JPS6141136Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tape recorder, and more particularly to an operation switching mechanism for a tape recorder configured to switch operations using the rotational force of an electric motor.

The operation switching mechanism of a tape recorder is generally a mechanical type in which the drive mechanism is switched by pressure on an operation button, and an electronic type in which the drive mechanism is switched by the suction force of a plunger. Recently, devices in which the drive mechanism is switched by the rotational force of an electric motor are becoming popular. The present invention provides an operation switching mechanism for a tape recorder configured to switch operations using the rotational force of the electric motor, and will be described in detail below with reference to the drawings.

The drawings all relate to the operation switching mechanism of the present invention, and FIG. 1 shows the non-switching operating state, FIG. 2 shows the state in the middle of switching, FIG. 3 shows the switching completed state, and FIG. 4 shows the return to the non-switching operating state. It is a top view which shows the state in the middle of.
In the figure, reference numeral 1 denotes an operating lever that is slidably attached to a fixed base plate 4 by pins 2 and 3, and an operating button 5 is attached to it, and an arrow A indicates the non-operating position by a spring 6. is biased in the direction. A lock member 7 is slidably attached to the fixed base plate 4 by a pin 8, and is urged by a spring 9 in the direction of arrow B, which is the lock position, and is formed on the operating lever 1. The operating lever 1 is engaged with the lock portion 10 that is
A locking piece 11 is formed for locking it in the operating position. A driving gear 12 is rotatably attached to the fixed base plate 4 by a shaft 13, and the rotation of the electric motor is transmitted by a belt or the like. A driving gear 14 is meshed with the driving gear 12 and driven to rotate when switching operations. It is a switching gear that switches the operation of the tape recorder, and some of its teeth are provided with missing teeth 15. The switching gear 14 includes a first cam 16 that performs operation switching, a blocking piece 17 that prevents meshing with the driving gear 12, and the driving gear 12.
A second cam 18 is formed which acts to engage. 19 is a pin 2 provided on the fixed board 4
0 and said switching gear 1
This spring contacts the second cam 18 formed in the second cam 4 and urges the switching gear 14 to rotate in the direction of meshing with the drive gear 12. Reference numeral 21 denotes a control member which is rotatably attached to the fixed base plate 4 by a shaft 22 and biased clockwise by a spring 23, and is formed on the control protrusion 24 and the switching gear 14. A blocking portion 25 is formed that engages with the blocking piece 17 to prevent the switching gear 14 from meshing with the driving gear 12 . 26
is a trigger member rotatably mounted on the operating lever 1 by a shaft 27 and biased counterclockwise by a spring 28; A contact portion 29 is formed that contacts the portion 24 . 3
0 is a regulating piece formed on the trigger member 26 and regulating rotational displacement of the trigger member 26 in the counterclockwise direction, and is arranged in the hole 1a formed on the operating lever 1. There is. In such a configuration, the control protrusion 24 of the control member 21 is formed with first and second inclined parts 24a and 24b, and the abutting part 29 of the trigger member 26 is formed with the first and second inclined parts 29a and 24b. 29b.

The operation switching mechanism of the present invention is constructed as described above, and its operation will be explained next. In the non-switching operating state shown in FIG.
The switching gear 14 is in a state of being engaged with the drive gear 12 to prevent the switching gear 14 from meshing with the drive gear 12. In such a state,
When the user operates the operation button 5 to change the operation, the operation lever 1 is displaced in the direction of arrow C against the biasing force of the spring 6. When the operating lever 1 is displaced in the direction of arrow C, the operating lever 1
The trigger member 26 attached above is similarly displaced in the direction of arrow C. The trigger member 26
When the trigger member 26 is displaced in the direction of arrow C, the trigger member 26
The first inclined portion 29a of the contact portion 29 formed in
comes into contact with the second inclined portion 24b of the control protrusion 24 formed on the control member 21. As a result, the control member 21 is rotated counterclockwise by the trigger member 26 against the biasing force of the spring 23. When the control member 21 is rotated counterclockwise, the blocking portion 25 formed on the control member 21 and the blocking piece 1 formed on the switching gear 14
7 is disengaged. As a result, the switching gear 14 is slightly rotated clockwise by the biasing force of the spring 19, and meshes with the driving gear 12 as shown in FIG. When the switching gear 14 meshes with the driving gear 12, the rotation of the driving gear 12 is transmitted to the switching gear 14, causing the switching gear 14 to rotate clockwise. When the operating lever 1 is further displaced in the direction of arrow C from the state shown in FIG.
Since the contact relationship between the control member 21 and the control member 21 is released, the control member 21 is rotated clockwise by the biasing force of the spring 23. Therefore, when the switching gear 14 rotates once due to engagement with the driving gear 12, the blocking portion 25 of the control member 21 engages with the blocking piece 17, so that the driving gear 12 of the switching gear 14
Re-meshing after the meshing is released by the toothless portion 15 is prevented. Further, the operating lever 1 is locked in the operating position by engagement between a locking piece 11 formed on the locking member 7 and a locking portion 10. FIG. 3 shows a state in which such a switching operation has been completed, but if the member that switches the operating mechanism of the tape recorder is displaced by the first cam 16, which rotates once as the switching gear 14 rotates, Operations such as playback can be switched.

