JPS61228428A - Retrieving device - Google Patents

Abstract

PURPOSE:To remove a slack from a web regardless of the feed direction of the web and to make no flaw in a web and prevent an error in retrieval by applying a brake to rotating shafts on a web take-up side and a web supply side after reversing the rotating shaft on the web supply side. CONSTITUTION:A coincidence signal outputted by a comparison part 34 is sent to delay circuits 40 and 41 and then the 1st and the 2nd brake devices 20 and 21 are driven after delay times of the delay circuits 40 and 41 to stop a film. Thus, the rotating shaft of a film supply side cartridge 1 is reversed slightly, so the film F is tensed slightly and stops without slackening. A forward feed motor 18 is freed from its drive when the coincidence signal is sent and a take-up reel tends to keep on rotating because of the inertia of the forward feed motor 18 and a take-up shaft, but is stopped immediately by the brake device 21.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a search device for searching for desired images on the web, such as films and tapes.

[Technical background and purpose of the invention]

In recent years, with the increase in the amount of information, long microfilms containing a large number of images have become widely used.Normally, when a large number of manuscripts are photographed on microfilm, marks are required to search for the original images. and frame numbers are recorded on the film along with the original. This mark is recorded on each frame on the film or on the side of a selected frame, and when the film is fed, a detector detects the optical signal generated from the mark, and the mark signal output from the detector is recorded on a counter. When the counted value of the counter matches the desired frame number, the film is stopped and the desired image is retrieved. In this kind of search device.

Film is wound around two rotating shafts, and by rotating one rotating shaft, the film is fed from the other rotating shaft to one rotating shaft, and the film is wound onto one rotating shaft. . While the microfilm is being fed, the comparison section compares the desired frame number stored in the storage section with the number of frames counted by the counting section. When the two match, the comparison section outputs a match signal, which is sent to the control section. , and was simultaneously sent to two brake devices that stopped both rotating shafts.

However, in this method of stopping F, there is a time lag between each rotating shaft when it actually stops rotating due to the difference in inertia due to the amount of film wound around each rotating shaft at that time. The film sag and the screen (
The image enlarged and projected onto the image plane (not shown) becomes blurred, and the focus must be adjusted each time, which is inconvenient.

Furthermore, due to slack in the film, the relative positional relationship between the mark detector and the search mark on the film is not constant when the film is stopped, causing erroneous searches.

Furthermore, due to the slackness of the film, when the film is stopped, the film hits a guide plate, etc., resulting in damage to the film.

The present invention aims to eliminate the drawbacks of the above-mentioned conventional examples and provide an apparatus that always projects clear images, does not damage webs such as films, and does not cause erroneous searches.

That is, to provide a search device in which the web does not sag when the web feed is stopped, the relative positional relationship between the search mark and the mark detector is always constant, and errors can be prevented from occurring in the next search. With the goal.

〔Example〕

The present invention will be explained below with reference to the drawings.

FIG. 1 shows a microfilm reader equipped with a retrieval device to which the present invention is applied, in which 1 is a cartridge containing a supply reel wound with a roll of film, and 2 is a delivery roller that sends out a selection of film F in the cartridge 1. ,
3 is a feed-out motor that drives the roller 2, 4 is a solenoid that moves the feed-out roller 2 between a position in contact with the film and a position away from the film, 5.6 is a film guide roller, 7 is a lamp that illuminates the film, and 8
9 is a condensing lens, 9 is a projection lens that magnifies and projects the image of the film illuminated by lamp 7 onto a screen (not shown), and IO detects the counting mark m provided on the side edge of each frame a of film F. 11 is a take-up reel.

The rotation shaft 15 of the supply reel is connected to a reverse feed motor 16, and when the motor 16 is driven, the film F is rewound into the cartridge 1.The rotation shaft 17 of the take-up reel 11 is connected to a forward feed motor 18, and the motor 18 is driven, the film F is wound onto the take-up reel 11. 20
21 is a first brake device that stops rotation of the rotating shaft 15;
is a second brake device that stops the rotation of the rotating shaft 17.

