JPS60191458A - Tape driving mechanism of magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To reduce the thickness and weight of the tape driving mechanism by employing such structure that a power transmission mechanism for driving a tape is not stacked on a driving shaft. CONSTITUTION:When the magnetic recording and reproducing device is in recording/playback mode, a DD motor is powered on through mode changing operation and a pinch roller 7 is pressed against a capstan 6 to clamp the tape; and a gear 35 is engaged with a gear 31 and a gear 40 is engaged with the gear 5-1 of a reel deck 5. When the DD motor is rotates as shown by (a), the capstan 6 is driven to run the tape, and power is transmitted from the gear 31 to the gear 35 and then transmitted to a gear 32. A friction clutch 34 is interposed between the gears 32 and 33 to transmit optimum torque required to take up the tape 10 fed from the capstan 6 and the power is transmitted to the reel deck 5. The tape 10 is driven by the capstan 6 and pinch roller 7 and taken up around a reel mounted on the reel deck 5. Consequently, only one driving means for the reel deck is required and provided at nearly the same height with a friction clutch rotor.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a tape drive mechanism for a magnetic recording/reproducing device using magnetic tape, and 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 for magnetic recording and reproducing apparatuses (referred to as Sakashita VTRs) that use magnetic tape as a recording medium.

(】) Recording in which a magnetic tape is held between a capstan and a pinch roller, the tape is run at a constant speed by the constant speed drive of the capstan, and the tape is fed out from the capstan and wound onto a reel via a torque limiter. /First mode of play and cue.

(2) As in the first mode, the rotation direction of the capstan is reversed while holding the tape, and the reel that was on the feeding side in the recording/playback mode is driven in the opposite direction to wind the tape. mode.

(3) In addition to driving by the capstan and pinch roller, the third mode is a fast forward and seven rewind mode in which the reel is directly driven to run the tape.

In order to realize these modes, various tape drive systems have been proposed, and the simplest drive system involves installing two dedicated motors on the shaft of the reel stand in addition to the capstan drive motor. There is an example in which this occurs directly on the tape feed Jl motor shaft during winding of the tape fed out from the capstan and during fast forwarding and rewinding.

In this case, the range of rotation speed of the motor for driving the reel is wide (3 when winding the tape fed by the capstan and when fast forwarding and rewinding.
(There is a rotational speed difference of 0 times or more), making it difficult to employ an efficient motor. Additionally, since no speed reduction mechanism is interposed between the motor and the reel stand, a low rotational speed, high torque motor is required, resulting in an increase in the diameter and weight of the motor.

In order to overcome this drawback, it is easy to think that it would be sufficient to adopt a system in which one motor drives the tape in each mode. In other words, the capstan is driven by a motor, and two types of transmission systems are provided for driving the reel from the motor shaft of the motor or the capstan shaft of the capstan, and the tape winding (torque limiter) is installed in the recording/playback mode. It is conceivable that a method may be adopted in which the tape is wound in the fast forward and seven rewind modes (without using the torque limiter).

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 placed, 3 is a cassette (indicated by a two-dot chain line), 4 and 5 are reel stands, 6 is a capstan, and 7 is a pinch roller.

Further, 8.9 is a tape pull-out member for drawing out the tape 10 from the cassette 6 and winding it around the cylinder 2 in a spiral manner (this operation is called loading), and 11 and 12 are for positioning the tape pull-out member 8.9. He is a catcher. Furthermore, 13 is a motor for driving the capstan 6 and reel stands 4 and 5, and 14 is a motor for performing loading operation and mode switching operation. The cylinder 2 on which the video head is mounted is driven by a cylinder motor provided coaxially with the cylinder.

Next, the tape drive mechanism in this system will be explained. An outline of the drive mechanism is shown in FIGS. 2, 3, and 4. FIG. 2 is a plan view of the components showing the recording/reproducing mode state. Further, FIG. 3 is a side view showing the main parts thereof, and FIG. 4 is a side view showing the state in the fast forward 7 rewind mode.

As is clear from Fig. 3 or 4, the motor 5
A pulley 15 is press-fitted into the rotating shaft of the engine, and a flywheel 16 is press-fitted into the shaft of the cab tongue. A gear portion 16-1 is provided on an end surface of the flywheel 16, and a boob portion 16-2 is provided on the opposite end surface. A belt 1 is connected between the pulley 15 on the motor shaft and the flywheel 160.
7 is applied to transmit 30 rotations of the motor to the flywheel 16 and capstan 6.

