JPH0249253A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To simplify structure and to reduce the number of components by transmitting the rotation of a motor to a driving pulley directly or via a slipping mechanism. CONSTITUTION:When an operating button of FF(REW) is depressed in a stopping mode, a mode switching motor 40 performs rotary driving in a counterclockwise direction observing from a pulley 42 side. A shaft 47 is turned around bearings 48 and 49 with a worm 50, which turns a cam gear 51. The contact with reel boards 2 and 3 of the brake shoes 72b and 73b of arms are disconnected, and braking by the pressing force of a spring 74 applied on them are released. When a stopping operation is performed in an FF/REW mode, energizing to a motor 4 is released, then, the motor 40 is rotated in a reverse direction. The turning of braking arms 72 and 73 are recovered by the spring 74, which applies the braking on the reel boards 2 and 3. Thus, the fast feed of a tape in the FF/REW mode can be released, then, the tape is stopped in a moment. In such a way, the structure can be simplified and the number of components can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic recording and reproducing apparatus (hereinafter referred to as a VTR) that magnetically records and reproduces data by bringing a magnetic head into contact with a magnetic tape wound on two reels.

Conventionally, there are two types of reel drive systems for VTRs: one uses a motor as a power source to drive a capstan for feeding the tape at a constant speed, and the other uses a motor exclusively for driving only the reel. On the other hand, the reel drive is FF (fast forward)/
At least two types of supply are required: strong torque during REW (rewinding) and weak torque with a slip mechanism or torque limiter used during constant speed playback. Therefore, the former method provides a transmission path that supplies strong torque to the reel and a transmission path that supplies weak torque via a slip mechanism, and each transmission path is selected depending on the mode.

By the way, in order to remotely control this selection operation (performed by simply switching a switch), a power source is required, and constant speed playback can be forwarded or
When reversing in both directions, a slip mechanism is required for each reel, and at the same time, a total of four types of transmission system selection operation means are required: FF, REV, forward regeneration, and reverse regeneration, and the mechanism is complicated. Become.

There are two methods for the latter method: one is to use a total of two dedicated motors for each reel, and the other is to drive each reel via an oscillating idler with a single motor that can rotate in forward and reverse directions. These methods change the torque by controlling the supply voltage, but these methods have the disadvantage that they require an extra high-performance motor with less torque ripple and are expensive because they require a control circuit. there were.

The present invention was conceived in view of the above situation, and
It is an object of the present invention to provide a VTR having a reel drive device that can be easily assembled, the number of parts can be significantly reduced, and the mode transmission path can be easily controlled remotely.

In the present invention, a drive shaft that drives both reels via an oscillating idler is disposed at a predetermined position, and a first transmission path that directly transmits the drive shaft from a first motor capable of forward and reverse rotation. , a second transmission path configured to obtain a predetermined torque via a slip mechanism, and a second motor configured to rotate by a predetermined amount in each operation mode. The first and second transmission paths are selected by the cam body driven through the reducer end and the operating force of the lever driven by the cam body, and one of the transmission paths is selected in each mode. The reel can be driven in either direction depending on the rotation direction of the first motor along the route.

An embodiment of the present invention will be described below with reference to the drawings (FIGS. 1 to 9). FIG. 1 is a plan view of the entire VTR mechanism showing one embodiment of the present invention, showing the stop mode, and FIG. 2 is the back side thereof. In FIG. 1, the chassis 1 includes a pair of reel shafts 2a,
3a, and reel stands 2 and 3 are rotatably attached to each. Reference numeral 4 denotes a reversible motor mounted on the chassis 1, and as shown in FIG. A belt 8 is stretched between the flywheel 7 and the flywheel 7 attached to the flywheel 7. The shaft 9 is a fixed shaft provided on the sub-chassis 10L which is fixed to the chassis 1, on a substantially perpendicular bisector of both wheels, and the drive pulley 10 rotates as shown in detail in FIGS. 3 to 6. The oscillating rear idler arm 11 is also rotatably attached.

