JPS647497Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a transducer or head feeding device in a flexible magnetic disk drive device (floppy disk device) or the like.

In a floppy disk device, the recording or reproducing head must be accurately moved in the radial direction of the disk. For this purpose, the head is attached to a carriage (transport stand), the carriage is guided by a cylindrical guide shaft, and the stepping motor and the carriage are connected by, for example, an α-wound steel belt or a loop steel belt, and the stepping motor is The carriage is configured to move in the radial direction of the disk following the drive of the motor.

By the way, if there is a large clearance between the through hole of the carrier and the guide shaft, the azimuth of the head, index timing, and track position accuracy will deteriorate. On the other hand, if the clearance is small, the load on the stepping motor for feeding will become large and the stepping motor will become unstable. The angular accuracy of the ping motor cannot be guaranteed. For this reason, the relationship between the through hole and the guide shaft is extremely important. However, when the carrier is made of synthetic resin in order to reduce its weight, it is difficult to form a perfect circular through hole for inserting the guide shaft. In other words, if a molding die corresponding to a through hole is formed into a perfect circle and then injection molded, the stress distribution of the molding material itself is not uniform, so deformation occurs when it is removed from the mold, and the cross-sectional shape of the through hole becomes an ellipse. Summer. For this reason, it is conceivable to form the mold into an ellipse in advance, but it is extremely difficult to process the mold into an ellipse so as to obtain the required perfect circle. Additionally, if both the through hole and the guide shaft are circular, the contact area between them will be large, and if the relationship between them changes due to temperature, the sliding characteristics will change, making it difficult to feed smoothly and accurately. It became difficult. still,
The above-mentioned problems also occur when the carrier is not made of synthetic resin and in disk devices other than floppy disk devices.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a transducer feeding device that allows accurate and smooth feeding and can be easily formed.

To achieve the above object, the present invention includes a transducer carrier having a through hole, a guide shaft having a circular outer circumferential surface inserted into the through hole to guide the carrier in the radial direction of the medium disk. , a feeding device for a recording or reproducing transducer, comprising a feeding drive device for feeding the carrier in the radial direction of the disk along the guide shaft, wherein the through hole is formed to have a polygonal wall surface. The size of the through hole is set so that all wall surfaces of the polygon are in contact with the guide shaft, and a pressure spring is provided for pressing the wall surface against the guide shaft. The present invention relates to a feeding device for a recording or reproducing converter, which is characterized in that it does not have a recording or reproducing converter.

The present invention has the following effects.

(b) Since the through-hole is formed so that all the polygonal walls are in contact with the guide shaft, which has a circular outer peripheral surface, there is no need to provide a spring to press the converter carrier in a certain direction against the guide shaft. Become.

(b) Since no pressure spring is provided, the load on the feed drive device can be reduced.

Next, a transducer feeding device for a floppy disk device according to an embodiment of the present invention will be described with reference to FIGS. 1 to 9.

In FIG. 1 schematically showing a floppy disk device, 1 is a recording medium disk, 2 is a disk drive motor for rotating the disk 1, 3 is a disk rotating table, 4 is a clamper, and 5 is a disk 1.
a clamper support arm for separating the clamper 4 from the rotary table 3 during attachment and detachment; 6 is a magnetic head as a recording/reproducing converter; 7 is a head carrier; 8
9 is a guide cylindrical shaft, and 9 is a stepping motor for feeding that is connected to the carrier with a steel belt. The present invention relates to a radial feed mechanism for the head 6 in the apparatus of FIG.

In FIG. 2, which shows in detail the feeding mechanism of FIG. 1, the head 6 is mounted on a carrier 7 made of synthetic resin made of polyphenyl sulfide so as to be in contact with the lower surface of the floppy disk 1. A mounting hole 10 is provided on the upper surface of the right end of the carrier 7 in FIG. 2 in order to attach the head carriage supporting the upper head which is brought into contact with the upper surface of the disk to the carrier 7.

As is clear from FIGS. 3 and 4, the transport platform 7 is provided with a through hole 11 having a rectangular cross section.
is loosely fitted. Further, the other guide cylindrical shaft 14 is inserted into a U-shaped groove 13 in a protrusion 12 provided on the carrier 7.

In order to easily and accurately fix the shafts 8, 14 after the transport platform 7 and the shafts 8, 14 are engaged, the pair of shafts 8, 14 are mounted on a support substrate 15 made of aluminum die-casting as shown in FIG. Groove 1 corresponding to the interval
6 is provided, and a pair of shafts 8, 1 are provided on the wall of this groove 16.
4 is positioned and fixed with a mounting bracket 17.