Various known brake devices 20 and 21 can be used.

Microfilm F stored in cartridge 1
is pulled out from the cartridge 1 by the roller 2 by the drive of the feed-out motor 3, and sent out toward the take-up reel 11. The fed film is automatically wound onto the take-up reel 11 which is being rotated by the drive of the progressive motor 18.

When the film is wound around the take-up reel 11, the solenoid 4 is deactivated, the roller 2 is separated from the film, and the motor 3 is stopped and raised. From now on, film F is motor 1
8, the cartridge 1 is fed to the take-up wheel 11. Hereinafter, this will be referred to as forwarding. When the motor 16 is driven without the motor 18 being driven, the film F is fed from the take-up reel 11 to the cartridge 1 in the opposite manner as described above.

Hereinafter, this will be referred to as reverse feeding.The mark detector 10 detects the search mark m on the film F illuminated by the lamp 7.
is detected optically and converted into an electrical signal. The image on the microfilm F is illuminated by a lamp 7 and a condensing lens 8, and is projected onto a screen by a projection lens 9 for viewing.

Figure 2 shows the film feeding path of the above device.
57 and 58 are glass plates arranged parallel to each other and spaced apart,
The film passes through them.

51 to 56 are film guide plates provided along the film feeding path, and 60 and 61 are film guide rollers.

With the above configuration, the film F is transferred to the film guide plate 5.
1 and 52, between 53 and 52, between glass plates 57 and 58, between film guide plates 54 and 56, between 55 and 56, and between rollers 60 and 61.

FIG. 3 shows a retrieval device, and 30 is a counting unit that counts mark detection signals output when the mark detector 10 detects a mark m on the film. The frame number of the existing image and its content match. Reference numeral 31 denotes an operation section for inputting the frame number of a desired image to be searched, or inputting the correct frame number into the counting section 30 in the event of an erroneous search; 32, the desired frame number input into the operation section 31; A memory unit that stores 3
3 is a display unit that displays the contents of the storage unit 32; 34 is a comparison unit that compares the count value A of the counting unit 30 with the frame number B of the storage unit 32; and 35 is a display unit that receives a comparison signal from the comparison unit 34 and displays the film. A control section 36 is a film drive section that stops feeding the film under the control of the control section 35 .

FIG. 4 shows details of the control unit and film drive unit, where At and A2 are AND gates, R1°R2 are OR gates, A3. A4 is an AND gate with negative input on one terminal,
42.43 is a monostable circuit, and 40.41 is a delay circuit. When the film is being fed sequentially, a forwarding signal of "1" is sent to the input lines 45 of the AND gates A2 and A3.

When the film is being fed backwards, a reverse signal of "1" is sent to the input line 46 of the AND gates At and A4. Further, a match signal of "1", which is output from the comparison section 34 when the contents of the counting section 30 and the storage section 32 match, is sent to the input line 47 of each AND gate A1, A2 and the delay circuits 40, 41. The forward rotation signal and the reverse rotation signal are converted from A to B in the comparing section 34.
=C is calculated and is made by the positive and negative of C. Delay circuit 4
The delay time of 0.41 is set to the same predetermined value when the supply section and the take-up section have the same structure, and is set to different predetermined values when they have different structures. Also, monostable circuit 42.43
The setting time of is also set in the same way.

Suppose now that a desired frame number is input into the storage section 32 from the operation section 31 and a search is started. The comparison section 34 compares the contents of the counting section 30 and the storage section 32, and if A<B, outputs a forward signal and sends this signal to the control section 35. As a result, the control section drives the progressive motor 18. On the contrary, A>B
If so, a reverse rotation signal is output and this signal is sent to the control section 35. As a result, the control section drives the reverse feed motor 16.

