JPH0444655A - Tape tension controller for rotary head type tape player - Google Patents

Abstract

PURPOSE:To prevent damage for a tape from being enlarged even when frequently setting a pause mode or a review mode by monitoring tape tension in the pause mode or the review mode. CONSTITUTION:During a recording or reproducing operation, servo is loaded to a capstan motor Ma and the tape is fed at normal speed. At such a time, tape tension is detected by a tension sensor 8, and a reel servo circuit 13 controls the back torque of a reel motor M on a tape supply side so that the tape tension can be set at a fixed value at a part in contact with a rotary head device. On the other hand, when a pause command is outputted during the recording operation, the capstan motor Ma is stopped by the command of a CPU 10. Thus, the tape tension at the part in contact with the rotary head device is turned to be zero, and even when frequently executing a STILL operation, the tape damage is not enlarged.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a rotary head type tape player used for recording and reproducing computer data or recording and reproducing audio information, and particularly relates to a rotary head device. The present invention relates to a tape tension control device capable of minimizing damage to a tape in a tape stopping mode or tape rewinding mode when the tape is rotating.

[Conventional technology]

FIG. 4 is a plan view showing a schematic structure of a rotary head device for DAT.

Reference numerals R1 and R2 provided on the chassis 1 are reel stands, and the respective tape reels in the cassette back C are installed on the reel stands R1 and R2. The magnetic tape T is pulled out from inside the cassette back C by loading bases 4 and 5 and wound around the rotary head device 2. Reference numeral 3 is a capstan. This capstan 3 is driven 2 by a capstan motor Ma (only the reference numeral is shown). Reference numeral 6 is a pinch roller. The pinch roller 6 is supported by a roller lever 7 and rotates about a shaft 7a. The loading bases 4 and 5 and the roller lever 7 are driven by the mode switching motor Mb, and the pinch roller 6 is moved from the ta+ position to (
Move to position b). When switching from stop mode to recording or playback mode, the pinch roller 6
It moves to the + position and comes into pressure contact with the capstan 3, and the tape is fed out by the rotational speed of the capstan 3.

Reference numeral 8 is a tension sensor. This tension sensor 8 is rotatably supported by a shaft 8a. A post 8b is provided at the tip of the tension sensor 8, and is pressed against the tape T by the elastic force of a spring 90. An optical detector 8c is provided at the base of the tension sensor 8.

The rotation angle of the tape tension sensor 80 changes depending on the strength of the tape tension, thereby detecting the tension.

In the above-mentioned rotary head type tape player, while the tape is running, the reel motor M1 that drives the reel stand R on the tape feeding side generates a predetermined back torque, which gives tape tension. First, in a recording or reproducing operation, the feed side reel stand R1 is
A servo is applied to the reel morph M, which drives the reel morph M, and the tape tension F1 at the portion in contact with the rotary head M2 is controlled to always be constant. In the cue operation, the pinch roller 6 holds the tape T against the capstan 3.
While being pressed, the capstan motor Ma rotates at a slightly higher speed than in the recording or playback mode to run the tape. Further, the rotary head device 2 remains rotationally driven. At this time as well, based on the detection operation by the tension sensor 8, the F
is controlled so that it is always constant (for example, 7g).

In the review operation, the capstan 3 is reversed in the same state as the cue mode, and the tape is rewound by the reel stand R4. At this time, a constant voltage is applied to the reel stand R1 on the winding side to set the tape tension F1.

[Problems to be Solved by the Invention] The conventional tape tension settings described above have the following two disadvantages.

In rotating head tape players, it may be necessary to set a pause mode during recording operations. In the case of a conventional VTR, this mode is used for corrected images and is called 5TILL. In 5TILL, the pinch roller 6 touches the capstan 3 during the recording operation.
Conventionally, the tape tension when the cab scan motor is stopped and the rotary head device 2 continues to rotate while it is in pressure contact with Fl(
For example, it is the same as 7g), and is set by the back torque of the reel stand R1, so that the tape tension continues to be applied even if the recording or playback mode is continued. However, recent rotary head devices for DAT are sometimes used for backing up computer data. In the case of the 5TILL VTR, in order to obtain an image signal from the tape, it was necessary to set the tape tension F so that the tape came into reproducible contact with the magnetic head, but for computer data, Bose Since the mode is waiting for data, the conventional 5TILL
It is not necessary to set the tape tension as in Despite this, when waiting for data transfer from the host computer, this Bose mode
If the same mode is used frequently, the rotary head device will always rotate with the tape tension F1 applied, which will increase tape damage and reduce the reliability of computer data. . Similarly,
Even when setting the Bose mode on an audio DAT, signal reproduction like the 5TILL of a VTR is not required, so setting the tape tension to the same value as in the recording or playback mode is a good idea when setting the tape tension to the same value as in the recording or playback mode. It only increases the damage.

