JPH06349153A - Tension control device - Google Patents

Abstract

PURPOSE:To obtain stable tape tension without providing a tension lever. CONSTITUTION:Information of a winding diameter of a tape-like medium 101 to be wound around a reel 2 and to be moved at a constant speed by a tape moving means 1 is obtained by a winding diameter detecting circuit 4. An error between a frequency of a frequency generator 3 and its expected value is obtained by an error calculation circuit 10. A signal proportionate to an output of the error calculation circuit 10 is outputted by a correction torque calculation circuit 11. A signal proportionate to an output of the winding diameter detecting circuit 4 is outputted by a back torque calculation circuit 5. A synthetic signal of the back torque calculation circuit 5 and the correction torque calculation circuit 11 is outputted by an addition circuit 12. Torque is generated on a motor 7 by a driving circuit 6 based on an output of the addition circuit 12, and inherent torque fluctuation of the motor 7 is canceled. In other words, fluctuation of the tape-like medium 101 in tension is suppressed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tape tension control device in a tape running system such as a video tape recorder and an audio tape recorder.

[0002]

2. Description of the Related Art In recent years, with the progress of thinner and thinner tapes in recording / reproducing devices using tapes, higher performance control has been required. For example, the contact state between the tape and the head. In order to keep the tape even, tape tension control is essential. On the other hand, since there is a strong demand for downsizing and weight reduction of the device, a tension control device (for example, Japanese Patent Laid-Open No. 1-271953) has been proposed in which a tape tension detection sensor is not installed and the mechanism is simplified.

A conventional tension control device will be described below with reference to the drawings. FIG. 7 is a block diagram of a conventional tension control device, 2 and 108 are reels and 3
Is a frequency generator, 4 is a winding diameter detection circuit, 5 is a back torque calculation circuit, 6 and 110 are drive circuits, 7 and 109 are motors, 101 is tape, 102 and 103 are posts, and 104 is
Is a recording / reproducing head, 105 is a capstan motor, 10
6 is a speed control circuit, 107 is a pinch roller, and 111 is a winding command terminal.

FIG. 8 is a signal waveform diagram of each part of the conventional tension control device, where q is the output signal of the frequency generator 3, r is the output signal of the back torque calculation circuit 5, and T0 is generated by the motor 7. It is torque.

The operation of the tension control device constructed as above will be described below.

The tape 101 is a capstan motor 105.
It is conveyed at a constant speed by the speed control circuit 106 in a state of being sandwiched between the shaft and the pinch roller 107. At this time,
In response to the signal applied to the winding command terminal 111, the drive circuit 110 applies the winding torque to the motor 109 and the reel 10
Since the tape 8 is rotated, the tape 101 is wound on the reel 108. Further, the tape 101 is supplied from the reel 2.

On the other hand, since the frequency generator 3 outputs a signal q having a frequency proportional to the rotation speed of the reel 2, the tape 1
When the transfer speed of 01 is constant, the winding diameter detection circuit 4 detects the cycle of the output signal of the frequency generator 3 to obtain the winding diameter information of the tape 101 wound on the reel 2. The back torque calculation circuit 5 outputs a torque signal r proportional to the output of the winding diameter detection circuit 4, and the drive circuit 6 generates a torque to the motor 7 in the direction in which the feeding of the tape 101 is suppressed in accordance with the torque signal. Therefore, the tape is supplied while applying tension to the tape 101. That is, since the torque T0 proportional to the winding diameter of the tape 101 wound on the reel 2 is applied, the tension of the tape 101 at the supply end becomes almost constant, and the contact state of the recording / reproducing head 104 is kept substantially stable. .

[0008]

However, in the above structure, the tension of the tape fluctuates due to the torque fluctuation peculiar to the motor, no matter how accurately the winding diameter is detected,
Since the tape transfer speed may fluctuate due to the expansion and contraction of the tape, or the contact between the head and the tape may become unstable, use an expensive motor with few torque fluctuations peculiar to the motor.
There was a problem that the recording and reproducing performance had to be sacrificed.