As is clear from FIGS. 3 to 6, the oscillating idler arm 11 has a shaft 11 (Z) that rotatably supports the idler 12. The arm 11 and the idler 12 are , a spring 14, a spring seat 15, and a stopper 16 to provide a predetermined friction torque necessary for swinging the arm. Reference numeral 17 is a washer having a long hole 17c, and a hole 17b provided at one end is a washer. A spring 18 is attached between the shaft 11a and the idler 1.
2 is constantly press-fitted to the drive pulley 10, and also serves as a stop 7 for attaching the oscillating rear idler arm 11 to the shaft 9 through a groove 9a formed in the shaft 9. Here, the spring 18 transfers the rotational force of the drive pulley 10 via the idler 12,
It is assumed that the pressing force is sufficient to sufficiently transmit drive to each reel stand 2, 3. Since the washer 17 rotates around the shaft 9 in conjunction with the swinging motion of the arm 11, the idler 12 and drive pulley 1o are always kept in a uniformly pressed state.

On the other hand, a belt pulley 19 is rotatably provided below the shaft 9, and a belt 20 is stretched between the large diameter part of the belt pulley 19 and the motor pulley 5, and a subchassis is attached to the small diameter part. The belt 2 is connected between the gear pulley 24, which is rotatably provided on the shaft 21 provided on the shaft 1α, and the machining pulley 22, which is rotatably supported on the hollow shaft portion 240L of the gear pulley 24.
3 is hung. The gear pulley 24 and the machining pulley 22 include felt washers 25, 26, pressure plates 27, and springs 28. A predetermined torque can be obtained by a coupling having a ready-made structure including the stopper 29.

Reference numeral 31 denotes a switching pulley that is rotatable and movable up and down about the shaft 9, and as shown in detail in FIG. 7, the arm portion 31 (L and , an engagement I#31b that can be rotatably coupled by engaging with an inner circumferential rib portion 19a provided on the belt pulley 19 and the subchassis 1.
A gear portion 31c that can mesh with an idler gear 30 that is rotatably provided with respect to a shaft 30a that is erected on the shaft 30a is provided.
It is always engaged with the gear part 24b formed at 4. In FIG. 4, when the switching pulley 31 is at a height such that the gear portion 31c and the idler gear 30 are engaged, the engagement tooth 3
1b and the rib portion 19c of the belt pulley 19 is in a released state, and conversely, as shown in FIG. Part b and 19c
When the height relationship is such that the t part is engaged, the gear part 31
c is configured to be disengaged from the idler gear 30. In FIG. 7, the arm portion 3 of the switching pulley 31
A relatively small diameter cylindrical portion 31 is located between the 1oL and the gear portion 31c.
d, and a C-shaped ring 32 made of an elastic material such as plastic is attached. At this time, the inner diameter and axial height of the C-shaped ring 32 are set to have a predetermined clearance with the outer diameter and axial height of the cylindrical portion 31d of the switching pulley 31, respectively. Further, the C-shaped ring 32 is provided with protrusions 32c and 32d.

It fits into an oblong hole 33a provided in a switching arm 33 rotatably attached around a pin 34 set on the sub-chassis 1a.

A pin 37 is further installed on the sub-chassis 1α, and a cam arm 35 is rotatably provided around this pin. One arm is attached to the subchassis 1a and the upper stopper pin 38, and the other arm is attached to the switching arm 33 by passing through a hole 33b provided therein. Therefore, in FIGS. 3 and 4, the switching arm 33 is connected to the pin 34.
A counterclockwise rotating force is applied around the sub-chassis 1α, and the sub-chassis 1α is positioned by a stopper 39 provided on the sub-chassis 1α. On the other hand, one arm of the spring 36 is sandwiched between the ribs 35c of the cam arm 35, and the attitude of the cam arm 35 is also determined at the same time in FIG.

In FIGS. 1 and 2, reference numeral 40 denotes a mode switching motor, which is attached to the chassis 1 via a bracket 41.

A motor pulley 42 is fixed to the output shaft 40α, and a belt 43 is connected to the motor pulley 42 and a shaft 41c on the bracket 41.
It is stretched between the large diameter portion of a pulley 44 that is rotatable around L.

The shaft 47 is supported by bearings 48 and 49 fixed on the substrate, and a pulley 46 and a worm 50 are fixed thereto.

