JPH07326101A - Recording and/or reproducing apparatus - Google Patents

Abstract

PURPOSE:To prevent damage of tape when a slack is generated in the tape by detecting a slack amount of tape to control unthreading operation rate and magnitude of tape winding torque. CONSTITUTION:The respective FG signals of threading motor, supply reel motor and takeup reel motor are counted and amount of rotation of each motor corresponding to the amount of tape wound is determined in a converter 15 to supply this signal to a tape slack detector 1. Amount of slack of tape is detected by a tape slack amount calculator 1a to which the amount of tape wound is supplied when the tape is not slackened geometrically. Amount of tape slack is compared with the allowable amount in the comparator to generate a threading rotating speed control signal from a rotating speed controller 2. Meanwhile, a torque controller 3 generates a winding torque control signal on the basis of the amount of detected slack and generation of tape damage occurring when the tape is slackened even during the unthreading and recording or reproducing operations.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording and / or recording apparatus having a mechanism for transporting a tape drawn from a cassette along a tape traveling path into a cassette from a traveling state position on the rotary head drum and storing the tape therein. Reproduction device

[0002]

2. Description of the Related Art Conventionally, for example, in a video tape recorder (hereinafter referred to as a VTR), etc., generally, a VTR cassette is pulled into a main body by driving a motor and a tape is pulled out from the VTR cassette along a tape running path (loading operation). (Also called an operation) and an unthreading operation (also called an unloading operation) of drawing the tape pulled out from the tape running path into the VTR cassette.
It has each function of.

During such threading and unthreading operations of the VTR, the video tape may be damaged significantly due to the malfunction of the device or the looseness of the video tape.

It is known that a malfunction of the apparatus is likely to occur when the cassette is ejected, for example. One of the causes is the looseness of video tapes. The slack in the video tape is caused by various causes. The looseness of the video tape is caused by the VTR cassette rotating up and down repeatedly, the reel in the VTR cassette rotating due to vibration during transportation in a portable machine, and the winding failure during unthreading of the video tape. VT part of the videotape
It is considered to be caused by the cause such as being left in the R body.

In order to deal with such a cause, the applicant of the present application has proposed a cassette eject device disclosed in Japanese Patent Laid-Open No. 59-33659. This cassette eject device is a reel base drive mechanism that drives one of a pair of reel bases to rotate in the tape winding direction into the cassette, and when the lock of the lock mechanism is released by the eject lever. In addition, it is equipped with a reel stand drive mechanism that is designed to rotate the reel stand to loosen the tape at a timing earlier than the unlocking timing, and when the cassette is ejected (up), the tape in the cassette is always It is designed so that it can be ejected after the looseness is removed.

[0006] The applicant of the present invention, the actual application 60-140
A recording / reproducing apparatus disclosed in Japanese Patent No. 239 is proposed. This recording / reproducing apparatus has a detecting means for detecting that the tape is slack for a certain period, a counter to which the output of the detecting means is added to count the number of times the tape is slack for a certain period, and a count value of this counter is predetermined. And a control circuit for inhibiting the operation of the tape running mode by detecting that the value has been reached.

In this way, the tape is protected from damage that may occur to the tape when the VTR cassette is ejected or when the tape is in the running mode.

During unthreading of the VTR, the tape is protected by controlling the pulling speed of the tape guide of the VTR and executing a servo program for adjusting the winding torque.
If the video tape of the VTR cassette being inserted has slack due to the execution of the servo program, the VTR calculates the amount of slack in the tape and corrects the torque corresponding to the amount of slack in the tape to protect the tape. There is also.

[0009]

By the way, the torque correction for the slack amount of the tape includes an error for each VTR because the correction information with a high degree of accuracy for the slack amount corresponding to each VTR set is not provided. However, the torque correction also has an error. Under such circumstances, when performing high-speed threading / unthreading operation in response to a user's request, for example, it is necessary to quickly loosen the tape. As a measure against such a demand, a method of winding the tape with a winding torque to which a sufficiently large torque correction amount is added can be considered. However, this winding torque contains a large torque error. This winding torque may be out of the optimum winding torque range.

