JPH06187701A - Tape running device - Google Patents

Abstract

PURPOSE:To prevent a tape form subsequently generating phenomena such as a flutter even through the large fluttering was once generated in the tape at the time of fast-forwarding and rewinding. CONSTITUTION:A VTR device 1 is provided with reel motors 8a, 8b rotationally driving a pair of tape reels 4a, 4b wound with the magnetic tape 3 and a reel motor control part 9 setting a running speed of the magnetic tape 3 to a prescribed high speed by controlling the rotational driving of these reel motors 8a, 8b. A tension detecting part 20 normally detecting a voltage signal 22a which shows the tension of the running magnetic tape 3 in voltage, and a discrimination part 30 discriminating whether the variation in tension of the magnetic tape 3 is within the allowable range or not, basing on the voltage signal 22a are also provided. When the variation in tension of the magnetic tape 3 is discriminated as to be beyond an allowable range, the reel motors 8a, 8b are controlled by the reel motor control part 9 so that the running speed of the magnetic tape 3 is reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tape running device,
For example, a VTR with high-speed fast-forward / high-speed rewind function
It is applied to the device.

[0002]

2. Description of the Related Art A VTR device is provided with a tension servo mechanism for controlling the tension of a magnetic tape of a mounted tape cassette so as to normally keep the tension within a certain range. However, even if there is such a tension servo mechanism, when performing fast-forwarding and rewinding at a speed 100 times or more higher than the normal reproduction speed, for example, a resin that constantly applies a load to the magnetic tape in the housing of the tape cassette. The tongue (made by the VHS standard tape cassette) is too hard and suddenly the tension of the magnetic tape is disturbed so much that the tension servo mechanism cannot be controlled. Occur.

[0003]

In the conventional VTR device, no measures have been taken against the large flutter generated on the magnetic tape. Therefore, if the magnetic tape is kept running at high speed even after a large flutter has occurred,
Not only did the loud fluttering reoccur and the unpleasant sound continued, but in the worst case, the magnetic tape could come off the running path, causing tape damage.

[0004]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems by providing a drive unit for rotationally driving a pair of tape reels around which a tape is wound, and controlling the rotational drive of the drive unit to control the drive unit. A tape traveling device comprising a control unit for setting the traveling speed of a tape to a predetermined high speed, wherein the detecting means for constantly detecting the tension information of the tape during traveling and the tension information obtained by the detecting means. On the basis of the above, a discriminating means for discriminating whether or not the tension fluctuation of the tape is within an allowable range, and when the discriminating means judges that the tape tension fluctuation is outside the permissible range, the traveling speed of the tape is determined. The tape traveling device is characterized in that the control unit controls the driving body so that the speed is lower than the predetermined high speed.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of a VTR device according to the present invention, FIG. 2 is a characteristic diagram for explaining a discriminating operation by a discriminating unit, FIG. 3 is a block diagram showing another example of the discriminating unit, and FIG. FIG. 4 is a characteristic diagram for explaining a discriminating operation by the discriminator shown in FIG. 3.

The VTR device (tape running device) shown in FIG.
1 is a state in which the tape cassette 2 is mounted. The tape cassette 2 has a structure in which a pair of tape reels 4a and 4b around which a magnetic tape (tape) 3 is wound are housed in a cassette housing 5. In the mounted state, the magnetic tape 3 is a VTR.
A tape as shown in the drawing, which is pulled out by the loading members 6a, 6b, 6c on the apparatus 1 side and a tension pole 21b of a tension arm 21 which will be described later, and is wound around a rotary body 7 having a magnetic head for recording / reproducing at a predetermined angle. Forming a path.

The VTR device 1 is equipped with reel motors (driving bodies) 8a and 8b for rotationally driving the tape reels 4a and 4b of the tape cassette 2. Further, the reel motor control unit (control unit) is arranged so that the rotational drive of the reel motors 8a and 8b can be controlled to set the traveling speed of the magnetic tape 3 variously in response to recording / reproducing, fast-forwarding, rewinding, and the like.
9 and a reel motor drive unit 10. The control signals 9a, 9b output from the reel motor control unit 9 are converted into drive signals 10a, 10b via the reel motor drive unit 10, and the rotation drive of the reel motors 8a, 8b is controlled by the drive signals 10a, 10b. can do. For example, at the time of fast-forwarding and rewinding, the drive speed of the reel motors 8a and 8b is higher than that at the time of recording and reproducing, and the magnetic tape 3 runs at high speed in the A and B directions, respectively.

