JPH01158678A - Magnetic disk recording and reproducing device - Google Patents

Abstract

PURPOSE:To reduce a backlash by advancing and retracting a magnetic head feed and to improve a feed accuracy by using a square hole or a V groove and a ball as the sliding guide of the magnetic head holding member of a magnetic head feeding mechanism. CONSTITUTION:The two balls 18 are placed on the two square holes 17 provided on the base chassis 16 of a magnetic disk recording and reproducing device to make the ball abut against the square hole 20 of the magnetic head holding member 19. Further, the head holding member 19 is arranged so as to abut a needle 21 incorporated in the head holding member 19 against the lead screw 23 of a stepping motor 22 and a leaf spring 24 for energizing the head holding member 19 to the chassis 16 is fastened to the chassis by a machine screw 27. At this time, the ball 18 is interposed between a square hole 25 disposed in parallel to the square hole 20 of the head holding member 19 and the leaf spring 24. According to a different method, the V grooves 28, 29, 30 and used in place of the square holes 17, 20, 25.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a magnetic disk recording/reproducing device used in various office automation equipment.

BACKGROUND OF THE INVENTION In recent years, magnetic disk recording and reproducing devices have been rapidly progressing as they are simple, highly reliable, and low-cost random access memories, and their application fields have expanded to include office automation equipment and pan controllers.

A general magnetic disk recording/reproducing apparatus as described above will be explained below with reference to the drawings.

FIG. 4 shows a conventional general magnetic disk recording/reproducing apparatus. In FIG. 4, 1 is a magnetic disk for recording and reproducing information, and 2 is a magnetic disk cartridge that rotatably supports and stores the magnetic disk 1. 3
is a loading mechanism that sets the cartridge 2 in the recording/playback position of the main body of the apparatus. 4 is a magnetic disk rotation drive mechanism υ that rotates the magnetic disk 1, and a motor 6
Driven through the belt et al. A magnetic head 7 is placed in contact with the surface of the magnetic disk 1. Reference numeral 8 denotes a magnetic head moving mechanism for moving the magnetic head in the radial direction of the magnetic disk 1. Reference numeral 9 denotes a control circuit section composed of an electric circuit that controls recording or reproduction on the magnetic disk 1 by the magnetic head, and controls the magnetic disk rotation drive mechanism 4 and the magnetic head feeding mechanism 8.

The operation of the magnetic disk recording/reproducing apparatus configured as described above will be described below.

First, the magnetic disk cartridge 2 is loaded into the loading mechanism 3.
It is set to the recording/playback position on the main body of the device. Next, the magnetic disk 1 is rotated by the magnetic disk rotation drive mechanism 4. Then, the magnetic head 7 is moved in the radial direction of the magnetic disk 1 by the magnetic head transport mechanism 8 and stops at a predetermined recording or reproducing position. Next, information is recorded or reproduced on the magnetic disk 1 through the magnetic disk 7 according to an electric signal from the control circuit section 9 .

FIG. 6 shows a conventional magnetic head transport mechanism, and FIG. 6 shows a cross section thereof. A guide shaft 11 for guiding the magnetic head holding member 1Q in the sliding direction and a needle 1
2. The magnetic head holding member 1o composed of a leaf spring 13 is driven in the sliding direction by a stepping motor 14 and a lead screw 15.

Regarding the magnetic head feeding mechanism configured as above,
The operation will be explained below. First, when a step signal is input from the control circuit section 9 to the stepping motor 14, the lead screw 16 rotates in the forward or reverse direction. Needle 1 attached to magnetic head holding member 10
2 is disposed at the thread root of the lead screw 16 and is biased against the lead screw 16 by the leaf spring 13, so that the rotational movement of the lead screw 16 causes the magnetic head holding member 1o to slide in the direction of guide shaft 11. In this case, sliding frictional resistance occurs due to the sliding movement of the magnetic head holding member 10 and the guide shaft 11, and a large backlash occurs in the forward and backward movement of the magnetic head.

Furthermore, since a gap is created between the guide shaft 11 and the fitting hole of the magnetic head holding member 1o, the magnetic head holding member 10 is tilted as the magnetic head moves back and forth, causing backlash. This has caused a problem in that it has an adverse effect on the magnetic head feeding accuracy.

The present invention has been made in view of the above-described conventional example, and an object of the present invention is to provide a magnetic disk recording/reproducing device that reduces backlash that occurs during magnetic head feeding and has excellent magnetic head feeding accuracy.

