JP3195939B2 - Magnetic recording / reproducing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording / reproducing apparatus, and more particularly, to a brake mechanism for stopping the rotation of a reel base.

[0002]

2. Description of the Related Art Generally, a magnetic recording / reproducing apparatus, such as a VTR, which draws a magnetic tape from a magnetic tape cassette and winds the magnetic tape around a rotating drum for recording / reproducing, has a fast-forward mode and a rewind mode for running the tape at high speed. ing. In such a mode, a brake mechanism is provided to brake the rotating reel base holding the magnetic tape. Conventionally, as such a brake mechanism, there is one disclosed in Japanese Patent Application Laid-Open No. 64-88944.

The brake mechanism will be described with reference to FIGS. 6 and 7. The supply-side reel base 1 is braked by the brake 3, while the take-up reel base 2 is braked by the Tu brake 4. A brake spring 7 for urging the brakes 3 and 4 in the braking direction is provided between the brakes 3 and 4. A slider 15 for operating / releasing the brakes 3 and 4 and a return spring 17 for returning the slider 15 are provided in front of the reel bases 3 and 4.
Are provided. A drive arm 23 for driving the slider 15 and a drive arm 2
3 and the pin 2 of the drive arm 23.
4, a double-acting lever 19, a lock lever 18 for holding the slider 15, a double-acting spring 22 provided between the double-acting lever 19 and the lock lever 18, and a lock lever 18 and the chassis 30. Release spring 2 provided between
1 and a solenoid 16 for holding a lock lever 18.

[0004] With such a configuration, the following operation is performed. That is, when the tape is run at high speed, when the cam 34 is rotated in the G direction in the figure by a drive source (motor or the like) not shown, the drive arm 23 swings in the H direction and moves the slider 15 in the A direction. . The brakes 3, 4 are released by the movement of the slider 15. When the slider 15 is further moved, the lock lever 18 is engaged with the pin 27 of the slider 15, and the movable element 34 of the solenoid 16 is returned to be attracted and held by the permanent magnet incorporated in the solenoid 16. Accordingly, the lock lever 18 is held in a state of being engaged with the pin 27.

By rotating the cam 34 in the H direction from this state, the drive arm 23 swings in the E direction. At this time, since the slider 15 is still locked by the lock lever 18, the pin 24 of the drive arm 23 moves away from the slider 15. This results in a high-speed running mode. Then, when the solenoid 16 is energized to release the suction of the solenoid 16 during the high-speed running mode, the brakes 3 and 4 operate and the reel bases 1 and 2 stop.

[0006]

However, such a conventional magnetic recording / reproducing apparatus has the following problems.

In order to transmit the movement of the drive arm 23 following the cam 34 to the brakes 3 and 4, it is necessary to provide a relatively large component called the slider 15. For this reason, the number of components is increased due to the provision of the slider 15 and the components (return spring 17 and the like) attached to the slider 15, thereby increasing the manufacturing cost.

In addition, the slider 15 which is a relatively large component must be arranged in front of the reel bases 3 and 4, and a space for moving the large slider 15 must be formed in the apparatus. Must do so,
Apparatus dimensions (particularly depth dimensions) have increased.

Accordingly, it is an object of the present invention to achieve a reduction in the number of components and a reduction in size.

[0010]

