JPH0452447B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a micro roll film carrier in which a desired frame can be retrieved by driving the roll film in forward and reverse directions.

BACKGROUND ART Conventionally, micro roll film carriers of this type have been developed in which the film feed speed can be switched and set by key/push operations.

Among the film feed speed switching settings mentioned above, there is no problem if you switch only the feed speed from high speed to low speed or from low speed to high speed without changing the running direction, but for example, you can instantly change the film feed speed from high speed forward to high speed reverse feed. If the switch is switched to , a shock will be applied to the film and the drive system, which may cause equipment failure or damage to the film. Conventionally, as a countermeasure against such shocks, for example, when switching from high-speed forward forwarding to high-speed reverse forwarding,
If you do not press the "STOP" key to stop the drive, you must immediately press the "FAST" key for high-speed reverse feed.
Some methods were adopted, such as creating a configuration in which the reverse drive did not occur even when the ``RVS'' key was pressed, and adding a slip mechanism to the drive system that worked during reverse operation to alleviate the shock that was applied to the film and drive system.

However, with a configuration like the previous model, in which you cannot shift to reverse drive without first pressing the "STOP" key, not only does it take time to switch, but it also takes into account inertia, so it has the disadvantage of being extremely slow to respond.

In addition, in the case of a configuration that adds a slip mechanism,
There are design difficulties such as how to set the slip input during reversal, which not only complicates the device, but also the shock during reversal driving cannot be completely eliminated, but may be mitigated. Only.

Purpose This invention solves the above-mentioned problems in conventional micro-roll film carriers in which the film feed speed is changed by key operation, and allows the film feed speed to be changed by key operation without applying shock to the film or drive system. It is an object of the present invention to provide a micro roll film carrier that can smoothly switch film feed speeds in response to changes in speed.

Embodiment An embodiment of the micro roll film carrier of the present invention will be described below with reference to FIGS. 1 to 4.

This micro roll film carrier is the third
As shown in the figure, on the operation panel 1, there is a "FAST/FWD" key 2 for high-speed forward forwarding commands, a "FAST/RVS" key 3 for high-speed reverse forwarding commands, and a "SLOW" key for low-speed forward forwarding commands. -FWD" key 4, "SLOW/RVS" key 5 for low-speed reverse feed command, and "STOP" key 6 for stop command are provided, and by selectively pressing and operating these keys. The device is adapted to switch the film feed speed, and includes a speed detection mechanism 8 shown in FIG. 1 that detects the traveling speed of the film 7, and a speed detection mechanism 8 shown in FIG. 8
The control circuit 9 shown in FIG. 2 has a function of regulating the drive to an OFF state until the traveling speed of the film 7 falls below a predetermined speed based on the detection signal.

The roll film 7 is wound around a supply reel 10 as shown in FIG. It is configured to be wound onto a take-up reel 17 driven by a winding reel 17. A rewind motor 18 is supplied to the supply reel 10, and winding and rewinding of the roll film 7 are performed by driving the rewind motor 16 and the rewind motor 18, respectively.

The speed detection mechanism 8 includes idle rollers 12 and 13.
On the other hand, for example, an encoder disc 20 fixed to the shaft 19 of the idle roller 12, and a light emitting element 21 disposed at an opposing position sandwiching the encoder disc 20.
and a light receiving element 22, and a roll film 7.
The idle roller 1 comes into contact with this as it runs.
2, the encoder disk 20 rotates, and the light emitted from the light emitting element 21 intermittently passes through the transparent windows arranged radially on the encoder disk 20, and the light receiving element 22 receives this transmitted light. A pulse signal a having a frequency proportional to the traveling speed of the roll film 7 is output. Therefore,
When the roll film 7 is running at high speed,
The frequency of the output of the light receiving element 22 is high, and conversely, the frequency becomes low when the vehicle is running at low speed.

The control circuit 9 includes a frequency-voltage conversion circuit 23 that receives the pulse signal a output from the light receiving element 22 and extracts a voltage output proportional to the frequency of the pulse signal a.
, a comparator 24 that compares the voltage output b of the frequency-voltage conversion circuit 23 with a predetermined reference voltage Vref. and obtains a judgment output c; the "FAST/FWD" key 2;
Forward forwarding command signal FWD is output by key-in operation such as "SLOW/FWD" key 4, and reverse rotation command signal is output by key-in operation of "FAST/RVS" key 3, "SLOW/RVS" key 5, etc. a flip-flop 25 that receives the sending command signal RVS; a one-shot multivibrator 26 that receives the output of the flip-flop 25;
The output of the one-shot multivibrator 26
It is received at the set input terminal S via the NOR gate 27, and the judgment output c of the comparator 24 is
a flip-flop 28 that receives the reset input terminal R, a NAND gate 29 that receives the outputs c and d of the comparator 24 and the flip-flop 28, and an H signal that is output from a control processing device (not shown) in response to the running of the roll film 7. (RUN signal) and an AND gate 30 that receives the output e of the NAND gate 29;
Accepts the output f of the gate 30, and the output f becomes H.
Depending on whether the signal is the L signal or the L signal, the next stage motor drive circuit 3
1 and a running/stopping control circuit 32 that gives a running command or a stop command. The previous forward feed command signal FWD and reverse feed command signal RVS are
It is also input to the forward rotation/reverse rotation control circuit 33, and depending on whether the input signal is FWD or RVS, a forward rotation command or a reverse rotation command is given from the forward rotation/reverse rotation control circuit 33 to the next stage motor drive circuit 31. has been done.

