JPS6029964A - Magnetic tape controller - Google Patents

Abstract

PURPOSE:To prevent the damage of a tape by repeating the start and stop in a ready state where the tension is given to the tape to perform the write/read of data, and releasing the tension by a tape buffer part in a pause mode. CONSTITUTION:When a detection signal B is produced and the tape is stopped, a tape reset signal TR is supplied to an AND circuit 11b from outside. Then an output signal A2 is applied to both a timer 19 and a flip-flop 18. Thus a reverse running signal RV is supplied to a reel driving part, and the tap is reversed from the detecting position of a BOT marker for a fixed period of time set previously to the timer 19, then stopped. In the same way, a tension arm control circuit 10 is turned off by the signal T fed from the timer 19. Then the supply of a drive signal D is cut off to a motor 13 so that the tension arm to the retracting position. Therefore the tape is set under a pause state of a no-ready state. Then the signal TR is supplied again to an AND circuit 11a, and the tape is set under a ready state and started.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a magnetic tape control device for controlling starting and stopping operations of a magnetic tape.

[Technical background of the invention and its problems]

Generally, in a magnetic tape device, a magnetic tape (hereinafter simply referred to as tape) runs while repeatedly starting and stopping at high speed when writing and reading data. In such a tape running mechanism, the tape drive section and the reel drive section (consisting of drive sections for a supply reel and a take-up reel) are usually separated, and a tape buffer section is provided between them.

There are various types of this chigatsufa part, such as a tension arm type and a vacuum type.

By the way, in a magnetic tape device, when the necessary data has been written to and read from the tape, the tape is normally moved to B.
OT (Beginning of Tape)
? - The vehicle is driven in reverse until the vehicle is detected, and stopped at that location. When writing and reading data to and from the tape is started again, it is started from the detected position of the BOT marker. For this reason, when the tape is in the stopped state as described above, the tape is normally under tension and is in a state ready for driving. However, under the above conditions, if the tape is left in a resting state for a long time, the portion of the tape fed out from the supply reel onto the tape running path may be damaged due to elongation or the like. This risks causing defects in the data written to the tape. As a device capable of solving these problems, a device having an automatic tape loading (auto-threading) function has been developed, but such a device has the drawback of a complicated mechanism and an increased cost.

[Purpose of the invention]

The present invention has been made in view of the above circumstances, and its purpose is to prevent damage to the tape with a simple structure even when the tape mounted on the reel mechanism is stopped for a long time and is restarted. It is an object of the present invention to provide a magnetic tape control device that can prevent this from occurring and reliably start and stop the tape.

[Summary of the Invention] In the present invention, tension is applied to the tape buffer by turning on the tape buffer portion, and the tape is caused to travel forward to a predetermined stop position (for example, a BOT marker detection position) by the forward travel control means. When the tape is in a rest state, the tape is run in reverse from the predetermined stop position for a certain period of time by the reverse run control means, and then the tape buffer section is turned off. With such a configuration, the tension on the tape is released by the tape buffer section when the tape is in a rest state, and furthermore, when the tape is restarted, forward running is performed reliably from a predetermined position.

[Embodiments of the invention“]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing the configuration of a tension arm type magnetic tape control device according to an embodiment. In the figure, 10
A tension arm control circuit is a circuit that controls the operation of the tension arm mechanism that constitutes the tape buffer section. This tension arm control circuit 10 is an AND circuit 1
In response to the output signal 1 from 1a, the control signal C is turned on and the control signal C is output to the arm position detection circuit 12. The arm position detection circuit 12 supplies a drive signal via an antenna 7'J4 to a drive motor (for example, a reel drive motor) 13 that drives the tension arm mechanism according to the control signal C. Further, the arm position detection circuit 1 12 stops supplying the drive signal in accordance with the arm position signal P detected when the tension arm moves to a predetermined position. The AND circuit 11pr receives a tape set signal TS when starting the tape.

A select signal SE when the magnetic tape device body is selected by a computer or the like and a no-ready signal NR (“0” is a significant signal) when the tape startup is not ready are input.

The 7/1 ready signal NR is also applied to one input terminal of the NOR circuit 15 along with the AND circuit JJ'a.

The NOR circuit 15 has the other input terminal supplied with the arm position signal P via the inverter 16, and outputs the output signal R to the set terminal of the flip-flop 17. Noah circuit 1
The output signal R of No. 5 is a ready signal indicating that preparation for starting the tape is complete. The flip-frog 17 supplies a forward running signal FR for causing the tape to run forward in response to the input of the ready signal R to a reel drive unit (not shown) (consisting of drive units for a supply reel and a take-up reel).

On the other hand, the AND circuit 11b receives the select signal SE, the Chino reset signal TR used when Tezo is at rest, and the ready signal R, respectively. Furthermore, the AND circuit 11b
Detection signal B when the BOT marker on the tape is detected is input to K. This detection signal B is a signal when the tape running forward is stopped at the detection position of the BOT marker, and is applied to the reset terminal of the flip-frog 17. The output signal A2 of the AND circuit 11b is applied to the set terminal of the flip-flop 18. The flip-frog 18 supplies the reel drive unit with a Su-Coos running signal Rv for causing the 0 Tezo to run in reverse in response to the input of the signal A2. Further, the output signal A2 of the AND circuit 11b is output to the timer 19. The timer 19 outputs an output signal T to the tension arm control circuit 10 after a certain period of time in response to the input of the signal A2, and turns off the operation of the tension arm control circuit 10. Further, the timer 19 outputs the output signal T to the reset terminal of the flip-flop 18 to stop supplying the reverse running signal RV.

