JPH0543336U - Brake mechanism - Google Patents

Abstract

(57) [Abstract] [Purpose] The present invention makes it possible to easily switch the brake mechanism by integrating the back tension brake mechanism and the soft brake mechanism. According to the present invention, a back tension lever 5 for pulling out a tape and giving a constant tension, and a brake shoe 12b of a pair of brake levers 12 which is pressed and integrated with a supply rule as the back tension lever 5 rotates,
With 12e, the braking of the supply reel 2 is switched to appropriately apply tension to the tape.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a brake mechanism for a reel stand of a video tape recorder or the like.

[0002]

[Prior Art]

 FIG. 3 shows a schematic diagram of the mechanism of a conventional tape recorder. Reference numeral 1 is a reel chassis on which the respective parts are mounted, 2 is a supply reel base, 3 is a take-up reel base, and 4 is an idler gear for switching the drive.

Reference numeral 5 engages with a back tension pin 5a for pulling out a tape (not shown), a central shaft 5b for rotating the tape when pulling out the tape, and one end of an urging means for urging the tape to rotate counterclockwise. The back tension lever comprises a pin 5c and a pushing piece 5d for urging a braking means for braking the supply reel base 2.

Reference numeral 6 denotes a spring as an urging means for urging the back tension lever 5 to rotate in a counterclockwise direction. It is a back tension brake lever which is a braking means for rotating the supply reel base 2 by an integrally formed brake shoe 7b.

Reference numeral 8 is a spring that biases the back tension brake lever in a counterclockwise direction about the central shaft 7 d and fixes one of the springs to the back tension lever 7. A fixing member 9 fixes the other end 6b of the spring 6 to one end and the end of the spring 8 to the other end. Reference numeral 10 is a soft brake lever that applies a light braking force to the supply reel base 2 by the break 10a at the movable end 10b, and 11 is a control means for controlling the rotation of the soft brake lever.

The operation will be described with reference to the drawings. First, when the tape is in the tape cassette, the supply reel base 2 is soft braked by the control means 11. Then, when the tape is loaded, the back tension lever 5 rotates counterclockwise about the central axis 5d by the spring 6, and the tape is pulled out by the back tension pin 5a.

Upon completion of loading, the back tension lever 5 is positioned as shown in FIG. 3, and the back tension brake lever 7 is rotated clockwise by the pushing piece 5d to brake the supply reel base 2. At the same time, the control means 11 works so as to release the soft brake.

Then, the recording / playback mode is set, and a recording operation or a playback operation is performed. If a strong tension is applied to the tape for some reason during this recording / playback, the back tension lever 5 is rotated clockwise by the force of the tape, and the back tension breaker lever 7 applies the pressing force to the supply reel base 2. Instantly release the strong tension applied to the weakening tape, and return to normal tension.

Next, during operations other than recording / playback operations such as stop operation, rewind operation, and fast forward operation, the back tension lever 5 is slightly returned in the clockwise direction by the spring 9, and the back tension brake lever 7 is moved. At the same time as being separated from the supply reel base 2, the control means 11 operates so that the soft brake contacts the supply reel base 2.

At the time of unloading, the back tension lever 5 rotates in reverse to the loading, and the tape is taken into the tape case, and at the same time, the soft brake is applied.

Therefore, it is possible to perform braking of the reel required as the tape is driven.

[0012]

[Problems to be solved by the device]

 However, in the above configuration, two types of brake mechanisms, which are a back tension brake mechanism and a soft brake mechanism, are required separately, and it is difficult to control the timing of each brake mechanism.

In order to solve the above problems, the present invention integrates a back tension brake mechanism and a soft brake mechanism so that the brake mechanism can be easily switched.

Further, the number of parts is reduced, and an inexpensive brake mechanism is provided.

[0015]

[Means for Solving the Problems]

 According to the present invention, a tape is pulled out from a tape cassette, an arm that applies an appropriate tension to the tape and a first braking that engages with the arm during recording and reproducing and applies an appropriate braking force to the supply reel base by the operation of the arm. A brake mechanism comprising a lever and a second brake lever which is integrally formed with the first brake lever and applies a light braking force to the supply reel base when the first brake lever is not engaged with the arm. It is provided.

[0016]

[Action]

 The invention is that the arm of the tension lever presses the brake lever to brake the supply rule during recording or playback, and the brake of the break lever is released by the tension lever except during recording / playback, and the soft brake lever is supplied by the spring. Braking the reel stand.

