JP2003228896A - Tape driving controller and driving controlling method therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To stably halt a tape without damaging the tape and a mechanism in detecting the end of the tape in tape fast-feeding and rewinding. <P>SOLUTION: When an end detecting means 11 detects the end of the tape in the course of high-speed tape feeding, a rotation direction control means changes the rotation direction of a motor 3 to feed an idler gear 13. The idler gear 13 is alternately engaged with a reel stand 1 and a take-up reel stand 2 to halt tape travelling. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tape drive control device, and is particularly characterized by stopping tape feed during tape drive travel.

[0002]

2. Description of the Related Art In a magnetic tape of a video tape recorder (VTR) of a magnetic recording / reproducing apparatus, a transparent tape called a leader tape is attached to each of the beginning and end of the magnetic tape. Then, a method of detecting the start end and the end is used by utilizing the difference in the light transmittance between the magnetic tape portion and the leader tape portion of the magnetic coated portion on the magnetic tape. When the beginning and end of the magnetic tape is detected during fast-forwarding and rewinding, the magnetic tape may be damaged unless it is stopped quickly, or the leader tape may come into contact with the cylinder, etc., causing damage. , It is necessary to stop the tape quickly when the start end is detected. When the tape is loosened when the tape is stopped, grease of a mechanism adheres to the tape, which may cause a serious trouble in the cylinder or the like.

Conventionally, there has been devised a method of changing the mode of the mechanism of the magnetic recording / reproducing apparatus to brake the tape running when the start end and the end are detected at the time of fast-forwarding or rewinding the magnetic tape.

FIG. 4 schematically shows a brake mechanism of a conventional tape drive control device for a VTR.

In FIG. 4, when the end detection sensor 11 detects the end of the magnetic tape during fast-forwarding of the tape, the microcomputer 10 issues a loading command to the loading motor control means 20 to operate the main cam 15. By the rotation of the loading motor 19,
The main cam 15 and the main arm 14 are moved, and the friction brakes 17 and 18 are pressed against the supply-side reel base 1 and the winding-side reel base 2 to stop the rotation of the reel bases. The operation of the mechanism is controlled by detecting the mode phase of the mode switch 16. Therefore, at this time, the phase of the mechanism due to the loading operation is detected by the mode switch 16 and stopped by the microcomputer in the braking phase. Controlled.

However, in the braking system using the mechanism utilizing the cam and the frictional force, variations in the braking force occur due to variations in the braking force, and when the brake is applied at the time of detecting the start end point, each reel stand There was a problem such as an imbalance in the braking force at the track and a large tape slack, and a slow cam movement, which prevented the tape from being stopped quickly. In addition, although the types of tapes have increased significantly in recent years, the inertial force of the tapes varies greatly depending on the type of tape, so brakes that match the inertial forces of all tapes have a complicated mechanism and are new. There was a problem that it could not be adapted to the tape that appeared.

Further, in the above braking system,
As a means to assist the slow reaction speed, when detecting the start and end ends, apply reverse brake or braking brake to the capstan motor 3 to cancel the inertia of the motor in the winding direction and stop the motor as soon as possible. The method of controlling so that it is done is also devised.

This method will be described with reference to FIG. In the flowchart of FIG. 5, when the end of the magnetic tape is detected in step S1, the capstan motor direction reversing unit 21 controls the capstan motor 3 in the opposite direction for the set time by the reversing timer 7 in steps S2 and S3. After that, the reverse brake is applied to control the capstan motor 3 so that the rotation of the capstan motor 3 is stopped quickly.

However, at this time, if the reversal amount is small, the inertial amount cannot be canceled, and if it is too large, the idler gear 13 engages with the delivery reel side, and only the delivery reel is braked, causing slack in the magnetic tape. In order to
The reverse braking amount is set to a minimum amount that cancels the inertial force of the capstan motor 3 and stops the motor. However, since the braking force of the mechanism at that time, the inertial force of the magnetic tape, the speed of the motor, and the load of the motor itself vary, it is extremely difficult to properly set the reverse braking amount. Further, even if the motor itself is stopped by the reversing brake, the inertial force of the cassette cannot be stopped.

Therefore, a stable brake which is not affected by the speed of the motor, the load of the motor itself, and the inertial force of the tape has been required.

[0011]

As described above, in the braking mechanism using the cam and the frictional force and the braking of the motor by the reversing brake, the problem that the reaction speed is slow, the problem that the braking force varies, and the reversal amount of the motor However, there is a problem in that it cannot be optimized, and it is not possible to cope with a new tape type that emerges. As a result, tape slack, tape damage, and mechanical component destruction may occur.