Another inconvenience occurs when in review mode. In the review mode, as described above, the capstan is reversed and the tape is wound on the reel stand R1. Conventionally, in this review mode, a constant voltage is always applied to the reel stand R3 on the winding side, and a constant back torque is applied. Therefore, as shown in FIG. 6, when the number of tape windings on the reel stand R1 side is large, the tape tension becomes small because the winding diameter of the reel stand R1 is large, and when the winding diameter of the reel stand R is small, the review mode is Time tape tension F.

becomes larger. In the case of DA and T tapes, the variation in tape tension Fl due to changes in tape winding diameter is approximately 2.5 times. When performing a data search operation in the review mode, it is necessary to increase the tension F to a certain extent to maintain the contact pressure between the head and the tape. Therefore, if the minimum value of the tape tension F in the head section in the review mode is set to 7g, which is necessary for the search, as shown by the dotted line in Fig. 6,
The maximum value of tape tension F increases to 17.5 g. However, when used for backing up a computer, the review mode is frequently set to restart recording from the Bose mode, and the search operation to find the recording start position is repeated. If this is set, tape damage will become extremely large due to the increase in the tape tension F+ described above. Taking this tape damage into account, if the average value of the tape tension F1 is set to around 7g, as shown by the solid line in Figure 6, the tape tension
The minimum value of 1 is about 4g, and the reproduction envelope in the review mode becomes unstable, which often causes subcode reading errors in search operations.

The present invention solves the above-mentioned conventional problems, and prevents tape tension from becoming excessive in Bose mode (STILL state) or review mode, and prevents tape tension from becoming excessive when used as a backup of computer data. This feature not only prevents tape damage from increasing even when Bose mode or review mode is set, but also prevents tape tension from becoming excessive in Bose mode for audio DATs. An object of the present invention is to provide a tape tension control device for a rotary head type tape player, which can start tape running after the tape tension value has been recovered.

[Means for Solving the Problems] A tape tension control device according to the present invention includes a rotary head device around which a magnetic tape is wound, a capstan that rotates at a constant speed, a pinch roller that presses the magnetic tape against the capstan, and this pinch roller. In a rotary head type tape player, the rotary head type tape player is equipped with a mode switching drive unit that presses the tape reel against the capstan, a reel motor that powers each reel stand on which the tape reel is installed, and a reel servo circuit that controls the reel motor. When a pause command is issued during a recording or playback mode in which the reel motor is controlled by the reel servo circuit and the tape tension is set, the rotating head device continues to rotate and the pinch roller presses the tape against the capstan. The present invention is characterized by being provided with a control section that stops the capstan and changes the rotation control of the tape feed side glue lever to reduce or eliminate the tension torque when .

Furthermore, the above means is provided with means for detecting the tape tension during the recording or playback mode and means for storing information based on the tension value, so that when the pause command is released, the controller controls the tape feeding side. The tape tension is restored to the stored value by changing the rotational control of the reel motor, and then the capstan is rotated to resume tape feeding.

Furthermore, the tape tension control device according to the present invention includes a rotary head device around which a magnetic tape is wound, a capstan that rotates at a constant speed, a pinch roller that presses the magnetic tape against the capstan, and a mode switch that presses the pinch roller against the capstan. In a rotary head tape player that is equipped with a drive unit, a reel motor that powers each reel stand on which tape reels are installed, and a servo circuit that controls tape feeding, the rotary head device continues to rotate and When a review mode setting command is issued to reverse the capstan and rewind the tape while the pinch roller is pressing the tape against the capstan, the servo circuit performs control to keep the tape tension constant. The device is characterized by being provided with a control section.

[Operation] In the first means, when the pause mode is set, that is, when the cab stan morph stops and the rotary head device continues to rotate during recording or playback operation,
To reduce or eliminate back torque by a reel motor that drives a reel stand on the sending side. This can prevent tape damage from increasing due to the rotating head device during the pause operation.

