JPS5827388Y2 - Brake device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a brake device that is most suitable for application to a reel stand brake device in a recording/reproducing device such as a tape recorder.

Conventionally, so-called double-acting brakes have been widely used in the above-mentioned reel stand brake devices, in which a strong braking force is applied to the biting side of the rotation of the reel stand, and a weak braking force is applied to the escape side. .

However, conventional double-acting brakes have a complex structure, a large number of parts, troublesome assembly, and high costs.

The present invention was constructed to correct the above-mentioned defects, and by using a brake member molded from synthetic resin, it can perform the function of a double-acting brake with extremely few components. The purpose of this invention is to provide a brake device in which the directional ratio of braking force can be precisely controlled.

An embodiment in which the present invention is applied to a tape recorder using an L cassette will be described below with reference to the drawings.

First, the reel stand drive mechanism will be explained with reference to FIGS. 1 and 2.

First, a chassis 1 of the tape recorder main body has a substantially vertical shape, and tape running rotating bodies such as a take-up reel stand 2, a supply reel stand 3, and a capstan 4 are attached to the chassis 1.

A button A pinch roller lever 6 to which a pinch roller 5 is pivotally attached, a chief shifter 7, a tension regulator lever 8, a pair of left and right cut-loading pins 9a and 9b, and other necessary components to be described later are attached to the chassis 1. ing.

On the other hand, the L-cassette 11 is installed in the position shown in FIG.
, 3.

After the cassette is installed, the tape shifter 7, tension regulator lever 8, etc. are moved to the positions shown in FIG. 1, and the tape in the L cassette 11 is pulled out to the state shown in FIG. Recording/reproducing head 13 and erasing head 1 attached to chassis 1
4 and other tape guides (not shown).

By pressing the button in this state, the pinch roller 5 is pressed against the capstan 4, and the tape 12 is driven at a constant speed. At the same time, the take-up reel stand 2 is also rotationally driven.
LAY (recording or reproducing) is performed.

In addition, the pinch roller 5 is separated from the capstan 4, and the chief shifter 7 and tension regulator lever 8 are separated from each other.
The take-up reel stand 2 and the supply reel stand 3 are selectively driven to rotate with the reel and the like moved back to their original positions to perform FF (fast forwarding), REW (rewinding), etc. .

However, this reel stand drive mechanism is configured as a so-called two-motor drive system.

First, place the capstan drive motor 1 at a predetermined position on the chassis 1.
6 is attached, and its motor pulley 17 and a flywheel 18 fixed to the capstan 4 are interlocked by a belt 19.

Therefore, the capstan 4 is connected to this capstan drive motor 1.
6, and is configured to be rotationally driven exclusively by.

On the other hand, a drive wheel 21 for the reel stand is arranged at an intermediate position between the two reel stands 2 and 3 and at a position offset downward from these.

The drive wheel 21 is attached to a motor shaft 23 of a reel stand drive motor 22 attached to the chassis 1 through direct connection or the like.

An idler 24 is arranged above the drive wheel 21 and in the middle between both reel stands 2.3.

Note that this idler 24 is switched by an idler switching mechanism described later.

Therefore, both reel stands 2 and 3 are configured to be rotationally driven exclusively by a reel stand drive motor 22, and the driving situation is as follows.

First, the reel stand drive motor 22 is composed of, for example, a DC motor, and is capable of forward rotation and reverse rotation, and is also capable of constant current drive (constant torque drive) and constant voltage drive (constant speed drive). .

Therefore, when the PLAY button (record button or playback button) is first pressed, the motor 22 is driven with a constant current, and the drive wheel 21 is driven to rotate in the direction of arrow a in FIG.

At the same time, the idler 24 is crimped between the drive wheel 21 and the take-up reel stand 2, as shown by the solid line in FIG.
The take-up reel stand 2 is driven with constant torque in the direction of the arrow in FIG.

As a result, the tape 12, which is being driven at a constant speed by the capstan 4, is wound around the winding IJ with constant torque.

Also, when the REW button (rewind button) is pressed, the motor 22
is driven at a constant voltage, and the driving wheel 21 is rotationally driven in the direction of arrow C in FIG.

At the same time, the idler 24 is crimped between the drive wheel 21 and the supply reel stand 3 as shown by the chain line in FIG.
The supply reel stand 3 is driven at a constant speed (but at a high speed) in the direction of arrow d in FIG.

As a result, tape REW is performed.

