JPH09204711A - Brake device of magnetic recording and reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the number of components by making reel bases instantaneously braked when the abutting of a trigger provided on a brake arm, by which the released state of brake is maintained, is released. SOLUTION: The reel bases 21, 22 are braked in the manner of pressing the brake arms 9, 10 in contact therewith by a spring 11. A brake lever 31 is moved by the rotation of a driving motor 1 through a main gear 30 and a cam groove 30a, and with the cam part 31b, the braked state of the reel bases 21, 22 are released by pressing a protruding part 10a of the brake arm 10. When the pressurized state is released by the movement of the brake lever 31 in the direction opposite to its aforementioned movement, the trigger 32 of the brake arm 10 is abutted on a shaft 2a to maintain the released state of brake, then the magnetic tape is fast forwarded. The abutted state is released by the stop operation, and the brake arms 9, 10 are instantaneously pressed in contact with the reel bases 21, 22, thereby the reel bases are braked.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a brake device for a magnetic recording / reproducing apparatus (including a reproduction-only machine) having a brake arm for braking a reel stand on which a magnetic tape runs. It is about.

[0002]

7 to 10 show a brake device of a conventional magnetic recording / reproducing apparatus of this type, and FIG. 7 shows FF / REWIND (brake release state in the case of fast forward or rewind). Top view, Figure 8 shows FF / RE
FIG. 9 is a plan view showing a state in which the drive motor reversely rotates from the WIND mode and the trigger is kicked, FIG. 9 is a plan view showing the reset mode (brake state), and FIG. 10 is an exploded perspective view in which an essential part is enlarged. In these figures, 1 is a drive motor, 2 is a worm gear fixed to the output shaft of the drive motor 1, 3 is installed near the end of the worm gear 2, and a torsion spring 4 mounted on the output shaft of the drive motor 1 is a drive motor. The blades 5 loosely fitted to the output shaft of the motor 1 and engaged with the torsion spring 3 are thrust receivers that prevent the blade 4 from falling off the output shaft of the drive motor 1.

The above-mentioned torsion spring 3 is a drive motor 1
In a predetermined one-way rotation of, for example, the rotation of the arrow 1b in the figure, a closing operation is performed in close contact with the output shaft of the drive motor 1,
Along with this, the blades 4 rotate integrally with the rotation of the drive motor 1. In addition, when the drive motor 1 is rotated in the direction of arrow 1a in the figure, the torsion spring 3 performs an opening operation in which the contact with the output shaft of the drive motor 1 is released, and the blades 4 output the output of the drive motor 1 accordingly. The sliding motion is possible relative to the shaft. That is, the torsion spring 3 and the blade 4 constitute a one-way mechanism that rotates integrally with the rotation of the drive motor 1 only when the drive motor 1 rotates in a predetermined direction. Such one-way mechanism is well known.

Further, in FIG. 7 and the like, 6 is a reduction gear which works in conjunction with the worm gear 2, and is rotatably mounted on a shaft 20a provided on a chassis 20 forming the main body of this magnetic recording / reproducing apparatus and meshes with the worm gear 2. It comprises a worm wheel 6b and a gear 6a provided integrally with the worm wheel 6b. 7 is a gear 6a of the reduction gear 6
A main cam gear that meshes with a shaft 20b provided on the chassis 20 and is rotatably mounted on the upper surface of which a cam groove 7a is formed.

Reference numerals 21 and 22 shown in FIG. 7 and the like are reel stands on which a magnetic tape (not shown) is run. Brake arms 9 and 10 respectively brake the reel bases 21 and 22, and are rotatably mounted on shafts 20d and 20e provided on the chassis 20, respectively. These brake arms 9,
10 are connected to each other by a spring 11. In addition,
The brake arm 9 is provided with a protrusion 9a that hangs downward. Reference numeral 13 is a rotation direction for braking the above-mentioned brake arms 9 and 10 on the reel stands 21 and 22, and the reel stand 2
This is a slider for selectively operating the motors 1 and 22 in the rotation direction without braking. The slider 13 has a cam 13c on the upper surface that engages with the protrusion 9a provided on the brake arm 9 described above, and guide pins 20g of the pair of sliders 13 provided on the chassis 20 are relatively loosely fitted to each other. It has a long hole 13b.

