JPH04121354A - Sensitive material rewinding control device - Google Patents

Abstract

PURPOSE:To prevent an influence from being given to an exposed part of a phototypographic composing machine due to a violent shock, when a sensitive material is finished rewound, by detecting a motor current in a rewinding control part, when the sensitive material of fixed amount is finished rewound, and stopping rotation of a motor for driving a winding core. CONSTITUTION:There are provided a motor 12 for driving a winding core of rewinding a sensitive material and a rewinding detection control part 15 for monitoring a motor current, fluctuated by a load of this motor 12, to detect rewinding finished of the sensitive material of fixed amount fed into a magazine. Next, commands of setting drive voltage, rotation, stop, etc., of this motor 12 and generation of a sampling pulse after a fixed time from starting rotation of the motor 12 are performed by a control part 11 relating to the rewinding detection control part 15.

Description

Detailed Description of the Invention [Industrial Application Fields] The present invention relates to a photosensitive material roll for forcibly winding exposed photosensitive material in a laser phototypesetting machine or the like using a core in a magazine and storing the exposed photosensitive material in a magazine. This invention relates to a control device.

[Prior Art] Laser phototypesetting machines and the like use a continuous roll of photosensitive material. The exposed photosensitive material is housed in a light-shielded magazine to prevent light from entering inside. The storage of photosensitive materials into magazines is not carried out continuously; instead, a buffer area is provided in a laser phototypesetting machine, etc., where exposed photosensitive materials that are continuously fed are temporarily slackened, and the exposed photosensitive materials are stored in the buffer area. Generally, a method is used in which the used photosensitive material is left slack, and when a certain amount of slack is reached, a portion of the slack is sent to a magazine for storage.

Therefore, a fixed amount of the exposed photosensitive material is intermittently sent from the main body of the laser phototypesetting machine to the magazine at approximately regular intervals.

The exposed photosensitive material stored in the magazine as described above is removed from the magazine and the laser phototypesetting machine, and taken to an automatic developing machine, where it is developed.

From the viewpoint of work efficiency, etc., it is desired that such a magazine can accommodate as much photosensitive material as possible smoothly. As a magazine for accommodating such a large amount of photosensitive material, a magazine has been proposed in which a core inside the magazine around which the exposed photosensitive material is wound is driven by a motor to forcefully wind the material.

Figure 2 is a diagram showing the internal structure of the magazine according to Utility Application No. 2-65552 filed by the applicant of this patent. FIG. In FIG. 2, 21 is a winding core for winding the photosensitive material, 22 is a leaf spring fixed to the magazine body 23, 24 is a circular thin plate-like side plate, and 25 is a shaft that is swingable on the side plate 24 with a point 25A as a fulcrum. The supported clipper swings through an arc-shaped opening 26 provided in the side plate 24. The clipper 25 extends from one side plate 24A to the other side plate 24B to hold the winding core 21
It is constructed almost parallel to. Moreover, a plurality of rubber rings 27 are provided on the clipper 25 at approximately equal intervals. Furthermore, the clipper 25 has a pin 28 provided on the side plate 24.
It is urged in the direction of the bottle 28 by a tension spring 29 passed between the bottle 28 and the bottle 28.

In the magazine configured as described above, the tip of the photosensitive material is held between the 1st roll core and the clipper, and the 1st roll core is driven by a motor to forcibly wind up the exposed photosensitive material. When winding up photosensitive material in a magazine, the photosensitive material sent from the buffer area of a laser phototypesetting machine, etc. is temporarily slackened in the magazine, and the slackened amount of photosensitive material is wound in one winding. It uses a method of winding up with motion.

[Problem to be Solved by the Invention] Once the exposed photosensitive material is stored in a magazine such as the one shown in FIG. The developing process is performed while the photosensitive material is pulled out from the magazine by rollers on the automatic developing machine side. Therefore, if the vicinity of the leading end of the photosensitive material is strongly pinched between the winding core 21 and the clipper 25, the photosensitive material will not come out from between.

