JPS6029065Y2 - Brake device in tape recorder - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a brake device for a tape recorder in which two return springs are easily balanced and a reliable braking operation is obtained.

In general, tape recorders have recording playback, fast forwarding,
When switching from a running state such as rewinding to a stop state, a brake device is provided to quickly stop tape running as quickly and reliably as possible to prevent the magnetic tape from sagging.

FIG. 1 shows an example of a conventional brake device of this type.

That is, the brake lever 1 is rotatably supported at one end and connected to the movable iron core 3 of the plunger 2 at the other end, and the brake plate 5 is constantly urged downward in the figure by a brake return spring 4. The plunger 2 is connected by a brake spring 6 having a larger spring force than the brake return spring 4, and when the running state is switched to the stopped state, the plunger 2
The brake plate 5 is actuated by energizing the brake plate 5.

That is, when the plunger 2 is excited by energization, the movable iron core 3 is attracted, so the brake lever 1 is rotated against the brake return spring 4 as shown by the chain line.

At this time, since the brake plate 5 is integrally connected to the brake lever 1 by the brake spring 6, the brake plate 5 moves upward as a unit and both arms are pressed against the surfaces of the supply reel stand 7 and the take-up reel stand 8. By doing so, the rotation of both the roll bases 7 and 8 is prevented.

The plunger 2 has a larger magnetic attraction force and consumes less current as the movable iron core 3 is pulled in more during operation. The movable iron core 3 is continuously attracted and held in the maximum retracted state.

Therefore, the brake spring 6 is tensioned by the pulling component of the movable iron core 3 at this time.

On the other hand, when the stopped state is switched to the running state and the plunger 2 is no longer energized, the upward force on the movable iron core 3 is no longer applied, so the brake lever 1. The brake plate 5 and the movable iron core 3 return to their original positions indicated by solid lines by the force of the brake return spring 4, and the braking state by the brake plate 5 is released.

However, in such a conventional brake device, the brake plate 5 is supported by two springs, namely, the brake return spring 4 for returning the brake plate and returning the movable core, and the brake spring 6 for moving the movable core. Because it uses a floating system, it was difficult to balance the springs during the design stage, making it difficult to obtain good braking action.

This idea was made in view of the above-mentioned circumstances.The brake lever is rotatably supported, and a lever return spring is used to constantly bias it in the direction of releasing the brake, and the operating arm is rotated by a movable iron core. A return spring that serves as a substitute for pulling and returning the movable iron core is used to constantly bias it in the direction of braking action.By the operation of the waist plunger, the actuating arm moves together with the movable iron core, and the brake lever is moved in the direction of braking action. The present invention provides a brake device for a tape recorder that can easily maintain the balance between two springs and obtain good and reliable braking operation using an extremely simple structure of rotation.

Hereinafter, one embodiment of this invention will be described in detail based on the drawings.

Figures 2 to 5 show the brake device according to this invention, with Figure 2 being a front view, Figure 3 being a side view, Figure 4 being a sectional view taken along line I-I in Figure 3, and Figure 5 being a rear view. It is a diagram.

In these figures, 10 is a chassis made of a metal plate disposed inside the tape recorder main body.
A supply reel stand 13 and a take-up reel stand 14 each having a reel shaft 11, 12 are arranged on the front side of the reel.

These reel stands 13 and 14 normally do not receive rotation from a drive motor (not shown) in a non-running state, and when switching to a running state such as recording/playback or fast-forwarding, the brakes of the brake device 15 (to be described later) are released at the same time. Rotation is selectively transmitted by switching a conventionally known operation switching mechanism (not shown), and during recording/playback and fast-forwarding operations, the supply reel stand 13 remains in an idle state, and the take-up reel stand 13 remains in an idle state. 14 is rotated in the direction of arrow A in FIG.
On the contrary, during the rewinding operation, the supply reel stand 13 is rotated in the direction of arrow B, and the take-up reel stand 14 is configured to maintain an idle state.

The brake device 15 includes a plunger 17 that is fixed to the back surface of the chassis 10 and includes a conventionally known coil (not shown) and a movable iron core 16.

When the plunger 17 is switched from the running state to the stopped state, the coil is energized and excited to pull the movable iron core 16 downward against the return spring 18, thereby switching from the stopped state to the running state. The configuration is such that the supply of current to the coil is stopped when the coil is turned on.