In order to achieve the above object, a magnetic recording apparatus according to the present invention comprises a pair of reel stands that rotate while holding a reel of a magnetic tape cassette, and a pair of reel stands attached to each of the reel stands. the rotation was stopped and
In order, it provided corresponding to the reel stand, respectively, and,
Movably mounted towards the corresponding reel base
Brake bodies, the brake member, respectively, the blurring
Elasticity biasing toward the reel base corresponding to the body
And body, provided in correspondence with the brake member, respectively, or
One, with respect to the corresponding said brake member, the brake body
A cam follower engaged in a direction away from the reel base;
A brake mechanism consisting of, coaxial to the reel stand, respectively
Disposed, and the cam follower corresponding to the reel stand
Engaged with the body, the brake body engages the cam follower
Magnetic recording and reproducing with a disk cam for moving in the direction of rotation
An apparatus, corresponds to the reel base of the one said blur
Solenoid that releases the engagement between the brake body and the cam follower
Mechanism further comprises a, the both disk-cam interlocked with each other
It is configured to rotate, one of the reel base-side
Of the brake body on the other reel base side
In contrast, Li brake of the other reel base side and the other
Has a shape that engages in the direction away from the table ,
In the first rotation mode of the disk cam , one of the
The disk cam on the side of the tool table , the corresponding cam follower ,
Keep the cam follower at a position where it does not engage with the brake body.
Has lifting, the other of said disc cam of the reel stand side, corresponding to
Wherein the cam follower and the other reel stand the cam follower that
By engaging the brake body on the side, the brake body is
Holds a position separated from the other reel base, wherein
The disc cam is at a predetermined angle in one direction from the first rotation mode
In the second rotation mode that is rotated by the one reel
The disc cam of the base side, a corresponding said cam follower, the
Cam follower engages with the brake body on one reel base
By doing so, the brake body separates from one reel base
And, and re brake of the one reel base side of the other
The other rail is engaged with the brake body on the
Where the brake body on the platform side is separated from the other reel platform
It holds the location, the other of the disc cam of the reel base side,
The corresponding said cam follower, Li the cam follower and the other
And hold it at a position where it does not engage with the brake
Cage, the solenoid mechanism is, your in the second rotation mode of
And can be driven arbitrarily to support one reel base.
Release the engagement between the brake body and the cam follower.
It is characterized by being.

[0011]

[0012]

[0013]

According to the present invention , since the braking of the brake body is directly controlled by the cam follower that follows the movement of the disk cam , the brake mechanism can be configured with the minimum necessary number of parts. Also, since the disk cam is arranged coaxially with the reel base,
It is not necessary to provide an arrangement space for the disk cam alone in the apparatus.

[0014]

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a plan view of a main part of a magnetic recording / reproducing apparatus according to an embodiment of the present invention, and FIGS. 2 to 5 are plan views of respective modes, each showing a state where a reel base is removed. I have.

The reel stand 52A for supporting the magnetic recording and reproducing apparatus 50 is rotatably magnetic recording Tepukase' DOO, 52
B, main cam gear 53A, and pinch cam gear 53B
And The reel bases 52A and 52B are rotatably arranged in parallel on the chassis 51, and brake drums 54A and 54B are integrally mounted on the outer periphery thereof. The main cam gear 53A is located between the reel base 52A and the chassis 51 and is arranged coaxially with the reel base 52A. The pinch cam gear 53B is mounted on the reel base 5
It is located between the chassis 2B and the chassis 51, and is arranged coaxially with the reel base 52B. An idler gear 55 is provided between the main cam gear 53A and the pinch cam gear 53B.
3A and 53B are adapted to rotate in conjunction with each other in response to the rotation of a drive source (not shown). Further, cam grooves 56A and 56B are formed on the lower surfaces of the cam gears 53A and 53B, respectively.

On the front side (lower side in the figure) of the main cam gear 53A, a thin plate-like release lever 57 serving as a cam follower is provided.
Is provided. The release lever 57 is interposed between the main cam gear 53A and the chassis 51, and is attached to the chassis 51 so as to be able to swing around a swing shaft 57a provided at the center in the longitudinal direction. Release lever 57
A driven pin 57b is provided upright on one end side, and the engaging pin 57b is engaged with the cam groove 56A. The other end of the release lever 57 extends outside the brake drum 54A, and an engagement pin 57c is provided upright at the other end.

Between the pinch cam gear 53B and the chassis 51, there is provided a thin plate-like release lever 58 which is a cam follower. The release lever 58 is attached to the chassis 51 so as to be swingable about a swing shaft 58a provided at the center in the longitudinal direction. A driven pin 58b is provided upright on one end of the release lever 57, and the engagement pin 58b is engaged with the cam groove 56B. The other end of the release lever 58 extends outside the brake drum 54B, and an engagement pin 58c is provided upright at the other end.

Brake levers 59, 60 are provided on the front side (lower side in the figure) of the idler gear 55 to contact the brake drums 54A, 54B to brake the reel bases 52A, 52B. These brake levers 5
Reference numerals 9 and 60 denote swing shafts 59a provided at the center in the longitudinal direction.
It is attached to the chassis 51 so as to be able to swing around the center 60a.