The rollers on the automatic processor side adjust the strength to the extent that it can be pulled out.

Therefore, when winding the photosensitive material around the core, the photosensitive material wraps around the core once.
If the core is rotated with a strong force before the core is completely wrapped around the core, the photosensitive material will fall out from between the core and the clipper, and there is a problem that the photosensitive material cannot be stored in the magazine.

In addition, when the winding of a certain amount of photosensitive material sent from the phototypesetting machine is completed, there is no slack in the magazine, which causes a sudden shock to the photosensitive material, and in some cases, the exposed part of the phototypesetting machine may be damaged. There is also the problem that it has an impact on

Another problem is that the winding diameter increases as the winding progresses, and the winding speed of the photosensitive material increases if the rotational speed remains the same. As a countermeasure, it is possible to detect the roll diameter with a sensor and control the rotation speed according to the result, but as mentioned above, the magazine is removed from the phototypesetting machine after storing the photosensitive material and taken to the automatic processor. Since the sensor is connected to the sensor, there are problems with electrical wiring and other connections for the sensor, making it impractical.

[Means for Solving the Problems] The present invention has been made based on the above points, and provides a photosensitive material winding control device that can wind a photosensitive material around a core and store it in a magazine in an optimal state. The purpose is to a motor that drives the motor; a winding area ratio controller that monitors the motor current that varies depending on the load of the motor to detect when winding of a certain amount of photosensitive material fed into the magazine has been completed; A control unit that issues commands such as setting, rotation, and stop of the drive voltage of the motor, and generates a sampling pulse tP after a certain period of time ΔT has elapsed from the start of rotation of the motor to the winding detection control unit. It is important to be equipped.

[Embodiment] FIG. 1 is a block diagram showing the configuration of a photosensitive material winding control device of the present invention.

In FIG. 1, reference numeral 11 is a control unit that controls the entire photosensitive material winding control device, and includes instructions for setting the motor drive voltage, forward/reverse rotation of the motor, braking, and stopping, and a winding detection control unit 1.
A motor 12 drives the core 21 of the magazine shown in FIG. 2, and is a DC motor in this embodiment. 13 is a motor driver, and an example of its circuit is shown in FIG. 3. Motor driver 1
3 is a driver that is composed of a DC motor power bridge circuit, and can operate the motor 12 in forward/reverse rotation, brake, and stop modes according to an operation command by a combination of ON and OFF of four transistors in a control circuit 13a. In this embodiment, the motor driver 13 is grounded via a resistor R instead of the ground terminal in order to perform various controls by monitoring the motor current that varies depending on the load. The terminal voltage of this resistor R is sent to a winding detection control section, which will be described later, to perform winding control.

A voltage control section 14 sets the driving voltage of the motor 12 in accordance with instructions from the control section 11 . Reference numeral 15 denotes a winding detection control section which detects the winding state of the photosensitive material and performs winding control, the details of which will be described later.

FIG. 4 is a circuit diagram showing the configuration of the winding detection control section 15. 41 is a low-pass filter that removes motor noise etc. from the motor current signal, and 42 is an AC amplifier that cuts the DC component from the low-pass filter 41, which are AC-coupled. 43 is an amplifier.

44 is an analog comparator, and 45 is a flip-flop, which in this embodiment is a D-type flip-flop.

Here, the motor current will be explained using the waveform of the motor current illustrated in FIG. When a certain amount of photosensitive material fed into a magazine is wound up by driving a winding core with a motor, a motor current as shown below is detected.

(1) If noise is constantly generated from the motor 12,
This means that minute changes in motor current are detected as load fluctuations.

(2) When the motor is started, that is, at the start of winding, a rush current flows as shown by arrow A in FIG. 5 (2) due to the load.

When the 00 winding core starts rotating, an oscillating current is generated for a certain period of time ΔT due to changes in acceleration until the rotational speed reaches a certain value.

