JPH0337155Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to an auto-reverse mechanism for a cassette tape recorder in which a head base is driven by an electric means (so-called logic controlled) such as a motor.

[Conventional example and its drawbacks]

1 and 2 show a conventional example, FIG. 1 is a plan view showing the main parts of the auto-reverse mechanism, and FIG. 2 is a front view of FIG. 1.

In the drawing, 1 is a head base, 2 is a pair of left and right rectangular holes drilled in the head base 1, and 3 is left and right levers whose bases are rotatably supported by a shaft 4 on the head base 1. outer arm 5 of
is located above the rectangular hole 2 of the head base 1,
A spring 7 is stretched around a hook portion 6 provided inside each lever 3. Reference numeral 8 denotes a U-shaped pinch roller support arm rotatably supported by a shaft 9 on both outer chassis of the head base 1, and the pinch roller 10 is supported by opposing side plates 8a of the support arm 8. is rotatably supported by a shaft 11. The outer arms 5 of the left and right levers 3 are urged in opposite directions by the spring 7, and the shaft 11 of the pinch roller 10 is pushed into the left and right rectangular holes 2 of the head base 1.
It presses against the upper edge 2a.

In FIG. 1, when the head base 1 is moved in the direction of arrow A in FIG. 1 using an electric means such as a motor during a play operation, the lever 3 is also moved together with the shaft 11 of the pinch roller 10.
is moved approximately in the A direction. In such a case, for example, the pinch roller 10 on the right side of the drawing moves in an arc with the axis 9 of the pinch roller support arm 8 as a fulcrum, and the axis 11 of the pinch roller 10 moves through the rectangular hole 2 of the outer arm 5 of the lever 3.
It moves slightly to the right in Figure 1 while being clamped by the upper edge 2a. At this time, pinch roller 10
Frictional force acts at two places: the shaft 11 of the lever 3, the upper edge 5a of the outer arm 5 of the lever 3, and the upper edge 2a of the rectangular hole 2.
This frictional force hinders the operation of moving the head base 1, making it difficult to move the head base 1. To counter this, the rotational torque of the motor (not shown) that drives the head base 1 must be increased, which only increases current consumption. This had the disadvantage of raising the unit price of the set itself.

Also, from a work perspective, when assembling the pinch roller 10, the outer arm 5 of the lever 3 should be moved as shown in FIG.
It is biased by the upper edge 2a of the rectangular hole 2 of the head base 1, and there is no space for the shaft 11 of the pinch roller 10 to be inserted. It has the disadvantage that it requires an additional process to remove and takes time to integrate.

[Purpose of invention]

The present invention aims to improve the conventional drawbacks as described above, and the purpose of the present invention is to provide a cassette tape in which the force for driving the head base is made as light as possible, and the pinch rollers can be easily incorporated into the head base. The purpose is to provide an auto-reverse mechanism for recorders.

[Structure and operation of the device]

3 to 6 show an embodiment of the present invention, and FIG. 3 is a plan view showing the main parts of the auto-reverse mechanism;
4 is a front view of FIG. 3, FIG. 5 is a plan view of the main part showing the head base in the middle of movement, and FIG. 6 is a plan view of the main part showing the playing state.

Note that the same parts as in the conventional example shown in FIGS. 1 and 2 are given the same reference numerals, and detailed explanations will be omitted.

In FIG. 3, reference numeral 12 denotes a rectangular first space 13 provided in the head base 1 and a rectangular second space 14 connected to the first space 13.
A pair of left and right L-shaped engagement holes consisting of
The diameter of the shaft 11 is set to be somewhat larger than that of the shaft 11. In addition, the bent portion 5 at the front of the outer arm 5 of the lever 3
b is the upper edge 1 of the first space 13 due to the spring 7.
3a, and the shaft 11 of the pinch roller 10 is loosely fitted into the second space 14.
Other points are the same as the conventional structure described above.