Further, a belt 4 is connected between the small diameter portion of the pulley 46 and the pulley 44.
5 is stretched, so that the rotational force of the mode switching motor 40 can be transmitted to the worm 50. A cam gear 51 is rotatably provided around a shaft 51cL on the chassis 1, and a screw gear on the outer periphery that meshes with the worm 5o and receives rotational drive, and a plurality of cam grooves A and B (not shown) on the plane. It is formed. A pin 52b provided on a lever 52 rotatable about a shaft 52a on the chassis l is engaged with the cam groove A, but another pin 52c provided on the lever 52 is provided so as to be slidable. The mode slider 53 is loosely fitted and connected to the mode slider 53, which is fitted with the knob portion 54a of the mode switch 54. Here, the mode switch 54 has a plurality of built-in contacts, and controls at least the energization state of the mode switching motor 40.The positions of the contacts are determined in advance in accordance with each operation mode, and thereby each operation mode -Mode switch switch 40 for each mode. In other words, the shape of the cam groove A is determined so as to ensure a predetermined amount of rotation of the cam gear 51. Further, a pin 56b provided on a mode switching lever 56 that is rotatable around a shaft 56a on the chassis 1 is engaged with the cam groove B, and the mode switching lever 56 is rotated by the cam gear 51 which rotates a predetermined amount depending on each mode. The shape of the cam groove B is set so that it takes the necessary displacement.

The pin 56d provided on the mode switching lever 56 moves counterclockwise around the axis 56+z in FIG. 2 due to the rotation of the cam gear 51, but the relative relationship with the cam arm 35 described above is shown in FIGS. and here pin 5
6d rotates clockwise and approaches a convex cam portion 35c formed on the cam arm 35. Here, 35c and pin 56
It is assumed that d has a height relationship that allows contact.

Further, another pin 56e provided on the mode switching lever 56 engages with a cam groove 66c of a lever 66 that is rotatable around a shaft 66α on the chassis 1, and a pin 66b on the lever 66 engages with a cam groove 66c of a lever 66 that is rotatable around an axis 66α on the chassis 1. The slider 67 is loosely connected to the chassis 1 and is slidably guided by a pin 67a on the chassis 1. Also, the slider 67 has a pin 67b.
is planted and an elongated hole 67c is provided.

70 is a brake operation slider provided with a pin 70a,
This is fitted into and guided by the elongated hole 67c of the slider 67 and is slidable by being guided by the pin 67ct, and the lock arm 69 is attached to be rotatable about the pin '70a. A spring 6 is connected between the lock arm 69 and the chassis 1.
8 is biased, the lock arm 69 is moved clockwise, and the brake operation slider 70 and the lock arm 69 are integrally always biased in the direction of the biasing force of the spring 68, and are positioned by the pin 67b. Brake operation slider 70
A pin 71b provided on a swing arm 71 rotatable about a shaft 71c on the chassis 1 extends so as to be able to come into contact with the slope 70b.

In FIG. 1, reference numerals 72 and 73 indicate brake arms, which are rotatable around shafts 72 (Z and 73c) on the chassis, and brake shoes 7 that abut against the outer peripheries of the reel stands 2 and 3, respectively.
2b, 73b Furthermore, the boss portion 71 of the hexagonal arm 71
arm portions 72c and 73c that can come into contact with c. or,
A spring 74 is stretched between the brake arms 72 and 73, and biases the brake arms 72 and 73 to rotate counterclockwise and clockwise, respectively.

On the other hand, in FIG. 2, a latch pulley 75 configured as a ready-made one-way clutch using a coil spring is provided on the shaft 47.
When moving from the position shown in the figure in the direction opposite to the biasing direction of the spring 68, the bent portion 69 (Z) can be contacted and the shaft 47 is
It is assumed that the latch pulley 75 is set to receive the rotational force of the shaft 47 in the direction of rotation from the /REV mode to the stop mode, and to slip and not be transmitted in the direction of rotation from the stop mode to the FF/REW mode.