A spring 15 has one end connected to the chassis 20 and the other end connected to the slider 13. Reference numeral 12 is a trigger rotatably mounted on a shaft 13a provided on the slider 13, and when the slider 13 is slid against the tensile force of the spring 15, the blade 4 forming the above-mentioned one-way mechanism.
Can be engaged. As shown in FIG. 10, the trigger 12 is provided with a protrusion 12a that hangs downward. Reference numeral 16 denotes a spring, one end of which is connected to the slider 13 and the other end of which is connected to the trigger 12.
2 is urged in the rotation direction to bring the blade 4 closer to the central portion of the blade 4. As shown in FIG. 10, the slider 13 described above is used.
The end surface of the cam 13c of FIG.
A stopper 13d for restricting the rotation of the blade 4 toward the central portion due to the force of the above-mentioned spring 16 is configured.

Reference numeral 8 denotes a brake lever, and a hole 8c formed in the brake lever 8 has a shaft 2 provided in the chassis 20.
It is rotatable by being inserted into 0c.
As shown in FIG. 10, the brake lever 8 is provided with a pin 8a which is loosely fitted in the cam groove 7a of the main cam gear 7 described above on the left side portion in the drawing, and is provided on the trigger 12 described above in the lower portion in the drawing. The inverted L-shaped protrusion 8b engageable with the protrusion 12a is provided. As shown in FIG. 10 and the like, the chassis 20 is integrally formed with a stopper 20f that restricts the return movement of the slider 13 due to the force of the spring 15, and the stopper 20f has a contact portion with the slider 13. Is attached with a cushioning material 14 that absorbs an impact sound when the slider 13 abuts.

The operation of the prior art thus configured is as follows. For example, when in the reset mode (brake state) shown in FIG. 9, the brake shoes of the brake arms 9 and 10 come into contact with the peripheral surfaces of the reel bases 21 and 22 and engage with the protrusions 9 a of the brake arm 9 c 13 c. The end of the slider 13 provided with the abutting member abuts on the cushioning material 14 provided on the stopper 20f by the force of the spring 15, and the trigger 12 on the slider 13 is acted by the force of the spring 16 on the cam
The protrusion 12a of the trigger 12 faces (is not engaged with) the protrusion 8b of the brake lever 8 by contacting the stopper 13d formed on the end face of the trigger 3c, and the tip of the trigger 12 is the blade 4.
Is not engaged with.

When the drive motor 1 rotates in the direction of arrow 1a in FIG. 10 from this state, the worm gear 2 rotates in the same direction, the reduction gear 6 rotates clockwise in FIG. 9, and the main cam gear 7 passes through the gear 6a. Rotates counterclockwise. Along with this, the brake lever 8 rotates clockwise in FIG. 9 via the pin 8a engaged with the cam groove 7a of the main cam gear 7, and engages with the protrusion 8b of the brake lever 8 to trigger. The protrusion 12a of 12 moves in the direction of arrow 13e in FIG. 9, the slider 13 moves integrally with it in the direction of arrow 13e, and the cam 13c of the slider 13 pushes the brake arm 9 against the force of the spring 11. Then, the brake arm 9 is rotated in the clockwise direction in FIG. 9, and the brake arm 10 is also rotated in the counterclockwise direction in cooperation with the brake arm 9 to release the braking on the reel bases 21 and 22.

From this state, the main cam gear 7 further rotates, the brake lever 8 rotates clockwise, and the trigger 1
When the slider 2 and the slider 13 move further in the direction of the arrow 13e, the tip of the trigger 12 engages with the blade 4. This feather 4
As described above, the rotation direction of is the direction of arrow 1a in FIG. 10, and the rotation of the blade 4 tends to urge the trigger 12 in the direction of arrow 12b in FIG. 13 is engaged with the cam 13c,
This keeps it unrotatable. Therefore, the blades 12 are stopped from rotating by the trigger 12, the torsion springs 3 engaged with the blades 4 are opened, and the blades 4 are opened.
Is in a state of relatively slipping on the output shaft of the drive motor 1. When the position of the trigger 12 reaches a predetermined position, the shift to the FF / REWIND mode is completed, a mode switch (not shown) is activated, and the drive motor 1 is stopped by the signal. FIG. 7 shows the state at this time. As a result, the magnetic tape (not shown) mounted on the reel stands 21 and 22 can run at high speed.