The second means detects and stores the tape tension value in the recording or reproduction mode, and the first means lowers the tape tension in the pause mode. Furthermore, when returning from pause mode to recording or playback mode, first apply back torque to the reel stand on the feeding side according to the memorized value to return the tape tension value to the recording or playback state, and then start rotating the capstan. Restart and run the tape. Therefore, when returning to playback mode after setting pause mode during playback in an audio DAT, the appropriate tape tension is set immediately after playback resumes, and signal playback is temporarily interrupted at the start-up time of playback operation. You can prevent inconveniences such as

In the third means, the tape tension is controlled to be constant at all times by using, for example, the tension sensor 8 shown in FIG. 4 during the review mode. As a result, as shown by the dotted line in Figure 6, the tension torque becomes excessive and tape damage decreases, and as shown by the solid line in Figure 6, the tape tension becomes too small and the playback envelope is distorted during the search operation. can be prevented from becoming unstable.

[Example] Embodiments of the present invention will be described below with reference to the drawings.

In this embodiment, the structure of the rotary head tape player is as shown in FIG.

That is, reel stands R3 and R2 are connected to reel motors M1 and M
Loading bases 4 and 5 and roller lever 7 are driven by mode switching motor Mb. Further, 2 is a rotating head device, 3 is a capstan, and 8 is a tension sensor. The capstan 3 is driven by a capstan motor Ma.

FIG. 1 is a block diagram showing a control circuit of the rotary head type tape player.

Reference numeral 10 denotes a control CPU that sets each mode. Each reel motor M1 and M2 is driven by a motor drive circuit (power supply circuit) 11 and 12. Each motor drive circuit 11 and 12 is controlled by a reel servo circuit 13. As shown in the figure, this reel servo circuit B13 is commonly used for each motor drive circuit 11 and 12,
Or they are provided separately. Further, a servo switching circuit 14 for switching the reel servo is provided. This servo switching circuit 14 may be incorporated into an IC integrated with the CPU10, or the servo switching function may be included in the real servo circuit 13 itself.Also, the detection output by the tension sensor 8 shown in FIG. 15, the signal is amplified and detected, A/D converted, and input to CPU10. The mode switching motor Mb is driven by a motor drive circuit 16, and this motor drive circuit 16 operates according to instructions from the CPU10.

The capstan motor Ma is driven by a motor drive circuit 17, and is servoed by a capstan servo circuit 18. This capstan servo circuit 18 is also controlled by CPU10.

In the above configuration, during recording or playback operation, the capstan motor Ma is servoed to feed the tape T sandwiched between the pinch roller 6 at a constant speed, and the rotary head device 2 continues to rotate. . Also, at this time, the tape tension F2 is detected by the tension sensor 8, the back torque of the reel motor M1 on the tape feeding side is controlled by the reel servo circuit 13, and the tape tension F at the part that contacts the rotary head device 2 is set to 7 g, for example. (See PLAY in the diagram of FIG. 5).

For example, during a recording operation, if a pause command such as waiting for recording data is issued, the capstan motor Ma is stopped by a command from the CPU10.

At this time, the mode switching motor Mb is not driven and the pinch roller 6 remains in pressure contact with the capstan 3.
It becomes ILL operation. At this time, the servo switching circuit 14 is activated by a command from the CPU10. This operation is, for example, a switching operation, in which the voltage applied to the tape feeding reel motor M is reduced or cut off. As a result, the tape tension F1 in the portion that is in contact with the rotating head device 2 decreases to, for example, about 2 g, or becomes almost zero (see 5TILL in the diagram of FIG. 5), so this 5TILL operation is frequently performed. Even if you do this, the damage to the tape will not increase.

Next, when a command to resume recording or reproduction is issued during the 5TILL operation (when the pause mode is set), the following control is performed. This control will be explained in detail later in the flowchart of FIG. 2 or 3, but
Various methods are envisaged, such as the following. First, if a recording restart command is issued after a pause in a device used for computer data backup,
After setting the review mode described later, that is, after rewinding the tape slightly and searching for the recording start position, the playback operation is switched to, the tape is fed to the recording start position, and data such as ampules are recorded from that start position. It will be restarted. In the control when restarting the playback operation after this review, first, the tape tension F output from the tension sensor 8 in the recording mode immediately before the pause mode was set.
2 information (for example, the tension value or the state of the tension sensor 8) is stored in the storage means within the CPU10 or the external storage means, and when resuming playback, the reel servo circuit 13 first generates back torque. . When the information on the tension F2 detected by the tension sensor 8 matches the stored value,
After the reel servo circuit 13 is brought into a locked state and this locked state is detected by the CPU10, the capstan motor Ma is started to resume tape running. Therefore, simply by starting up the servo of the capstan motor Ma, the recording possible state can be restored in a short time.

