JPS6035722A - Retrieval device for roll film - Google Patents

Abstract

PURPOSE:To prevent mis-counting by providing members which control brakes to slacken a film stopping in a retrieval position and applies tension to the film before and after a mark detector and releasing the action thereof during feeding. CONSTITUTION:A brake control circuit 25 is operated simultaneously on a driving side and a driven side and the brake on the driven side is turned off for time T2 upon lapse of time T1 and is actuated again, by which a microfilm can be slackened as specified when the film stops in the stage of retrieving said film at a high speed and stopping quickly the same. The film when slacked oscillates and stops at an unstable position, thus generating a mis-count in a mark detector 17. Such mis-count is removed by providing members for applying tension to the film, for example, tension rollers 39, 39a, 40, 40a on the right and left of the detector 17. The propagation of the oscillation is thus prevented and during this time the film stops at the stable position without receiving the influence of the oscillation before and behind the detector 17. The mis-count by the mark detector is thus prevented.

Description

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

In the above-mentioned high-speed search, the present invention creates a difference in angular velocity and inertial frame between the supply side and the take-up side by forming a certain amount or more of slack in the film when detecting a desired frame and suddenly stopping the film. The purpose of the present invention is to prevent the possibility that a desired frame is not retrieved due to vibration in the film feeding direction caused by play between the supply cartridge reel and the shaft, which causes erroneous counting.

Furthermore, if the film is stopped after slackening as described in ``2'', the slack causes vibrations, making the film stop position unstable, and erroneous counting is likely to occur. Therefore, it is an object of the present invention to prevent counting errors by using a friction member that prevents the vibration and stabilizes the film stop at least at the position of the mark detector.

Moreover, by releasing the tension applying member that stabilizes the stoppage of the film during film feeding including autoloading of the film, it is an object of the present invention to smoothly and quickly perform autoloading and film feeding after autoloading.

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

1 is a supply reel (not shown) on which the film is wound into a roll.
2 is a cartridge containing a cartridge; 2 is a cart; 3 is a feed roller that feeds out the leading edge of the film F in the cartridge 1; 3 is a roller 2;
4 is a solenoid that moves the feed roller 2 to a position where it comes into contact with the film and a position where it is separated from the film; 5 @ 6 is a film guide roller;
7 is a take-up reel; 8 is a reverse feed motor that is connected to the rotation shaft 9 of the supply reel and rewinds the film F into the cartridge L; 10 is a reverse feed motor that is connected to the rotation shaft 11 of the take-up reel 7 and is used to rewind the film F into the take-up reel 7 is a motor for progressive winding; 12 is a first brake for the supply reel shaft 9; 13 is a second brake for the take-up reel shaft 11;
Various known materials can be used for 13.

The microfilm F in the cartridge 1 is pulled out from the cartridge 1 by the delivery roller 2 by the drive of the delivery motor 3, and sent out toward the take-up reel 7. The fed film is automatically wound around the take-up reel 7 rotated by the progressive feed motor 10, and when auto-loading is completed, the solenoid 4 is deactivated, the roller 2 is separated from the film, and the feed motor 3 is turned off. stops. Thereafter, the film F is fed from the cartridge 1 to the take-up reel 7 by driving the motor 10 (hereinafter, this is referred to as sequential feeding).

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 configuration, 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 film frame are counted by the optical detector 17,
When the plan a(if) corresponds to the desired frame, the brakes are applied to the driving reel shaft and the driven reel shaft at the same time to stop the film, and the frames that have advanced too far are moved back at a slow speed to the projection position. There is a way to stop it.

However, in the above-mentioned high-speed search, the rotation speed N1 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; Rotation speed N of the driven shaft for feeding
2 is the number of revolutions N of the drive shaft around 1500 frames (midpoint of the film) due to changes in the diameter of the reel.
Changes to two levels. Furthermore, the slack of the film when the vehicle suddenly stops from high speed is represented by a curve δ. That is, O piece or 150
It stops under tension until it reaches approximately the halfway point of the 0 piece, and then it stops at 150
The slack increases significantly from the vicinity of exceeding 0 pieces. If the film has a different number of frames, the number of frames that will cause sag will change.

