JPH0333932Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a reversing magnetic head device used in an auto-reversing tape recorder.

2. Description of the Related Art Auto-reverse tape recorders are already well known, which automatically switch the running direction of a magnetic tape so that recording or playback can be performed even when the magnetic tape runs in either the left or right direction. This type of tape recorder has a method in which a pair of magnetic heads are brought into contact with the magnetic tape at the same time, and one head is used alternatively by switching a switch depending on the running direction of the magnetic tape. There is a method in which the position of the core gap is changed in the width direction of the tape by moving the magnetic head in accordance with the running direction of the magnetic tape. moreover,
There are two methods of moving a single magnetic head: one that moves the magnetic head up and down, and one that rotates it 180 degrees to change the height of the core gap.

The present invention relates to a reversing magnetic head device for an auto-reversing tape recorder in which each magnetic head is rotated by 180 degrees.

Generally, in this type of device, a rotating plate with a magnetic head attached is rotatably attached to a head base, and the head base is moved forward to bring the magnetic head into contact with the magnetic tape. When the magnetic head is moved backward to separate it from the magnetic tape, the rotary plate is rotated 180 degrees in conjunction with this movement.

Therefore, in this type of device, the magnetic head moves forward and backward and rotates, so the lead wire connected to the terminal of the magnetic head changes its degree of curvature and is also subjected to twisting force, causing the magnetic head to move forward and backward and rotate. There was a problem where the connection between the terminal and the lead wire easily broke.

The present invention was developed based on these circumstances, and its purpose is to attach a magnetic head to a movable head base via a rotary plate, and to reverse the magnetic head with the head base retracted. In such a reversible magnetic head device, it is an object of the present invention to reliably prevent the connection between the terminal of the magnetic head and the lead wire from breaking.

In order to achieve the above object, the reversible magnetic head device of the present invention is provided with two sets of movable contacts that rotate together with the rotary plate, and connects the two sets of movable contacts to the terminals of the magnetic head. An elastic contact piece is attached to the base, a lead wire is connected to the contact piece, and the contact piece is configured to alternately contact each set of movable contacts as the magnetic head is reversed.

For this reason, the rotation of the rotating plate is not transmitted to the lead wires, and therefore no twisting force is applied to the lead wires, which eliminates the conventional problem of easy disconnection between the lead wires and the magnetic head. It will be resolved.

1 to 5 show an embodiment of the present invention, in which 1A is a recording/playback magnetic head;
B is the erase head, 2 is these heads 1A, 1B
3 is a rotary plate to which the head support 2 is attached, and 5 is a head base. The head base 5 is mounted on a tape recorder board (not shown) so as to be movable forward and backward. Also, the core gap 6 of the magnetic head 1A for recording and playback.
is located away from the center of rotation O of the rotary plate 3, and the dimension between the center O of the rotary plate 3 and the core gap 6 is set to 1/2 of the distance between the channel centers of the two-channel magnetic tape. .

The head support 2 is attached to one surface of the rotary plate 3, and a support shaft 7 is fixed perpendicularly to the axis of the rotary plate 3 at the center of the other surface of the rotary plate 3. . On the other hand, the head base 5 is provided with a through hole 9 through which the support shaft 7 is inserted.
Note that a tape guide 10 is integrally formed with the head support 2.

Three steel balls 11 and a spacer 13 for holding the steel balls 11 at equal intervals are inserted between the rotating plate 3 and the head base 5. Furthermore, a pair of locking pieces 15A, 1 are provided on one side of the rotating plate 3.
5B is formed by bending. Azimuth screws 17A and 17B are screwed into one side of the head base 5 to abut the locking pieces 15A and 15B, respectively, so as to restrict the rotation range of the rotating plate 3 to 180 degrees. . In addition, 18A and 18B in the figure are compression coil springs for stabilizing each azimuth screw 17A and 17B.

A gear 19 is fixed to the shaft end of the support shaft 7 on the back side of the head base 5.
A compression coil spring 21 is inserted between the head base 5 and the head base 5 in a somewhat compressed state. Further, a sector gear 23 is rotatably supported on the head base 5, and this sector gear 23 meshes with the gear 19. A toggle spring 25 is installed between the sector gear 23 and the gear 19, and the elasticity of the toggle spring 25 causes one of the locking pieces 15A of the rotating plate 3 to be fixed to one of the azimuth screws 17A as shown in FIG. Alternatively, as shown in FIG. 4, the other locking piece 15B is configured to abut the other azimuth screw 17B.