Further, the VTR device 1 includes a magnetic tape 3
Considering the large rattling that occurs during high-speed running, the tension detection unit (detection means) 20 that constantly outputs a voltage signal (tension information) 22a that represents the tension of the magnetic tape 3 during running as a voltage value, and the voltage signal thus obtained. 22
Based on a, a discriminating unit (discriminating means) 30 for discriminating whether or not the tension fluctuation of the magnetic tape 3 is within the allowable range is provided.

The tension detecting section 20 is composed of a tension arm 21 and a Hall element 22 using a magnetic member. The tension arm 21 is swingable around a shaft 21a as a fulcrum, and has a tension pole 21b around which the magnetic tape 3 is wound. The tension arm 21 is biased in the clockwise direction (the direction in which the magnetic tape 3 is wound) by the spring member g. A Hall element 22 that constantly outputs a voltage value corresponding to the strength of the magnetic field is arranged near the tension arm 21.

When the tension detecting section 20 is constructed in this manner, the tension arm 21 swings due to the change in the tension of the magnetic tape 3 and the strength of the magnetic field around the hall element 22 changes, so that the hall element 22 tensions the magnetic tape 3. The voltage signal 22a representing the voltage value is constantly output. Then, this voltage signal 22a is applied to the tension detector 2
The output is 0 as a whole.

The discriminating section 30 discriminates whether or not the tension fluctuation of the magnetic tape 3 is within an allowable range depending on whether or not the maximum amplitude level of the voltage signal 22a exceeds a preset reference level. It is determined whether the flapping generated on the tape 3 is acceptable. This determination unit 30
Is composed of a maximum value holding unit 31, a minimum value holding unit 32, an amplitude detection unit 33, and a comparison determination unit 34 as follows.

The maximum value holding unit 31, the minimum value holding unit 32, and the amplitude detection unit 33 are for obtaining the maximum amplitude level of the voltage signal 22a. The voltage signal 22a is input to the maximum value holding unit 31 and the minimum value holding unit 32. The maximum value holding unit 31 holds the maximum value of the voltage signal 22a, and the minimum value holding unit 32 holds the minimum value of the voltage signal 22a. The maximum value 31a output from the maximum value holding unit and the minimum value 32a output from the minimum value holding unit 32 are input to the amplitude detection unit 33. The amplitude detector 33 takes the difference (maximum amplitude level) between the maximum value 31a and the minimum value 32a, and outputs this result. In this way, the maximum amplitude level 33a can be obtained from the amplitude detector 33. For example, as shown in FIG.
When a has changed, the maximum value holding unit 3 is reached at the time t1.
The maximum value 31a obtained from 1 is a, the minimum value 32a obtained from the minimum value holding unit 32 is b, and the maximum amplitude level obtained from the amplitude detection unit 33 is c.

The comparison / discrimination unit 34 always compares the preset reference level 35a and the maximum amplitude level 33a with each other and performs the following discrimination operation. For example, when the maximum amplitude level 33a is less than or equal to the reference level 35a, it is determined that the tension fluctuation of the magnetic tape 3 is within the allowable range, and when the maximum amplitude level 33a is larger than the reference level 35a, the magnetic tape It is determined that the tension fluctuation of 3 is outside the allowable range. When the comparison / determination unit 34 determines from the above determination operation that the tension fluctuation of the magnetic tape 3 is out of the allowable range, the comparison / determination unit 34 considers that a large flutter has occurred in the magnetic tape 3, and outputs a determination signal 34a indicating this to the reel motor control unit 9 to indicate this. Output to control terminal.

When the reel motor controller 9 receives the discrimination signal 34a, it controls the rotational drive of the reel motors 8a and 8b via the reel motor driver 10 to reduce the running speed of the magnetic tape 3. For example, at the time of fast-forwarding and rewinding, the traveling speed of the magnetic tape 3 is usually 100 times or more than that at the time of recording / reproducing, but after the discrimination signal 34a is input, the traveling speed of the magnetic tape 3 is increased. Is decelerated to about 30 times the speed during recording and reproduction. Note that a measure may be taken to temporarily increase the tape tension when decelerating the magnetic tape 3. Further, the detection of the maximum amplitude level 33a may be reset in units of time.

