JP2002237110A - Magnetic recording/reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a magnetic recording/reproducing device which can remove a large slack occurred in the magnetic tape when a power failure occurs in a fast-forwarding mode and a rewinding mode, without depending on a complicated control mechanism at the recovery operation from the power failure, and can prevent the damage of the magnetic tape. SOLUTION: The magnetic recording/reproducing device is provided with a microcomputer 19 for detecting the power failure and release of the power failure, a mode switch 14 for detecting a phase of a tape mechanism, and a timer 17 for measuring predetermined fixed tape winding up time. This device is constituted so that when the microcomputer 19 detects release of power failure and the mode switch 14 detects the fast-forwarding mode or the rewinding mode, the winding up operation of the reel bases 1 and 2 is alternately carried out for each specific time measured by the timer 17 with a tape driving control means, and while changing a winding up direction of a magnetic tape 3, the tape 3 is wound up to tape reels 3a and 3b. Since the slack portion is alternately wound up from the outside and from the inner side, the tape 3 can be prevented from being bent.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording / reproducing apparatus using a magnetic tape, and more particularly to a magnetic recording / reproducing apparatus which removes slack generated in a magnetic tape when a power failure occurs in a fast-forward mode or a rewind mode during a power failure recovery operation. It concerns the device.

[0002]

2. Description of the Related Art Heretofore, a method has been devised in which a slack that occurs in a magnetic tape when a power failure occurs in a fast-forward mode or a rewind mode is performed during a return operation after a power failure is released.
Japanese Patent Application Laid-Open No. Hei 10-134445 discloses that, when a power failure occurs, control information indicating whether the mode is a fast-forward mode or a rewind mode is recorded in an external memory, and based on the control information, when the power failure is restored, the fast-forward mode is used. There has been proposed a slack removing method in which a take-up reel base is wound up, and in a rewind mode, a supply-side reel base is wound up. Here, the take-up reel base and the supply-side reel base refer to the take-up side and the supply side during recording and reproduction, respectively.

[0003]

However, in recent years,
As the speeds of the rewinding and fast-forwarding modes have become extremely high, the slack of the magnetic tape that occurs at the time of a power failure has increased. Most of such looseness occurs inside the cassette case, but if this amount is large, a tape jam occurs in the cassette case while the loosened portion is being wound, causing damage to the magnetic tape. There is a problem.

In general, if a power failure occurs while the magnetic tape is running in the fast-forward mode or the rewind mode, the winding motor stops and the load on the magnetic tape is increased. The reel base stops rapidly, while the reel base on the sending side rotates by inertia and keeps sending the magnetic tape until it stops due to frictional force, etc., so tape slack occurs inside the cassette case and on the sending side I do. The tape slack that occurs increases as the speed of fast-forward and rewind increases.

If it is attempted to wind up the slack portion only by rotating the reel side on the sending side in the winding direction, the magnetic tape is wound up with the slack portion being folded without being loosened. Tightening acts from the slack portion to the inner slack portion, and the inner slack portion may be damaged such as a fold. To remove slack only by rotating the reel base on the take-up side,
Since the slack is removed only from the outside of the magnetic tape, tightening works from the outer slack portion to the inner slack portion, and the inner slack portion may be damaged such as a fold.

The tape position after slack removal is preferably close to the tape position at the time of the power failure in consideration of the convenience of playback and recording in the subsequent operation. Although it is desirable to set the tape position, there is a problem that the tape position is greatly changed by rewinding.

Further, when the rewind / fast-forward mode is high speed, it takes more than 20 seconds to remove slack, and during this time, other operations cannot be performed, which may cause anxiety to the user. Was.

In addition, the above-mentioned Japanese Patent Application Laid-Open No. 10-13444
The method described in Japanese Patent Application Laid-Open No. 5 (1995) requires an external memory for storing a mode at the time of the occurrence of a power failure, and means for controlling writing / reading of the mode.