In response to the above problems, an object of the present invention is to provide a tension control device for performing stable tension control with little tape tension fluctuation even if the torque fluctuation pattern is not known because of the torque fluctuation peculiar to the motor. The purpose is to provide.

[0010]

In order to achieve the above object as a first structure, a tension control device of the present invention comprises a reel around which a tape-shaped medium is wound, and a constant speed at which the tape-shaped medium is pulled out from the reel. A tape transfer means for driving the reel, a motor for driving the reel, a driving means for generating a torque corresponding to an input signal in the motor, and a rotation state detecting means for detecting a rotation speed of the motor or a time for rotating the motor by a unit angle. And a winding diameter detecting means for detecting the winding diameter of the tape-shaped medium including the reel, and an output of the winding diameter detecting means and an expected value of an output signal of the rotating state detecting means corresponding to a set transfer speed. Of the expected value output means, error calculation means for outputting an error between the output signal of the rotation state detection means and the output signal of the expected value output means, and the error calculation means A correction torque calculating means for outputting a torque signal based on a force signal, a torque setting means for outputting a predetermined torque signal in a direction for suppressing the feeding of the tape-shaped medium, an output signal of the torque setting means, and the correction torque. And a synthesizing means for adding the output signal of the computing means and transmitting it to the driving means.

In order to achieve the above object as a second structure, the tension control device of the present invention is a reel in which a tape-shaped medium is wound, and a tape which is pulled out from the reel and runs at a constant speed. Transporting means, a motor for driving the reel, a driving means for generating a torque corresponding to an input signal in the motor, a rotation state detecting means for detecting a rotation speed of the motor or a time for rotating the motor by a unit angle, and the reel. An expected value output for outputting an expected value of the output signal of the rotation state detection means corresponding to the output of the winding diameter detection means and the set transfer speed, and the winding diameter detection means for detecting the winding diameter of the tape-shaped medium including Means, error calculation means for outputting an error between the output signal of the rotation state detection means and the output signal of the expected value output means, and the rotational position of the motor. A rotational position detector, the motor 1
Storage means for storing and reproducing the output of the error calculation means in synchronization with the output of the rotational position detector for a period of rotation or more, and correction torque calculation means for outputting a torque signal based on the reproduction output signal of the storage means. And a torque setting means for outputting a predetermined torque signal in a direction to suppress the feeding of the tape-shaped medium, an output signal of the torque setting means and an output signal of the correction torque calculating means during reproduction output of the storage means. Is added and is transmitted to the drive means.

In order to achieve the above object as a third structure, the tension control device of the present invention is a reel in which a tape-shaped medium is wound, and a tape for pulling the tape-shaped medium out of the reel and running it at a constant speed. A transfer unit, a motor for driving the reel, a drive unit for generating a torque corresponding to an input signal in the motor, a transfer speed error detection unit for detecting an error in the transfer speed of the tape-shaped medium, and the transfer speed. A correction torque calculating means for outputting a torque signal based on an output signal of the error detecting means, a torque setting means for outputting a predetermined torque signal in a direction for suppressing the feeding of the tape-shaped medium, and an output signal of the torque setting means. And an output signal of the correction torque calculating means, and a synthesizing means for transmitting the added signal to the driving means.

