JPH0576621B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a search device for a roll film reader;
In particular, the present invention relates to a device for controlling film braking from high-speed retrieval to film stopping.

In the above-mentioned high-speed search, the present invention creates a slack in the film of a certain amount or more when detecting a desired frame and suddenly stopping the film, thereby reducing the angular velocity and inertia of the supply side and the winding side. The vibration in the feeding direction of the film caused by the difference between the
The purpose of this is to prevent the possibility that a desired piece will not be retrieved.

Furthermore, if the film is stopped with slack as described above, the slack causes vibrations, making the stopping position of the film unstable, and erroneous counting is likely to occur. Therefore, it is an object of the present invention to prevent the vibration at least at the mark detector position to stabilize the film stop and prevent counting errors.

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

Reference numeral 1 denotes a cartridge containing a supply reel (not shown) in which a film is wound into a roll, 2 a feed-out roller that feeds out the leading end of the film F in the cartridge 1, 3 a feed-out motor that drives roller 2, and 4 a feed-out roller. 2 is a solenoid that moves the film F to a position in contact with the film and a position away from the film; 5 and 6 are film guide rollers; 7 is a take-up reel; 10 is a forward feeding motor connected to the rotating shaft 11 of the take-up reel 7 and winds the film F onto the take-up reel 7; 12 is a first motor connected to the supply reel shaft 9;
A brake 13 is a second brake for the take-up reel shaft 11, and various known brakes can be used as the brakes 12 and 13.

The microfilm F in the cartridge 1 is transferred to the feed roller 2 by the drive of the feed motor 3.
The cartridge 1 is pulled out from the cartridge 1 by the holder 1 and fed to the take-up reel 7. When the fed film is automatically wound around the take-up reel 7 rotated by the forward feed motor 10, the solenoid 4 is deactivated, the roller 2 is separated from the film, and the feed motor 3 is stopped. Thereafter, the film F is fed from the cartridge 1 to the take-up reel 7 by the drive of the motor 10 (hereinafter referred to as sequential feeding).

14 is a lamp for illuminating the film; 15 is a condensing lens; 16 is a projection lens for enlarging and projecting the image of the film illuminated by the lamp 14 onto a screen (not shown); m is for each frame a of the film F; A counting mark 17 provided on the side edge is a mark detector that 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, and the counted value is determined as the desired frame. When this occurs, a method can be considered in which the brakes are applied to the driving reel shaft and the driven reel shaft at the same time to stop the film, and the pieces that have advanced too far are slowly fed back and stopped at the projection position.

However, in the above high-speed search, the second
As shown in the figure, the rotation speed N ₁ of the drive-side shaft that winds a film with a total number of 3000 frames at high speed is almost constant from 0 frames to 3000 frames, but the rotation of the driven-side shaft that feeds the film The number N ₂ changes above and below the rotation speed N ₁ of the drive-side shaft around 1500 frames (midpoint of the film) due to changes in the winding diameter on the reel. Also, the slack of the film when the vehicle suddenly stops from high speed is represented by a curve δ. That is, from the 0th frame to the approximately midpoint of the 1500th frame, it stops under tension, and the slack increases significantly from the vicinity of the 1500th frame. In the case of films with different numbers of frames, the number of frames in the vicinity where sag occurs will vary.

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 winding diameter, the film vibrates due to the play, and when the mark m vibrates on the detector 17,
There is a serious problem in that a predetermined piece is not retrieved due to miscounting.

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, the shaft, and the backlash between the supply and take-up reels cannot be made the same, and the difference increases with different cartridge configurations, making film stop control complicated and difficult. be.

The present invention aims to solve the above-mentioned problems, and embodiments shown in the accompanying drawings will be described below.

First, let's explain about brake control.
Figure 6 shows a configuration in which the brakes are applied to the drive shaft and the driven shaft simultaneously when the desired frame mark is detected, and during the braking, the brake on the driven shaft is temporarily released for a certain period of time to cause the film to sag. .

In addition, Figures 7 to 10 show that when the mark of a desired piece is detected, the brakes are applied to the drive shaft and the driven shaft simultaneously, and when the rotation speed of the drive shaft reaches the set value during braking, the brake is applied to the driven shaft. This is a structure in which the film is temporarily released for a certain period of time to cause the film to sag.

