JPH0652009U - Rotary head device such as cassette tape recorder - Google Patents

Abstract

(57) [Summary] [Purpose] To make each head of the rotary head device rotate smoothly. A lever 62 of a drive gear 6 for rotating a rotary base 3 to which heads 1 and 2 are attached is arranged so that action sides 74A and 74B on both sides of a bifurcated spring 72 can abut. The root 73 of the bifurcated spring 72 is fixed to the head switching plate 7. When performing the forward operation, the head switching plate 7 moves to the right. As a result, the lever 62 is gradually pushed rightward by the left action side 74A of the bifurcated spring 72, and the drive gear 6 rotates upward. As a result, the rotation base 3 smoothly rotates to the right, and when the heads 1 and 2 are positioned on the lower side, the rotation of the rotation base 3 is stopped. At this time, since the lever 62 is urged to the right by the action side 74A, the heads 1 and 2 become stable even if vibration is applied.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a rotary head device such as a cassette tape recorder suitable for application to an auto-reverse type cassette tape recorder.

[0002]

[Prior art]

 The rotary head unit mounted on the auto-reverse type cassette tape recorder rotates the entire head 180 ° as the tape running direction changes, and the magnetic head is turned upside down and placed at the specified track position. It is generally done.

FIG. 5 shows an example of a conventional rotary head device. The recording / reproducing head 1 and the erasing head 2 are mounted on the front surface of the rotary base 3 so as to face a specified track of a cassette tape (not shown). The rotation base 3 is in the shape of a disc, and the front side thereof has a clearance in the concave circular receiving hole 41 of the front frame 4 standing upright along the running direction of the tape so that the rotation of the rotation base 3 can be allowed. Has been inserted.

Here, a well-known means (not shown), for example, a reference portion including a V-shaped pedestal for receiving the rotation base 3 is provided on the lower end surface side of the receiving hole 41, and the rotation base 3 serves as the reference portion. The heads 1 and 2 are arranged at specified track positions in a contact state. Further, a protrusion 10 is provided on the side surface of the rotation base 3 so that the heads 1 and 2 are located on the upper side when the heads 1 and 2 are arranged in a predetermined rotation position, and the head pressing spring 9 lowers the protrusion 10. By pressing it to the side, the rotary base 3 is pressed against the reference portion and the heads 1 and 2 are held at a predetermined height.

A rotary shaft 31 having the same center of rotation is fixed to the rear end side of the rotary base 3, and a rear end portion of the rotary shaft 31 having a rear end parallel to the front frame 4 has a bearing hole (not shown) in the rear frame 5. It is rotatably fitted in. A pinion 32 for rotating the rotary base 3 is fixed to an intermediate portion of the rotary shaft 31.

On the left side of the pinion 32, a fan-shaped drive gear 6 rotatably attached to the rear frame 5 by a support shaft 61 is meshed. By rotating the drive gear 6 by a predetermined angle, the rotation base 3 can be rotated 180 ° to reverse the arrangement of the recording / reproducing head 1 and the erasing head 2.

A lever 62 extending downward is provided on the support shaft 61 side of the drive gear 6, and the lever 62 is inserted into an opening 71 of a head switching plate 7 that horizontally moves in the traveling direction of the cassette tape. There is. The head switching plate 7 horizontally moves for a stroke in a predetermined direction by a separate driving device as the traveling direction of the cassette tape changes. As a result, the drive gear 6 rotates about the support shaft 61 by a predetermined angle.

Between the drive gear 6 and the rear frame 5, a string-shaped reversing spring 51 is interposed. The reversing spring 51 is a spring for holding the drive gear 6 in the upper or lower rotational position. As a result, the drive gear 6 can be stably held at the lower limit position or the upper limit position, and the rotation base 3, and hence the recording / reproducing head 1 and the erasing head 2 are prevented from rotating carelessly due to vibration or the like. To be prevented.

As shown in FIG. 6, the rotation of the rotation base 3 is such that the locking portions 33 projecting from the side surface of the rotation base 3 are positioned on the left and right of the rotation base 3 and screwed into the upper frame 8. It is regulated by contacting the lower end surface of the fixed screw 81 (only one side is shown in FIG. 5). That is, in the figure (a), the left rotation is restricted, and in the same figure (b), the right rotation is restricted. As a result, the heads 1 and 2 are held at the prescribed positions. The positioning screw 81 is stopped by a nut 82 or the like after the position is adjusted.

