JPS6056761A - Sheet winding device - Google Patents

Abstract

PURPOSE:To always take out a stable signal of completion of winding and endure high-speed rotation by providing a light source and a light receiving element, forming a winding detection means, in opposition to each other on the outer peripheral side and the inner peripheral side of the winding core, on the core part of a sheet winding device. CONSTITUTION:A winding detector of a sheet winding device is composed of a lamp 23 and a photosensor 24. The lamp 23 and the photosensor 24 are respectively arranged inside the hollowness of a winding core 18 and in the vicinity of the tip of a guide plate 14 in such a manner as they are in opposition to each other with a film winding wall 18b of the winding core 18 interposed between them. Although a light from the lamp 23 is received by the sensor 24 while the film is not wound on said core 18, when the tip of the film is wound on the core 18, the light from the lamp 23 is intercepted and a signal of completion of winding is generated from the sensor 24. Power supply to a motor 7 is stopped due to this signal and solenoid 9 becomes inoperative, and a capstan roller 6 moves to a position separated from a microfilm. The film is later fed to the reel 12 consecutively.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a winding device for winding a long sheet around a winding shaft, and more particularly to a winding device equipped with a detection means for detecting that a sheet is wound around a winding shaft. It is something.

Conventionally, in this type of device, as shown in FIG. 1, a microswitch 2 is disposed inside a hollow winding core 1, and this microswitch is rotated together with the winding reel. A movable contact 3 of the micro switch 2 projects to the outside through a hole 4 provided on the outer periphery of the winding core. When the microfilm F is wound around the outer periphery of the winding core 1, the movable contact 3 of the microswitch 2 is pressed by the film, the microswitch 2 is activated, and the microswitch 2 generates a winding completion signal.

However, in order to extract the winding completion signal from the microswitch 2 that rotates together with the winding core 1, it is necessary to provide a mechanical contact such as a sliding brush, and it is unstable due to contact failure due to contact wear etc. The winding completion signal could not be retrieved, which often caused trouble in film feeding.

In addition, since the microswitch rotates together with the take-up core, the microswitch itself may become damaged due to repeated rapid rotations and stops, and there is also the disadvantage that the rotation speed of the take-up core cannot be made very high. Ta. Furthermore, since the detection means such as a microswitch comes into direct contact with the film, there is a drawback that the film is easily scratched.

SUMMARY OF THE INVENTION An object of the present invention is to provide a sheet winding device that eliminates the drawbacks of the conventional example described above, can sufficiently withstand high-speed rotation of a take-up reel, and can reliably detect winding of a sheet. It is in.

The present invention will be explained below using specific examples shown in the drawings.

FIG. 2 shows a film feeding section of a film leader to which the present invention is applied.

In the same figure, 5 is a film supply cartridge that stores microfilm F in a roll, and 6 is a cartridge 5.
7 is a feeding motor for rotating the capstan roller 6; 8 is a film reverse motor for rotating the film spool inside the cartridge; 9 is a capstan roller 6; This is a solenoid that moves the microfilm F to a position where it contacts the microfilm F and a position where it moves away from the microfilm F.

10.11 is a film guide roller; 12 is a take-up reel; 13 is a fixed guide plate arranged around the take-up reel 12 and arranged in the main body of the device; 14 is a movable lever rotatable about a shaft 15; 16 17 is a rotatable guide roller provided at the tip of the lever 14, and a coil spring 17 rotates the lever 14 clockwise.

The lever 14 is biased by the action of a coil spring 17 so that the guide roller 16 approaches the core portion (film winding shaft) 18 of the take-up reel 12 .

19 is a film forwarding motor for rotating the take-up reel 12; 20 is a lamp for illuminating the film; 21 is a condensing lens; 22 is for enlarging and projecting the image of the film illuminated by the lamp 2o on a screen (not shown). It is a projection lens.

Although not shown, a guide plate is provided between the cartridge 5 and the take-up reel 12 to guide the film along a predetermined path. Further, flanges 18a are fixed to both ends of the core portion 18 of the take-up reel 12.
In FIGS. 2 and 3, the front flange is omitted.

