JPH0630188B2 - Tape drive - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tape drive mechanism of a magnetic recording / reproducing apparatus using a magnetic tape, and more particularly to a tape drive mechanism suitable for miniaturization and thinning.

[Background of the Invention]

Conventionally, there are the following three types of tape drive modes of a magnetic recording / reproducing apparatus (hereinafter referred to as VTR) using a magnetic tape as a recording medium.

(1) A magnetic tape is held by a capstan and a pinch roller, the tape is run at a constant speed by the capstan's constant speed drive, and the tape fed from the capstan section is wound on a reel via a torque limiter for recording / playback. And the first mode of cue.

(2) Similar to the first mode, while holding the tape, the capstan rotation direction is reversed and the reel that was the feeding side in the recording / reproducing mode is driven in the reverse direction to wind the tape. Mode.

(3) Third mode of fast forward / rewind in which the reel is directly driven to run the tape in addition to the drive by the capstan and the pinch roller.

In order to realize these modes, various tape drive systems have been proposed. As the simplest drive system, two dedicated motors are provided on the reel stand shaft in addition to the capstan drive motor. This is an example in which the winding of the tape fed from the capstan and the tape feeding at the time of fast forward / rewind are performed directly on the motor shaft.

In this case, the range of use of the rotation speed of the motor for driving the reel is wide (30 times when winding the tape fed by the capstan and when fast-forwarding / rewinding).
It is difficult to adopt an efficient motor that has more than double the rotational speed difference. In addition, since there is no speed reduction mechanism between the motor and the reel stand, a low rotation speed and high torque type motor is required, which results in an increase in the diameter and weight of the motor.

In order to solve this drawback, it is easily conceivable that a method of driving the tape in each mode by one motor may be adopted. That is, the capstan is driven by the motor, and two types of transmission systems for driving the reel from the motor shaft of the motor or the capstan shaft of the capstan are provided to wind the tape in the recording / reproducing mode (torque limiter It is conceivable that a method of winding the tape (through the torque limiter) in the fast feed / rewind mode is used.

A specific example of the above method that can be easily conceived by those skilled in the art will be described below with reference to the drawings.

FIG. 1 is a plan view illustrating the outline of a VTR. In the figure, 1 is a substrate, 2 is a cylinder on which a video head is mounted, 3 is a cassette (shown by a chain double-dashed line), 4 and 5 are reel stands, 6 is a capstan, and 7 is a pinch roller. Further, 8 and 9 are tape pull-out members for spirally winding the tape 10 from the cassette 3 around the cylinder 2 (this operation is called loading), and 11 and 12 are for positioning the tape pull-out members 8 and 9. It is a catcher who does. Further, 13 is a motor for driving the capstan 6 and the reel stands 4 and 5, and 14 is a motor for performing a loading operation and a mode switching operation. The drive of the cylinder 2 on which the video head is mounted is
This is done by a cylinder motor provided coaxially with the cylinder.

Next, the tape drive mechanism in this system will be described. The outline of the driving mechanism is shown in FIGS. 2, 3, and 4. FIG. 2 is a plan view of components showing the state of the recording / reproducing mode. Further, FIG. 3 is a side view showing the main part thereof, and FIG. 4 is a side view showing the state of the fast forward / rewind mode.

As is clear from FIG. 3 or FIG. 4, the pulley 15 is press-fitted into the rotary shaft of the motor 13, and the flywheel 16 is press-fitted into the shaft of the capstan 6. A gear portion 16-1 is provided on the end surface of the flywheel 16, and a pulley portion 16-2 is provided on the opposite end surface. Pulley on motor shaft
A belt 17 is hung between the flywheel 16 and the flywheel 16, and transmits the rotation of the motor 13 to the flywheel 16 and the capstan 6.

A gear 18 and a pulley 19 are coaxially provided near the flywheel 16, and the gear 18 engages or disengages with a gear portion 16-1 provided on the flywheel by mode operation. Pulley
A belt 21 transmits power between the pulley 19 and the pulley 20. The pulley 20 is press fitted into the shaft 22, and the gear 23 is integrally attached to the shaft 22. Therefore, the gear 23 rotates with the rotation of the pulley 20, and drives the swing idler 24 meshed with the gear 23. Swing idler 24
Is engaged with the upper gears 4-1 or 5-1 of the reel bases 4 and 5 for sending or taking up by the mode operation or held at an intermediate position between them to transmit or disconnect power.

Further, a belt 26 is provided between the pulley 16-2 provided at one end of the flywheel 16 and the pulley 25. A gear 27 is provided coaxially with the pulley 25 and meshes with the gear 28-1. A swinging idler 29 is meshed with a gear 28-2 provided integrally with the gear 28-1, and the idler 29 is operated by a mode switching operation to lower gears 4-2 of the reel stands 4 and 5.
5-2 or an intermediate position between them is used to transmit or disconnect power.