Means for Solving the Problems In order to achieve the above object, the magnetic disk recording/reproducing apparatus of the present invention provides a magnetic head holding member with at least two square holes or V-shaped grooves extending in the sliding direction of the magnetic head holding member. A ball is provided at opposing positions of the magnetic head holding member and the base chassis, and a ball is placed between the square hole or V-shaped groove of the magnetic head holding member and the square hole or V-shaped groove of the base chassis. Parallel to the two square holes or V-shaped grooves, another square hole or V-shaped groove is provided in this magnetic head holding member, and the other square hole or V-shaped groove and this magnetic head holding member are attached to the base chassis. The ball is arranged between the plate spring and the leaf spring for biasing the ball.

Effects Since the present invention moves by rolling the ball due to the above-described structure, the backlash that occurs when the magnetic head is fed is reduced.

Example What is the overall structure of a magnetic disk recording/reproducing device?

It is substantially the same as that shown in FIG. 4, and only the features of the present invention will be described below with reference to the drawings.

A plan view of an embodiment of the present invention is shown in FIG. 1, a cross-sectional view using a square hole is shown in FIG. 2, and a cross-sectional view using a V-shaped groove is shown in FIG.

In FIGS. 1 and 2, two balls 18 are placed on two square holes 17 in the base chassis 16, and the balls 18 and the square holes 2o of the magnetic head holding member 19 are brought into contact with each other.
and a needle 21 incorporated into the magnetic head holding member 19
The magnetic head holding member 19 is arranged so as to contact the lead screw 23 of the stepping motor 22, and a plate spring 24 for biasing the magnetic head holding member 19 against the base chassis 16 is fastened to the base chassis with screws 27.

At this time, a ball is interposed between the square hole 26 provided in parallel to the two square holes 20 of the magnetic head holding member 19 and the plate spring 24.

FIG. 3 is a sectional view of an embodiment that is substantially the same in structure as the embodiment described above, but uses a V-shaped groove in place of the square hole of the embodiment described above. The V-shaped grooves 28°29.30 correspond to the square holes 17°20.25 in the above embodiment, respectively.

Effects of the Invention As described above, the magnetic disk recording/reproducing device of the present invention uses square holes or V-shaped grooves and balls as sliding guides for the magnetic head holding member in the magnetic head feeding mechanism, so that forward and backward movement of the magnetic head is controlled. This makes it possible to significantly reduce backlash due to

[Brief explanation of the drawing]

FIG. 1 is a plan view showing a magnetic head feeding mechanism according to one embodiment of the present invention, FIG. 2 is a partial cross-sectional view of the same essential part, and FIG. 3 is a V-shaped instead of a square hole. FIG. 3 is a partial cross-sectional view of a main part using grooves. FIG. 4 is a perspective view of a conventional general magnetic disk recording/reproducing device, and FIG. 6 is a plan view of the same magnetic head feeding mechanism. FIG. 6 is a partial sectional view of the same essential part. 1...Magnetic disk, 2...Magnetic disk cartridge, 3...Loading mechanism,
4...Magnetic disk rotation drive mechanism, 5...
...Motor, 6...Belt, 7...Magnetic head, 8...Magnetic head feeding mechanism, 9...
... Control circuit section, 1Q ... Magnetic head holding member, 11 ... Guide shaft, 12 ... Needle, 13 ... Leaf spring, 14 ...Stepping motor, 16.Lead screw, 16.Base chassis, 17.Square hole, 18.Mark, ball, 19.Magnetism. Head holding member, 2o... Square hole, 21... Needle, 22... Stepping motor, 23...
... Lead screw, 24 ... Leaf spring, 26
... Square hole, 26 ... Ball, 27 ...
Mark/screw +28... V-shaped groove, 29...
V-shaped groove, 30...V-shaped groove. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2 Figure 3 Broom 4 Figure 5 Figure 4 Sliding 7 questions Figure 6

Claims (1)

[Claims] (1) At least two square holes or V-shaped grooves extending in the sliding direction of the magnetic head holding member are provided at opposing positions on the magnetic head holding member and the base chassis below the magnetic head holding member. A ball is arranged between the square hole or V-shaped groove of the magnetic head holding member and the square hole or V-shaped groove of the base chassis. A magnetic disk recording/reproducing device in which a V-shaped groove is provided in this magnetic head holding member and a ball is placed between another square hole or V-shaped groove and a leaf spring for biasing this magnetic head holding member against a base chassis. Device.