A gear 18 and a boolean IJ 19 are coaxially provided near the flywheel 16, and the gear 18 meshes with or disengages from a gear portion 16-1 provided on the flywheel depending on the mode operation. Power is transmitted between the pulley 9 and the pulley 20 by a belt 21.

The pulley 20 is press-fitted onto the shaft 22, and the gear 23 is integrally attached to the shaft 22. Therefore, the gear 23 rotates together with the rotation of the pulley 20, and drives the swing idler 24 meshed with the gear 23. The swinging idler 24 is connected to the upper gear 4-1. of the reel stand 4.5 for feeding or winding depending on the mode operation. Alternatively, it is engaged with 5-1 or held at a position intermediate therebetween, and transmits or disconnects power.

The pulley 16- provided at one end of the flywheel 16
A belt 26 is provided between the pulley 25 and the pulley 25. A gear 27 is provided coaxially with the pulley 25, and a gear 28-
It meshes with 1. A swinging idler 29 meshes with a gear 28-2 that is provided integrally with the gear 28-1.
The idler 29 moves the reel stand 4 by switching the mode.
．． 5 lower gears 4-2, 5-2 or each intermediate position to transmit or disconnect power.

Note that the lower gears 4-2 and 5-2 of the reel stand 4.5 are connected to the upper gear 4 of the reel stand via friction clutches 30, respectively.
It is installed coaxially with -1 or 5-1. Furthermore, although the gears 28-1 and 28-2 are coaxial with the shaft of the tool 1J20, they are driven independently of the pulley 20.

Next, the operation in record/playback and cue mode is explained in the second step.
This will be explained with reference to the drawings and FIG. When the motor 13 is driven with the tape 10 held between the pinch roller 7 and the capstan 6, the flywheel 16 is driven by the belt 17, and the rotation of the capstan 6 moves the tape 10 in the direction (during recording/playback). (tape running direction). The rotation of pulley 16-2 is caused by belt 2.
6 through pulley 25. Gear 27. Gear 2B-1, 2
8-2° swinging idler 29. Lower gear 5- of reel stand 5
It is passed on to 2. Rotation is transmitted from the lower gear 5-2 of the reel stand to the upper gear 5-1 via a friction clutch,
The take-up reel is driven according to the tape speed fed out by the capstan 6 and pinch roller 7, and the tape 10 is
Roll it up without any slack.

To drive the tape in the review mode, the motor 13 is rotated in the opposite direction to that during recording/playback, and the swinging idler 29 is moved toward the reel stand 4 and engaged with the reel stand lower gear 4-2 to drive the tape 10. driving and winding.

Next, the tape drive in the fast forward 7 rewind mode is set to 4.
This will be explained using figures. In the fast forward 7 rewind mode, mode operation releases the tape from being pinched by the pinch roller 7 and capstan 6, and the gear 1B
is meshed with the gear portion 16-1 of the flywheel 16.

Further, the position restriction of the swing idler 24 is released and it is brought into mesh with the lower gear of the reel stand.

Now, the motor 5 is moving in the fast forward direction (in this example, recording/
When the motor 13 is driven in the same direction as during playback), the rotation of the motor 13 is caused by the flywheel 16, gear section 16-1, gear 18, pulley 19. The belt 211 is transmitted to the pulley 20 and the gear 23, and the tape 10 is wound from the reel stand 4 side to the reel stand 5 side by matching the oscillating idler 24 pipe reel meshed with the gear 23.

At this time, the swing idler 29 is regulated in position at the center of both reel stands and does not transmit power. The rewinding operation is performed by rotating the motor 6 in the opposite direction to that during fast forwarding and engaging the swing gear 24 with the reel base 4 side.

According to this method, the power transmission paths for driving the reel stand during recording/playback mode and during fast forwarding and rewinding are mutually independent, and in order to drive the reel stand by each power transmission path, the reel stand must be There is no choice but to arrange the driven part in the rotational thrust direction of the motor, and furthermore, a torque limiter must be provided between the two driven parts. For this reason, the reel white text becomes high, making it difficult to shorten the distance between the cassette and the board.

The capstan shaft also includes a belt 17 for driving the capstan 6, and a gear portion 16-1 for fast forwarding 7 and rewinding.
and belt 26 for left-handed drive during recording/playback mode.
are necessary, and these must be placed in the axial thrust direction. Further, the thrust receiver 16-6 of the flywheel 16 provided on the capstan shaft must also be provided on the capstan shaft. For this reason, the board 1 and the thrust receiver 16-
This has the disadvantage that the distance between the three parts becomes large, making it difficult to downsize the mechanism.

