JPH07104551B2 - Information retrieval device - Google Patents

Description

TECHNICAL FIELD The present invention relates to an information retrieval device for retrieving desired information,
In particular, it relates to a roll-shaped film such as a microfilm stored in a cartridge.

[Prior Art] Conventionally, an information retrieval device for retrieving a film frame as desired information in a roll-shaped film (hereinafter referred to as a roll film) such as a microfilm contained in a cartridge is shown in FIG. There is something like this.

This is to guide the film F pulled out from the roll film housed in the cartridge 101 to the guide roller 102.
It is wound around the take-up reel 103 via the above, and then the take-up reel 103 and the rewind reel 104 in the cartridge 101.
And are rotated alternately in the direction of arrow A and B in the figure,
The film frame is searched using an optical system including a light source 105, lenses 106 and 107, and the like.

Here, as shown in FIG. 6, the cartridge 101 is provided with a notch 108 in the upper right corner, and when the roll film F is fed out, a roller 109 which is rotated by a motor or the like enters the notch 108, The rewinding reel 104 is filmed by mounting the 109 on the peripheral surface of the flange 110 of the rewinding reel 104 in the cartridge 101 and bringing the roller 109 into contact with the wide leader tape F ′ attached to the tip of the film F. The roll film is fed from the leading end by rotating the roll film in the feeding direction of F.

[Problems to be Solved by the Invention] However, when the search is completed and the film F is rewound into the cartridge 101, the leader tape is loaded due to the load on the take-up side (for example, the load on the take-up reel or the motor). F '
Is pulled toward the take-up reel, and as shown in FIG.
In some cases, the leader tape F ′ bites between the flanges 110 and pushes the flanges 110 to both sides. Then, the end portion of the expanded flange 110 is pressed against the inner wall of the cartridge 101, and the rewind reel 104 does not rotate.

For this reason, in the conventional device, there is a device that prevents the leader tape F ′ from biting between the flanges 110 by setting the rewinding speed to a low value in advance, but in this case, the overall rewinding speed is low. By becoming
This caused an increase in rewinding time.

In another device, the take-up reel 10 is used for rewinding.
The remaining amount of the film F of 3 is detected, and the rewinding speed is sufficiently reduced and lowered until the leader tape F ′ enters the cartridge 101, and thereafter, the leader tape F ′ is slowly rewound. Some of them prevent them from getting in between, but in this case, the leader tape F '
In order to sufficiently decelerate the cartridge F into the cartridge 101, a complicated control system for detecting the remaining amount of the film F on the take-up reel 103 is required.

The present invention has been made to solve the above-mentioned problems of the prior art. The purpose of the present invention is to set the rewinding speed to a low value in advance and to detect the remaining amount of film on the take-up reel. There is no need for a complicated control system to prevent the leader tape from biting.

[Means for Solving the Problems] In order to achieve the above object, in the present invention, the leading end of a roll film housed in a cartridge is pulled out, and the film is distributed at a predetermined distance from the cartridge through a film transport path. In an information retrieval device that retrieves desired information by winding the take-up reel or a rewinding reel in a cartridge wound around the provided take-up reel, the wide film attached to the leading end of the roll film is used. In order to detect the leader tape, the leader tape detecting means provided in the film conveying path, the speed detecting means for detecting the film conveying speed, the rewinding reel decelerating, or the take-up reel winding. Speed adjustment that slows the rotation speed of the rewind reel relative to the take-up reel by accelerating in the return direction When the leader tape detecting means detects the leader tape when the roll film is rewound, the speed adjusting means operates only for a predetermined time based on the film transport speed detected by the speed detecting means, The rewinding is performed in the state where tension does not work.

When the leader tape detecting means detects the leader tape during rewinding, and the film transport speed detected by the speed detecting means is sufficiently low, the speed adjusting means rotates the rewinding reel and the take-up reel at a low speed. By doing so, it is effective to rewind the leader tape.

[Operation] In the present invention having the above configuration, when the leader tape is detected when the roll film is rewound, the speed adjustment means is operated for a time corresponding to the film transport speed, and tension is not applied to the leader tape. By performing the rewinding in the state, it is not necessary to reduce the rewinding speed.

Further, by changing the time for which the speed adjusting means is operated and the speed adjustment amount according to the film transport speed, it is possible to shorten the overall rewinding time.

[Embodiment] An embodiment of the present invention is shown in FIGS. 1 to 4, and the configuration thereof will be described with reference to FIGS. 1 and 2.