The switching operation is performed as described above, but next, the operation when the lock of the operating lever 1 is released by the stop operation will be explained. When the stop operation is performed, the drive mechanism that was in the operating state is switched to the stopped state, and the lock member 7 is displaced in the direction of arrow D, and the engagement between the lock piece 11 and the lock part 10 is released, so that the drive mechanism is in the operating position. The operating lever 1 is displaced in the direction of arrow A by the biasing force of the spring 6. When the operating lever 1 is displaced in the direction of arrow A, the trigger member 26 mounted on the operating lever 1 is similarly displaced in the direction of arrow A. When the trigger member 26 is displaced in the direction of arrow A, the contact portion 29 formed on the trigger member 26
The second inclined portion 29b abuts on the first inclined portion 24a of the control protrusion 24 formed on the control member 21. As a result, the trigger member 26 is rotated clockwise by the control member 21 against the biasing force of the spring 28. FIG. 4 shows such a state. From this state, the operating lever 1 is further displaced in the direction of arrow A and returns to the non-operating position shown in FIG. 1. In this way, when the operating lever 1 returns to the non-operating position, the trigger member 26 is rotated and the control member 21 is not rotated, so that a malfunction in which the switching gear 14 meshes with the drive gear 12 is prevented. It never happens.

In this embodiment, a so-called lock-type switching mechanism in which the operating lever 1 is locked in the operating position by the locking member 7 has been described, but a so-called non-locking switching mechanism in which the operating lever 1 is not locked in the operating position has been described. It can also be adopted.

As explained above, the operation switching mechanism of the present invention moves the operating lever to the operating position by selecting the pivot points of the control member that controls the meshing of the switching gear with the drive gear and the trigger member. The trigger operation is performed only when the displacement occurs, and this structure simplifies the structure, making it possible to replace the operation switching mechanism that uses the rotation of the electric motor, which inevitably complicates the structure, into a small size. The present invention has great effects when applied to a tape recorder.

[Brief explanation of the drawing]

The drawings all relate to the operation switching mechanism of the present invention, and FIG. 1 shows the non-switching operating state, FIG. 2 shows the state in the middle of switching, FIG. 3 shows the switching completed state, and FIG. 4 shows the return to the non-switching operating state. It is a top view which shows the state in the middle of. Explanation of main figure numbers, 1... Operating lever, 7... Lock member, 12... Drive gear, 14... Switching gear, 16... First cam, 17... Blocking piece, 18...
... second cam, 21 ... control member, 24 ... control protrusion, 25 ... blocking section, 26 ... trigger member,
29...Abutment part.

Claims (1)

[Scope of utility model registration request] In a tape recorder configured to switch operations using the rotational force of an electric motor, a drive gear to which rotation of the electric motor is transmitted; a switching gear that meshes with the drive gear when switching operations and switches operations by its rotation; a control member rotatably attached to a fixed substrate and controlling the meshing operation of the switching gear with the drive gear; an operating lever that is displaced from a non-operating position to an operating position during a switching operation; and the operating lever. a trigger member which is rotatably provided on the top and is formed with an abutting portion that abuts a control protrusion formed on the control member, when the operating lever is displaced to the operating position; A contact portion formed on the trigger member contacts a control protrusion formed on the control member to rotationally displace the control member, thereby meshing the switching gear with the drive gear. Further, when the contact portion of the trigger member contacts the control protrusion as the operating lever returns to the non-operating position, the trigger member is rotationally displaced, and the control member is rotated. An operation switching mechanism for a tape recorder, characterized in that rotational displacement is prevented.