JPH04283453A - Tape traveling device and control method for the same - Google Patents

Abstract

PURPOSE:To reduce a tape load during an oscillating operation at the time of the inversion of a tape traveling, as for a device which uses a capstan motor as a means which drives a reel by an oscillating gear mechanism. CONSTITUTION:An oscillating gear 34 of the oscillating gear mechanism comes in contact with a winding reel 20 in order to rotate the winding reel 20 clockwise, by the rotation of a capstan motor 10 to an anticlockwise direction, at the time of the traveling of a tape 16 in a positive direction. At the time of the traveling of the tape 16 in an inverse direction, the capstan motor 10 is inversely rotated only in a time or by a rotational extent necessary for the oscillating gear 34 to be engaged with a transmission gear 36 at a supplying reel 18 side, and stopped in a short time. Afterwards, the capstan motor 10 is accelerated to a desired speed.

Description

[Detailed description of the invention]

0001

TECHNICAL FIELD The present invention relates to a tape transport device and its control method, and more specifically to a tape transport device and its control method in a magnetic recording/reproducing device that records signals on a magnetic tape and/or reproduces signals from the magnetic tape. Regarding control method.

0002

2. Description of the Related Art In a magnetic recording/reproducing device, such as a video tape recorder (VTR), a capstan motor for running a tape is also used to drive a reel of a tape cassette. In other words, by the oscillating gear mechanism,
The rotation of the capstan motor is transmitted to one of the take-up reel or the supply reel within the tape cassette. An oscillating gear mechanism consists of a main gear (sun gear) with a rotating shaft in a fixed position, and an oscillating gear (planetary gear) that revolves around the main gear in a direction that corresponds to the rotational direction of the main gear. ), in which the oscillating gear faces the take-up reel in one direction as it revolves around the main gear, and faces the supply reel (through a gear system, etc.) in the other direction.

[0003] The rotation of the capstan motor is transmitted to the main gear by a belt or the like, and when the capstan motor rotates forward, the oscillating gear rolls on the circumference of the main gear and performs winding. The take-up reel is rotated by facing the reel. When the capstan motor is rotating in the opposite direction,
It rolls in the opposite direction on the circumferential surface of the main gear, comes into contact with the supply reel, and rotates the supply reel.

0004

[Problems to be Solved by the Invention] In the conventional example, when the tape is run in reverse, the polarity of the drive current applied to the capstan motor is reversed, as shown in FIG. 4, and the capstan motor is instantly activated. It was rotating in the opposite direction. In FIG. 4, the vertical axis shows the rotation speed (or drive current), and the horizontal axis shows time. In the oscillating gear mechanism, as can be understood from the above explanation, it takes time for the oscillating gear to oscillate (from the supply reel to the take-up reel, or vice versa), and during the oscillation, both the supply reel and the take-up reel Not rotating. Nevertheless, because capstan motors are typically high torque motors that rotate instantaneously in opposite directions, high tension is exerted on the magnetic tape between the capstan and the take-up reel. This tension may damage the magnetic tape.

SUMMARY OF THE INVENTION An object of the present invention is to provide a tape transport device and a control method thereof that solve these problems.

[0006]

[Means for Solving the Problems] The present invention provides a capstan motor that drives a tape to travel, and a winding operation of a supply reel and a take-up reel of the tape according to the rotational direction of the capstan motor. A tape conveying device having a swinging mechanism that selectively rotates a reel on the side, and during tape running reversal operation, the capstan motor is rotated in the opposite direction for a period equivalent to the time required for the swinging motion of the swinging mechanism. It is characterized in that it stops for a short time after rotating, and then rotates toward a predetermined speed.

[0007]

[Operation] With the above means, the capstan motor is first rotated in reverse for the time required for the swinging operation, so the tape driving force during that time is small. Therefore, less load is applied to the tape than when the capstan motor is rotated in reverse all at once, and less damage is caused to the tape.

[0008]

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows a plan view of an embodiment of the present invention. 10 is a capstan motor, 12 is a capstan rotated by the capstan motor 10, 14 is a pinch roller that pinches the magnetic tape 16 between it and the capstan 12, 18 is a supply reel for the magnetic tape 16, and 20 is a magnetic A take-up reel for the tape 16, and 22 a rotating head drum. Magnetic tape 1 pulled out from supply reel 18
6 is wound around the rotary head drum 22 at a predetermined angle via a plurality of guide posts, and is taken up onto the take-up reel 20 via a tape drive section consisting of a plurality of guide posts, a capstan 12, and a pinch roller 14. It will be done.

Reference numeral 24 indicates a transmission gear that is always engaged with a gear (not shown) rotated by the capstan motor 10, and 26 is a main gear of the oscillating gear mechanism. The signal is transmitted to gear 26. An arm 32 is rotatably attached to a spindle 30, which is the center of rotation of the main gear 26, about the spindle 30, and an oscillating gear 34 is rotatably attached to the tip of the arm 32. . The oscillating gear 34 is the main gear 26
are in mesh with each other, and the arm 32 rotates around the main gear 26 while rolling. The direction of its revolution is the main gear 26
depends on the direction of rotation. The oscillating gear 34 meshes with the take-up reel at a predetermined position in one of the revolution directions, and is connected to the supply reel 18 via transmission gears 36 and 38 at a predetermined position in the other revolution direction.