To cancel the FF / REWIND mode shown in FIG. 7, the drive motor 1 is rotated in the direction opposite to the above-described direction of rotation, that is, the direction indicated by the arrow 1b in FIG. At this time, the rotation direction of the drive motor 1 coincides with the closing direction of the torsion spring 3, and the blade 4 rotates integrally with the output shaft of the drive motor 1 and the blade 4
While not rotating once, that is, instantaneously, the tip of the trigger 12 is kicked by the blade 4 in the direction indicated by arrow 12c in FIG. As a result, the trigger 12 rotates, and the protrusion 12a of the trigger 12 and the protrusion 8b of the brake lever 8 are disengaged from each other in the horizontal direction in the drawing, and the force of the spring 15 causes the slider 13 to move in the direction of arrow 13f in FIG. Sliding, slider 13
Collide with the cushioning material 14 of the stopper 20f, the brake arm 9 rotates counterclockwise, and the brake arm 10 rotates clockwise, and the reel bases 21 and 2 are instantly rotated.
The brake shoe 2 comes into contact with the brake shoe 2 to bring it into a braking state. The state at this time is as shown in FIG.

In the state shown in FIG. 8, the protrusion 12a of the trigger 12 is located above the protrusion 8b of the brake lever 8 in the figure. When the drive motor 1 continues to rotate in the direction of the arrow 1b in FIG. 10 from such an intermediate state, the main cam gear 7 moves through the worm gear 2 and the reduction gear 6 in FIG.
8 in the direction of arrow 7c, that is, in the clockwise direction in FIG. 8, the brake lever 8 rotates in the counterclockwise direction in FIG. 8 via the pin 8a engaged with the cam groove 7a. While the brake lever 8 rotates to a predetermined position, the protrusion 8b of the brake lever 8
The trigger 12 is disengaged from the protrusion 12a of the trigger 12 in the upward direction in the drawing, and the force of the spring 16 causes the trigger 12 to rotate counterclockwise in FIG. 8 to hit the stopper 13d of the cam 13c of the slider 13 and stop. This state is detected by the mode switch, and the drive motor 1 is stopped by the signal. As a result, the reset mode (brake state) shown in FIG. 9 is entered.

[0013]

DISCLOSURE OF THE INVENTION In a conventional magnetic recording / reproducing apparatus braking device having the above-described structure,
Brake arms 9, 10 for braking the reel stands 21, 22
13 for rotating the FF / REWIND mode (brake release state) or reset mode (brake state), the spring 1 for driving this slider 13
5, a spring 16 for rotating the trigger 12, and a slider 1
Since it is necessary to provide the cushioning material 14 that absorbs the impact sound at the time of abutting the contact point 3, the torsion spring 3, the blade 4, the thrust receiver 5 and the like that constitute the one-way mechanism, the number of parts becomes very large. However, the structure is complicated and the assembly is not easy. Along with this, there are problems that the production cost becomes high and the parts management becomes complicated.

When the slider 13 comes into contact with the stopper 20f, the impact sound is still offensive although the cushioning material 14 is present. The present invention has been made in view of the above-mentioned conventional circumstances, and a first object of the present invention is to provide a brake device for a magnetic recording / reproducing apparatus, which has a small number of parts, has a simple structure, and is easy to assemble. Especially. A second object is to provide a braking device for a magnetic recording / reproducing apparatus which can eliminate the impact sound generated when the slider abuts on the stopper, in addition to the first object.

[0015]

In order to achieve the first object, the invention according to claim 1 is a brake of a magnetic recording / reproducing apparatus provided with a brake arm for braking a reel stand on which a magnetic tape is run. In the apparatus, the brake arm is rotatably provided with respect to a chassis forming the magnetic recording / reproducing apparatus main body, and the brake arm is selectively rotated in a rotation direction in which the reel base is braked and in a rotation direction in which the reel base is not braked. A brake lever to be operated, a driving body to drive the brake lever, and a brake arm not to brake the reel base even when the brake lever is operated in a rotation direction to brake the reel base. And holding release means for releasing the holding of the brake arm by the holding means. It is a brake system of the gas-recording and reproducing apparatus. In order to achieve the second object, the invention according to claim 1 eliminates a member that collides and makes a sound when the holding by the holding means is released by the holding release means. It is characterized by that.

[0016]

According to the present invention having the above-described structure, when the brake lever is actuated and the brake arm is rotated in a rotation direction that does not brake the reel base, the brake arm moves the reel base through the brake lever. The vehicle is not braked and is kept in a predetermined reset mode (first brake release state).
When the brake lever is operated from this reset mode and the brake arm is rotated in the rotation direction for braking the reel stand, the holding means is operated and holds the brake stand so that the brake arm does not brake the reel stand. It is kept in FF / REWIND mode (second brake release state).