Next, a loading mechanism for pulling the tape out of the cassette 115 and an unloading mechanism for storing the tape in the cassette 115 will be explained with reference to FIGS. 8 and 9. cam gear 51
The outer periphery of the small diameter portion 51b ↓ This is where a gear is formed and the chassis 1
It meshes with a gear 76 that is rotatable around an upper shaft 76a. A drive arm 77 is rotatably attached to the shaft '76a, and an arm 78 is rotatably connected to the drive arm 77 by a pin 79, and a spring push arm 81 is rotatably connected to the drive arm 77 by a pin 8°. The spring pusher arm 81 has a push spring 82 between it and the drive arm 77.
It is configured so that it can come into contact with a pin 76b that is set on the gear 76 while holding the pin 76b. On the other hand, the arm 78 is connected to a tape guide 82 that pulls out the tape and guides the tape along a predetermined path.
．． 83 is placed thereon and is rotatably connected to a boss portion 84a of a guide member 84 that is slidably attached along a guide groove 85 provided in the chassis 1. Similarly, a quick-acting arm 86 is rotatably attached to the shaft 51c, and an arm 88 is rotatably connected to the drive arm 86 by a pin 87, and a spring push arm 90 is rotatably connected by a pin 89. There is. The spring push arm 90 has a push spring 92 sandwiched between it and the drive arm 86, and is configured to be able to come into contact with a pin 51c set on the cam gear 51. On the other hand, the arm 88 is further rotatably connected to an arm 94 by a pin 93, and the arm 94 is connected to a guide groove provided in the chassis 1 in which a tape guide 95° 96 for pulling out the tape and guiding the tape along a predetermined path is mounted. The guide member 97 is rotatably connected to a boss portion 97c of a guide member 97 that is slidably attached along the guide member 97. or.

The arm 88 is provided with a pin 99 and configured to be guided by a guide groove 100 on the chassis 1.

In FIG. 1, the guide members 84, 97 are the tape guides 82, 83, 95, 9 on which the 5 tape guides are placed during recording, playback, etc.
6 pulls out the tape in the cassette 115 and fixes the tape guide 104. Erase head 105. Impedance roller 1069 rotating head cylinder 101. Audio control head 1o7. When loading the fixed guide 108 into a predetermined path, the position is determined by stoppers 102 and 103 fixed on the chassis 1.

Further, the tension arm 109, which is rotatable around the shaft 1090L on the chassis 1, has a pin 110 planted therein.
Band brake 111. A ready-made tension servo mechanism is constructed using a spring 112, and after loading the tape, the tension arm 109 rotates counterclockwise so that the pin 110 comes into contact with the tape.

On the other hand, the elongated hole 56c provided in the mode switching lever 56 is connected to levers 57 and 58 that are rotatable about shafts 57c and 58a on the chassis 1, respectively, and the groove 58b of the lever 58 allows the pin 59 to be opened. It is configured. Returning to FIG. 1, the pin 59 connects the arm 60 that can rotate around the shaft 60CL on the chassis 1 and the shaft 62b on the chassis 1.
Pin 6 on pinch roller arm 62 that can rotate around
This is a pin that rotatably connects the link 61 that is rotatably connected to 2α, a spring 64 is stretched between the chassis 1 on the arm 60, and 65 is a stopper for the arm 60 on the chassis 1. A shaft 62c is mounted on the pinch roller arm 62 and rotatably supports the pinch roller 63.

Next, the operation of the configuration of the present invention described above will be explained. When the FF (REW, ) operation button (not shown) is pressed from the stop mode in Fig. 1, the mode switching motor 4
0 in FIG. 2, rotational drive is performed in the counterclockwise direction when viewed from the pulley 42 side. As a result, the pulley 46 transfers the turbulent force of the pulley 42 to the belt 43. Pulley 44. The shaft 47 which is integrally fixed to the belt 45 rotates together with the worm 50 around the bearings 48 and 49, causing the cam gear 51 to rotate clockwise in FIG. 2 around the shaft 51oL. Drive rotation. At this time, the lever 52° mode switching lever 56 is connected to the cam groove A-B of the cam gear 51 and the pin 52b of each lever.
, 56b rotate counterclockwise, and the slider 67 begins to slide against the road force by the pin 66b. As a result, the lock arm 69 and the brake slider 70 move together with the slider 67 by the pin 67b while stretching the spring 68. As a result, the slope 70b of the brake slider 70 comes into contact with the pin 71b of the hexagonal arm 71, and the hexagonal arm 71
When the arm 71c of the brake arm 72.73 receives a rotational force counterclockwise in Fig. 2 and clockwise in Fig. 1, the arm 7 of the brake arm 72.
2c.