Next, magnetic tape 1 is used for recording or reproduction.
The operation of this embodiment will be explained by taking as an example the case where the motor vehicle 6 is running in the forward direction at a predetermined speed and then is caused to run in the reverse direction for reverse playback. Once the tape cassette is loaded into position, the magnetic tape 16 is pulled out of the tape cassette by well-known arrangements and placed in a rotating head as shown in FIG.
It is wound around the drum 22. The capstan 12 and the pinch roller 14 sandwich the magnetic tape 16, and as the capstan motor 10 rotates counterclockwise, the capstan 12 also rotates counterclockwise, and the magnetic tape 16 is conveyed in the forward direction.

At this time, the transmission gear 24 is connected to the capstan.
It rotates clockwise according to the motor 10. This rotation is transmitted to the main gear 26 via the rubber belt 28, and the main gear 26 rotates clockwise about the shaft 30. Main gear 26
As a result of the clockwise rotation, the oscillating gear 34 revolves clockwise around the shaft 30, and comes into contact with and meshes with the take-up reel 20. The oscillating gear 34 can no longer revolve at the position where it contacts the take-up reel 20, and is therefore driven by the clockwise rotation of the main gear 26 to rotate counterclockwise. This rotation causes the take-up reel 20 to rotate clockwise, and the take-up reel 20 takes up the magnetic tape 16 pushed out from the capstan 12 and the pinch roller 14.

This prevents the magnetic tape 16 from sagging between the capstan 12 and the take-up reel 20. During this time, the supply reel 18 is freely rotating.

FIG. 2 shows the control timing of the capstan motor 10 when reversing tape running. Figure 2
The horizontal axis shows time, and the vertical axis shows the number of rotations (or drive current) in the forward or reverse direction. In response to the start of a rewind operation or a reverse regeneration operation, the direction of rotation of the capstan motor 10 is reversed (i.e., from counterclockwise to clockwise) (FIG. 2).
point A). However, as shown in FIG. 2, the time required for the oscillating gear 34 to move from the take-up reel 20 side to the supply reel 18 side, in other words, the oscillating gear 34 is moved from the take-up reel 20 side to the supply reel 18 side. for a time corresponding to the amount of rotation of the capstan motor 10 necessary to move the capstan to
The capstan motor 10 is rotated in the opposite direction (A to B in FIG. 2). Thereafter, it stops for a short time (B to C in FIG. 2), and then rotates in the opposite direction while gradually increasing the speed (from C in FIG. 2).

In the process in which the oscillating gear 34 moves from the take-up reel 20 side to the supply reel 18 side, the take-up reel 2
0 and the supply reel 18 are not rotating, but the capstan 12 is rotating, so tension is applied to the magnetic tape 16 on the tape running path between the capstan 12 and the take-up reel 20, as in the conventional example. It takes. However, in this embodiment, the time from A to B in FIG. It should not be large enough to cause damage. Furthermore, in this embodiment, the capstan motor 10 is stopped for a short period of time, and then gradually accelerated, in order to reduce the impact caused by the reversal operation of the reels 18, 20, the swing mechanism, and the transmission system of each part. . Figure 2
As shown in FIG. 3, the acceleration may be performed in stages, or as shown in FIG. 3, the acceleration may be performed continuously. The vertical and horizontal axes in FIG. 3 are the same as in FIG. 2.

The correspondence between the rotation speed of the capstan motor 10 and the rotation speed of the supply reel 18 or take-up reel 20 changes depending on the amount of supply or winding of the magnetic tape 16. Therefore, although the explanation is omitted, a sliding mechanism that absorbs these differences in rotational speed is included in the transmission system that transmits the rotation of the capstan motor 10 to the reel 18 or 20 (for example,
Needless to say, it is provided on the rubber belt 28).

In addition, the oscillating gear 34 and the take-up reel 2
0 and the transmission gear 36 are connected by a gear connection, but they may be connected by a friction connection through an elastic body such as rubber.

[0018]

[Effect of the invention] As can be easily understood from the above explanation,
According to the present invention, the load on the tape can be reduced when the tape runs in reverse. Therefore, tape running with less tape damage can be realized.

[Brief explanation of the drawing]

FIG. 1 is a plan view of an embodiment of the present invention.

FIG. 2 is a control sequence of the capstan motor 10 of this embodiment.

FIG. 3 is another control sequence of the capstan motor 10 of this embodiment.

FIG. 4 is a conventional control sequence of a capstan motor.

[Explanation of symbols]

10: Capstan motor 12: Capstan
14: Pinch roller 16: Magnetic tape 18: Supply reel 20: Take-up reel 22: Rotating head drum 24: Transmission gear 26: Main gear 28
: Rubber belt 30: Support shaft 32: Arm 34:
Swing gear 36, 38: Transmission gear

Claims (2)

[Claims] [Claim 1] A capstan that drives the tape to run.
A tape conveying device comprising a motor and a swinging mechanism that selectively rotates a reel on a winding operation side among a supply reel and a take-up reel of the tape according to the rotational direction of the capstan motor. Then, during the tape running reversal operation, the capstan motor is rotated in the opposite direction for a time equivalent to the time required for the swinging motion of the swinging mechanism, then stopped for a short time, and then rotated toward a predetermined speed. Characteristic tape conveyance device. [Claim 2] A capstan that drives the tape to run.
A tape conveyance device having a motor and a swinging mechanism that selectively rotates a reel on the winding operation side of the supply reel and take-up reel of the tape according to the rotation direction of the capstan motor, A control method for running the tape in reverse, in which the capstan motor is rotated in the opposite direction for a period equivalent to the time required for the swinging mechanism to swing, then stopped for a short period of time, and then turned to a predetermined speed. A method for controlling a tape conveying device, characterized in that the tape conveying device is rotated by the following steps.