Further, when the holding release means is operated from the FF / REWIND mode and the holding of the brake arm by the holding means is released, the brake arm rotates in the direction for braking the reel base to enter the braking state. Further, from this state, the brake lever operates, and this brake lever rotates the brake arm in a direction in which the reel base is not braked, and the predetermined reset mode (first brake release state) described above is maintained. A prior art slider,
A spring that drives the slider, a spring that rotates the trigger, and a cushioning material that absorbs impact noise when the slider abuts,
In addition, parts such as a torsion spring, a blade, and a thrust receiver that make up the one-way mechanism are unnecessary, and drive control of the brake arm for braking or releasing the reel base can be realized with a small number of parts. Further, since there is no slider itself for generating impact noise, impact noise is not generated.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to FIGS. FIG. 1 is a plan view showing a reset mode (first brake release state), and FIG.
FIG. 3 is a plan view showing the F / REWIND mode (second brake release state), and FIG. 3 is a plan view showing the state (brake state) in which the drive motor reversely rotates from the FF / REWIND mode and the trigger is released. 4 is an enlarged vertical cross-sectional view of the trigger periphery of FIG. 1 viewed from the arrow direction, FIG. 5 is an enlarged vertical cross-sectional view of the trigger periphery of FIG. 2 viewed from the arrow direction, and FIG. 6 is an arrow around the trigger periphery of FIG. It is an expanded longitudinal cross-sectional view seen from the direction. The same parts as those shown in FIGS. 7 to 10 described above are designated by the same reference numerals. Worm gear 2 and reduction gear 6
Is a rotation transmission means for transmitting the rotational force of the drive motor 1 as the rotational force of the main cam gear 30. In particular, the worm gear 2 has a shaft 2a that rotates integrally with the worm gear 2 at its end.

Reference numeral 31 denotes a brake lever which is driven by the main cam gear 30 and is rotatable with respect to a shaft 20h provided on the chassis 20, and has a pin 31a which engages with a cam groove 30a of the main cam gear 30. At the same time, the cam portion 31 that engages with the protrusion 10a of the brake arm 10
b is provided. By the cam portion 31b, the brake arms 9 and 10 are selectively rotated in a rotation direction in which the reel bases 21 and 22 are braked and in a rotation direction in which the reel bases 21 and 22 are not braked. Further, reel stands 21 and 22 for running a magnetic tape (not shown) and brake arms 9 and 1 for braking the reel stands 21 and 22, respectively.
0 and a spring 11 connecting these brake arms 9 and 10 are provided, and the brake arm 9 is formed with a cam portion 9b that engages with a pin 10c of the brake arm 10. The brake arm 10 holds the protrusion 10a and the brake arms 9 and 10 so that the brake arms 9 and 10 do not brake the reel tables 21 and 22 even when the brake arms 9 and 10 are rotated in a direction to brake the reel tables 21 and 22. A shaft 1 to which a trigger 32, which constitutes a holding means for
0b and a pin 10c that engages with the cam portion 9b of the brake arm 9 are formed.

A resin spring portion 32 is integrally formed with the trigger 32.
a is molded, and the resin spring portion 32a causes the trigger 32
Is urged counterclockwise in FIGS. 4 to 6, and the stopper portion 32b of the trigger 32 causes the brake lever 1 to move.
It is brought into contact with the edge portion of 0 and locked. Further, the shaft 2a formed integrally with the worm 2 constitutes a holding releasing means for releasing the holding of the brake arms 9 and 10 by the trigger 32 which is the holding means described above. In addition,
20a to 20e are shafts provided on the chassis 20.

Reel stand 2 in the above-mentioned brake device
Braking and braking releasing operations 1 and 22 are as follows.
For example, in the reset mode shown in FIG. 1 (first brake release state), the protrusion 10a of the brake arm 10 is pushed by the cam portion 31b of the brake lever 31, and the reel stand resists the force of the spring 11. 21 is stopped at a position where it is not braked. Further, the pin 10c of the brake arm 10 pushes the cam portion 9b of the brake arm 9, and the brake arm 9 also stops at the position where the reel base 21 is not braked against the force of the spring 11. FIG. 4 is an enlarged vertical cross-sectional view of the periphery of the trigger 32 in this stopped state as seen from the direction of the arrow. The trigger 32 is attached counterclockwise by a resin spring portion 32a formed integrally with the trigger. A stopper portion 32b, which is biased and is formed integrally with the trigger 32, is brought into contact with the edge portion of the brake arm 10 and locked. Further, the end 32c of the trigger 32 is connected to the shaft 2a of the worm gear 2.
Located away from