Furthermore, when the FF button (fast forward button) is pressed, the idler 24
is crimped between the drive wheel 21 and the take-up reel stand 2 as shown by the solid line in FIG. Ru.

Therefore, at this time, the take-up reel stand 2 is driven at a constant speed (but at a high speed) in the direction of the arrow to perform tape REW.

In this reel stand drive mechanism, it is possible to drive the reel stand drive motor 22 at a constant torque during REW, and this configuration allows application to a reverse machine (reciprocating recorder).

According to the reel stand drive mechanism described above, the reel stand drive motor 22 operates the take-up reel stand 2 even during PLAY.
Since it can be rotated with a constant torque, a tension pulley is applied to the capstan driving belt in PLAm, and the take-up reel table 2 is rotated by the pulley.
Parts such as tension pulleys and torque limiters are no longer required, reducing the number of parts and improving reliability.

Next, the idler switching mechanism will be explained with reference to FIGS. 3 to 7.

First, the idler 24 is pivotally mounted to the lower end of a substantially vertical idler lever 26 via an idler shaft 27.

The upper end of the idler lever 26 is pivotally connected to one end of a substantially horizontal idler lever 29 via a pin 28.
The other end of the idler lever 29 is rotatably supported on the chassis 1 via a fulcrum pin 30.

On the other hand, on both left and right sides of the idler 24, a pair of left and right idler switching levers 31, 32, which are approximately L-shaped, are rotatably supported on the chassis 1 via fulcrum pins 33, 34, respectively.

These two idler switching levers 31 and 32 are biased to rotate in the clockwise and counterclockwise directions in FIG. , 39b and stop.

Thus, the tips 31a of both idler switching levers 31, 32.

Buttons 32a are located on the back side of the idler shaft 27 and are close to butt against each other.

A pair of slopes 37 and 38 are formed on the top surfaces of these image leading edges 31a and 32a, each forming a substantially opposite shape.

A rear end portion of the idler shaft 27 is extended to the rear of the eye driver 26, and the rear end portion is connected to the both slopes 3.
It was placed from above between 7.38 and 7.38.

In addition, a brake release plate 4 is provided on the back side of the idler lever 26.
0 is provided vertically.

This brake release plate 40 is attached to the chassis 1 so as to be slidable in the vertical direction, and has both upper and lower ends 40a.

40b is bent forward at a right angle.

Further, a notch 41 is formed in this brake release plate 40, and a protrusion 42 formed on the upper edge of the notch 41.
An idler compression spring 44 made of a compression spring is interposed between the idler lever 29 and a protrusion 43 formed on the tip of the idler lever 29.

Therefore, the idler pressure spring 44 urges the idler lever 26 and the brake release plate 40 downward and upward.

The idler lever 26 is stopped by coming into contact with the slopes 37 and 38 of both idler switching levers 31 and 32 from above via the idler shaft 27, and the brake release plate 40 is stopped by its lower end 40b. The tip portion 31a.

It is configured to abut and stop on the lower surface of 32a.

However, both return springs 35 and 36 are idler compression springs 44.
Constructed with stronger springs.

The leftover brake release plate 40 is associated with a brake mechanism to be described later by its upper end 40a.

The switching of the idler 24 during the above-mentioned FF (PLAY) and REW is performed in the following manner.

First, Fig. 7 shows a state in which the FF state is switched to the FF state (the same applies to CPLAY), but before this switching starts, the FF idler switching lever 31 is in the chain line like the REW idler switching lever 32. It has been moved back to its position.

The idler shaft 27 is held between both slopes 37 and 38 as shown by the chain line, and is positioned on a perpendicular line P passing through the center of the drive wheel 21.

When the FF button is pressed in this state, the drive wheel 21 is rotationally driven in the direction of arrow a, as described above.

At the same time, the FF idler switching lever 31 is rotated counterclockwise to a predetermined angle as shown by the solid line against the return spring 35.

Then, the tip 31a of the idler switching lever 31 pushes the lower end of the brake release plate 40, and the brake release plate 4
Push down 0 as shown by the solid line.

As a result, the idler compression spring 44 is compressed, and the idler lever 29 is rotated counterclockwise by the spring force, and the idler lever 26 is pressed downward.

However, at this time, as the idler switching lever 31 rotates, its slope 37 escapes below the idler shaft 27, so the idler shaft 2T falls below the slope 38 of the idler switching lever 32, and the take-up reel is moved from above the perpendicular line P. It is biased toward the pedestal 2 side.