In this VTR device 1, it is judged whether the tension fluctuation of the magnetic tape 3 is within the allowable range or not based on the voltage signal 22a representing the tension of the magnetic tape 3 as a voltage value. When it is determined, it is considered that a large flutter has occurred on the magnetic tape 3, and the reel motor 8 is set so as to reduce the running speed of the magnetic tape 3.
Since the rotational drive of a and 8b is controlled, for example, fast-forward,
Even if a large flutter has once occurred in the magnetic tape 3 at the time of rewinding, such a phenomenon can be prevented after this. Therefore, there is an advantage that it is possible to prevent the tape from being damaged due to the unpleasant sound continuing from the traveling magnetic tape 3 or the magnetic tape 3 coming off the traveling path.

Further, since the tension detector 20 outputs a voltage signal 22a representing the tension of the magnetic tape 3 as a voltage value, the tension detector 20 and the reel are controlled by inputting this voltage signal 22a to the reel motor controller 9. A tape tension servo mechanism for controlling the tension of the magnetic tape 3 from the motor controller 9 so as to keep the tension substantially constant may be configured.

By the way, the fluctuation of the voltage signal 22a is usually relatively small (when the large fluttering does not occur in the magnetic tape 3), and when it is greatly disturbed, the amplitudes of substantially the same magnitude are generated vertically. . Therefore, it is possible to perform substantially the same determination operation with a simpler configuration without performing the determination operation after determining the maximum amplitude level of the voltage signal 22a as in the determination unit 30.

For example, the discriminating section 40 shown in FIG. 3 constantly compares the voltage value of the voltage signal 22a obtained from the tension detecting section 20 with the preset reference voltage value 41a as it is, and the tension fluctuation of the magnetic tape 3 is within the allowable range. It is determined whether or not a large flutter has occurred on the magnetic tape 3 by this.

As shown in FIG. 4, as the reference voltage value 41a, an upper limit value at which fluttering does not occur is determined in advance. When the voltage value of the voltage signal 22a is equal to or lower than the reference voltage value 41a (before time t2), the magnetic When it is determined that the tension fluctuation of the tape 3 is within the allowable range, and when the voltage value of the voltage signal 22a becomes larger than the reference voltage value 41a (immediately after time t2), the tension fluctuation of the magnetic tape 3 is within the allowable range. Determined as outside. When the determination unit 40 determines from the above determination operation that the tension fluctuation of the magnetic tape 3 is out of the allowable range, it is determined that a large flutter has occurred in the magnetic tape 3, and the determination signal 40a indicating this is given to the reel motor control unit 9 as a determination signal. Output to the control terminal of.

In the above-mentioned discriminating section 40, the upper limit value is set as the reference voltage value 41a, but it is also possible to consider an example in which the lower limit value which does not cause fluttering is set as the reference voltage value. .

In the above embodiment, the VTR
Although the present invention is applied to the device 1, the application field of the present invention is not limited to this, and a drive body that rotationally drives a pair of tape reels around which a tape is wound, and a rotational drive of this drive body are controlled. Then, the present invention can be applied to all tape running devices provided with a control unit for varying the running speed of the tape.

[0023]

As can be seen from the above description, in the tape running device according to the present invention, it is determined whether the tension fluctuation of the tape is within the allowable range based on the detected tension information, and if the allowable range is When it is determined that the tape is outside, it is considered that the tape has a large flutter, and the rotation drive of the reel motor is controlled so as to reduce the tape traveling speed. Even if it happens, this phenomenon can be prevented after this. Therefore, there is an advantage that it is possible to prevent the tape from being damaged due to the unpleasant sound continuing from the traveling tape or the tape coming off the traveling path.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a VTR device according to the present invention.

FIG. 2 is a characteristic diagram illustrating a determination operation performed by a determination unit.

FIG. 3 is a block diagram illustrating another example of a determination unit.

FIG. 4 is a characteristic diagram illustrating a determination operation by a determination unit shown in FIG.

[Explanation of symbols]

 1 VTR device (tape running device) 3 magnetic tape (tape) 4a, 4b tape reel 8a, 8b reel motor (driving body) 9 reel motor control unit (control unit) 20 tension detection unit (detection means) 22a voltage signal (tension) Information) 30, 40 Discrimination unit (discrimination means)

Claims (1)

[Claims] 1. A drive unit for rotationally driving a pair of tape reels around which a tape is wound, and a control unit for controlling the rotational drive of the drive unit to set the traveling speed of the tape to a predetermined high speed. A tape running device, which detects the tension information of the running tape at all times, and whether the tape tension fluctuation is within an allowable range based on the tension information obtained by the detecting means. A controller for driving the tape so that the tape traveling speed is lower than the predetermined high speed when the tape tension variation is outside the allowable range. A tape running device characterized by controlling a body.