JPH0240623Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to magnetic disk storage devices.

In a magnetic disk storage device, the rotation of the output rotating shaft of a step motor is transmitted to an arm carrying a magnetic head to rotate the arm, thereby positioning the magnetic head on an arbitrary track of the magnetic disk. If play occurs in the connection between the motor and the output rotating shaft, it becomes impossible to accurately position the magnetic head on the track of the magnetic disk. If a split pin or adhesive is applied to the connecting portion in order to prevent such backlash, assembly and disassembly will become difficult, and the number of man-hours for manufacturing and maintenance will increase, which is not preferable.

This invention was made in view of the above points,
The purpose is to provide a magnetic disk storage device that can eliminate rattling, ensure accurate positioning of a magnetic head on a magnetic disk track over a long period of time, and is easy to manufacture and maintain. be.

According to the present invention, the object has an arm and a rotating shaft for positioning a magnetic head on an arbitrary track of a magnetic disk, and the rotating shaft is inserted into a hole formed in the arm. , the rotation shaft is provided with at least two protrusions provided on the inner wall of the hole at different positions with respect to the circumferential direction of the hole, and the rotation shaft is arranged in the circumferential direction of the hole in order to press the rotation shaft against each of the protrusions. This is achieved by a magnetic disk storage device being fixed to the arm by at least one screw provided on the inner wall at a different position from the respective position of the protrusion.

The present invention will be explained in more detail below based on preferred embodiments shown in the drawings.

In the figure, a pulley 4 is fixed to an output rotating shaft 3 of a step motor 2 fixed to a housing 1, a steel belt 5 is wound around the pulley 4, and both ends of the steel belt 5 are connected to screws 6 and 5, respectively. 7 to the T-shaped arm 8. The belt 5 and the pulley 4 are connected to each other by screws 9 so as not to slip. Bearings 10 and 11 attached to the case 1 rotatably support a rotating shaft 12, and an arm 8 is fixed to one end 13 of the shaft 12. The diameter 18 of the shaft 12 is attached to one end 17 of an arm 16 consisting of a plurality of arm parts 15 each carrying a magnetic head 14.
The through hole 20 has a diameter 19 slightly larger than that of the through hole 20, and the center 23 of the hole 20 is eccentric by a distance 22 from the center 21 of the hole 20, and the diameter 2 is smaller than the diameters 18 and 19.
a through hole 25 defined by a through hole 25 having a diameter of 4;
is formed. The hole 26 is thus connected to the hole 20
and a hole 25, its outer edge, more specifically a part of the inner wall constituting the outer edge, has two supports spaced apart with respect to the circumferential direction 27, that is, provided at different positions with respect to the circumferential direction 27. It is defined by respective protrusions 28 and 29, which are examples of parts. The other end side 30 of the shaft 12 is inserted into the hole 20 side of the hole 26, more specifically, the hole 20 side located on the opposite side of the hole 25 in the circumferential direction of the hole 26.
0 is the respective position of the protrusion 28 and the protrusion 29 and the hole 2
A screw 31, which is an example of a pressing member, is screwed into the side surface of one end 17 at different positions in the circumferential direction of 6.
and 32 are fixed to the one end portion 17. The screws 31 and 32 are arranged so as to press the other end side 30 of the shaft 12 against the protrusions 29 and 8, respectively. In other words, the other end side 30 of the shaft 12 has at least two protrusions 28 and 29 provided on the inner wall of the hole 26 at different positions in the circumferential direction of the hole 26.
In order to press the shaft 12 against these protrusions 28 and 29, respectively, one end 17 of the arm 16 is fixed by two screws 31 and 32 provided on the inner wall of the hole 26 at different positions in the circumferential direction. Fixed. Therefore, the shaft 12 constitutes a rotating shaft fixed and supported within the hole 26 in order to rotate the arm 16. In addition, 33
is a magnetic disk.

Magnetic disk storage device 4 configured in this way
0, when the motor 2 is activated and the shaft 3 is rotated in the A or B direction, this rotation of the shaft 3 is transmitted to the arm 8 via the pulley 4 and the belt 5, and the arm 8 is rotated in the C or D direction. This rotation of the arm 8 rotates the shaft 12 in the E or F direction, so that the arm 16 is also rotated in the C or D direction, and the magnetic head 14 rotates, for example, in the G direction. is located in a predetermined storage track of.

By the way, in the magnetic disk storage device 40, the hole 2
The other end side 30 of the shaft 12 inserted into the shaft 12 is pressed against the two protrusions 29 and 28 defining the hole 26 by screws 31 and 32 as pressing members, thereby causing the other end side 30 of the shaft 12 and the arm 16 to One end side 1
7 are firmly connected to each other, it is difficult for play to occur between the shaft 12 and the arm 16 in the direction of rotation, and the rotation of the shaft 12 can be directly transmitted to the arm 16, making it possible to maintain the magnetic head 14 in long-term use. can also be reliably positioned on a predetermined track of the magnetic disk 33. Also, assembly and disassembly can be done using screws 31 and 3.
This can be done by attaching and removing 2.

In the specific example described above, the present invention is applied to the connecting portion between the other end side 30 of the shaft 12 and the one end side 17 of the arm 16.
The through hole 8a of the arm 8 into which the one end 13 is inserted is also provided with projections similar to the projections 28 and 29.
The shaft 12 and the arm 8 may be firmly connected by using a screw similar to that shown in FIG.

In addition, the present invention is not limited to a magnetic disk storage device such as the specific example in which the rotation of the shaft 3 of the motor 2 is transmitted to the arm 16 via the arm 8 and the shaft 12; Therefore, the present invention is not limited to any specific example of a magnetic disk storage device.

As described above, according to the present invention, the rotating shaft is inserted into the hole defined by the inner wall provided with at least two protrusions at different positions in the circumferential direction, that is, spaced apart in the circumferential direction, and the rotating shaft is inserted into the hole defined by the inner wall. The insertion portion of the rotary shaft is pressed by at least one screw provided on the inner wall at a position different from the position of each of the projections in the circumferential direction of the hole so as to press the insertion portion of the rotating shaft against each of the projections. is,
This creates a strong connection between the rotating shaft and the arm, making it difficult for looseness to occur between the rotating shaft and the arm without using split pins or adhesives, ensuring accuracy even during long-term use. To ensure accurate positioning of the magnetic head, to facilitate assembly and disassembly, and to create many gaps (for example, gaps 41 and 42 shown in FIG. 3) at the connection between the upper arm and the rotating shaft. Therefore, the air flow through this gap can prevent the temperature of the connecting portion from rising, and further prevent the occurrence of backlash due to thermal expansion of the connecting portion.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a preferred embodiment of the present invention;
Figure 2 is an exploded explanatory diagram of the specific example shown in Figure 1;
The figure is a detailed cross-sectional view of the connecting portion between the arm and the shaft shown in FIG. 1. 12... Rotating shaft, 14... Magnetic head, 16...
...Arm, 26...Through hole, 28, 29...Protrusion, 31, 32...Screw.

Claims (1)

[Scope of utility model registration request] It has an arm and a rotating shaft for positioning the magnetic head on an arbitrary track of the magnetic disk, and the rotating shaft is inserted into a hole formed in the arm, and the rotating shaft is inserted into a hole formed in the arm. at least two protrusions provided on the inner wall of the hole at different positions in the circumferential direction; a magnetic disk storage device fixed to the arm by at least one screw provided on the inner wall;