[0013]

According to the first aspect of the present invention, the tape-shaped medium wound on the reel is transferred at a constant speed by the tape transfer means. The rotation state detecting means detects a plurality of rotation speeds or rotation times of a unit angle per one rotation of the motor. The winding diameter detecting means obtains winding diameter information of the tape-shaped medium wound on the reel. The expected value output means outputs the expected value of the output signal of the rotation state detecting means from the winding diameter information of the winding diameter detecting means and the tape transfer speed. The error calculation means detects an error between the output signal of the rotation state detection means and the output signal of the expected value output means to detect the torque fluctuation peculiar to the motor as the fluctuation of the rotation state. The correction torque calculating means outputs a torque signal for canceling the torque fluctuation peculiar to the motor based on the output signal of the error calculating means. The torque setting means outputs a predetermined torque signal. The synthesizing means adds the output signal of the torque setting means and the output signal of the correction torque computing means and transmits the result to the driving means. The drive means generates torque in the motor corresponding to the output of the combining means, and applies tension to the tape-shaped medium. In other words, since the torque fluctuation of the motor is canceled by the torque signal of the correction torque calculating means, it is possible to suppress the tension fluctuation applied to the tape-shaped medium and obtain the tension determined only by the torque signal of the torque setting means and the winding diameter of the tape-shaped medium. it can.

According to the second aspect of the present invention, the tape-shaped medium wound on the reel is transferred at a constant speed by the tape transfer means. The rotation state detecting means detects a plurality of rotation speeds or rotation times of a unit angle per one rotation of the motor. The winding diameter detecting means obtains winding diameter information of the tape-shaped medium wound on the reel. The expected value output means outputs the expected value of the output signal of the rotation state detecting means from the winding diameter information of the winding diameter detecting means and the tape transfer speed. The error calculation means detects an error between the output signal of the rotation state detection means and the output signal of the expected value output means to detect the torque fluctuation peculiar to the motor as the fluctuation of the rotation state. The storage means first stores the output of the error calculation means in synchronization with the output of the rotational position detector for a period of one rotation or more of the motor. Then, the stored signal is reproduced and output in synchronization with the output of the rotational position detector. The correction torque calculation means outputs a torque signal for canceling the torque fluctuation peculiar to the motor based on the output signal of the storage means. The torque setting means outputs a predetermined torque signal. At the time of reproduction output from the storage means, the synthesizing means adds the output signal of the torque setting means and the output signal of the correction torque calculating means and transmits the result to the driving means. The drive means generates torque in the motor corresponding to the output of the combining means, and applies tension to the tape-shaped medium. In other words, since the torque fluctuation of the motor is canceled by the torque signal of the correction torque calculating means, it is possible to suppress the tension fluctuation applied to the tape-shaped medium and obtain the tension determined only by the torque signal of the torque setting means and the winding diameter of the tape-shaped medium. it can.

According to the third aspect of the present invention, the tape-shaped medium wound on the reel is transferred by the tape transfer means at a substantially constant speed. The transfer speed error detecting means detects a change in the transfer speed of the tape-shaped medium caused by a torque change peculiar to the motor. The correction torque calculation means outputs a torque signal for canceling the torque fluctuation peculiar to the motor based on the output signal of the transfer speed error detection means. The torque setting means outputs a predetermined torque signal. The synthesizing means adds the output signal of the torque setting means and the output signal of the correction torque computing means and transmits the result to the driving means. The drive means generates torque in the motor corresponding to the output of the combining means, and applies tension to the tape-shaped medium. In other words, since the torque fluctuation of the motor is canceled by the torque signal of the correction torque calculating means, it is possible to suppress the tension fluctuation applied to the tape-shaped medium and obtain the tension determined only by the torque signal of the torque setting means and the winding diameter of the tape-shaped medium. it can.

[0016]

Embodiments 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 control device according to the first embodiment of the present invention. In FIG. 1, the same parts as those of the conventional tension control device shown in FIG. 7 are designated by the same reference numerals and the description thereof will be omitted. 1 is a capstan motor 105, a speed control circuit 106, a pinch roller 107, a reel 108, a motor 109, and a drive circuit 1
10 and a winding command terminal 111, and the tape 101
Is a tape transfer means for transferring the signal at a constant speed, 8 is a cycle detection circuit for detecting the signal cycle of the frequency generator 3, and 9 is the output of the winding diameter detection circuit 4 and the output signal of the cycle detection circuit 8 corresponding to the set transfer speed. An expected cycle arithmetic circuit that outputs an expected value,
Reference numeral 10 is an output signal of the cycle detection circuit 8 and an expected cycle calculation circuit 9
Error calculation circuit that outputs an error from the output signal of the error calculation circuit, 11 is a correction torque calculation circuit that outputs a torque signal proportional to the output signal of the error calculation circuit 10, and 12 is an output signal of the back torque calculation circuit 5 and the correction torque calculation circuit. 11 is an adder circuit for adding the output signal of 11 and transmitting to the drive circuit 6.