[0010]

[Problems to be solved by the device]

 In the above rotary head device, the drive gear 6 is used to rotate the rotary base 3, and when the rotation direction of the drive gear 6 is switched by the head switching plate 7, the drive gear 6 is moved to the upper limit position or the lower limit position. As a means for holding at, a string-shaped reversing spring 51 is used. As shown in FIG. 7, this reversing spring 51 is provided with straight line portions 52A and 52B at both ends of the coil, and the tip end of one straight line portion 52A is rotatably attached to a fulcrum 54 of the rear frame 5 and the other end. The tip of the linear portion 52B is rotatably attached to the action point 53 of the drive gear 6. The reversing spring 51 is attached so that the urging force F acts in the direction in which the linear portions 52A and 52B open.

Now, when the drive gear 6 is at the upper limit position as shown in FIG. 3A, the urging force F of the reversing spring 51 applied to the action point 54 is used to rotate the drive gear 6 upward. . As a result, the drive gear 6 becomes stable at the upper limit position. On the other hand, when the drive gear 6 is at the lower limit position, the urging force F of the reversing spring 51 acts so as to rotate the drive gear 6 downward, as shown in FIG. This stabilizes the drive gear 6 in the lower position.

By the way, when the tape recorder is switched from the forward operation to the reverse operation, for example, the drive gear 6 is rotated to switch from the upper limit position to the lower limit position. At this time, the urging force F, which has been acting to rotate the drive gear 6 upward, is being switched to rotate the drive gear 6 downward. At this time, the direction of the rotational force due to the urging force F suddenly changes, so that the drive gear 6 rapidly rotates downward and the rotary drum 3 also rapidly rotates. Then, the hooking portion 33 collides with the positioning screw 81 and the rotation base 3 stops.

Since the impact at this time is applied to each of the heads 1 and 2 and the parts outside thereof, problems such as unstable performance of the tape recorder and gradual loosening of mounting portions of respective parts may occur. there were.

Therefore, the present invention solves the above-mentioned problems and provides a rotary head device such as a tape recorder in which each head rotates smoothly and is stably held at a predetermined position. It is a proposal.

[0015]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, in the present invention, the magnetic head is mounted on an auto-reverse type cassette tape recorder, etc., and the magnetic head is rotated along with the reversal of the tape running direction, and the tape contact position of the magnetic head with respect to the magnetic tape. In the rotary head device in which the magnetic head is changed, a means for gradually rotating the magnetic head and holding the magnetic head at a predetermined position is provided.

[0016]

[Action]

 In the neutral state, both working sides 74A and 74B of the forked spring 72 are in contact with the lever 62 as shown in FIG. 2B, and the biasing forces F1 and F2 having opposite directions act on the lever 62. There is. As a result, the drive gear 6 (FIG. 1) is stably held at a predetermined position, so that the heads 1 and 2 are stably held at a predetermined position.

When switching from the neutral state to the forward operation, the front frame 4 (FIG. 1) moves forward and the head switching plate 7 moves rightward. As a result, as shown in FIG. 3B, only the urging force F1 of the left action side 74A of the bifurcated spring 72 gradually acts on the lever 62 to urge the lever 62 to the right side. , 2 will rotate smoothly. Further, since the drive gear 6 is stably held at the lower limit position, the heads 1 and 2 are stably held at the upper prescribed positions.

When switching to the reverse operation, the front frame 4 moves to the front side from the neutral state, and the head switching plate 7 moves to the left side. As a result, as shown in FIG. 4B, only the urging force F2 of the right side action side 74B gradually acts on the lever 62. As a result, the heads 1 and 2 rotate smoothly, and are stably held at the upper prescribed position.

[0019]

【Example】

 Next, an embodiment of a rotary head device such as a cassette tape recorder according to the present invention will be described in detail with reference to the drawings. The same parts as those described above are designated by the same reference numerals and detailed description thereof is omitted.

FIG. 1 shows the configuration of a rotary head device such as a cassette tape recorder according to the present invention. In this rotary head device, a columnar locking portion 71 is provided on the head switching plate 7 in a protruding manner, and a bifurcated spring 72 is attached to the root switching portion 7 by locking the root portion 73. Both action sides 74A and 74B of the bifurcated spring 72 are arranged so as to sandwich the lever 62 of the drive gear 6, and the tip end side thereof is hooked on a spring position restricting portion 75 fixed to the head switching plate 7.