[0012]

In order to solve the above-mentioned problems, in the tape drive apparatus of the present invention, a motor for driving the tape running, a rotation control means for controlling the rotation direction of the motor, and a tape feeding are provided. A high-speed tape feed is provided, which has a feed reel stand for performing winding, a take-up reel stand for winding up, an idler gear transmitting means for transmitting the rotation of the motor to the reel stand, and an end detecting means for detecting the end of the tape. When the end detection means detects the tape end of the tape, the rotation direction control means changes the rotation direction of the motor, the idler gear means is engaged with the reel base, and the delivery reel base and the take-up reel are engaged. The feature is that the stands are stopped alternately.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION (Embodiment 1) An embodiment of the present invention will be described below with reference to FIGS. 1, 2 and 3. It should be noted that parts having the same configurations and effects as those of the conventional technique are denoted by the same reference numerals as those in FIG. V
The brake operation of the magnetic tape in the fast-forward operation of TR will be described.

An embodiment of the tape drive device of the present invention will be described with reference to FIGS. 1, 2 and 3. FIG. 1 is a schematic explanatory diagram and a block diagram of a mechanism mechanism, FIG. 2 is an operational explanatory diagram, and FIG. 3 is a flowchart of the first embodiment.

In FIG. 1, when the end of the tape is detected by the end detecting means 11 during fast-forwarding of the tape, the microcomputer 10 sends a reverse command to the capstan reverse controller 6.
Issued to. At the time when the end of the tape is detected, the rotation of the capstan motor 3 is very slow, and accordingly, the tape running is slow running near stop. At this time, the capstan motor inversion control unit 6 issues an inversion command to the capstan motor direction control unit 5, and starts the inversion of the capstan motor 3. At the same time, the inversion start time is set in the inversion time timer 7. The reversal time timer 8 measures the reversal time and notifies the microcomputer 10 of the end of the time when a predetermined time has elapsed. Upon receiving this, the microcomputer 10 issues a re-inversion command,
Output to the capstan re-inversion controller 6. At this time, the capstan motor re-inversion control unit 7 issues a re-inversion command to the capstan motor direction control unit 5, and starts re-inversion of the capstan motor 3. At the same time, the re-inversion start time is set in the re-inversion time timer 9. The re-inversion time timer 9 measures the re-inversion time and notifies the microcomputer 10 of the end of the time when a predetermined time has elapsed. Microcomputer 10
In response to this, the capstan motor control unit 4 issues a capstan motor stop command to the capstan motor control unit 4, and the capstan motor control unit 4 stops the capstan motor 3.

FIGS. 2A, 2B and 2C show the movement of the idler gear 13 during the stop operation.

FIG. 2A shows the state of the idler gear 13 immediately after the end of the tape is detected. At this time, the capstan motor 3 has not yet been reversed, and the idler gear 1
3 is engaged with the take-up reel base 2.

FIG. 2B shows a state of the idler gear 13 when the capstan motor 3 is reversed. At this time, the idler gear 13 is engaged with the delivery reel base 1 by reversing the capstan motor 3. As a result, the delivery reel base 1 is suddenly stopped. However, at this time, since the reel base 1 on the delivery side is stopped, the tension of the tape temporarily rises, and the reel base on the winding side starts rotating in the opposite direction. That is, although the reel stand 1 on the delivery side stops, the reel stand 2 on the take-up side rotates due to inertia and pulls the tape to temporarily increase the tape tension, but the reaction force of the increased tape tension acts, The reel base 2 on the take-up side starts reverse rotation in the reverse direction A.

FIG. 2C shows a state of the idler gear 13 at the time of reversing the capstan motor. At this time, the idler gear 13 is engaged with the take-up reel base 2 by re-inversion of the capstan motor 3. Due to the engagement of the gears, the take-up reel stand 2 is also stopped from rotating in the reverse direction by the idler gear 13. That is, when the idler gear 13 is engaged with the take-up reel base 2, the reverse rotation due to the reaction force of the take-up reel base 2 is stopped.

From the state shown in FIG. 2 (b) to the state shown in FIG. 2 (c), the take-up reel base 2 is rotated in the opposite direction by inertia due to the tape tension. , That time is about 0.06 seconds,
The actual amount of rotation within that time is minute. By the way, when the reversal is not performed again as in the present invention, the reel base continues to rotate slowly for 1 second or longer, and the tape slack occurs. That is, during the inertial rotation, the tape is taken out from the take-up reel base 2 and the tape is loosened. Further, after the idler gear 13 is engaged by re-reversing, the capstan 3 stops the take-up reel base 2 and the take-up is quickly performed, so that tape slack does not occur.

FIG. 3 is a flowchart of the control operation of the capstan motor 3. After the end of the magnetic tape is detected in step S1, the capstan motor is reversed for 0.1 second in steps S2 and S3. The reversing time at this time is set to a sufficient time that the capstan motor can be reversed regardless of the load state and speed and the idler gear 13 can engage with the delivery reel base 1. Then, after that, re-inversion is performed for 0.06 seconds in S4 and S5. At this time, the re-inversion time is set to a time shorter than the previous inversion time. The reason is that the speed of the capstan motor is almost constant due to the reversal, and the idler gear can be moved in a short reversal.