[0017]

【Example】

 FIG. 1 shows a schematic diagram of the mechanism of the tape recorder of the present invention. The same parts as those of the conventional example are designated by the same reference numerals and the description thereof will be omitted.

Reference numeral 12 is a brake lever pair in which a back tension brake lever and a soft brake lever are integrally formed, and a spring 7 is wound around a central shaft 12d so as to urge it to rotate counterclockwise.

The brake lever pair 12 has a first movable piece 12c having a brake 12b for braking the back tension brake lever, and a second movable piece 12b having a brake shoe 12e for controlling the soft brake lever. 12f and one end 12c which is urged to rotate in the clockwise direction by the pushing piece 5d of the back tension lever 5.

Needless to say, the first movable piece 12c and the second movable piece 12f, which are integrally formed, are also rotationally biased when the above-mentioned rotational biasing is performed.

FIG. 2 shows an essential part of the brake mechanism. The figure a shows the state in the recording or reproducing mode, and the figure b shows the state in the mode other than the loading, unloading or recording / reproducing mode.

The operation will be described with reference to the drawings.

First, when the tape case is mounted, the back tension lever 5 is rotated in the direction A, which is the counterclockwise direction in FIG. 2B, and the tape is pulled out. Then, it stops in the state of FIG. 2a and waits for the next operation. At this time, the back tension lever 5 is not in contact with the brake lever pair 7, and the brake 12e of the soft brake lever is in contact with the supply reel base 2 for braking.

Next, when a reproduction or recording operation is performed, the back tension lever 5 is further rotated in the same direction, and the state shown in FIG. 2a is obtained. At this time, the pushing piece 5d of the back tension lever 5 pushes the one end 7a of the brake lever pair 7, whereby the brake lever pair 7 is rotated clockwise. As a result, the brake 12e that has been braking in the above state releases the braking, and instead, the brake 7b of the first movable piece 12c is pressed against the supply reel base 2 to perform the braking.

If a strong tension is applied to the tape, the tape is slightly returned in the direction B of FIG. 2A, and the back tension lever 5 is slightly rotated clockwise. As a result, the pressing force of the break 12b to the supply reel base 2 is weakened, and the strong tension of the tape is weakened to the normal tension.

On the contrary, if a weak tension is applied to the tape, it is slightly returned by the force of the spring 6 in the direction opposite to the direction B of FIG. 2a by the force of the tape, and the back tension lever is slightly moved counterclockwise. 5 rotates. As a result, the pressing force of the break 12b to the supply reel base 2 is strengthened, and the weak tension of the tape is strengthened, resulting in a normal tension.

Next, when the recording / playback mode is stopped or fast-forwarded or rewound, the back tension lever 5 is rotated clockwise from the state of FIG. 2a to the state of FIG. The lever pair 12 is no longer restricted by the back tension lever 5, and the brake lever pair 12 is rotated counterclockwise by the spring 8 to brake the supply reel base 2 by the brake 12f.

Therefore, the supply reel base 2 is rotated by an extra force or the like, and the above operation and stop state can be maintained without the tape being loosened or pulled.

The braking force between the brake 12b and the brake 12e is set so that the brake 12b has a stronger braking force. Further, the angle between the first movable piece and the second movable piece is set in advance so that one of the brakes always brakes the supply reel base 2.

Thereby, based on a series of operations such as tape loading, it is possible to apply an appropriate tape tension and surely apply a braking force to the supply reel base 2.

[0031]

[Effect of the device]

 The present invention, in a brake mechanism that reliably brakes the supply reel base of a tape recorder, can perform brake braking with a simple structure without providing a mechanism for switching the brake mechanism, and can be used to operate the tension lever. Along with that, appropriate braking can be applied.

[Brief description of drawings]

FIG. 1 is a schematic view of the mechanism of the tape recorder of the present invention.

FIG. 2 is a view showing a relationship between a tension lever and a brake lever of the present invention.

FIG. 3 is a schematic view of a mechanism of a conventional tape recorder.

[Explanation of symbols]

 1 reel chassis 2 supply reel stand 3 take-up reel stand 4 idler gear 5 back tension lever 6 spring 8 spring 12 brake lever pair

Claims (1)

[Scope of utility model registration request] 1. A tape cassette is pulled out from a tape cassette,
An arm that applies appropriate tension to the tape, a first braking lever that engages with the arm during recording and reproduction, and applies an appropriate braking force to the supply reel by the operation of the arm, and is integrally formed with the first braking lever. , A second braking lever that applies a light braking force to the supply reel when the first braking lever is not engaged with the arm.