached to the small gear 38 so as to be coaxial with the small gear 38 . Therefore, the joint member 42 can rotate together with the small gear 38 . The joint member 42 is the same as the joint member 41 and constitutes a butt-type magnetic coupling.

As with the support shafts 31 and 32, the joint members 41 and 42 revolve along the same circular orbit as the turntable 22 rotates.

2-7. Feed Driver The feed driver 50 drives and rotates a joint member 54, which will be described later. The feed driver 50 has a feed motor 51 , gears 52 and 53 .
The feed motor 51 is attached to the machine frame 21 via a base 59 around the rotating disk 22 inside the machine frame 21 . The mounting position of the feed motor 51 is on the upper right side of the turntable 22 when viewed from the front of the machine frame 21 , and on the upper left of the turntable 22 when viewed from the back of the front side of the machine frame 21 . A gear 52 is provided on the output shaft of the feed motor 51 , and the gear 52 meshes with the gear 53 . Gear 53 is rotatably mounted on base 59 .

2-8. Drive Side Joint Member of Magnetic Coupling A disk-shaped joint member 54 is attached to the gear 53 so as to be coaxial with the gear 53 . The joint member 54 forms a pair with the joint members 41 and 42 and constitutes a butt-type magnetic coupling. The joint member 54 and the gear 53 are arranged on a circle (this circle is the orbit of the small gears 37 and 38 and the joint members 41 and 42) centering on the rotation axis of the rotary disk 22. Therefore, when the joint member 41 or the joint member 42 moves to a position coaxial with the joint member 54 due to the rotation of the turntable 22 , the joint member 41 or the joint member 42 faces the joint member 54 . When this happens, the torque of the feed motor 51 is transmitted from the joint member 54 to the joint member 41 or the joint member 42 .

2-9. Lock Mechanism FIGS. 7 and 8 are rear views of the lock mechanism 70. FIG.
A locking mechanism 70 locks and unlocks the rotating disk 22 . When the rotating disk 22 is locked and restrained by the locking mechanism 70, the rotation of the rotating disk 22 is prevented. When the rotating disc 22 is unlocked and released by the locking mechanism 70, the rotating disc 22 is rotatable.

The installation position of the lock mechanism 70 is the lower left side of the rotary disc 22 when viewed from the front of the machine frame 21 , and the lower right side of the rotary disc 22 when viewed from the rear of the front side of the machine frame 21 . The lock mechanism 70 has a swing rod 71 , a latch 72 , a power transmission mechanism 73 and an actuator 74 .

A base end portion of the swing rod 71 is rotatably connected to the bottom portion of the machine frame 21 inside the machine frame 21, and the swing rod 71 is provided so as to be able to swing up and down with the base end portion as a fulcrum. .

The latch 72 is attached to the tip of the swing rod 71 .

The actuator 74 is an air cylinder, a solenoid, or a hydraulic cylinder, and a plunger (also referred to as a rod or piston) 74b of the actuator 74 advances/retreats by air pressure, electromagnetism, or hydraulic pressure. A base end portion 74a of the actuator 74 is rotatably connected to the bottom portion of the machine frame 21 inside the machine frame 21, and the actuator 74 is provided so as to swing up and down with the base end portion 74a as a fulcrum.

The power transmission mechanism 73 is connected between the plunger 74 b of the actuator 74 and the tip of the swing rod 71 . The power transmission mechanism 73 is a link mechanism having links 73a and 73b. One end of the link 73a is rotatably connected to the tip of the plunger 74b of the actuator 74, the intermediate portion of the link 73a is rotatably connected to the machine frame 21, and the other end of the link 73a is connected to one end of the link 73b. The link 73b is rotatably connected, and the other end of the link 73b is rotatably connected to the tip of the swing rod 71. As shown in FIG.

The power transmission mechanism 73 swings the swing rod 71 up and down by the power of the actuator 74 . Specifically, as shown in FIG. 7 , when the plunger 74 b of the actuator 74 advances, the swing rod 71 is swung down by the power transmission mechanism 73 . Therefore, the latch 72 is positioned outside the circular orbit of the joint members 41 and 42 and the pinion gears 37 and 38 about the rotation axis of the rotary disk 22 . As a result, the rotating disk 22 is unlocked.