Obviously, in order to wind the tape without damaging the tape, it is necessary to gently wind the tape. The torque correction during the tape winding operation (unthreading operation) is small, and the torque error is small. However, if this torque correction is too small, the tape cannot be wound rapidly. As a result, when performing high-speed threading / unthreading operation, not only is it impossible to take up the tape rapidly in response to slack in the tape, but for example, the tape take-up during the unthreading operation may not catch up with the drawing operation of the tape guide. Instead, the slackened tape may come into contact with the tape guide during the drawing operation to pull out the tape and increase the slack amount of the tape.

Therefore, the present invention has been made in view of the above situation, and when the tape is loosened, appropriate torque correction is applied to prevent the tape from being damaged. Alternatively, the object is to provide a reproducing apparatus.

[0012]

Recording and / or recording according to the present invention
Alternatively, in order to solve the above-mentioned problems, the reproducing apparatus has a mechanism that conveys and stores the tape drawn from the cassette along the tape traveling path from the traveling state position on the rotary head drum into the cassette. And / or in the reproducing device, a slack detecting unit that detects slack of the tape,
An operation control unit that controls the unthreading operation speed according to the amount of tape slack detected by the slack detection unit, and a torque control that controls the magnitude of the winding torque according to the amount of tape slack detected by the slack detection unit. It is characterized by having a part.

Here, when the amount of slack of the tape exceeds a certain value, the operation control unit switches the unthreading operation speed to a speed lower than the normal speed, and the torque control unit changes the speed to the normal torque. A control signal having a value to which the auxiliary torque is added is output.

Further, the operation control unit gradually returns the speed of the unthreading operation to the normal speed when the slack amount of the tape is smaller than a certain value and is slower than the normal unthreading operation speed. The auxiliary torque is a value corresponding to the amount of slack of the tape, and the correction torque is obtained, for example, by multiplying the amount of slack of the tape by a coefficient for converting the amount of slack of the tape into torque. This conversion factor is calculated based on numerical values obtained experimentally.

[0015]

In the recording and / or reproducing apparatus according to the present invention, the slack detecting section detects the slack of the tape, the operation control section controls the operation speed of unthreading according to the slack amount of the tape, and the torque section. By controlling the amount of winding torque according to the amount of slack in the tape, it is possible to distinguish between normal operation with no slack in the tape and abnormal time with slack in the tape, and slack in the tape occurs. The torque is corrected only when there is an abnormality to avoid the adverse effects caused during normal operation, and the drawing speed of the tape guide is adjusted.

Further, the operation control section controls the pulling speed of the tape guide as an unthreading operation in accordance with the amount of slack of the tape so as to make it slower than the normal speed, thereby further increasing the slack of the tape in an abnormal condition. The torque control unit outputs a control signal so as to generate an appropriate tape winding torque without damaging the tape, and winds the tape loose.

When the amount of slack of the tape is smaller than a certain value, the operation control section gradually returns the speed of the unthreading operation to the normal speed, so that the slack of the tape can be normally operated. Speed up the return to the state.

The auxiliary torque is a value corresponding to the amount of slack of the tape, and by using a conversion coefficient calculated from a value obtained experimentally, for example, the error of the torque supplied when the slack of the tape is larger than the allowable amount, for example. Is suppressed.

[0019]

Embodiments of the recording and / or reproducing apparatus according to the present invention will be described below with reference to the drawings. Here, in the present embodiment, an example of an unthreading operation in which the recording and / or reproducing apparatus is applied to a so-called U-loading type rotary head type video tape recorder (hereinafter referred to as VTR) will be described.