From this state, the drive motor 1 rotates clockwise in FIG. 4, the worm gear 2 rotates in the same direction, and the reduction gear 6 rotates in the clockwise direction in FIG. 1 accordingly. The main cam gear 30 rotates counterclockwise. As a result, the brake lever 31 passes through the pin 31a engaged with the cam groove 30a of the main cam gear 30.
Rotates in the clockwise direction in the drawing, and accordingly, the cam portion 31b
The brake arms 9 and 10 start to rotate in a direction to brake the reel bases 21 and 22 via the protrusion 10a engaged with. When the brake lever 31 further rotates clockwise, the trigger 32 attached to the brake arm 10
Shaft 2 having an end 32c of the shaft integrally formed with the worm gear 2
The brake arm 10 comes into contact with a and stops the rotation of the brake arm 10. Further, the cam portion 9b is pushed by the pin 10c, and the brake arm 9 also stops rotating. Further, when the brake lever 31 rotates clockwise, the cam portion 31 of the brake lever 31
b is separated from the protrusion 10a of the brake arm 10.
When the mode switch (not shown) detects that the position of the brake lever 31 is at the predetermined position, the drive motor 1 is stopped by the signal.

FIG. 5 is an enlarged vertical sectional view of the periphery of the trigger 32 in this state as seen from the direction of the arrow in FIG. 2. The end portion 32c of the trigger 32 is integrally formed with the worm gear 2 on the shaft 2a. Since the trigger 32 is locked by the stopper 32b so that it cannot rotate from the time when the drive motor 1 stops rotating after the contact with the shaft, the end 32c and the worm gear 2 are integrally formed with the shaft. It is in a state of slipping relative to 2a. FIG. 2 shows the FF / REWIND mode (second brake release state) formed by such an operation. At this time, the magnetic tape (not shown) mounted on the reel stands 21 and 22 runs at high speed as is well known.

When the FF / REWIND mode (second brake release state) shown in FIG. 2 is released, the drive motor 1 is rotated in the rotation direction opposite to the rotation direction described above. That is, the shaft 2a shown in FIG. 5 rotates counterclockwise.
At this time, the trigger 32 that is in contact with the shaft 2a is
The frictional force received by 2c rotates clockwise against the resin spring 32a. Here, as shown in FIG.
The following forces act on. That is, the traction force G by the spring 11 received from the protrusion 10a of the brake arm 10, the force G'received from the shaft 2a as its reaction force, and the friction between the protrusion 10a of the brake arm 10 and the bearing 32d of the trigger 32. Force μG, the shaft 2a and the end 32c of the trigger 32
The frictional force μ′G ′ between the resin spring portion 32 and the trigger 32
The force F received from the brake arm 10 by a acts.

At this time, the total moment M for rotating the trigger 32 in the counterclockwise direction is M = L × F + r × μG, and the total moment M for rotating the trigger 32 in the clockwise direction. 'Is M' = L '× μ'G' Note that the relationship between M and M'described above is set so as to satisfy M '> M.

The trigger 32, which has started to rotate clockwise against the resin spring 32a due to the frictional force between the shaft 2a and the end portion 32c of the trigger 32, does not rotate the shaft 2a once, that is, instantaneously. Holding of the trigger 32 on the brake arm 10 is released by the pulling force of the spring 11, and the brake arm 10 slides to the left above the shaft 2a shown in FIG. 5 together with the brake arm 10, so that the brake arm 10 moves in the clockwise direction shown in FIG. Rotate counterclockwise, and instantly reel stand 2
It contacts the Nos. 1 and 22 and enters a braking state. FIG. 3 shows a braking state formed by such an operation. Even at this time, the cam portion 31b of the brake lever 31 is still separated from the protrusion 10a of the brake arm 10.

Further, FIG. 6 shows the trigger 32 in this state.
FIG. 3 is an enlarged vertical cross-sectional view of the periphery of the device as viewed from the direction of the arrow, but the trigger 32 is in a state of riding on the shaft 2a. When the drive motor 1 further rotates in the counterclockwise direction shown in FIG. 6 from this state, the worm gear 2 rotates in the same direction, and accordingly, the reduction gear 6 rotates counterclockwise in FIG. 3 to move the gear 6a. The main cam gear 30 rotates in the clockwise direction. As a result, the brake lever 31 passes through the pin 31a engaged with the cam groove 30a of the main cam gear 30.
Rotates counterclockwise in the drawing. Along with this, the cam portion 31b of the brake lever 31 comes into contact with the protrusion 10a of the brake arm 10 and further presses the protrusion 10a. As a result, the brake arm 10 resists the spring 11 as shown in FIG.
In the counterclockwise direction shown by, the brake arm 9 is also pushed by the pin 10c of the brake arm 10 and rotates in the clockwise direction. That is, the brake arms 9 and 10 start to rotate in a direction in which the reel bases 21 and 22 are not braked through the engaged protrusion 10a.