FIG. 2 is a signal waveform diagram of each part in the first embodiment. In FIG. 2, a is an output signal of the expected cycle calculation circuit 9, b is an output signal of the cycle detection circuit 8, c is an output signal of the correction torque calculation circuit 11, d is an output signal of the back torque calculation circuit 5, and e is addition. The output signal of the circuit 12, T1, is the torque generated by the motor 7.

The operation of the tension control device of the first embodiment constructed as described above will be described below.

The tape 101 is a capstan motor 105.
It is conveyed at a constant speed by the speed control circuit 106 in a state of being sandwiched between the shaft and the pinch roller 107. At this time, the drive circuit 110 applies the winding torque to the motor 109 in accordance with the signal applied to the winding command terminal 111.
Is rotated, the tape 101 is wound on the reel 108. Further, the tape 101 is supplied from the reel 2.

On the other hand, since the frequency generator 3 outputs a signal having a frequency proportional to the rotation speed of the reel 2, the tape 10
When the transport speed of 1 is substantially constant, the winding diameter detection circuit 4 detects the time required for one rotation of the motor 7 from the output signal of the frequency generator 3 to wind the tape 101 wound on the reel 2.
Get the winding diameter information. The back torque calculation circuit 5 outputs a torque signal d having a value B proportional to the output of the winding diameter detection circuit 4. The cycle detection circuit 8 outputs a signal b proportional to the signal cycle of the frequency generator 3. Expected cycle calculation circuit 9 is reel 2
The output signal a of the expected value A of the output signal of the cycle detection circuit 8 determined by the winding diameter of the tape 101 wound around and the transfer speed is output. The error calculation circuit 10 outputs a signal obtained by subtracting the value of the signal b from the value of the signal a. The correction torque calculation circuit 11 outputs a value proportional to the output signal of the error calculation circuit 10 as the correction torque signal c. The adder circuit 12 outputs a signal e obtained by adding the signal d and the signal c. The drive circuit 6 causes the motor 7 to generate a torque proportional to the signal e, and the tape 10
Tension 1 At this time, the inherent torque fluctuation that the motor 7 potentially has is reduced, and the total torque T1 of the motor 7 is obtained. That is, it is possible to suppress the fluctuation in tension applied to the tape 101.

As described above, in the first embodiment,
By detecting the torque fluctuation peculiar to the motor 7 as the speed fluctuation of the motor 7 and correcting the torque to the motor 7, a stable tension can be always applied, and the contact state of the recording / reproducing head 104 can be kept stable.

Next, a second embodiment of the present invention will be described with reference to the drawings. FIG. 3 is a block diagram showing the configuration of the tension control device in the second embodiment.
In FIG. 3, the same parts as those in FIG. 1 are designated by the same reference numerals and the description thereof will be omitted. 13 is a reference of the rotational position of the motor 7
A position detector that outputs one pulse signal for rotation, 14 is a low level (hereinafter abbreviated as L level) signal corresponding to a memory command, or a high level (hereinafter abbreviated as H level) corresponding to a reproduction command Is a pattern for storing and reproducing the output signal of the error calculation circuit 10 in synchronization with the output of the rotational position detector 13 according to the output of the memory reproduction command terminal 14. A storage circuit, 16 is a correction torque calculation circuit that outputs a torque signal proportional to the output signal of the pattern storage circuit 15, and 17 is a drive circuit that adds the output signal of the back torque calculation circuit 5 and the output signal of the correction torque calculation circuit 16 to drive the same. It is an adder circuit that transmits to the circuit 6.