At least one surface of the rotating plate 3 is coated with an insulating coating, and two sets of movable contacts 27a, 27b, 27 are provided at the peripheral edge of the one surface coated with the insulating coating.
c, 27d, 27e, 27f and 28a, 28
b, 28c, 28d, 28e, and 28f are arranged in parallel in the circumferential direction of the rotating plate 3 as shown in FIG. Then, each of these two sets of movable contacts (for example, 27
a and 28a), and the two movable contacts 27a and 28a forming the pair are in a positional relationship that is point symmetrical with respect to the central axis of the rotary plate 3, and they are printed on the insulating coating surface. It is commonly connected to the terminal of the magnetic head 1A or 1B via a wiring 29. Thus, the rotating plate 3 is connected to the magnetic head 1.
It is a mounting member for mounting A and 1B, and also serves as a printed circuit board.

Further, the magnetic head 1 is mounted on the head base 5.
Elastic contact pieces 30a, 30b, 30c, 30d, 30 corresponding to all terminals A and 1B on a one-to-one basis
e, 30f are attached. These contact pieces are connected to any set of movable contacts 27 as shown in FIG.
a, 27b, . . . or 28a, 28b, .
This is what connects the . In addition, numeral 32 in the figure is a plate-shaped mounting member for mounting the contact pieces 30a to 30f on the rotary plate 3. In addition, contact pieces 30a to 30f
is in pressure contact with the rotary plate 3 from the head mounting surface side, supplements the compression coil spring 21, and applies an elastic force to the rotary plate 3 in the direction of pressing the rotary plate 3 against the head base 5. It also has functions.

In the head reversal operation of the reversible magnetic head device configured as described above, the head base 5 retreats and the pinch rollers (not shown) located on the left and right sides of the magnetic head 1A are moved relative to the capstan shaft (not shown). When the switch is moved away, the drive mechanism operates in conjunction with the switching operation. After the sector gear 23 rotates as shown by the arrow in FIG. 3 and the rotating plate 3 rotates 180 degrees, the head base 5 moves forward again, changing from the state shown in FIG. 1 to the state shown in FIG. 4.

Since the rotary plate 3 is pressed against the front surface of the head base 5 via the three steel balls 11 by the elastic force of the compression coil spring 21 and the elastic contact pieces 30a to 30f, it is always held stably and rotated. The magnetic head 1A attached to the plate 3 also does not wobble.

Further, as the rotary plate 3 rotates, one set of movable contacts 27a to 27f moves to the elastic contact pieces 30a to 30.
The other set of movable contacts 28a to 28f apart from f
comes into contact with the elastic contact pieces 30a to 30f. Since the elastic contact pieces 30a to 30f to which the lead wire 31 is connected are fixed to the head base 5, the lead wire 31 only changes its degree of curvature as the head base 5 advances and retreats. Rotation of the plate 3 does not cause twisting. Therefore, breakage of the lead wire 31 can be prevented.

As detailed above, according to the present invention, two sets of movable contacts that rotate together with the rotating plate are provided, the two sets of movable contacts are connected to the terminals of the magnetic head, and an elastic contact piece is attached to the head base. A lead wire is connected to the contact piece, and the contact piece is configured to alternately contact each set of movable contacts as the magnetic head is reversed. Therefore, the lead wires are not twisted by the rotation of the rotary plate, and therefore there is no problem of breakage of the lead wires or disconnection between the lead wires and the magnetic head.

In the above embodiment, the rotary plate 3 is a printed circuit board, but for example, the support shaft 7 is a hollow shaft, a printed circuit board is attached to the side surface of the gear 19, and the printed wiring formed on the printed circuit board and the magnetic The terminals of the heads 1A and 1B may be connected through the support shaft 7.

[Brief explanation of the drawing]

The figures show an embodiment of the present invention, in which Figs. 1 and 4 are front views, Fig. 2 is a plan view showing the head base and spacer in cross section along the - line in Fig. 1, and Fig. The figure is a rear view of FIG. 2 seen from the direction of the arrow, and FIG. 5 is a sectional view taken along the - line of FIG. 1. 1A... Recording/playback head, 3... Rotating plate, 5
...Head base, 27a-27f, 28a-28
f...Movable contact, 29...Printed wiring, 30a
~30f...Elastic contact piece, 31...Lead wire.

Claims (1)

[Scope of claims for utility model registration] (1) A rotating plate with a magnetic head attached to one surface,
A head base that supports this rotary plate so as to be able to reciprocate within a range of 180 degrees, brings the magnetic head into contact with the magnetic tape in a forward motion, and separates the magnetic head from the magnetic tape in a backward motion; two sets of movable contacts are provided on orthogonal planes so as to be point symmetrical with respect to the central axis thereof, and each set is connected to a terminal of the magnetic head;
A reversible magnetic head comprising an elastic contact piece to which a lead wire is connected and which is fixed to the head base and selectively contacts one of the sets of movable contacts as the rotary plate rotates. Device. (2) The reversible magnetic head device according to claim 1, wherein the rotary plate is a printed circuit board having movable contacts attached thereto. (3) The elastic contact piece applies an elastic force to the printed circuit board in the direction of pressing the printed circuit board against the head base. ) The reversible magnetic head device according to item 1.