JPS62124648A - Brake device for tape recorder - Google Patents

Abstract

PURPOSE:To secure a large brake ratio with a low brake force by turning a brake arm toward one of a pair of reel stands through a locking arm turning together with a transmission arm and selectively braking a supply side. CONSTITUTION:When a drive gear 6 is turned clockwise, a transmission gear 9 is turned counterclockwise, and the transmission arm 7 and the rocking arm 8 are turned toward the reel stand at the right side. Then the transmission gear 9 engages with the gear part 3 on the reel stand 1 at the right side to transmit the turning of the drive gear 6, and the reel stand 1 at the right side turns toward a tape winding direction. Accordingly the reel stand 2 at the left side turns toward the tape supply direction through a cassette tape if it is loaded. The brake arm 17 turns counterclockwise, reverse to the locking arm 8, and a brake gear 19 engages with the gear part 3 of the reel stand 2 at the left side. Simultaneously, since a brake gear 20 is kept away from the gear 3 of the reel stand 1 at the right side, the reel stand 2 at the left side is braked, and back tension is given to a tape during traveling, whereby excessive tensile force is not given to the tape.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a braking device for a tape recorder, and in particular brakes a reel stand on the tape supply side, applies pack tension to a running tape, and This relates to something that prevents the tape from loosening when the tape is stopped.

[Conventional technology]

The functions required of the running system of a tape recorder include applying pack tension to the tape while it is running, and stopping the tape from high-speed running during fast-forwarding and rewinding, or from constant-speed running during playback. J: Sometimes the tape doesn't come loose when I put it on.

Therefore, in conventional cassette-type cheap reloaders, back tension is applied to the tape by braking the reel stand on the supply side, and when stopping the tape, a solenoid is applied to the reel stands on both the supply side and the take-up side. By press-contacting each brake shoe and giving directionality to the braking force of each brake shoe, a relatively strong braking force is applied to the same reel stand against rotation in the tape supply direction. At the same time, a relatively weak braking force is applied to rotation in the tape winding direction.
The directionality of this brake prevents the tape from loosening when the tape is stopped.

In addition, in order to obtain the directionality of the brake (1), the direction of pressure contact of the brake shoe is shifted from the center of the reel stand, and by this, the angle between the direction of pressure contact of the brake shoe and the tangent to the reel stand in the direction of rotation of the reel stand is determined. Difference in rotation direction of the table IJ'<? In other words, it is formed to have an acute angle or an obtuse angle depending on the supply direction and the winding direction, and when the angle is acute, the brake shoe tries to bite into the reel base when the reel base rotates, which is used to cover the reel base. Strongly brakes rotation in the direction,
In the case of an obtuse angle, the rotation of the reel stand is weakly braked by taking advantage of the fact that the rebrake shoe is repelled by the reel stand and scrapes.

[Problems that the invention attempts to solve]

By the way, among brake devices for the purpose of preventing the tape from loosening when the tape is stopped, the ratio of the braking force applied to the reel stand on the supply side and the braking force applied to the reel stand on the winding side is 71.
However, if the brake ratio is not large to a certain extent, tape loosening cannot be reliably prevented, but if the above-mentioned brake shoes are used, the unevenness of the braking force of both brake shoes -f1 or the outer circumference of the reel stand Because of the non-uniformity of the coefficient of friction between The power becomes quite large, and on top of that, the reel stand on the supply side also has a braking force for the purpose of pack tension, so there is a problem that excessive tension is applied to the tape. Since it is biting into the reel stand on the supply side, there is also the problem that the braking force on the reel stand on the supply side is unstable. This has been an obstacle when used in tape recorders that require precision.

The present invention has been made in view of these points, and is intended to ensure a large brake ratio with stable and weak braking force.