In FIG. 6, the trigger 32 moves to the right in the drawing above the shaft 2a together with the brake arm 10 to move the shaft 2 to the right.
It is separated from a and is rotated by the resin spring 32a in the counterclockwise direction and is locked by the stopper 32b as described above. Then, when the mode switch (not shown) detects that the position of the brake lever 31 is at the predetermined position, the drive motor 1 is stopped by the signal. This returns to the reset mode (first brake release state) shown in FIG. 1 described above. In particular, in this embodiment, because of the above-described configuration, the slider 13, the spring 15 for driving the slider 13, the spring 16 for rotating the trigger 12, and the slider 13 which have been conventionally required are provided. The cushioning material 14 which absorbs the impact sound at the time of contact, the torsion spring 3, the blade 4, which constitutes the one-way mechanism,
Parts such as thrust receiver 5 are no longer needed, and reel stand 2
The drive control of the brake arms 9 and 10 for braking or releasing the brakes 1 and 22 can be realized with a small number of parts, and the production cost can be kept low. Further, since there is no slider 13 itself for generating an impact sound, the impact sound is not generated.

Here, the superiority of this embodiment will be described again by comparing the embodiment of the present invention with the conventional one described above. Generally, in this type of magnetic recording / reproducing apparatus, when fast-forwarding or rewinding a magnetic tape,
The braking of the reel stand of the two reels around which the magnetic tape is wound is released, and one reel stand is rotated at high speed. By the way, in starting the fast-forwarding or the like, there is no problem even if the rotation of the reel rises slowly. However, when stopping the fast-forwarding magnetic tape, it is desirable to stop the tape instantaneously by the operation.

Therefore, in order to brake the reel base as quickly as possible after the stop operation, the brake device of the conventional magnetic recording / reproducing apparatus is constructed as described with reference to FIGS. 7 to 10. The points of this conventional technique can be explained as follows. That is, the reel stand 21,
Brake arms 9 and 10 each having a brake shoe that is pressed against the peripheral surface of 22 by the urging of a first spring 11, a brake lever 8 that is moved according to the rotation of a drive motor 1 as a drive means, and A slider (13) having an engaging portion (12) which can be engaged with the brake lever (8) and which is moved by the movement of the brake lever (8) against the second spring (15); When the brake shoe is moved against the first spring 11 to stop the fast-forwarding magnetic tape, the stop operation releases the engagement between the engaging portion and the brake lever 8. By the slider 1
3 is moved by the second spring 15, and the brake shoe is biased by the first spring 11 so that the reel stand 2
The reel bases 21 and 22 are braked by being brought into pressure contact with the reels 1 and 22. With this configuration, after the engagement is released,
The reel bases 21 and 22 are instantly braked.

The embodiment of the present invention can be described as follows in a form corresponding to this. That is, brake arms 9 and 10 having brake shoes pressed against the peripheral surfaces of the reel stands 21 and 22 by the bias of the spring 11, and a brake lever 31 that is moved according to the rotation of the drive motor 1 as the drive means. And a contact portion provided on the brake arm 10 and formed of a trigger 32, the movement of the brake lever 31 causes the brake arm 1 to move.
By pressing 0, the brake arm 10 is moved against the spring 11, and when the pressing is released, the contact portion is in a fixed relationship with the chassis 20 and is fixed by the shaft 2a. Abutting on the reel part 2
The state where the braking of 1 and 22 is released is maintained, the magnetic tape is fast-forwarded, and the operation of stopping this magnetic tape releases the contact between the contact portion and the fixed portion, and the brake shoe has By the bias of the spring 11, the reel bases 21 and 22 are instantaneously brought into contact with the peripheral surfaces thereof, and the reel bases are braked.

Comparing the conventional one grasped as described above and this embodiment, there are the following differences in the number of parts. The slider 13 that is conventionally used is no longer required in the embodiment, and the two springs that are conventionally used are now one in the embodiment, and the fixing portion, which is not necessary in the past, is necessary in the embodiment. become. However, by using the shaft 2a as the fixed portion of,
Since it does not increase the number of parts, as described above,
The number of parts in the embodiment is reduced. Further, in this embodiment, since the slider 13 biased by the second spring 15 is not required, the stopper 20f and the cushioning material 14 are unnecessary.

