JPS63151936A - Control device for film driving - Google Patents

Abstract

PURPOSE:To prevent a film or a driving system from being damaged or the like, to omit a mark detecting means and to easily allow the titled device to correspond to the cutting and addition of a film or a change in the feeding speed of the film by detecting a terminal position of the film without forming a specific mark on the film. CONSTITUTION:The titled control device is provided with a control means 18 for controlling the rotational driving of a take-up reel so that the feeding speed of the film is set up to a prescribed set speed, a measuring means 24 for measuring time required for the rotation of a feed reel 1 by a prescribed rotational frequency or a prescribed angle and a film drive stopping signal generating means 26 for finding out the prescribed rotation frequency of the reel or the delivering length of the film per the prescribed rotation angle based on a film setting speed signal from the control means 18 and a measured signal from a measuring means 24 and sending a film drive stopping signal to the control means 18 when the delivering length is less than a prescribed value. Consequently, the control device can be easily allowed to correspond the cutting and addition of the film or a change in the film feeding speed.

Description

Detailed Description of the Invention (Industrial Use ¥f) The present invention relates to a film drive control device that can be applied to rotary cameras, microfilm retrieval devices, etc. The present invention relates to a film drive control device that takes up a film by rotating a take-up reel and stops the rotation when the film reaches its end.

(Prior Art) In a film drive control device that controls operations such as winding and rewinding of a roll film, it is important to detect the end position of the roll film in the feeding direction and stop the roll film feeding operation. It is considered to be a control function.

Regardless of whether each frame of the roll film is searched automatically or visually, if the roll film is fed by a drive device such as a motor, this is due to user carelessness. This is because the roll film may be fed to the end due to an erroneous operation or the like. Particularly in the case of a type in which the end of the roll film is fixed to the reel rotating shaft, such excessive conveyance may cause accidents such as heat generation of the roll film driving means motor.

For this reason, various film drive control devices have been proposed in the past. A device configured to output a stop signal to the camera, or a detection means for detecting counter marks provided on each frame of the roll film, and a timer having a predetermined set time corresponding to the detection time interval of each counter mark. There is known an apparatus which is configured to determine that a frame has ended and output a stop signal to the roll film drive means when the counter mark is not detected within a predetermined detection time interval.

(Problems to be Solved by the Invention) However, according to the above devices, it is necessary to attach some kind of mark to the roll film itself, and in connection with this, there is a problem that a mark detection means must be provided. In addition, especially with the former device, there is the hassle of having to move the mark for end detection each time the roll film is cut, spliced, etc., which is extremely inconvenient in practice. In the case of the latter device, the setting time of the timer means should be changed in accordance with changes in the feed speed of the roll film, or the setting time should be adjusted to the slowest feed speed, and the end portion may be considerably longer. There was the inconvenience of having to create unnecessary play.

Therefore, the present invention has been made to solve the above-mentioned problems of the conventional example, and its purpose is to mark the end of the film wound on the supply reel without making a special mark on the film. The detection prevents damage to the film and drive system, and in addition to omitting the mark detection means, the film drive control device can easily respond to film cutting, splicing, and changes in film feed speed. It is to provide.

(Means for Solving the Problems) In order to achieve the above object, in the present invention, the film wound around the supply reel is wound up by the rotational drive of the take-up reel, and the film is stopped at a predetermined position. In the film drive control device, the control means controls the rotational drive of the take-up reel so that the film feed speed becomes a predetermined set speed, and the supply reel rotates at a predetermined number of rotations or at a predetermined angle. A measuring means for measuring the time required for this, and a film feeding length per a predetermined number of revolutions or a predetermined rotation angle of the supply reel are determined based on the film setting speed signal of the controlling means and the measuring signal of the measuring means, and the film feeding length is and film drive stop signal generating means for sending a film drive stop signal to the control means when the film drive stop signal is equal to or less than a predetermined value.

(Function) In the present invention having the above configuration, the rotational drive of the take-up reel is controlled by the control means, and the film is fed out from the supply reel at a predetermined set speed. Since the film winding diameter of the reel becomes smaller and the film feed length per predetermined rotation speed or rotation angle of the supply reel becomes less than a predetermined value, a film drive stop signal is sent from the film drive stop signal generating means to the control means. The film is fed out and the film drive stops.

(Example) The present invention will be explained below based on the illustrated example. 1st
The figure shows mechanical members of a film drive control device according to the present invention. In the figure, l is a supply reel, 2 is a roll film wound on the supply reel 1, 3, 4.5
6 is a presser roller that guides the roll film 2; 6 is a pressure plate that fixes the roll film 2 when the roll film is stopped; 7 is a presser roller that guides the roll film 2;
is a take-up reel for winding the roll film 2, and 8 is a take-up reel for winding the roll film 2;
A motor 9 rotates the reel 7, and a rewind motor 9 rewinds the roll film 2 onto the supply reel 1.

An encoder plate 11 is fixed to a shaft 10 provided on the presser roller 4, and a light emitting element (light emitting diode) 12 and a light receiving element 13 are arranged to face each other with the encoder plate 11 in between.

