JPS6127872Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a film feeding device that feeds photographic film, magnetic tape, etc. from a storage section that freely stores photographic film, magnetic tape, etc. in a loop shape. The present invention relates to a feeding device for film, etc., which prevents the films, etc., from being sent out in duplicate when the films, etc. are sent out by a conveyance roller.

The feeding device of the present invention can be applied to feeding photographic film, magnetic tape, and other similar film-like materials, and will be described below as a film feeding device.

Conventionally, in this type of device, a pair of transport rollers for transporting the film were placed in a part of the storage chamber where the film was freely stored in a loop shape, and the film in the storage chamber was sequentially sent out to the outside. . However, since the film in the storage chamber has a flexible loop shape, the film being sent out comes into surface contact with the part of the film that is not yet in its turn to be sent out.
Due to the contact frictional force, the film sent out may be rolled up into the pair of conveyance rollers in duplicate. One way to counter this is to separate loops of film that overlap with the film being sent out using a guide plate placed in front of the transport roller to prevent the loops of film from entering the transport roller in duplicate. However, in this method, since the overlapping films are easily separated by the guide plate, there is a risk of damaging the surface of the film with the guide plate, and furthermore, the frictional force between the overlapped films can cause damage to the guide plate. When the frictional force between the surface and the film surface is equal to or greater than the frictional force between the surface and the film surface, the incoming films will not slip on the surface of the guide plate, and will also not slip on the contact surface between the films, so as a result, the films will come in in duplicate. The loop overlaps with the film that is sent out as it is and is wound up by the conveying roller. Using a guide plate in front of the roller in this way not only causes scratches on the film or tape, but also depends on the relationship between the frictional force between the films and the frictional force between the film and the guide plate. There was a drawback that it could not be used as a measure to prevent entanglement.

The present invention solves these drawbacks of conventional film feeding devices, and provides a film feeding device that can more reliably prevent film overlap and feeding, and also prevent film overlap without damaging the surface of the film. This device rotates in the opposite direction to the rotational direction of the conveyance rollers, that is, in a direction that prevents the conveyance of the film, before a pair of conveyance rollers that feed out the film from a storage section that freely stores the film in a loop shape. It is characterized by the arrangement of a double-feed prevention roller.

This will be explained below with reference to the drawings.

FIG. 1 shows an example of a conventional film feeding device of this type, in which 1 is a film, 2 is a storage chamber in which the film is freely stored in a loop shape, and 3 and 3' are in the storage chambers in which the film is stored. A pair of carry-in rollers 4, 4' indicate a pair of transport rollers provided in one section of the storage chamber for feeding the film out of the storage chamber.

In this film feeding device, the film 1
is fed into the storage chamber 2 by a pair of carry-in rollers 3, 3', stored in a loop shape freely within the storage chamber, and after reaching a certain amount, is placed in one section of the storage chamber 2. The conveyor rollers 4, 4' begin to rotate, and the film 1 is sequentially sent out. but,
In such a film feeding device, when feeding the film, as shown in FIG.
A loop in a place other than the film 1 sent out by the roller 4' contacts the rollers 4, 4', and is overlapped by the rollers 4, 4' surface having a large frictional force.
It may get caught between 4'.

In this way, a guide plate is placed in front of the transport roller in order to separate the loops of the incoming film that overlap with the film that is being sent out, and to prevent the loops of film from entering the transport roller in duplicate. An example of a conventional device is shown in FIG. 5 in Figure 3,
Reference numeral 5' denotes a guide plate that prevents loops other than the film to come into contact with the transport rollers 4, 4'. However, in this device, the guide plate 5,
Since the surface of the film comes into contact with 5', the surface of the film is likely to be scratched. In addition, the guide plate 5,
As the film 1 slides on the surface of the guide plate 5', the loop-shaped film escapes upward to separate the overlapped films. Therefore, as mentioned above, the frictional force between the overlapped films and the surface of the guide plate Due to the relationship between the frictional force between the film surface and the film surface, there is a possibility that the duplicate incoming loops will be wound up into the conveyance roller along with the film being sent out, and as a result, the surface of the guide plates 5, 5' Difficult practical problems arise from a processing perspective, such as maintaining a constant friction coefficient and eliminating protrusions and scratches on the guide surface.