Further, comparing the conventional one grasped as described above and this embodiment, "engagement" is used in the conventional one, and "contact" is used in the embodiment of the present invention. The points are different. It cannot be said unconditionally which structure is simple, the structure for this engagement and the structure for releasing it, and the structure for the contact and the structure for releasing it. "Release" by reverse rotation of motor 1
If so, the configuration in the case of "abutting" becomes simpler as described below.

That is, in this embodiment, the drive motor 1 in a fixed relationship with the chassis 20 is rotated by the drive motor 1 as a structure related to the "contact" and the "release". To be able to contact the peripheral surface of the shaft 2a,
A trigger 32 that is rotatably attached to the brake arm 10, has its rotation position determined in one rotation direction with respect to the brake arm, and is biased to be positioned at this rotation position. When the magnetic tape is fast-forwarded, the trigger 32 is brought into contact with the peripheral surface of the shaft 2a, and the trigger receives a force in the direction in which the rotational position is determined, and the contact state is maintained. Then, when the braking of the reel bases 21 and 22 is released and the rotation direction of the drive motor 1 is reversed as described above, the trigger 32 is rotated against the above-mentioned urging, and the contact is made. It is configured to come off.

On the other hand, in the above-mentioned conventional one,
As a configuration related to the “engagement” and the “release”, the drive motor 1 that is in a fixed relationship with the chassis 20 and the trigger 12 that is engageable with the brake lever 8 are:
The slider 13 is rotatably attached to the slider 13, and its rotation position is defined in one rotation direction with respect to the slider 13, and the trigger 12 is biased to this rotation position. Further, a blade 4 forming a one-way mechanism is attached to the output shaft of the drive motor 1. When the magnetic tape is fast-forwarded, the brake lever 8 and the slider 13 are engaged with each other via the engaging portion, and the blades 4 are not rotated via the torsion spring 3 that constitutes the one-way mechanism. This engagement state is maintained, and the braking of the reel base is released as described above. When the rotation direction of the drive motor 1 is reversed, the blade 4 rotates, and the trigger 12 is kicked by the blade 4 and rotated,
The engagement is configured to be disengaged.

Therefore, in the embodiment of the present invention,
At least the conventional "one-way mechanism including blades" is unnecessary, and the number of parts is reduced accordingly. In the above description, the resin spring portion 32a is formed integrally with the trigger 32, but instead of the resin spring portion 32a,
The trigger 32 may be biased by a separate metallic coil spring or the like.

[0037]

Since the present invention is configured as described above, drive control of the brake arm for braking or releasing the reel base can be realized with a small number of parts, and the structure is simple and the assembly is easy. is there. Therefore, a significant cost reduction can be achieved. Furthermore, since there is no member that generates an impact sound, it is possible to provide a brake device for a magnetic recording / reproducing apparatus that does not generate an offensive impact sound.

[Brief description of drawings]

FIG. 1 is a schematic plan view showing a reset mode (first brake released state) according to an embodiment of the present invention.

FIG. 2 shows an embodiment of the present invention, and FF
It is a schematic plan view which shows / REWIND mode (2nd brake release state).

FIG. 3 shows an embodiment of the present invention, and FF
FIG. 6 is a schematic plan view showing a state (brake state) in which the drive motor reversely rotates from the / REWIND mode and the trigger is released.

FIG. 4 is a schematic enlarged vertical sectional view of an essential part showing a reset mode (first brake released state) according to the embodiment of the present invention.

FIG. 5 shows an embodiment of the present invention, and FF
FIG. 6 is a schematic enlarged vertical cross-sectional view of a main part showing a / REWIND mode (second brake release state).

FIG. 6 is a view showing an embodiment of the present invention, and FF
FIG. 6 is a schematic enlarged vertical cross-sectional view of a main part showing a state (brake state) in which a drive motor reverses from / REWIND mode and a trigger is released.

FIG. 7 shows a conventional example, FF / REWIND
It is a schematic plan view showing a mode (brake release state).
It is.

FIG. 8 shows a conventional example, FF / REWIND
FIG. 7 is a schematic plan view showing a state in which the drive motor is reversed from the mode and the trigger is kicked.

FIG. 9 shows a conventional example and is a schematic plan view showing a reset mode (brake state).

10 is a schematic enlarged perspective view in which a part of the brake device shown in FIG. 7 is disassembled.