FIG. 4 is a signal waveform diagram of each part in the second embodiment. In FIG. 4, a is an output signal of the expected period calculation circuit 9, b is an output signal of the period detection circuit 8, f is an output signal of the position detector 13, g is an output signal of the error calculation circuit 10, and h is an external input. Signal of the memory reproduction command terminal 14, i is the output signal of the pattern storage circuit 15, j is the output signal of the correction torque calculation circuit 16, k is the output signal of the addition circuit 17, and T2 is the torque generated by the motor 7. .

The operation of the tension control device of the second embodiment having the above structure will be described below.

The tape 101 is a capstan motor 105.
It is conveyed at a constant speed by the speed control circuit 106 in a state of being sandwiched between the shaft and the pinch roller 107. At this time, the drive circuit 110 applies the winding torque to the motor 109 in accordance with the signal applied to the winding command terminal 111.
Is rotated, the tape 101 is wound on the reel 108. Further, the tape 101 is supplied from the reel 2.

On the other hand, since the frequency generator 3 outputs a signal having a frequency proportional to the rotation speed of the reel 2, the tape 10
When the transport speed of 1 is substantially constant, the winding diameter detection circuit 4 detects the time required for one rotation of the motor 7 from the output signal of the frequency generator 3 to wind the tape 101 wound on the reel 2.
Get the winding diameter information. The back torque calculation circuit 5 outputs a torque signal having a value B proportional to the output of the winding diameter detection circuit 4.
The cycle detection circuit 8 outputs a signal b proportional to the signal cycle of the frequency generator 3. The expected cycle calculation circuit 9 outputs the output signal a of the expected value A of the output signal of the cycle detection circuit 8 which is determined by the winding diameter of the tape 101 wound around the reel 2 and the transfer speed. The error calculation circuit 10 outputs a signal g obtained by subtracting the value of the signal b from the value of the signal a. Here, the operation according to the state of the signal h of the memory reproduction command terminal 14 will be described.

The operation when the signal h of the memory / reproduction command terminal 14 is at the L level will be described. The pattern storage circuit 15 sequentially stores the output signal g of the error calculation circuit 10 in synchronization with the pulse of the output signal f of the position detector 13, and outputs a signal i corresponding to zero error in the signal g. The correction torque calculation circuit 16 outputs a zero-value torque signal j corresponding to the output signal i of the pattern storage circuit 15. The adder circuit 17 outputs a torque signal k obtained by adding the output value B of the back torque calculation circuit 5 and the zero value output of the correction torque calculation circuit 16. The drive circuit 6 causes the motor 7 to generate a torque proportional to the output signal k of the adder circuit 17 and applies tension to the tape 101. At this time, the total torque T2 appearing in the motor 7 fluctuates due to the inherent torque fluctuation of the motor 7, but a signal g corresponding to this fluctuation of the torque T2 is stored in the pattern storage circuit 15. It

Next, the operation when the signal h of the memory / reproduction command terminal 14 is at the H level will be described. Pattern memory circuit 1
Reference numeral 5 sequentially reproduces and outputs the memory signal i for one rotation of the motor 7 in synchronization with the pulse of the output signal f of the position detector 13. The correction torque calculation circuit 16 is the pattern storage circuit 15
Output a torque signal j proportional to the output signal i. The adding circuit 17 adds the output value B of the back torque calculating circuit 5 and the output signal j of the correction torque calculating circuit 16 to a torque signal k.
Is output. The drive circuit 6 causes the motor 7 to generate a torque proportional to the output signal k of the adder circuit 17 and applies tension to the tape 101. At this time, the inherent torque fluctuation that the motor 7 potentially has is reduced, and the total torque T2 that appears in the motor 7 becomes stable. That is, it is possible to suppress the fluctuation in tension applied to the tape 101.

