JPH08129790A - Magnetic recording/reproducing device - Google Patents

Abstract

PURPOSE: To eliminate a slack of a tape with simple constitution without providing a brake mechanism. CONSTITUTION: At the time of moving from fast-feeding/fast-rewinding operation to reproducing operation, an idler gear 7 is engaged with a reel gear 9, and the idler gear 8 is engaged with the reel gear 10. Then, the reel gear 9 is rotary driven counterclockwise by rotary drive force of a flywheel, and the reel gear 10 is rotation driven clockwise by the rotary drive force of another flywheel. Thus, since both reels 21, 22 are rotary driven in the directions opposite to each other, the slack of the tape is eliminated.

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 for recording / reproducing a magnetic tape contained in a cassette by switching the magnetic tape to a fast-forward mode or a reproducing mode for running.

[0002]

2. Description of the Related Art In a conventional cassette type magnetic recording / reproducing apparatus, when the fast-forward (FF) mode or the fast-reverse (REW) mode is released and the mode is changed to the replay mode, the reel is rotated by the inertia (inertia) to cause There is a case where the tape in the cassette is slackened because the reel rotates excessively without stopping immediately, and the tape may be caught in the tape running mechanism. A brake mechanism for braking the stand is provided, and the reel stand is braked by the brake mechanism when the FF mode and the REW mode are released.

[0003]

However, when the brake mechanism is provided to prevent the slack of the tape as in the conventional example, there is a problem that the mechanism becomes complicated and expensive.

The present invention solves the above-mentioned conventional problems, and an object of the present invention is to provide a magnetic recording / reproducing apparatus capable of preventing slack of a tape without providing a brake mechanism.

[0005]

In order to achieve the above object, the present invention provides a first idler gear that can be meshed with a first reel gear and a second idler gear that can be meshed with a second reel gear. , A control for controlling the meshing of the rotation driving force transmitting means for transmitting the rotation driving force of the motor to the first and second idler gears, and the engagement between the first and second idler gears and the first and second reel gears. Means for rotating the first or second reel gear to rotate and drive the first idler gear by the control means during the transition from the fast-forwarding operation and the fast-returning operation to the reproducing operation. And the second idler gear is engaged with the second idler gear.
It is characterized in that it is meshed with the reel gear.

[0006]

The present invention has the above-described structure, and transmits the rotational driving force of the motor to the first or second idler gear through the rotational driving force transmission means, and the first or second reel gear is In order to drive both the first and second reel gears during the transition from the fast-forwarding operation and the fast-returning operation to rotate to the reproducing operation, the tape is wound on both reels, and the tape slack is removed. Is.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows an outline of a tape drive system.
In FIG. 1, reference numeral 1 is a pulley fixed to a rotation shaft of a motor, and reference numerals 2 and 3 are flywheels rotatably supported by a substrate. Gears 4 and 5 are integrally formed on the flywheels 2 and 3, respectively. ing. Reference numeral 6 denotes a belt wound around the pulley 1, flywheels 2 and 3, and the rotational driving force of the motor is the flywheels 2 and 3 via the belt 6.
Is transmitted to. Reference numerals 7 and 8 are idler gears rotatably supported by an idler gear plate (19 and 20 in FIG. 3), 9 and 10 are reel gears formed on a reel stand, and the idler gears 7 and the gears 4 of the flywheel 2 are When meshing with the reel gear 9, the rotational driving force of the flywheel 2 is transmitted to the reel gear 9, and when the idler gear 8 meshes with the gear 5 of the flywheel 3 and the reel gear 10, The rotational driving force of the flywheel 3 is transmitted to the reel gear 10.