In a VTR, for example, as shown in FIG.
Output port of the system control unit 10 that controls the operation of the VTR of
The torque control signal from the gate 106 is applied to each drive circuit 11_TH,
11 _S, 11_TIs being supplied to. Drive circuit 11_THIs
Thread on the threading ring 20 (see Figure 4).
The spinning / unthreading operation
Reding motor 12_THThe drive signal is output to. Drive
Circuit 11_SIs on the supply reel (hereinafter referred to as S reel) side
S reel motor 12_SThe drive signal is output to. Also,
Drive circuit 11_TIs a take-up reel (hereinafter referred to as T reel)
U side T reel motor 12_TThe drive signal is output to.

Threading motor 12_TH, S Reelmo
Data 12_SAnd T reel motor 12 _TFor example,
Rotation that detects the amount of rotation of each motor by the sensor
Quantity detection sensor 13_TH, 13_S, 13_TIs attached
There is. Each rotation amount detection sensor 13_TH, 13_S, 13_TIs
The detected electrical signal, that is, for example, FG signals S1 and S
2 and S3 are supplied to the conversion unit 15.

The converters 15 are provided with FG signals S, respectively.
Counter circuits 15a, 15 corresponding to 1, S2, S3
b and 15c. Counter circuits 15a, 15
b and 15c are the input ports 101 of the control unit 10 for counting values.
Are supplied through.

The control unit 10 sends the signal supplied from the input port 101 to the data RAM via the data bus DB.
105. The control unit 10 includes a program ROM 102 in which other various programs are registered, and a data ROM 103 in which preset fixed data is registered.
And an operation RAM 10 used as an operation area for a program read from the program ROM 102.
4, an output port 106, and a central processing unit (hereinafter referred to as CPU) 107 that controls these various circuits.

The CPU 107 has a program ROM 10
2. The data ROM 103, the operation RAM 104 or the data RAM 105 is used to perform data processing based on the data and control information supplied via the data bus DB, and the result of this processing is output from the output port 106 via the data bus DB. is doing. CPU1 in this data
The function of 07 will be described later.

With this structure, the VTR avoids the tape damage caused by the unthreading operation of pulling the tape of the VTR cassette inserted in the main body into the VTR cassette from the tape running path.

The functional operation performed by the CPU 107 of the control unit 10 will be described with reference to the schematic functional blocks shown in FIG. In the CPU 107, a slack detecting section 1 for detecting slack of the tape, an operation control section 2 for switching control of an unthreading operation speed in accordance with the slack amount of the tape detected by the slack detecting section 1, and a slack detecting section 1 for detecting The torque control unit 3 controls the magnitude of the winding torque according to the amount of slack of the tape.

The slack detecting section 1 has counter circuits 15a, 15 of the converting section 15 via the input port 101 of FIG. 1, for example.
a tape slack amount calculation unit 1a that calculates the amount of slack of the tape based on the count values from b and 15c;
3 has a comparison unit 1b that compares the tape slack allowable value stored in advance with the calculated tape slack amount.

The tape slack amount calculation unit 1a also supplies the calculated tape slack amount data to the torque control unit 3.

The tape slack amount calculation unit 1a has, for example, a geometrical indexing method or a method of obtaining a tape withdrawal amount from a simulation result using CAD. As a geometrical indexing method, several reference positions are set in advance, and one or more return guides arbitrarily selected among the return guides reach the reference position depending on the rotation position of the threading ring. In this method, the actual amount of tape drawn out is measured by various sensors and the like.

When there is no slack in the tape, the tape slack amount calculation unit 1a geometrically loosens the tape when the rotational position of the threading ring is known because the tape is drawn into the VTR cassette along the tape guide. The tape winding amount L _t0 when there is no tape can be estimated.

Next, the tape slack amount calculation unit 1a finds the actual tape winding amount. First, in this actual tape winding amount L _t calculation, for example, as shown in FIG.
The number of records corresponding to the number obtained by dividing the maximum value of the data supplied from the counter circuit 15a to the AM 105 by N pulses is logically allocated as an array variable, and the tape withdrawal amount, which will be described later, registered in the allocated area is set. To use.