[Means for solving problems]

A braking device for a tape recorder according to the present invention includes a drive wheel, such as a drive gear 6, provided between a pair of reel stands 1.2, a transmission arm 7 coaxially with the drive wheel, and a transmission arm 7 disposed coaxially with the drive wheel.
A transmission wheel, such as a transmission gear 9, which engages with a drive wheel is pivotally supported, and when the rotation of the drive wheel rotates the transmission wheel, the transmission arm 7 is also rotated. In a tape recorder that engages with one of a pair of reel stands 1.2 to rotate the reel stands 1, 2 in the tape winding direction, a braking arm 17.17a is provided between the pair of reel stands 1, 2. A brake wheel, such as a brake gear 19.20, is pivotally supported on the brake arms 17, 17a, and a swing arm 8 that engages with the brake arm 17.17a is coaxial with the drive wheel and transmission arm 7. The swing arm 8 is rotated by the rotation of the drive wheel, and the brake arm 17° 17a is rotated by the rotation of the swing arm 8.
7. The rotation of 17a causes the brake wheel to move between the pair of reel stands 1 and 2.
, and brakes the reel stands 1 and 2 on the tape supply side.

[Effect]

The braking device for a cheap reloader according to the present invention is configured such that the transmission arm 7, which pivotally supports the transmission wheels such as the transmission gear 6, is connected to one of the pair of reel stands 1.2 by switching the direction of rotation of the driving wheels such as the driving gear 6. The braking gear 19. The braking arm \17.17a, which has a brake wheel such as No. 20 pivotally supported, is rotated by the other of the pair of reel stands 1 and 2 to selectively brake the feed side of the reel stands 1°2. be.

〔Example〕

Embodiments of the braking device for a 7-previous vehicle according to the present invention will be described with reference to the drawings.

1 and 2 show a first embodiment.

In FIGS. 1 and 2, 1 and 2 are reel stands, and a gear part 3 is provided on the outer periphery of the pair of reel stands 1 and 2.
Although not shown, a reel shaft is provided on each reel stand 1, 2 via a friction clutch mechanism, and each reel shaft engages with a reel provided in a cassette half of a cassette tape. . In addition, the king indicates the running part of the tape.

A forward/reverse drive motor 4 is disposed in the lower part between each reel stand 1 and 2, and a drive gear 6 as a drive wheel is connected to an output shaft 5 projecting from the motor 4 between the reel stands 1 and 2. 'k
A transmission arm 7 and a swing arm 8 are supported to be slidable only in the 7'J direction, and a transmission arm 7 and a swing arm 8 are respectively supported to be slidable and rotatable in the axial direction on the output shaft 5 with the drive gear 6 in between. A transmission gear 9 serving as a transmission wheel is rotatably supported at the upper part of the end of the side transmission arm 7, and an engagement pin 10 is implanted at the lower part of the end of the upper swinging arm 8.
The transmission gear 9 is meshed with the drive gear 6.

Fells 1 to 11 and 12 for frictional engagement are provided between the transmission arm 7 and the drive gear 6 and between the swing arm 8 and the drive gear 6, respectively, and the lower side of the transmission arm 7 and the Springs 13 and 14 for crimping are respectively installed on the upper side of the swing arm 8, and these are connected to the stop ring 1 fixed to the output shaft 4 on the lower side of the spring 13.
5 and a crimp adjustment nut 16 screwed onto the output @4 above the spring 14, and the transmission arm 7 and the sliding arm 8 are connected to the drive gear 176 via the felt 1-11.12.
The transmission arm 7 and the swing arm 8 are frictionally engaged with each other, so that the transmission arm 7 and the swing arm 8 receive the driving force of the drive gear ψ6.

In addition, a Y-shaped brake arm 1 is provided between each reel stand 1 and 2.
The central part of the brake arm 17 is rotatably supported via a shaft 18, and brake gears 19 and 20 as brake wheels are mounted on the two ends of the brake arm 17 below the running of the tape, respectively.
1.22, and is rotatably supported.
An engagement groove 23 is formed at the opposite end, and this engagement groove 23
is engaged with the engagement pin 10 of the swing arm 8.