In order to send the carrier 7 guided by the shafts 8 and 14 in the radial direction by the motor 9, an engaging part 18 is integrally provided on the side surface of the carrier 7, and the pulley 1 of the motor 9
9 and this engaging portion 18 are connected by a known α-wound steel belt 20.

Although the carrier 7 has a thickness equal to or greater than the height of the rectangular through hole 11 for inserting the shaft 8, it does not have a synthetic resin layer corresponding to the entire thickness, and as shown in FIGS.
As shown in the figure, it is formed to have a rim 21 to reinforce the main surface portion 22, and rims 21a, 2 at both left and right ends.
A rectangular through hole 11 is provided in 1b. Further, although an opening 23 is provided in the main surface portion 22, a rim 21 is arranged to correspond to the opening 23, and a decrease in strength is prevented.

The mold corresponding to the through hole 11 when forming the transport platform 7 by injection molding of synthetic resin is a diamond-shaped mold 24 as shown in FIG. Even if the diamond-shaped mold 24 is used in this way, due to the stress distribution of the molding material, the square through-hole 11 shown in FIG.
is obtained. If a proper relationship between the mold 24 and the through hole 11 cannot be obtained, the mold 24 is corrected. In this case, since the correction surface is not a circular or elliptical outer peripheral surface as in the conventional case, but a quadrangular surface, it is possible to easily obtain a desired mold.

As is clear from the above, this embodiment has the following advantages.

(a) The through hole 11 is made into a quadrangle, and a pair of opposing vertices of this quadrangle are located on a vertical line, and the remaining pair of opposing vertices are located on a horizontal line, and the cylindrical shaft 8 is formed at four points. Since the cylindrical shaft 8 is brought into contact with the through hole 11, the contact surface of the cylindrical shaft 8 with the through hole 11 is reduced, and the sliding characteristics are improved. Therefore, even if the through hole 11 contracts due to temperature changes, the sliding characteristics will not deteriorate much.

(b) Since the carrier 7 is made of synthetic resin, it is deformed due to stress and the through hole 11 has the same shape as the mold.
Even if it is not possible to obtain the desired shape, since the mold 24 is square, it is possible to easily form the mold 24 corresponding to the through hole 11 of the desired shape.

(c) The carrier 7 is made of synthetic resin, and the rim 21 is
Because of this configuration, the weight of the carrier 7 can be reduced, and the stepping motor 9 can be made smaller.

(d) Since the shafts 8 and 14 are fixed using the groove 16 of the substrate 15 and a common metal fitting 17 having an inclined pressing surface, it is possible to attach them easily and accurately.

Although the embodiments of the present invention have been described above, the present invention is not limited thereto and can be further modified. For example, it can be applied to a head feeding mechanism of an optical video disc device. Further, the through hole 11 may be formed into a polygon other than a square.

[Brief explanation of the drawing]

FIG. 1 is a front view schematically showing a floppy disk device according to an embodiment of the present invention, and FIG.
3 is a sectional view showing part of the - line in FIG. 2, FIG. 4 is an enlarged sectional view of the through hole portion in FIG. 2, and FIG. Fig. 4 is a cross-sectional view showing the mold for obtaining the through hole, Fig. 6 is a bottom view of the carrier shown in Fig. 2, and Fig. 7 is the - of Fig. 6.
A cross-sectional view showing a part of the line, Fig. 8 is a - of Fig. 6.
A cross-sectional view showing a part of the line, FIG. 9 is a - of FIG. 2.
It is a sectional view showing a part of a line. In the symbols used in the drawings, 1 is a disk, 7 is a carrier, 8 is a guide cylinder shaft, and 11 is a through hole.

Claims (1)

[Claims for Utility Model Registration] A transducer carrier having a through hole, a guide shaft having a circular outer circumferential surface inserted into the through hole so as to guide the carrier in the radial direction of the medium disk, and the carrier A feeding device for a recording or reproducing transducer comprising a feeding drive device for feeding a base in a radial direction of the disk along the guide shaft, wherein the through hole is formed to have a polygonal wall surface. , the size of the through hole is set so that all wall surfaces of the polygon are in contact with the guide shaft, and no pressure spring is provided for pressing the wall surface against the guide shaft. A feeding device for a recording or reproducing converter.