Next, the operation of the present invention will be explained. In FIG. 3, for example, during a play operation, the head base 1 is moved to the third position using electric means such as a motor.
When the lever 3 moves in the direction of arrow A in the figure, the lever 3 also moves together while being locked to the upper edge 13a of the first space 13. On the other hand, as this lever 3 moves, for example, the shaft 11 of the pinch roller 10 on the right side of the figure is moved to the fifth position.
As shown in the figure, the lever 3 comes into contact with the upper edge 5a of the outer arm 5, and in this state, the lever 3 and the pinch roller 10 continue to move together. At this time, the pinch roller 10 on the right side of the figure moves in an arc with the shaft 9 of the support arm 8 of the pinch roller 10 as a fulcrum, and the shaft 11 of the pinch roller 10 moves the upper edge 5a of the outer arm 5 of the lever 3 as shown in FIG. Move to the right. As the head base 1 moves, the rotation of the pinch roller 10 on the left side of FIG. 5 is restricted by a regulating means (not shown) for the pinch roller 10. Therefore, only the pinch roller 10 on the right side in the figure continues to move, and finally the pinch roller 10 on the right side and the capstan 15 come into contact. When the head base 1 is further overstroked to ensure contact between the pinch roller 10 and the capstan 15, only the shaft 11 of the pinch roller 10 maintains its position, so the lever 3
The outer arm 5 rotates clockwise against the elasticity of the spring 7, resulting in the state shown in FIG. This state is the normal play state.

The present invention has the above-described configuration, and when the head base 1 moves, the shaft 11 of the pinch roller 10 on the right side of the drawings in FIGS. Since the pinch roller 10 moves and does not touch the upper edge 14a of the second space 14 provided in the head base 1, the frictional force generated on the shaft 11 of the pinch roller 10 due to the movement of the head base 1 is caused by the friction between the pinch roller shaft 11 and the lever. 3, and the force for moving the head base 1 can be reduced compared to the conventional one, so the motor that drives the head base 1 has a lighter rotational torque than the conventional one. can be used, the current consumption can be reduced, and the unit price of the set itself can be lowered.

Also, during assembly work, the pinch roller 10
When assembling, as shown in FIG.
is set to a size large enough to allow the shaft 11 of the pinch roller 10 to be easily fitted loosely, so the shaft 11 of the pinch roller 10 can be easily inserted into the second space 14, and therefore Workability is also better than before.

[Effect of idea]

As explained above, according to the present invention, the engagement hole is connected to the first space defining the engagement surface with the lever on one side edge, and the pinch roller communicating with the first space. The pinch roller is configured with a second space into which the shaft is inserted, and the length of the second space along the direction of movement of the head base is set larger than the diameter of the shaft of the pinch roller. By reducing the frictional force generated on the shaft only to the lever side, the force required to move the head base can be reduced, which reduces the rotational torque of the motor that drives the head base and the associated current consumption. The total cost of the cassette tape recorder can be reduced by using an inexpensive motor. Further, when the shaft of the pinch roller is inserted into the engagement hole, the lever is locked to the locking surface of the first space, and the second space has a diameter of the shaft of the pinch roller inserted therein. Since it is set larger than the conventional one, the assembly work efficiency can be improved compared to the conventional one.

[Brief explanation of drawings]

1 and 2 show a conventional example, FIG. 1 being a plan view showing the main parts of the auto-reverse mechanism, and FIG. 2 being a front view of FIG. 1. 3 to 6 show an embodiment of the present invention, FIG. 3 is a plan view showing the main parts of the auto-reverse mechanism, FIG. 4 is a front view of FIG. 3,
FIG. 5 is a plan view of the main part showing the head base in the middle of movement, and FIG. 6 is a plan view of the main part showing the playing state. 1... Head base, 3... Lever, 4, 9,
11... shaft, 5... outer arm, 6... hook, 7...
Spring, 8... Pinch roller support arm, 10... Pinch roller, 12... L-shaped hole, 13... First space, 14... Second space, 15... Capstan.

Claims (1)

[Scope of utility model registration request] A head base that is movable back and forth on the chassis and has a pair of engagement holes, a pair of levers that are rotatably supported on the head base, and a lever that is suspended between these levers and whose tip is inserted into the engagement hole. A pinch roller support arm is rotatably supported by a spring elastically biased toward the side edge, a pinch roller support arm is rotatably supported by the chassis, and is rotatably supported by the pinch roller support arm by a shaft inserted into the engagement hole. In the auto-reverse mechanism of the cassette tape recorder, the auto-reverse mechanism of the cassette tape recorder is configured such that the pinch roller comes into contact with the capstan when the shaft comes into contact with the lever that is interlocked with the movement of the head base. The hole is made up of a first space defining a locking surface with the lever and a second space that allows insertion of the shaft, and the hole is formed of a first space defining a locking surface with the lever, and a second space that allows insertion of the shaft. An auto-reverse mechanism for a cassette tape recorder, characterized in that the length is set larger than the diameter of the shaft.