73c to rotate each arm clockwise and counterclockwise, respectively. As a result, the brake shoes 72b and 73b of each arm are cut off from contact with the reel stands 2 and 3, and the braking caused by the biasing force of the spring 74 is released.

On the other hand, the pin 56d on the mode switching lever 56 rotates counterclockwise in FIG. 2 and clockwise in FIG.
The cam arm 35 is rotated clockwise to reach the state shown in FIG. 5. Also, motor 4
is rotated counterclockwise in FIG. 2 in the FF mode and clockwise in the REV mode, and the rotation is transmitted to the belt pulley 19 in each direction via the belt 20, but in FIG. , represents the FF mode, and the belt pulley 19 is being driven clockwise.

Here, due to the rotation of the cam arm 35 mentioned above, the switching lever 33 is displaced clockwise via the spring 36 as shown in FIG. Since the side l\ is pushed down, the rotational force of the belt pulley 19 is switched! The signal is transmitted to the drive pulley 10 via J31, and the idler 12 rotates counterclockwise, causing the idler arm 11 to swing clockwise, eventually driving the reel stand 3 to rotate clockwise. In this way, a tape fast-forwarding operation in the forward direction is performed.

On the other hand, in the REV mode, the rotational force of the belt pulley 19 is switched by simply reversing the rotational direction of the motor 4, and the idler 12 rotates the reel stand 2 counterclockwise via the pulley 31 and the drive pulley 10. A tape fast-forward operation in the reverse direction is performed. Also, until this state is reached, the cam gear 51
When the lever 52 rotates, the lever 52 also continues to rotate counterclockwise.
The mode switch 54 is set to FF via the mode slider 53.
The contact point set to /REW is reached and the mode switching motor 4o is de-energized. Also, by rotating the cam gear 51 to this FF/REW mode, the mode switching lever 56
The levers 57 and 58 interlocked with the elongated hole 56c, the pinch roller arm 62, and the tape loading mechanism shown in FIG. 7 will be slightly displaced from the state shown in FIG. It is set to be within a range that does not cause any problems.

If you perform a stop operation from the FF/REV mode mentioned above,
When the power to the motor 4 is removed, the mode switching motor 40 is driven to rotate in the opposite direction. As a result, the cam gear 51 starts rotating in the 84 direction during reversal via the worm 50 in FIG. Because it is displaced, the latch pulley 7 is rotated at the same time as the mode switching motor 40 is reversed.
The claw 5 contacts the part 69a and locks the lock arm 69 with the spring 6.
Rotate counterclockwise against the force of 8. This results in
The lock arm 69 is released from the lock at the pin 67b and integrally returns substantially downward to the brake slider 70 by the force of the spring 68, returning to the state shown in FIG. Accordingly, since the rotation arm 71 is also released from being suppressed by the pin 71b, it rotates counterclockwise in FIG. Brake 3. In this way, the tape high-speed feeding during FF/REV is canceled and the tape stops instantaneously. Further, as the mode switching lever 56 returns to rotation, the pin 66d is displaced from FIG. 5 to FIG.
The pressure at is released and returned by the force of the spring 36, and the state shown in FIG. 4 is reached where the switching lever 33 is finally positioned by the stopper 39. On the other hand, as shown in FIG. 2, the pin 56e also rotates the arm 66 clockwise and displaces the slider 67 downward, but eventually the pin 67b locks the lock arm 69 by the rotation urging force of the spring 68. Become. At this time, the lever 52 is also rotated back by the rotation of the cam gear 51, and the mode switch 54 is also returned to the contact point set in the stop mode, so that the rotation of the mode switching motor 40 is also stopped.

Next, the operation when a recording/playback operation button (not shown) is pressed will be explained. Here, the contact position of the mode switch 54 in the recording/reproducing mode is further ahead than in the FF/REW mode, so that the amount of rotation of the mode switching motor 40 can be further obtained.