The operation of the magnetic tape control device configured as described above will be explained. First, assume that the tape is mounted on a reel mechanism consisting of a supply reel and a take-up reel. At this point, no tension is applied to the tape, and data is not ready to be written or read from the tape. When the tape set signal TS and the select signal SE are applied to the AND circuit 11a from the outside (for example, a computer), an output signal of 1 is applied to the tension arm control circuit 10 from the AND circuit IIm. As a result, the tension arm control circuit 10 is turned on and outputs a control signal C to the arm position detection circuit 12 for driving the tension arm of the tenopuffer section. The arm position detection circuit 12 supplies a drive signal to a motor 13 that drives the tension arm. Driven by the motor 13, the tension arm is moved to a position where tension can be applied to the tape. When the tension arm moves to a predetermined position (a position where sufficient tension can be applied to the tape), a position detection signal P is provided to the arm position detection circuit 12. As a result, for example, the motor (i.e., reel drive motor) 13
Back tension is generated and the tension arm is stopped at a predetermined position. Further, the position detection signal P is applied to one input terminal of the NOR circuit 15 via the inverter 16. The NOR circuit 15 receives the no-ready signal NR (rOJ) at its other input terminal, and outputs the ready signal R upon receiving the inverted signal of the signal P. That is, tension is applied to the tape, allowing data to be written and read from the tape. When the ready signal R is applied to the set terminal of the flip-flop 7'J7, the forward running signal FR is supplied from the flip-flop 17 to the reel drive section.

As a result, the tape is moved forward to the position where the BOT marker is detected and then stopped. That is, the tape is run forward until the detection ratio signal B of the BOT marker is generated and supplied to the reset terminal of the flip float f17.

Next, when the detection signal B is generated and the tape is stopped, the tape is still in a ready state and tension is applied.

At this time, when the chip reset signal TR is supplied from the outside to the AND circuit 11b, the output signal A2 is supplied from the AND circuit 11b to both the timer 19 and the fritz float f18. As a result, the reverse running signal RV is supplied from the flip-flop 18 to the reel drive section, so that the tape is run in reverse from the detection positions of the BO and T markers. The timer 19 resets the flip-flop 18 after a certain period of time in response to the input of the signal A2. In this case, the tape is run in reverse for a certain period of time preset in the timer 19 and then stopped. Similarly, a signal T is applied from the timer 19 to the tension arm control circuit 10. In response to the input of this signal T, the tension arm control circuit 10 is turned off and the supply of the drive signal to the motor 13 is cut off so as to move the tension arm to the retracted position. Therefore, the tension on the tape is released and it becomes relaxed without coming off the tape running path. In other words, the tape is in a no-ready state. Then, when the tape set signal TS is supplied to the AND circuit 11th again, the above operation is repeated and the tape is brought into the ready state again and activated.

In this way, data writing and reading operations are performed by repeatedly starting and stopping the tape in a ready state where tension is applied.

And if the tape goes dormant for a long time, BOT
The vehicle is driven in reverse for a certain period of time from the marker detection position, and the tension is released. Therefore, even if the tape is left attached to the reel mechanism for a long time, it will run backwards and stop due to damage due to elongation, etc., so
Data writing and reading operations will be performed from the position of the OT marker.

In the above embodiment, a case has been described in which a tension arm type tape buffer section is used, but the present invention is not limited to this, and can also be applied to, for example, a magnetic tape device of a direct transfer type between reels.

〔Effect of the invention〕

As described in detail above, according to the present invention, even if the tape is left in a stopped state for a long time and then restarted, the control circuit with a simple configuration prevents damage to the tape and ensures that the tape is not damaged. can be started and stopped.

Therefore, data writing and reading operations on and from the tape can be performed reliably without complicating the overall configuration of the magnetic tape device.

[Brief explanation of drawings]

The figure is a block diagram showing the configuration of a magnetic chive control device according to an embodiment of the present invention. 10...Tension arm control port m, JJa. 11b...AND circuit, 12...Arm position detection circuit, 1y, 18...Fritsuzo Flotsuno, 19...Timer.

Claims (1)

[Claims] A tape buffer unit applies tension to the magnetic tape in response to a tape set signal when activating the magnetic tape mounted on the reel mechanism, and a tape buffer unit applies tension to the magnetic tape in response to a tape set signal when starting the magnetic tape attached to the reel mechanism. forward running control means for causing the magnetic tape to run forward to a stop position; and a tape buffer section for causing the magnetic tape to run in reverse from the predetermined stop position for a certain period of time in response to a tape reset signal when stopping the magnetic tape; 1. A magnetic tape control device comprising: reverse running control means for turning on the magnetic tape to release tension on the magnetic tape.