Also, a shaft 14 connecting the supply reel 1 and the rewinding motor 9
A fan-shaped light shielding plate 15 is fixed to the light shielding plate 15, and a light emitting element (light emitting diode) 16 and a light receiving element 17 are arranged to face each other with the light shielding plate 15 in between.

FIG. 2 shows the circuit portion of the film drive control device. In the figure, reference numeral 18 denotes a control means, which includes a speed detection section 19 consisting of the encoder plate 11, a light emitting element 12, and a light receiving element 13, a speed conversion circuit 20, and a speed control CPU.
21 and a main CPU 22. Here, the speed detection section 19 detects the feed speed of the roll film 2 by detecting the rotation of the presser roller 4 as the roll film 2 runs, and the pulse signal output from the light receiving element 13 detects the rotation of the presser roller 4 as the roll film 2 runs. It corresponds to

Further, the speed conversion circuit 20 shapes this pulse signal and converts it into a speed signal, and then converts the speed signal into a speed control CPU.
Output to 21. The speed control CPU'21 also compares this speed signal with the roll film setting speed signal sent from the main CPU 22, and if they do not match, drives the motor so that the speed corresponds to the roll film setting speed signal. A control signal is output to the circuit 23.

Further, 24 is a measuring means, which includes the light shielding plate 15 and the light emitting element 1.
6, a light receiving element 17, and a waveform shaping circuit 25 that shapes the waveform of the pulse signal output from the light receiving element 17. It measures time and uses a pulse signal (measurement signal, fourth signal) output from the waveform shaping circuit 25.
The waveform a) shown in the figure corresponds to this time.

Reference numeral 26 denotes a film drive stop signal generating means, which is composed of an integrator 27 and an analog latch circuit 28, as shown in FIG. , that is, when the length of the roll film 2 fed out per predetermined number of revolutions (predetermined rotation angle) of the supply reel 1 becomes less than a predetermined length, a film drive stop signal is output to the speed control CPU 21. do. Here, the integrator 27 integrates the roll film setting speed signal (see the waveform shown in FIG. 4), and is reset by the fall of the pulse signal output from the waveform shaping circuit 25. Further, the analog latch circuit 28 latches the output of the integrator 27 at the rising edge of the pulse signal of the waveform shaping circuit 25. The output of the integrator 27 latched by the analog latch circuit 28 (see waveform C shown in FIG. 4) corresponds to the feed length of the roll film 2. Further, the comparison circuit 29 compares the output of the integrator 27 latched by the analog latch circuit 28 with an internal reference signal (see waveform d shown in FIG. 4),
When the output of C becomes lower than the internal reference signal,
A film drive stop signal is output to the PU21.

Next, the operation of the above embodiment will be explained.

After the roll film 2 is fed out from the supply reel 1 by a feeding device (not shown) and wound around the take-up reel 7, the motor 8 is driven. Thereby, the roll film 2 is wound up by the rotational drive of the take-up reel 7. At this time,
The feed speed of the roll film 2 is controlled by the control means 18.

That is, as the roll film 2 runs, the presser roller 4
rotates, and the encoder plate 11 rotates due to the rotation of the presser roller 4, and the encoder plate 11 is rotated from the light emitting element 12.
A pulse signal corresponding to the feeding speed of the roll film 2 is outputted from the light receiving element 12 which is irradiated with light through a speed conversion circuit 20, and after being shaped by the speed conversion circuit 20 and converted into a speed signal, the speed control is performed. It is input to the CPU 21 for speed control, and is compared with the roll film setting speed signal here, and if it does not match, the speed control CPU 2L sends a signal to the motor drive circuit 2.
A control signal is output to the motor 3, and the feeding speed of the roll film 2 is varied by the motor 8.

While the feed speed of the roll film 2 is controlled in this way, the measuring means 24 measures the time (rotational speed of the supply reel 1) required for the supply reel 1 to rotate a predetermined number of rotations (predetermined rotation angle). be measured. That is, the supply reel l is rotated by the rotational drive of the take-up reel 7, and the rotation of the supply reel 1 rotates the light shielding plate 15, and the light emitting element 1 is rotated.
6 to the light receiving element 17, and the light receiving element 17 outputs a pulse signal corresponding to the rotational speed of the supply reel 1. Here, since the feed speed of the roll film 2 is controlled by the set roll film speed and is constant, as the winding diameter of the supply reel 1 becomes smaller, the rotation speed of the supply reel 1 becomes faster, and the output from the light receiving element 17 is The interval between pulse signals becomes narrower. After this pulse signal is shaped by the waveform shaping circuit 25, it is input to the film drive stop signal generating means 2B.