In the block diagram of FIG. 3, signals input to a processing unit (CPU) 20 such as a microcomputer are a mark signal from a mark detector 17 and a signal from an input device 21. From the input device 21, the frame number of the desired image to be searched, the correct frame number in case of an erroneous search, etc. are input. 8 and 10 are CPU
The aforementioned reverse feed motor and forward feed motor are controlled by 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 is a control circuit that controls the brakes 12 and 13. It is.

FIG. 6 shows an example of the brake control circuit 25, in which A ₁ to A ₃ and A ₅ to _{A 7} are AND gates, and R ₁ and R _{2 are}
is an OR gate, I ₁ and I ₂ are inverters, T ₁ and T ₂ are timers, and P is a flip-flop, which operates as follows.

When a desired frame number to be searched is input to the input device 21, the CPU compares it with the previous search frame number stored and determines whether it is forward or reverse, and rotates the forward feed motor 10 or the reverse feed motor 8. let If it is a forward feed search, the motor 10 will be on the driving side and the motor 8 will be 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 a signal to the flip-flop P of the brake control circuit 25. Set brake signal 24 to ``1'' on terminal S.
send as

The output Q "1" of flip-flop P is sent to AND gate _A1 . Since the forward feed signal 22 "1" is added to the AND gate A ₁ , a signal is output from the OR gate R ₁ and the drive side motor 10
The circuit of the second brake 13 for the shaft 11 is controlled to apply the brake 13.

The output "1" of the above flip-flop P is also input to AND gate A ₃ and timer T ₁ , timer T ₁ starts operating, and its output becomes one input of AND gate A ₃ as a signal to the next AND gate A ₅ . send.
While timer T ₁ is operating, the input of timer T ₂ is set to ``0'' by inverter I <sub>1</sub> , so timer T <sub>2</sub> does not operate, so the ``1'' inverted by inverter I ₂ is input to the other side of AND gate A ₅ . becomes the input and the following from A ₅
Send a signal to one input of _A6 .

Since the forward feed signal 23 is input to the other input of the AND gate _A6 , 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
Multiply at the same time as 3.

When the timer _T1 turns off after the set time _T1 , the timer _T2 starts operating by the inverter _I1 and outputs "1". The "0" inverted by the inverter _I2 is input to one side of the AND gate _A5 , and the output of the AND gate _A5 becomes "0" for the set time _T2 of the timer _T2 , so the driven brake 12 is turned off. timer
When T ₂ is turned off, "1" is input to AND gate A ₅ and the driven brake 12 is operated again.

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

For backward-feeding searches, use the AND gate.
“1” is input to A ₂ and A ₇ as a reverse feed signal 23 from the CPU. When "1" is sent from terminal Q by brake signal 24, the AND gate is activated as described above.
Since the output of _A5 is input to AND gate _A2 ,
As a driven side, the brake 13 is turned on for the time set by timer _T1 , turned off for the time set by timer _T2 , and operates again. Since the output Q of the flip-flop P 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.

Reset signal 30 to terminal R of flip-flop P
The brakes will operate until you input The reset signal may be sent in conjunction with the start of the next search operation.

As mentioned above, when searching microfilm at high speed and stopping suddenly, the brakes on the drive side and the driven side are applied at the same time, and after T ₁ hour, the brake on the driven side is turned off for T ₂ hours and activated again. Therefore, 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 amplification due to play of the supply cartridge reel.

In making the lower limit of the slack larger than the maximum amplitude of vibration due to backlash in the mechanical system that occurs when the film is stopped, the amount of slack is adjusted by the driven side brake control times T ₁ and T ₂ . Therefore, even when using a cartridge reel with a different mechanical backlash or a different type of cartridge reel, it is possible to perform a high-speed search by adjusting the reel to suit each case. Furthermore, in the forward direction feed search and the reverse direction feed search, the inertial systems on the supply side and the winding side may be different, so in that case, the control times T ₁ and T ₂ 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 will vibrate due to the slack, making stopping unstable.

Therefore, it is necessary to stabilize the stop at least at the position of the mark detector 17.

Therefore, members for applying tension to the film are provided before and after the mark detector 17. As its members, the embodiment shown in FIG. The lower surfaces of the freely rotatable rollers 41 and 44 are the rollers 39, 40, and 4.
They are provided in a staggered manner below the tangent line of 2 and 43. In addition, if necessary, such rollers 39 to 4 may be installed.
No. 4 is divided into two parts so as to contact the side edge of the film outside the screen, or the part facing the screen is formed to have a small diameter so as not to contact the film.