In the reader, when the motor 7 is driven and the lenoid 9 is activated, the capstan roller 6 rotates and moves to a position where it contacts the microfilm F.

Due to the contact between the capstan roller 6 and the microfilm, the leading edge of the film is fed out from the cartridge 5.
The film F is fed toward the take-up reel 12 along a predetermined path.

Before the leading edge of the film reaches the take-up reel 12, the motor 19 is driven and the take-up reel 12 rotates in the direction of the arrow.

The leading edge of the film sent to the take-up reel 12 is guided by the fixed guide plate 13 and advances along the guide plate 13, then guided by the lever 4 and automatically wound around the take-up core 18.
When the film is wound around the winding core section 8, a winding completion signal is generated from a winding detector which will be described later.

Figure i3 is a perspective view showing the outline of the winding detector according to the present invention. The winding detector consists of a lamp 23 and a photosensor 24. are arranged near the tip of the guide plate 14, and both are arranged at positions facing each other with the film winding wall 18b of the winding core 18 interposed therebetween.

FIG. 4 is a sectional view showing details of the wrapping detector. In FIG. 4, the lamp 23 is fixed to the tip of an L-shaped arm 25, and the arm 25 is fixed to a main body substrate 26.

A hollow part 18' is formed inside the winding core 18, and the lamp 23 is placed in the hollow part 18'. In addition, the winding core 1
The sheet winding wall 18b is made of a material that transmits light. For example, the winding wall 18b of the winding core is made of a transparent material such as acrylic resin.

In the above-described configuration, when the film is not wound around the winding core 18, the photo sensor 24 receives light from the lamp 23, but the tip of the film (which is opaque) is attached to the winding core. When wrapped around the photo sensor 24, the light from the lamp 23 is interrupted by the film.
no longer receives light, and a winding completion signal is generated from the photo sensor 24.

In response to this winding completion signal, the power supply to the motor 7 is cut off, the solenoid 9 is deactivated, the rotation of the capstan roller 6 is stopped, and the capstan roller 6 is moved to a position away from the microfilm. Thereafter, the film F is sequentially fed to the winding wheel 12 by the motor 19.

Next, when the motor 9 is stopped and the motor 8 that rotates the film in the cartridge 5 is driven, the film F is rewound onto the spool in the cartridge 5, that is, it is reversely fed.

On the male side, the sheet winding wall +8b of the winding core is made of a transparent material, but an opening for light passage may be formed in the winding wall 18b. Further, the winding wall may be a light-transmitting diffusing surface.

If the leading edge of the film is transparent, opaque tape or the like should be attached to the leading edge of the film.

In addition, in the above embodiment, the lamp is placed in the hollow part of the winding core.
Although the photosensor is placed on the guide plate, the same effect can be obtained even if the photosensor is placed in the hollow part of the winding core and the lamp is placed on the guide plate. can.

As explained above, in the present invention, since the light source and the light receiving element constituting the winding detection means are provided facing each other on the outer circumferential side and the inner circumferential side of the winding core, it is possible to always obtain a stable winding completion signal. Since the detection means is not directly identified on the take-up core, there is no problem of unstable generation of the winding completion signal due to contact failure as in the conventional example mentioned above, and there is an effect that the rotation speed of the take-up reel can be increased. .

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a conventional example of a winding detection device, FIG. 2 is a diagram of a film feeding section of a film leader to which the present invention is applied, and FIG. 3 is a schematic diagram of a winding detector according to the present invention. FIG. 4 is a cross-sectional view of the winding detector.
--Lamp 24----Photo sensor applicant Canon Corporation

Claims (1)

[Claims] A detection means for detecting that the sheet is wound around the winding shaft is composed of a light source and a light receiving element, and is configured so that light can pass through the sheet winding surface of the winding shaft. One of the detection means is provided so as not to rotate, and the sheet winding surface is sandwiched between the detection means,
A sheet winding device characterized in that the other of the detection means is provided outside the winding shaft so as to face one of the detection means.