On the other hand, as shown in FIG. 8 , when the plunger 74 b of the actuator 74 is retracted, the swing rod 71 is swung up by the power transmission mechanism 73 . Therefore, the latch 72 is positioned on the circular orbit of the joint members 41 and 42 and the pinion gears 37 and 38 centering on the rotating shaft of the rotating disc 22 . At this time, if the joint member 41 is positioned coaxially with the joint member 54, the latch 72 engages the joint member 42 or the pinion 38 or their shafts, and the joint member 42 is coaxial with the joint member 54. When positioned so that the latch 72 engages the coupling member 41 or pinion gear 37 or their shafts. Thereby, the rotating disk 22 is locked.

2-10. Operation of Film Feeding Device The operation of the film feeding device 20 will be described.

As shown in FIG. 2, when viewed from the front of the front surface of the machine frame 21, the support shaft 31 is positioned at the upper right extended position, and the support shaft 32 is positioned at the lower left waiting position. In that case, the joint member 41 is coaxial with the joint member 54 and the joint member 41 faces the joint member 54 . Therefore, the torque of the feed motor 51 is transmitted from the joint member 54 to the joint member 41, the rotation of the joint member 41 is decelerated by the reduction gear 33 and transmitted to the support shaft 31, and the support shaft 31 and the original fabric roll attached thereto are transmitted. 2 is driven to rotate. Thereby, the film 4 is let out from the raw fabric roll 2 .

During feeding of the film 4, the swing rod 71 is swung up by the actuator 74 and the power transmission mechanism 73, and the latch 72 is engaged with the joint member 42, the small gear 38, or their shafts. Therefore, the rotating disk 22 is locked and prevented from rotating.

An operator can attach the original roll 3 to the support shaft 32 while the film 4 is being fed. Since the support shaft 32 is positioned at the standby position lower than the delivery position, the mounting work of the original fabric roll 3 is easy.

During feeding of the film 4, the remaining amount of the film 4 wound around the original roll 2 is detected by a sensor. When the detected remaining amount becomes equal to or less than a predetermined threshold value, the feed motor 51 is stopped. After that, as described above, the film splicer 12 cuts the film 4 of the raw fabric roll 2 and holds the ends of the cut film 4 .

After that, the swing rod 71 is swung down by the actuator 74 and the power transmission mechanism 73, and the latch 72 is disengaged from the joint member 42 or the small gear 38 or their shafts. After that, the motor 61 operates and the turntable 22 rotates. When the joint member 42 revolves to a position coaxial with the joint member 54 as the rotary disk 22 rotates, the joint member 42 faces the joint member 54 .

After that, the swing rod 71 is swung up by the actuator 74 and the power transmission mechanism 73, and the latch 72 is engaged with the joint member 41 or the small gear 37 or their shafts. Thereby, the rotating disk 22 is locked.

After that, the feed motor 51 is activated. Therefore, the torque of the feed motor 51 is transmitted from the joint member 54 to the joint member 42, the rotation of the joint member 42 is decelerated by the speed reducer 34 and transmitted to the support shaft 32, and the support shaft 32 and the original fabric roll mounted thereon are transmitted. 3 is driven to rotate. As a result, the film is fed out from the raw fabric roll 3 . Immediately after the start of unwinding of the film from the original roll 3, the film splicer 12 cuts the film of the original roll 3, and then splices the leading edge of the film to the trailing edge of the previous film 4. - 特許庁

An operator can easily attach the original roll 2 to the support shaft 31 while the film is being fed from the original roll 3 .

After that, when the remaining amount of the film on the original roll 3 becomes equal to or less than the predetermined threshold, the feed motor 51, the actuator 74, and the motor 61 are operated in the same manner as when the remaining amount of the film 4 on the original roll 2 becomes equal to or less than the predetermined threshold. Operate.

3. Advantageous Effect (1) Since one motor 61 is used as a power source for both the support shafts 31 and 32, the film feeder 20 has a simple structure. Accordingly, the film supply device 20 can be manufactured at low cost.