The lower gears 4-2 and 5-2 of the reel bases 4 and 5 are respectively connected via the friction clutch 30 to the upper gears 4- of the reel base.
It is attached in the same manner as 1 or 5-1. Also, the gear 28
-1 and 28-2 are coaxial with the axis of pulley 20
Driven independently of 20.

Next, the second operation in the recording / playback and cue modes
This will be described with reference to FIGS. With the pinch roller 7 and the capstan 6 holding the tape 10, the motor
When 13 is driven, the flywheel 16 is driven by the belt 17, and the tape 10 is fed in the forward direction (the tape running direction during recording / reproduction) by the rotation of the capstan 6. The pulley 16-2 is rotated by the belt 26 via the belt 26.
5, the gear 27, the gears 28-1 and 28-2, the swing idler 29, and the lower gear 5-2 of the reel stand 5. Rotation is transmitted from the lower gear 5-2 of the reel base to the upper gear 5-1 via a friction clutch, and the take-up reel is driven according to the tape speed delivered by the capstan 6 and the pinch roller 7. Wrap Tape 10 without sagging.

To drive the tape in the review mode, the motor 13 is rotated in the opposite direction to that during recording / reproduction, and the swing idler 29 is moved toward the reel base 4 to move the reel base lower gear 4
The tape 10 is driven and wound by engaging with -2.

Next, the tape drive in the fast forward / rewind mode is
It will be described with reference to the drawings. In the fast forward / rewind mode, the pinch roller 7 and the capstan 6 are operated by the mode operation.
The holding state of the tape by the
Are meshed with the gear portion 16-1 of the flywheel 16. Further, the position regulation of the swing idler 24 is released, and the swing idler 24 meshes with the upper gear of the reel stand.

Now, when the motor 13 is driven in the fast-forward direction (in this example, the same direction as during recording / reproduction), the rotation of the motor 13 causes the flywheel 16, the gear portion 16-1, the gear 18, the pulley 19, the belt 21, The tape 10 is wound from the reel stand 4 side to the reel stand 5 side by being transmitted to the pulley 20 and the gear 23, and engaging the swing idler 24 meshed with the gear 23 with the gear part 5-1 of the reel stand 5. .

At this time, the swing idler 29 is positioned at the center of both reel stands and does not transmit power. The rewinding operation is performed by the motor 13
Rotate in the direction opposite to that during fast-forwarding, and
Is engaged with the reel base 4 side.

According to this method, the power transmission paths for driving the reel base in the recording / reproducing mode and the fast forward / rewind are independent from each other, and the reel base is driven by each power transmission path. There is no choice but to arrange the driven part in the direction of the rotational thrust, and further to provide a torque limiter between the two driven parts. For this reason, the height of the reel becomes high and it is difficult to shorten the distance between the cassette and the substrate.

Further, the capstan shaft requires a belt 17 for driving the capstan 6, a gear portion 16-1 for fast-forwarding / rewinding, and a belt 26 for driving the reel in the recording / playback mode, These must be arranged in the axial thrust direction. Further, the thrust receiver 16-3 of the flywheel 16 provided on the capstan shaft must also be provided on the capstan shaft. Therefore, the distance between the substrate 1 and the thrust receiver 16-3 becomes large, and it is difficult to reduce the size of the mechanism.

[Object of the Invention]

An object of the present invention is to eliminate the above-mentioned drawbacks and provide a tape drive mechanism of a magnetic recording / reproducing apparatus suitable for miniaturization.

[Outline of Invention]

The present invention is characterized by the following points. That is, in the invention shown in FIG. 1, in a tape drive mechanism having a configuration for switching the running state of the tape corresponding to a plurality of device modes, a rotating portion (one embodiment reference numeral 41) coaxial with the capstan (one embodiment reference numeral 6) is provided. , 31) having a plurality of engaging rotary bodies (reference numerals 35 and 36) arranged substantially in the same plane at a predetermined angle from each other with respect to the center of rotation. Is configured to include a plurality of power transmission means (reference numerals 32, 33, 35, 36 of one embodiment) whose engagement with the rotating portion is selectively switched according to the device mode. According to the invention, in a tape drive mechanism having a configuration for switching the running state of a tape corresponding to a plurality of device modes, an outer peripheral portion of a rotating portion (reference numerals 41 and 31 of the embodiment) coaxial with a capstan (reference numeral 6 of the embodiment). To the rotation A plurality of engaging rotating bodies (reference numerals 35 and 36 in one embodiment) arranged at a predetermined angle with respect to the center and substantially in the same plane are provided, and the engaging rotating bodies are engaged with the rotating portion. A plurality of first power transmission means (reference numeral 32, 33, 35, 36) which are selectively switched according to the device mode, and a reel stand side connected to the plurality of first power transmission means Second power transmission means for transmitting power to the
39, 38, 42, 40).