FIG. 2 shows a head chassis block of this embodiment. In FIG. 2, reference numeral 11 denotes a head chassis slidably supported on the substrate, and a magnetic head (not shown) is attached to the head chassis 11. Arrow A
Indicates the direction in which the head chassis 11 slides. The head chassis 11 is another motor (not shown).
It is driven by the driving force of (1) and slides in the direction of arrow A. Reference numeral 12 denotes an L-shaped relay gear plate rotatably supported on the head chassis 11 by a pin 13, and a relay gear 14 is rotatably supported at one end of the relay gear plate 12. The relay gear 14 can mesh with the gear 5 of the flywheel 3 when the head chassis 11 slides. 15
Is a switching gear rotatably supported by the head chassis 11 for switching the traveling direction, and two cutouts are formed on the outer peripheral gear surface of the switching gear 15. Reference numeral 16 is a cam groove formed in the switching gear 15. Reference numeral 17 denotes a switching plate slidably supported by the head chassis 11, and the switching plate 17 is a sliding direction of the head chassis 11 (arrow A).
Slide in the direction (arrow B) orthogonal to the direction. The pin 18 formed on the switching plate 17 is inserted into the cam groove 16 of the switching gear 15. When the relay gear 14 meshes with the gear 5 of the flywheel 3, the rotational driving force of the flywheel 3 is transmitted to the gear 5 → the relay gear 14 → the switching gear 15, and the switching gear 15 rotates. When the switching gear 15 rotates, the pin 18 inserted in the cam groove 16 is driven and the switching plate 17 slides in the direction of arrow B.

In FIG. 3, 19 and 20 are shafts 2 on the substrate.
The idler gear plate is rotatably supported by 1, 2 and the idler gears 7, 8 are rotatably supported by the idler gear plates 19, 20. The idler gear plates 19 and 20 are urged by springs (not shown) in directions toward each other. FIG. 3 shows a state at the time of playing. Since the switching plate 17 is located at the position moved to the right, the idler gear plate 20 is rotated counterclockwise by the right corner of the switching plate 17, and Since the idler gear plate 19 is not driven by the left corner of the switching plate 17, the idler gear 7 meshes with the gear 4 of the flywheel 2 and the reel gear 9, and the reel mount of the reel gear 9 is driven to rotate. (A-side reproduction).

Next, the operation of the above embodiment will be described.
When the traveling direction is switched in the play state shown in FIG. 3, the head chassis 11 slides in the direction of arrow a as shown in FIG. When the head chassis 11 slides in the direction of arrow a, the relay gear 14 meshes with the gear 5 of the flywheel 3. Therefore, the rotational driving force of the flywheel 3 is transmitted to the gear 5 → the relay gear 14 → the switching gear 15, and the switching gear 15 rotates clockwise as shown in FIG. Therefore, the switching plate 17 slides leftward. When the switching plate 17 slides to the left, the idler gear plate 19 is driven by the left corner of the switching plate 17, and the idler gear plate 19 rotates clockwise. Therefore, the meshing of the idler gear 7 with the reel gear 9 and the gear 4 is released. When the switching plate 17 moves leftward, the drive of the idler gear plate 20 that was driven at the right corner of the switching plate 17 is released, and the idler gear plate 20 is rotated clockwise by the urging force of the spring, and the idler gear plate 20 is rotated. 8 meshes with the gear 5 of the flywheel 3 and the reel gear 10. Therefore, the rotational driving force of the flywheel 3 is transmitted to the gear 5 → the idler gear 8 → the reel gear 10, and the reel base of the reel gear 10 is rotationally driven (B-side reproduction). 3 to 6 are from A-side reproduction to B-side.
This is an explanation of switching to surface playback.
F) and fast reverse (REW) operations are also performed by the same mechanism as the reproduction operation. However, during FF and REW, the rotation speed of the motor is higher than that during reproduction.