The present invention solves these problems and allows the film to be fed out without causing duplicate feeding and without fear of damaging the film. An embodiment thereof is shown in FIG. 4. In the figures, parts similar to those shown in FIG. 1 are designated by the same reference numerals.
In the embodiment shown in FIG. 4, in front of a pair of conveying rollers 4 and 4' that send out the film from the storage chamber 2 in which the film 1 is freely stored in a loop shape,
A pair of overlapping feed prevention rollers 6, 6' are arranged which rotate in a direction opposite to the rotational direction of the conveyance rollers 4, 4', that is, in a direction to prevent the conveyance of the film.

The above pair of overlapping feed prevention rollers 6, 6'
These are rollers whose outer peripheries are made of a rubber-based material that has a large friction coefficient similar to that of the conveying rollers 4 and 4' and does not damage the film, and are arranged at a distance from each other. However, when a certain amount of film is stored in the storage chamber 2 and the conveyance rollers 4, 4' start rotating, the rollers 6, 6' synchronize with the conveyance rollers.
It is rotated in the opposite direction to the conveyance roller. Therefore, in the illustrated example, the loop portion 1', which is about to enter the transport rollers and overlap the film sent out by the transport rollers 4, 4', is moved by the upper roller 6 along the chain line 1 in the figure. The overlapping portion of the film is separated by being actively pushed back upward as shown by ``.Therefore, the loop portion 1' is prevented from being caught in the conveying rollers 4, 4'.
The film 1 is sent out by transport rollers 4, 4' through the gap between the rollers 6, 6'. In this way, the film is reliably fed out by the conveying rollers 4, 4' without damaging its surface and while pushing back into the storage chamber the excess loops that have come in overlappingly. In the figure, numeral 7 indicates a roller that prevents the loop portion of the film being pushed back from being pressed against the inner wall of the storage chamber.

In the above embodiment, the pair of overlapping feed prevention rollers 6, 6', which rotate in the opposite direction to the rotational direction of the transport rollers 4, 4', are arranged apart from each other, so that the film cannot be removed by the transport rollers 4, 4'. The film is prevented from being pulled together by the transporting force of the film and the transporting force of the double-feeding prevention rollers 6, 6'.

FIG. 5 shows another embodiment of the film feeding device according to the present invention. This embodiment uses a combination of one double-feed-out prevention roller 6 and a stationary double-feed-out prevention member 6'' instead of the pair of double-feed-out prevention rollers 6, 6' provided in the embodiment shown in FIG. The blocking roller 6 and the stationary blocking member 6'' are both made of a material such as rubber that has a large coefficient of friction and does not damage the film.

In the apparatus shown in FIG. 5, the film 1 is fed into a storage chamber 2 by a pair of carry-in rollers 3, 3', and is freely stored in a loop shape within the storage chamber 2 until a certain amount is reached. After that, the conveyor rollers 4, 4'
begins to rotate, and the films 1 are sequentially fed out. However, similarly to the device shown in FIG. 4, the duplicate feed prevention roller 6 starts rotating in synchronization with the conveyance rollers 4, 4', and the film fed out by the conveyance rollers 4, 4' is overlapped and conveyed. The loop trying to enter the rollers is prevented from entering the transport rollers by the roller 6 and the member 6'', and the film 1 passes through the gap between the roller 6 and the member 6'' to the transport rollers 4, 4. ’ is sent out.

In the embodiment shown in FIG. 4 above, the film is conveyed by the film conveyance force by the conveyance rollers 4, 4' and the conveyance prevention force by the double feed prevention rollers 6, 6', which are rotated in the opposite direction. In order to prevent the film from being pulled together, rollers 6,
6' are spaced apart from each other. In order to proactively prevent the film from being pulled together by the rollers 4, 4' and the rollers 6, 6', the film is pulled by the transport rollers 4, 4', and the rollers 6, 6 are used to prevent the film from being sent out repeatedly. ' is provided with a slip mechanism that causes the rollers 6, 6' to slip relative to their drive source to allow the rollers to rotate in the forward direction when a rotational force of a certain amount or more is applied in the same direction (positive direction) as the conveyance roller. is preferable. An example of such a slip mechanism is shown in FIG.