As described above, in the second embodiment, the torque fluctuation peculiar to the motor 7 is detected as the speed fluctuation of the motor 7, one rotation of the motor 7 is temporarily stored, and then the motor is based on the stored value. By correcting the torque generated by No. 7, a stable tension can always be applied, and the contact state of the recording / reproducing head 104 can be kept stable.

Next, a third embodiment of the present invention will be described with reference to the drawings. FIG. 5 is a block diagram showing the configuration of the tension control device in the third embodiment.
5, the same parts as those of the conventional tension control device shown in FIG. 7 are designated by the same reference numerals, and the description thereof will be omitted. Two
0 is a speed error detection circuit that outputs an error from the target rotation speed of the capstan motor 105, 112 is a speed control circuit that drives the capstan motor 105 so as to reduce the error that the speed error detection circuit 20 outputs, and 1 is Capstan motor 105, speed error detection circuit 20, speed control circuit 112, pinch roller 107, reel 108, and motor 1
09, a drive circuit 110 and a winding command terminal 111, and a tape transfer means for transferring the tape 101 at a constant speed, and a correction torque calculation circuit 21 for outputting a torque signal proportional to the output signal of the speed error detection circuit 20. , 22 are output signals of the back torque calculation circuit 5 and the correction torque calculation circuit 2
This is an adding circuit for adding the output signal of 1 and transmitting to the drive circuit 6.

FIG. 6 is a signal waveform diagram of each part in the third embodiment. In FIG. 6, m is the speed error detection circuit 20.
, N is the output signal of the correction torque calculation circuit 21,
o is the output signal of the back torque calculation circuit 5, p is the output signal of the addition circuit 22, and T3 is the torque generated by the motor 7.

The operation of the tension control device of the third embodiment having the above structure will be described below.

The speed error detection circuit 20 detects the rotation speed error of the capstan motor 105, and the speed control circuit 112
Thereby, the rotation speed of the capstan motor 105 is kept substantially constant. Tape 101 is capstan motor 10
It is transported at a substantially constant speed while being sandwiched between the shaft of No. 5 and the pinch roller 107. At the same time, the drive circuit 110 applies a winding torque to the motor 109 to rotate the reel 108 in response to a signal applied to the winding command terminal 111, so that the tape 101 is wound on the reel 108. Also, tape 1
01 is supplied from the reel 2. At this time, the characteristic torque fluctuation of the motor 7 becomes a tension fluctuation of the tape 101, is transmitted to the capstan motor 105, and becomes a disturbance force that fluctuates the rotation speed. As described above, the speed error detection circuit 20
And the speed control circuit 112, the capstan motor 1
Reference numeral 05 maintains a substantially constant rotation speed, but the output signal m of the speed error detection circuit 20 remains fluctuated due to the influence of disturbance force. The correction torque calculation circuit 21 outputs the output signal m of the speed error detection circuit 20.
A value proportional to is output as the correction torque signal n.

On the other hand, since the frequency generator 3 outputs a signal having a frequency proportional to the rotation speed of the reel 2, the tape 10
When the transport speed of 1 is substantially constant, the winding diameter detection circuit 4 detects the time required for one rotation of the motor 7 from the output signal of the frequency generator 3 to wind the tape 101 wound on the reel 2.
Get the winding diameter information. The back torque calculation circuit 5 outputs a torque signal o having a value B proportional to the output of the winding diameter detection circuit 4. The adder circuit 22 outputs a torque signal p obtained by adding the signal o and the signal n. The drive circuit 6 causes the motor 7 to generate a torque proportional to the signal p, and applies tension to the tape 101.
At this time, the inherent torque fluctuation that the motor 7 potentially has is reduced, and the total torque T3 of the motor 7 is obtained. That is, it is possible to suppress the fluctuation in tension applied to the tape 101.