Next, the operation of removing the slack of the tape will be described with reference to FIGS. FIG. 7 shows the FF operation state. In the state shown in FIG. 7, the idler gear 7 is the gear 4,
It meshes with the reel gear 9. When switching from the FF operation to the play operation, the head chassis 11 moves in the direction of arrow a. FIG. 8 shows a state where the head chassis 11 is moving in the direction of arrow a.
At the same time, since the switching plate 17 also moves in the direction of arrow a, the idler gear plate 20 rotates clockwise in accordance with the movement of the switching plate 17, and the idler gear 8 meshes with the gear 5 and the reel gear 10. That is, during the movement of the head chassis 11 in the direction of the arrow a, the idler gear 7 meshes with the gear 4 and the reel gear 9, and the idler gear 8 meshes with the gear 5 and the reel gear 10, as shown in FIG. In the state shown in FIG. 8, the reel gear 9 is rotationally driven counterclockwise by the rotational driving force of the flywheel 2, and the reel gear 10 is rotationally driven clockwise by the rotational driving force of the flywheel 3. Since both reels 21 and 22 are rotationally driven in opposite directions as shown, the magnetic tape 23 is wound around both reels 21 and 22, and the slack of the magnetic tape 23 is removed. is there.
FIG. 10 shows the relationship between the position of the magnetic head 24 that moves together with the head chassis 11 and the operation mode. F
The position of the magnetic head during F, REW operation is play (PLA
When the FF / REW operation is shifted to the play (PLAY) operation, the position is slightly moved in the direction of arrow a from the position of Y), and the mode is switched from the FF / REW position to the mode switching position in FIG. After the mode is switched at the position, the play (PLAY) position is reached, and the tape slack removal state shown in FIG. 8 is reached during the transition from the FF and REW positions to the mode switching position.

As described above, in the above embodiment, FF, R
During the transition from the EW operation to the play operation, both reel bases are rotationally driven in opposite directions, so FF and RE
The tape slack due to the inertia of the reel that occurs when the W operation shifts to the play operation is removed.

[0013]

As is apparent from the above embodiment, the present invention has the advantage that the tape slack can be removed by utilizing the tape drive mechanism without adding a brake mechanism.

[Brief description of drawings]

FIG. 1 is a top view showing a tape drive system of a magnetic recording / reproducing apparatus according to an embodiment of the present invention.

FIG. 2 is a top view of the head chassis block of the same embodiment.

FIG. 3 is a top view showing a traveling direction switching unit of the embodiment.

FIG. 4 is a top view showing a traveling direction switching operation of the embodiment.

FIG. 5 is a top view showing a traveling direction switching operation of the embodiment.

FIG. 6 is a top view showing a traveling direction switching operation of the embodiment.

FIG. 7 is a top view showing a tape slack removing part of the embodiment.

FIG. 8 is a top view showing a tape slack removing operation of the embodiment.

FIG. 9 is a top view showing a running state of the tape of the example.

FIG. 10 is a top view showing the relationship between the position of the magnetic head of the embodiment and the operation mode.

[Explanation of symbols]

 1 Pulley 2, 3 Flywheel 4, 5 Gear 6 Belt 7, 8 Idler Gear 9, 10 Reel Gear 11 Head Chassis 12 Relay Gear Plate 13 Pin 14 Relay Gear 15 Switching Gear 16 Cam Groove 17 Switching Plate 18 Pin 19, 20 Idler Gear Plate 21,22 reel 23 magnetic tape 24 magnetic head

Claims (2)

[Claims] 1. A first idler gear that can mesh with a first reel gear, a second idler gear that can mesh with a second reel gear, and a rotational driving force of a motor to the first and second idler gears. The rotation driving force transmitting means for transmitting the rotation driving force and the control means for controlling the meshing between the first and second idler gears and the first and second reel gears are provided. The first idler gear is meshed with the first reel gear by the control means and the second idler gear is moved to the second idle by the control means during the transition from the fast-forwarding operation and the fast-returning operation for rotating to the reproducing operation.
Magnetic recording / reproducing apparatus characterized in that it is meshed with the reel gear. 2. The magnetic device according to claim 1, further comprising control means for controlling engagement between the first and second idler gears and the first and second reel gears in accordance with the sliding movement of the head chassis. Recording / playback device.