[Object of the Invention] It is an object of the present invention to provide a tape drive mechanism for a magnetic recording/reproducing device that eliminates the above-mentioned drawbacks and is suitable for miniaturization.

[Summary of the invention]

The feature of the present invention is that the power transmission mechanism for driving the tape is
By creating a stacked structure on the drive shaft, the mechanism can be made thinner and lighter.

[Embodiments of the invention]

Hereinafter, one embodiment of the tape drive mechanism of the magnetic recording/reproducing apparatus according to the present invention will be described with reference to FIGS. 5, 6, and 7.

5 and 6 are plan views showing the main parts 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, a reel stand on which reels of 4 and 5 tapes are placed, 6 is a capstan, and 7 is a pinch roller. These parts are the same or equivalent to those of FIGS. 1-4.

In this embodiment, a rotor 41 of a direct drive motor (hereinafter abbreviated as DI motor) is provided coaxially with the capstan 6.
and a stator 45 are provided.

A gear 32 and a gear 33 are coaxially provided near the rotor 41 via a clutch 34. A gear 35 that meshes with the gear 32 is held so as to be able to engage and detach from the gear 31 provided on the rotor 41, and the power from the gear 61 is intermittent by a mode switching operation. Furthermore, a gear 36 and a pulley 37 are integrally provided near the gear 63.

The gear 66 is held in such a way that it can engage and disengage from the gear 31 provided on the rotor 41 while always meshing with the gear 36, and is connected to and disconnected from the gear 31 by a mode switching operation. The pulley 67 is connected to the pulley 38 by a belt 39.

A gear 42 is mounted on the same axis of the boot 1J38, and the gear 42 rotates as the pulley 38 rotates. A gear 40 is held so as to be transferable while meshing with a gear 42,
The gear 40 is held in either a position where it meshes with the gear portions 4-1, 5-1 of the reel stands 4, 5 or in a position where it does not mesh with both gear portions, depending on the mode switching operation.

Next, the operation of this embodiment having the above configuration will be explained. FIG. 5 shows the state of the tape drive section in the recording/reproducing mode. When the tape is passed through the DD motor by the mode switching operation, the pinch roller 7 is brought into pressure contact with the capstan 6, thereby pinching the tape. At the same time, the gear 35 is engaged with the gear 61, and the gear 40 is engaged with the gear 5-1 of the reel base 5.

Next, when the DD motor is rotated in the direction of arrow A, the capstan 6 provided coaxially is driven, and the two tapes held between the capstan 6 and the pinch roller 7 are driven. On the other hand, gear 3 meshed with gear 51
5, power is transmitted from gear 31, and the power is transmitted to gear 32.

A friction clutch 34 is interposed between the gear 32 and the gear 3-1, and the friction clutch 34 transmits the optimum torque required to wind up the tape 10 fed out from the capstan 6. The power is from gear 33, gear 36, pulley 3
7, belt 39, pulley 3B, gear 42, gear 401
It is transmitted to the reel stand 5.

Through the above operations, the tape 10 is driven by the capstan 6 and the pinch roller 7, and the tape 10 fed out from the capstan portion is wound onto a reel placed on the reel stand 5.

In the review operation, with the pinch roller 7 in full pressure contact with the capstan 6 and holding the tape, the DD motor is rotated in the opposite direction to that in the record/7fJ raw mode (in the direction of the mouth in the fifth factor). At the same time, this is realized by moving the gear 40 toward the reel stand 4 side. Note that the gear 40 moves toward the reel stand 4 side by the mode switching operation.

FIG. 6 shows the state of the tape drive unit in the fast forward seven rewind mode. By the mode switching operation, the gear 36 is engaged with the gear 31, the gear 40 is moved toward the reel stand 5, and the DD motor is rotated in the direction of the arrow C in FIG. At this time, the pinch roller 7 is not pressed against the capstan 6, and the gear 35 is not engaged with the gear 31.

The rotation of the DD motor is controlled by gear 61, gear 36, pulley 37,
Belt 39. Pulley 38, gear 42, gear 40. It is transmitted to the reel stand 5. As is clear from the above, all of this power is transmitted without going through the friction clutch 34, and the tape is rapidly fed.

In addition, in the rewind mode, the gear 4o is
side, and the motor 13 is rotated in the opposite direction (in the two directions of the arrow) to that during fast forwarding. Thereby, the power of the motor 13 drives the reel stand 4 through the same transmission path as described above, and performs a rewinding operation of winding the tape onto the reel stand 4.

Although the above embodiment has been described as an example in which the gear 40 is moved by a mode switching operation, it is also possible to move the gear 40 automatically.