Note that the engagement groove 23 of this brake arm 17 is connected to the swing arm 8.
It is formed larger than the engaging pin 10 of , and these engage with each other with a certain amount of play.

A braking felt 24 is attached to the lower side of each brake gear 19.20, and a compression spring 25 is attached to the upper side of each brake gear 19.20, and these are connected to the brake arm 17. It is held between crimp adjustment nuts 1 to 26 screwed to the tip of the shaft 21.22, and each brake gear V719.20 is frictionally engaged with the brake arm 17 via the wheels 1 to 24. A braking force is applied to each braking gear 19,20. A braking felt 27 is attached to the lower part of the braking arm 17, and a weak braking force is applied to the braking arm 17 itself.

Next, the operation will be explained in detail.

In FIG. 1, when the drive gear 976 is rotated clockwise by the motor 4, the transmission gear 9 meshed with the drive gear 6 is rotated counterclockwise and frictionally engaged with the drive gear 6. The transmission arm 7 and the swinging arm 8 receive the drive horn of the drive gear 6 and rotate in the clockwise direction, that is, toward the right reel stand 1.

Then, the transmission gear X19 is rotated by the rotation of the transmission arm 7.
It meshes with the gear A7 portion 3 of the right reel stand 1 to transmit rotation of the drive gear 6, and the right reel stand 1 rotates clockwise, that is, in the tape winding direction.

Therefore, when the tape is attached, the rotation of the right reel stand 1 in the winding direction (clockwise) causes the left reel stand 2 to move in the tape supply direction and in the winding direction via the tape (not shown). ).

Further, the brake arm 17 engaged with the swing arm 8 rotates in the counterclockwise direction opposite to the swing arm 8, and the brake gear 19 on the left side meshes with the gear part 3 of the reel stand 2 on the left side. , the braking gear 20 on the right side is held apart from the gear portion 3 of the reel stand 1 on the right side.

For this reason, the reel stand 2 on the left side, which is the tape supply side,
The tape is braked by the braking force of the brake gear 19 which is held in place by the felt 24, and pack tension is applied to the running tape.

Since this back tension is generated by the rotation of the braking gear 719, it becomes a stable value, the tape running speed is stabilized, good playback can be expected, and uneven tape winding can be prevented. There is no need to worry about putting too much tension on the tape.

Note that the swing arm 8 may rotate slightly in the counterclockwise direction due to vibration or eccentricity of the gear portion 3 of the reel stand 1 on the winding side. Since there is play between the engagement bin 10 and the engagement groove 23 of the brake arm 17, the brake arm 17 immediately rotates clockwise and the brake gear 19 is disengaged from the gear portion 3 of the reel stand 2 on the supply side. There is no need to worry, and the shaft support of the brake arm 17 (I
11118), the braking gear 19 is connected to the tape traveling portion T.
The length from the shaft support (shaft 18) of the arm 17 to the outside of the brake gear 19 is the shaft support (shaft 18) of the arm 17.
Since the length from the shaft 18) to the center of the reel stand 2 is set shorter than the length from the shaft 18) to the center of the reel stand 2, the braking gear 19 bites into the reel stand 2 as the reel stand 2 rotates in the supply direction, and the swing arm 8 Even if the biasing force is lost, the engagement between the braking gear 19 and the gear portion 3 of the reel stand 2 on the supply side is maintained, so that back tension can be applied reliably and stably.

