JPH0337147Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a rotation transmission device such as a tape recorder.

Many devices have been proposed for driving the reel stands of tape recorders, etc., but recently, the rotation axis of the motor has been proposed because the configuration is simple and the rotational force is reliably transmitted to the reel stand. An idler gear is disposed on a rotary lever rotatably mounted on the same axis as the rotary shaft, and an idler gear is disposed in a constant meshing relationship with a gear attached to the rotary shaft, and the rotary lever is oscillated in accordance with the rotational direction of the motor. A rotation transmission mechanism that is configured to rotate the reel and transmit the rotation to a predetermined reel stand is widely used.

In the above-mentioned mechanism, since the rotary lever and idler gear swing in response to the rotation of the motor, a certain amount of load must be applied between the rotary lever and the idler gear or between the motor gear and the rotary lever. However, this load becomes a load on the motor after the idler gear engages with the reel stand and transmits rotation, so normally it is not possible to increase this too much, and the rotation lever and idler gear are It is set to a very light load necessary for swinging motion.

However, with the above configuration, since the load is light, the force that presses the idler gear into contact with the reel stand when the motor rotates, that is, the biting force, is weak, and the idler gear is often repelled from the reel stand and cannot mesh. This has become a bigger problem than before.

The present invention was developed to solve the above-mentioned problems, and when the idler gear swings in response to the rotation of the motor, a relatively large load is not applied until the idler gear engages with one of the reel stands. To provide a novel rotation transmission device that increases the meshing force of an idler gear with a reel stand, releases the meshing of the idler gear with the reel stand, and controls the rotation system so that it does not become an unnecessary load. It is something to do.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the rotation transmission device of the present invention will be described in detail below with reference to the drawings.

In each figure, 1 is a chassis, and reel stands 2a and 2b having gears 21a and 21b formed on their circumferential surfaces are rotatably pivotally mounted on the chassis 1.
A motor M for driving the reel stand is provided between them. In particular, as shown in Figure 1,
A motor gear ₃ is fitted onto the rotating shaft M1 of the motor M, and a rotary lever 4 is loosely fitted onto the upper extension portion of the motor gear 3 of the rotating shaft _M1 with a bearing 4a. An idler gear 5 is rotatably attached to a shaft 6 installed at one end of the rotary lever 4 so as to be in constant mesh with the motor gear 3, and an idler gear 5 is rotatably attached to the shaft 6 at the other end for balancing the rotary lever 4. A balancer 7 is attached. Further, a locking plate 8 in which a hole 8a through which the motor gear 3 escapes is formed is fixed to the lower side of the rotating lever 4 by caulking between the lower part of the balancer 7 and the tip 6a of the shaft 6, and is further fixed to the idler gear 5. Friction is provided between the idler gear 5, the rotating lever 4, and the locking plate 8 by disposing a leaf spring 9 therebetween. When the motor gear 3 rotates due to the load caused by this friction, the idler gear 5 is rotated and the rotary lever 4 itself is rotated in a direction corresponding to the direction of rotation.

In addition, on the lower surface of the locking plate 8 below the idler gear 5,
Protrusion 8 for releasing the meshing force control mechanism described later
b is formed.

On the other hand, in FIGS. 2 to 4, on the chassis 1 above the motor M, there are friction members 101a, 1 that can come into contact with the peripheral surface of the idler gear 5.
Rotating pieces 10a and 10b are provided with shafts 11a and 11b so as to be rotatable, and have engaging pieces 102a and 102b formed on the lower side that can engage with the protrusion 8b. The protrusions 103a and 103b are rotated counterclockwise and clockwise, respectively, and the protrusions 103a and 103b are rotated counterclockwise and clockwise.
The rotating range of each rotating piece is restricted by being inserted into the upper holes 13a, 13b. And these rotating pieces 10a, 10
A meshing force control mechanism is formed by b.

Further, the spring 12 described above is weaker than the pressing force, that is, the biting force of the idler gear 5 when the motor M rotates and the idler gear 5 is pressed together with the rotary lever 4 against one of the reel stands.

The rotation transmission device for a tape record or the like according to the present invention is constructed as described above, and its operation will be explained next.

FIG. 2 shows a state in which the motor M is stopped, the rotary lever 4 is not biased in any direction, and the idler gear 5 is also spaced apart from the reel stands 2a, 2b.

In this state, the rotating pieces 10a and 10b are connected to the spring 1.
2, respectively, counterclockwise and clockwise, and this state is maintained by the protrusions 103a, 103b coming into contact with the lower ends of the holes 13a, 13b on the chassis 1.