Example of Invention

An embodiment of the tape drive mechanism of the magnetic recording / reproducing apparatus according to the present invention will be described below with reference to FIGS. 5, 6 and 7.
5 and 6 are plan views showing the main part of the tape drive mechanism, and FIG. 7 is a side view.

In these figures, 1 is a substrate, 2 is a cylinder, 3 is a cassette, 4 and 5 are reel stands for mounting reels of tape, 6 is a capstan, and 7 is a pinch roller. These parts are the same or equivalent to those in FIGS.

In this embodiment, a rotor 41 and a stator 45 of a direct-tribe motor (hereinafter abbreviated as DD motor) are provided coaxially with the capstan 6. A gear 32 and a gear 33 are coaxially provided near the rotor 41 via a clutch 34. The gear 35 that meshes with the gear 32 is the gear 31 provided on the rotor 41.
It is held so that it can be engaged and disengaged with
Intermittent power from 31. Also, place gear 36 near gear 33.
And the pulley 37 are integrally provided.

The gear 36 is engaged with and disengaged from the gear 31 provided on the rotor 41 while always meshing with the gear 33, and the connection with the gear 31 is interrupted by a mode switching operation. Pulley 37 is a pulley
It is connected by 38 and belt 39.

A gear 42 is attached coaxially with the pulley 38,
The gear 42 rotates with the rotation of. The gear 40 is rotatably held while meshing with the gear 42, and the gear 40 is operated by a mode switching operation so that the gear portion 4-1 or 5-
It is held at either a position where it meshes with 1 or a position where it does not mesh with both gear parts.

Next, the operation of this embodiment having the above configuration will be described. FIG. 5 shows the state of the tape drive section in the recording / reproducing mode. The DD motor is energized by the mode switching operation, and the pinch roller 7 is pressed against the capstan 6 to hold the tape. Gear 35 at the same time
The gear 40 meshes with the gear 31 of the reel base 5
Bite into 1.

Next, when the DD motor is rotated in the direction of arrow A, the capstan 6 provided coaxially is driven, and the tape held between the capstan 6 and the pinch roller 7 is driven. On the other hand, the power is transmitted from the gear 31 to the gear 35 meshing with the gear 31, and the power is transmitted to the gear 32.

A friction clutch 34 is interposed between the gear 32 and the gear 33, and the friction clutch 34 transmits the optimum torque required to wind up the tape 10 fed from the capstan 6.
The power is transmitted to the gear 33, the gear 36, the pulley 37, the belt 39, the pulley 38, the gear 42, the gear 40, and the reel stand 5.

By the above operation, the tape 10 is driven by the capstan 6 and the pinch roller 7, and the tape 10 delivered from the capstan portion is wound on the reel placed on the reel stand 5.

The review operation is performed in a state in which the pinch roller 7 is pressed against the capstan 6 and the tape is sandwiched between the DD motor and the direction opposite to that in the recording / reproducing mode (direction B in FIG. 5).
It is realized by rotating the gear 40 to the reel base 4 side while rotating the gear 40. The gear 40 moves to the reel stand 4 side by the mode switching operation.

FIG. 6 shows the state of the tape drive section in the fast forward / rewind mode. Change the gear 36 to gear 31 by the mode switching operation.
Gear 40 is moved to the reel stand 5 side, and the DD motor is rotated in the direction of arrow C in FIG. At this time, the pinch roller 7 is not pressed against the capstan 6 and the gear 35 is prevented from meshing with the gear 31.

The rotation of the DD motor is the gear 31, gear 36, pulley 37, belt
39, the pulley 38, the gear 42, the gear 40, and the reel stand 5. This power transmission is, as is clear from the above,
All are transmitted without passing through the friction clutch 34, and the tape is fast forwarded.

Further, in the rewinding mode, the gear 40 is moved to the reel stand 4 side, and the motor 13 is rotated in the direction opposite to the fast forward direction (arrow D direction). As a result, the power of the motor 13 drives the reel base 4 via the same transmission path as described above to perform the rewinding operation for winding the tape on the reel base 4.

Although the above embodiment has been described as an example in which the movement of the gear 40 is performed by the mode switching operation, the movement of the gear 40 can be automatically performed.

FIG. 8 shows a sectional view of the mechanism. As is clear from the figure, the friction plate is attached to the arm 43 whose rotation fulcrum is the rotation axis of the gear 42.
A gear 40 is attached via 44, and the gear 40 is pressed against the friction plate 44 and the arm 43 by a spring 46. Therefore, the arm 43 rolls in the same direction by the rotation of the pulley 38, and as a result, the gear 40 also rolls, which is a so-called swing mechanism. Therefore, the gear 40 automatically rolls in the same direction as the rotation of the gear 42 at the time of recording / reproducing, reviewing, and fast-forwarding / rewinding, and automatically engages with the reel base in the rolling direction. Can be done.