■Until the photosensitive material goes around the winding core once, the photosensitive material is held between the winding core and the clip bar, so the force of the photosensitive material trying to come out from between them causes minute slippage, causing minute load fluctuations. A change in current occurs due to

(2) When the photosensitive material goes around the winding core more than once, it will not slip, so the photosensitive material can be wound in a taut state.

At the moment when a certain amount of photosensitive material sent from the main body of the phototypesetting machine is completely wound up, a sudden increase in load causes a large change in current as shown by arrow B in Figure 5.

As the winding diameter increases, the motor current (DC component) also increases in order to increase the motor drive voltage to cope with the increased rotational load.

As described above, in a situation where the motor current is detected due to various factors, the winding control section 15 accurately detects the motor current indicating that a certain amount of photosensitive material has been completely wound. This will be explained in detail below.

When a certain amount of photosensitive material is first sent to the magazine, the control section 11 causes the motor driver 13 to rotate in the forward direction, and the voltage control section 1
4 are given commands for the drive voltage of the motor 12, respectively.

As a result, the motor 12 starts rotating and starts winding up the photosensitive material.

The motor current signal at this time is detected by the winding detection control section 15. The detected motor current signal is first input to a low-pass filter 41, where high frequency components such as motor noise are removed.

The motor current signal from which high frequency components have been removed is sent to the AC amplifier 42.
It cuts the DC component that increases as the winding diameter increases. This makes it possible to extract only the current change of the motor 12.

Thereafter, the signal is amplified by an amplifier 43 so that even minute current changes can be detected.

The output of this amplifier 43 is connected to one input of an analog comparator 44, and is connected to a preset reference voltage V. , compared to . And “1” when exceeding the reference voltage V**v
, outputs "0" if it does not exceed.

The output of the analog comparator 44 is input to the D input of the flip-flop 45. Sampling pulses tp continuously generated by the control section 11 are input to the clock input of the flip-flop 45 . However, as described above, an oscillating current occurs for a certain period of time ΔT after the motor 12 starts rotating, and in the present invention, the control unit 1.1 starts generating the sampling pulse t after a certain period of time ΔT has elapsed after the start of motor rotation, as shown in FIG.

As described above, changes in the motor current as the motor rotates are continuously detected.

At the moment when winding of the photosensitive material is completed, a motor current signal as shown by the ω arrow B in FIG. 5 is detected, and the signal input to the analog comparator 44 exceeds the reference voltage v1 is output as “1” and input to the flip-flop 45. In the flip-flop 45, the input “1” is the sampling pulse tp.
When the receiver is removed, the flip-flop 45 sends a winding completion signal "1" to the control section 11.

The control unit 11 immediately gives a command to the motor driver 13 to stop the rotation of the motor 12, thereby stopping the rotation of the motor 12. At the same time, the control unit 11 operates the flip-flop 45
is reset to prepare for winding of the first photosensitive material.

A certain amount of photosensitive material fed into the magazine in the manner described above is wound up without any inconvenience.

Next, control of the photosensitive material winding time per one time from the start to the end of winding of the photosensitive material will be explained.

In order to wind up a certain amount of photosensitive material fed into a magazine every certain time without any inconvenience, the rotation 12 of the motor is controlled so that a certain amount of photosensitive material is wound up in a certain time, regardless of the size of the diameter of one roll. Therefore, in this embodiment, the following control is performed.

First, the control unit 11 determines that the output of the flip-flop 45 does not become "1" within the maximum permissible rotation time TM (an appropriate value is set in advance) of the motor 12 per winding of the photosensitive material (that is, when a certain amount of the photosensitive material is If the entire photosensitive material is not wound up, the rotation of the motor 12 is stopped after the elapse of time T1, and the next feeding of the photosensitive material is waited.

Then, in the next winding, the control unit 11 increases the drive voltage of the motor 12 by a preset amount, increases the rotational speed of the motor, and winds the photosensitive material.

If you cannot wind up the TM waiting time in this way.

