JPH08255391A - Reel control device - Google Patents

Abstract

PURPOSE: To perform unslacking and feed operations of a tape in a simple circuit configuration without being influenced by the variation of each tape load and the variation of each mechanical load and to prevent damage of the tape and a tape traveling system at the time of unslacking. CONSTITUTION: The system is composed of an input button 1, a microcomputer 2, a servo control circuit 3, switching power source circuit 4, a limiter circuit 5, a capstan motor 6, take-up side and supply side reel sensors 9 and 10. Thus, unslacking, take-up and feed operations of the tape without being influenced by the variation of the tape load and variations of mechanical loads are feasible, and no variations in take-up and feed times take place in each set, and the quality of improved stability can be secured between sets.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reel control device for a device using a tape, a servo control circuit for servo-controlling slack removal, rewinding and rewinding of the tape, and a voltage applied to a capstan motor. The present invention relates to a reel control device having a switching power supply circuit for switching and a limiter circuit for switching the gain of a voltage applied to a capstan motor.

[0002]

2. Description of the Related Art In the prior art, the publication number is Sho 56-378.
As described in Japanese Patent Publication No. 51, the damage of the tape and the tape running system is prevented by detecting the abnormal rotation during the reel winding operation and controlling the motor so that the speed does not increase more than a predetermined value.

[0003]

In the prior art, the motor is controlled so as not to increase the speed more than a predetermined value by detecting an abnormal rotation during a preset reel winding operation, and the circuit configuration is very complicated and is always constant. Servo control is applied,
The circuit configuration was also complicated. In this circuit, all control of tape slackening, winding, and rewinding is servo-controlled, but in order to prevent slackening of the tape that occurs during speed switching especially when servo-controlled, the capstan motor in the switching power supply is The voltage limiter is used by changing the voltage gain of the circuit that generates the voltage to be applied to the servo control state, which is an open loop. Therefore, reel control can be performed with a simple circuit configuration, and a reel control device that does not damage the tape and the tape running system can be realized.

[0004]

To achieve the above object, the present invention is achieved by constructing a system with a servo control circuit, a switching power supply circuit, a limiter circuit, a capstan motor, and a control microcomputer.

[0005]

By using the above means, control of tape slackening, rewinding, and rewinding can be realized with a simple circuit configuration without being affected by variations in individual tape loads and individual mechanical loads. Yes, it can provide protection against tape scratches during slack removal. Further, if the tapes have the same length, it is possible to provide a system in which the rewinding and rewinding time of the tape is stable.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of the reel control device system of the present invention.

Reference numeral 1 denotes an input button. When the input button is pressed, a signal from the input button is input to the microcomputer 2. Two
In the microcomputer, the presence or absence of the tape is judged by the signals of the winding-side tape end sensor 11 and the supply-side tape end sensor 12, and then the operation of the mechanism corresponding to the input button 1 is selected. When it is determined that the tape is slack, the limiter control circuit 5 outputs a pre-programmed limiter control signal so that the tape does not sag, and the servo control circuit 3 controls the tape speed so that the tape does not sag in advance. Output to servo control signal for switching in several steps. A servo control circuit 3 outputs a power supply control signal to the switching power supply circuit 4 in accordance with a servo control signal from the microcomputer 1 to control the capstan motor 6 via the power supply circuit. Reference numeral 4 denotes a switching power supply circuit, which outputs a voltage according to the switching of the power supply control signal from the servo control circuit 3 and the voltage gain of the limiter circuit 5 to the capstan motor 6. A limiter circuit 5 operates a limiter in accordance with a control signal from the microcomputer 2, switches the voltage gain of the switching power supply circuit 4, and limits the voltage applied to the capstan motor 6, so that tape slack does not occur. We are in control. A capstan motor 6 is rotated by a voltage applied from a switching power supply circuit and outputs an FG pulse to the servo control circuit 3 to be servo-controlled. Further, either the take-up reel 7 or the supply reel 8 of the mechanism is rotated. 7 is the take-up reel, 8 is
It is a reel on the supply side, and when the capstan motor 6 is rotated, it rotates by hitting the mechanical gear. A take-up reel sensor 9 detects the rotation of the take-up reel 7 and outputs it to the microcomputer 2. 10 is a supply-side reel sensor, which detects the rotation of the supply-side reel 8,
Output to the microcomputer 2. Reference numeral 11 is a winding-side tape end sensor, 12 is a supply-side tape end sensor, the input button 1 is pressed, and the microcomputer 2
Is used to determine the presence / absence of a tape when selecting an operation.

When the input button 1 is pressed and the microcomputer 2 selects either rewinding or rewinding, when the capstan motor starts to rotate, the slack removing operation is performed at the time of acceleration. There is no tape slack by switching the tape speed and using the limiter circuit together,
It is possible to run without scratching the tape. Regarding the speed of acceleration / deceleration, the microcomputer 2 calculates the ratio of the take-up reel sensor 9 and the supply-side reel sensor 10 to recognize the tape position, and the speed is switched by a preset program.

[0010]

According to the present invention, reel control without tape slack can be realized with a relatively simple circuit configuration.
Not affected by variations in the tape and mechanical load, it is effective in preventing damage to the tape and the tape running system.

[Brief description of drawings]

FIG. 1 is a block diagram of a reel control device system according to an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Input button, 2 ... Microcomputer, 3 ... Servo control circuit, 4 ... Switching power supply control circuit, 5 ... Limiter circuit, 6 ... Capstan motor, 7 ... Winding side reel, 8 ... Supply side reel, 9 ... take-up reel sensor, 10 ... supply reel sensor, 11 ... take-up tape end sensor, 12 ... supply-side tape end sensor.

Claims (3)

[Claims] 1. In a device using a tape, a servo control is performed for slack removal, rewinding, and rewinding of the tape, and switching is performed in order to prevent slack of the tape that occurs when the control speed is switched. A reel control device comprising a limiter circuit in a voltage generation circuit applied to a capstan motor in a power supply circuit. 2. The limiter circuit according to claim 1, which operates when slackening, rewinding, and rewinding the tape, controls the voltage gain of the voltage generating circuit section applied to the capstan motor in the switching power supply circuit. A reel control device characterized by having a limiter function by switching. 3. The tape speed according to claim 1, wherein the tape speed at the time of slackening, rewinding and rewinding the tape is variable, but the voltage gain switched by the limiter circuit is switched to a gain corresponding to the tape speed. A reel control device, which is capable of preventing tape slack and thereby preventing damage to the tape and the tape running system.