As described above, in the third embodiment,
The torque fluctuation peculiar to the motor 7 is changed to the capstan motor 10
By detecting it as a speed fluctuation of No. 5 and correcting the torque to the motor 7, a stable tension can be always applied, and the contact state of the recording / reproducing head 104 can be kept stable.

The correction torque calculation circuits 11, 16 and 21 in each of the above-described embodiments include a low-pass filter or a band-pass filter at the time of input or output, so that the same effect can be obtained even if the torque fluctuation limited to the band is canceled. Obtained and not limited to the examples.

When the reel 2 is directly connected to the rotating shaft of the motor 7 in each of the above-described embodiments, the frequency generator 3 and the position detector 13 are arranged to detect the rotating state of the reel 2. Similar effects are obtained, and the present invention is not limited to the embodiments.

In each of the above embodiments, the winding diameter detecting circuit 4, the back torque calculating circuit 5, the cycle detecting circuit 8, the expected cycle calculating circuit 9, the error calculating circuit 10, the correction torque calculating circuits 11, 16, 21 and the addition. The circuits 12, 17, and 22, the pattern storage circuit 15, the speed error detection circuit 20, and the speed control circuits 106 and 112 can be realized by software processing by a computer system capable of time management, and are not limited to the embodiments.

In each of the above embodiments, the reel 10
As an example of the method for winding the tape 101 around the tape 8, the dedicated motor 109 and its drive circuit 110 have been shown, but the reel 108 is driven by mechanically distributing the driving force of the capstan motor 105. Methods and the like are conceivable and are not limited to the examples.

In the second embodiment, the pattern storage circuit 15 is synchronized with the position detector 13 so that the motor 7
Although the example of storing and reproducing the fluctuation pattern for one rotation of is shown, the fluctuation pattern for one rotation of the motor 7 is stored and reproduced in synchronization with the output signal of the frequency generator 3 as well as the position detector 13. However, the same effect can be obtained, and it is not limited to the embodiment.

Further, in each of the above-mentioned embodiments, the winding diameter detection circuit 4 is configured to detect using the signal of the frequency generator 3. However, mechanical detection, optical detection, etc. are conceivable, and it is limited to the embodiments. Not a thing.

In the first and second embodiments, the error signal of the error calculation circuit 10 is obtained as the period error of the frequency generator 3. However, it is conceivable that the error signal is obtained as the frequency error of the frequency generator 3. However, it is not limited to the embodiment.

In the third embodiment, the output signal of the speed error detection circuit 20 is used as the speed error signal input to the correction torque calculation circuit 21, but the output of the speed control circuit and the capstan motor 105 are used. The same effect can be obtained by using the fluctuation of the flowing current as the speed error signal.
It is not limited to the embodiment.

[0045]

As described above, according to the present invention, the rotational state detecting means, the winding diameter detecting means, the expected value outputting means, the error calculating means and the correction torque calculating means are provided, or the rotating state detecting means and the winding state are provided. By providing the diameter detection means, the expected value output means, the error calculation means, the rotational position detector, the storage means and the correction torque calculation means, or by providing the transfer speed error detection means and the correction torque calculation means, the motor Even if there is a torque fluctuation peculiar to the tape, it works so as to cancel the torque fluctuation. Therefore, it is possible to suppress the tension fluctuation applied to the tape-shaped medium and always provide a stable tension. further,
It is not necessary to use a motor with uniform torque fluctuation. When the recording / reproducing head is installed, the contact state between the tape-shaped medium and the recording / reproducing head is kept stable. Further, since a stable tension can be applied, it is not necessary to install a tension detection sensor, and the device can be made smaller and lighter.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a tension control device according to a first embodiment of the present invention.

FIG. 2 is a signal waveform diagram of each part in the first embodiment.

FIG. 3 is a block diagram showing a configuration of a tension control device according to a second embodiment of the present invention.

FIG. 4 is a signal waveform diagram of each part in the second embodiment.

FIG. 5 is a block diagram showing a configuration of a tension control device according to a third embodiment of the present invention.