During the next feed, the motor drive voltage is gradually increased to increase the winding speed. When it is detected that the output of the flip-flop 45 becomes "1" within the TM time, the motor 12 is immediately stopped and winding is stopped. At this time, it is determined that the drive voltage of the motor 12 is high, and the voltage is lowered a little.

In this way, the drive voltage of the motor 12 is increased or decreased so that the TM waiting time sensitive material can be wound at all times.

By performing the above control, it is possible to wind up a certain amount of photosensitive material in a substantially constant time regardless of the size of the winding diameter.

The present invention has been described in detail above, and in the above embodiment, one winding operation is performed every time a certain amount of photosensitive material is fed from the main body of the phototypesetting machine, but the present invention is not limited to this. One winding operation may be performed for each feeding of the photosensitive material a plurality of times.

Further, in the above embodiment, the motor is rotated to start winding after the photosensitive material has been fed into the magazine, but winding of the photosensitive material may be started even during feeding.

[Effects of the Invention] As explained above, according to the present invention, when winding up the exposed photosensitive material that is intermittently sent to the magazine at approximately constant intervals from the main body of the phototypesetting machine, a certain amount of the photosensitive material is The winding control unit detects the motor current when winding is completed,
Since the rotation of the motor that drives the core is stopped, the conventional problem of a sudden shock at the end of winding the photosensitive material affecting the exposure section of the phototypesetting machine is solved.

In addition, as the amount of wound photosensitive material increases, the driving voltage of the motor is gradually increased or decreased, so that the winding of the photosensitive material is completed in approximately a certain period of time, and the photosensitive material is rotated once around the core. Before winding, since the motor is rotated at a low driving voltage, the photosensitive material does not fall out from between the winding core and the clip bar.

[Brief explanation of the drawing]

Figure 1 is a block diagram showing the configuration of the photosensitive material winding control device of the present invention, Figure 2 is a diagram showing the internal structure of the magazine according to Utility Model Application No. 2-65552, and Figure 3 is the circuit of the motor driver. FIG. 4 is a circuit diagram showing the configuration of a winding detection control section, and FIG. 5 is a diagram showing motor current, etc. 11... Control unit 12... Motor 13... Motor driver 14... Voltage control unit 15... Winding detection control unit 41... Low pass filter 42... AC amplifier 43... Amplifier 44...Analog comparator 45...Flip-flop

Claims (3)

[Claims] (1) In a photosensitive material winding control device that winds a photosensitive material that is fed into a magazine in a substantially constant amount from an output device body such as a phototypesetting machine, the device includes a motor that drives a winding core that winds the photosensitive material; A winding detection control unit that monitors the motor current that varies depending on the load and detects when winding of a certain amount of photosensitive material fed into the magazine has been completed; and a winding detection control unit that monitors the motor current that varies depending on the load and detects when winding of a certain amount of photosensitive material fed into the magazine is completed; directive,
and a control unit that generates a sampling pulse t_P after a predetermined time ΔT has elapsed from the start of rotation of the motor for the winding detection control unit. Device. (2) The winding detection control unit includes a low-pass filter that cuts high frequency components of the motor current signal, an AC amplifier that cuts the DC component, and a reference voltage V_R_E_F that is set in advance for the motor current signal.
The motor current signal is compared with the reference voltage V_R_E_F
a comparator that outputs "1" when the voltage exceeds 1, and a flip-flop that outputs a winding end signal "1" when the comparator outputs "1" and the control section outputs the sampling pulse t_P. , A photosensitive material winding control device according to claim (1), characterized by comprising: . (3) The control unit detects that the photosensitive material winding control unit has finished winding the photosensitive material within a preset maximum allowable motor rotation time per one photosensitive material winding T_M. If not, the motor is instructed to stop after the longest allowable rotation time T_M has elapsed since the start of rotation of the motor, and control is performed to increase the driving voltage of the motor when winding the next photosensitive material, regardless of the size of the winding diameter. A photosensitive material winding control device according to claims (1) and (2), characterized in that a certain amount of photosensitive material is wound up in a substantially certain period of time.