One ends of the brake levers 59 and 60 extend toward the brake drums 54A and 65B, respectively. Brake shoes 61A and 61B which are in contact with the peripheral surfaces of the brake drums 54A and 54B are attached to the tips. I have. The other ends of the brake levers 59, 90 extend in the direction opposite to the brake shoes 61A, 61B, and the other ends are connected by a brake spring 62, which is a tension spring. Brake lever 5
9 and 60, the brake shoes 62A and 61B are moved by the brake springs 62 to the brake drums 54A and 54B.
Elastically biased in the direction in which it comes into contact with

The central portion of the brake lever 59 in the longitudinal direction is
The first extending end 59b extending toward the main cam gear 53A (left side in the figure) extends in a direction substantially orthogonal to the longitudinal direction, and has an engaging pin 57c and the main cam gear 53.
It passes between the A peripheral surface and slightly extends to the left side in the figure. The slope 63 provided at the first extension end 59b is
When the brake lever 59 swings, it engages with the engagement pin 57c. On the other hand, a second extension end 59c of the brake lever 59 extending toward the brake lever 60 extends to an intermediate position between the brake levers 59 and 60.

The longitudinal center of the brake lever 60 is
The first extension end 60b extends in a direction substantially perpendicular to the longitudinal direction, and extends to the pinch cam gear 53B side (right side in the drawing) beyond the upper side (upper side in the direction perpendicular to the paper) of the engagement pin 58c. And extends slightly further to the right in the figure. An engagement member 64 is attached to the first extension end 60b. When the brake lever 60 swings, the slope 65 of the engagement member 64 engages with the engagement pin 58c. I have. On the other hand, the second extension end 60c of the brake lever 60 extending to the brake lever 59 side extends to a position beyond the tip of the second extension end 59c. Further, the second extension end 60c is located closer to the apparatus than the second extension end 59c (the lower side in the figure), and by being disposed in this manner, the second extension end 59c is connected to the second extension end 59c. The second extension ends 60c are engaged with each other.

With the release lever 57 interposed, the brake lever 5
An L-shaped holding lever 66 and a solenoid 67 are provided at a position opposite to 9. The holding lever 66 is attached to the chassis 51 so as to be swingable about a swing shaft 66a provided at a central portion in the longitudinal direction. One end of the holding lever 66 extends toward the engaging pin 57c, and at one end thereof, a slope 66b and a side face 66c that engage with the engaging pin 57c are formed. At the other end of the holding lever 66, a pin 66d is provided upright. Solenoid 67
Is fixed on the chassis 51 located on the other end side of the holding lever 66, and the operating arm 67a of the solenoid 67
Is engaged with the pin 66d. The release lever 57 is connected to the central portion of the holding lever 66 in the longitudinal direction by an interlocking spring 68.

As described above, in the magnetic recording / reproducing apparatus 50, the brake levers 59, 60, the brake spring 62, and the holding lever 6 are located closer to the apparatus than the reel stands 52A, 52B.
6, and the relatively small parts of the solenoid 67,
Since they are arranged efficiently, these components do not increase the depth of the apparatus, but reduce the size. Furthermore, since the main cam gear 53A and the pinch cam gear 53B, which are inevitably large in operation, are arranged coaxially with the reel bases 52A and 52B, the size is reduced accordingly. In addition, since the size (diameter) of the main cam gear 53A and the pinch cam gear 53B can be maintained relatively large without sacrificing miniaturization of the apparatus, the shape of the cam grooves 56A, 56B can be changed by releasing the release levers 57, 58. A shape suitable for smooth operation can be made with a margin.

In this embodiment, the brake lever 5
The main cam gear 53A, the pinch cam gear 5, the brake spring 62, the release springs 57, 58, and the cam followers, respectively.
3B corresponds to the disk cam in the claims. Ma
The solenoid 67, the holding lever 66, and the interlock spring 68
Constitutes the solenoid mechanism in the claims. Further
In each of the operation modes described below,
Mode corresponds to the first rotation mode in the claims,
Play mode and high-speed driving mode (brake released state)
Corresponds to the second rotation mode in the claims.

Next, the operation of the magnetic recording / reproducing apparatus 50 in each mode will be described.

Standby mode In this mode, as shown in FIG.
Due to the rotation angle of 3B, the release lever 58 that engages with the cam groove 56B is at the position where it is pivoted most counterclockwise in the drawing. Therefore, the brake lever 60 is pivoted counterclockwise in the figure by the engagement pin 58c, and the brake shoe 61
B is separated from the brake drum 54B. In addition, since the counterclockwise swing of the brake lever 60 is transmitted to the brake lever 59 by the brake spring 62, a force that swings counterclockwise is applied.