As a result, the idler 24 is moved diagonally downward to be pressed between the take-up reel stand 2 and the drive wheel 21.

Then, as the rotation angle of the idler switching lever 310 increases, the idler compression spring 14 is further compressed, and the idler 24 is compressed between the take-up reel stand 2 and the drive wheel 21 as shown by the solid line by the spring force.

At this time, the drive wheel 21 is rotating in the direction of the arrow a, and the idler 24 is pressed in the biting direction in response to this rotation, so that the idler 24 is pressed very smoothly and reliably.

Further, when the FF button is unlocked by pressing, for example, the 5TOP button (stop button) in the FF state, the idler switching lever 31 is released and the lever 31 is moved back clockwise by the return spring 35.

At this time, the slope 37 of the lever 31 is aligned with the idler shaft 2.
7 from below and move the idler 24 diagonally upward to separate it from between the take-up reel stand 2 and the drive wheel 21.

The idler shaft 27 is then moved back onto the original perpendicular line P.

At this time, the brake release plate 40 is attached to the idler compression spring 44.
is pushed back upward by the spring force.

When the REW button is pressed, the REW idler switching lever 32 is rotated clockwise to a predetermined angle in FIG. 7 against the return spring 36.

Then, the idler 24 is pressed between the supply reel stand 3 and the drive wheel 21 by the spring force of the idler compression spring 44 in an operation symmetrical to that at the time of FF.

Furthermore, according to the idler switching mechanism described above, the idler 2
The movement from the position above the perpendicular line P of No. 4 to the FF and REW positions is also performed in relation to the rotational force of the drive wheel 21.
Since the idler 24 will never enter the side opposite to the rotational direction of the drive wheel 21, no malfunction will occur.

Also, since the idler 24 is crimped in a specific direction,
The idler 24 is moved to the FF and REW positions by relying only on the rotational force of the drive wheel 21.
Increase the axis loss of 4, and this will help Ichinoji drive motor 2
The load of 2 does not become harsh.

The idler switching levers 31 and 32 are not necessarily of a rotation type, but may be of a type that reciprocates in a straight line, for example, in the left-right direction or in the up-down direction.

Next, the tape winding mechanism at the time of 5TOP (stop) will be explained with reference to FIG.

First, a timing idler 46 is provided between the drive wheel 21 and the take-up reel stand 2 at a position below these.

This timing idler 46 is pivotally connected to an idler lever 4γ, and this idler lever 47 is rotatably supported on the chassis 1 via a fulcrum pin 48 at one end thereof.

The idler lever 47 is biased clockwise by an idler compression spring 49 which is a tension spring.

Then, the tip 47a of the idler lever 47 is extended diagonally upward, and the tip 47a is attached to the brake release plate 4.
0 is located close to the bottom of the lower end 40b.

However, this tape winding mechanism is 5TOP in the PLAY state.
, pinch roller 5, chief shifter 7,
The tension regulator lever 8 etc. are returned to their original positions, and the tape 12 is pulled out of the L cassette 11.
When the tape 12 is stopped in this state, the tape 12 is slightly wound around the take-up reel, the tape 12 is pulled into the L cassette 11, and the tape 12 is tensioned and stopped.

First, as mentioned above, during PLAY, FF, and REW, the brake release plate 40 is pushed down.
Since the lower end 40b abuts the tip 47a of the idler lever 47 from above and pushes it down, the idler lever 47 is rotated counterclockwise as shown by the chain line against the idler compression spring 49.

As a result, the timing idler 46 is connected to the drive wheel 21.
It is spaced apart from between and the take-up reel stand 2 and below them as shown by the chain line.

Therefore, when the PLAY state is switched to 5TOP and the idler 24 is separated upward from between the drive wheel 21 and the take-up reel stand 2 as described above, the brake release plate 40 is accordingly moved upward again. .

Then, the idler lever 47 is rotated clockwise by the idler compression spring 49, and the timing idler 46 is compressed from below between the drive wheel 21 and the take-up reel stand 2 as shown by the solid line.

That is, while the idler 24 is released, the timing idler 46 is pressed.

However, at this time, the reel stand drive motor 22 is
It is configured so that it does not stop at the moment it is switched to the P state, but stops after continuing to rotate for several seconds.

