JPH0313915Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to a magnetic head support mechanism for an apparatus that performs recording and/or reproduction by pressing a magnetic head against a card-like recording medium such as a magnetic card or a form.

Conventionally, in order to improve the positional accuracy of the magnetic head and, for example, a pad roller that opposes it, the dimensional accuracy of related parts has been increased. However, since there is some play in the rotational fulcrum of the head arm that supports the magnetic head, no matter how good the dimensional accuracy of other parts is, this play weakens the pressing force between the recording medium and the magnetic head, and the magnetic This causes a reduction in head output and a deterioration in signal reading accuracy. In addition, the magnetic head and pad roll must be completely opposed to each other, and it is known that if they are misaligned, a gap will be created in the contact area between the recording medium and the gap of the magnetic head, resulting in a decrease in output. ing. This problem becomes especially serious when the medium is thin like a paper card.

The purpose of this invention is to improve the positional accuracy of the magnetic head by substantially eliminating the play of the rotation fulcrum of the magnetic head support arm, and to stabilize the output of the magnetic head by improving the close contact between the medium and the magnetic head. It is an object of the present invention to provide a magnetic head support mechanism that provides a magnetic head support mechanism.

The above object of the present invention is achieved by providing the head support arm with a compression and torsion coil spring for urging the head support arm toward the magnetic head opposing member and toward the medium traveling direction.

This invention will be explained below with reference to the accompanying drawings. FIG. 1 is a schematic front view showing an example of a magnetic head support mechanism according to this invention, and FIG. 2 is a schematic right side view thereof. The magnetic head 1 is mounted on cut-and-raised portions 2a and 2b of the head mounting plate 2 as shown in FIG.
It is clamped and fixed. This head mounting plate 2
cut and raised portion 2 on one side of
On both sides of a and 2b, there are pins 4 and 5 whose bases are semispherical.
is fixed. The pins 4 and 5 are loosely fitted into holes 7 and 8 provided on both sides of the lower part of a head support arm 6 formed in an inverted U shape so as to straddle the magnetic head 1. The holes 7, 8 have a hemispherical surface on one side, and the hemispherical portions of the pins 4, 5 engage therewith. Bent edges 6a and 6b are formed on both sides of the upper part of the head support arm 6, and a support shaft 11 is inserted into holes 9 and 10 provided in these edges.
is rotatably inserted. One end of the support shaft 11 has a small diameter portion 11a, and this portion 11a is rotatably inserted into a hole 10 in one of the projecting edges 6b of the head support arm 6. This support shaft 11 is rotatably supported by projecting edges 13a and 13b on both sides of a bracket 13, which is an immovable member screwed onto the frame 12. A thrust washer 14 made of graphite-containing nylon is interposed in a portion of the shaft 11 between the protruding edge 13a of the bracket 13 and the protruding edge 6a of the support arm 6. A coil spring 16 is provided around the shaft 11 between an E-ring 15 provided inside the bracket flange 13b of the shaft 11 and the inside of the other bracket flange 13a. This coil spring 16 is contracted in the direction of reducing its diameter, and one end 16a is attached to the bracket 1.
3, and the other end 16b is locked to the support arm 6, serving as both a compression coil spring and a torsion coil spring. Therefore, the spring 16 presses the E-ring 15, that is, the shaft 11, in the direction of the bracket flange 13b, and the shoulder portion of the shaft 11 that meets the small diameter portion 11a presses the flange 6b of the support arm, so that the other Support arm flange 6a
is pressed against the other bracket protrusion 13a via the thrust washer 14. In this way, the bracket protrusion 13a serves as a positioning portion that restricts the movement of the head support arm 6 in the medium advancing direction. On the other hand, both ends 16a, 1 of this coil spring 16
6b is locked to the bracket 13 and the support arm 6, respectively, so that the support arm 6 is connected to the shaft 1.
1 in the counterclockwise direction, and the magnetic head 1 is pressed against the pad roller 3 via the pins 4 and 5 of the head mounting plate 2.

As shown in FIG. 2, the pad roller 3 includes a ball bearing 18 fixed to a drive shaft 17, a core bar 3a fixed to the outer periphery of the ball bearing 18, and a rubber layer 3b coated on the outside. The magnetic card 19 runs on the lower part between the pad roller 3 and the magnetic head 1 and has a reference surface 2.
0, the feed roller 21 is fixed to the drive shaft 17, and the opposing roller 22 presses against the feed roller 21 and follows the feed roller 21. It is transported in the A direction.

When the magnetic card 19 is conveyed in the direction A, the magnetic head 1 is pressed toward the pad roller 3 by the coil spring 16, so that the magnetic card 1
The magnetic head 1 is brought into close contact with the magnetic head 9. At this time, due to the play between the inner ring and outer ring of the ball bearing 18 in the pad roller 3 and the ball connection between the pins 4 and 5 of the head mounting plate 2 and the holes 7 and 8 of the head support arm 6, the pad roller 3 and the magnetic head 1 are Since each magnetic card 19 can be slightly oscillated, even if the magnetic card 19 is bent or the like, the magnetic card 19 can be transported without losing its adhesion to the magnetic head 1. Furthermore, since the spring 16 absorbs the play in the support part in the conveying direction A, the positional accuracy of the head gap of the magnetic head 1 relative to the pad roller 3 can be improved, and the transmission accuracy and output of the magnetic head 1 can be stabilized. It can be measured.

In the above embodiment, the spring 16 presses the support shaft 11 in the traveling direction A of the magnetic card 19, thereby bringing the support arm 6 into pressure contact with the bracket 13. In the embodiment, one end 16b of the spring 16 is
In another embodiment shown in FIG. 5, the pin 5 of the head mounting plate 2 is
The support arm 6 is hooked on the inside of the support arm 6 and is adapted to directly press the support arm 6 in the medium traveling direction A side by the spring 16. By increasing the spring constant of the spring 16, the support arm 6 may be pressed upstream in the medium traveling direction A.

As described above, the magnetic head support mechanism according to this invention presses and urges the magnetic head support arm in both directions, toward the magnetic head opposing member and the medium traveling direction, using a single coil spring that serves both compression and torsion. With a simple configuration, play in the magnetic head support can be virtually eliminated, improving the positional accuracy of the magnetic head, ensuring close contact between the medium and the magnetic head, and stabilizing the output of the magnetic head. It can be measured.

[Brief explanation of the drawing]

FIG. 1 is a schematic front view showing an example of the magnetic head support mechanism according to the invention, FIG. 2 is a schematic right side view thereof, and FIG. 3 is a perspective view of the magnetic head mounting plate in the embodiment shown in FIG. , 4 and 5 are schematic partial front views showing another embodiment of this invention. 1...Magnetic head, 2...Head mounting plate, 3...
...Pad roller, 4, 5...Pin, 6...Head support arm, 11...Support shaft, 12...Frame, 13...Bracket, 14...Thrust washer, 15...E ring, 16...Coil spring, 19...Magnetic card, A...Media traveling direction.

Claims (1)

[Claims for Utility Model Registration] A head mounting plate that holds a magnetic head and has pins on both sides of the magnetic head in the direction in which the medium travels; and a head mounting plate that is loosely fitted to the pins and is rotatable around an axis along the direction in which the medium travels. a head support arm supported by the head support arm; a coil spring capable of both compression and torsion provided around the shaft for pressing and biasing the head support arm toward the magnetic head opposing member and toward the medium traveling direction; a magnetic head support arm positioning portion provided on the member, with which a portion of the head support arm comes into contact with the head support arm by pressing force in the medium travel direction, and determines the position of the head support arm in the medium travel direction; Head support mechanism.