Then, when the rotation of the drive gear 6 by the motor 4 is stopped, the transmission gear A79 and the reel stand 1 which was on the right winding side are stopped, and the left side which was rotating through the tape is stopped. Reel stand 2, which was on the supply side, stops, but
In this state, both -12 = reel stands 1.2 are subject to the rotational resistance of the shaft supports of the reel stands 1 and 2, the rotational resistance of the reel in the cassette half, and the reduction of the side edges of the tape and the inside of the cassette half. The reel stand 2, which was the supply side on the left side, receives the braking force of the braking gear 19, so it receives a steady, stable small braking force that combines the sliding resistance with the friction sheet, etc. The braking force that the reel stand 2 on the supply side receives is larger than the braking force that the reel stand 1 on the take-up side receives, so that the tape does not loosen when the tape stops, and moreover, the braking force on the take-up side Reel stand 1
The braking force applied to the supply side reel stand 2 is a stable small value, and the braking force applied to the supply side reel stand 2 can be adjusted by design conditions or the nut 26, and can be set to a stable value from a small value to a large value, so any brake ratio can be set. you can get
Moreover, since the braking force received by the reel stand 1 on the winding side is stable and small, a large braking ratio can be obtained without increasing the braking force of the braking gear 19 too much.
There is no need to worry about excessive tension being applied to the tape even if the brake ratio is set too high.

Note that the braking force of the reel stand 1 on the winding side is a small value (several grams)
/ cm Pi! a), but small A! Cassette 1~
This is a sufficient value.

Also, when stopping the rotation of the drive gear 6 and stopping the running of the tape, the amount of tape wound on the tape reel from the cassette 1 engaged with the reel stand 1 on the right winding side is determined. Since the moment of inertia of the reel stand 1 on the winding side changes, the following three cases can be considered when the reel stand 1 on the winding side and the transmission gear 9 stop.

■ The reel stand 1 stops earlier than the transmission gear 9.

■ The reel stand 1 stops at the same time as the transmission gear V9.

■ The reel stand 1 stops later than the transmission gear 9.

Here, in the cases of ■ and ■, there is no problem at all because the reel stand 1 and the transmission gear 9 stop while remaining in mesh, but in the case of ■, the transmission gear 9 that stopped first is slow. It will be pushed in the direction of separation by the reel stand 1 that is stopped.

Therefore, in case (2), it is possible that the swing arm 8 is slightly rotated in the counterclockwise cutting direction via the transmission arm 7, but in this case, as described above, the swing arm Since there is play between the engagement pin 10 of No. 8 and the engagement groove 23 of the brake arm 17, the brake arm 17 immediately rotates clockwise and the brake gear 19 moves to the gear portion 3 of the reel stand 2 on the supply side.
Moreover, since the brake gear 19 is in the direction of biting into the reel base 2 due to the rotation of the reel base 2 in the supply direction, even if the urging force of the swing arm 8 is lost, the brake gear 19 will not come off. The meshing with the gear 11 portion 3 of the reel stand 2 on the supply side is maintained, so that the braking force of the braking gear 19 can be applied to the reel stand 2 on the supply side to reliably stop this reel stand 2, There is no need to worry about the tape loosening.

In addition, contrary to the above-mentioned operation, the drive gear 6 is driven by the motor 4.
When rotated in the opposite direction, the transmission gear 9 engages with the drive gear 6 and rotates clockwise, and the transmission arm 7 and the swing arm 8, which are frictionally engaged with the drive gear 6, engage the drive gear 6. It rotates counterclockwise, that is, toward the left reel stand 2 in response to the driving force.

By the rotation of the transmission arm 7, the transmission gear 9 meshes with the gear part 3 of the left reel stand 2 and transmits the rotation of the drive gear 6. Rotates in the winding direction.

Therefore, when the cassette 1 to tape are loaded, as the left reel stand 2 rotates in the winding direction (counterclockwise), the right reel stand 1 moves in the tape supply direction (counterclockwise) via the tape (not shown). direction).

Further, the brake arm 17 engaged with the swing arm 8 rotates in a clockwise direction opposite to the swing arm 8, and the brake gear 20 on the right side meshes with the gear part 3 of the reel stand 1 on the right side. The left braking gear 19 is held apart from the gear portion 3 of the left reel stand 2.

For this reason, the reel stand 1 on the right side, which is on the tape supply side,
is braked in response to the brake j of the brake gear 20 applied by the felt 24, and the direction is opposite to the previous operation, so a detailed explanation will be omitted, but as in the previous explanation, Stable back tension is applied to the tape while it is running without applying excessive tension to the tape, and when the tape is stopped, both reels are applied without applying excessive tension to the tape or loosening the tape. 1, 2
The tape can be stopped by braking.