FIG. 1 shows a state in which an opening 21 is provided in the side surface of the cartridge 1 and the leader tape F ′ is sent out from the opening 21. In the notch 11 of the cartridge 1, a rubber roller 12 rotated in the direction of arrow D in the drawing by a delivery motor 22 is provided with a rewind reel 4 in the cartridge 1.
The flanges 13 and 14 (see FIG. 6) are in contact with the peripheral surfaces thereof. Here, the feeding motor 22 and the rubber roller 12 are reciprocally rotatable in the direction of arrow C in the drawing by means not shown, and the rewinding reel 4 only when feeding the roll film.
The flanges 13 and 14 are brought into contact with the peripheral surfaces thereof. Further, a rewinding motor 23 that rotates the rewinding reel 4 in the cartridge 1 in the direction of arrow A in the drawing at the time of rewinding is disposed at the rear position of the delivery motor 22. Then, the guide rollers 2 and 33 and the guide plates 24 and 24 are provided as restricting members for surely conveying the fed film F to the take-up reel 3 side which is arranged at a predetermined interval.
A film transport path is formed by the guide rollers 2 and 33 and the guide plates 24 and 24, and a leader tape detecting means 25 is arranged in the transport path. Here, the leader tape detecting means 25 is composed of a sensor arm 26 and a photo interrupter 27, as shown in FIG. 2, and is capable of detecting the wide portion of the leader tape F '. . An encoder 34 is connected to the guide roller 33, and the encoder 34 outputs a pulse signal FS proportional to the moving amount of the film F to the control circuit 32.
To send to. Further, an optical system including a lamp 5 serving as a light source, lenses 6 and 7, a reflection mirror 29, a screen 30 and the like is arranged between the guide plates 24 and 24, and a frame of a microfilm which is a roll film is arranged on the screen 30. To project. Further, both the rewinding motor 23 and the winding motor 31 are connected to the control circuit 32, and drive signals are supplied to them respectively.
REW and FF are output, and the film F is driven according to this drive signal.
The film is searched by rewinding and winding.
When the rotation of the motors 23 and 31 is stopped, the stop signals ▲ ▼ and ▲ ▼ are output to decelerate the motors 23 and 31 to stop the rotation.

Next, an operation example of this embodiment will be described based on the flowchart of FIG.

First, after the film frame search is completed, a drive signal REW is output to the rewinding motor 23 to rewind the film F onto the rewinding reel 4 in the cartridge 1 at high speed (STEP 1). And
Around the end of the rewinding, the leader tape F ′ provided at the tip of the roll film flips up the sensor arm 26 of the leader tape detecting means 25, and this sensor arm 26 shields the photo interrupter 27 from light. As a result, the leader tape F'is detected (STEP 2) and the leader tape detection signal RS is output to the control circuit 32. In addition, a leader tape detection signal
Upon receiving RS, the rewinding speed of the film F at this time is read from the encoder pulse signal FS, and this rewinding speed is compared with the reference speed Va (STEP 3). When the rewinding speed is higher than the reference speed Va, the rewinding speed is higher than the reference speed Va. Stop signal to return motor 23 ▲ ▼
Is output and TIMER1 as a predetermined time is set (STEP 4).

Here, the reference value Va is the rewinding speed at which the leader tape F'does not spread the flanges 12 and 13 when the rewinding is performed by the same method as the conventional method. The rewinding motor 23 is decelerated.
Further, since the stop signal ▲ ▼ is not output to the winding motor 31, the winding motor 31 and the winding reel 3 continue to rotate due to inertia. In this decelerated state, the leader tape F'is not pulled from the rewinding reel 4, that is, the leader tape F'has no tension. In order for the leader tape F'to be in such a state that no tension acts on it, the stop signal ▲ ▼ to the rewinding motor 23 does not instantly stop the rewinding motor 23, but rather winds due to inertia. The speed is reduced so that the speed is equal to or slightly slower than the rotation of the take-up reel 3.
As a result, the leader tape F ′ and the film F are not pulled inside the rewind reel 4 inside the cartridge 1, so that the leader tape F ′ is flanged.
It bites between 12, 13 and pushes the flanges 12, 13 outwards and pushes them against the inner wall of the cartridge 1, and the rewind reel 4
It is possible to prevent the situation where the rotation does not occur. In such a decelerated state, the time for the beginning portion of the leader tape F'to be rewound into the cartridge 1 along the peripheral surfaces of the flanges 12 and 13 is the rewinding speed of the film F when receiving the detection signal RS. Detected by TIMER1 set by (STEP 5).

Here, the value of TIMER1 is set shorter as the speed increases, as shown in FIG. Then, after the beginning portion of the leader tape F'is rewound, the control circuit 32 outputs the drive signal REW to the rewinding motor 23 again (STEP 6) and sets TIMER2 (STEP 6).
7). Then, when it is detected by the TIMER2 that the remaining portion of the leader tape F'is also wound inside the cartridge 1 (STEP 8), the stop signal ▲ ▼ is sent to the rewinding motor 23 and the winding motor 31. ▲ ▼ and are output (STEP 9), both motors 23 and 31 are stopped, and the rewinding operation is completed.

Further, when the rewinding speed of the film F when receiving the detection signal RS in the processing of STEP 3 is lower than the reference speed Va, it is the same as rewinding by sufficiently slowing down in the conventional example. The F ′ is not pulled inside the rewind reel 4. Therefore, the control circuit 32 outputs the low speed drive signal REWS to the rewinding motor 23, and
Set TIMER3 (STEP10).