With the above configuration, even if the film vibrates due to the above-mentioned slack formation, at the position of the mark detector 17, the staggered rollers 39, 40, 4
1, 42, 43, and 44, and the vibrations do not spread, the mark immediately stops correctly on the mark detector, and miscounts are prevented.

In the embodiment shown in FIGS. 7 to 10, when a desired piece is detected, the brake signal 24 shown in FIG. 7 is issued from the CPU 20 in FIG. 7, and the brakes are applied to the driving shaft and the driven shaft simultaneously, as in the previous example. Then, when the rotation speed of the drive shaft reaches the set value during the braking time, the brake on the driven shaft is temporarily released for a time T ₂ (27),
By applying its brakes again (28),
The brake is controlled so that the film slack δ does not become smaller than the maximum amplitude. 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.

A perforated or tooth-shaped disk 33 is attached to each shaft of the motors 8 and 10 to obtain the signal of the set rotation speed.
a, 34a, and light emitting element/light receiving element 33b, 34
Photosensors 33 and 34 consisting of 3B are provided to extract pulse signals and input them to the computer 20.

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

The output Q "1" of flip-flop P is sent to AND gate _A1 . Since the forward feed signal 22 "1" is added to the AND gate A ₁ , a signal is output from the OR gate R ₁ and the drive side motor 10
The circuit of the second brake 13 for the shaft 11 is controlled to apply the brake 13.

The output "1" of the flip-flop P is inputted to one side of the AND gate _A5 via the OR gate _R3 .
Since the set rotational speed signal 31 is "0", timer T
doesn't work. The "1" inverted by the inverter becomes one input of AND gate A ₅ and sends a signal to the next AND gate A ₆ , and A ₆ sends a signal to OR gate R ₂ with forward signal 22 . Therefore, the brake 12 on the driven side also operates simultaneously with the brake 13 described 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.
is sent to timer T, and timer T starts operating. The output "1" is inverted to "0" by the inverter, and when the AND gate A ₅ is "0", the driven brake 12 is turned off.

When the set time _T2 of the timer T expires, the driven brake 12 is activated again. brake 12,1
3 continues until the reset signal 30 is input.

That is, the operations shown in the time chart of FIG. 8 and the flow chart of FIG. 9 are performed.

For reverse feed search, AND gate A ₇
A reverse feed signal 23 and a brake signal 24 are input to the motor, and the brake 12 of the motor 8, which is now on the drive side, is continuously operated via the OR gate _R2 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 is on the driven side.
are signal 23 → A ₂ , signal 24 → R ₃ → A ₅ , T → I → A ₅
→ _A2 , the output "1" of AND gate _A2 is input to OR gate _R1 , and the brake 12 starts operating at the same time.

The rotation speed of the drive side motor 8 reaches the set value and the signal 31
The timer T operates, and the driven brake 13 is once turned off when the signals to the AND gates A ₅ and A ₂ are "0", and is operated again after a set time T ₂ .

Brake control is performed when the film is stopped as described above, and the driven side brake is temporarily suspended in consideration of physical conditions such as inertia on the supply side 1 and take-up side 7, and the form of the cartridge reel. The number of rotations of the drive motor until it stops, and its temporary pause time T ₂
By experimentally setting , film slack δ occurring on the driven side is adjusted, and the possibility of erroneous counting due to reciprocating vibration of the counting frame mark m is eliminated. In combination with the film stop position stabilizing effect of the member that applies tension to the film described above, it is possible to prevent mistakes in counting film frames as in the previous example, and improve the accuracy of this type of high-speed retrieval.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of essential 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, FIG. 6 is a brake control circuit diagram, and FIGS. 7 to 10 are diagrams of other embodiments shown in FIGS. A diagram corresponding to FIG. 6. 1 is a cartridge, 8, 10 is a motor, 12,
13 is a brake, 17 is a mark detector, 33,3
4 is a photo sensor, F is a film, m is a mark, 3
9 to 44 are members that apply tension to the film.

Claims (1)

[Claims] 1. Search for a 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 a brake to stop the film and move the film to the desired frame. In a roll film retrieval device that stops a film at an enlarged projection position, the above-mentioned brake is controlled so as to cause slack in the film stopped at the retrieval position, and members that apply tension to the film are placed on top of the film before and after the mark detector. A roll film search device characterized by being provided in a staggered manner on the bottom surface.