Here, when the motor M is rotated counterclockwise by a known means (not shown), the motor gear 3 starts rotating counterclockwise, and the idler gear 5 is rotated clockwise. Since a leaf spring 9 for friction is installed between the rotating lever 4 and the locking plate 8, this load causes the rotating lever 4 itself to shift the idler gear 5 to the gear on the outer periphery of the reel stand 2a. Rotate counterclockwise to engage with 21a.

Then, when the rotating lever 4 rotates counterclockwise, the outer periphery of the idler gear 5 comes into contact with the friction member 101a of the rotating piece 10a while the idler gear 5 is meshing with the reel stand 2a, as shown in FIG. A brake is applied to the circumferential surface, and the force caused by this friction acts as a force to move the idler gear 5 toward the reel stand 2a, so the load between the rotary lever 4 and the idler gear 5 has substantially increased. The same thing happens, and as a result, the rotational force for rotating the rotation lever 4 toward the reel stand 2a, that is, the biting force for meshing the idler gear 5 with the reel stand 2a increases. Therefore, unlike the conventional case, when the idler gear 5 collides with the reel stand 2a, it is not repelled and cannot be engaged.

When the rotary lever 4 continues to rotate further and the idler gear 5 comes into engagement with the reel stand 2a, as shown in FIG. engagement piece 102
In order to engage with and press the rotating piece 10a
is rotated clockwise against the spring 12, and eventually the friction member 101a is connected to the idler gear 5.
spaced apart from the circumferential surface of the The force resisting this spring 12 is applied to the idler gear 5 due to the load on the reel stand.
becomes a force to be bitten by the reel stand 2a, resulting in a state of meshing with each other.

Note that the idler gear 5 is a friction member 101.
At the stage when it comes into contact with point a, the biting force of the idler gear 5 increases as described above, but the spring 1 remains until the protrusion 8b engages with the engaging portion 102a of the rotating piece 10b.
2 is not applied to the rotating lever 4.
Therefore, the strength of the spring 12 is set to be weaker than the sum of the biting force caused by the contact between the friction member 101a and the idler gear 5 and the biting force caused by the load between the rotary lever 4 and the idler gear 5. There is.

Further, after the idler gear 5 and the reel stand 2a are engaged, the friction member 10 is attached to the idler gear 5.
Since 1a is not in contact, its rotational movement is not hindered.

Note that the operation when the motor M is rotated clockwise to rotate the reel stand 2b is the same as the above-mentioned operation, so a description thereof will be omitted.

According to this invention, in the process of the idler pulley moving from a state in which it does not make contact with the reel stand to a state in which it makes contact with the reel stand, it engages with the idler pulley and increases the force of movement toward the reel stand, and the idler pulley also We have provided a control mechanism that disengages the idler pulley after it makes contact with the reel base, so the moving force when the idler pulley collides with the reel base can be increased, and rotation transmission to the reel base can be ensured. The load on the rotation system and motor can be reduced without interfering with subsequent rotation operations.

[Brief explanation of the drawing]

Each figure shows an embodiment of the present invention. Figure 1 is a side sectional view to explain the mechanism for swinging the idler gear, and Figure 2 shows the state in which the motor is not rotating. FIG. 3 is a plan view showing a state where the motor is rotating and the idler gear is moving to mesh with the reel stand; FIG.
The figure is a plan view showing a state in which the idler gear meshes with the reel stand and transmits rotation. Explanation of symbols, 1...Shashy, 2a, 2b...
Reel stand, 3... Motor gear, 4... Rotating lever, 5... Idler gear, 10a, 10b... Rotating piece, 12... Spring, 101a, 101b... Friction member, M... Motor.

Claims (1)

[Claims for Utility Model Registration] A reel stand driving motor provided between a pair of reel stands placed on the chassis, a motor pulley attached to the rotating shaft of this motor, and The idler pulley includes at least a rotatable lever arranged to be freely rotatable, and an idler pulley attached to the rotary lever via a friction means so as to be in rotational contact with the motor pulley, and the idler pulley In a rotation transmission device such as a tape recorder configured to selectively contact one of the reel stands and transmit the rotation of the motor to the reel stand via an idler pulley, the idler pulley may be in contact with the reel stand. A control mechanism that engages the idler pulley in the process of moving from a non-contact state to a rolling contact state to increase the force of movement toward the reel stand, and disengages after the idler pulley rolls into reel stand. A rotation transmission device for a tape recorder, etc., characterized by being provided with.