Therefore, from the above moment, the rotational force of the drive wheel 21 is increased by the idler 2.
4, the timing idler 46 takes over and transmits the signal to the take-up reel stand 2, and the take-up reel stand 2 continues to rotate in one direction (in the direction of arrow a) for several seconds thereafter.

At the moment when button 5 is switched to the TOP state, both reel stands 2゜3 are braked by the reel stand brake mechanism that moves backward, but the rotation direction of the take-up reel stand 2 is in the direction of arrow a, and the brakes are not released. direction, the brake is weak, and therefore the take-up reel stand 2 is driven by the reel stand drive motor 2.
It is sufficiently rotated in the direction of arrow a by the torque of No. 2.

As a result of the above, the tape 12 is reliably wound onto the take-up reel, reliably drawn into the L cassette 11, and stopped in a taut state.

When the timing idler 46 is pressed onto the drive wheel 21 as described above, 1. The short drive 21 is rotating in the direction of the arrow a, and the timing idler 46 is pressed in the escape direction in response to this rotation, so the timing idler 46 can be stopped in a state where it bites into the drive wheel 21. Without,
This is advantageous because no side pressure is applied to the reel stand drive motor 22 in the 5TOP state.

Next, the reel stand brake mechanism will be explained with reference to FIG.

First, this reel stand brake mechanism is constructed as a so-called double-acting block brake.

The pair of brake members 51 and 52 are rotatably supported on the chassis 1 via a pair of fulcrum shafts 53 and 54 at the upper positions of both reel stands 2.3.

Both brake members 51, 52 are made of a synthetic resin having appropriate elasticity, such as polycarbonate resin, and have a symmetrical shape.

That is, these two brake members 51 and 52 include a brake piece portion 56 at the tip to which a brake shoe 55 made of felt or the like is fixed by adhesive or mechanical means, a boss portion 57 rotatably attached to a fulcrum shaft, and a boss portion 57 that is rotatably attached to a fulcrum shaft. It consists of a hinge part 58 having an appropriate elastic effect that connects the brake piece part 56 and the boss part 57, and protrusions 59 and 60 connected to the boss part 57, and these parts are molded integrally with each other. It has a similar structure.

Both brake members 51 and 52 are configured to be press-fitted to and separated from the circumferential surfaces of both reel stands 2 and 3, which are braked members, by brake shoes 55, respectively.

These two brake members 51 and 52 are rotated clockwise and counterclockwise about the fulcrum shaft by a limiter 61, which is a spring member made of a tension spring stretched between the two brake pieces 56. A pair of stoppers 62a provided on the chassis 1.

It is configured to stop when the protrusion 59 comes into contact with the protrusion 62b.

Next, the braking action of one brake member 51 on the take-up reel stand 2 will be explained. The direction of the arrow a of the take-up reel stand 2 is the escape direction, and the opposite direction of the arrow d' is the bite direction.

Therefore, when the brake is applied to the relief side, the moment the brake member 51 is pressed against the take-up reel stand 2 by the brake shoe 55, the brake member 51 receives a counterclockwise rotational force.

At this time, the entire brake member 51 rotates slightly counterclockwise as shown by the dotted line, and according to this movement, the limiter spring 61 is stretched against its elasticity.
The amount of force due to the restoring force determines the amount of brake force on the escape side.

However, at this time, since the force of the limiter spring 61 is relatively small, the entire brake member 51 functions almost as a rigid body.

That is, almost no deformation occurs in the bending portion of the hinge portion 58.

Next, when the brake is applied to the biting side, the brake member 51 is about to be rotated clockwise at the moment it is pressed against the take-up reel stand 2 by the brake shoe 56.

However, at this time, the projection 59 comes into contact with the stopper 62a, and the clockwise rotation of the boss 57 is restricted.
Its rotation is suppressed.

When further biting force is applied to the brake member 51,
The hinge portion 58 of the brake member 51 bends as shown by the chain line against its elasticity, deforms and the brake piece portion 56 escapes from the take-up reel stand 2, causing an abnormally strong braking force on the take-up reel stand 2. prevent it from being applied.

That is, the amount of brake force on the biting side is determined by the restoring force based on the elasticity of the hinge portion 58, and it becomes possible to freely determine the brake direction ratio and maximum brake.

The braking action of the other brake member 52 on the supply reel stand 3 is exactly the same as described above, but in the supply reel stand 3, the direction of arrow d is the escape direction, and the direction of arrow d' is the direction of bite.

