JPS6029734A - Roll film retrieving device - Google Patents

Abstract

PURPOSE:To prevent an error in retrieving a desired frame by braking a driving and a driven shaft at the same time when the mark of the desired frame is detected, and releasing the braking to the driven shaft temporarily when the number of revolution of the driving shaft exceeds a set value during the braking and thus giving the film a sag. CONSTITUTION:When the number of the desired frame to be retrieved is inputted to an input device 21, a CPU20 judges whether the film is to be forward or backward fed and rotates a motor 8 or 10 to feed the film at a high speed. When the mark is detected by a mark detector 17, brakes 12 and 13 brake the driving and driven shafts at the same time. When the number of revolution of the driving-side motor attains the set value, the driven-side brake is turned off temporarily and turned on again after a set time T2 is elapsed to give the film a sag when a tape is stopped. This time T2 is set experimentally to adjust the extent of the sag, and consequently an error in counting due to the reciprocal oscillation of the frame marks for counting is eliminated to improve the retrieval precision.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a retrieval device for a roll film league, and more particularly to a device for controlling film braking from high speed retrieval to film stop.

The present invention detects a desired piece in the high-speed search described in -h and detects a desired piece. l: By forming more than a certain amount of slack in the film when suddenly stopping the film, the film transport is reduced due to the difference in angular velocity and inertial system between the supply side and take-up side, and the play between the supply cartridge reel and the shaft. The purpose of this is to prevent the possibility that vibration in the feed direction causes erroneous counting and that a desired piece is not retrieved.

First, an example of a microfilm league to which the present invention is applied will be explained with reference to FIG.

1 is a cartridge containing a Jut reel (not shown) wound with a film in the form of a roll; 2 is a delivery roller that sends out the leading edge of the film F in the cartridge 1; 3 is a delivery motor that drives the roller 2; 4 is a delivery motor. 5116 is a film kite roller, 7 is a take-up reel, and 8 is connected to the same rotary shaft 9 of the supply reel to wind the film F into the cartridge L. A reverse feed motor 10 is connected to the rotating shaft 11 of the take-up reel 7, and a forward feed seven-stage motor 1 is connected to the rotation shaft 11 of the take-up reel 7 to wind the film F onto the take-up reel 7.
Reference numeral 2 indicates a first brake for the supply reel shaft 9, and reference numeral 13 indicates a second brake for the take-up reel shaft 11. Various known brakes can be used as these brakes 12-13.

The microfilm F in the cartridge 1 is pulled out from the cartridge 1 by the feed-out roller 2 by the drive of the feed-out motor 3, and sent out toward the take-up reel 7. When the fed film is automatically wound around the take-up reel 7 which is being rotated by the feed motor 10,
When the solenoid 4 becomes inactive and the roller 2 separates from the film, the feeding motor 3 stops 1- at J, l. Thereafter, the film F is fed from the cartridge L to the take-up reel 7 by the drive of the motor 10 (hereinafter referred to as 1).
1 (referred to as 1 send).

14 is a lamp that illuminates the film; 15 is a condensing lens; 16 is a projection lens that enlarges and projects the image of the film illuminated by the lamp 14 onto a screen (not shown);
is a counting mark provided on the side edge of each frame a of film F,
A mark detector 17 optically detects the mark m on the film illuminated by the lamp 14 and converts it into an electrical signal.

In the above m formation, in order to search for a desired film frame, the film is fed at high speed in the forward or reverse direction, the marks m on the two film frames are counted by the optical detector 17,
When the counted value corresponds to the desired frame, the brakes are applied to the driving reel @II and the driven reel shaft at the same time to stop the film, and the frame that has advanced too far is slowly moved back to the projection position. There are ways to stop it.