As described above, the tape drive control device of the present invention is not a brake by a mechanism using a cam and a frictional force, but a motor reversal and re-reversal.
The idler gear that transmits the driving force to the reel base applies a brake to both the feed reel base and the take-up reel base by engaging the gears.
Then, when the start and end are detected while the tape is running at high speed, the motor is reversed, the idler gear is engaged with the feed gear to stop the rotation of the feed reel, and then the motor is reversed again and the reel on the take-up side is reeled. Engage the stand and idler gear to stop the reel stand on the winding side. In the brake mechanism configured in this manner, the reversal of the motor can react more quickly and the braking mechanism that uses the engagement of the gears has a faster reaction speed and a higher braking force than the braking of the mechanism by the movement of the cam. A stable tape drive control device can be realized.

Although the case of detecting the end of the tape during fast-forwarding has been described, it goes without saying that the same process can be used to detect the start of the tape when rewinding the tape.

[0024]

As described above, in the tape drive control device of the present invention, the rotation of the reel base is stopped by the engagement of the idler gear with the gear of each reel base. Therefore, the tape type, the mechanical system load, and the motor load are changed. It is possible to provide a magnetic tape device having a braking mechanism with a stable braking force that is not affected.
In addition, since the reverse mechanism of the motor is used instead of the booching mechanism having a slow reaction speed such as the cam mechanism, it is possible to realize a tape drive device having a fast reaction speed and a stable brake mechanism.

As described above, since the braking force is stable and the reaction speed is fast, the tape can be stably and quickly stopped at the start end and the end when the tape is fast-forwarded. It can prevent damage. Further, since a complicated brake mechanism such as a cam mechanism is not required, a small and inexpensive tape drive device can be provided.

[Brief description of drawings]

FIG. 1 is a schematic view of a main part mechanism of a tape drive device of the present invention and a block configuration diagram of the main part.

FIG. 2 is a diagram for explaining an outline of a brake mechanism of the tape drive device of the present invention.

FIG. 3 is an operation flowchart of a brake mechanism of the tape drive device of the present invention.

FIG. 4 is a schematic view of a main part mechanism of a conventional tape drive device and a block configuration diagram of the main part.

FIG. 5 is an operation flowchart of a brake mechanism of a conventional tape drive device.

[Explanation of symbols]

1 Supply side reel stand 2 Take-up reel stand 3 capstan motor 4 Capstan motor controller 5 Capstan motor direction controller 6 Capstan motor inversion controller 7 Inversion time timer 8 Capstan motor re-inversion controller 9 Re-inversion time timer 10 Microcomputer 11, 12 Photo sensor 13 idler gear 14 main arm 15 Main cam 16 mode switch 17, 18 Friction brake 19 loading motor 20 Loading motor controller 21 Capstan motor direction reversing part 22 cassettes 23 tapes 24 cylinders

Continued front page    F term (reference) 5D081 EE03 EE09 EE13                 5D105 AC01 AE17 AE18 AF30 BB06                       BB07 BC11 BC23 BD01

Claims (5)

[Claims] 1. A motor for driving a tape, a rotation control means for controlling a rotation direction of the motor, a feed reel stand for feeding a tape, a take-up reel stand for winding, and a rotation of the motor. It has an idler gear transmitting means for transmitting to the reel stand and an end detecting means for detecting the end of the tape. When the end detecting means detects the tape end of the tape during high speed tape feeding, the rotation direction control means The tape drive control device is characterized in that the rotation direction of the motor is changed by the above, the idler gear means is engaged with the reel stand, and the feed reel stand and the take-up reel stand are alternately stopped. 2. A motor for driving the tape, a rotation control means for controlling the rotation direction of the motor, a feed reel stand for feeding the tape, a take-up reel stand for winding the tape, and a rotation of the motor. It has an idler gear transmitting means for transmitting to the reel stand and an end detecting means for detecting the end of the tape. When the end detecting means detects the tape end of the tape during high speed tape feeding, the rotation direction control means To reverse the rotation direction of the motor for a first predetermined time and engage the idler of the idler gear means with a reel base which is not driven, and then re-invert the motor again for a second predetermined time and move the idler gear. A tape drive control device characterized by being engaged with a reel stand on the opposite side. 3. The tape drive device according to claim 2, wherein the second predetermined time period is shorter than the first predetermined time period. 4. The tape drive control device according to claim 2, further comprising timer means for measuring a reversal time of the motor. 5. A motor for driving the tape, a rotation control means for controlling the rotation direction of the motor, a feed reel stand for feeding the tape, a take-up reel stand for winding, and a rotation of the motor. In a tape drive control method of a tape drive control device having an idler gear transmission means for transmitting to the reel stand and an end detection means for detecting the end of the tape, the end detection means is a tape end of the tape during high speed tape feeding. Is detected, the rotation direction control means changes the rotation direction of the motor, the idler gear means is engaged with the reel base, and the feed reel base and the take-up reel base are alternately stopped. Tape drive control method.