That is, when the recording/reproducing operation button is pressed, the braking of the reel stands 2 and 3 is first released as in the FF/REW described above. However, at this time, the motor 4 is not yet rotated, and as the mode switching motor 40 continues to rotate, the pins 51c and 76b in FIG. Push the arm 90°81 and then press the spring 92.92'
The drive arms 86 and 77 are rotated counterclockwise and clockwise, respectively. As a result, the guide member 97
Driven via arms 88, 94, tape guide 95
．． 96 pulls out the tape in the cassette 115. Similarly, guide member 84 is driven via arm 78 and tape guide pins 82, 83 pull out the tape within vessel 115.

As the mode switching motor 4o further rotates, the guide members 97, 84 continue to move along the guide grooves 98, 85 on the chassis 1, and eventually come into contact with the stoppers 103, 102, and are positioned at a predetermined position. ,96,8
A predetermined tape running path is formed by 2.83. At this time, the push spring 92°92' is deflected by a predetermined amount to exert a pressing force against the stopper 103°102, thereby maintaining the posture of the guide member 97°84. On the other hand, when the pin 56d of the mode switching lever 56 is near the FF/REW mode, as shown in FIG.
As shown in FIG. 6, the transmission path of the switching pulley 31 is switched, but when the mode switching lever 56 is rotated further, the pin 56d is disconnected from the cam portion 35cm of the cam arm 35, and the cam arm 35 is connected to the spring 36. The biasing force restores the state shown in FIG. 3, and the transmission path of the switching pulley 31 also returns to the state shown in FIG. 4.

Thereafter, since the motor 4 is switched to start rotating, the rotational force transmitted to the belt pulley 19 is transmitted to the machining pulley 22 by the belt 23, and the felt 25.26° crimp plate 27 and the spring 28
, a predetermined rotation via a friction mechanism consisting of a stopper 29 is transmitted from the machining gear 24 to the switching pulley 31 via the idler gear 30, thereby rotationally driving the drive pulley 10. At this time, as in the case of FF/REW, the idler 12 drives one of the reel stands 2 and 3 in rotation depending on the rotational direction of the motor 4. Further, as the motor 4 rotates, the flywheel 7 is simultaneously moved rapidly by the belt 8. However, in order to synchronize the timing of the reel stand drive of the idler 12 with the start of immediate tape movement by the capstan 6 and pinch roller 63, which will be described later, an inhibit mechanism (not shown) works to restrict the movement of the idler arm 11. There is.

On the other hand, the lever 57. which is fitted and connected through the long hole 56c of the mode switching lever 56. Furthermore, the lever 58 interlocked with this pushes the pin 59 to the right in FIG.
Gradually rotate 2 counterclockwise. Guide member 97.8
4 reaches the stopper 103°102, the pinch roller 63 comes into contact with the capstan 6 across the pulled out tape, and when the pin 59 is further pressed, the arm 6
begins to rotate clockwise against the force of the spring 64, and as a result, the pinch roller 63 presses the tape against the capstan 6 by the force of the spring 64 and begins to drive at a constant speed.

At the same time, the aforementioned inhibition of the idler arm 11 is canceled and the driving of the reel stand 2 or 3 is also started. At this time, when the motor 4 is rotating clockwise in FIG. 1, both the capstan 6 and the reel stand 3 are given clockwise rotation, and the tape runs forward, and when the motor 4 is rotating counterclockwise, Both the capstan 6 and the reel stand 2 are rotated counterclockwise, resulting in reverse running.

When the cam gear 51 rotates until the pinch roller 63 is pressed, the lever 52 also continues to rotate counterclockwise in FIG. At this point, the mode switching motor 40 is de-energized and stops. Here, since the rotational force of the mode switching motor 40 is transmitted through a deceleration mechanism including a worm 50 and a cam gear 51, the state in which the pinch roller 63 is pressed and the guide members 97.84 are pressed against the stoppers 103 and 102 is controlled by the mode switching motor 40. is maintained sufficiently even after it is stopped.

