JPS59135634A - Magnetic transfer device - Google Patents

Abstract

PURPOSE:To enable the control of the tension on a take-up side so as to make the same approximately equal to the tension under transfer by detecting the tension on the feed side and take-up side of a mother tape when a drum is retreated from a transfer position and the mother tape is run. CONSTITUTION:The tension on a feed side is detected with a detecting pin 17 and a sensor 30, and the tension on the feed side is controlled by a tension servocontrol to T1. The tension on the take-up side is detected with a detecting pin 14 and a sensor 31. The detection is performed with respect to the load T2 by stationary friction. The detected value is removed of a disturbance component, etc. by a low-pass filter 27 and is then added to the tension value on the feed side by an adder 28. A motor 26 is controlled according to the result thereof. The tape is thus rewound always under the specified tension T1 irrespectively of a change in T2. The tension is successfully controlled in the stage of fast feeding simply by passing the output from the sensor 30 to a low-pass filter 27 and controlling a motor 26 in accordance with the output obtd. by adding said output to the output from the sensor 31.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a magnetic transfer device that performs magnetic transfer by bringing a mother tape and a copy tape into close contact with each other on a rotating drum.

BACKGROUND TECHNOLOGY AND PROBLEMS FIG. 1 shows a tape running system of a conventional magnetic transfer device. In the aspect of QOI, the rotating drums are in close contact with each other by the pressure roller (former), and the transfer head 02
), the signals recorded on the mother tape (2) are transferred to the copy tape (3). After transfer, each tape (ll
f2113) is the take-up reel 17) IR) 19
> is wound up. The reels (4) to (9) are each driven by a reel motor (not shown). The three tapes (11+21+,'11) are each applied with a tension servo on the inlet side and the outlet side of the drum (101), and a predetermined tape tension is applied. Tape (1++
2++3+ is the tension detection bin (131 (14105 input (1 (i)
The tension is detected by t (1'/) (18). These pins (I: 1 to 18, although not shown, are each provided on a known tension arm that is biased by a spring and rotatably provided. The angle of movement of this tension arm is measured by a sensor. A predetermined tension is applied to each tape by detecting the tape and controlling the roll motor according to the detection.

In such a magnetic transfer device, it is necessary to equalize the tension applied to the mother tape (2) during transfer and the tension applied to the mother tape (2) during rewinding. If these tensions are different, the degree of elongation of the tape will be different during transfer and rewinding, resulting in damage to the tape such as peeling off of the magnetic material.

Now, as shown in Figure 1, the tension of the tape (2) on the entrance side and exit side of the drum 00) during transfer is T.
, and so on. Figure 2 shows the running system when rewinding the tape (2).
has been retracted from the position at the time of transfer. In this case, a load T2 due to the detection pin (guide 09 existing between 14 Jun) (201 (2 old 221 etc.) is newly inserted.
is a load due to fixed friction and changes depending on temperature etc.

For this T2, the torque T of the motor that drives the reel (4) on the winding side is changed to T3. > It is necessary to have a relationship of T1 + T2. Therefore, the magnitude of the tension T1 during transfer will be different, causing the problem of tape damage mentioned above. In addition, even when fast forwarding the mother tape (2) with the drum (10) retracted, the load T due to the guide etc.
2 occurs and a similar problem occurs.

OBJECTS OF THE INVENTION The present invention provides a magnetic transfer device in which the tension of the mother tape during transfer is equal to the tension of the mother tape during rewinding or fast forwarding.

SUMMARY OF THE INVENTION The present invention detects the tension on the supply side and winding side of the mother tape when the drum is retracted from the transfer position and runs the mother tape, and the tension on the mother tape is detected based on the composite value of these detected values. The tension on the winding side is controlled to be approximately equal to the tension during transfer.

Embodiment FIG. 6 shows the running system of the mother tape (2) during rewinding, and the same parts as in FIG. 2 are given the same reference numerals.

In the figure, the reel (41t81) is driven by the motor (4). The tension on the supply side is detected by the cow tip output pin aη and the sensor (30). Based on this detection, the tension servo adjusts the supply side tension to T1. The tension on the winding side is detected by a detection pin (14) and a sensor 01).

This detection is performed with respect to the load T2 due to the fixed friction described above. This detected value is added to the tension value on the supply side by a low-pass filter (adder CI after removing disturbance components etc. by moisture) 81 to control the motor (26). According to the above, T1 is set by detection on the supply side,
Since T2 is corrected by the detection on the winding side, rewinding can be performed with a constant tension T1 regardless of changes in T2. In addition, skipping the fast-forwarding time, contrary to Fig. 6,
sensor (column output is passed through a low-pass filter to sensor 0
The motor (c) may be controlled by the output added to the output of 1).

FIG. 4 shows an embodiment of the circuit system shown in FIG.

In the figure, the switch (32) is closed during rewinding;
Switch C33) is closed during fast forwarding. The soft switch C'14) (35) is closed to the REW contact during rewinding, and is closed to the FF contact during fast forwarding.

During rewinding, the detection voltage of the sensor (31) and the reference voltage ■
84 is compared by a comparator (36). This comparison output is applied to an adder (371) through a low-pass filter consisting of a diode D1 and a capacitor C1 and a switch Oz, and is added to the reference voltage V82.This addition output is sent to a comparator (38j and sensor C30). This comparison output is compared with the detected voltage of switch 0 and amplifier c3.
1 to control the motor (26). At this time, the motor (25) is switched to the switch (34) by the reference voltage VS5.
) and amplifier (controlled through 4f11).

During fast forwarding, the detection voltage of sensor C30) and the reference voltage V
85 is compared with the comparator (41), and the comparison output is
The reference voltage Vs,
(!: Added. This addition output is compared with the detection voltage of the comparator (sensor 01 in 4), and this comparison output is applied to the motor (25) through the switch C341 and the amplifier (40).
control. At this time, the motor f2[i) has a reference voltage V
85.

In this case, the reference voltage vst VS2 sets T1,
Reference voltage vsa V84 sets the operating point for feeding back T2.

Effects of the Invention The tension during rewinding and fast forwarding of the mother tape can be made equal to the tension during transfer. Therefore, tape damage can be prevented regardless of temperature changes in the fixed friction T2.

[Brief explanation of drawings]

Fig. 1 is a diagram showing an example of a conventional transfer device, Fig. 2 is a diagram showing a rewinding state, Fig. 6 is a diagram showing an embodiment of the present invention, and Fig. 4 is a diagram showing an embodiment of a circuit thread. It is. In addition, in the symbols used in the drawings, (2)...
・・・・・・・・・Mother tape (31...
・・・・・・・・・Copy tape a01・・・・・・
・・・・・・・・・ Drum IJ 4XI 71 ・
・・・・・・・・・・・・Tension detection bin (25X2
0...... It is a reel motor. Agent: Masaru Saturn, Yoshio Tsune, Toshiaki Sugiura

Claims (1)

[Claims] Magnetic transfer was performed by bringing the mother tape and copy tape into close contact with each other on the circumferential surface of the drum, and at the same time, the mother tape and the copy tape were applied with a predetermined tension at the entrance and exit sides of the drum. In the magnetic transfer device, when the drum is retracted from the transfer position and the mother tape is run, the tension on the supply side and winding side of the mother tape is detected, and the tension on the winding side is detected based on the composite value of these detected values. A magnetic transfer device characterized in that the tension on the transfer side is controlled to be approximately equal to the tension during transfer.