In FIG. 6, reference numeral 6 indicates a double-feed prevention roller as shown in FIG. 4, 8 is a shaft thereof, 9 is a support for supporting the shaft, and 10 is a drive gear for driving the roller. The drive gear 10 is not fixed on the shaft 8, but is rotatably mounted on the shaft 8.
Pins 11, 11 are implanted at the ends of the shaft 8, and a presser plate 12 having an axial slot that engages with these pins 11 is mounted on the shaft so as to be slidable in the axial direction. A friction plate 13 is arranged between the plate 12 and the drive gear 10. Furthermore, a leaf spring 14 is attached to the end of the shaft 8 in order to press the presser plate 12 against the friction plate 13 and the drive gear 10 on the shaft 8, and the strength of this leaf spring is adjusted by a nut 15. I'm starting to be able to do it.

The drive gear 10 described above meshes with a gear (not shown) rotated by a drive source (not shown), and when the drive gear 10 is rotated by the drive source,
The rotational torque of the drive gear 10 is transmitted to the presser plate 12 via the friction plate 10, and the presser plate 12 is connected to the pin 11.
Since the roller 6 rotates together with the shaft 8 via the conveyance roller, the roller 6 is rotated in the opposite direction to the conveyance roller. However, when a certain amount of rotational force is applied to the roller 6 in the same direction (positive direction) as the conveyance roller, slips occur on the contact surfaces of the presser plate 12, friction plate 13, and drive gear 10, and the roller 6 It can rotate in the opposite direction to the rotational direction of the drive gear 10. At this time, the torque required to cause the slip phenomenon can be adjusted by adjusting the position of the leaf spring 14 that presses the presser plate 12 against the friction plate 13 using the nut 15.

Note that the circumferential speed of the reverse rotation rollers 6, 6' may be equal to or different from the circumferential speed of the conveyance rollers 4, 4'.

If the above-mentioned slip mechanism is provided, the film can be pulled by the conveying rollers 4, 4' and the duplicate feeding prevention rollers 6, 6' without having to arrange the duplicate feeding rollers 6, 6' apart from each other. Competition is prevented.

As described above, the present invention allows the film to be fed out repeatedly without damaging the film when the film is sent out by a pair of conveying rollers from the storage section where the film is freely stored in a loop shape. can be reliably prevented.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing an example of a conventional film feeding device, FIG. 2 is a diagram explaining its operation, FIG. 3 is a schematic diagram showing another example of a conventional film feeding device, and FIG. 4 5 is a schematic diagram showing one embodiment of the film feeding device according to the present invention, FIG. 5 is a schematic diagram showing another embodiment, and FIG. 6 is a cross-sectional view showing a slip mechanism used in the device shown in FIG. 4. It is a diagram. 1...Film, 2...Storage room, 3,3'...
Carrying roller, 4, 4'... Conveying roller, 5, 5'...
...Guide plate, 6, 6'...Double feeding prevention roller, 6''...Stationary prevention member, 7...Roller, 8...
... Roller shaft, 9 ... Support body, 10 ... Drive gear, 11 ... Pin, 12 ... Pressing plate, 13 ... Friction plate, 14 ... Leaf spring, 15 ... Nut.

Claims (1)

[Scope of utility model registration request] In a feeding device that feeds photographic film, magnetic tape, etc. in a freely looped storage section through a pair of conveyance rollers, the conveyance roller is placed in front of the pair of conveyance rollers. What is claimed is: 1. A feeding device for film, etc., characterized in that a double feed prevention roller is disposed that rotates in a direction opposite to the rotational direction of the film, that is, in a direction that prevents the conveyance of the film.