On the other hand, according to the rotation angle of the main cam gear 53A, the release lever 57 which engages with the cam groove 56A is shown in FIG.
It is near the position where it oscillated most counterclockwise. for that reason,
The engagement pin 57c is separated from the slope 63 and the side 66c.
It is in the position engaged with. Therefore, the brake lever 5
9 is pulled by the brake spring 62,
Swings counterclockwise, the brake shoe 61A is in contact with the brake drum 54A, and brake the reel table 52A.

Since the engaging pin 57c is engaged with the side face 66c, the holding lever 66 swings clockwise in the drawing against the interlocking spring 68, and the pin 66d pulls out the operating lever 67a from the solenoid 67. ing.

Play Mode In this mode, as shown in FIG. 3, the drive is transmitted from a rotary drive source (not shown) to
3A, idler gear 55 and pinch cam gear 53B rotate by a predetermined angle. At this time, the main cam gear 53A and the pinch cam gear 53B rotate clockwise. Therefore, the driven pin 57b moves radially outward of the main cam gear 53A along the cam groove 56A, whereby the release lever 57 swings counterclockwise. Then, the engagement pin 57c separates from the side surface portion 66c and engages with the slope portion 63 to swing the brake lever 59 clockwise.
Thus, the brake shoe 61A is
To make the reel base 52A rotatable.

The holding lever 66 having the engaging pin 57c separated from the side surface 66c swings counterclockwise by the pull of the interlock spring 68 accompanying the swing of the release lever 57. Therefore, the pin 66d pushes the operating lever 67a toward the main body of the solenoid 66, whereby the solenoid 67 locks the operating lever 67a immovably.

When the brake lever 59 swings clockwise, the second extended end 59c is moved to the brake lever 60.
And the second extension end 60c, thereby preventing the brake lever 60 from swinging clockwise.

On the other hand, the rotation of the pinch cam gear 53B causes the driven pin 58b to move along the cam groove 56B radially outward of the cam groove 56B from the standby mode. As a result, the release lever 58 swings clockwise, whereby the engagement pin 58c moves to the left in the drawing and separates from the slope 65. However, at this time, the second extension end 59c is engaged with the second extension end 60c to prevent the brake lever 60 from swinging clockwise.
The brake shoe 61B maintains a state of being separated from the brake drum 54B.

As described above, in the play mode, the reel base 5
Both 2A and 52B are separated from the brake shoes 61A and 61B and are in a rotatable state. Therefore, by rotating these reel bases 52A and 52B with a rotation drive source (not shown), a reproduction / recording operation becomes possible.

High - speed running mode (brake release state) In this mode, as shown in FIG. 4, the main cam gear 53A and the pinch cam gear 53B further rotate clockwise by a predetermined angle. Then, the driven pin 57b is
It reaches a large groove 69 having a large groove width provided at the end of 6A. Accordingly, the driven pin 57b does not engage with the cam groove 56A. At this time, the release lever 57 is urged clockwise by the interlocking spring 68,
Is engaged with the engagement pin 57c, the release lever 57
Does not swing clockwise. The holding lever 6
Numeral 6 is held at a position pivoted counterclockwise by a solenoid 67. On the other hand, the pinch cam gear 53B
, The driven pin 58b is positioned at the end of the cam groove 56B. However, this cam groove 56
The position of the engagement pin 58b at the end B is almost the same as that in the play mode because the position in the radial direction of the pinch cam gear hardly changes from that in the play mode. Therefore, the brake lever 60 maintains the state in which the clockwise swing is prevented by the engagement between the second extension end 59c and the second extension end 60c.

As described above, in the brake release state in the high-speed running mode, both the reel bases 52A and 52B are separated from the brake shoes 61A and 61B and are in a rotatable state. Therefore, these reel stands 52A, 52B
Is rotated by a rotary drive source (not shown) to enable high-speed traveling.

High - speed running mode (brake operating state) This mode indicates a state where the brake is operated during high-speed running.

In the high-speed running mode, as shown in FIG. 5, a current is applied to the solenoid 67 to stop the locking of the operating lever 67a. Then, the operating lever 6
7a is extended, and this extension causes the holding lever 66 to extend.
Swings clockwise. When the holding lever 66 swings clockwise, the slope 66b and the engagement pin 57c are disengaged, and the release lever 57 swings clockwise by the interlock spring 68. This swinging operation is possible because the driven pin 57b moves in the large groove 69. When the release lever 57 swings clockwise, the engagement pin 57c and the slope 63 are disengaged, and the brake lever 59 becomes unrelated to the release lever 57.