In addition, Japanese Patent Application Laid-Open No. 58-147835 proposes a method in which a solenoid and an instantaneous stop mechanism are provided and the reel stand is instantaneously stopped in the event of a power failure. Therefore, a large-scale mechanism is required, and a large number of members are required, resulting in an increase in cost.

[0010] The present invention solves the above-mentioned problem, and eliminates a large slack generated on a magnetic tape when a power failure occurs in the fast-forward / rewind mode without relying on a complicated control mechanism during a power failure recovery operation. It is an object of the present invention to provide a magnetic recording / reproducing apparatus which can perform the above-mentioned operation and can avoid damage to the magnetic tape.

[0011]

According to a first aspect of the present invention, a tape reel holding a magnetic tape is mounted and rotated integrally to drive winding of the magnetic tape. A power failure detection means for detecting a power failure and cancellation of a power failure in a magnetic recording / reproducing apparatus having a pair of reel bases and tape drive control means for controlling a tape winding direction and a tape winding direction of each reel base, and a tape mechanism And a first timer means for measuring a predetermined constant tape winding time, wherein the tape drive control means detects that the power failure detection means has released the power failure, When the phase detecting means detects the fast-forward mode or the rewind mode, the reel units are wound up alternately at regular intervals measured by the first timer means. Te, wound on each tape reel while changing the winding direction of the magnetic tape, characterized by being configured to remove a tape slack generated during a power failure.

According to this configuration, the slack portion is wound up alternately from the inside and from the outside, so that the conventional tightening of the slack portion from the outer slack portion to the inner slack portion does not work, and the magnetic tape does not work. Damage due to bending or the like can be prevented.

According to a second aspect of the present invention, in the magnetic recording / reproducing apparatus according to the first aspect, rotation detecting means for detecting rotation of each reel base is disposed, and the tape drive control means is provided with one of the reel bases. When the rotation detecting means detects that the other reel base follows and rotates during the take-up operation, each reel base is stopped.

According to this configuration, each reel base is stopped as soon as the tape slack is removed, so that the slack removal time of the magnetic tape can be reduced, and the tape can be returned to the same position as the tape position at the time of the power failure. .

According to a third aspect of the present invention, in the magnetic recording / reproducing apparatus according to the first or second aspect, a second timer means for measuring a predetermined constant tape winding time is arranged. The tape drive control means is configured to, at the end of the removal of the tape slack, rotate each reel base in a reverse direction for a predetermined time measured by the second timer means to rewind the magnetic tape. Features.

According to this configuration, the magnetic tape can be returned to a position equivalent to the tape position at the time of the occurrence of the power failure or a position where the magnetic tape has been rewound by an appropriate amount without damage.

[0017]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic configuration diagram of a magnetic recording / reproducing apparatus according to an embodiment of the present invention, and FIG. 2 is a flowchart showing an operation of the magnetic recording / reproducing apparatus after a power failure is released.

Referring to FIG. 1, reference numerals 1 and 2 drive tape winding reels 3a and 3b holding a magnetic tape 3 and are rotated by winding motors (not shown) provided respectively to drive the winding of the magnetic tape 3. Supply reel table and take-up reel table. Here, the supply-side reel base 1 and the take-up reel base 2 are respectively a take-up side during recording and reproduction,
The supply side means the direction in which the magnetic tape 3 travels from the supply side reel base 1 to the take-up side reel base 2, and the magnetic tape 3 runs from the take-up side reel base 2 to the supply side reel base 1. The direction is called a rewind direction.

Reference numeral 4 denotes a supply-side reel base 1 and a take-up-side reel base 2
A head cylinder for winding the magnetic tape 3 between them for recording / reproducing, a capstan motor 5 for sandwiching and running the magnetic tape 3 with a pinch roller (not shown), and 6 for rotating the capstan motor 5 A capstan motor control section 7 for controlling is a capstan direction control section for controlling the rotation direction of the capstan motor 5.

