JPH0610897B2 - Magnetic recording / reproducing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic recording / reproducing apparatus (hereinafter referred to as a magnetic recording / reproducing apparatus) having a loading means for loading a magnetic tape from a cassette by a pulling member into a predetermined tape traveling path of a rotary head cylinder in a recording / reproducing operation mode. (Referred to as VTR).

2. Description of the Related Art Conventionally, there are a reel drive system in a VTR, a system in which a motor for driving a capstan for tape constant speed feeding is used as a power source, and a system in which a motor for exclusively driving a reel is provided. On the other hand, the drive of the reel is FF (fast forward) /
At least two types of supply are required, a strong torque during REW (rewinding) and a slip mechanism used during constant speed reproduction, or a weak torque with a torque limiter. Therefore, in the former method, a transmission path for supplying a strong torque to the reel and a transmission path for supplying a weak torque via a slip mechanism are provided, and the transmission path is selected depending on the mode.

By the way, in order to make this selection operation a remote control (only by a simple switch operation), a power source is required respectively.
When performing in both directions of reverse, a slip mechanism for both reels is required respectively, and at the same time, the selection operation means of the transmission system also requires FF, REW, forward reproduction and reverse reproduction, a total of four types, which makes the mechanism complicated. Become.

The latter drive method includes a method of using a total of two dedicated motors for each reel, and a method of driving each reel via a swing idler with a single motor that can rotate forward and backward. Although it is a method of changing the torque by controlling the voltage, these methods have the disadvantage that they require an extra high-performance motor with less torque ripple than the former, and that they require a control circuit, which makes them expensive. .

The present invention has been made in view of the above circumstances,
It is an object of the present invention to provide a VTR having a reel drive device which has a simple structure and which can greatly reduce the number of parts and which can easily realize remote control of a mode transmission path.

The present invention is directed to a first motor capable of rotating in a forward and reverse direction, a drive pulley rotatable about an axis arranged between a pair of reel stands, a rotational direction of the drive pulley rotationally coupled to the drive pulley. And a first transmission path for transmitting the rotation of the first motor to one of the reel bases with a strong torque by rotating the one of the pair of reel bases according to And a second transmission path for transmitting the rotation of the first motor to one of the reel bases with a weak torque via a slip mechanism, and according to the switching between the fast forward / rewind operation mode and the recording / reproduction operation mode. A second motor capable of rotating in a fixed amount and configured to rotate in the forward and reverse directions, a cam gear driven by rotation of the second motor, and a fast drive driven in association with rotation of the cam gear. A transfer path selecting means for selecting the first transfer path in the rewind / rewind operation mode and for selecting the second transfer path in the recording / reproducing operation mode, and driven in association with the rotation of the cam gear. In the recording / reproducing operation mode, the magnetic tape is pulled out from the cassette by the pulling member and loaded into a predetermined tape running path, and loading means for performing loading operation, and the recording / reproducing operation driven in association with rotation of the cam gear. And a pinch roller moving means having a pinch roller for pressing the magnetic tape pulled out from the cassette to the capstan in the mode.

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 an embodiment of the present invention, showing a stop mode, and FIG. 2 is the rear surface thereof. In FIG. 1, the chassis 1 has a pair of reel shafts 2a,
3a is provided, and reel stands 2 and 3 are rotatably attached to the reel stands 2 and 3, respectively. Reference numeral 4 denotes a motor that is mounted on the chassis 1 and is capable of rotating in the forward and reverse directions. In FIG. 2, the motor pulley 5 is fixed to the output shaft 4a, the motor pulley 5 and the capstan 6 are fixed, and the motor 1 is rotatable with respect to the chassis 1. A belt 8 is stretched between the flywheel 7 and the flywheel 7. The shaft 9 is a fixed shaft provided on the sub-chassis 1a fixed to the chassis 1 on the substantially perpendicular bisectors of both reels, and the drive pulley 10 is rotatable as shown in detail in FIGS. In addition to being provided, the swing idler arm 11 is also rotatably attached. Third
As is apparent from FIGS. 6 to 6, a shaft 11a is erected on the swing idler arm 11 and rotatably supports the idler 12. The arm 11 and the idler 12 are coupled by a felt 13, a spring 14, a spring seat 15, and a stopper 16 so that a predetermined friction torque required for swinging the arm can be obtained. 17 is a long hole 17
A washer having a shaft 17 is provided in a hole 17b provided at one end.
A spring 18 is attached between the spring 18 and a, and the idler 12 is constantly pressed against the drive pulley 10 and also serves as a stopper 7 for attaching the swing idler arm 11 to the shaft 9 by the groove 9a formed in the shaft 9. ing. Here, it is assumed that the spring 18 has a pressing force sufficient to sufficiently transmit the rotational force of the drive pulley 10 to the reel stands 2 and 3 via the idler 12. Since the washer 17 rotates about the shaft 9 in association with the swinging motion of the arm 11, the idler 1 is always operated.
The pressed state of 2 and the drive pulley 10 is uniformly maintained.

On the other hand, a belt pulley 19 is rotatably provided below the shaft 9. A belt 20 is stretched between a large diameter portion of the belt pulley 19 and the motor pulley 5, and a sub chassis is provided in a small diameter portion. The belt 23 is provided between the hollow pulley 24a of the gear pulley 24 rotatably provided on the shaft 21a provided on the la 1a, and the matrix pulley 22 rotatably supported on the hollow shaft 24a.
Is stretched. Gapuri 24 and Makitori pulley 2
Reference numeral 2 is a coupling having an existing structure including the felt washers 25 and 26, the crimping plate 27, the spring 28, and the stopper 29 so that a predetermined torque can be obtained.

Reference numeral 31 is a switching pulley provided so as to be rotatable around the shaft 9 and movable up and down, and an arm portion 31a which is constantly engaged with a hole portion 10a provided in the drive pulley 10 as shown in detail in FIG.
Engagement with the inner peripheral rib portion 19a provided on the belt pulley 19 and engaging teeth 31b that can be rotationally coupled by engagement with the idler gear 30 that is rotatably provided on the shaft 30a that is planted in the sub chassis 1a. The respective gear parts 31c are provided, and the idler gear 30 always meshes with the gear part 24b formed on the gear pulley 24. In FIG. 4, the switching pulley 31 has a gear portion 31c and an idler gear 3
When there is a height relationship in which 0 is engaged, the engaging teeth 31b
And the rib portion 19a of the belt pulley 19 are disengaged, and conversely, as shown in FIG. 6, when there is a height relationship in which the 31b portion and the 19a portion are engaged, the gear portion 31c is idler. The gear 30 is configured to be disengaged. Also in FIG. 7, a cylindrical portion 31d having a relatively small diameter is formed between the arm portion 31a and the gear portion 31c of the switching pulley 31, and a C-shaped ring 32 formed of an elastic body such as plastic is attached. ing. C-shaped ring 3 at this time
The inner diameter and the axial height of 2 are respectively the switching pulley 31
It is assumed that the outer diameter and the axial height of the cylindrical portion 31d and the predetermined clearance are set. Further, the C-shaped ring 32 is provided with protrusions 32c and 32d, and is fitted with an elliptical hole 33a provided in a switching arm 33 that is rotatably attached around a pin 34 that is planted in the subchassis 1a. is doing.

A pin 37 is further erected on the sub-chassis 1a, a cam arm 35 is rotatably provided around this pin, and a coil portion of a spring 36 is fitted to a bearing boss portion 35b of the cam arm 35, so that one of the spring Is attached to the stopper pin 38 of the sub-chassis 1a, and the other arm is attached through a hole 33b provided in the switching arm 33. Therefore,
In FIGS. 3 and 4, the switching arm 33 is given a counterclockwise turning force around the pin 34, and the subchassis 1a is rotated.
It is positioned by a stopper 39 provided on the. On the other hand, one arm of the spring 36 is sandwiched by the rib 35a of the cam arm 35, and the posture of the calm arm 35 is also determined 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 40a, and the belt 43 is connected to the motor pulley 42 and the shaft 41a on the bracket 41.
It is stretched between a large diameter portion of a pulley 44 which is rotatable around. The shaft 47 is a bearing 48, 49 fixed on the substrate.
The pulley 46 and the worm 50 are fixedly supported by the shaft. A belt 45 is stretched between the pulley 46 and the small diameter portion of the pulley 44, and the mode switching motor 40
It is possible to transmit the rotating force of the to the worm 50. 51
Is a cam gear rotatably provided around the shaft 51a on the chassis 1, and has a screw gear that meshes with the worm 50 and is rotationally driven, and a plurality of cam grooves A and B on the plane.
(Not shown) is formed. A pin 52b provided on a lever 52 rotatable about a shaft 52a on the chassis 1 is engaged with the cam groove A, but another pin 52c provided on the lever 52 is slidably provided. The mode slider 53 is loosely fitted and connected, and the mode slider 53 is further fitted to the knob portion 54 a of the mode switch 54. Here, the mode switch 54 has a plurality of contacts built therein and controls the energization state of the mode switching motor 40 at least, and the positions of the contacts are determined in advance corresponding to each operation mode. The shape of the cam groove A is determined so as to secure a predetermined rotation amount of the mode switching motor 40, that is, the cam gear 51 for each. Further, in the cam groove B, the shaft 56 on the chassis 1
A pin 56b provided on a mode switching lever 56 that is rotatable around a is engaged, and a cam gear 51 that rotates a predetermined amount in each mode causes the mode switching lever 56 to take a necessary displacement so that a cam groove B is formed. The shape is set.

The pin 56d provided on the mode switching lever 56 moves counterclockwise around the shaft 56a in FIG. 2 by the rotation of the cam gear 51, but in FIG. 3 and FIG. , Here pin 56
d rotates clockwise, and approaches the convex cam portion 35c formed on the calm arm 35. Where 35c and pin 56
It is assumed that d has a height relationship capable of abutting.

Further, another pin 56e provided on the mode switching lever 56 engages with a cam groove 66c of a lever 66 rotatable about a shaft 66a on the chassis 1, and a pin 66b on the lever 66 is attached to a slider 67. The slider 67 is slidably guided by a pin 67a on the chassis 1 while being loosely fitted and connected thereto. 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 and guided in the elongated hole 67c of the slider 67 and guided by the pin 67a so as to be slidable, and the lock arm 69 is attached rotatably around the pin 70a. A spring 68 is biased between the lock arm 69 and the chassis 1, and the lock arm 69 is constantly biased in the clockwise direction, and the brake operation slider 70 and the lock arm 69 are always biased in the biasing direction of the spring 68, so that the pin 67b. Is positioned by. A pin 71b provided on a Henkan arm 71 rotatable around a shaft 71a on the chassis 1 extends on the slope 70b of the brake operation slider 70 so that the pin 71b can come into contact therewith. In FIG. 1, reference numerals 72 and 73 denote brake arms, which are rotatably provided around shafts 72a and 73a on the chassis, and come into contact with the outer circumferences of the reel stands 2 and 3, respectively, and brake shoes 72b and 73b.
It is provided with arms 72c and 73c capable of contacting the first bose portion 71c. A spring 74 is stretched between the brake arms 72 and 73 to urge them to rotate counterclockwise and clockwise, respectively. On the other hand, in FIG. 2, the shaft 47 is provided with a latch pulley 75 configured as a ready-made one-way clutch by a coil spring, and the claw portion of the latch pulley 75 has a lock arm 69 which is opposite to the biasing direction of the spring 68 from the position of FIG. When it moves in the direction, the latch pulley 75 transmits the rotational force of the shaft 47 in the direction in which the shaft 47 can contact the bent portion 69a and the shaft 47 rotates from the FF / REW mode to the stop mode. It shall be set so that slippage is not transmitted in the direction of rotation to the mode.

Next, a loading mechanism for pulling the tape out of the cassette 115 and an unloading mechanism for accommodating the tape in the cassette 115 will be described with reference to FIGS. Cam gear 5
A gear is formed on the outer circumference of the small diameter portion 51b of the chassis 1.
It meshes with a gear 76 that is rotatable around the upper shaft 76a. A drive arm 77 is rotatably attached to the shaft 76a, and the drive arm 77 has a pin 79 for pivotally connecting an arm 78 and a pin 80 for pivotally connecting a spring pushing arm 81. The spring pushing arm 81 is configured to hold a pushing spring 82 between the spring pushing arm 81 and the drive arm 77 so as to be able to come into contact with the pin 76b that is planted in the gear 76. On the other hand, the arm 78 pulls out the tape,
Tape guides 82, 83 for guiding the tape along a predetermined path
The boss portion 84a of the guide member 84 that is mounted so as to be slidable along the guide groove 85 provided in the chassis 1.
Is pivotally connected to. Similarly, a drive arm 86 is rotatably attached to the shaft 51a.
The arm 88 is pivotally connected by the pin 87, and the spring pressing arm 90 is pivotally connected by the pin 89. The spring pushing arm 90 holds the pushing spring 92 between the driving arm 86 and the spring pushing arm 90 so that the spring pushing arm 90 can come into contact with the pin 51c that is erected on the cam gear 51. Meanwhile, the arm 8
Further, 8 is pivotally connected to an arm 94 by a pin 93, and the arm 94 follows a guide groove 97 provided in the chassis 1 on which tape guides 95 and 96 for pulling out the tape and guiding the tape in a predetermined path are placed. Is slidably attached to the boss 97a of the guide member 97, which is pivotally connected. Further, a pin 99 is provided on the arm 88 and is configured to be guided by a guide groove 100 on the chassis 1.

In FIG. 1, the guide members 84, 97 are tape guides 82, 83, 95, 9 mounted on the tape guides 82, 83, 95, 9 when recording / reproducing, for example.
When the tape in the cassette 115 is pulled out by 6 and is loaded on the fixed tape guide 104, the erasing head 105, the impedance roller 106, the rotary head cylinder 101, the audio control head 107, and the fixed guide 108 on a predetermined path, the tape is fixed on the chassis 1. It is positioned by the stoppers 102 and 103 that are formed.
The tension arm 109 rotatable around the shaft 109a on the chassis 1 has pins 110 set up to form an existing tension servo mechanism including a band brake 111 and a spring 112. 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 the levers 57 and 58 which are rotatable around the shafts 57a and 58a on the chassis 1, respectively, and the groove portion 58b of the lever 58 can drive the pin 59. It is configured. Referring back to FIG. 1, the pin 59 is an arm 60 rotatable about a shaft 60a on the chassis 1 and a pin 62 on a pinch roller arm 62 rotatable about a shaft 62b on the chassis 1.
It is a pin that pivotally connects the link 61 pivotally connected to a to each other.
4 is stretched, and 65 is a stopper of the arm 60 on the chassis 1. A shaft 62c is erected on the pinch roller arm 62 to rotatably support the pinch roller 63.

Next, the operation of the configuration of the present invention described above will be described. When the operation button (not shown) of the FF (REW.) Is pressed in the stop mode shown in FIG.
Rotates in the counterclockwise direction when viewed from the pulley 42 side in FIG. As a result, the driving force of the pulley 42 is transmitted to the pulley 46 via the belt 43, the pulley 44, and the belt 45, so that the shaft 47 integrally fixed thereto rotates with the worm 50 around the bearings 48, 49. Then, the cam gear 51 is rotationally driven around the shaft 51a in the clockwise direction in FIG. At this time, the lever 52 and the mode switching lever 56 are arranged such that the cam grooves A and B of the cam gear 51 and the respective lever pins 52b and 56.
By engaging with b, they rotate counterclockwise, and the slider 67 starts sliding substantially upward by the pin 66b. As a result, the lock arm 69 and the brake slider 70 move while extending the spring 68 integrally with the slider 67 by the pin 67b. This allows
The slope 70b of the brake slider 70 comes into contact with the pin 71b of the hencan arm 71, and the hencan arm 71 moves to the second position.
When a turning force is applied in the counterclockwise direction in the figure and in the clockwise direction in FIG. 1, the 71c part is moved to the arm 72c of the brake arm 72, 73.
73c is contact | abutted, and each arm is each rotated clockwise and counterclockwise. As a result, the brake shoes 72b and 73b of each arm are disconnected from the reel bases 2 and 3, and the braking by the urging 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 brought into contact with the cam portion 35c-, and the cam arm 35 is rotated clockwise to reach the state shown in FIG. Also, the motor 4
Is rotated counterclockwise in FIG. 2 in the FF mode and clockwise in the REW mode, and the belt pulley 19 is rotationally transmitted in each direction via the belt 20, but in FIG. , FF mode, and the belt pulley 19 is rotationally driven in the clockwise direction. Here, the switching lever 33 is displaced clockwise by the rotation of the cam arm 35 via the spring 36 as shown in FIG. 6, and the switching pulley 31 and the C-shaped ring 32 are integrated into the belt pulley 19. Belt pulley 1 because it is pushed down to the side
The rotational force of 9 is transmitted to the drive pulley 10 via the switching pulley 31, and the idler 12 rotates counterclockwise, so that the idler arm 11 swings its head clockwise, and eventually the reel base 3 is rotated clockwise. To do. Thus, the tape fast forward operation in the forward direction is performed.

On the other hand, in the REW mode, the rotational force of the motor 4 is only reversed, and the idler 12 rotationally drives the reel base 2 counterclockwise through the switching pulley 31 and the drive pulley 10 to rotate the rotational force of the belt pulley 19. A tape fast forward operation in the reverse direction is performed. In addition, until this state is reached, the cam gear 51
When is rotated, the lever 52 also continues to rotate counterclockwise,
The mode switch 54 is set to FF via the mode slider 53.
When the contact set to / REW is reached, the energization of the mode switching motor 40 is cut off. The rotation of the cam gear 51 up to the FF / REW mode causes the mode switching lever 56 to rotate.
The levers 57 and 58 interlocking with the elongated hole 56c, the pinch roller arm 62, and the tape loading mechanism portion of FIG. 7 are slightly displaced from the state of FIG. The range is set so that there is no problem.

When the stop operation is performed from the FF / REW mode described above,
The energization of the motor 4 is released, and the mode switching motor 40 is rotationally driven in the reverse direction described above. As a result, the cam gear 51 starts rotating in the counterclockwise direction via the worm 50 in FIG. 2, but at this time, the curved portion 69a of the clock arm 69 is displaced to a position where it can contact the latch pulley 75 via the one-way clutch. Therefore, at the same time as the mode switching motor 40 rotates in the reverse direction, the claw of the latch pulley 75 abuts against the 69a portion to rotate the lock arm 69 counterclockwise against the force of the spring 68. As a result, the lock arm 69 is released from the engagement with the pin 67b and is returned to the lower side integrally with the brake slider 70 by the force of the spring 68,
It returns to the state of FIG. Therefore, the Henkan arm 71
Since the pressing force of the pin 71b is released, the pin 71b rotates counterclockwise in FIG. 1, and the brake arms 72 and 73 respectively return by the force of the spring 74 to brake the reel bases 2 and 3. In this way, the tape high-speed feed at the time of FF / REW is released, and the tape is instantaneously stopped. Further, when the mode switching lever 56 is returned to rotate, the pin 56d is moved from the position shown in FIG.
Since the cam arm 35 is displaced to the figure, the pressing of the cam portion 35c is released, the cam arm 35 is returned by the force of the spring 36, and eventually the switching lever 33 is positioned by the stopper 39, as shown in FIG. On the other hand, the pin 56e is also rotated in the clockwise direction in FIG. 2 to return the arm 66 to move the slider 67 downward,
Eventually, the pin 67b locks the lock arm 69 by the rotational biasing force of the spring 68. At this time, lever 5
2 also rotates and returns by the rotation of the cam gear 51, and the mode switch 54 also returns to the contact set in the stop mode, so that the rotation of the mode switching motor 40 also stops.

Next, the operation when the recording / reproducing operation button (not shown) is pressed will be described. Here, the contact position of the mode switch 54 in the recording / reproducing mode is further ahead of that in the FF / REW mode, and the rotation amount of the mode switching motor 40 is further obtained. In other words, when the record / playback operation button is pressed, first of all, as in the above-mentioned FF / REW, the reel stand 2/3
The braking is released. However, at this time, the rotational drive of the motor 4 is not yet performed, and when the mode switching motor 40 further rotates, the rotational drive of the cam gear 51 and the gear 76 meshing with the cam gear 51 causes the pin 51 of FIG.
The c and 76b push the spring pushing arms 90 and 81, and further drive the driving arms 86 and 77 in the counterclockwise clockwise direction via the pushing springs 92 and 92 '. As a result, the guide member 97 is driven via the arms 88 and 94, and the tape guides 95 and 96 pull out the tape in the cassette 115. Similarly, the guide member 84 is driven via the arm 78, and the tape guide pins 82 and 83 pull out the tape in the cassette 115.

When the rotation of the mode switching motor 40 further progresses, the guide members 97 and 84 continue to move along the guide grooves 98 and 85 on the chassis 1 and eventually come into contact with the stoppers 103 and 102 to perform predetermined positioning, and the tape guide 95. , 96, 8
2, 83 form a predetermined tape running path. At this time, the pushing springs 92, 92 'are deflected by a predetermined amount to exert a pressure-bonding force on the stoppers 103, 102, so that the guide members 97,
The posture of 84 is held. On the other hand, when the pin 56d of the mode switching lever 56 is near the FF / REW mode on the way,
As shown in FIG. 6, the transmission path of the switching pulley 31 is switched. However, as the mode switching lever 56 further rotates, the pin 56d is disconnected from the cam portion 35c- of the cam arm 35, and the cam arm 35 springs. The state of FIG. 3 is restored by the urging force of 36, and the transmission path of the switching pulley 31 also becomes the state of FIG.

After that, since the rotation of the motor 4 is switched to be started, the rotational force transmitted to the belt pulley 19 is transmitted to the matrix pulley 22 by the belt 23, and the felts 25 and 26, the pressure plate 27, and the spring 2 are transmitted.
8 and a predetermined rotation via a friction mechanism including a stopper 29 are transmitted from the gear wheel gear 24 to the switching pulley 31 via the idler gear 30 to rotationally drive the drive pulley 10. At this time, as in the FF / REW, the idler 12 rolls and drives either of the reel bases 2 and 3 depending on the rotation direction of the motor 4. The flywheel 7 is simultaneously driven by the belt 8 by the rotation of the motor 4. However, here, the reel base drive of the idler 12 regulates the movement of the idler arm 11 by operating an inhibit mechanism (not shown) in order to match the timing with the start of tape drive by the capstan 6 and the pinch roller 63 described later. .

On the other hand, the lever 57 fitted and connected in the elongated hole 56c of the mode switching lever 56 and the lever 58 interlocked with this pushes the pin 59 to the right in FIG.
Gradually rotate 2 counterclockwise. Guide members 97, 8
By the time 4 reaches the stoppers 103, 102, the pinch roller 63 contacts the capstan 6 by sandwiching the pulled-out tape, and when the pin 59 is further pressed, the arm 6
Starts to rotate clockwise against the force of the spring 64, and as a result, the pinch roller 63 presses the tape on the capstan 6 by the force of the spring 64 and starts driving at a constant speed. At the same time, the inhibit of the idler arm 11 is released, and the drive of the reel stand 2 or 3 is also started. At this time, when the motor 4 rotates clockwise in FIG. 1, both the capstan 6 and the reel stand 3 are given clockwise rotation, the tape runs forward, and when the motor 4 rotates counterclockwise, Both the capstan 6 and the reel stand 2 are rotated in the counterclockwise direction, and the vehicle travels in reverse.

When the cam gear 51 rotates until the pinch roller 63 reaches the pressure contact state, the lever 52 also continues to rotate counterclockwise in FIG.
Reaches the contact set for recording / reproduction, and the energization of the mode switching motor 40 is cut off to stop. Here, the rotational force of the mode switching motor 40 is the worm 50 and the cam gear 51.
Since it is via a speed reduction mechanism by means of, the pinch roller 63 is pressed and the guide members 97, 84 are stopped by the stoppers 103, 102.
The state of being crimped to is sufficiently maintained even after the mode switching motor 40 is stopped.

Next, the operation of performing the stop operation from recording / reproducing will be described. When the stop button (not shown) is pressed, the mode switching motor 40 starts to rotate in the opposite direction to when the tape is loaded, and the motor 4 starts to rotate in the same direction as when the tape is running in reverse. As a result, the cam gear 51 rotates counterclockwise in FIG. 2, so that the mode switching lever 56 rotates clockwise, and first,
The pressure contact of the pinch roller 63 is released. Further, in FIG. 1, the cam gear 51 rotates in the clockwise direction and the gear 76 rotates in the counterclockwise direction, thereby releasing the pressure contact with the guide members 97, 84 stoppers 103, 102 and starting the retreat. At the same time, the rotation of the motor 4 drives the reel base 2 in the counterclockwise direction through the transmission path via the slip mechanism shown in FIG. 4, and the tape guides 95, 96, 82, 83 are retracted to prevent the excess tape from sagging. As shown in FIG. In this way, when the unloading operation is advanced, the pin 56d eventually comes to the cam portion 35c of the cam arm 35.
The cam arm 35 is rotated in the counterclockwise direction in FIG. However, this displacement is caused by the rib 3
5a part bends one arm of the spring 36 a little,
When the pin 56d is no longer in contact with the cam portion 35c-, the force of the spring 36 returns to the position shown in FIG.
Further, in this process, since the switching arm 33 does not change the posture shown in FIG. 4, the transmission path is entirely through the slip mechanism and the tape is slackened.

When the mode switching lever 56 reaches the vicinity of the FF / REW mode, the brake arms 72 and 73 are actuated by the release of the lock arm 69 of the latch pulley 75, just as at the time of the stop operation from the FF / REW, and the reel base 2・ 3 has braking. Further, when the pinch roller arm 62 and the guide members 97 and 84 also return to the state shown in FIG. 1, the mode switch 54 reaches the contact in the stop mode, and the motors 4 and 40 are deenergized and stopped. Further, although not described here, high-speed reproduction in the forward and purse directions can be similarly performed using this device.

As described above in detail, the present invention is rotatable about the shaft (9) arranged between the first motor (4) capable of rotating in the forward and reverse directions and the pair of reel stands (2, 3). Drive pulley (1
0), and a swing idler device (11, 12 ,,) that includes an idler (12) that is rotationally coupled to the drive pulley and that drives one of the pair of reel stands to rotate in accordance with the rotation direction of the drive pulley. 17, 18) and a first transmission path (20, 19, 31, 10) for transmitting the rotation of the first motor to one of the reel bases with a strong torque via the drive pulley and the swing idler device. , 1
2), the rotation of the first motor is controlled by the drive pulley, the swing idler device, and the slip mechanism (25 to 29).
The second torque that is transmitted to one of the reel bases with a weak torque via
Transmission path (20, 19, 23, 22, 24 to 31, 1
0, 12), a second motor (40) capable of rotating in the forward and reverse directions and configured to rotate by a predetermined amount in accordance with the switching between the fast forward / rewind operation mode and the recording / reproducing operation mode, and the second motor. A cam gear (5 driven by rotation
1) and a transmission that is driven in association with the rotation of the cam gear to select the first transmission path in the fast-forward / rewind operation mode and select the second transmission path in the recording / reproduction operation mode. The magnetic tape is driven by the rotation of the path selecting means (32 to 38) and the cam gear, and the magnetic tape is pulled out from the cassette by the pulling member (82, 83, 95, 96) in the recording / reproducing operation mode. A loading means (76 to 100) for performing a loading operation for loading on a traveling path, and a magnetic tape pulled out from the cassette in the recording / reproducing operation mode in a capstan (6) driven in association with rotation of the cam gear. And a pinch roller moving means (56 to 64) having a pinch roller (63) for pressure bonding.

According to the present invention, the tape drive corresponding to each operation mode can be dealt with by the two motors of the tape drive motor and the mode switching motor, and it is possible to provide an inexpensive and remote control device. Further, since it does not use an electromagnet, it consumes less power and is suitable for a portable type magnetic recording / reproducing apparatus driven by a battery.

In particular, according to the present invention, a cam gear driven by the rotation of the second motor is provided, and in response to the rotation of the cam gear, not only the transmission path selecting means for driving the reel base, the loading means for loading, but also the pinch roller movement. Since the means are also driven, it is possible to obtain higher reliability in mutual operation and to arrange a more concentrated operation system, so that a more compact and cheaper device can be obtained.

[Brief description of drawings]

FIG. 1 is a plan view showing a VTR mechanism to which an embodiment according to the present invention is applied, FIG. 2 is a rear view of FIG. 1, and FIG. 3 is a plan view showing details of a reel drive section for forward recording (reproduction). FIG. 4 is a side view of FIG. 3 showing the mode, and FF / REW is shown in FIG.
Other than the modes, FIG. 5 is a plan view showing the details of the reel driving section showing the FF mode, FIG. 6 is a side view of FIG. 5 showing the FF / REW mode, and FIG. FIG. 8 is a detailed view of the torque transmission path switching mechanism element, FIG. 8 is a detailed view of the tape loading / unloading mechanism showing a recording (reproducing) mode, and FIG. 9 is a side view of FIG. 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 to 46: deceleration mechanism, 56: mode change lever, 82, 83, 95, 96: magnetic tape pull-out member, 84, 97: guide member, 76: gear, 54: mode change switch .

Claims (1)

[Claims] 1. A first motor capable of rotating in the forward and reverse directions, a drive pulley rotatable about an axis arranged between a pair of reel stands, and a rotation coupling of the drive pulley and a rotation of the drive pulley. A swinging idler device having an idler configured to rotate one of the pair of reel stands according to a direction, and rotation of the first motor with a strong torque via the drive pulley and the swinging idler device. A first transmission path for transmitting to one of the reel bases;
Second transmission path for transmitting the rotation of the motor to one of the reel bases with a weak torque through the drive pulley, the swing idler device, and a slip mechanism, a fast forward / rewind operation mode, and a recording / reproduction operation mode. A second motor capable of rotating in the forward and reverse directions, each of which is configured to rotate by a predetermined amount in accordance with the switching of the cam, a cam gear driven by the rotation of the second motor, and a fast feed / drive driven in association with the rotation of the cam gear. Transmission path selecting means for selecting the first transmission path in the rewinding operation mode and selecting the second transmission path in the recording / reproducing operation mode, and the recording operation driven in association with the rotation of the cam gear. / When in the reproduction operation mode, the magnetic tape is pulled out from the cassette by the pull-out member and loaded into the predetermined tape running path. And a pinch roller moving means having a pinch roller that is driven in association with rotation of the cam gear and presses the magnetic tape pulled out from the cassette onto the capstan in the recording / reproducing operation mode. Magnetic recording / reproducing device.