Here, the amount of tape actually pulled out is L
_t , the number P of pulses from the counter circuit 15a, the tape pull-out amount T _n stored in the record to which the pulse number P belongs, and the tape pull-out amount T _n-1 stored in the record immediately before this record. used, the amount of tape L _{t drawn, L t = {P × (} T n -T n-1) / n} + T n-1 (1) and represented. Tape slack amount calculating section 1a calculates the amount of tape L actual tape winding amount in consideration of the rotational speed of the radius and the tape reel of the winding diameter of the tape obtained from another way to _t L _t1 to this drawn.

As a result, the amount of slack ΔL _t of the tape can be obtained from ΔL _t = L _t0 −L _t1 (2). The calculation result is supplied to the comparison unit 1b. In the comparison unit 1b, for example, the data R as shown in FIG.
The slack allowance value of the tape stored in advance in the OM 103 is compared with the calculated tape slack amount ΔL _t .
The comparison unit 1b supplies an output according to the comparison result as a control signal to the rotation speed control unit 2 and the torque control unit 3, respectively.

The rotation speed control unit 2 determines the amount of tape slack ΔL.
_{When t} is larger than the allowable value, it is considered that the tape may be damaged, and the threading rotation speed control signal is output so as to reduce the rotation speed of the threading ring. Further, the rotation speed control unit 2 outputs a threading rotation speed control signal for rotating the threading ring at the normal rotation speed when the tape slack amount ΔL _t is within the allowable value range.

Next, the torque control section 3 calculates a normal torque generating section 3a which outputs a winding torque signal in response to the generation of a normal torque, and a correction amount of the winding torque amount in accordance with the slack of the tape. Correction torque calculation unit 3b, correction torque generation unit 3c that adds the amount of winding torque of normal torque generation unit 3a and correction torque calculation unit 3b, and comparison unit 1b of correction torque generation unit 3c and normal torque generation unit 3a. And a torque switching unit 3d that switches according to the output of the.

The normal torque generating section 3a outputs to the torque switching section 3 a winding torque signal as a winding torque amount when the tape has no slack. The correction torque calculation unit 3b
For example, the conversion coefficient for converting the slack amount, which is experimentally obtained in advance, and stored in the data ROM 103 into the torque amount is read out, and the slack amount of the tape supplied from the tape slack amount calculation unit 1a is multiplied by this conversion coefficient. The correction amount of the winding torque is calculated by.

The correction torque generating unit 3c adds the correction amount of the winding torque and the normal winding torque amount to give a signal of the torque correction amount corresponding to the slack of the tape, and the torque switching unit 3c.
output to d.

The torque switching section 3d includes a correction torque generating section 3c and a normal torque generating section 3 according to a signal from the comparing section 1b.
The signal from either one of a is selected. The output signal from the torque switching unit 3d is used as a winding torque control signal via the output port 106 and the threading motor 11 is driven.
It is supplied to the _TH of the drive circuit 12 _TH.

With such a functional configuration, the CPU 107
Is supplied to a drive circuit 11 _TH for rotating the threading ring to control the rotation speed of the threading ring and the winding torque of the tape to perform control according to the amount of slack of the tape.

Next, the control of the unthreading operation in this VTR will be described with reference to the flow chart of FIG. 3 and the drawing of FIG. 4 for explaining the operation of the threading ring. Here, the schematic block diagram of FIG. 1 and the functional block diagram of FIG. 2 are also referred to when necessary. When the unthreading operation starts, the process proceeds to step S10.

In step S10, the CPU 107 of FIG.
The actual amount of slack of the tape is calculated in (see the tape slack amount calculation unit 1a of the slack detection unit 1 in FIG. 2), and the calculated actual amount of slack ΔL _t and the allowable amount of slack of the tape provided as an allowable value. Is compared (see the comparing unit 1b of the slack detecting unit 1 in FIG. 2).

When the actual tape slack amount ΔL _t in the VTR is greater than or _equal to the allowable amount (No), it is determined that the tape may be damaged, and the process proceeds to step S11. In step S11, the rotation speed control unit 2 controls the threading ring 20 of FIG. 4 according to the output from the comparison unit 1b.
The rotation speed of is set to a constant low speed slower than the normal rotation speed. By controlling the rotation speed of the threading ring 20 in this manner, the threading end sensor 21
Is detected through the window region 22, the threading ring 20 is slowly rotated in the clockwise direction from the tape running state by the rotational driving of the threading motor 24. As a result, there is a time margin in the tape pull-in time until the loosened tape contacts the tape guide.

