JPS6032892B2 - Magnetic tape transfer device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention involves winding a recorded master tape and an unrecorded slave tape onto a winding reel with their magnetic surfaces in close contact with each other, and applying a transfer bias ( This relates to a so-called batch winding type magnetic tape transfer device that applies a transfer magnetic field (transfer magnetic field) and transfers the master tape signal to a slave tape. The purpose of the present invention is to improve reliability when producing high-quality transfer tape remotely and easily by configuring the device to operate automatically and sequentially.

As will be explained later using drawings, the end of rewinding has conventionally been detected using a method that utilizes reflection on the surface of the winding roll (Fig. 4), a method that uses through-holes in the winding roll (Fig. 5), etc., the surface may become dirty and the reflectance may change, or the through holes may become clogged with tape particles.
This causes detection errors and causes accidents such as the tape accidentally wrapping around the posts of the running system. The purpose of the present invention is to prevent such accidents from occurring, clarify the cause of the trouble, and quickly take measures. One embodiment will be described below with reference to the drawings.

In FIGS. 1 and 2, reference numeral 1 denotes a supply reel on which a recorded master tape 2 recorded by a rotary head type magnetic recording and reproducing device is wound, and this supply reel 1 is driven by a motor 36.

Reference numeral 3 denotes a supply reel on which an unrecorded slave tape 4 is wound, and the supply reel 3 is driven by a motor 37.

5 is an air column for controlling the tape tension of the master tape 2, and the master tape 2 is sucked by a vacuum source (not shown) connected to an air suction port 6. 7
A light emitting element is attached to the air column 5, and 8 is a light receiving element, which detects the table loop position in the air column 5.
The motor 36 is controlled via the control circuit 39 to keep the table loop position in the air column 5 constant, thereby keeping the tape tension of the master tape 2 constant.

9 is an air column for controlling the tape tension of the slave tape 4, which is the same as the configuration on the master tape side.
It consists of a light-emitting element 11, a light-receiving element 12, and an air suction port.The output of the light-receiving element 12 is applied to the motor 37 via a control circuit 40, and the tape tension of the slave tape 4 is always kept constant. There is.

The respective tape tension is determined by the vacuum pressure of the vacuum source. 13 is a winding roll, and master tape 2
and slave tape 4 are wound up with their magnetic surfaces in close contact with each other.

The winding roll 13 is driven by a motor 38. 45
is a rotation detector attached to the winding reel shaft, and is composed of an encoder disk 44, a light emitting element 41, and a light receiving element 42.

A signal corresponding to the rotation speed detected by the rotation detector 45 is supplied to the control circuit 43 after the intensifier 46 is intensified. The control circuit 43 is configured to use the signal from the multiplier 46 to cause the motor 38 to rotate at a constant rate. Both tapes 2 and 4 wound on the winding reel 13 are connected to the magnetic field generator 1.
A transfer bias is applied by 8.

After the transfer is completed, each tape 2, 4 is transferred to the supply reel 1,
At this time, the audio signal of the master tape 2 is reproduced by the reproduction head 23 and re-recorded on the slave tape 4 by the recording head 25. Reference numeral 24 denotes an erasing head for erasing only the audio signal of the slave tape 4 transferred by applying a transfer bias.

14 and 15 are both tapes 2 and 4 by compressing both tapes 2 and 4.
This is a hair pressure roller for eliminating the air layer existing between the magnetic layers, ensuring good adhesion, and reducing gap loss during transfer, and is pressed against the take-up roll 13 by springs 16 and 17.

26, 27, 28, and 29 are guide posts for running the master tape 2, and 32, 33, 34, and 35 are guide posts for running the scrape tape 4.

Reference numerals 30 and 31 designate position regulating rollers for both tapes 2 and 4, which are used to wind up both tapes 2 and 4 onto the winding reel 13 after positionally regulating them.

Reference numerals 19 and 20 are a light emitting element and a light receiving element, respectively, for detecting a transparent trailer section provided at the end of the master tape 2. Similarly, 21 and 22 are light emitting elements for detecting a trailer section of the scrape tape 4. , a light receiving element, which detects the completion of winding and automatically operates the magnetic tape transfer device.

