JPS5914917Y2 - Tape drive device in tape recorders, etc. - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a tape drive device for a tape recorder or the like, and is suitable for a cassette tape recorder.

Conventionally, a reversible drive shaft, two reel stands for transporting the tape, and one of these reel stands is automatically pressed against the drive shaft depending on the rotational direction of the drive shaft. 2. Description of the Related Art Tape drive devices for tape recorders and the like that include an idler are known.

The present invention simplifies the configuration of a tape drive device for such a tape recorder, etc., and ensures reliable operation.As shown in the figure, a drive shaft 1 consisting of the shaft of a reversible motor 27, two reel stands 2 and 3 for transporting the tape; and an idler that is automatically pressed against one of the reel stands 2 and 3 and the drive shaft 1 depending on the rotational direction of the drive shaft 1. In a tape drive device such as a tape recorder having a spring 5
a movable body 6 biased by the movable body 6; a guide 7 for the idler 4 made of a hole provided in the movable body; and a brake shoe that controls the idler 4 when the movable body 6 is moved by the spring 5. 8, the movable body 6 is moved by the spring 5, and the idler 4
When the tape is being braked, the guide 7 guides the idler 4 away from the reel stands 2 and 3, and when the tape is to run, the drive shaft 1 starts rotating. After that, the movable body 6 is moved against the spring 5 so that the braking of the idler 4 is released, and a felt 3 is provided between the idler 4 and the brake shoe 8.
6 and a friction clutch consisting of a drum 37 that is elastically pressed by the idler 4 through the felt.

The idler 4 is rotatably provided on an arm 11 which is rotatably provided on an arm 9 with a fulcrum 10 as the fulcrum.The arm 9 is rotatably attached to a base plate (not shown) with a fulcrum 12 as the fulcrum. 13 in the counterclockwise direction.

The movable body 6 is slidably provided on the substrate, and is slid against the spring 5 via the arm 15 by the urging of the electromagnetic plunger 14.

The arm 15 is rotatably provided on the substrate with a fulcrum 16 as the fulcrum.

17.1B is a brake shoe, which is fixed to each brake arm 19, 20, and these arms 19.2
0 are rotatably attached to the base plate about fulcrums 21 and 22, respectively, and are biased by separate springs 23 and 24 to brake the reel stands 2 and 3.

When the movable body 6 is moved by the plunger 14 against the spring 5, the arm 19.20 is pressed by the branch 25.26 of the movable body 6, which spring 23.24
The shoes 17 and 18 are moved away from the circumferential surfaces of the reel stands 2 and 3, and the braking of the reel stands 2:3 is released.

A shaft 28 on which the idler 4 is rotatably provided is inserted into the guide 7.

Further, the felt 36 and the drum 37 are inserted through the shaft 28, and the felt 36 and the drum 37 constitute a friction clutch interposed between the shoe 8 and the idler 4.

29 is an arm to which the brake shoe 8 is fixed;
The shoe 8 is rotatably attached to a bearing 32 provided on the base plate, and is biased by a spring 33 so that the shoe 8 is pressed against the circumferential surface of the drum 37.

Note that 34 indicates a fulcrum of rotation of the arm 29.

Further, the arm 29 is inserted into the hole 35 of the movable body 6, and when the movable body 6 is slid against the spring 5, the arm 29 is pressed by the edge of the hole 35, and the shoe 8 is pushed against the spring 33.
is rotated away from the drum 37 in the direction in which the brake of the idler 4 is released.

In the above-mentioned tape drive device for a tape recorder or the like, the plunger 14 is deenergized in the illustrated stopped state, so the shoe 8 is pressed against the drum 37 by the spring 33, and the drum 37 and idler 4 are braked. Since the portions 25, 26 are separated from the arms 19, 20, the reel stand 2.3 is braked by the shoes 17, 18.

In this stopped state, the motor 27 is also stopped and the drive shaft 1 is also stopped.

When the drive current is supplied to the motor 27 and the excitation current is also supplied to the plunger 14 by the operation of quickly returning the tape, the shaft 1 is turned off before the plunger 14 operates because the motor 27 starts up quickly. The arm 11 receives a force that rotates the arm 11 clockwise about the fulcrum 10 via the idler 4 which is rotated counterclockwise and braked by the shoe 8 .

Following the start of rotation of the motor 27, the plunger 14 is actuated and the movable body 6 is slid against the spring 5, the narrow portion 30 of the guide 7 is moved away from the vicinity of the shaft 28, and the guide 7 is moved away from the vicinity of the shaft 28.
Since the wide portion 31 of the arm 11 is close to the shaft 28 and the arm 11 is allowed to rotate, the idler 4 is moved around the shaft 1 and the reel stand 3 by rotating the arm 11 clockwise as described above. The tape is pressed against the circumferential surface by the contact spring 13, and the driving force from the shaft 1 is transmitted to the reel stand 3 via the idler 4, and the tape is returned early by the rotation of the reel stand 3.

In the above description, a motor 27 that starts up quickly is used, but it is also possible to control the motor 27 to start up quickly compared to the operation of the plunger 14 by using an appropriate control circuit.

When the stop operation is performed in the early spring return state of the tape described above, the power to the motor 27 and the plunger 14 is cut off.
When the shaft 1 stops, the movable body 6 is slid by the spring 5, and as a result of this sliding, the reel stands 2 and 3 are braked by the contact of the shoes 17 and 18 as described above, and the shaft 2 is moved by the guide 7.
8 is guided so that it reaches the narrow part 30, and the shaft 28 is guided to the narrow part 30, so that the idler 4 reaches the reel stand 3.
(and 2) so that arm 1 is in a neutral position away from
1 is rotated.

In the above explanation, the early spring return of the tape has been described, but when the tape is rapidly forwarded, the shaft 1 is rotated clockwise, and the idler 4 is pressed against the shaft 1 and the reel stand 2.

In the present invention, a friction clutch is interposed between the shoe 8 and the idler 4 as shown above, so even if the idler 4, which is braked by the shoe 8 as described above, is driven by the shaft 1, the idler 4 becomes useless. Defects such as vibration can be eliminated.

If the idler 4 is directly braked by the shoe 8 (without using a clutch), there is a risk that the idler 4 may vibrate if the driving force of the shaft 1 or the braking force by the shoe 8 is not appropriate.

Incidentally, the friction clutch is not limited to the one in the above embodiment.
Well-known ones can be used.

[Brief explanation of drawings]

FIG. 1 is a plan view showing an embodiment of the present invention, FIG. 2 is a plan view of the main part, and FIG. 3 is a longitudinal side view. 1... Drive shaft, 2, 3... Reel stand,
4...Idler, 5...Spring, 6...
...Movable body, 7...Guide, 8...
・Brake shoes, 36...Felt, 37...
song drum.

Claims (1)

[Scope of utility model registration request] A reversible drive shaft, two reel stands for transporting the tape, and an idler that is automatically pressed against one or more of these reel stands and the drive shaft depending on the rotational direction of the drive shaft. A drive device for a tape recorder or the like, comprising: a movable body biased by a spring; a guide for the idler provided on the movable body; and a guide for the idler when the movable body is moved by the spring. a braking means for braking, wherein when the movable body is moved by the spring and the idler is braked, the guide guides the idler so that the idler leaves the reel stand; Further, when the tape is caused to run, the movable body is moved against the spring so that the brake of the idler is released after the drive shaft starts rotating, and the idler and the braking means are characterized in that the movable body is moved against the spring. A tape drive device in a tape recorder, etc., with a friction clutch interposed between the tape drive device and the tape drive device.