Next, in step S12, the torque control unit 3 calculates the torque correction amount, and the corrected winding torque control signal obtained by adding the correction amount and the normal torque amount is output. The torque switching unit 3d is switched according to the switching control signal from the comparison unit 1b. By performing the torque correction process in accordance with the determination result of step S10 in this way, the torque correction is applied only when the tape is slackened. Therefore, conventionally, this torque correction is applied during normal operation. It is possible to avoid the adverse effects that have occurred. As a result, correction is performed according to the amount of slack in the tape, and control is performed so that the slack in the tape can be quickly removed, and the process proceeds to step S17.

In step S10, when the tape slack amount ΔL _t is smaller than the allowable amount (Yes), it is determined that the tape is in the normal unthreading state and the step S10 is performed.
Proceed to 13. In step S13, it is determined whether the threading ring 20 of FIG. 4 is in the normal unthreading state and has a rotational speed in a normal operation. When the rotation speed of the threading ring 20 is not the normal rotation speed (No), the process proceeds to step S14. Also,
When the rotation speed of the threading ring 20 is the normal rotation speed (Yes), the process proceeds to step S15.

Here, the threading motor 24
Indicates that the rotating force of the threading motor 24 is the rotating shaft 25,
The threading ring 20 is rotated according to the rotation of the worm wheel 27 that is transmitted to the worm 26 and meshes with the worm 26. The worm 26 is provided with a shutter 28 that rotates integrally with the worm 26, and a threading FG sensor 29 detects the on / off state of light according to the unevenness of the shutter 28. The rotation speed of the threading ring 20 can be obtained from the light detection output of the threading FG sensor 29.

In step S14, control is performed so that the rotation speed of the threading ring 20 gradually approaches the normal rotation speed from a state where the rotation speed is slower than the normal rotation speed. By gradually increasing the rotation speed of the threading ring 20 from the low speed state to the normal rotation speed in a state where the loosened tape is within the slack amount within the allowable range, for example, simply protecting the tape as in the conventional case. Compared with the case where the unthreading operation is intentionally performed, the time taken along the tape guide can be shortened and the normal operation can be quickly returned.

Further, in step S15, since the unthreading operation is normally performed, the operation is continued at this rotation speed as it is, and the process proceeds to step S16. In step S16, the tape is wound with normal torque, and the process proceeds to step S17.

In step S17, it is determined whether or not this unthreading operation has been completed. The end of this unthreading operation is determined by whether or not the unthreading end sensor 23 shown in FIG. 4 is turned on. When the unthreading operation is not completed (No), the process returns to step S10 and the above-described control is repeated. When the unthreading operation is completed (Yes), the process proceeds to step S18.

In step S18, it is determined whether or not the winding of the tape into the VTR cassette 16 is actually completed. When the winding of the tape into the VTR cassette 16 is not actually completed (No), the process returns to step S10 and the unthreading operation is repeated. When the tape is completely stored in the VTR cassette 16 (Yes
s), this routine is ended. For example, after this, VTR
The cassette compartment of the cassette 16 is controlled and ejected from the VTR main body.

With the above configuration, the slack detecting section detects the slack of the tape, the operation control section controls the operation speed of the unthreading according to the slack amount of the tape, and the torque section controls the slack of the tape. By controlling the magnitude of the winding torque according to the amount, by adjusting the torque of the slack of the tape and adjusting the drawing speed of the tape guide, for example,
It is possible to perform the conventional tape protection in a shorter time than the unthreading processing time, which gives priority to the conventional tape protection while maintaining the protection of the tape.

Even if the tape is loosened during the unthreading operation of the VTR, the torque is corrected only when the tape is abnormal, and the conventional torque correction is performed during the normal operation. Can be avoided. As a result, it is possible to perform sufficient torque correction to quickly loosen the tape.