However, in the above-mentioned high-speed search, the rotation speed N of the drive-side shaft that winds a film with a total number of 3000 frames at high speed as shown in Figure 2 is almost constant from 0 frames to 3000 frames; The rotation speed N of the driven shaft that feeds
2 is a reel.Due to a change in the winding diameter of the reel 2, the rotational speed N of the drive-side shaft changes upward or downward around the 150° frame (midpoint of the film). Furthermore, the slack of the film when the vehicle suddenly stops from high speed is represented by a curve δ. That is, from 0 pieces to 1500
The piece stops under tension until it reaches approximately the halfway point, and the piece stops at 1500
The slack increases significantly from the point where the piece is crossed. In the case of films with different numbers of frames, the number of frames in the vicinity where sag occurs will vary.

This development occurs due to the difference in angular velocity and inertia between the driving and driven shafts when the brakes 12 and 13 are applied. If the slack δ is smaller than the length due to the play in the shaft hole and shaft of the driven film cartridge reel and the reel diameter, the film will vibrate due to the play and the mark m will be detected by the detector 171-. ! If IJ is used, there is a serious problem that an incorrect number of 51 will occur and a predetermined piece will not be retrieved.

Therefore, attempts have been made to separately and independently perform film control when the take-up reel side is the drive side and control when the supply reel side is the drive side. The inertial system on the take-up reel side and the backlash of the shaft and supply/take-up reel cannot be made the same as in the old system, and the difference in I is large between different cartridge formats, making film stop control complicated. It is difficult.

In order to solve the above-mentioned problems, the present invention has the structure described in the claims. Namely, in this type of search device, when a desired piece is detected, the time chart of FIG. A brake signal 24 shown in the flowchart of FIG. 4 is issued to brake the drive shaft and the driven shaft simultaneously (26).

During the braking period, when the rotational speed of the drive shaft reaches the set f〆1 (33 or 34) (after T8 hours), the brake on the driven shaft is temporarily released for a period of 1゛2 (27),
By putting on the ill and its brakes (28),
The present invention is characterized in that erroneous counting is prevented by adjusting the film slack 'δ so that it does not become smaller than the maximum JMI1M.

In order to obtain the signal of the above-mentioned set rotation speed, holes or tooth-shaped disks 33a and 34 are attached to each shaft of the motor 8-10 described in l1iI.
A, and photo sensors 33 and 34 consisting of light emitting elements and light receiving elements 33b and 34b are provided to extract pulse signals and input them to a computer 20 to be described later.

FIG. 5 shows a block diagram of a specific embodiment of the retrieval device that performs the pregly control of the present invention, in which the signals input to the processing unit fi (CPU) 20 of the microcomputer etc. are the mark signal 17 from the mark detector, Inputs such as the frame number of the desired image to be searched from the input device 21 and the correct frame number in the case of an erroneous search 21.33@34 are pulse signals from the photosensor 33 or 34. 8 is the aforementioned reverse feed motor controlled by the CPU 20, 10 is the same forward feed motor, 22 is a forward feed signal sent from the CPU, 2
3 is a reverse feed signal (-), 24 is a brake signal, and 31 is a signal sent from the CPU when the rotational speed of the decelerated drive side motor 10 or 8 reaches a set value. 25 is actuated by the above signals 22 to 24 and 30, and brake 12φ
This is a control circuit that controls 13.

FIG. 6 shows an example of the brake control circuit 25.
-A2, A5 to A7 are AND gates, R1 to R are OR gates, ■ is an inputter, T is a timer, and P is a flip-flop.

When the desired piece number to be searched is input into the human-powered device 21, C.
The PU 20 compares the stored previous search frame number, determines whether to forward or reverse, and rotates the forward motor 10 or the reverse motor 8. If it is a forward feed search, the motor 10 will be on the driving side and the remoter 8 will be on the driven side.

The film is fed at high speed, the detector 17 detects the mark m, the signal is counted by the CPU, and when the number matches the input desired frame number, the CPU sends the signal to the flip-flop P of the brake control circuit 25. A brake activation signal 24 is sent as rlJ to the terminal S of the motor.