Now, when the recording / reproducing head 1 and the erasing head 2 are in the neutral state as shown in FIG. 2A, both working sides of the bifurcated spring 72 are shown in the same figure as shown in FIG. 2B. The intermediate portion of 74 A and 74 B is in contact with the lever 62 of the drive gear 6. In this state, urging forces F1 and F2 in opposite directions are acting on the lever 62 of the drive gear 6 from both working sides 74A and 74B, whereby, for example, even if vibration is applied to the tape recorder body, the rotation base 3 Will be stably maintained in the neutral state.

Here, when performing the forward operation, the head switching plate 7 is moved to the right as the front frame 4 is moved forward. As a result, the lever 62 of the drive gear 6 moves forward, and the biasing force F 1 of the left action side 74A of the bifurcated spring 72 gradually acts on the lever 62 to rotate the drive gear 6 upward. Thus, the heads 1 and 2 are arranged on the lower side as shown in FIG.

In this case, as shown in FIG. 2B, the biasing force F1 of the left action side 74A of the bifurcated spring 72 acts on the lever 62 to push the lever 62 to the right. Even if vibration is applied, the drive gear 6 is stably held at the upper limit position, and the heads 1 and 2 are stably held at a predetermined lower position.

Further, when performing the reverse operation, the front frame 4 is moved to the front side from the neutral state, and the head switching plate 7 is moved to the left side this time. As a result, the lever 62 of the drive gear 6 is pushed to the left by the action side 74B on the right side of the bifurcated spring 72, and the drive gear 6 gradually rotates downward.

As a result, as shown in FIG. 4A, the rotation base 3 smoothly rotates to the left, and the heads 1 and 2 are arranged at predetermined positions on the upper side. At this time, the urging force F2 of the right side 74B of the bifurcated spring 72 is applied to the lever 62 to push the lever 62 to the left as shown in FIG. Well kept. Therefore, the heads 1 and 2 can be stably held at predetermined positions even if vibration or the like is applied.

Further, as the bifurcated spring 72 is closer to the root portion 73 side, the biasing forces F1 and F2 of the action sides 74A and 74B are stronger, so that the lever 62 is gradually strengthened when the operation is switched. Therefore, after the switching, a relatively strong force acts on the lever 62, so that even if the tape recorder is vibrated, the heads 1 and 2 can be stably held at predetermined positions, and the tape recorder can be held in a stable position. Performance will be stable.

The front frame 4 and the head switching plate 7 may be moved at the same time when the operation is switched, or either one may be moved first. Further, as a means for gradually urging the lever 62, an appropriate means other than the bifurcated spring 72 can be used.

[0028]

[Effect of device]

 As described above, the present invention is provided with means for gradually rotating the magnetic head of the rotary head device and for holding the magnetic head in a predetermined position. Therefore, according to the present invention, the magnetic head can be smoothly rotated at the time of switching the operation, and moreover, the magnetic head can be stably held at a predetermined position even if vibration is applied, so that the performance of the tape recorder is stable. effective.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a rotary head device such as a cassette tape recorder according to the present invention.

FIG. 2 is a diagram for explaining the position of each head and the operating state of a bifurcated spring during neutral.

FIG. 3 is a diagram illustrating the position of each head and the operating state of a bifurcated spring during forward operation.

FIG. 4 is a diagram for explaining the position of each head and the operating state of a forked spring during reverse operation.

FIG. 5 is a configuration diagram of a rotary head device such as a cassette tape recorder according to a conventional example.

FIG. 6 is a diagram illustrating a head rotation restricting unit.

FIG. 7 is a diagram illustrating an operation of a conventional reversing spring.

[Explanation of symbols]

 1 Recording / Reproducing Head 2 Erasing Head 3 Rotation Base 4 Front Frame 5 Rear Frame 6 Drive Gear 7 Head Switching Plate 51 Reversing Spring 61 Spindle 62 Lever 71 Locking Part 72 Bifurcated Spring 73 Roots 74A, 74B Working Side 75 Spring Position control unit

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hirosei Nishiren 1-2-11 Ikenohata, Taito-ku, Tokyo Inside Aiwa Co., Ltd.

Claims (1)

[Scope of utility model registration request] 1. A rotary head device mounted on an auto-reverse type cassette tape recorder or the like, wherein the magnetic head is rotated in accordance with the reversal of the tape running direction, and the tape contact position of the magnetic head with respect to the magnetic tape is changed. A rotary head device such as a cassette tape recorder, which is provided with means for gradually rotating the magnetic head and holding the magnetic head at a predetermined position.