This phenomenon occurs when the brakes 12 and 13 are applied due to the difference in angular velocity and inertia between the driving and driven shafts. If the amount of 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 if the mark m vibrates on the detector 17, it will cause an erroneous count. There is a serious problem that the pieces are not searched.

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, the inertial system on the take-up reel side, and the play between the shaft and the supply/take-up reel cannot be made the same.
The differences between different cartridge configurations are large, making film stop control complex and difficult.

The present invention aims to solve the problems mentioned in "2" below, and embodiments shown in the attached drawings will be described below.

First, to explain brake control, Figures 3 to 6 show that when a desired piece mark is detected, the brakes are applied to the drive shaft and the driven shaft simultaneously, and during this braking, the brake on the driven shaft is temporarily released for a certain period of time. This structure causes the film to sag.

In the block diagram of FIG.
7 and a signal from the human-powered device 21. The input device 21 inputs the frame number of the desired image to be searched;
In case there is an erroneous search, enter a new piece number, etc.

8 and 10 are the aforementioned reverse feed motor and forward feed motor that are controlled by the CPU 20, 22 is a forward feed signal sent from the CPU, 23 is also a reverse feed signal, 24 is a brake signal, and 25 controls the brakes 12 and 13. It is a control circuit.

FIG. 6 shows an example of the brake control circuit 25, where A is an AND gate, R is an OR gate, ■ is an inverter, T is a timer, P is a flip-flop, and each operates as described below.

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

The film is fed at high speed, the detector 17 detects the mark m, the CPU counts the signal, and when the number matches the input desired frame number, the CPU sends the signal to the terminal of the flip-flop P1 of the brake control circuit 25. The brake signal 24 is sent to S as "1". When the brake signal is not output (or not), that is, when the film is being fed, the reset signal 30 is sent as "l" to the terminal R of the flip-flop P1.

Furi, the output Q "1" of the flop P1 is ant game) A
Sent to +. Ant game) For A +, forward signal 2
Since 2 rlJ is applied, a signal is output from the OR gate R1 with its output to control the circuit of the second brake 13 for the shaft 11 of the drive side motor 10, and
multiply.

The output "1" of the above flip-flop P is ant gate A
3 and timer T□, and timer T.

starts operating, and its output becomes the human power of one of the AND gates A3 and sends a signal to the next AND gate A3. Timer T
During the operation of 1, the input of timer T2 becomes rOJ due to inverter 1, so timer T2 does not operate, so rlJ inverted by inverter 2 becomes the other human power of AND gate As, and the next input from A5 Send signals to both inputs of A6.

The other input of the ant gate A6 has a sequential feed signal 23.
is included, the circuit of the first brake 12 for the shaft 9 of the driven motor 8 is controlled through the OR gate R2, and the brake 12 is applied at the same time as the brake 13 described above.

When timer T1 turns off after the set time T1, inverter 1
1, the timer T2 starts operating and outputs "1". "0" inverted by inputter I2 or ANDK) A
Since the output of the AND gate A5 becomes rOJ for the set time T2 of the timer T2, the driven brake 12 is disconnected. When the timer T2 turns off, "l" is input to the AND gate A5 and the driven brake 12 is turned off again.
is activated.

That is, the operations shown in the time chart of FIG. 4 and the flow chart of FIG. 5 are performed.

In the case of backward search, A2 and A7
``1'' is manually input from the CPU as the reverse feed signal 23. When "1" is sent from the terminal Q by the brake signal 24, the output of the ant gate A2 is manually inputted to the ant gate A2 as shown in paragraph 11j, so the brake 13 acts as a driven side for the time T of the timer T1. It turns on, turns off for time T2 of timer T2, and operates again. Since the output Q "1" of the flip-flop P1 and the reverse feed signal 23 constitute the input of the AND gate A7, the output of the AND gate A7 becomes "1" and the brake 12 becomes the driving side and continues to operate.

The brake body operates until a reset signal 30 is manually applied to the terminal R of the flip-flop P. The reset signal is
It may also be sent in conjunction with the start of the next search operation.