PLAY, FF, of both brake members 51 and 52 mentioned above.
The release operation during REW is performed by both brake members 51.5.
The protrusions 59 and 60 of both brake members 51 and 52 may be pushed in a predetermined direction, but in this case, the protrusions 59 and 60 of both brake members 51 and 52
is inserted under the upper end 40a of the brake release plate 40.

Then, as described above, when the brake release plate 40 is pushed down by switching to PLAY, FF, and REW, the upper end 40a pushes the side protrusion 59 downward, and both brake members 51 and 52 are released from the limiter spring. 61 in a counterclockwise direction and a clockwise direction at the same time, these brake shoes 55 are separated from both the lever bases 2 and 3, and the brake is released.

According to the above-mentioned reel stand brake mechanism, the brake component parts are There are very few and the structure is very simple.

The shapes of the two brake members 51 and 52, particularly the shape of the hinge portion 58, are not limited to those shown in the drawings, but can be changed to various other effective shapes.

In summary, the brake device of the present invention connects the brake piece at the tip, which is molded from synthetic resin and has a brake shoe, and the boss part, which is rotatably attached to the fulcrum shaft, by means of an elastic hinge part. Using brake members integrally connected to each other, the brake members are urged to rotate in a first direction about the fulcrum shaft by a spring member to press the brake shoe to the braked member, and When the braked member rotates in the escape direction, the entire brake member rotates in the second direction against the elasticity of the spring member, and the restoring force of the spring member causes the braked member to rotate in the second direction. When the brake member rotates in the biting direction, a stopper restricts the rotation of the brake member on the boss side in the first direction. The member is characterized in that the member deforms around the hinge portion against the elasticity of the hinge portion, and a restoring force of the hinge portion applies a braking force to the brake target member. .

Therefore, the present invention has the following advantages.

■ The brake member is molded from synthetic resin and has a structure in which the brake piece part and the boss part are integrally connected to each other by an elastic hinge part. It is configured to restrict the rotation of the brake member on the closed side and utilize the elasticity of the hinge part, and to function as a double-acting brake. It is easy to assemble, has a simple structure, has a small number of parts, and is extremely low cost.

■ Moreover, when the braked member rotates in the escape direction, the restoring force based on the elasticity of the spring member is used, and when the braked member rotates in the biting direction, the restoring force based on the elasticity of the hinge part independently causes the brake to be braked. By adjusting these elasticities in order to apply a braking force to the member, it is easy to set the braking force on the braked member according to the rotational direction, and the direction ratio can also be set freely and precisely.

[Brief Description of the Drawings] The drawings show an embodiment in which the present invention is applied to a tape recorder, in which Fig. 1 is a front view illustrating the reel stand drive mechanism, and Fig. 2 shows the same idler switching. Figure 3 is a front view of main parts to explain the situation, Figure 3 is a front view to explain the idler switching mechanism, Figure 4 is a sectional view taken along the line IV-IV in Figure 3, and Figure 5 is a sectional view taken along the line ■-V in Figure 3. , FIG. 6 is a perspective view of the main parts of the same as above,
FIG. 7 is a front view of the main parts to explain the idler switching operation same as above, FIG. 8 is a front view to explain the tape winding mechanism, and FIG.
The figure is a front view illustrating the brake mechanism. Also, in the symbols used in the drawings, 2 is a take-up reel stand, 3 is a supply reel stand, 51.52 is a brake member, and 53
．． 54 is a fulcrum shaft, 55 is a brake shoe, 56 is a brake piece, 57 is a boss, 58 is a hinge, 59 and 60 are projections, 61 is a limiter spring, and 62a and 62b are stoppers.

Claims (1)

[Scope of utility model registration request] Molded from synthetic resin, the brake piece at the tip with the brake shoe installed and the boss part rotatably attached to the fulcrum shaft are integrally connected to each other by an elastic hinge part. Using a brake member, the brake member is urged to rotate in a first direction about the fulcrum shaft by a spring member to press the brake shoe to the braked member, and the braked member rotates in the escape direction. Sometimes, the entire brake member rotates in a second direction against the elasticity of the spring member, and the restoring force of the spring member applies a braking force to the brake target member. When the braked member rotates in the biting direction, a stopper restricts rotation of the boss portion of the brake member in the first direction, so that the brake member rotates around the hinge portion. A brake device characterized in that the brake device is configured to deform against the elasticity of the hinge portion and apply a braking force to the brake target member by the restoring force of the hinge portion.