A slit 19 is formed in the upper end surface of the movable iron core 16, and is rotatably supported by the slit 19 via a pin 20, and the return spring 18 is locked to one end of the slit 19, so that the third In the figure, the actuating arm 2 is given a rotational habit in the clockwise direction, that is, in the brake application direction.
1 is provided.

The other end of the operating arm 21 extends in the direction of the chassis 10, and its tip forms a pressing piece 21a that simultaneously presses a pair of brake levers, which will be described later, when the driving state is switched from the running state to the stopped state. A detent portion 21b is integrally provided at the lower end of the actuating arm 21 and prevents the actuating arm 21 from rotating in the brake application direction by a predetermined angle or more by coming into contact with the bottom surface of the slit 19.

One end of the return spring 18 is locked to the upper end of a plate 22 fixed to the back surface of the plunger 17.

A stopper piece 23 for regulating the upward movement of the movable iron core 16 is integrally provided on the plate 22, and a rubber 24 for buffering and noise prevention is fitted and fixed to the tip of the stopper piece 23.

A pair of brake levers 25 and 26 made of thermoplastic resin are mounted on the chassis 10 and are connected to the plunger 17.
It is arranged so that it can rotate freely between the two.

These brake levers 25, 26 and the chassis 10
are integrally formed by the conventionally well-known outsert molding method, so the rotating shaft portions 27, 28 provided on the brake lever 25, 26 are integrally manufactured.

In this case, the flake reppers 25 and 26 rotate smoothly because there is little friction between the rotating shafts 27 and 28 and the bearing holes due to contraction of the resin after molding.

A pair of brake bars 25.2 thus formed
6 is a brake arm 25a that is located on the front side of the chassis 10 continuously from one end of the rotating shaft portion 27, 28, and whose tips extend to the sides of the supply reel stand 13 and the take-up reel stand 14, respectively. , 26a, and the rotating shaft portion 27.2.
8 and located on the back side of the chassis 10,
The tips thereof are the pressing pieces 21a of the actuating arm 21, respectively.
It is integrally provided with arms 25b and 26b extending downward.

These brake levers 25 and 26 have a coil portion formed in the center that is constantly rotated in the brake release direction by a lever return spring 30 supported by a pin 29 implanted on the back surface of the chassis 10. Granted.

In this case, the brake bar 25 is given a counterclockwise rotational habit in FIG. 2 by one end of the brake return spring 30 pressing the lever 25b upward, and the brake lever 26 is rotated by the brake return spring 30. The other end presses the lever 26b upward, thereby imparting a clockwise rotational habit.

Arms 25a, 26b of the brake levers 25, 26
At the tip of the supply reel stand 13 and take-up reel stand 14
Brake shoes 31 and 32 made of leather, rubber, etc. are fixed to the surfaces facing the circumferential surfaces of the reel stands 13 and 32, respectively, and these brake shoes 31 and 32 are fixed to the surfaces facing the circumferential surfaces of the reel stands 13 and 32, respectively.
4, and are crimped onto the circumferential surfaces of the respective parts.

Note that the spring force of the lever return spring 30 is equal to that of the return spring 1.
It is set somewhat weaker than that of 8.

Next, the operation of the brake device having the above configuration will be explained.

In the non-travel state shown in the figure, the plunger 17 is in an excited state due to current being supplied to the coil, so the movable iron core 16
is sucked downward against the return spring 18, thereby causing the pressing piece 21a of the actuating arm 21 to press the brake lever 25.
26 arms 25b, 26b are pressed down against the lever return spring 30.

For this reason, the brake arm 26 is rotated in the brake application direction, and the brake shoes 31, 32 are pressed against the circumferential surfaces of the supply reel stand 13 and the take-up reel stand 14, and both reel stands 13, 14 are rotated. It prevents the rotation of.

When the state is switched from this state to the running state, the plunger 17 is deenergized and demagnetized, so the movable core 16 moves upward by the force of the return spring 18 and comes into contact with the rubber 24 as shown in FIG. It is locked.

At this time, the actuating arm 21 also moves upward together with the movable iron core 16, and the arms 25b, 25 of the brake bars 25, 26
b, the brake levers 25 and 26 are rotated in the brake release direction by the force of the lever return spring 30, thereby releasing the brake state of the supply reel stand 13 and the take-up reel stand 14.

The take-up reel stand 14, to which the rotation from the drive motor is transmitted, rotates in the direction of arrow A, and winds up the magnetic tape unwound from the supply reel stand 13 side.

