JPH0650813Y2 - Azimuth mechanism of tape player - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Outline] An azimuth mechanism of a tape reproducing apparatus is provided with a cam plate for adjusting an angle of a reproducing head and is provided on the cam plate.
One of the tips of the individual screws abuts on a receiving seat provided on the head base. A leaf spring inserted between the tips of these two screws and the receiving seat is provided independently for each of the two screws.

[Industrial application field]

 The present invention relates to an azimuth mechanism of a tape reproducing device.

[Conventional technology]

The azimuth mechanism of the tape reproducing device adjusts the angle of the reproducing head according to the running direction of the tape. A slide lever driven by a motor or the like controls the traveling direction of the tape, and the azimuth mechanism is provided with a cam plate which is interlocked with this slide lever.
The cam plate is provided with two screws, the head base is provided with a projecting receiving seat so as to face the tips of these screws, and one of these two screws is provided according to the rotational position of the cam plate. The tip of the is engaged with the receiving seat of the head base. Therefore, when the tape running direction is switched, the slide lever moves, the cam plate rotates, and the tip of one screw that has been engaged until then moves away from the receiving seat, and the tip of the other screw engages the receiving seat. Come to do. In order to prevent the tip of the screw from biting into the receiving seat when the tip of the screw moves toward the receiving seat at the time of conversion from one screw to the other screw, One wide leaf spring is inserted between the receiving seat and the tip of the screw so that it can move smoothly along the surface of the leaf spring.

[Problems to be solved by the device]

In the azimuth mechanism of the tape reproducing apparatus as described above, the positions of the tips of the two screws are often different as a result of the azimuth adjustment. The leaf spring extends in a slope shape so that two screws having different heights can smoothly move with respect to a single seat. But,
Since the two screws are located relatively close to each other, if the positions of the tips of the two screws are significantly different, the inclination of the leaf spring becomes considerably large. For example, if a screw with a small amount of protrusion from the cam plate is engaged with the receiving seat, and a screw with a large amount of protrusion is in contact with the surface of the leaf spring, one end of the plate spring becomes a screw with a large amount of protrusion. It is pushed and hits the surface of the head stand. Therefore, the leaf spring is arranged such that one end of the leaf spring contacts the surface of the head base, the other end of the leaf spring engages with the receiving seat, and the intermediate portion between these both ends is pressed by the screw. Therefore, the leaf spring is pressed by the screw having a large amount of protrusion so that the intermediate portion is bent, thereby giving a reactive spring force to the screw, so that the screw is pushed by the leaf spring to adjust the screw for a long time. If the amount is wrong, or the tip of the leaf spring on the receiving seat jumps up, the screw engaging with the receiving seat comes to float from the receiving seat, making it difficult to adjust the level. There was a problem of fluctuation.

The present invention has been made to solve the above-mentioned conventional problems, and a tape reproducing apparatus capable of performing reliable azimuth adjustment even when there is a difference in the positions of the tips of the two screws of the cam plate. It is intended to provide an azimuth mechanism.

[Means for Solving the Problems]

An azimuth mechanism of a tape reproducing apparatus according to the present invention comprises a cam plate for adjusting an angle of a reproducing head supported by a head base, the cam plate being slidably arranged on a post and adjusting the azimuth according to a tape traveling direction. Has two screws for height adjustment for carrying out, and the head base is formed with a receiving seat for receiving one end of one of the two screws according to the rotational position of the cam plate. A leaf spring is inserted between the tip of the screw and the receiving seat, and the leaf spring is independently provided for each of the two screws.

[Action]

In the above configuration, since the leaf spring is provided independently for each of the two screws, even if there is a difference in the positions of the tips of the two screws, if the inclination of each leaf spring is not so large. Therefore, each leaf spring does not exert a considerable spring force on each screw. Therefore, the azimuth adjustment can be performed without receiving extra force.