On the other hand, in the high-speed running mode (brake release state), the brake lever 60 loses the engagement relationship with the engagement member 64 and is in a state irrelevant to the release lever 58. Therefore, both brake levers 5
9 and 60 are only connected by the brake spring 62. At this time, the brake spring 62 is disposed between the brake levers 59 and 60 with an elastic force that urges the brake levers 59 and 60 in a direction to contact the brake drums 54A and 54B. Therefore, the brake levers 59 and 60 swing in the directions in contact with the brake drums 54A and 54B, respectively. Therefore, each brake shoe 61A, 61B comes into contact with the brake drum 54A, 54B, and the reel bases 52A, 52B
Will be braked.

[0040]

As described above, according to the present invention, since the braking of the brake body is directly controlled by the cam follower that follows the movement of the disk cam , the brake mechanism can be controlled with the minimum necessary number of parts. With this configuration, the number of parts can be reduced and the cost can be reduced. In addition, the size of the device can be reduced, and in particular, the depth of the device can be reduced. Also, the disk cam is mounted on a reel base.
And the space for the disk cam alone.
There is no need to install it inside the device, and
The size can be reduced.

[0041]

[Brief description of the drawings]

FIG. 1 is a plan view of a main part of a magnetic recording and reproducing apparatus according to an embodiment of the present invention.

FIG. 2 is a plan view illustrating a state of a standby mode according to the embodiment.

FIG. 3 is a plan view showing a state of a play mode of the embodiment.

FIG. 4 is a plan view showing a state in a high-speed running mode (when a brake is released) according to the embodiment.

FIG. 5 is a plan view showing a state in a high-speed running mode (during brake differential) according to the embodiment.

FIG. 6 is a plan view of a main part of a conventional magnetic recording / reproducing apparatus.

FIG. 7 is an enlarged view of a main part of FIG. 7;

[Explanation of symbols]

 52A, 52B Reel stand 53A Main cam gear 53B Pinch cam gear 57 Release lever 58 Release lever 59, 60 Brake lever 62 Brake spring

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G11B 15/18 G11B 15/22 G11B 15/30

Claims (1)

(57) [Claims] 1. A pair of reel mounts which holds and rotates the reel of the magnetic tape cassette, in order to stop the rotation in association with these reel stand, respectively, said reel stand Resona
Re provided corresponding to, respectively, and the corresponding said reel table
A brake member movably mounted toward the front
The serial braking body, respectively, before corresponding to the brake body
An elastic body biasing toward the reel base, and the brake
Provided corresponding to the respective body, and said corresponding blur
Against a rk body, the brake member is away from the reel stand
Brake machine consisting of a cam follower engaged in the opposite direction
And configuration, are arranged coaxially to the reel stand, respectively, and those
Engaged with the cam follower corresponding to the reel stand, the
Moving the cam follower in the direction of engagement with the brake body,
A magnetic recording and reproducing apparatus and a disc cam that, the mosquitoes and the brake member corresponding to one reel stand of the
Further equipped with a solenoid mechanism to release engagement with the
And has the both disk cam is configured to rotate in conjunction with each other
It is, in the brake of the one reel base side, the other reel stand
To the side of the brake body, shaking of the other reel table side
Form in which the body is engaged in the direction away from the other reel base
Has Jo, in a first rotation mode of the disc cam, one of Li
The disk cam on the side of the tool table , the corresponding cam follower ,
Keep the cam follower at a position where it does not engage with the brake body.
Has lifting, the other of said disc cam of the reel stand side, corresponding to
Wherein the cam follower and the other reel stand the cam follower that
By engaging the brake body on the side, the brake body is
It holds a position separated from the other reel base, given from one direction the disc cam the first rotation mode
In the second rotation mode rotated by an angle , one
The disk cam on the side of the tool table , the corresponding cam follower ,
The cam follower is connected to the brake body on one of the reel bases.
By engaging , the brake body moves from one reel base
The brake body on one reel base side is separated from the other
And engages with the brake body on the side of the reel base.
The brake body on the reel table side is separated from the other reel table
At the same position, and the disk
Beam is the corresponding said cam follower, the cam follower and the other
Held at a position of not engaging with the brake body of Li Lumpur platform side
And it is, the solenoid mechanism is in the second rotation mode
By being driven arbitrarily, before it corresponds to one reel base
Disengaging the brake body and the cam follower
In a magnetic recording and reproducing apparatus characterized by.