Further, to further explain FIG. 2, 50 is a roller attached to the master supply reel shaft, 51 is a brake shoe, 49 is a solenoid that operates the brake shoe, and the sequential control circuit 48 It works even with the following signals.

The brake shoe 51 is a spring (not shown) that does not contact the roller 50 while the master tape 1 is rotating, and operates the solenoid 49 when the master tape 1 is to be stopped.
1 is brought into contact with the roller 50, and a brake is applied to the master reel 1. At this time, a motor stop signal is sent to the master reel motor control circuit 39, and a motor stop signal is sent to the sequential control circuit 4.
Of course, it is sent from 8. 53 is a roller attached to the winding roll shaft, 54 is a brake shoe, and 62 is a solenoid for driving the brake shoe 54, which constitutes a brake like the master shaft.

56 is a roller attached to the scrape tape reel shaft, 57 is a brake shoe, and 55 is a solenoid, which constitute a brake in the same manner as described above.

47 is a frequency divider, which divides the output signal of the multiplier 46;
The pulse is supplied to the sequential control circuit 48 as one pulse per rotation.

Moreover, if we look at the winding roll 13 in detail, we can see that there is a slit 70 for the master tape 2 and a slit 70 for the slave tape 4 as shown in FIG.
When the tip of the master tape 1 is inserted into the slit 70, a compression rubber 72 pulled by a spring 74 is inserted.
The master tape 1 is pressed against the wall of the slit 70.

Similarly, the slave tape 4 is attached to the wall of the slit 71, and the spring 7
The pressure contact rubber 73 pulled at 5 is used for pressure contact. In this state, one end of the master tape 1 and the slave tape 4 are held and wound onto the winding wheel 13 in close contact with each other.

Conventionally, this method of stopping winding has been taken, for example, by detecting the trailer tape portion of the master tape or slave tape, but as shown in FIG. There is a method of installing an element 59 near the winding roll 13 and reflecting light on the surface of the winding roll 13 to detect that the tape is not wound, as shown in FIG. There was a method of providing 60-like slits in the loop 13 to detect whether the tape was not wrapped, but the method shown in Figure 4 alone could not be used if the light-emitting element or light-receiving element was defective or Detection errors could occur when the reel surface became dirty and the reflectance changed. Furthermore, in the method shown in FIG. 5, the element 5 shown in FIG.
8 and 59, or the slit 60 may become clogged with tape particles, and the completion of tape rewinding may not be detected.

Also, completion may be mistakenly detected during rewinding. Making such detection errors is a disadvantage for automation due to lack of reliability. The present invention aims to improve these drawbacks. In other words, the signal detected by the method shown in Figure 4 or Figure 5 above is gated only at the timing when the detection is effective, and if the signal is not detected even during the period when it should be detected, the tape This is a method of stopping the vehicle from running.

An embodiment of the present invention will be described using the drawings.

In FIG. 6, 62 is the light emitting element described in FIG. 4 or 5, and its signal is supplied to a gate circuit 67 via an intensifier 63. On the other hand, one pulse per revolution of the winding reel 13 whose frequency is divided by the divider 47 is supplied to the counter 64 and at the same time to the delay circuit 81.

The count value of the counter 64 is determined by the closing circuit 6 when winding is completed.
9 (for example, the winding completion signal from light emitting element 2 in FIG.
0 output) and is input to the latch 65 and stored. During rewinding, the counter 64 is reset by a winding start signal from the main circuit 69, and counts the number of rotations of the winding roll during rewinding. The subtractor 66 is
The operation is started by a signal from the main circuit 69 indicating that it is in the rewinding state, and even with the signal obtained by delaying the pulse signal from the frequency dividing circuit 47 by the delay circuit 81, the data in the memory latch 65 and the data in the counter 64 are read and subtracted. do. The subtraction is (latch data) - (counter data), and the difference is the following three types.

‘i- Subtraction result>a tii} 0≦subtraction result≦a Side subtraction result <0 Here, a is a set value of 1 or 2.