FIG. 8 shows a cross-sectional view of the sheep mechanism. As is clear from the figure, the gear 40 is attached to the end arm 46 with the gear 420 rotating shaft as the rotational fulcrum, and the gear 40
0 is pressed against the rubbing plate 44 and the arm 43 by a spring 46. Therefore, the arm 43 rolls in the same direction as the pulley 38 rotates, and as a result, the gear 40 also rolls, creating a so-called oscillating mechanism. Therefore, during recording/reproduction, 1ffi! Gear 40 in the same direction as 1st turn
can automatically roll and engage the reel stand in the transfer direction.

In addition, although the above embodiment has been described by taking as an example the configuration of a so-called capstan direct drive in which the stator 45 is provided facing the rotor 41 provided on the axis of the capstan 6, the present invention is not limited to this. , the capstan 6 may be driven by the same drive method 5 as shown in FIG.

According to this embodiment with the above configuration, there is a fifth-order effect.

(1) D-D consisting of rotor 41 and stator 45
A first power transmission mechanism via the friction clutch 54 and a second power transmission mechanism not via the friction clutch 34 are provided around the motor, and these can be selected by a mode switching operation. In addition, only one system of the third transmission mechanism provided after the second transmission mechanism is sufficient.

Therefore, only one drive means is required in the axial direction of the reel stand 5, and the thickness is reduced as is clear from FIG. 3.4.

Further, the first and second power transmission mechanisms r6. n-n
Since it is disposed in a gap at the same height as the motor, which is inevitably generated when the motor is disposed, the space can be used effectively, and the thickness of the cab tongue in the axial direction can be reduced.

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

(3) Capstan l, f l) -D-11: In the case of direct drive overnight, the thrust receiver 16-
3'i is no longer required, so the thickness of the capstan 6 in one direction can be reduced accordingly.

〔Effect of the invention〕

According to the present invention, the drive means for the reel stand provided between the cassette and the board can be reduced to one, and the friction clutch (torque IJ transmitter) can be placed at almost the same height as the rotor provided on the capstan shaft. It becomes possible to provide Therefore, it is possible to reduce the distance between the cassette and the substrate and the thickness of the space required for locating the drive means below the substrate.

In addition, since only one power transmission system is required for driving the one-knob unit, it is effective in reducing the size and weight of the area below the board.

Furthermore, by employing a capstan direct drive configuration, it is possible to eliminate the thrust receiver provided on the capstan shaft, resulting in an effect of miniaturization, particularly thinning.

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

[Brief explanation of the drawing]

FIG. 1 is a plan view schematically showing the VTR, FIG. 2 is a plan view illustrating its tape drive unit, and FIGS. 3 and 4 are side views illustrating operations in recording mode and fast forward mode.
5 and 6 are plan views illustrating the operation of the tape drive mechanism according to an embodiment of the present invention in the recording mode and fast forward mode, and FIG. 7 is a side view of the tape drive mechanism according to the embodiment of the present invention. 8 are sectional views of essential parts showing a specific example of the swinging mechanism. 1... Board 2... Cylinder 3... Cassette 4.5... Reel stand 6... Capstan 15... Motor 51, 32.53.35.
36.40.42... Gear 34... Friction clutch 39... Be/l/) 41... Rotor 45...
Stator Representative Patent Attorney Akira Takahashi

Claims (1)

[Claims] (1) First mode of normal recording/playback and fast forwarding φ
In a tape drive mechanism of a magnetic recording and reproducing device that can realize a second mode such as rewinding, a rotating body that is coaxial with the capstan shaft and provided below the substrate, and a rotating body that can be secured to the outer periphery of the rotating body. and a first power transmitting means having a slip mechanism, a second power transmitting means connected to the first power transmitting means and driving the reel stand, and a second power transmitting means connected to the second power transmitting means and having the rotating body. a third power transmission means that can be engaged with the rotating body, and the engagement between the rotating body and the first and third power transmission means is selectively switched in accordance with the selection switching of the mode. A tape drive mechanism of a magnetic recording self-generating device characterized by the following. +21 A tape drive mechanism of a patented magnetic recording and reproducing device, characterized in that the rotating body is a rotor of a motor. {3} The magnetic recording and reproducing device according to claim 1 or 2, wherein the first and third power transmission means are arranged at almost the same height as the rotating body. The device's tape drive. (4) The tape drive mechanism of the magnetic recording FJ cooperative according to any one of claims 1 to 3, characterized in that there is only one driving means in the axial direction of the reel stand.