Further, not only is the tape winding torque increased when the tape becomes loose, but the rotation speed of the threading ring is controlled to slow the tape drawing speed into the VTR cassette, so that the tape and the tape guide contact each other. By protecting the tape by eliminating the slack by lengthening the period until contact, and controlling the rotation speed of the threading ring after the slack removal of the tape to gradually increase to the normal rotation speed, conventional tape protection It is possible to return to a normal operation in a shorter time than the time required for the unthreading operation that prioritizes.

The auxiliary torque is a value corresponding to the amount of slack of the tape, and by using a conversion coefficient calculated from a value obtained experimentally, for example, the error of the torque supplied when the slack of the tape is abnormal, for example, larger than the allowable amount. Can be suppressed and supplied as the optimum correction torque.

The present invention is not limited to the above-mentioned embodiment, and the same effect can be obtained even if it is applied to a so-called parallel loading type recording and / or reproducing apparatus which does not use a threading ring, that is, protection of a tape. It can be performed.

[0055]

In the recording and / or reproducing apparatus according to the present invention, the slack detection function detects the slack of the tape, and the operation control function controls the operation speed of unthreading according to the slack amount of the tape. By controlling the size of the winding torque according to the amount of slack of the tape with the function, adjusting the torque of the slack of the tape and adjusting the drawing speed of the tape guide, for example, while maintaining the protection of the tape, the conventional tape protection Can be performed in a shorter time than the priority unthreading processing time.

Even if the tape is loosened during the unthreading operation of the VTR, the torque is corrected only when the tape is abnormal, and the conventional torque correction is performed during normal operation. Can be avoided. As a result, it is possible to perform sufficient torque correction to quickly loosen the tape.

In addition to increasing the tape winding torque when slackening of the tape occurs, the rotation speed of the threading ring is controlled to slow down the drawing speed of the tape into the VTR cassette, so that the tape and the tape guide are brought into contact with each other. By protecting the tape by eliminating the slack by lengthening the period until contact, and controlling the rotation speed of the threading ring after the slack removal of the tape to gradually increase to the normal rotation speed, conventional tape protection It is possible to return to a normal operation in a shorter time than the time required for the unthreading operation that prioritizes.

The auxiliary torque is a value corresponding to the amount of slack of the tape, and by using a conversion coefficient calculated from a value obtained experimentally, for example, an error of the torque supplied when the slack of the tape is larger than the allowable amount, for example. Can be suppressed and supplied as the optimum correction torque.

[Brief description of drawings]

FIG. 1 is a schematic block diagram for performing an unthreading operation of a VTR to which a recording and / or reproducing apparatus according to the present invention is applied.

FIG. 2 is a functional block diagram of a CPU of the VTR.

FIG. 3 is a main flowchart explaining an operation procedure in the VTR.

FIG. 4 is a plan view illustrating the rotation of a threading ring used in the so-called U loading method of the VTR.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Loosening detection unit 2 Operation control unit 3 Torque control unit 1a Tape slack amount calculation unit 1b Comparison unit 3a Normal torque generation unit 3b Correction torque calculation unit 3c Correction torque generation unit 3d Torque switching unit

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[Procedure amendment]

[Submission date] December 27, 1994

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] 0029

[Correction method] Change

[Correction content]

The tape slack amount calculation unit 1a may be, for example, an experimental indexing method or a method of obtaining the tape withdrawal amount from a simulation result using CAD. As an experimental indexing method, when several reference positions are set in advance and one or more arbitrarily selected return guides reach the reference position in each return guide depending on the rotation position of the threading ring. This is a method in which the actual amount of tape pulled out is measured by various sensors and the like.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0031

[Correction method] Change

[Correction content]

Next, the tape slack amount calculation unit 1a finds the actual tape winding amount , and when the tape does not loosen as described above.
Compare with the tape winding amount. First of all, of this tape slack
When the tape winding amount L _{t0 is} calculated in the case where it does not occur , for example, as shown in FIG.
The number of records corresponding to the number obtained by dividing the maximum value of the data supplied from 5a by N pulses is logically allocated as an array variable, and the tape withdrawal amount, which will be described later, registered in the allocated area is used.