In the case of {i), since the tape rewinding completion pulse cannot be generated yet, the subtracter 66 sends a signal to the gate 67 to close the gate.

Therefore, even if a noise similar to a winding completion signal is accidentally input to the light emitting element 62, that signal will not be supplied to the stop command circuit 68. 'ii}, in this case, the subtracter 66 sends a gate opening signal to the gate circuit 67, and if the light emitting element 62 detects a pulse during this period, the detection signal is sent to the gate circuit 67.
7 and is supplied to a stop command circuit 68, from the stop command circuit 68 to a main sequential control circuit 69, and from 69 to motor control circuits 39, 43, and 40 as a motor stop command.

At the same time, a signal is also sent to the solenoids 49, 52, and 55, causing each motor to stop and move on to the next operation. If it is rigid, there is some kind of failure in the light emitting element, so the subtracter 6
6, a signal is immediately sent to the stop command circuit 68,
As in case (ii), the motor stops rotating.

At the same time, a signal is sent to the abnormality display circuit 80' to display an abnormality, and at the same time, a signal is sent from the abnormality display circuit 80 to the main sequential circuit 69, and all machine operations are stopped. At this time, maintenance is easy because an abnormal stop display is displayed. By adopting such a configuration, there will be no mistakes that could damage the master and the scrape tape during rewinding or at the end of rewinding, thereby improving the reliability of the machine.

It is also possible to configure the sequential control circuit using a microcomputer. In such a case, the output from the frequency divider 47 can be configured to be input to the interrupt terminal of the microcomputer, and the counter 64 can be configured to It is appropriate to use interrupt processing.

Further, the latch 65 becomes a memory within the microcomputer system, and the subtracter 66 can be performed by accumulator processing within the microcomputer. By doing as described above, the reliability during rewinding is improved, and the effect of improving the reliability of the device can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing an overview of the magnetic tape transfer device Z, Fig. 2 is a block diagram of the drive system, Fig. 3 is a plan view of the take-up reel, and Figs. 4 and 5 are respectively FIG. 6 is a side view showing an example of the completion detection means, and FIG. 6 is a block diagram showing the main part of an embodiment of the present invention. 1, 3... Supply reel, 2... Master tape, 4... Slave tape, 13... Winding reel, 18... Magnetic field generator, 45 ...... Rotation detector, 47... Frequency divider, 62... Light emitting element (rewinding completion detection means), 64... Counter, 65... Latch, 66... Subtractor (comparison means), 67... Gate circuit, 68...
...Stop command circuit. Figure 1 Figure 3 Figure 4 Figure 2 Figure 5 Figure 6

Claims (1)

[Claims] 1. A recorded master tape and an unrecorded slave tape wound on respective supply reels are wound onto the same take-up reel with their magnetic surfaces in close contact with each other, and both wound master tapes and unrecorded slave tapes are In a magnetic tape transfer device that applies a transfer magnetic field to a tape and then rewinds both tapes onto the respective supply reels, a pulse generating means generates a pulse corresponding to rotation of the take-up reel; rewinding completion detection means for detecting the completion of rewinding of both tapes and generating a pulse; and sequentially counting and storing output pulses of the pulse generating means during a period of winding both tapes onto the take-up reel. and sequentially compares the count value of the output of the pulse generating means and the stored value of the storage means during the unwinding period of both tapes from the take-up reel, and the difference between the two is equal to or less than a first predetermined value. a comparison means for generating a first pulse when the
1. A magnetic tape transfer device comprising: a stop means for stopping a rewinding operation based on a logical product of the pulse and the output pulse of the rewind completion detecting means. 2. The comparison means is a second one in which the difference between the count value of the output of the pulse generation means and the stored value of the storage means during the unwinding period of both tapes from the take-up reel is smaller than the first predetermined value.
Claim 1, characterized in that the device is configured to generate a second pulse when the voltage becomes less than a predetermined value, and the stopping means is configured to perform a stopping operation by the second pulse. The magnetic tape transfer device described in .