Output Q rlJ of flip-flop P is AND gate A
Sent to 1. AND gate Al has forward feed signal 22
Since rlJ is added, the output is OR gate R
A signal is output from I to control the circuit of the second brake l'3 for the shaft 11 of the drive side motor 10, and the brake 13 is
multiply.

The output "l" of the above flip-flop P is the OR gate R3
Manually input to one side of AND gate A5 through. Since the set rotational speed signal 31 is "0", timer T does not operate.
Inverted by inverter and rlJ is antgame 145
, and sends a signal to the next AND gate A6, which in turn sends a signal to the OR gate R2 with the sequential feed signal 22. Therefore, the brake 12 on the driven side also operates simultaneously with the brake 13 mentioned above.

When the rotation of the drive motor 10 is decelerated and the number of pulses from the photosensor 33 matches the number preset in the CPU 20, the signal 31 is sent to the control circuit 25, and the timer T
starts operating.6 Its output r l J is inverted to "0" at the inverter, and the driven side play 'Ji-12 is turned off at the ant gate A and rOJ.

When the set time T2 of the timer T exceeds νJ, the brake 11) and the driven brake 12 are activated. The brakes 12 and 13 continue until the reset signal 30 is manually applied.

That is, the operations shown in the time chart 1 in FIG. 3 and the flowchart in FIG. 4 are performed.

In the case of a reverse direction feed search, the reverse feed signal 23 and the brake activation signal 24 are applied to the AND gate A7, and the brake 12 of the motor 8 on the driving side continues to operate via the OR gate R2 until the reset signal 30 is input. let The reset signal 1) may be sent in conjunction with the start of the next search operation.

On the other hand, the brake 13 of the motor 10 on the driven side is activated by the signal 23→A2 and the signal 24→R3→A! ,, T → Engineering → A5 →
A2 manually inputs the output rlJ of the game 1 and A2 to the game (or game) R+, and starts operation simultaneously with the brake 12.

The rotation speed of the drive side motor 8 reaches the set value, the timer T operates with the signal 31, and the signal to the AND gates A5 and A2 becomes "0".
The driven brake 13 is once disconnected and operates again after the set interval T2.

As described above, when searching microfilm at high speed and suddenly stopping it, the present invention operates the brakes on the driving side and the driven side at the same time, and when the rotation speed on the driving side reaches a set value, the brake on the driven side is temporarily activated. This is to control the sag when the film is stopped by turning off the T2 gap and turning it on again.

Therefore, take into consideration the physical conditions such as the risk of supply side l and take-up side 7, the form of the cartridge reel, etc.

The number of revolutions of the drive motor until the driven side brake is temporarily stopped, its - special holiday [1: 11%' 1111
By experimentally setting T , , the film slack δ occurring on the driven side is adjusted, and the counting piece mark m
The search accuracy can be improved by eliminating the possibility of erroneous counting of -C due to reciprocating vibration.

[Brief explanation of drawings]

FIG. 1 is a perspective view of the main parts of a microfilm reader printer to which the present invention is applied, FIG. 2 is a graph showing the relationship between the number of frames, the amount of film slack, and the reel shaft rotation speed, and FIG. 4 is a flowchart, 51.DELTA. is a block diagram of the brake control device, and FIG. 6 is a brake control circuit 1.DELTA. l is a cartridge, 8φlO is a motor, 12 and 13 are brakes, 17 is a mark detector, 33@34 is a photo sensor, F is a film, and m is a mark.

Claims (1)

[Claims] (1) Search for the desired frame by counting the marks provided on each film frame while feeding the roll film at high speed, and when the desired frame is detected, apply the brake to stop the film and move the desired frame to the enlarged projection position. In a roll film retrieval device that stops the film at the same time, when the mark of the desired frame is detected, the drive shaft and the driven shaft are simultaneously braked, and when the rotation speed of the drive shaft reaches the set value during braking, the drive shaft is braked. A roll film retrieval device characterized in that the brake is temporarily released for a certain period of time to allow the film to slacken.