〔Example〕

FIG. 5 is a view showing components on the chassis base 10 inside the magnetic tape cassette deck. The cassette tape is inserted at a position above the chassis base 10. A pair of take-up reels 12, 14 are rotatably arranged to receive the inserted cassette tape. Also, two pairs of pinch rollers 16 and capstans 18 are provided on one side of the chassis base 10, and a magnetic head 20 is arranged in the middle of the two pairs of pinch rollers 16 and capstans 18. It is well known that the pinch roller 16 and the capstan 18 drive the tape in one direction or the other direction, and the magnetic head 20 makes contact with the tape for reproduction. At that time, the contact angle of the magnetic head 20 with the tape is changed (azimuth adjustment) according to the running direction of the tape.

The magnetic head 20 is mounted on a flat frame head 22. The head base 22 is connected to an actuator arm 23 driven by a motor (not shown), and moves in the direction of arrow A to bring the magnetic head 20 into contact with the tape during reproduction, and moves in the direction of arrow B during ejection to move the magnetic head.
It is designed to keep 20 away from the tape. The two capstans 18 are driven in opposite directions by a motor (not shown) via a flywheel (not shown).
The tape is inserted between each pinch roller 16 and the capstan 18, and at the time of reproduction, one pinch roller 16 is crimped to the associated capstan 18 and the other pinch roller 16 is separated from the associated capstan 18. Let The switching of the tape running direction is performed by pressing the other pinch roller 16 which has been separated so far to the associated capstan 18 and separating the pinch roller 16 which has been pressed until then from the associated capstan 18.

A slide lever 24 is provided on the rear surface side of the chassis base 10 for switching the tape running direction. The slide lever 24 is driven by, for example, a manually operated lever or a motor (not shown), and is movable in the directions of arrows C and D, for example. The slide lever 24 is provided with, for example, a tapered cam surface (not shown), and by engaging such a tapered cam surface with the shaft of the pinch roller 16, the pinch roller 16 is moved toward or away from the capstan 18. Can be operated. Further, a gear mechanism (not shown) is provided on the rear surface side of the chassis base 10 so that the rotation directions of the take-up reels 12 and 14 can be switched according to the traveling direction of the tape. Switching of the rotation directions of the take-up reels 12 and 14 can be performed by the same slide lever.

Referring to FIGS. 1 and 2, two posts 26, 28 are erected on the head base 22, and a support plate 30 supporting the magnetic head 20 is attached to these posts 26, 28.
A restraining spring 32 is disposed on the support plate 30 in an overlapping manner, and one end portion of the restraining spring 32 and the support plate 30 has a first post 26.
It is fixed to the upper end of the by a set screw 32. Retaining spring 32
The other end of the support plate 30 is slidably attached to the second post 28.

A cam plate 34 for adjusting the azimuth of the magnetic head 20 is provided, and the cam plate 34 includes a substantially flat plate portion and a sleeve portion 34a located at one end portion of the triangle. The sleeve portion 34a is slidably fitted to the second post 28, and the upper surface thereof abuts the lower surface of the support plate 30. An actuator rod 36 extending downward is attached to the other end portion of the triangle of the cam plate 34. The actuator rod 36 penetrates the hole 22a provided in the head base 22 and the hole 10a provided in the chassis base 10 and slide lever 24. Engages with a hole 24a provided in the. Therefore, when the slide lever 24 moves in the directions of arrows C and D, the cam plate 34 rotates about the second post 28. A downward stopper 38 is attached to the other end of the triangle of the cam plate 34, and the stopper 38 is an arc-shaped hole 22b provided in the head base 22.
To limit the rotational angular position of the cam plate 34.

Two azimuth adjustment screws 4 in the middle of the cam plate 34
0,42 can be installed. Two azimuth adjusting screws 40,42
To the screw hole provided on the cam plate 34.
Is attached from the upper surface side of the cam plate 34, and the tip projects from the lower surface of the cam plate 34. A projection-shaped receiving seat 44 is formed on the head base 22, and the receiving seat 44 receives one end of one of the azimuth adjusting screws 40 and 42 according to the rotational position of the cam plate 34. Further, the leaf springs 46 and 48 are inserted between the tips of the azimuth adjusting screws 40 and 42 and the receiving seat 44.