FIG. 3 shows a second embodiment.

Since this second embodiment is basically the same as the first embodiment described above, the same parts will be given the same reference numerals, the explanation will be omitted, and only the parts that are different will be explained. .

In this embodiment, the Y-shaped brake arm 17 of the previous embodiment
Instead, a T-shaped brake arm 17a is used to brake both reel stands 1 and 2 with one brake gear 19, and the base end of the brake arm 17a is It is rotatably supported, and an engagement hole 23a instead of the engagement groove 23 is provided in the middle part, and the engagement pin 10 of the swing arm 8 engages with this engagement hole 23a with a certain amount of play. are combined.

Note that this second embodiment is also the same as the first embodiment.
Although the explanation of the operation will be omitted because it operates uniformly, the feature of this embodiment is that one braking gear 19 can be used for both reel stands 1 and 2.
This is because the braking angle j for both reel stands 1.degree. 2 can be made equal.

〔Effect of the invention〕

As described above, according to the present invention, by switching the rotation direction of the drive wheel, the transmission arm that pivotally supports the transmission wheel is rotated toward one of the pair of reel stands, and one of the reel stands, that is, the winding side is selected. In conjunction with the reel stand drive mechanism, which is driven by In other words, since the supply side is selectively braked, the stable braking force of the brake wheels allows stable back tension to be applied without applying excessive tension to the running tape, and when stopping the tape. The reel stands on both the take-up side and the supply side are affected by the rotational resistance of the shaft support of the reel stand, the rotational resistance of the reel in the cassette half, and the friction between the side edge of the tape and the anti-friction sheet in the cassette half. In addition to receiving a steady, stable, and small braking force including dynamic resistance, the supply side reel base also receives a braking force from easily adjustable and stable braking wheels, so any desired braking ratio can be achieved by the braking wheels. The tape can be stopped reliably without loosening the tape, and a large brake ratio can be obtained without increasing the braking force of the brake wheels. There is no need to worry about applying excessive tension to the tape.

[Brief explanation of drawings]

The figures show an embodiment of the cheap braking device of the present invention, in which FIG. 1 is a plan view of the first embodiment, FIG. 2 is a partially sectional side view, and FIG. FIG. 2 is a plan view of the second embodiment. 1.2...Reel stand, 6...Drive gear as a drive wheel,
7. Transmission arm, 8. Swinging arm, 9. Transmission gear as transmission wheel, 17.17a... Braking arm, 19
．． 20...Brake gear as a brake wheel.

Claims (3)

[Claims] (1) A drive wheel is provided between a pair of reel stands, a transmission arm is provided coaxially with this drive wheel, a transmission wheel that engages with the drive wheel is supported on this transmission arm, and power is transmitted by rotation of the drive wheel. A tape recorder that rotates a wheel and also rotates a transmission arm, and the rotation of the transmission arm engages the transmission wheel with one of a pair of reel stands and rotates the reel stand in the tape winding direction, A brake arm is pivotally supported between the pair of reel stands, a brake wheel is pivotally supported on the brake arm, and a swing arm that engages with the brake arm is provided coaxially with the drive wheel and transmission arm,
The rotation of the drive wheel rotates the swing arm, the rotation of the swing arm rotates the brake arm, and the rotation of the brake arm engages the brake wheel with the other of the pair of reel stands. A braking device for a tape recorder characterized by braking the reel stand on the tape supply side. (2) The braking device for a tape recorder according to claim 1, wherein the braking arm and the swinging arm are engaged with each other with a small amount of play. (3) The above-mentioned brake wheel is arranged on the tape running part side with respect to the shaft support of the brake arm, and the length from the shaft support of the brake arm to the outside of the brake wheel is measured from the shaft support of the brake arm to each of the above. 3. The braking device for a tape recorder according to claim 1, wherein the braking device is set to be shorter than the length to the center of the reel stand.