JPH0529896B2 - - Google Patents

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to a device for extracting a film from a roll of film such as a micro film and searching for a frame of the film, and particularly relates to a device for extracting a film from a roll of film such as a micro film and searching for a frame thereof. The present invention relates to a device for searching a type of film.

(Prior Art and Problems) Conventionally, as a device for searching a roll film (hereinafter referred to as a roll film) such as a micro film stored in a cartridge, the one shown in FIG. 3 is known. This device winds a film F pulled out from a roll film stored in a cartridge 1 onto a take-up reel 6 via a known film guide roller 4, etc., and then unwinds the film F in the take-up reel 6 and the cartridge 1. reel 2
0 alternately in directions B and A, respectively, to search for film frames using an optical system comprising a light source 7, lenses 8, 9, etc.

A partially cutaway perspective view of the cartridge 1 is shown in FIG. The cartridge 1 as described above is provided with a notch 12 at the upper right corner in the figure, and this notch 12 is provided when the roll film is fed out.
A roller 2 made of rubber or the like rotated by a motor (not shown) is inserted into the cartridge 1, and the wide roller 2 is attached to the tip of the film F that rides on the circumferential surface of the flange portions 21, 22 of the rewind reel 20 inside the cartridge 1. The roller 2 is brought into contact with the leader tape F', and the rewind reel 20 is rotated in the film feeding direction, so that the rolled film is sent out from its tip.

However, when the film frame search was completed and film F was being rewound into cartridge 1,
Due to the load on the take-up side (load of the take-up reel, motor, etc.), the film F is pulled in the direction of the take-up reel, and the leader tape F' is pulled to the flanges 21 and 2 as shown in FIG.
2 and pushes the flanges 21 and 22 apart to both sides. Therefore, the flange 2 widened
1 and 22 are pressed against the side wall of the cartridge 1, and a situation occurs in which the rewind reel 20 stops rotating.

Conventionally, there has been a device that attempts to reduce the load on the take-up reel by reversing the motor (not shown) on the take-up reel 6 side to the rewind side, thereby preventing the leader datater F' from being wedged.

However, in the conventional device described above, the take-up reel 6
Because the film is forcibly fed out, if the speed of the take-up reel is high, the film F will sag in the transport path or reel, and this will cause it to collide with the guide surface of the transport path for guiding the film, causing damage to the film F. Furthermore, when the film F is slack, the film F may jump out of the conveying path.
A problem arises in that the film F may be folded. In addition, the rewind reel 20 in the cartridge
In order to match the unwinding speed of the take-up reel 6 with the delivery speed of the take-up reel 6, a new control circuit or the like must be provided, making the device complicated and expensive.

(Means for Solving the Problems) The present invention solves the problems of the above-mentioned apparatus and reduces the load on the take-up reel when rewinding the film into the cartridge with a simple configuration. It is an object of the present invention to provide a film retrieval device that does not cause the film to sag.

In order to achieve the above object, the present invention winds a film from a supply reel on which a film having a leader tape having a width wider than the gap between a pair of flanges of a supply reel in a cartridge is wound onto a take-up reel. A film retrieval device that searches for a desired film frame by rotationally driving a supply reel, comprising a drive means for driving a drive shaft rotatably supporting a take-up reel in forward and reverse directions, and a drive means for driving the drive shaft to a predetermined position. a coupling mechanism that rotates the take-up reel in the film winding direction when rotated in the direction and rotates the take-up reel in the film feeding direction when rotated in the opposite direction to the predetermined direction; , when rewinding the film onto the supply reel in the cartridge, the drive shaft is rotated in the opposite direction at a higher speed than the take-up reel, so that the connection between the take-up reel and the coupling mechanism can be released. It is constituted as a thing.

(Example) Hereinafter, an example of the present invention will be described based on the attached FIGS. 1 and 2. FIG. 1 is a perspective view showing the overall configuration of an apparatus according to an embodiment of the present invention.
In addition, FIGS. 3 to 5 show the conventional device described above.
The same parts as those in the figure are given the same reference numerals.
Similar explanations will be omitted.

In FIG. 1, an opening 15 is provided in the side of the cartridge 1, and a leader tape F' is shown being fed out from the opening 15. In the notch 12 of the cartridge 1, a rubber roller 2 rotated in the direction of arrow D by a motor 3 is in contact with the circumferential surface of a flange of a rewind reel 20 (see FIG. 4) inside the cartridge 1. The motor 3 and rubber roller 2 are capable of reciprocating rotation in the direction of arrow C by means not shown, and are brought into contact with the circumferential surface of the flange of the rewind reel 20 only when feeding out the roll film. There is. Further, a motor 13 is disposed behind the motor 3 to rotate the rewind reel 20 in the cartridge 1 in the direction A during rewinding.

Known guide rollers 4, 4 and guide plates 5, 5 are provided as guides for reliably conveying the fed film F to the take-up reel 6 side, which is arranged at a predetermined interval. . An optical system consisting of a lamp 7 serving as a light source, lenses 8 and 9, a reflecting mirror 10, etc. is disposed between the guide plates 5, 5.