Here, the value of TIMER3 is the value at point P shown in FIG. Then, in the low speed driving state at the reference speed Va, the leader tape F'is pulled inside by the rewinding reel 4 and is rewound at a speed that does not bite between the flanges 13 and 14. Further, in the low speed driving state at the reference speed Va, the beginning part of the leader tape F'is the flanges 13,14.
The time during which the cartridge 1 is rewound along the peripheral surface of is detected by TIMER3 described above (STEP 11). Further, after the beginning of the leader tape F ′ is rewound, the control circuit 32 stops outputting the low speed drive signal REWS and outputs the drive signal REW to the rewinding motor 23 (STE).
P12), the processing of STEPs 7, 8 and 9 is performed and the rewinding operation is completed.

As described above, when the rewinding speed of the film F is high, the rewinding motor 23 is decelerated so that tension is not applied to the leader tape F'and the beginning portion of the leader tape F'is set inside the cartridge 1. Once it has been wound up, even if the rewinding motor 23 is driven to exert a tension on the leader tape F ′, the leader tape at the beginning is already on the peripheral surface of the rewind reel 4, The flanges 13 and 14 of the rewind reel 4 will not be pushed apart.

In the above embodiment, when the leader tape detecting means detects the leader tape and the rewinding speed at that time is high, the rewinding motor is decelerated to decelerate the rewinding reel. It is also possible to accelerate the take-up reel in the rewinding direction by accelerating in the rewinding direction so that no tension acts on the leader tape.

Further, as described above, since it takes only a short time to wind the beginning portion of the leader tape into the cartridge, it is possible to wind the beginning portion of the leader tape in the accelerated state.

Furthermore, after the beginning of the leader tape is taken up, even if the take-up motor is returned to normal speed and tension is applied to the leader tape, the leader tape is already attached to the peripheral surface of the take-up reel in the cartridge. Since the beginning of the reel is wound, the flange of the rewind reel is not pushed open.

[Effects of the Invention] As described above, according to the present invention, a leader tape detecting means and a rewinding speed detecting means, which are simpler than those of the prior art, are provided, and when the leader tape is detected, the rewinding speed is changed. The tension is not applied to the leader tape for a certain time, and the beginning part of the leader tape is rewound into the cartridge in this short time, so that the rewinding operation can be performed at high speed without lowering the overall rewinding speed. Therefore, unlike the conventional case, the rewinding speed is not set low in advance, and the rewinding speed itself is not sufficiently reduced even temporarily.

Also, when the leader tape is detected and the rewind speed is low, the rewind operation can be performed without interruption in the low speed drive state, so that the rewind can be performed quickly regardless of the high or low rewind speed. Moreover, it is possible to prevent the rewinding reel from becoming unrevolving without requiring complicated molding for detecting the remaining amount of the film on the winding reel.

[Brief description of drawings]

FIG. 1 is an overall schematic perspective view showing an embodiment of the present invention,
2 is a perspective view showing an essential part of FIG. 1, FIG. 3 is a flow chart showing the operation of the control circuit of this embodiment, FIG. 4 is a view showing the relationship between the rewinding speed and the set time, and FIG. FIG. 6 is a schematic plan view showing a conventional example, FIG. 6 is a perspective view in which a part of the cartridge of FIG. 5 is partially cut away, and FIG. 7 is a vertical cross-sectional view for explaining the problem of FIG. Explanation of symbols 1 ... Cartridge, F ... Film 2 ... Guide roller, 3 ... Take-up reel 4 ... Rewind reel, 5 ... Light source 6 ... Lens, 11 ... Notch 12 ... Roller, 13,14 ...... Flange 22 …… Sending motor, 23 …… Rewinding motor 25 …… Leader tape detection means 26 …… Sensor arm 27 …… Photo interrupter 31 …… Winding motor, 32 …… Control circuit

Claims (2)

[Claims] 1. A front end of a roll film housed in a cartridge is pulled out, and the film is wound around a take-up reel arranged at a predetermined distance from the cartridge through a film transport path. In the information retrieval device for retrieving desired information by rotationally driving the rewinding reel, the leader tape provided in the film transport path for detecting the wide leader tape attached to the leading end of the roll film. By detecting the detecting means, the speed detecting means for detecting the transport speed of the film, and decelerating the rewinding reel or accelerating the take-up reel in the rewinding direction, the rotation speed of the rewinding reel relative to the take-up reel is relatively determined. And a speed adjusting means for delaying the roll film rewinding of the roll film. When the leader tape is detected at this time, the speed adjusting means is operated for a predetermined time based on the film transport speed detected by the speed detecting means, and the leader tape is rewound in a state where tension does not work. Information retrieval device. 2. The speed adjusting means, when the leader tape detecting means detects the leader tape at the time of rewinding and the film transport speed detected by the speed detecting means is sufficiently low,
2. The information retrieval apparatus according to claim 1, wherein the leader tape is rewound by rotating the rewind reel at a low speed without decelerating the rewind reel.