8 is a supply side brake for braking the supply side reel base 1, 9 is a winding side brake for braking the winding side reel base 2, and 10 is a longitudinally extending supply side brake 8 and winding side brake 9. A main rod mounted at intervals in the direction and intersecting the longitudinal direction,
a and 10b are supported on a chassis (not shown) by a main cam 11 and are moved in the longitudinal direction so that the supply brake 8 and the take-up brake 9 are moved to the supply reel bases 1 and 10b.
It is separated from the take-up reel base 2 by contact. A loading motor 12 drives the rotation of the main cam 11, and a loading motor control unit 13 controls the rotation speed of the loading motor 12.

Therefore, the capstan motor 5, the capstan motor control unit 6, the capstan direction control unit 7,
Winding side brake 9, supply side brake 8, main rod 1
0, the main cam 11, the loading motor 12, and the loading motor control unit 13 constitute a tape drive control unit that controls the tape winding direction and the tape winding direction of the supply-side reel table 1 and the winding-side reel table 2.

Reference numeral 14 denotes a mode switch for determining the mode of the tape mechanism based on the rotation of the main cam 11;
Reference numeral 6 denotes a reel stand rotation detecting device that detects the rotation of the supply-side reel stand 1 and the take-up reel stand 2, respectively. 17,18
Are timers for measuring the winding time of the magnetic tape 3, that is, the rotation time of the supply reel unit 1 and the winding reel unit 2.

Reference numeral 19 denotes a microcomputer, which is a take-up motor for the supply-side reel base 1 and the take-up reel base 2, a capstan motor control unit 6, a capstan direction control unit 7, a loading motor control unit 13, a mode switch. 14, connected to the reel base rotation detecting devices 15, 16 and timers 17, 18, and transmit and receive signals to and from these members and devices to operate the tape mechanism as follows, and to detect power failure of itself. A power outage is detected by monitoring the input terminal, the power outage mode is set, and the power outage recovery operation is performed by canceling the power outage detection of the terminal.

When the recording / reproducing operation, the fast-forward operation, and the rewind operation are described below, the supply reel unit 1 and the take-up reel unit 2 are rotated, and the supply reel unit 1 is rotated.
The magnetic tape 3 is sent out from the upper tape reel 3a,
The tape is wound on the tape reel 3 b on the take-up reel base 2, and the capstan motor 5 is rotated in synchronization with the take-up reel base 2 so that the magnetic tape 3 runs.

When the magnetic tape 3 is normally stopped, the main cam 11 is driven by the loading motor 12, the main rod 10 is moved, and the take-up brake 9 and the supply brake 8 attached to the main rod 10 are simultaneously operated on the supply side. The reel base 1 and the take-up reel base 2 are pressed against each other, and their rotations are stopped.

If a power failure occurs during fast-forwarding or rewinding, the reel base on which the magnetic tape 3 is wound rapidly stops as described above, while the reel base on which the magnetic tape 3 is wound is rotated by inertia. Keep doing. As a result, tape slack occurs in the cassette case 3c.

For this reason, the tape slack is removed at the time of the return operation after the cancellation of the power failure. That is, as shown in FIG. 2, in S1, the microcomputer 19 detects the release of the power failure and shifts to the power failure recovery operation.
4, the mode of the tape mechanism is fast forward mode,
It is determined whether the mode is the rewind mode.

In the fast forward mode and the rewind mode,
In S3, the capstan motor 5 is rotated, the rotation of the supply-side reel base 1 is driven, and at the same time, the timer 17 is started, and the winding in the rewinding direction for 6 seconds preset in the timer 17 is started. .

In S4, it is determined whether six seconds have elapsed or whether the reel base rotation detecting means 15 and 16 have detected the start of rotation of the reel base opposite to the drive side (here, the take-up reel base 2). Is done. This is to determine whether tape slack has been removed by following the rotation of one reel base and the other reel base starting to rotate. If 6 seconds have not elapsed or rotation has not been detected, there is still tape slack, so winding and discrimination in S4 are repeated.

If six seconds have elapsed or the start of rotation has been detected, the capstan motor 5 is reversed in S5, the rotation of the take-up reel base 2 is driven, and at the same time, the timer 17 is reset and started. The winding for 6 seconds set in is started.