-] As shown in item 2, when searching microfilm at high speed and stopping suddenly, apply the brakes on the driving side and the driven side at the same time, and when the time has passed, turn off the brake on the driven side for 12 hours and apply it again. By doing so, a predetermined slack can be created when the film is stopped. The amount of slack may be controlled so as to be larger than the vibration amplitude due to backlash of the supply cartridge reel.

As mentioned above, in making the F-limit of sag larger than the maximum amplitude of vibration due to backlash in the mechanical system that occurs when the film is stopped, the amount of sag is determined by the driven side brake control time T1 and T2.
Adjusted by Therefore, even when using mechanical reels with different backlashes or different types of car trigger reels, high-speed searching can be performed by adjusting the reel to suit each reel. Further, in the forward feed search and the reverse feed search, the inertial systems on the supply side and the winding side may be different, so in that case, the control times T1 and T2 are changed as appropriate.

With the above configuration, even if the brake is controlled to create a slack greater than the length pulled by the backlash of the driven reel, the film vibration caused by the slack will make the stopping position unstable, so the mark detector 17 may cause an error. There is a risk of causing a count.

In order to eliminate this fear, the present invention provides members for applying tension to the film, such as tension rollers 39, 39a, 40, 40a shown in FIGS. 1 and 11-13, on the left and right sides of the mark detector 17.

- With the configuration as shown in FIG. 11, even if there is vibration due to the slack, the tension roller 39
, 39a, 40, and 40a prevent the following movement from spreading, and during that time, the area between the front and back of the mark detection and detector 17 is not affected by vibration and is stopped at a stable position, thereby preventing miscounts caused by the mark detector. be done. Note that since the tension roller rotates along with the film, it may be made of rubber or the like having a large friction coefficient. In that case, in order to protect the image, the structure shown in FIG. 12 may be used so that only both ends contact the film.

With the above configuration, when the film is stopped, vibration on the detector can be prevented and the possibility of erroneous counting can be eliminated.

However, if a tension load is constantly applied, a problem arises in that automatic loading of the film is difficult in the case of a cartridge that does not use a dedicated leader tape. Further, when the film is fed during a search, it becomes a burden and the feeding time becomes longer.

In order to eliminate the drawbacks mentioned above, the present invention cancels the action of the tension roller during automatic film loading and during film feeding.

FIG. 13 shows an example of the tension roller 3.
9a * 40a are fixed, and 39 and 40 are each supported by 42
43, and presses against the F section fixing rollers 39a and 40a with the tension of springs 44-45 to apply tension to the film F. 46 and 47 are solenoids, which are energized during autoloading and film feeding, and support rods 42 and 4.
3 is pulled up against the spring through the suction plates 42a-43a to release the tension.

Then, as shown in FIG. 6, when the autoload signal 55 is input from the human power device 21 to the processing unit (CPU) 20,
A signal is sent from the flip-flop P2 to the OR gate R4, and the solenoids 46-47 are energized to maintain the released state described in "2". The leading edge of the film is wound around the take-up reel 7, the autoload end signal 56 is input to the terminal R of the flip-flop P2, and the signal from the flip-flop P2 to the OR gate R4 is cut off. At that time, the terminal H of the flip flop and amplifier P1
Since the brake reset signal 30 rtJ is input to the high speed search and feed state, a signal is sent from the terminal Q to the (or game) R4, and the solenoids 46 and 47 are still in the energized state.

Therefore, since the tension roller releases its tension action when the film is auto-roped inked, auto-loading can be carried out smoothly.

As the friction imparting member, tension rollers 50 to 52 are provided in a staggered manner for the film shown in FIG. 14, and at least the middle roller 51 is brought into contact with and separated from the film by a solenoid, and the both sides of the film shown in FIG. 15 are held between them. Friction plate 5
It is also possible to have a structure in which both or one of the 3 and 54 is moved forward and backward.

7 to 10 show other embodiments of the brake control device. When a desired piece is detected, the brake signal 24 is issued from the CPU 20 in FIG. 7 as in the previous example, and the brakes are applied to the drive shaft and the driven shaft simultaneously. When the rotational speed of the drive shaft reaches the set value during braking, the brake on the driven shaft is temporarily released for time T2, and then the brake is applied again to reduce the film slack δ to the maximum amplitude. Control the brakes so that the brakes do not become smaller. In FIGS. 7 to 10, functional parts that are the same as those in FIGS. 3 to 6 are indicated by the same reference numerals.

