JPS63136363A - Magnetic recording device - Google Patents

Abstract

PURPOSE:To obtain an inexpensive magnetic recorder with high reliability and mass-productivity by adopting the structure such that the offset is made adjustable so as to allow the relevant element dimension accuracy and assembling accuracy. CONSTITUTION:A magnetic head 1 is mounted on a carriage 2 and the carriage 2 is held slidably to a guide shaft 3 whose cross section is circular. Pillar projections 3a, 3b at both ends of the guide shaft 3 are cylinders provided incorporatedly with the guide shaft 3, each shaft center is made nearly coincident and deviated from the shaft center of the guide shaft 3. Bearings 4a-4d are provided to the base 4, the pillar projection 3a is fitted to the bearing 4a, the shaft 3c is to the bearing 4c, the pillar projection 3b is to the bearing 4b and the shaft 3d is pressed and fixed to the bearing 4d by a retainer plate 5 having an elasticity respectively. Thus, the variable range of the guide shaft 3 is set freely by the outer diameter of the guide shaft 3, the outer diameter of the pillar projections 3a, 3b and the eccentricity of the guide shaft 3 and the pillar projections 3a, 3b. Thus, the accuracy of dimension and assembling is all absorbed in relation to the components relating to the offset and the offset is adjusted to a target value.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic recording device that uses a magnetic disk as a recording medium, and more particularly to a guide shaft fixing structure for guiding a carriage.

[Conventional technology]

A side sectional view of the main part of a conventional magnetic recording device is shown in FIG.
In FIG. 2, the magnetic head 21 is mounted on a carriage 22, the carriage 22 is held by a guide shaft 23 so as to be able to slide in the radial direction of the magnetic disk 25, and the guide shaft 23 is fixed to a base 24. . Carriage 22
A spring 28 and an upper carriage 29 are supported in order to press the magnetic disk 25 against the magnetic head 21, and the magnetic disk 25 is held by a hub 27 inserted into the main shaft 3o of the spindle motor 26, so that the magnetic disk 25 is held by a hub 27 that is blown into the main shaft 3o of the spindle motor 26, and rotates with the rotation of the spindle motor 26. It rotates as a unit.

The relative position of the magnetic head 21 in the circumferential direction of the magnetic disk 25 (hereinafter referred to as offset) is the fixed part position of the guide shaft 23 of the base 24, the mounting position of the spindle motor 26, and the main axis of the spindle motor 26. 30 positions,
This structure is determined by the dimensional accuracy and assembly accuracy of individual components, such as the mounting position of the magnetic head 21 on the carriage 22.

By setting the offset at a required position, the performance of the magnetic recording device and compatibility with other magnetic recording devices are guaranteed.

[Problem that the invention seeks to solve]

However, in the above-mentioned conventional technology, the offset, which is important for the performance and compatibility of the magnetic recording device, is determined by the dimensional accuracy and assembly accuracy of the above-mentioned components, so these had to be manufactured with extremely high precision. The offset deviation is
A decrease in the function of the recording/reproducing section (read/write head) of the magnetic head 21 (referred to as azimuth loss) and a decrease in the function of the erase section (erase head) disposed in the magnetic head 21 together with the read/write head (remaining signal erased) Therefore, the dimensional accuracy of the above-mentioned components must be suppressed to a variation of several microns to several tens of microns, resulting in a problem of extremely high costs. Furthermore, it goes without saying that unless the variation in the dimensional accuracy of the constituent elements is made zero or the related elements are selected and combined, the offset will inevitably vary from the target value.

Therefore, the present invention solves these conventional problems.
The purpose is to provide an inexpensive and highly reliable magnetic recording device that can be mass-produced, has a structure in which the offset can be adjusted, and can greatly improve the dimensional accuracy and assembly accuracy of related elements.

[Means for solving problems]

A magnetic recording device of the present invention has a structure in which a magnetic head is mounted on a carriage, the carriage is slidably held on a guide shaft having a circular cross-sectional shape, and the guide shaft is fixed to a base. , a columnar protrusion whose axis is eccentric from the axis of the guide shaft is integrally disposed at the shaft end of the guide shaft, and the base has a base bottom surface supporting the outer peripheral surface of the columnar protrusion. The guide shaft is characterized by comprising a substantially vertical receiving surface and a receiving surface substantially parallel to the bottom surface of the base that supports the shaft outer peripheral surface of the guide shaft excluding the columnar protrusion.

[Effect]

To describe the operation of the present invention, when the abutting position of the outer circumferential surface of the columnar projection is changed with respect to the receiving surface that is substantially perpendicular to the bottom surface of the base, the guide shaft is moved approximately toward the bottom surface of the base according to the amount of eccentricity. It moves along parallel receiving surfaces, and can freely adjust the offset of the magnetic head mounted on a carriage held by a guide shaft.