Next, the operation of performing a stop operation from recording/playback will be explained. When a stop button (not shown) is pressed, the mode switching motor 40 starts rotating in the opposite direction to that when loading the tape, and the motor 4 starts rotating in the same direction as when running in reverse. As a result, the cam gear 51 rotates counterclockwise in FIG. 2, so the mode switching lever 56 rotates clockwise.
The pressure of the pinch roller 63 is released. Further, in FIG. 1, the cam gear 51 rotates clockwise and the gear 76 rotates counterclockwise, thereby releasing the guide members 97, 84 from the stoppers 103, 102 and starting to move backward. At the same time, the reel stand 2 is driven counterclockwise by the rotation of the motor 4 through the transmission path via the slip mechanism shown in FIG. Roll it into the cassette 115 like this. As the unloading operation progresses in this way, the pin 56d will eventually reach the cam portion 35cm of the cam arm 35.
3, but the cam arm 35 is rotated slightly counterclockwise in FIG. However, this displacement is
If part a slightly bends one arm of the spring 36, the contact between the pin 56d and the cam part 35cm disappears.
It is returned again by the force of the spring 36 and reaches the posture shown in FIG. Further, in this process, since the switching arm 33 remains in the posture shown in FIG. 4, all transmission paths are via the slip mechanism, and slack in the tape is taken up.

When the mode switching lever 56 reaches the vicinity of the FF/REV mode, the lock arm 69 of the latch pulley 75 is released, and the brake arms 72 and 73 are activated, just as in the case of stopping from FF/REW.・3 is braking. Furthermore, when the pinch roller arm 62 and the guide member 97.degree. 84 are also returned to the state shown in FIG. 1, the power supply to the mode switch and 40 is also cut off and stopped. Furthermore, although the explanation is omitted here, it is possible to perform high-speed reproduction in forward and reverse directions using this device as well.

According to the present invention, it is possible to provide an inexpensive and remotely controllable device in which tape disturbance corresponding to each operation mode can be dealt with using two motors, a tape movement motor and a mode switching motor. Furthermore, since no electromagnet is used, power consumption is low, making it suitable for portable type magnetic recording and reproducing devices powered by batteries.

As described in detail above, the girdle driving device of the present invention has a simple structure and has the advantage of reducing the number of parts.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing a VTR mechanism to which an embodiment of the present invention is applied, FIG. 2 is a rear view of FIG. 1, and FIG. reproduction)
A diagram showing the mode, Figure 4. Diagram showing the FF mode in Figure 6.
The figure is a side view of Figure 5 showing the FF/REV mode, Figure 7 is a detailed diagram of the torque transmission path switching mechanism element, and Figure 8 is a detailed diagram of the tape loading and unloading mechanism. FIG. 9, which shows the mode, is a side view of FIG. 8. 2: Motor (first motor), 2/3: Reel stand, 10: Drive pulley, 9: Shaft,
11: rotating plate, 12: idler,
19: belt pulley, 40: mode switching motor (second motor), 51: cam body. 50.42-46: Reduction mechanism, 56: Mode switching lever 82.83, 95, 96: Magnetic tape drawer member, 8
4.97: Guide member, 76: Gear 54: Mode changeover switch. Yuzu

Claims (1)

[Claims] 1. A first motor 4 that can rotate in forward and reverse directions, a drive pulley that can rotate around a shaft 9 provided approximately on the perpendicular bisector of the pair of reels, and a rotation that rotates around the shaft. Board 11
An idler 12 is rotatably connected to the drive pulley and rotates the pair of reels, and the rotary plate is rotated in the rotational direction of the drive pulley, and the idler on the rotary plate rotates each reel. a swing idler device configured to rotationally drive one of the reels of the first motor; a first transmission path that directly transmits the rotation of the first motor 4 to the drive pulley 10; a second transmission path that transmits rotation to the drive pulley via a slip mechanism that obtains a predetermined output torque; a transmission path selection mechanism that can select one of the transmission paths; and a transmission path selection mechanism that is compatible with a plurality of operation modes. a mode switch having a plurality of contact positions; a second motor capable of forward and reverse rotation controlled by the mode switch to rotate by a predetermined amount for each operation mode; and a cam body driven by the rotation of the second motor. and a mode switching member that operates in conjunction with the cam body to take a predetermined displacement, and the mode switching means is coupled to the transmission path mechanism to perform each of the operations. A magnetic recording/reproducing device characterized in that a necessary transmission path can be selected according to a mode.