[Explanation of symbols]

 1 Drive Motor 2 Worm Gear 2a Shaft 3 Torsion Spring 4 Blades 5 Thrust Receiver 6 Reduction Gear 6a Gear 6b Worm Wheel 7 Main Cam Gear 7a Cam Groove 8 Brake Lever 8a Pin 8b Projection 8c Hole 9 and 10 Brake Arm 9a Projection 9b Cam 10a protrusion 10b shaft 10c pin 11 spring 12 trigger 12a protrusion 13 slider 13a shaft 13b elongated hole 13c cam 13d stopper 14 cushioning material 15,16 spring 20 chassis 20a to 20e shaft 20f stopper 20g guide pin 20h reel 21, 22 Platform 30 Main cam gear 30a Cam groove 31 Brake lever 31a Pin 31b Cam part 32 Trigger 32a Resin spring part 32b Stopper part 32c End part 32d Bearing part

Claims (10)

[Claims] 1. A braking device for a magnetic recording / reproducing apparatus, comprising a brake arm for braking a reel stand for running a magnetic tape, wherein the braking device is rotatable about an axis provided on a chassis forming a main body of the magnetic recording / reproducing apparatus. A brake lever provided to selectively actuate the brake arm in a rotation direction in which the reel base is braked and in a rotation direction in which the reel base is not braked; a drive body that drives the brake lever; However, holding means for holding the brake arm so as not to brake the reel base even when the brake arm is actuated in a rotating direction for braking the reel base, and holding of the brake arm by the holding means is released. And a holding release means for operating the magnetic recording and reproducing apparatus. 2. The brake lever and the brake arm are connected by engaging a protrusion provided on the brake arm with a cam provided on the brake lever. Brake device for magnetic recording / reproducing device. 3. The driving body for driving the brake lever includes a main cam gear having a cam groove, and the brake lever has a pin that engages with the cam groove of the main cam gear. A brake device for a magnetic recording / reproducing device as described in 1 or 2. 4. The magnetic recording according to claim 1, 2 or 3, wherein the holding means is rotatably provided on a shaft integrally formed with one of the brake arms. Brake device for playback device. 5. The brake device for a magnetic recording / reproducing apparatus according to claim 4, wherein the holding means is locked to the brake arm by an elastic member. 6. The brake device for a magnetic recording / reproducing apparatus according to claim 5, wherein the elastic member is a resin spring integrally formed with the holding means. 7. The holding release means is composed of a drive motor and a shaft integrally rotated by the drive motor, and when the brake lever operates the brake arm in a rotating direction for braking the reel base. The holding means comes into contact with the shaft, the brake arm holds the reel base so as not to brake, and the holding means comes into contact with the shaft only when the drive motor rotates in a predetermined direction. The brake device for a magnetic recording / reproducing apparatus according to any one of claims 1, 2, 3, 4, 5, or 6, which is solved. 8. The brake device for a magnetic recording / reproducing apparatus according to claim 7, further comprising a rotational force transmitting means for transmitting the rotational force of the drive motor to the driving body of the brake lever. 9. A brake shoe which is pressed against the peripheral surface of the reel stand by spring bias, a brake lever which is rotated according to the rotation of a motor as a driving means, and a brake arm which is provided with the brake shoe. By contacting the brake arm by rotating the brake lever, the brake arm is moved against the spring, and when the pressing is released, the contact part is released. The state in which the reel base is kept released by being brought into contact with the fixed portion that is in a substantially fixed relationship with the chassis, and the magnetic tape can be fast forwarded in this state, and the operation of stopping the magnetic tape can be performed. The contact between the contact portion and the fixed portion is released, and the brake shoe is instantaneously brought into contact with the peripheral surface of the reel base by the above-mentioned spring bias, and the reel base is restrained. A brake device for a magnetic recording / reproducing apparatus, which is configured to be moved. 10. The motor fixedly connected to the chassis, and rotatably attached to the brake arm so as to come into contact with a peripheral surface of a shaft which is rotated by the motor and acts as the fixed portion. A rotation position is defined in one rotation direction with respect to the brake arm, and the trigger acts as the contact portion and is biased to be positioned at this rotation position. In the case of fast-forwarding, etc., the trigger is brought into contact with the peripheral surface of the shaft, and the trigger receives a force in the direction in which the rotational position is determined, and this contact state is maintained.
As described above, when the braking of the reel base is released and the rotation direction of the motor is reversed, the trigger is rotated against the bias and the contact is released. The brake device of the magnetic recording / reproducing apparatus according to claim 9.