In order to obtain the above set rotation speed signal, the motor 8.
Perforated or tooth-shaped discs 33a and 34a on each axis of 10,
Photosensors 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 the computer 20.

In the same order as in the previous example, the CPU executes the flip-flop flow 1. of the brake control circuit 25 shown in FIG. The brake signal 24 is sent to the terminal S of the pump P as "1j.

The output Q “1” of flip-flop P is AND gate AI
sent to. Ant game) A 1-order sending signal 2 to r
Since 2 rtJ is applied, a signal is output from the OR gate R1 with its output to control the circuit of the second brake 13 for the shaft 11 of the drive side motor 10, and
multiply.

1-The output “1” of the flip-flop P is or game) R
Input one number of AND gate A5 through 3. Since the set rotational speed signal 31 is "0", the timer T does not operate. The input/hater It is inverted and "1" becomes one input of the AND gate A5, and the next AND gate A6.
A64-1 forward feed signal 22 and an or game) R,4 signal are sent. Therefore, the brake 1 on the driven side
2 also operates at the same time as 13 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 CPIT 20, the signal 31 is sent to the control circuit 25 and the timer T starts operating. The output "l" is inverted to "0" by the inverter, and the driven side brake 12 is turned off at the output voltage 1-A5 rO,1.

When the set time T2 of the timer T expires, the driven brake 12 is activated again. The brakes 12 and 13 continue until the reset signal 30 is input.

That is, the operations shown in the flowcharts of FIG. 8, time chart 1-, and plS9 are performed.

In the case of reverse feed search, the reverse feed signal 23 and the brake signal 24 are input to the AND gate A7, and the or game) R2
The brake 12 of the motor 8, which is now on the drive side, is operated continuously until a reset signal 30 is input. The reset signal 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 the signal 23→A2, the signal 24→R3→A5, and the signal T→I+A5→A.
2, the output "1" of the anime game 1.A2 is input to the game hR+, and the operation is started simultaneously with the brake 12.

When the rotation speed of the drive side motor 8 reaches the set value, the timer T operates with the signal 31, and the signal rOJ to the game) A5 fist A2 is sent.
The driven brake 13 is once turned off and operates again after a set time T2.

Brake control is performed when the film is stopped as described above, and the driven side brake is temporarily stopped in consideration of the physical conditions such as inertia of the supply side 1 and take-up side 7, the shape of the cartridge reel, etc. By experimentally setting the rotational speed of the drive motor and its temporary pause time T2,
This is to adjust the film slack δ that occurs on the driven side.

By adding the above-mentioned tension applying member and its releasing device during autoloading and high-speed feeding to this device, the same effects as in the previous embodiment can be obtained.

[Brief explanation of the drawing]

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. 3 is a brake control according to the present invention. A block diagram of the device, FIG. 4 is a time chart of the brake, FIG. 5 is a flowchart thereof, FIG. 6 is a brake control circuit diagram, and FIGS. 7 to 10 are diagrams of other embodiments shown in FIGS. 6, FIG. 11 is a front view of the tension roller as a friction applying member, FIG. 12 is a modification thereof, FIG. 13 is an explanatory diagram of its electromagnetic movement mechanism, and FIGS. 14 and 15. is another example of the friction imparting member. ■ is the cartridge, 8 races 10 is the motor, 12 and 13 are the brakes, 17 is the mark detector, 33 @ 34 is the photo sensor, F is the film, m is the mark, 39 * 39a, 40 @
40a is a tension roller, 44-45 is a tension roller pressing spring, and 46 and 47 are tension roller retraction solenoids. Figure 15 Figure 14 Figure 12 Figure 11 Figure 13

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 at a retrieval position, the brake described above is controlled so as to cause slack in the film stopped at the retrieval position, and members are provided to apply tension to the film before and after the mark detector, and the tension applying member is provided. 1. A roll film retrieval device characterized in that the action is controlled to be canceled when the film is fed.