JPH0728601Y2 - Brake mechanism of tape recorder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a brake mechanism for a reel base in a tape recorder that uses a tape such as a DAT to be pulled out and used.

(Prior Art) Generally, in a tape pull-out type tape recorder such as a DAT, a head is fixed even if loading is repeated by applying a brake to one reel base to fix the reel base at the time of loading / unloading the tape. The position of the tape with respect to does not change. Further, when the tape is running, especially during high-speed search, an appropriate back tension is applied to the tape supply reel base in order to stabilize the running of the tape.

A brake mechanism is used to fix the reel stand or give back tension to the reel stand.
This brake mechanism is generally configured to apply an appropriate braking force to the reel base by pressing a friction member such as felt against the reel base by the urging force of a spring.

(Problems to be solved by the invention) However, since the braking force for fixing the reel stand and the braking force for giving the back tension are different from each other, in order to give different braking forces to the reel stand in this way, It was necessary to provide two sets of braking mechanisms, each having a different braking force. Therefore, there is a problem that the number of parts is increased, the configuration is complicated, and the cost is increased. In addition, the space for occupying the peripheral portion of the reel stand becomes large accordingly, which hinders the reduction in size and weight, and also has a problem in that it is restricted in design.

(Means for Solving Problems) A brake mechanism of a tape recorder according to the present invention includes a brake lever that is biased by a first spring and can be pressed against a reel base to apply a braking force to the reel base, and a second spring. A rotating lever that is urged toward the reel lever, and the brake lever is pressed against the reel base by the urging force of the first spring to apply the braking force to the brake lever.
An arm and a second arm formed in a substantially V shape are formed by the first arm, while the rotation lever has the first arm and the second arm.
A contact portion that contacts the inner surface of the arm and a sliding portion that slides on the cam surface of the operating lever provided on the chassis are formed.
The cam surface causes the contact portion of the rotating lever to contact the inner side surface of the first arm by the urging force of the second spring, and applies a synergistic braking force of the first spring and the second spring to the brake lever. The lower range part and the contact part of the rotating lever are arranged between the first arm and the second arm, and the middle range part that gives the brake lever only the urging force of the first spring to the brake lever, and the rotating lever. The abutting portion of the second spring against the inner surface of the second arm against the biasing force of the second spring to separate the brake lever from the reel base against the biasing force of the first spring. A high-frequency region is formed in which the urging forces of both the spring and the second spring do not act.

(Operation) By operating the operating means, the sliding portion of the rotating lever is slidably arranged on the cam surface of the operating means to rotate the rotating lever,
Two different types of braking force are applied to the reel stand by selectively exerting the urging force of the first spring and the second spring acting on the brake lever on the reel stand to press the brake lever against the reel stand.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

1 to 3 show the schematic construction of a brake mechanism of a tape recorder according to the present invention. FIG. 1 is a loading state, FIG. 2 is a reproducing state, and FIG. 3 is a high-speed searching state. Are shown respectively.

In the figure, reference numeral 1 denotes a take-up reel base rotatably supported on a chassis, and an outer peripheral portion 2 of the take-up reel base 1 is
It is a passive portion with which a brake pad described later comes into contact.

Reference numeral 3 is a brake lever pivotally supported by a chassis shaft 5. This brake lever 3 has two arms 6,7
(The arm 6 is the first arm in the claims and the arm 7 is the second arm in the claims.), And the one arm 6 has an outer peripheral portion of the reel base 1. A brake pad 8 is provided which abuts on 2. A friction member such as felt is used as the brake pad 8. Further, the brake lever 3 is biased by the first spring 10 in the counterclockwise direction in the drawing, that is, in the direction in which the brake pad 8 is pressed against the outer peripheral portion 2. The urging force of the first spring 10 is set so that the brake pad 8 pressed against the outer peripheral portion 2 exerts a braking force for back tension on the reel base 1.

Reference numeral 11 denotes a rotation lever rotatably supported on a chassis by a shaft 14. The rotating lever 11 is formed with an abutting portion 12 that can come into contact with the inner side surfaces of both arms 6 and 7 of the brake lever 3 and a sliding portion 13 that slides on a cam surface 18 of an operation lever 16 described later. Has been done. The rotating lever 11 is urged by the second spring 15 in the clockwise direction in the figure. Due to the biasing force of the second spring 15, the contact portion 12 of the rotating lever 11 contacts the arm 6 of the brake lever 3. As a result, the brake pad 8 of the arm 6 is given a synergistic biasing force of the first spring 10 and the second spring 15. The urging force at this time is set so that a braking force for fixing the reel base 1 is exerted by the brake pad 8 pressed against the outer peripheral portion 2.