Alternatively, when the Bose mode is set during a playback operation, such as with an audio DAT, and when the playback is restarted, the following control is performed when a search in the review mode is not necessary.

At this time, information on the tension F detected by the tension sensor 8 during the regeneration mode immediately before the Bose mode is stored, and when a regeneration restart command is issued, the reel servo circuit 13 first generates a back torque. is generated, and when the information from the tension sensor 8 matches the stored value, the capstan motor Ma is started. This allows the device to become ready for playback in a short time when transitioning from Bose mode to playback mode, saves startup time, and minimizes the time that reading is interrupted when playback resumes.

Next, the review mode settings will be explained.

When the review mode is set, with the pinch roller 6 in pressure contact with the capstan 3, the capstan motor M
a is reversed, the reel stand R1 is driven again, and the tape T
is rewound. Even when the capstan motor Ma is reversed, the tape is returned at a constant speed by the capstan 3, and the rotary head device 2 is brought into a state in which signals can be reproduced.

At this time, the reel servo circuit 13 operates according to a command from the CPU10, and the reel motor M on the tape winding side operates.
Servo is applied to 1. In this servo operation, the tape tension F2 at the detection position is detected by the tension sensor 8, and the tape tension FI is controlled to always be constant based on this detection operation.

At this time, if the tension F1 of the tape in the portion that is in contact with the rotating head device 2 is set to approximately the same as in the recording or playback mode, for example 7 g, the tape tension F2 detected by the tension sensor 8 is set to the loading base 4, etc. In order to handle the tape load of F1, it is necessary to make it larger than F1. Conversely, in record or playback mode,
The tension F2 at the detection position is smaller than F (therefore, the same tension sensor 8 is used in recording or playback mode and review mode, but the control of the reel motor etc. based on its detection output is different from that during recording or playback. This is different depending on the review mode.Therefore, switching of the tension torque setting is performed by a switching operation of the servo switching circuit 14.

Although the illustrated embodiment shows a rotary head type tape player that uses the tension sensor 8, it is also possible to implement the present invention with a player that does not include the tension sensor 8. When the tension sensor 8 is not used, the rotation speed of the reel stand R3 or R2 is detected by an optical detector, and based on this, the tape winding diameter is determined,
The morph output torque may be changed in accordance with changes in the winding diameter.

Next, a series of operations will be explained using flowcharts shown in FIGS. 2 and 3.

Figure 2 shows how, when used for computer data backup, recording is temporarily interrupted to wait for data during recording, Bose mode is set, and when recording is resumed, review mode is set. This figure shows a control operation for searching and restarting data recording from a joint portion of previously recorded data via an ampoule.

When the recording mode is set, the reel servo circuit 13 operates to control the tape tension so that it is always constant (step (A)). Pose (ST
When ILL+ is set (step (B)), the capstan motor Ma stops, and in step (c,)), servo switching is performed by the servo switching circuit 14, and the tape tension is reduced or set to zero. (Step (C11) Waits for a recording restart command in this state (Step (Di)) When a recording restart command is issued, the review mode is set (Step fE, ++, that is, the capstan is pressed with the pinch roller 6 Motor Ma
is reversed, the tape is rewound by the reel motor M, and a search is performed. During this review operation,
The reel servo circuit 13 is switched by the servo switching circuit 14, and the tape tension to be rewound is controlled to be constant based on the detection information from the tension sensor 8 (step D: d).The tape is rewound by a predetermined amount. When the tape is loaded, the recording signal on the tape is read by the magnetic head, and a search for the recording restart position is performed (step + Fl).
y.

When the search is completed, the reel motor M1 and capstan motor Ma are stopped (step (G)), and in step fH), the reel servo circuit 13 is switched by the servo switching circuit 14, and the reel motor M1 is driven. Back tension is set by the reel stand R1.

Then, in step (Jl), it is determined whether or not the tape tension has been recovered.In other words, when the 5TILL setting command is issued in step (Bl), the 5TILL setting command is issued in step (Bl).
Immediately before setting L, the value of the tape tension F2 at the detection position at that time or information based on this value is stored based on the detection information from the tension sensor 8 (step (I)), and in step (J) , it is determined whether the tension F2 detected by the tension sensor 8 with the capstan 3 in the stopped state is the same as the stored value at (Il).

When the tension F detected by the tension sensor 8 matches the stored value, the reel servo circuit 13
is locked, the capstan servo circuit 18 starts the capstan servo, and the capstan 3 restarts tape running (step (K11). When the capstan servo is locked and the recording start position is reached ( Step (L)), recording is resumed (step tM)).