(2) Since a non-contact type magnetic coupling is used, accurate positioning of the support shafts 31, 32, rotating disk 22, etc. is not required, and the film supply device 20 can be manufactured at low cost. For example, when the joint member 41 and the joint member 54 face each other, even if misalignment (declination error, clearance error, parallel error, eccentric error) occurs between the joint member 41 and the joint member 54, the torque is It is transmitted from the joint member 54 to the joint member 41 . The same applies when the joint member 42 and the joint member 54 face each other.

(3) Since a non-contact type magnetic coupling is used, it is not necessary to disconnect the magnetic coupling before rotating the rotating disk 22 . Therefore, the configuration of the power transmission section from the feed motor 51 to the support shaft 31 or the support shaft 32 can be simplified. Accordingly, the film supply device 20 can be manufactured at low cost.

(4) Since the non-contact magnetic coupling has a torque limiter function, even if an unexpected overload occurs, the overload does not act on the feed motor 51 . Therefore, the feed motor 51 can be protected.

(5) When the support shaft 31 or the support shaft 32 is positioned at the lower left standby position, the support shaft 31 or the support shaft 32 can be replenished with the original fabric roll. At this time, there is no need to lift the original roll high, and the burden of refilling the original roll is reduced.

(6) Since the original roll can be replenished while the film is being supplied, the film can be continuously supplied.

4. Modification (1) In the above embodiment, the two support shafts 31 and 32 are attached to the rotating disk 22 . Alternatively, three or more support shafts may be attached to the turntable 22 . In this case, these support shafts are arranged at regular intervals along the same circle around the rotation axis of the rotary disk 22 . Also, an output of a reducer similar to reducers 33 and 34 is connected to each support shaft, and a joint member similar to joint members 41 and 42 is provided at the input of each reducer. Assuming that the number of support shafts is N, the rotation angle of the turntable 22 during replenishment of the original roll is 360°/N.

(2) In the above embodiment, the rotating disk 22 is rotated by the power of the motor 61 . On the other hand, an operator may manually rotate the turntable 22 .

(3) In the above embodiment, the engagement and disengagement of the latch 72 are performed by the power of the actuator 74 . Alternatively, an operator may engage and disengage the latch 72 manually. In this case, the latch 72 or the swing rod 71 is fixed with a fastener so that the latch 72 can remain engaged with the coupling member 41 or pinion 37 or their shafts. Similarly, the latch 72 can remain engaged with the coupling member 42 or the pinion 38 or their shafts.

(4) In the above embodiment, the lock mechanism 70 indirectly locks the rotation of the rotating disk 22 . Alternatively, the lock mechanism 70 may directly lock the rotating disk 22 .

(5) The driven side joint member 41 may be directly connected to the support shaft 31 and the driven side joint member 42 may be directly connected to the support shaft 32 .

(6) The joint member 54 on the drive side may be directly connected to the output shaft of the feed motor 51 .

(7) In the above embodiment, the reduction gears 33, 34 are gear transmission mechanisms. Alternatively, the reduction gears 33, 34 may be other types of transmission mechanisms, such as winding transmission mechanisms.

(8) At least two of the above modifications (1) to (7) may be applied in combination.

DESCRIPTION OF SYMBOLS 2, 3... Original fabric roll 20... Film supply apparatus 22... Rotating disk 31, 32... Support shaft 41, 42... Joint member on driven side 50... Feed driver 51... Feed motor 54... Joint member on drive side

Claims (2)

a rotatable turntable;
a plurality of support shafts that are rotatably attached to the rotating disk and that respectively support the original rolls around which the film is wound;
Each of the support shafts is connected to the support shaft, receives a torque, rotates on its own axis, rotates the support shaft, revolves along the same circle centered on the rotation axis of the rotation disk as the rotation disk rotates, and is magnetized. a plurality of driven side joint members constituting a coupling;
one drive-side joint member disposed on the revolution orbit of the driven-side joint member and forming a pair with one of the driven-side joint members to form the magnetic coupling;
a driving machine that drives and rotates the driving side joint member;
A film feeder comprising: 2. The film supply device according to claim 1, further comprising a locking mechanism capable of locking and unlocking rotation of said rotating disk.

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