Reference numeral 16 is an operation lever (operation means) for operating the brake lever 3 and the rotating lever 11. This operating lever 16
An elongated hole 17 is formed in this, and a pin 19 pivotally supported on the chassis is fitted into this elongated hole 17. Therefore, the long hole 17 of the operating lever 16 slides on the pin 19 so that the operating lever 16 can slide in the arrow AB direction in the drawing. The operation lever 16 is formed with a cam surface 18 that comes into contact with the sliding portion 13 of the rotating lever 11 and operates the rotating lever 11. The cam surface 18 includes a low-frequency part 18a, a high-frequency part 18b, and a mid-frequency part 18c from the left in the figure
Is formed in. A taper surface is formed between the low band portion 18a, the high band portion 18b, and the middle band portion 18c so that the sliding portion 13 can smoothly slide on the cam surface 18. Further, the operation lever 16 is adapted to take three slide positions shown in FIGS. 1 to 3 depending on the mode state of the tape recorder.

Next, the operation of the brake mechanism configured as described above will be described first.
A description will be given with reference to FIGS.

First, FIG. 1 shows a loading state, in which the operating lever 16 is in a position moved most toward the B direction.
At this time, the sliding portion 13 of the rotating lever 11 is located above the low-frequency portion 18a of the cam surface 18 of the operating lever 16, and the rotating lever 11 is not affected by the operating lever 16.
In this state, the rotating lever 11 makes its contact portion 12 contact the arm 6 of the brake lever 3 by the urging force of the second spring 15, so that the brake lever 3 moves between the first spring 10 and the second spring 15. The brake pad 8 is pressed against the outer peripheral portion 2 of the reel stand 1 under the synergistic biasing force. Therefore, the reel stand 1 has the first spring 10 and the second spring 10.
The tape is fixed by the action of the spring 15, and the tape is pulled out and stored.

Next, FIG. 2 shows a reproduction state, in which the operation lever 16
Moves from the loading state in the direction A to the pin 19
Is in the approximate center of the long hole 17. At this time, the sliding portion 13 of the rotating lever 11 slides on the cam surface 18 and is in contact with the high-frequency portion 18b of the cam surface 18 of the operating lever 16. As a result, the rotating lever 11 rotates counterclockwise against the urging force of the second spring 15, the contact portion 12 thereof contacts the arm 6, and the brake lever 3 moves to the first spring 10. Rotate in a clockwise direction against the urging force of. Therefore, the brake pad 8 of the brake lever 3 is separated from the outer peripheral portion 2 of the reel base 1, and the reel base 1 is not affected by the brake lever 3 and is in a free state, and the tape is wound by the reproduction drive mechanism. Be seen.

Further, FIG. 3 shows a high-speed rewind search state, in which the operation lever 16 is further moved in the A direction from the position in the reproduction state and is at the slide position closest to the A direction. At this time, the sliding portion 13 of the rotating lever 11 slides on the cam surface 18 and is in contact with the middle region 18c of the cam surface 18 of the operating lever 16. As a result, the contact portion 12 of the rotary lever 11 is located at the center of the arms 6, 7 of the brake lever 3 and does not contact the arms 6, 7 without contacting the arms 6, 7.
Has no effect on. Therefore, the brake lever 3
Presses the brake pad 8 against the outer peripheral portion 2 of the reel base 1 by the urging force of only the first spring 10. As a result, the reel base 1 is given a back tension by the action of the first spring 10, and stabilizes the tape running in the high-speed rewind search state.

(Effect of the Invention) As described above, according to the present invention, the brake is simply moved by sliding the sliding portion of the rotary lever on the low, high, and middle portions of the cam surface of the operating lever. It is possible to control the braking force applied to the reel base by the lever, and because the structure is simple, it is possible to reduce the cost by reducing the number of parts and the mechanism, and there is little risk of malfunction, and it is possible to ensure Can be activated. Further, as a result, the space for occupying the peripheral portion of the reel stand is reduced, the size and weight can be reduced, and the restrictions on design are alleviated.

[Brief description of drawings]

1 to 3 show a schematic structure of a brake mechanism of a tape recorder according to the present invention. FIG. 1 is a plan view showing a loading state, FIG. 2 is a plan view showing a reproducing state, and FIG. 3 is a high speed. It is a top view which shows a rewinding search state. 1 ... Reel stand, 3 ... Brake lever 10 ... First spring 11 ... Rotating lever 15 ... Second spring 16 ... Operating lever (operating means)

Claims (1)

[Scope of utility model registration request] 1. A brake lever urged by a first spring to be pressed against a reel base to apply a braking force to the reel base, and a rotating lever urged by a second spring, the brake lever The first spring applies a braking force to the reel stand by pressing it against the reel base.
An arm and a second arm formed in a substantially V shape are formed by the first arm, while the rotation lever has the first arm and the second arm.
A contact portion that contacts the inner surface of the arm and a sliding portion that slides on the cam surface of the operating lever provided on the chassis are formed.
The cam surface causes the contact portion of the rotating lever to contact the inner side surface of the first arm by the urging force of the second spring, and applies a synergistic braking force of the first spring and the second spring to the brake lever. The lower range part and the contact part of the rotating lever are arranged between the first arm and the second arm, and the middle range part that gives the brake lever only the urging force of the first spring to the brake lever, and the rotating lever. The abutting portion of the second spring against the inner surface of the second arm against the biasing force of the second spring to separate the brake lever from the reel base against the biasing force of the first spring. A brake mechanism for a tape recorder, characterized in that a high-frequency portion is formed in which the urging forces of both the spring and the second spring do not act.