〔Example〕

Embodiments of the present invention will be described based on the drawings. FIG. 1 is a perspective view of the main part of a carriage showing an embodiment of the magnetic recording device of the present invention, FIG. 3(a) and FIG. It is a diagram. In FIG. 1, a magnetic head 1 is mounted on a carriage 2, and the carriage 2 is held by a guide shaft 3 having a circular cross-section with a force of tMvJvr. Columnar projections 3a and 3b at both ends of the guide shaft 3
are cylinders that are integrally provided with the guide shaft 3, and their respective axes substantially coincide with each other, and are eccentric from the axis of the guide shaft 3. The base 4 is provided with receiving parts 4a, 4b, 4c, and 4d.
b is fixed to the receiving part 4b, and the shaft part 3d is fixed to the receiving part 4d by pressure contact with the holding plate 5 having elasticity. The contact receiving surface of the columnar protrusion 3a of the receiving part 4a and the contact receiving surface of the columnar protrusion 3b of the receiving part 4b are substantially perpendicular to the bottom surface 4e of the base 4, and the contact receiving surface of the shaft part 3C of the receiving part 4C and the receiving part The contact receiving surfaces of the shaft portions 3d of the base 4 are arranged substantially parallel to the bottom surface 4e of the base 4,
Further, a groove 38 is provided on the end face of the columnar projection 3a. Incidentally, the carriage 2 is also held by an auxiliary guide shaft 6 so as not to rotate about the guide shaft 3.

As shown in FIGS. 3(a) and 3(b), when the guide shaft 3 is rotated by engaging, for example, a screwdriver in the groove 3e,
The guide shaft 3 and the columnar protrusion 3a are eccentric, and the shaft portion 3c is guided by the receiving portion 4c, and the other end of the guide shaft 3 has a similar structure and has the columnar protrusion 3b (th, lj (a), Figure 3 (b
) Since the shaft center (not shown) has approximately the same axis as the columnar projection 3a, the guide #i3 is aligned with the bottom surface 4e of the base 4.
It has a structure that allows it to move in the direction of arrow 7 while keeping the distance from it approximately constant. In other words, it has a structure in which the offset can be changed. FIG. 3(a) shows the case when the offset is the farthest to the left, and FIG. 3(b) shows the case when the offset is the farthest to the right. Note that during this movement, the presser plate 5 is elastically deformed, and even after the guide shaft 3 has moved, the guide shaft 3 remains in the same position as in the initial position.
It has a structure in which it is fixed by pressure welding.

In the configuration of this embodiment, the variable range of the guide shaft 3 can be adjusted freely depending on the outer diameter of the guide #3, the outer diameter of the columnar projections 3a, 3b, and the eccentricity of the guide shaft 3 and the columnar projections 3a, 3b. Since it can be set to , it is possible to absorb all the component dimensional accuracy and assembly accuracy involved in offset and adjust the offset to the target value.

In the above embodiments, the columnar protrusions are cylindrical, so the offset can be adjusted by continuously changing the columnar protrusions 3a.
, 3b and the receiving parts 4a, 4b, and the shaft parts 3c, 3d and the receiving part 4c.
, 4d are line contacts, and are somewhat vulnerable to external disturbances such as vibrations and shocks. However, if the contact portions are fixed with adhesive assistance in some cases, there will be no problem.

An application example of the present invention is shown in FIG. 4, which is a front view of the main part around the guide shaft. In FIG. 4, the columnar projection 3a'
If it is made into a prismatic column, there will be surface contact with the receiving part 4a, and the above-mentioned drawbacks can be eliminated, but the offset adjustment will be intermittent. In this embodiment, the columnar protrusion 3a' was an octagonal column, but
Offset tolerance, outer diameter of guide shaft 3, columnar protrusion 3a'
The number of angles may be determined in consideration of the outer diameter of the guide shaft 3 and the amount of eccentricity between the guide shaft 3 and the columnar protrusion 3a'.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to adjust the offset while maintaining a simple structure. Therefore, it is possible to create an optimal offset value while greatly permitting dimensional accuracy and assembly accuracy related to the components involved in offset, and mass production. A very inexpensive and highly reliable magnetic recording device can be obtained.

[Brief explanation of the drawing]

Figure 1 is a perspective view of the main part of a carriage showing an embodiment of the magnetic recording device of the present invention, Figure 2 is a side sectional view of the main part of a conventional magnetic recording device, and Figure 3 (a) and Figure 3 (1). )) is a front view of the main part around the guide shaft of an embodiment of the present invention, and FIG. 4 is a front view of the main part around the guide shaft of an applied example of the present invention. 1...Magnetic head 2...Carriage 3...Guide shafts 3a, 3a', 3b...Columnar protrusions 3c, 3d...
...Shaft part 3e...Groove 4...Base 4a, 4b, 4c, 4d-=Receiving part 4e...Bottom surface 5...Press plate 6...Auxiliary guide shaft and beyond Above Figure 2 Figure 3 ((1) Figure 3 (b)

Claims (1)

[Claims] 1) A magnetic recording device having a structure in which a magnetic head is mounted on a carriage, the carriage is slidably held on a guide shaft having a circular cross-sectional shape, and the guide shaft is fixed to a base. , a columnar protrusion whose axis is eccentric from the axis of the guide shaft is integrally disposed at the shaft end of the guide shaft, and the base has a bottom surface that supports the outer peripheral surface of the columnar protrusion. A magnetic recording device comprising: a substantially perpendicular receiving surface; and a receiving surface substantially parallel to the bottom surface of the base that supports the outer circumferential surface of the guide shaft excluding the columnar protrusion. 2) The magnetic recording device according to claim 1, wherein the columnar protrusion is constituted by a cylinder. 3) The magnetic recording device according to claim 1, wherein the columnar protrusion is formed of a polygonal column.