The film drive stop signal generating means 26 supplies signals based on the pulse signal (measurement signal) input from the measuring means 24 and the roll film setting speed signal sent from the main CPU 22 while the feed speed of the roll film 2 is being controlled. The length of the roll film 2 fed out per predetermined number of revolutions (predetermined rotation angle) of the reel l is determined and compared with an internal reference signal. That is, as shown in FIG. 4, from the fall of the first pulse signal outputted by the waveform shaping circuit 25 to the fall of the next second pulse signal (see waveform a in the figure), the integral The integrator 27 integrates the roll film setting speed signal sent from the main CPU 22, while the analog latch circuit 28 latches the output of the integrator 27 (see waveform in the figure) at the rising edge of this pulse signal.

The output of this latched integrator 27 (see waveform C in the figure) is the roll film setting speed signal ff1 (roll film setting speed and supply (product of the time required for reel 1 to rotate once).

This corresponds to the length of the roll film 2 that is fed out per rotation of the supply reel l. Here, when the winding diameter of the supply reel 1 becomes smaller (when the remaining amount becomes smaller),
Since the interval between pulse signals becomes narrower and the amount of integration of the roll film setting speed signal decreases, the output of the latched integrator 27 also decreases accordingly. The comparator circuit 29 compares the latched output of the integrator 27 with an internal reference signal (see waveform d in the same figure) every time it is input, and stops the film drive when the value falls below the internal reference signal. The signal (see waveform e in the same figure) is sent to the speed control CPU 21.
Output to. As a result, a stop signal is output to the motor drive circuit 23, and the motor 8 is stopped. Here, the internal reference signal is set as follows.
) When outputting a film drive signal when 1750+wm remains, the length intersection 0 of the outermost layer of the roll film 2 wound n times on the supply reel L is 1 = (z + (2n-1) )t
) π Also, the remaining length L at that time is = (n (ro-t) + n (n+1) t) π Therefore.

750= (n(30-0,127)+n(m+1)X
o, 127) From π, n → 8, and the feed length of roll film 2 at this time (per revolution of supply reel 1) is 1 = (30 + (2X8-1)Xo, 127)
Since π→100 mm, it is sufficient to set the internal reference signal in accordance with the output of the integrator 27 when the feed length of the roll film 2 becomes 100 mm.

Furthermore, if the internal reference signal is set corresponding to 100 mm, the motor 8 will stop when the thickness t of the roll film 2 is 7 mm and the remaining fi 550 mm, and when t is 2.5 mil, the motor 8 will stop. When the remaining fi reaches 1450 mm, the motor 8 stops.

In this example, the motor 8 automatically stops when the roll film 2 approaches the end position and the remaining amount reaches, for example, 750 mm, so the roll film 2 is not fed to the end. Even if the end of the roll film 2 is fixed to the supply reel 1, there is no risk of damage to the roll film 2 or the drive system, or heat generation of the motor 8, or other accidents.

In addition, since no special mark is provided on the roll film 2, the mark detection means can be omitted, and the roll film 2 can be cut out, added to, or
Even if the feed speed of the roll film 2 is changed, there is no need to perform any corresponding work, and the motor 8 automatically stops when the remaining amount of the roll film 2 reaches a predetermined amount.

In the above embodiment, the film drive stop signal generating means 26 is provided outside the speed control CPU 21 and the main CPU 22, but either of these CPUs 21 or 22 is provided with a roll film setting speed signal and a measuring means. If a map corresponding to 24 pulses and signals is provided, CPU2
1 or a film drive stop signal generating means 26 in the CPU 22.
It is possible to have this function.

(Effects of the Invention) The present invention has the above-described structure and operation, and it is possible to detect the end position of the film without providing a special mark on the film, thereby preventing damage to the film or drive system. In addition to omitting the mark detection means, it also eliminates the need to cut out the film.

If the film drive device is capable of easily responding to changes in the film feed speed and is equipped with a speed control function, the CPU for speed control should have the function of a film drive stop signal generation means and a measurement means added. You can easily accomplish this by simply doing so.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a mechanical part showing one embodiment of the present invention, FIG. 2 is a block diagram of the circuit part, FIG. 3 is a block diagram showing details of the film drive stop signal generating means, and FIG. It is an operation explanatory diagram. Explanation of symbols 1... Supply reel 2... Roll film 7
... Take-up reel 8 ... Motor 18 ... Control means 24 ... Measurement means 26 ... Film drive stop signal generation means Agent Patent attorney Oku 1)
Regulations 、j璽－（、－ ゛く〜 Figure 1 Figure 2 267I7
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Claims (1)

[Claims] In a film drive control device that winds a film wound around a supply reel by rotationally driving a take-up reel and stops it at a predetermined position, the winding is controlled so that the film feeding speed becomes a predetermined set speed. a control means for controlling the rotational drive of the take-up reel; a measuring means for measuring the time required for the supply reel to rotate at a predetermined number of rotations or a predetermined angle; and based on a film setting speed signal of the control means and a measurement signal of the measuring means. a film drive stop signal generating means for determining a film feed length per a predetermined rotational speed or a predetermined rotation angle of the supply reel, and transmitting a film drive stop signal to the control means when the film feed length is less than a predetermined value. A film drive control device characterized by: