JPH0614291Y2 - Breaking device in magnetic recording / reproducing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a brake device for applying a braking force to a reel stand of a magnetic recording / reproducing device such as a VTR (video tape recorder).

(Prior Art and Problems Thereof) A conventional braking device in a magnetic recording / reproducing apparatus includes a supply side reel base and a winding side from the end of the fast forward or rewind mode to the start of the reproduction or recording mode. Since it is not configured to apply a braking force to the reel base, there is a possibility that the tape may loosen during that time. Also,
Since a drive source such as a solenoid dedicated to the brake device is required, the structure is complicated, which is an obstacle to reduction in size and weight and cost reduction.

The present invention has been made in view of the above circumstances, and the tape is not loosened between the end of the fast-forward or rewind mode and the start of the playback or recording mode. An object of the present invention is to provide a brake device for a magnetic recording / reproducing device that does not require a drive source.

(Means for Solving the Problems) In order to solve the above-mentioned problems, the brake device of the magnetic recording / reproducing apparatus of the present invention is normally rotated by the operation of the reproducing mode setting operation body or the recording mode setting operation body. A fast-forward mode setting operation body or a rewinding mode setting operation body is operated to rotate in the opposite direction to execute the specified mode, and a cam motor that can reciprocate and moves in one direction by the spring biasing force. A first movable member that interposes a gear in the rotation transmission path from the capstan motor to the reel base and moves the low-speed side gear to the outside of the rotation transmission path when moving in the other direction, and a reciprocating movable spring urging force. A second movable member for moving the high speed side gear out of the rotation transmission path when moving in one direction and interposing the high speed side gear in the rotation transmission path when moving in the other direction; When the movable member moves in the other direction, the first movable member and the second movable member move in the other direction so that the movable member and the second movable member are connected to each other. A braking table is provided to the take-up reel stand until the normal rotation mode is started, and when the second movable member moves in the other direction, the second movable member is actuated to control the take-up reel stand. A braking force is applied to the supply side reel base during the period from the end of the reverse rotation mode of the cam motor to the start of the normal rotation mode of the winding side braking member for releasing the application of power, and the above-mentioned respective modes are set. In the setting process and in association with the operation of the winding-side braking member to release the application of the braking force, the supply-side braking member that releases the application of the braking force to the supply-side reel base and the normal rotation of the cam motor. Formed by and a releasing mechanism for releasing the coupling of the first and second movable member by the coupling mechanism is actuated by the rotation force of the cam motor.

(Operation) When the fast forward or rewind mode is completed and the operation for switching to another playback or recording mode is performed, the braking force is applied to both reel stands until the playback or recording mode is started. It Further, the braking member is operated in association with the operation of the movable member involved in the switching operation of the rotation speed switching mechanism.

(Embodiment) An embodiment of the present invention will be described below with reference to the accompanying drawings.
FIG. 1 is a plan view of a magnetic recording / reproducing apparatus equipped with a brake device of the present invention, and FIG. 2 is a bottom view of the same. Reference numeral 1 in both figures is a magnetic recording / reproducing apparatus, and a cam motor 3, a capstan motor 4, and a guide cylinder motor 5 are attached to a chassis 2 thereof.

The cam motor 3 rotates normally in the reproduction mode or the recording mode and reversely rotates in the fast-forward or rewind mode. The rotational force of the cam motor 3 is transmitted via the first power transmission mechanism 6.
Be transmitted to.

The first power transmission mechanism 6 is provided on the lower surface (rear surface) of the chassis 2 as shown in FIG. 2, and has a small diameter first V-groove fixed to the rotary shaft 3a of the cam motor 3.
The pulley 8 is composed of a large-diameter second pulley 9 with a V groove rotatably attached to the lower surface of the chassis 2, and rubber or the like wound between the first and second pulleys 8 and 9. An endless belt 10 formed of a square belt having a square cross section, a small-diameter first gear 11 integrally and concentrically provided in the center of the upper surface of the second pulley 9, and a mesh with the first gear 11 and the chassis. The second gear 12 includes a large-diameter second gear 12 rotatably attached to the lower surface of the second gear 12, and a small-diameter third gear 13 concentrically and integrally provided at the center of the upper surface of the second gear 12.

As shown in FIG. 2, the cam plate 7 is axially attached to the lower surface of the chassis 2 so as to be rotatable in the forward and reverse directions. The cam plate 7 is integrally provided with a gear 14 on an outer peripheral edge portion thereof, and has a first cam portion 15 on an upper surface (front surface) thereof as shown in FIG.
Further, as shown in FIG. 4, the lower surface (rear surface) thereof has second and third cam portions 16 and 17, and the gear 14 meshes with the third gear 13 of the first power transmission mechanism 6. There is.

The rotational position of the cam plate 7 is electrically detected by a detection unit (not shown), and a control unit (not shown) sets the cam plate 7 to a mode setting unit (not shown) based on the detected position information. It is controlled to a position corresponding to various modes (stop, recording, reproduction, fast forward, rewind, pause, review, etc.) set by (not shown).

The rotational force of the cam motor 3 causes the first power transmission mechanism 6 to rotate.
Further, the driving force is transmitted to all of the rotational speed switching mechanism 18, the brake mechanism 19 and other mechanisms described later through the cam plate 7.

The rotational force of the capstan motor 4 is supplied to the capstan 21 via the second power transmission mechanism 20 and via the third power transmission mechanism 22 and the rotation speed switching mechanism 18, as shown in FIG. And the reel side 24 of the take-up side. These both reel stands 2
3, 24 are rotatably mounted on the upper surface of the chassis 2 with a space therebetween. These reel stands 23,24
Has reel shafts 23a and 24a in the central portion and gears 23b and 24b in the outer peripheral surface of the lower end, respectively.

The second power transmission mechanism 20 is provided on the lower surface of the chassis 2, and has a small diameter first pulley 25 fixed to the rotation shaft 4 a of the capstan motor 4 and a lower end of the capstan 21. It is composed of a large-diameter second pulley (flywheel) 26 fixed integrally rotatably, and an endless belt 27 wound between these pulleys 25, 26. The capstan 21 is rotatably planted on the upper surface of the chassis 2, and a pinch roller 28 contacts and separates from the capstan 21.

The third power transmission mechanism 22 is a small-diameter first pulley 2 that is fixed to the rotation shaft 4a of the capstan motor 4 below the first pulley 25 of the second power transmission mechanism 20.
9 and the supply side reel stand 23 on the upper surface of the chassis 2.
A large-diameter second pulley 32 rotatably fitted to a shaft 31 having an upper end fixed to a sub-chassis 30 mounted between the reel side 24 and the take-up reel stand 24, and these pulleys 2
It is composed of an endless belt 33 wound between 9 and 32, and a small-diameter gear 34 provided concentrically and integrally with the central portion of the upper surface of the second pulley 32.

The rotation speed switching mechanism 18 includes the supply side reel stand 23.
And the rotation speed of the take-up reel stand 24 are switched by changing the gear ratio. As shown in FIGS. 1 and 2, and FIGS. 5 to 9, a gear mechanism 35 and a link mechanism 36 are provided. is doing.

The gear mechanism 35 is rotatably fitted to the shaft 31 and a first gear 37 rotatably fitted to the shaft 31, a second gear 38 integrally provided on the lower surface of the first gear 37, and the shaft 31. A third gear (clutch gear) 39, a rotating plate 40 fitted to the shaft 31 so as to be rotatable forward and backward, and a fourth plate rotatably mounted on both sides of the rotating plate 40. , Fifth gear 41, 42
And the first and second rotating levers 43 and 44, and the first and second
Sixth (low speed side) and seventh (high speed side) gears 45 and 46 rotatably attached to one ends of the second turning levers 43 and 44,
The eighth and ninth gears 47 and 48 are integrally provided on the upper surfaces of the sixth and seventh gears 45 and 46. The first,
The second rotating levers 43, 44 are pivotally attached to the upper surface of the chassis 2 and the lower surface of the sub-chassis 30 so that the intermediate portions thereof can rotate in the forward and reverse directions. When the second pulley 32 of the third power transmission mechanism 22 rotates counterclockwise in FIG. 2, the rotating plate 40 also rotates counterclockwise in FIG. 2, and the fourth gear 41 supplies the supply. The fifth gear 42 does not mesh with the gear 23b of the side reel base 23 and meshes with the gear 24b of the winding side reel base 24. Also, the second pulley 3
When 2 rotates clockwise in FIG. 2, the rotating plate 40 also rotates clockwise in FIG. 2, the fourth gear 41 meshes with the gear 23b of the supply reel stand 23, and the fifth gear The gear 42 does not mesh with the gear 24b of the take-up reel stand 24. The first and second turning levers 43 and 44 are the shafts 43a,
When rotated counterclockwise in FIG. 1 about 44a, the sixth and eighth gears 45 and 47 do not mesh with any gears, and the seventh gear 46 causes the second gear of the third power transmission mechanism 22 to move. While meshing with the gear 34 of the pulley 32, the ninth gear 48 meshes with the second gear 38, and a high-speed rotation transmission state is established as shown in FIG. When the first and second rotating levers 43, 44 rotate clockwise in FIG. 1, the sixth gear 45 meshes with the gear 34 of the second pulley 32 of the third power transmission mechanism 22. At the same time, the eighth gear 47 meshes with the third gear 39, and the seventh and ninth gears 46 and 48 do not mesh with any of the gears to form a low-speed rotation transmitting member as shown in FIG. The diameter of the eighth gear 47 is set smaller than the diameter of the ninth gear 48, and the diameter of the second gear 38 is set smaller than the diameter of the third gear 39.

The link mechanism 36 includes a first movable member 49 mounted on the upper surface of the chassis 2 slidably within a predetermined range, and a second movable member 50 mounted on the upper surface of the first movable member 49 slidably within a predetermined range. A substantially intermediate portion is composed of a rotation lever 51 which is pivotally mounted on the lower surface of the chassis 2 so as to be rotatable in a predetermined angle range in the forward and reverse directions. The first and second movable members 49, 50
Of the engaging protrusions 49a and 50a provided on the upper surface of one end of the first and second rotating levers 43 and 44, respectively.
b and 44b are rotatably engaged. Then, the first and second movable members 49 and 50 slide to the right in FIG. 1 to cause the first and second rotating levers 43 and 4 to slide.
4 rotates counterclockwise in the figure to enter a high-speed rotation transmission state. Further, the first and second movable members 49 and 50 slide to the left in FIG. 1 to rotate the first and second rotation levers 43 and 44 clockwise in FIG. 1 to transmit low-speed rotation. It becomes a state. The first and second movable members 49, 50 are urged by coil springs 52, 53 in the direction of low speed rotation transmission (leftward in FIG. 1). The second movable member 50 has a first engaging protrusion 50b at one side edge thereof that abuts on the stopper 2a on the upper surface of the chassis 2 so that
The movement limit position to the left in the figure is restricted. Engaging pin 49b projecting from the lower surface of the other end of the first movable member 49
Is movably projected through the hole 2b provided in the chassis 2 to the lower surface side of the chassis 2 and is rotatably engaged with the engaging hole 51a of the rotary lever 51. The rotation lever
An engagement pin 51b at one end of the 51 is slidably engaged with the second cam portion 16 of the cam plate 7. Then, as the cam plate 7 rotates in the clockwise direction in FIG. 2 by a predetermined angle, the first movable member 49 is moved through the rotation lever 51.
Is transmitted by the biasing force of the coil spring 52 in the low speed rotation transmission direction (first
Move to the left in the figure).

A connecting mechanism 54 is provided on the other end side upper surface of the first movable member 49. As shown in FIG. 1, the connecting mechanism 54 has a rotating lever 55 having a substantially middle portion axially mounted on the upper surface of the first movable member 49 so as to be rotatable forward and backward in a predetermined range. An engaging projection 55a is provided on a lower surface of one end side of the rotating lever 55 so as to be engageable with and disengageable from an engaging step portion 49c provided on the other end side of the first movable member 49. Engage.
When the engagement protrusion 55a engages with the engagement step 49c, the first and second movable members 49 and 50 are connected to each other and integrally slide in the other direction. The rotating lever 55 is biased in the engaging direction by a spring 56. The first and second movable members 4 by the connecting mechanism 54.
The connected state of 9, 50 is when the cam motor 3 is rotating forward, and the first and second movable members 49, 50 are in the first position.
When it reaches the rightward movement limit position in the figure, it is released by the release mechanism 57.

The release mechanism 57 has a rotating body 58 which is axially attached to the upper surface of the chassis 2 so as to be rotatable in the forward and reverse directions. The rotating body 58
A plurality of engaging teeth 58a are provided on the upper surface of the so as to be evenly arranged in the circumferential direction. A gear 59 is provided on the rotating body 58 so as to be coaxially rotatable therewith, and the gear 59 meshes with the second gear 12 of the first power transmission mechanism 6. When the cam motor 3 is normally rotating, the rotating body 58 rotates counterclockwise in FIG. 1, and the engaging tooth 58a thereof allows the rotating lever 55 to be rotatably attached to the upper surface thereof. The rotation lever 55 is rotated in the releasing direction (clockwise in FIG. 1) against the urging force of the spring 56, and the engagement protrusion 55a is pushed. The first rotating member 49 is disengaged from the engaging step portion 49c to be in the connection release state. When the cam motor 3 rotates in the reverse direction, the rotating body 58
Rotates in the clockwise direction in FIG. 1, and the engagement teeth 58a thereof only make sliding contact with the contact member 60, and the rotation lever 55 is not rotated in the release direction and maintains the connected state.

The brake mechanism 19 applies a braking force to the supply reel stand 23 and the take-up reel stand 24. As shown in FIG. 1, the brake mechanism 19 has a supply side braking member 61 and a winding side braking member 62. The both braking members 61, 62 have rubbers at one end of arms 63, 64 whose substantially middle portions are pivotally mounted on the upper surface of the chassis 2 and the lower surface of the sub-chassis 30 so as to be rotatable forward and backward in a predetermined angle range. Brake shoes 65 and 66 made of the same material are provided.

The arm 63 of the supply side braking member 61 has first and second engaging portions 63a and 63b at the other ends, respectively.
The arm 64 of the winding side braking member 62 has a first engaging portion 64a on the lower surface of one end thereof and second and third engaging portions 64b, 64c at the other end thereof.

The frame shoes 65, 66 of the both braking members 61, 62 come into contact with and separate from the peripheral side surfaces of the reel stands 23, 24, and at the time of contact, a braking force is applied to the reel stands 23, 24. When the winding-side braking member 61 rotates from the braking state to the non-braking direction (counterclockwise direction in FIG. 1), the second engaging portion of the arm 64.
64b abuts and engages with the second engaging portion 63b of the arm 63 of the supply side braking member 61 to rotate the supply side braking member 61 in the braking state in the non-braking direction. Both the braking members 61,
The coil spring 62 is urged to rotate in the braking direction by coil springs 67 and 68. These coil springs 67 and 68 have one end fixed to the arms 63 and 64 of the braking members 61 and 62 and the other end fixed to the upper surface of the chassis 2. The first engaging portion 63a of the arm 63 of the supply side braking member 61
Is slidably engaged with an engagement hole 72 of a slide lever 71 of a link mechanism 70 of a tape loading mechanism 69 via a hole 2c formed in the chassis 2 so as to be movable. As shown in FIG. 2, the engagement hole 72 is formed in the long axis narrow portion 7
2a and a short-axis wide portion 72c that is continuously provided at one end thereof via an inclined surface 72b. When the first engaging portion 63a of the arm 63 of the supply side braking member 61 is located in the narrow portion 72a of the engaging hole 72, the supply side braking member 61 is provided.
Is in a non-braking state. Further, the supply side braking member 6
When the first engaging portion 63a of the first arm 63 is located in the wide portion 72c of the engaging hole 72, the supply side braking member 61 is in the braking state. The first engaging portion 64a of the arm 64 of the winding side braking member 62 extends to the lower surface side of the chassis 2 through a hole (not shown) of the chassis 2, and the tape is attached to the extending end portion. When one side surface of the rotation lever 73 of the link mechanism 70 of the loading mechanism 69 comes into contact with and separates from the other side,
The turning lever 73 pushes and turns the winding-side braking member 62 in the non-braking direction. The rotation lever 73 is rotatably attached to the lower surface of the chassis 2 by a predetermined angle, and the engagement pin 73a is slidably engaged with the second cam portion 17 of the cam plate 7. Arm 64 of the winding side braking member 62
The third engaging portion 64c of the third engaging protrusion 64c on the upper surface of the second movable member 50 of the link mechanism 36 of the rotation speed switching mechanism 18 is provided.
0c engages and disengages with 0c. Then, as the rotation speed switching mechanism 18 switches to the high-speed rotation state, the winding-side braking member 62 enters the non-braking state.

The tape loading mechanism 69 pulls out the magnetic tape from the cassette (not shown) at the apparatus position, which is loaded by the cassette loading mechanism (not shown), and extends over the outer peripheral surface of the guide cylinder 74 within a predetermined angle range. It is to be inscribed.

Next, the operation of the brake device in the magnetic recording / reproducing apparatus having the above configuration will be described.

(I) In the cassette unloading state, the cam plate 7 is in the cassette unloading mode position as shown in FIG.

The tape loading mechanism 69 is in the unloading state as shown in FIG. 1, and the slide lever 71 of the link mechanism 69 is in the position shown in FIG.

In the rotation speed switching mechanism 18, the first movable member 49 of the link mechanism 36 resists the biasing force of the coil spring 52 to the right side in FIG. The third power transmission mechanism 22 is in a state of moving to the middle left side, that is, in a state where the coupling mechanism 54 is released.
The rotational force of the second pulley 32 is not transmitted to the first gear 37 and is in a neutral state.

The brake mechanism 19 is in a brake operating state in which a braking force is applied to both reel stands 23, 24 as shown in FIGS. 1 and 10 (A).

(II) From this state, when the cassette is inserted into the cassette housing to a predetermined set position, the detection is detected by a detection switch (not shown), and the capstan motor 4 moves in one direction (clock in FIG. 2) based on the detection signal. Direction), the cassette loading mechanism is driven, and the cassette is loaded to the mounting position.

When the cassette loading is completed, this is detected by a detection switch (not shown), the rotational drive of the capstan motor 4 is stopped based on the detection signal, and the drive of the cassette loading mechanism is stopped.

When the rotational drive of the capstan motor 4 is stopped, the detection switch detects this, and the cam motor 3 is rotationally driven in the forward direction (clockwise direction in FIG. 2) based on the detection signal,
The rotational force is transmitted to the cam plate 7 through the first power transmission mechanism 6, the cam plate 7 rotates in the forward direction (clockwise direction in FIG. 2), and the rotation speed switching mechanism 18 rotates with the rotation. By engaging the engagement pin 51b of the moving lever 51 with the large diameter portion 16a of the second cam portion 16 of the cam plate 7 from the small diameter portion 16b,
The rotation speed switching mechanism 18 is switched to the low speed rotation transmission state as shown in FIG. Then, the rotational drive of the cam motor 3 is stopped, and the cam motor 3 enters a standby state.

That is, by engaging the engagement pin 51b of the rotation lever 51 of the rotation speed switching mechanism 18 with the small diameter portion 16b of the second cam portion 16 of the cam plate 7, the rotation lever 51 moves counterclockwise in FIG. Direction, and only the first movable member 49 connected to the turning lever 51 moves to the left side in FIG. 1 by the urging force of the coil spring 52, and a low speed rotation transmission state is obtained as shown in FIG. Switch.

As the first movable member 49 moves to the left side in FIG. 1, the connecting mechanism 54 enters the connected state.

(III) When the reproducing or recording mode setting operation body of the mode setting section is operated from such a standby state, the cam motor 3 moves in the forward direction and the capstan motor 4 moves in the reverse direction (opposite in FIG. 2) based on the operation signal. (Clockwise) and the cylinder motor 5 are rotationally driven in one direction, respectively, and the cam plate 7, the capstan 21, and the guide cylinder 74 are rotated.

The cam plate 7 as the cam motor 3 rotates in the forward direction
By the normal rotation, the engaging pin 73a of the rotating lever 73 of the link mechanism 70 of the tape loading mechanism 69 engages from the small diameter portion 17b of the second cam portion 17 of the cam plate 7 to the large diameter portion 17a side. , The rotation lever 73 is rotated counterclockwise in FIG. 2, and the slide lever 71 connected to the rotation lever 73 is moved to the second position.
When the first engaging portion 63a of the arm 63 of the supply side braking member 61 of the brake mechanism 19 comes into contact with the narrow portion 72a through the inclined surface 72b of the engaging hole 72, the first engaging portion 63a is moved to the right side in the drawing. The arm 63 is rotated clockwise in FIG. 1 against the urging force of the coil spring 67, and the braking on the supply reel stand 23 is released as shown in FIG. 10 (B).

Further, the link mechanism 7 of the tape loading mechanism 69.
By moving the slide lever 71 of 0 to the right side in FIG. 2, both loading arms (not shown) of the tape loading mechanism 69 are actuated to the loading side, the magnetic tape in the cassette is pulled out, and the outer circumference of the guide cylinder 74 is pulled out. Will be inscribed on.

In addition, the ring mechanism 7 of the tape loading mechanism 69.
As the second rotation lever 73 of 0 rotates in the counterclockwise direction in FIG. 2, one side surface of the rotation lever 73 causes the first engagement of the arm 64 of the winding side braking member 62 of the brake mechanism 19. Joint part 6
By contacting 4a, the arm 64 is rotated counterclockwise in FIG. 1 against the biasing force of the coil spring 67,
As shown in FIG. 10 (C), the braking on the take-up reel stand 24 is released. Then, when the tape loading is completed, the reproduction or recording mode is executed.

With the execution of the reproduction or recording mode, the cam motor 3
The rotation drive of is stopped.

(IV) When the fast-forward mode or rewind mode setting operation body of the mode setting section is operated from the reproduction or recording mode, the cam motor 3 rotates in the reverse direction (counterclockwise direction in FIG. 2) based on the operation signal. The cam plate 7 is driven to move from the reproduction mode position to the fast forward or rewind mode position, that is, the engagement pin 5 of the rotation lever 51 of the rotation speed switching mechanism 18.
It is rotated in the opposite direction (counterclockwise in FIG. 2) until 1b engages with the large diameter portion 16a of the second cam portion 16.
With the reverse rotation of the cam plate 7, the rotary lever 73 of the link mechanism 70 of the tape loading mechanism 69 reversely operates, and the arm 64 of the winding side braking member 62 of the brake mechanism 19 is urged by the coil spring 68. By being rotated, a braking force is applied to the take-up reel stand 24.

Further, with the reverse rotation of the cam plate 7, the tape loading mechanism 69 reversely operates, and the loading arm returns to the initial position.

The reverse operation of the tape loading mechanism 69 causes the first arm 63 of the supply side braking member 61 of the brake mechanism 19 to move to the first position.
Since the engaging portion 63a does not come into contact with the inclined surface 72b of the engaging hole 72 of the slide lever 71, the arm 63 is rotated by the urging force of the coil spring 67 and a braking force is applied to the supply reel stand 23. To be done.

With the reverse rotation of the cam plate 7, the engagement pin 51b of the rotation lever 51 of the link mechanism 36 of the rotation speed switching mechanism 18 becomes
From the small diameter portion 16b of the second cam portion 16 of the cam plate 7 to the large diameter portion 1
By engaging with 6a, the first movable member 49 moves to the right in FIG. 1 against the biasing force of the coil spring 52, together with the second movable member 50 in the state of being connected by the connecting mechanism 54. .

With the movement of the first and second movable members 49, 50, the winding side braking member 6 is attached to the third engaging protrusion 50c of the second movable member 50.
When the third engaging portion 64c of the second arm 64 comes into contact with the second arm 64, the arm 64 is rotated counterclockwise in FIG. Braking is released.

Further, as the arm 64 rotates in the braking release direction, the second engaging portion 64b of the arm 64 causes the supply side braking member 6 to move.
By contacting the second engaging portion 63b of the first arm 63, the arm 63 is rotated in the clockwise direction in FIG. 1 against the biasing force of the coil spring 67, and the braking on the supply-side reel stand 23 is released. (See FIGS. 11A and 11B).

Further, as the first and second movable members 61 and 62 move to the right in FIG. 1, the rotation speed switching mechanism 18 moves to the fifth position.
As shown in the figure, the state is switched to the high-speed rotation transmission state, the magnetic tape is run at high speed, and the fast-forward or rewind mode is executed.

As the first and second movable members 61, 62 move to the right in FIG. 1, the engaging teeth 58a of the rotating body 58 of the release mechanism 57 slides on the contact member 60. The cam motor 3 is rotated in the forward direction, and the rotating body 58 is rotated in the clockwise direction in FIG. 1 accordingly, so that the connecting mechanism 54 is not released as shown in FIG. 12 (A). Both movable members 61 and 62 are kept connected to each other.

(V) When the reproduction or recording mode setting operation body of the mode setting section is operated from the fast forward or rewind mode,
Based on the operation signal, the cam motor 3 is rotated in the forward direction from the fast-forward mode or rewind mode position to the reproduction or recording mode position.

As the cam plate 7 rotates in the positive direction, the rotating body 58 of the release mechanism 57 rotates counterclockwise in FIG.
The engaging tooth 58a comes into contact with the abutting member 60 and presses the abutting member 60, whereby as shown in FIG.
4 is released.

When the connecting mechanism 54 is released, only the second movable member 62 slides to the left side in FIG. 1 by the biasing force of the coil spring 53, and the winding side braking member 62 is rotated by the biasing force of the coil spring 68 to reproduce. Alternatively, until the recording mode is started, the braking force is applied to the take-up reel base 24, and the supply side braking member 23 is also rotated by the urging force of the coil spring 67, so that the reproduction or recording mode is set. Until the start, the braking force is also applied to the supply reel stand 23.

When the cam plate 7 is rotated to the reproduction or recording mode position, each of the other mechanisms is set in the reproduction or recording mode to perform the reproduction or recording mode as in the above (III).

(Advantages of the Invention) As described above, the brake device of the magnetic recording / reproducing apparatus of the present invention is normally rotated by the operation of the reproduction mode setting operation body or the recording mode setting operation body, and the fast-forward mode setting operation body or the rewind mode. A cam motor that rotates in the reverse direction by the operation of the setting operation body to execute the set predetermined mode, and a low-speed gear from the capstan motor to the reel stand that can reciprocate and moves in one direction by the biasing force of the spring. A first movable member that is interposed in the rotation transmission path and moves the low speed side gear to the outside of the rotation transmission path when moving in the other direction; and a high speed side gear that can reciprocate and moves in one direction by the biasing force of a spring. A second movable member for moving the high speed side gear in the rotation transmission path when the second movable member moves outside the rotation transmission path and in the other direction, and the first movable member when the first movable member moves in the other direction. A connecting mechanism for connecting the movable members to each other so that the second movable member moves in the other direction together with the member, and winding between the end of the reverse rotation mode of the cam motor and the start of the normal rotation mode. A take-up side braking member which applies a braking force to the take-up reel stand and which is actuated by the second movable member when the second movable member moves in the other direction to release the application of the braking force to the take-up reel stand. In the process of applying a braking force to the supply-side reel base and setting each of the modes from the end of the reverse rotation mode of the cam motor to the start of the normal rotation mode, and the winding-side braking member A supply-side braking member that releases the application of the braking force to the supply-side reel base in conjunction with the operation of releasing the application of the braking force, and is operated by the rotational force of the cam motor when the cam motor rotates forward. Those formed by and a releasing mechanism for releasing the coupling of the first and second movable member by the coupling mechanism.

Therefore, since the braking force can be applied to the supply-side reel stand and the take-up reel stand from the end of the fast-forward or rewind mode to the start of the reproduction or recording mode, the tape is loosened during that time. There is no fear. Further, since a drive source such as a solenoid for actuating the both braking members is not particularly required, the structure is simple, the size and weight can be reduced, and the cost can be smoothly reduced. Further, since the both braking members are operated by utilizing the movement of the rotating member involved in the mechanism for switching the rotation speeds of both reel stands, the timing of the rotation speed switching operation and the braking member switching operation is complicated. It is possible to achieve high-precision synchronization without using a synchronizing mechanism or the like.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention. FIG. 1 is a plan view of a magnetic recording / reproducing apparatus equipped with a brake device of the present invention, FIG. 2 is a bottom view of the same, and FIG. 3 is a plan view of a cam plate. FIG. 4 is a bottom view of the same, FIGS. 5 and 6 are operation explanatory views of a rotation speed switching mechanism of the same apparatus, and FIG. 7 is a sectional view taken along line VII-VII of FIG.
FIG. 8 is a sectional view taken along the line VIII-VIII, FIG. 9 is a sectional view taken along the line IX-IX in FIG. 6, and FIG. 10 is an explanatory view of the operation of the brake mechanism of the apparatus in the reproducing and recording modes. , FIG. 11 is an operation explanatory diagram in the fast-forwarding and rewinding modes, and FIG. 12 is an operation explanatory diagram of a releasing mechanism portion of the same device. 3 …… Cam motor, 4 …… Capstan motor, 23 ……
Supply side reel stand, 24 ... Winding side reel stand, 45 ... 6th gear (low speed side), 46 ... 7th gear (high speed side), 49
...... First movable member, 50 ...... Second movable member, 52, 53
...... Coil spring (spring), 54 ...... coupling mechanism, 57 ...... release mechanism, 61 ...... supply side braking member, 62 ...... winding side braking member.

Claims (1)

[Scope of utility model registration request] 1. The setting is performed by operating the reproduction mode setting operation body or the recording mode setting operation body in a normal rotation and by rotating the fast-forward mode setting operation body or the rewind mode setting operation body in the reverse rotation. A cam motor that executes a predetermined mode, and a reciprocating motion that can be moved in one direction by the biasing force of a spring. A low speed side gear is interposed in the rotation transmission path from the capstan motor to the reel stand, and the other direction is low speed. A first movable member that moves the side gear to the outside of the rotation transmission path and a reciprocating movement that moves in one direction by the biasing force of a spring When the high speed side gear moves to the outside of the rotation transmission path and moves in the other direction A second movable member that interposes the high speed side gear in the rotation transmission path, and a second movable member that moves together with the first movable member when the first movable member moves in the other direction. A braking force is applied to the take-up reel stand during the period from the end of the reverse rotation mode of the cam motor to the start of the normal rotation mode of the connecting mechanism that connects the movable members to each other. The winding side braking member that is actuated by the second movable member when moving in the other direction and releases the application of the braking force to the winding side reel base, and the cam motor rotates normally after the reverse rotation mode ends. In the process of applying the braking force to the supply side reel base until the mode is started and setting each mode, and in conjunction with the operation of the winding side braking member to release the application of the braking force, the supply side The supply side braking member for releasing the application of the braking force to the reel base and the connection mechanism for releasing the connection of the first and second movable members by the rotational force of the cam motor during the normal rotation of the cam motor. Braking system in a magnetic recording and reproducing apparatus comprising; and a release mechanism for.