[Procedure 3]

[Document name to be amended] Statement

[Name of item to be corrected] 0032

[Correction method] Change

[Correction content]

Here, the number of pulses P from the counter circuit 15a, the tape withdrawal amount T _n stored in the record to which this pulse number P belongs, and the tape withdrawal amount T stored in the record immediately before this record. When the _n-1 Ru using
Tape amount L _t0 drawn without slack _{is, L t0 = {P × (} T n -T n-1) / N} + T n-1 (1) and represented. The tape slack amount calculation unit 1a calculates the tape amount L _t0 that is extracted without slack , and the radius of the tape winding diameter obtained from another method and the counter circuit 15b or 15c.
The actual tape winding amount L _t1 calculated from the number of rotations of the tape reel obtained from is also calculated.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0033

[Correction method] Change

[Correction content]

As a result, the amount of tape slack ΔL _t is obtained from ΔL _t = L _t1 −L _t0 (2). The calculation result is supplied to the comparison unit 1b. In the comparison unit 1b, for example, the data R as shown in FIG.
The slack allowance value of the tape stored in advance in the OM 103 is compared with the calculated tape slack amount ΔL _t .
The comparison unit 1b supplies an output according to the comparison result as a control signal to the rotation speed control unit 2 and the torque control unit 3, respectively.

[Procedure Amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0038

[Correction method] Change

[Correction content]

The torque switching section 3d includes a correction torque generating section 3c and a normal torque generating section 3 according to a signal from the comparing section 1b.
The signal from either one of a is selected. Driving the T reel motor 11 _T output signal from the torque switching section 3d via the output port 106 as the winding torque control signal
Drive circuit 12 _T.

[Procedure correction 6]

[Document name to be amended] Statement

[Correction target item name] 0042

[Correction method] Change

[Correction content]

When the actual tape slack amount ΔL _t in this VTR is greater than or _equal to the allowable amount (No), it is determined that the tape may be damaged, and the process proceeds to step S11. In step S11, the rotation speed control unit 2 controls the threading ring 20 of FIG. 4 according to the output from the comparison unit 1b.
The rotation speed of is set to a constant low speed slower than the normal rotation speed. By controlling the rotation speed of the threading ring 20 in this manner, the threading ring 20 is slowly rotated in the clockwise direction from the tape running state by the rotational driving of the threading motor 24. As a result, there is a time margin in the tape pull-in time until the loosened tape contacts the tape guide.

[Procedure Amendment 7]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 2

[Correction method] Change

[Correction content]

[Fig. 2]

Claims (4)

[Claims] 1. A recording and / or reproducing apparatus having a mechanism for transporting a tape drawn from a cassette along a tape traveling path from a traveling state position on the rotary head drum into the cassette and storing the tape, Slack detecting means for detecting the slack of the tape, operation control means for controlling the unthreading operation speed in accordance with the slack amount of the tape detected by the slack detecting means, and the slack amount of the tape detected by the slack detecting means. And a torque control means for controlling the magnitude of the winding torque according to the recording and / or reproducing apparatus. 2. The operation control means, when the amount of slack of the tape exceeds a certain value, controls switching of the speed of the unthreading operation to a speed lower than a normal speed, and the torque control means normally controls the speed. The recording and / or reproducing apparatus according to claim 1, wherein a control signal of a value obtained by adding an auxiliary torque to the torque of (1) is output. 3. The operation control means is for gradually returning the speed of the unthreading operation to the normal speed when the slack amount of the tape is smaller than a certain value and slower than the normal unthreading operation speed. The recording and / or reproducing apparatus according to claim 1, which is characterized in that. 4. The recording and / or reproducing apparatus according to claim 2, wherein the auxiliary torque has a value corresponding to a slack amount of the tape.