FIG. 6 is a signal waveform diagram of each part in the third embodiment.

FIG. 7 is a block diagram showing a configuration of a conventional tension control device.

FIG. 8 is a signal waveform diagram of each part in the conventional tension control device.

[Explanation of symbols]

 1 Tape Transfer Means 2 Reel 4 Winding Diameter Detecting Means 5 Torque Setting Means 6 Driving Means 7 Motor 8 Rotational State Detecting Means 9 Expected Value Output Means 10 Error Calculating Means 11, 16, 21 Correcting Torque Calculating Means 12, 17, 22 Combining Means 13 rotational position detector 15 storage means 20 transfer speed error detection means 101 tape-shaped medium

Claims (4)

[Claims] 1. A reel around which a tape-shaped medium is wound, a tape transfer means for pulling the tape-shaped medium out of the reel and traveling at a constant speed, a motor for driving the reel, and a torque corresponding to an input signal. A drive means for causing the motor to generate, a rotation state detection means for detecting a rotation speed of the motor or a time for rotating the motor by a unit angle, a winding diameter detection means for detecting a winding diameter of the tape-shaped medium including the reel, Expected value output means for outputting an expected value of the output signal of the rotation state detection means corresponding to the output of the winding diameter detection means and the set transfer speed, an output signal of the rotation state detection means and an output signal of the expected value output means Error calculating means for outputting an error between the tape-shaped medium and an error calculating means for outputting a torque signal based on an output signal of the error calculating means. Torque setting means for outputting a predetermined torque signal in the direction of suppressing the output, and synthesizing means for adding the output signal of the torque setting means and the output signal of the correction torque calculating means and transmitting the sum to the driving means. A tension control device that is provided and that keeps the tension of the tape-shaped medium constant. 2. A reel around which a tape-shaped medium is wound, a tape transfer means for pulling the tape-shaped medium out of the reel and traveling at a constant speed, a motor for driving the reel, and a torque corresponding to an input signal. A drive means for causing the motor to generate, a rotation state detection means for detecting a rotation speed of the motor or a time for rotating the motor by a unit angle, a winding diameter detection means for detecting a winding diameter of the tape-shaped medium including the reel, Expected value output means for outputting an expected value of the output signal of the rotation state detection means corresponding to the output of the winding diameter detection means and the set transfer speed, an output signal of the rotation state detection means and an output signal of the expected value output means An error calculation unit that outputs an error between the rotational position detector that detects the rotational position of the motor, and a rotational position detector that detects the rotational position of the motor during one or more rotations of the motor. A storage unit that stores and reproduces the output of the error calculation unit in synchronization with the output, a correction torque calculation unit that outputs a torque signal based on the reproduction output signal of the storage unit, and suppresses sending of the tape-shaped medium. Torque setting means for outputting a predetermined torque signal in a direction, and when the reproduction output of the storage means, the output signal of the torque setting means and the output signal of the correction torque calculation means are added,
A tension control device for maintaining a constant tension of the tape-shaped medium to be sent out, comprising a synthesizing means for transmitting to the driving means. 3. A reel around which a tape-shaped medium is wound, a tape transfer means for pulling out the tape-shaped medium from the reel and traveling at a constant speed, a motor for driving the reel, and a torque corresponding to an input signal. A drive unit for generating the motor, a transfer speed error detection unit for detecting an error in the transfer speed of the tape-shaped medium, a correction torque calculation unit for outputting a torque signal based on an output signal of the transfer speed error detection unit, A torque setting unit that outputs a predetermined torque signal in a direction that suppresses the feeding of the tape-shaped medium, an output signal of the torque setting unit and an output signal of the correction torque calculation unit are added, and the result is transmitted to the driving unit. And a tension control device that keeps the tension of the tape-shaped medium to be sent out constant. 4. The tension control device according to claim 1, wherein the torque setting means outputs a torque signal proportional to the winding diameter of the tape-shaped medium including the reel.