Further, although the above embodiment has been described by taking as an example a so-called capstan direct drive structure in which the stator 45 is provided so as to face the rotor 41 provided on the shaft of the capstan 6, the present invention is not limited to this. The capstan 6 may be driven by the same drive method as that shown in FIG.

According to this embodiment having the above configuration, the following effects can be obtained.

(1) A first power transmission mechanism via a friction clutch 34 around a DD motor including a rotor 41 and a stator 45,
Since the second power transmission mechanism which does not use the friction clutch 34 is provided and these can be selected by the mode switching operation, the third transmission mechanism provided at the subsequent stage of the first and second transmission mechanisms is The system is enough. For this reason, the driving means provided in the axial direction of the reel stand 5 is only one stage, and the thickness becomes thin as is clear from comparison with FIGS.

Further, since the first and second power transmission mechanisms are arranged in the air gap which is inevitably generated by disposing the DD motor and has the same height as the motor, space can be effectively utilized and the cap can be effectively used. The thickness of the stun 6 in the axial direction can be reduced.

(2) As is clear from comparing FIG. 7 and FIG. 3,
Since this embodiment has a small number of parts and has a simple structure, it has an advantage that it can be manufactured at low cost.

(3) When the capstan 6 is directly driven by the DD motor, the thrust receiver 16-3 is not needed, so that the axial thickness of the capstan 6 can be reduced accordingly.

[Effects of the Invention] According to the present invention, it is possible to use only one drive means for the reel base provided between the cassette and the substrate, and substantially the same as a rotor provided with a friction clutch (torque limiter) on the capstan shaft. Can be provided at the height of. Therefore, it is possible to reduce the distance between the cassette and the substrate and the thickness of the space required for disposing the driving means below the substrate.

Further, since only one power transmission path is required for driving the reel base, it is effective in reducing the size and weight of the board.

Further, by adopting the structure of the capstan direct drive, it is possible to eliminate the thrust receiver provided on the capstan shaft, which has an effect of downsizing, particularly thinning.

Moreover, since the number of parts of the power transmission mechanism is small, the device can be manufactured at low cost.

[Brief description of drawings]

FIG. 1 is a plan view showing the outline of a VTR, FIG. 2 is a plan view for explaining the tape drive unit, and FIGS. 3 and 4 are side views for explaining the operation in a recording mode and a fast-forward mode.
5 and 6 are plan views for explaining the operation of the tape drive mechanism according to the embodiment of the present invention in the recording mode and the fast-forward mode, and FIG. 7 is a side view of the tape drive mechanism according to the embodiment of the present invention. FIG. 8 is a cross-sectional view of the essential parts showing a specific example of the swing mechanism. 1 ... Substrate, 2 ... Cylinder 3 ... Cassette, 4,5 ... Reel stand 6 ... Capstan, 13 ... Motor 31,32,33,35,36,40,42 ...... Gear 34 ...... Friction clutch, 39 …… Belt 41 …… Rotor, 45 …… Stator

Claims (4)

[Claims] 1. A capstan that holds a tape between a pinch roller and runs at a constant speed, a first reel base that winds the tape in a winding direction, and a second reel base that winds the tape in a rewinding direction.
Equipped with a reel stand, the first mode in which the capstan is rotated in one rotation direction to record / reproduce the tape, and the second mode in which the capstan is rotated in the other rotation direction to review the tape.
Magnetic recording and reproducing that achieves the following modes, a third mode in which the first reel base is directly driven to fast forward the tape, and a fourth mode in which the second reel base is directly driven to rewind the tape. In the tape drive mechanism of the device, a rotating body provided coaxially with the capstan, a slip mechanism for transmitting the rotational force of the rotating body arranged in the vicinity of the rotating body in a slip state, and an input side of the slip mechanism. A first idler that is always engaged and is removable from the rotating body, a second idler that is constantly engaged to the output side of the slip mechanism and is removable from the rotating body, and the rotation of the second idler is on the reel stand. A magnetic recording / reproducing apparatus comprising: a rotation transmitting means for transmitting, and means for selectively switching the connection of the first idler and the second idler to the rotating body in response to the selective switching of the mode. Tape drive Mechanism. 2. The tape drive mechanism for a magnetic recording / reproducing apparatus according to claim 1, wherein the rotating body is a rotor of a motor. 3. The slip mechanism, the first idler, and the second idler are arranged at substantially the same height as the rotating body, and the slip mechanism, the first idler, and the second idler are arranged at the same height. A tape drive mechanism of the magnetic recording and reproducing apparatus described. 4. A tape drive mechanism for a magnetic recording / reproducing apparatus according to claim 1, 2 or 3, wherein there is one drive means for engaging with the reel stand.