The take-up reel 6 is provided with a rotational drive means indicated by the arrow E.
A motor 70 that can rotate in both directions (F and F) is provided, and rotates in the E direction during winding and rotates in the F direction during unwinding. This motor 70
A one-way bearing 72, which is a type of one-way clutch, is disposed between the rotating shaft 71 and the take-up reel 6 as a coupling mechanism. This one-way bearing 72 rotates the take-up reel 6 in the direction B (film winding direction) when the rotating shaft 71 is rotated in the direction of arrow E (film winding direction) during winding of the film F. When the rotating shaft 71 rotates in the film feeding direction indicated by the arrow F during rewinding of the film F, no driving force is transmitted. That is, when rewinding the film F, the rotating shaft 71 of the motor 70 is set to rotate in the direction of the arrow F, but since the one-way bearing 72 is in the direction of release, the take-up reel 6 is not driven. No force is transmitted, resulting in what is called an idle rotation state. By doing this, it is possible to create a state in which no load from the motor is applied to the take-up reel 6. In addition, in order to maintain the above-mentioned idling state when rewinding is started and the take-up reel 6 rotates in the rewind direction (anti-B direction), the rotational speed of the rotating shaft 71 must be at least lower than the rotation speed of the take-up reel 6. It is necessary to set the rotation speed to be faster.

With the apparatus of this embodiment having the above configuration, when the film F is rewound onto the rewind reel 20 in the cartridge 1 after the film frame search is completed, the rotating shaft 71 on the take-up reel 6 side rotates idly in the direction F. Therefore, the load is only the rotational load of the reel 6, so the inertia due to unwinding is reduced and the film F is no longer subjected to excessive tension, and the leader tape F' of the film F is attached to the flanges 21, 2 of the rewind reel 20.
The unwinding was completed by running onto the flanges 21 and 22 without any occurrence of the situation where the tape was wedged between the two. Moreover, no slack occurred in the film F during rewinding.

Next, another embodiment of the present invention will be explained based on FIG. In the above-described embodiment, the one-way bearing 72 is used as the coupling mechanism, but in this embodiment, the electromagnetic clutch 80, which is an electromagnetic one-way clutch, will be described. However, since the basic configuration of the device of this embodiment is the same as that of the device shown in FIG. 1, FIG. The same parts shall be shown.

The electromagnetic clutch 80 is disposed between the motor 70 and the take-up reel 8, and has an electromagnet 81 fixed to the inner surface of the frame 84 inside. A bearing 82 is provided between the frame 84 and the rotating shaft 71.
is disposed, and since the driving force from the rotating shaft 71 does not reach the frame 84, the electromagnet 81 is at a predetermined position. An iron disk 83 fixed to the rotating shaft 71 is disposed between the take-up reel 6 and the rotating shaft 71 within the range covered by the magnetic force of the electromagnet 81 . The take-up reel 6 has an elastic member 62' facing the disk 83.
An iron projecting piece 62 is provided through the motor 7.
It is adapted to be attracted to the disk 83 by the magnetic force of the electromagnet 81 which is energized during rotation in the 0E direction. Since the take-up reel 6 has a bearing 61 interposed between it and the rotating shaft 71, there is almost no load when the projecting piece 62 is apart from the disc 83.

With the configuration of the device of this embodiment, a no-load state can be created without causing the motor 70 and its rotating shaft 71 to rotate in reverse (rotation in the F direction).

(Effects of the Invention) According to the device of the present invention having the above-described configuration, excessive tension is not applied to the roll film in the cartridge, so that the leader tape is wedged between the flanges of the unwinding reel in the cartridge. In addition, since the rolled film is not forcibly fed out from the take-up reel side, problems such as folding of the film caused by slack in the film do not occur.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an apparatus according to an embodiment of the present invention;
FIG. 2 is a partially sectional view of another embodiment of the device, FIG. 3 is a diagram showing the general configuration of a conventional device, FIG. 4 is a partially cutaway perspective view of the cartridge shown in FIG. 3, and FIG. FIG. 3 is a diagram showing how the leader tape is wedged between the reels. 1... Cartridge, 6... Take-up reel, 20
... Rewinding reel, F ... Film, 70 ... Drive means (motor), 72; 80 ... Connection mechanism (72
...One-way bearing, 80...Electromagnetic clutch).

Claims (1)

[Claims] 1. Winding a film from a supply reel on which a film having a leader tape having a width wider than the distance between a pair of flanges of a supply reel in a cartridge is wound onto a take-up reel; A film retrieval device for retrieving a desired film frame by rotationally driving the film includes a drive means for driving a drive shaft rotatably supporting a take-up reel in the forward and reverse directions, and a drive means for driving the drive shaft in a predetermined direction. a coupling mechanism that rotates the take-up reel in the film winding direction when rotationally driven, and rotates the take-up reel in the film feeding direction when rotationally driven in a direction opposite to the predetermined direction; When rewinding onto the supply reel in the cartridge, the drive shaft is rotated in the opposite direction at a higher speed than the take-up reel, so that the connection between the take-up reel and the coupling mechanism can be released. A film search device featuring: 2. The film retrieval device according to claim 1, wherein the coupling mechanism is a one-way clutch.