When the state is changed from the running state to the stopped state, the plunger 17 is energized again and pulls in the movable core 16, so the actuating arm 20 lowers together with the movable core 16, and at the same time is pulled by the return spring 18 so that it is centered around the pin 20. As shown in FIG. 3, the pressing piece 21a rotates clockwise as shown in FIG.
Press down the levers 25b and 26b of the brake levers 25 and 26.

Therefore, the brake levers 25, 26 are rotated in the braking direction against the lever return spring 30, and set to the above-mentioned braking state.

On the other hand, since the movable iron core 16 is retracted even after the brake levers 25 and 26 are set to the braking state, the amount of retraction is ensured by the extension of the return spring 18.

FIG. 7 is a schematic diagram showing the basic configuration of the brake device.

That is, the brake lever 25 is separated from the movable iron core 16 of the plunger 17 and rotatably supported at its intermediate portion, with one end extending to the side of a reel stand (not shown), and the other end extending in the vicinity of the plunger 17. and is constantly biased in the brake release direction by a lever return spring 30.

On the other hand, the movable iron core 16 is provided with an operating arm 21 rotatably supported at an intermediate portion thereof.

This operating arm 21 has a return spring 1 locked at one end thereof.
8 gives a habit of constantly rotating in the brake application direction, so that when the running state is switched to the stopped state, the movable iron core 16 rotates as the movable iron core 16 is sucked down and the other end of the brake lever 25 is returned to its original position. Press against the spring 30,
This causes the brake lever 25 to rotate in the direction of applying the brake.

For this reason, the spring force of the return spring 18 is set to be greater than that of the lever return spring 30.

Further, the return spring 18 is configured to prevent the movable iron core 1 from being sucked down even after the brake lever 25 is set to the braking state.
6. It is used as a pulling spring and as a return spring during the play operation.

Thus, according to such a configuration, the brake lever 25
．． 26 and the actuating arm 21 are biased independently by the lever return spring 30 and the return spring 18, so compared to the conventional neutral floating system described above, the balance of the springs can be easily maintained, which is good and reliable. It is possible to obtain accurate braking action.

As explained above, according to the brake device for the tape recorder according to this invention, the brake lever and the actuating arm are independently biased by a spring for lever return and a spring for pulling and movable core return. Therefore, compared to the conventional neutral floating method, the spring setting is easier and more reliable braking operation can be obtained, and the effect is excellent.

[Brief explanation of the drawing]

Figure 1 is a front view showing an example of a conventional brake device; Figure 2 is a front view showing an example of a conventional brake device;
The figure is a front view showing one embodiment of the brake device, Figure 3 is a side view thereof, Figure 4 is a sectional view taken along the line I-I in Figure 3, Figure 5 is a rear view, and Figure 6 is an explanatory diagram of the operation. , Figure 7 is the same as Figures 2 to 6.
FIG. 2 is a basic configuration diagram of a brake device in the tape recorder shown in the figure. 10... Chassis, 13... Supply reel, 14... Take-up reel, 15... Brake device, 16... Movable iron core, 17...
...Plunger, 18...Return spring, 21...
...Actuation arm, 21b... Rotating part,
25, 26... Brake lever 30...
...Lever return spring.

Claims (2)

[Scope of utility model registration request] (1) A plunger that is energized in a non-running state and attracts a movable iron core, and a plunger that is rotatably supported, one end of which extends to the side of the reel stand, and the other end of which can be crimped onto the circumferential surface of the plunger. a brake lever that extends to the position and is always given the habit of rotating in the brake release direction by a lever return spring; an actuation arm whose intermediate portion is rotatably supported by the movable iron core; and the actuation arm. a return spring that is locked at one end and constantly biases the operating arm in the brake application direction and simultaneously biases the movable iron core in the return direction; The lever is pressed by the operating arm that moves together with the movable iron core that is attracted by the lever, and rotates against the lever return spring, so that one end of the arm is pressed against the circumferential surface of the reel stand and prevents the rotation of the reel stand. 1. A brake device for a tape recorder, characterized in that when the actuating arm is released during traveling operation, the reel stand is rotated in the brake release direction by the force of a lever return spring, thereby releasing the brake state of the reel stand. (2) Utility model registration claim 1, characterized in that the actuating arm is integrally provided with a rotation stopper that prevents the actuating arm from rotating beyond a certain angle in the brake application direction. Brake device in the tape recorder described.