Referring to FIGS. 1 and 3, the leaf springs 46 and 48 are arranged in a superposed relationship with each other, and have a shape close to the cam plate 34, which is generally triangular when viewed from above. The leaf springs 46 and 48 respectively have holes 50 corresponding to the sleeve portion 34a at one end of the cam plate 34, and these holes 50
Are slidably fitted in the respective second posts 28. The leaf springs 46, 48 have a hole 52 slidably fitted in the actuator rod 36 at the other end of the cam plate 34. Thus, as the cam plate 34 rotates about the second post 28, each leaf spring 46, 48 also rotates about the second post 28 at the same time as each azimuth adjusting screw 40, 42. Furthermore, in the area of the remaining end of the triangle, the leaf springs 46, 48
Necks 46a, 48 that face each other without overlapping
have a. The tips of the azimuth adjusting screws 40 and 42 are arranged so as to abut the surfaces of these neck portions 46a and 48a.

Therefore, as shown in FIG. 1, when one azimuth adjusting screw 40 is engaged with the receiving seat 44 via the neck portion 46a of the leaf spring 46 as a result of the azimuth adjusting, the other azimuth adjusting screw 40 is adjusted. Even if the tip of the screw 42 projects far below the tip of the azimuth adjusting screw 40, each leaf spring 46, 4
Since 8 are independent of each other, even if there is a difference in height between the tips of the azimuth adjusting screws 40 and 42, they do not incline greatly. Therefore, the azimuth adjusting screws 40 and 42 are
The azimuth adjustment work can be reliably performed without receiving the reaction spring force from the 6,48, and the adjusted height can be maintained.

As shown in FIG. 4, when there is a difference in height between the tips of the azimuth adjusting screws 40, 42, the neck portion 4 of each leaf spring 46, 48
The heights of 6a and 48a have the same difference. When the cam plate 34 is rotated according to the switching of the tape running direction,
The neck portions 46a and 48a move in the direction of arrow E in FIG. 4, for example, and the engaging portion for the receiving seat 44 moves from the neck portion 46a to the neck portion 48a. At this time, the opposite end portions 46b, 48b of the respective neck portions 46a, 48a are preferably bent upward with a roundness so that the lower neck portion 48a can be smoothly engaged with the receiving seat 44. .

[Effect of device]

As described above, according to the present invention, the cam plate for adjusting the angle of the reproducing head supported by the head base is provided, the cam plate is slidably arranged on the post, and the azimuth according to the tape running direction. It has two screws for height adjustment for adjustment, and the head base is formed with a receiving seat for receiving one end of one of the two screws according to the rotational position of the cam plate. Since a leaf spring is inserted between the tip of the screw and the receiving seat, and the leaf spring is provided independently for each of the two screws, Even if there is a difference in the position of the tip, the inclination of each leaf spring does not become so large, each leaf spring does not exert a considerable spring force on each screw, and azimuth adjustment can be performed without receiving extra force. it can.

[Brief description of drawings]

1 is a sectional view showing an azimuth mechanism of a tape reproducing apparatus according to the present invention, FIG. 2 is a plan view of FIG. 1, FIG. 3 is a plan view of a leaf spring of FIG. 1, and FIG. FIG. 5 is an end view seen from the arrow IV in the figure, and FIG. 10 …… Chassis base, 12,14 …… Take-up reel, 16
...... Pinch roller, 18 ...... Capstan, 20 ...... Magnetic head, 22 ...... Head base, 24 ...... Slide lever, 26,28
...... Post, 30 …… Support plate, 34 …… Cam plate, 36 …… Rod, 38 …… Stopper, 40,42 …… Azimuth adjusting screw, 44 …… Reception seat, 46,48 …… Leaf spring.

Claims (1)

[Scope of utility model registration request] 1. A cam plate for adjusting an angle of a reproducing head supported by a head base, the cam plate being slidably arranged on a post, and having a height for adjusting azimuth according to a tape running direction. Has two screws for adjustment,
According to the rotation position of the cam plate,
A receiving seat for receiving one end of each of the screws is formed.
A leaf spring is inserted between the tip of each screw and the receiving seat, and the leaf spring is provided independently for each of the two screws. Azimuth mechanism.