In S6, it is determined whether six seconds have elapsed or whether the reel base rotation detecting means 15 and 16 have detected the start of rotation of the reel base opposite to the drive side (here, the supply reel base 1). You. If six seconds have not elapsed or rotation has not been detected, winding and discrimination in S6 are repeated.

If six seconds have elapsed or the start of rotation has been detected, the capstan motor 5 is reversed and the rotation of the supply side reel base 1 is driven in S7, and at the same time, the timer 18 is reset-started. The set rewind for 5 seconds is performed.

In S8, the rotation of the supply-side reel base 1 and the take-up reel base 2 is stopped, the loading motor 12 is started, and the supply-side brake 8 and the take-up brake 9
Presses against the supply-side reel base 1 and the take-up reel base 2, and the mode is shifted to the stop mode.

If it is determined in S2 that the mode is not the fast-forward mode or the rewind mode, the process directly proceeds to S8, and the mode is shifted to the stop mode. In the above-described embodiment, when it is determined that the mode is the fast forward mode or the rewind mode, first,
Although the winding operation is started in the rewinding direction, the operation may be started in the winding direction. Needless to say, the winding time can be changed according to the winding speed.

[0035]

As described above, according to the present invention, the reel bases are alternately wound after the power failure is released, so that the tape slack caused by the power failure is gradually wound from the inside and the outside. Therefore, the slack can be removed without giving a stress to the magnetic tape and thus causing no tape damage. In addition, since it is not necessary to determine the winding direction in one direction, there is no need for a mode memory unit that does not lose the memory even in the event of a power failure, as in the related art, and it is possible to suppress an increase in cost for removing slack.

Further, since it is detected that the other reel base follows the rotation during the winding operation of one reel base and the respective reel bases are stopped at that time, the slack removal time is shortened. , Recovery from power failure is quicker.

Furthermore, since the rewinding operation is performed for a certain period of time after the tape slack is removed, the magnetic tape can be returned to a position equivalent to the tape position at the time of the power failure or a position where the magnetic tape has been rewound an appropriate amount without damage. Can be.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a magnetic recording / reproducing apparatus according to an embodiment of the present invention.

FIG. 2 is a flowchart showing an operation of the magnetic recording / reproducing apparatus of FIG. 1 after a power failure is released.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Supply side reel stand 2 Take-up side reel stand 3 Magnetic tape 3a, 3b Tape reel 4 Head cylinder 5 Capstan motor 8 Supply side brake 9 Take-up side brake 11 Main cam 12 Loading motor 14 Mode switch (phase detection means) 15, 16 Reel rotation detector 17, 18 Timer 19 Microcomputer (power failure detection means)

Claims (3)

[Claims] 1. A pair of reel bases for mounting a tape reel holding a magnetic tape and rotating integrally to drive the winding of the magnetic tape, and controlling a tape winding and a tape winding direction of each reel base. A power failure detection means for detecting a power failure and a power failure cancellation, a phase detection means for detecting a phase of a tape mechanism, and measuring a predetermined constant tape winding time. And a first timer means for controlling the tape drive control means. The first timer means controls the tape drive control means when the power failure detection means detects a power failure release and the phase detection means detects a fast-forward mode or a rewind mode. Winding each reel base alternately at fixed time intervals measured, winding the magnetic tape around each tape reel while changing the winding direction Taken, the magnetic recording and reproducing apparatus characterized by being configured to remove a tape slack generated during a power failure. 2. A rotation detecting means for detecting rotation of each reel base is provided, and the tape drive control means is adapted to rotate while the other reel base follows the winding operation of one of the reel bases. 2. The magnetic recording / reproducing apparatus according to claim 1, wherein each reel base is stopped when the rotation is detected by the rotation detecting means. 3. A second timer means for measuring a predetermined fixed tape winding time is provided, and the tape drive control means is used to measure each reel base by the second timer means at the end of tape slack removal. 3. The magnetic recording / reproducing apparatus according to claim 1, wherein the magnetic tape is rewound by rotating the magnetic tape in a reverse direction for a certain period of time.