Furthermore, if A=B, a match signal (stop signal) is sent from the comparing section 34.
is output and sent to the control section, but the control section does not cause any action and the film remains stopped.

First, the case where A<B will be explained. As mentioned above, in this case, the forward feed motor 18 is driven, and the film is moved in the forward direction.
That is, it is sent from the cartridge 1 in the direction of the take-up wheel 11. The mark m detector 10 detects the mark m, converts it into an electrical signal, and sends it to the counting section 30. The counting section adds and counts this. Eventually, when A=B, a match signal (
stop signal) is output.

This coincidence signal is input to AND gates Al and A2.

At this time, the forward rotation signal is output, but the reverse rotation signal is not output, so the AND gate A2 opens, and the monostable circuit 43 is driven by the signal output from the AND gate A2.
The reverse rotation motor 16 is driven for a predetermined time (short time) by the output. On the other hand, the coincidence signal is sent to delay circuits 40 and 41,
The first and second brake devices 20.21 are activated with a delay of the delay time of the delay circuits 40.41 to stop the film.

In this manner, the rotating shaft of the cartridge 1 on the film supply side rotates slightly in the opposite direction, so that the film F is slightly stretched and stopped without any slack. still,
The progressive motor 18 is controlled to turn off its drive when a matching signal is output, and at this time the take-up reel is controlled by the progressive motor 1.
8 and the winding shaft are trying to continue rotating due to inertia, but
The brake device 21 immediately stops the vehicle.

FIG. 4 shows a time chart after the film is running at high speed in the forward direction and the target mark is found. When the match signal 47 is output from the comparing section in FIG. 3 while the film is being fed forward, the AND gate There is no output signal from A3, and the winding motor 18 stops. However, since the motor 18 has inertia, the actual time is 1. It's only moving.

When a match signal is output, a signal is output from the analog gate A2, and a pulse P with a time width t2 is output from the monostable circuit 43. This pulse causes the reverse rotation motor 16 to rotate for a predetermined time t2. Due to the motor 16 rotating in reverse, the film sagged along the film guide plate etc. during high-speed running. The film is pulled slightly in the opposite direction. This eliminates slack when the film is stopped. However, 1. >1. If these conditions are not followed, the film may be pulled too much in the opposite direction, causing vibration in the film running direction when the film is stopped, and the same mark may be counted more than once.

In other words, a miscount occurs.

Furthermore, after time t2 after the coincidence signal is output, the delay circuit 40
．． Brake signals 40', 41' are outputted from the 1st 41, and this signal causes the 1st. The second brake device is activated and the brake is applied, thereby stopping the film. The set time t2 of the monostable circuit 43 is set to an appropriate value depending on the running speed of the film, the structure of the reel, the performance of the brake device, etc. When the film runs in the opposite direction, the operation is the same except for the direction of travel, so the explanation will be omitted.

〔Effect of the invention〕

As described above, in the present invention, when stopping the web feeding, the rotation shaft on the web supply side is rotated in the opposite direction, and then the brakes are applied to the rotation shafts on the web winding side and the web supply side. The web does not sag regardless of the web feeding direction, thereby preventing damage to the web and preventing erroneous searches.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of the main parts of a film reader equipped with a search device of the present invention, FIG. 2 is a configuration diagram of a film feeding path, FIG. 3 is a block diagram of the search device, and FIG. 4 is a main part of the search device. FIG. 5 is a time chart diagram. l-111 Cartridge 11---One take-up reel 16-18---Motor

Claims (1)

[Claims] A retrieval device comprising means for rotating the other rotating shaft in order to wind the web wound around the other rotating shaft onto the other rotating shaft, and brake means for stopping the rotation of each rotating shaft, A retrieval device characterized in that, when stopping web feeding, a rotation shaft on a web supply side is rotated in the opposite direction, and then brakes are applied to rotation shafts on a rear web winding side and a web supply side.