Next, FIG. 3 shows the operation of an audio DAT or the like when, for example, the Bose mode is set during playback and the playback continues after the Bose mode is canceled.

In FIG. 3, the same step symbols are used for the same or similar operations as in FIG. 2.

5TILL is set in the same manner as in Fig. 2, and step (
At C2)) the tape tension is reduced or set to zero. When the 5TILL setting command is issued,
The information on the tension F2 immediately before the setting of 5TILL is stored (step m), and when a restart command for regeneration is issued (step (D)), the reel servo circuit 13 moves the reel stand while the capstan 3 remains stopped. The back torque of R1 is set. Then, in step fJ), the tension F is determined based on the detection information from the tension sensor 8.
When it is determined that 2 matches the memorized value, capstan 3 is started to feed the tape, and at the same time the capstan servo is restarted (step [)), and when the capstan servo is in the locked state. , playback resumes. Note that this is the same in the recording operation, and when the 5TILL command is issued during recording, the same setting as above is made, and recording of music information, etc. is resumed after the capstan servo of step (Kl) is locked. be done.

〔effect〕

As described above, according to the present invention, Bose mode (STI
LL) or tape damage due to excessive tape tension in the review mode can be prevented.

Furthermore, the contact pressure between the tape and the rotary head device can be properly applied during the review operation, and a stable envelope can be obtained. Therefore, even if there is frequent data waiting, such as when using it for computer data backup,
The reliability of data storage does not deteriorate due to tape damage.

Further, in the invention according to claim 2, when a command to resume recording or playback is issued while the tape tension is being lowered by the Bose mode, the tension torque is first restored, and then the capstan is started to feed the tape. I'm trying to restart it. Therefore, as shown in the flowchart in Figure 3, for example, even when directly transitioning from Bose mode to playback or recording operation, there is no need to wait for tape tension recovery, and the transition to recording or playback is smooth. can.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a control circuit of a rotary head type tape player according to an embodiment of the present invention, FIGS. 2 and 3 are flowcharts each showing a series of control operations, and FIG. 4 is a block diagram showing a control circuit of a rotary head type tape player. FIG. 5 is a diagram showing the tape tension set by the control according to the present invention; FIG. 6 is a diagram showing the fluctuation of the tape tension to show the problems of the conventional method. . 2... Rotating head device, 3... Capstan, 6...
... Pinch roller, R,, R1 ... Reel stand, MlM
,... Reel motor, Ma... Capstan motor, Mb... Mode switching motor, 8... Tension sensor, 10... CPU, 13... Reel servo circuit, 14... Servo switching circuit. Figure 1 (Mb) Figure 4 Figure 5 Large Figure 6 R, /) Each strange size

Claims (1)

[Claims] 1. A rotating head device around which a magnetic tape is wound, a capstan that rotates at a constant speed, a pinch roller that presses the magnetic tape against the capstan, and a mode switching drive unit that presses the pinch roller against the capstan. In a rotary head tape player, the reel motor is provided with a reel motor that powers each reel stand on which the tape reel is installed, and a reel servo circuit that controls the reel motor, the reel motor being controlled by the reel servo circuit. If a pause command is issued during recording or playback mode when the tape tension has been set and the rotating head device continues to rotate and the pinch roller presses the tape against the capstan, the capstan will stop. Tape tension control device 2 for a rotary head type tape player, characterized in that it is provided with a control section that lowers or eliminates tension torque by changing rotational control of a reel motor on the tape feeding side. Alternatively, means for detecting tape tension during playback mode and means for storing information based on the tension value are provided, and when the pause command is released, the control unit changes the rotation control of the reel motor on the tape feeding side. 2. A tape tension control device for a rotary head type tape player according to claim 1, wherein the tape tension is restored to the stored value by rotating the capstan, and tape feeding is resumed by rotating the capstan. , a capstan that rotates at a constant speed, a pinch roller that presses the magnetic tape against the capstan, a mode switching drive unit that presses the pinch roller against the capstan, and provides power to each reel stand on which the tape reel is installed. In a rotary head tape player equipped with a reel motor and a servo circuit that controls tape feeding,
When a review mode setting command is issued to reverse the capstan and rewind the tape while the rotating head device continues to rotate and the pinch roller presses the tape against the capstan, the servo circuit adjusts the tape tension. A tape tension control device for a rotary head type tape player, characterized in that the device is provided with a control section that performs control to keep the tension constant.