Next, the film speed switching operation of the micro-roll film carrier will be described using an example in which the film speed is switched from high-speed forward forwarding to high-speed reverse forwarding.

When the roll film 7 is forward-transferred at high speed (the film speed at this time is indicated by V _F in FIG. 4), the frequency of the pulse signal output from the light receiving element 22 of the speed detection mechanism 8 is large, and the frequency - Since the voltage output b of the voltage conversion circuit 23 is sufficiently higher than the reference voltage Vref., the determination output c of the comparator 24 at this time becomes an H signal. Therefore, the H signal is input to the reset input terminal R of the flip-flop 28 and one input terminal of the NAND gate 29, and the L signal output d of the flip-flop 28 in the reset state is received at the other input terminal.
The output e of the NAND gate 29 is an H signal. On the other hand, in the next stage AND gate 30,
By receiving a RUN signal, that is, an H signal corresponding to the film running state from the aforementioned control processing device (not shown) at one input terminal, and then receiving an H signal output e from the NAND gate 29 at the other input terminal. The output f of this AND gate 30
becomes an H signal corresponding to a travel command, and the next-stage travel/stop control circuit 32 continues to give a travel command to the motor drive circuit 31.

Under the above initial condition, when the "FAST/RVS" key 3 is pressed and the reverse feed command signal RVS is input, the output of the flip-flop 25 is inverted, and in synchronization with the inversion, the one-shot multivibrator 26 is activated. A pulse signal of a predetermined width is output, and this pulse signal is input to the set input terminal S of the flip-flop 28 via the NOR gate 27.
Input as a signal. As a result, the output d of the flip-flop 28 is inverted from the L signal state in the previous reset state to the H signal state. Therefore,
The output e of the NAND gate 29 is inverted to an L signal,
The output f of the AND gate 30 is inverted to an L signal corresponding to a stop command. In response to this, the next stage of driving and
The stop control circuit 32 gives a stop command to the motor drive circuit 31.

When the drive of the winding motor 16 is stopped by the above operation, the traveling speed of the roll film 7 toward the winding side rapidly decreases. Then, the level of the voltage output b of the frequency-voltage conversion circuit 24 is the reference voltage.
When the traveling speed decreases to below Vref. (the film speed corresponding to this reference voltage Vref. is indicated by Vref. in FIG. 4), the judgment output of the comparator 24 c
is inverted to an L signal, and the L signal is input to one input terminal of the NAND gate 22 and the reset input terminal R of the flip-flop 28, and the flip-flop 28 is reset and the output e of the NAND gate 29 becomes The signal is inverted again to H signal. The AND gate 30 receives the RUN signal, that is, the H signal, corresponding to the film running from the control processing device, and the H signal from the NAND gate 29, and its output f is inverted again to the H signal corresponding to the running command. In response to this, the running/stopping control circuit 32 at the next stage gives a running command to the motor drive circuit 31. On the other hand, forward/reverse rotation control circuit 3
3, when the reverse feed command signal RVS is keyed in, the command given to the next stage motor drive circuit 31 is reversed from the forward rotation command to the reverse rotation command, so this reverse rotation command and the running/stopping control described above are reversed. circuit 3
The motor drive rotation 31 receiving a running command from the rewind motor 2 drives the rewind motor 18, and the roll film 7 is rewound onto the supply reel 10.

The above is an operation when switching from a state of high-speed forward transfer to high-speed reverse transfer, but almost the same operation is performed when switching from a state of high-speed reverse transfer to high-speed forward transfer.

In this embodiment, the speed detection mechanism 8 is composed of an encoder disk 20, a light emitting element 21, a light receiving element 22, etc., and reads the film speed from the frequency of the detection pulse signal a. A power-generating tacho generator may be provided on the roller 12 to directly pick up the voltage signal as the film speed.

Effects According to the micro roll film carrier of the present invention, when a speed detection means detects the film running speed and a control signal for reversing the driving direction is input, the film running speed is set to a predetermined speed based on the detection by the speed detection means. Since it is equipped with a control means for turning off the drive at the following times, there is no shock to the film or drive system when switching the film feed speed in reverse, which can prevent damage to the film or failure of the device. Since the reverse switching can be performed instantaneously without requiring several steps of operation, it has the effect of greatly improving operability.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of the present invention, FIG. 2 is a control circuit diagram thereof, FIG. 3 is a perspective view showing an operating section thereof, and FIG. 4 is an explanatory diagram of its operation. 7...Roll film, 8...Speed detection mechanism,
9...Control circuit, 10...Supply reel, 12,1
3... Idle roller, 16... Winding motor,
17... Take-up reel, 18... Rewind motor,
20...Encoder disc, 21...Light emitting element, 2
2... Light receiving element, 23... Frequency-voltage conversion circuit, 24... Comparator, 25, 28... Flip-flop, 26... One-shot multivibrator, 29... NAND gate, 30... AND gate, 31... ...Motor drive circuit, 32... Travel/stop control circuit, 33... Forward rotation/reverse rotation control circuit.

Claims (1)

[Scope of Claims] 1. In a micro roll film carrier that searches for a desired frame by driving the roll film in forward and reverse directions, the micro roll film carrier is configured to drive the roll film in either a first direction or a second direction opposite to the first direction. a signal generating means for generating a control signal; a speed detecting means for detecting the film running speed; and a speed detecting means for turning off the drive when the signal generating means issues a control signal for reversing the driving direction while the film is running. A micro-roll film carrier comprising: control means for controlling a reversal drive to be turned on when the film running speed becomes less than a predetermined speed based on the detection of the micro-roll film carrier.