JPS6083266A - Carriage driving mechanism of disk type storage device - Google Patents

Abstract

PURPOSE:To remove almost completely and semipermanently the play of a ball bearing by fitting obliquely some of plural ball bearings guided by a couple of guide shafts and the remainders, to the perpendicular line of a plane containing the axial centers of both guide shafts in the opposite direction. CONSTITUTION:The support shaft 5a of a left-side ball bearing 5 is fitted in slanting right to the perpendicular line of the plane containing the axial centers of the left and right guide shafts 2 and 2, and the support shaft 5a of a right ball bearing 5 is fitted in slanting left to the plane containing the axial centers of the left and right guide shafts 2 and 2. The elastic force of a spring 9 operates through the path extending in the order of the left guide shaft 2, left ball bearing 5, support shaft 5a, carriage body 4, support shaft 5a, right ball bearing 5, right guide shaft 2, and the internal surface of a base housing 1. Therefore, the ball bearings 5, 5, and 5 are pressurized radially and axially by the elastic force of the spring 9 at the same time, so the value of this elastic force is selected properly to remove a radial and an axial play almost completely and semipermanently.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a linear access type carriage of a disk type storage device used as an external storage device of an electronic computer.
',g IA to 4j Kaiso 1jtJ.

This god conventional Karitsuka I: (i motion (shibu 1 + 'i is 't
't'le is as shown in 1st i'A and Fig. 2,
The base of the 114-ki disk record 1 notification device consists of a body 1 and a pair of guides (not shown) arranged in parallel along the radial direction of the magnetic disk within the four parts 1a of the base housing f'k1.
ll+ 2, 2, the carriage body 4 on which the tip (11 air heads 3) are attached, and the left-right system '1q11 2 fixed to the lower 1JIi of the carriage body 4 in alternating positions on the left and right. 20, and between the left and right systems internal information 2.2, a U-shaped peripheral surface is provided on either one of the internal systems 2, 2. (Three ball bearings that were made into mistresses 5, 5.

5, a stepping motor 6 fixed to the upright portion 1b of the base 11 and the body 1, a capstan 7 attached to the rotating shaft Ga1C7 of the stepping motor 6, and a capstan 7 wound around the capstan 7, Basically, the part is fixed to the capstan 7 (X is fixed to the gear ridge main body 4 and is made from a steel band 8 etc. which is tensioned by a spring (not shown). The carriage main body 4 is moved along the guide shaft 2°2 by causing the stepping motor 6 to apply the carburetor's tamp once and changing the positions of both ends of the steel band 8 by equal distances in the same direction. i) Even if the ball bearing 5 was made with a 11mm diameter, there was a slight radial gap between the inner ring and the ball and between the outer ring and the ball. Because of this, in the case of a magnetic disk storage device that requires precision, this slight 14-distance appears as a misalignment of the magnetic head 3 with respect to the storage track of one drowsy disk, and the magnetic disk storage device is unable to record data. There was a problem that the device could not withstand the intended use, but this problem was solved by the spring 9 interposed between the inner surface of the base casing l and one of the guide shafts 2. Guidance+
1Ill+ 2, direction in which the distance between 2 is narrow (both guide shafts 2
, 2 (in a direction perpendicular to the axis) and applying pressurization to each ball bearing 5, 5.5, the problem could be completely solved. In addition, play in the axial direction of the ball bearing 5 appears as a change in the gap between the magnetic disk surface and the (-pressure bottom 3), causing output fluctuations. A sponge plate 10 is placed between the top surface and the carriage body 4 is pressurized downward by the external force of the sponge 11. However, when the sliding plate 10 and sponge + tl are used to remove the play in the axial direction of the ball bearing 5, the preload force in the 7-way range is difficult to be constant and changes over time are also large. Output change!1iI
I couldn't keep l to the principal. Moreover, since special component sounds are used, there is also the problem that the entire bale 14 becomes expensive and expensive.

The object of the present invention is to solve the above-mentioned problems, to completely and semi-permanently remove both the radial and axial play of ball bearings, and to provide a carriage that allows the entire mechanism to be constructed as a sketch. The purpose is to provide a drive mechanism.

The carriage and drive mechanism according to the present invention has a plurality of ball bearings guided by a pair of guide shafts, one part of which is guided by a pair of guide shafts, and the other part of each of the two guide shafts II.・-II They are characterized in that they are mounted so as to be inclined in opposite directions with respect to the perpendicular to the plane containing the core.

Hereinafter, the present invention will be described in detail based on the embodiment shown in FIG. 3 and WJ4, with the same members as those in the conventional example described above being designated by the same reference numerals.
is inclined several times to the right with respect to the perpendicular to the plane including the axis of the left and right guide shafts 12, 2, and the support shaft 5a of the right ball bearing 5 is aligned with the axis of the left and right guide shafts 2, 2. It is tilted to the left with respect to the plane that contains it.

Since the carriage and drive unit (1η) according to the present invention are constructed as described above, the elasticity of the spring 9 is the following: the left guide shaft 2 - the left ball bearing 5 - the support shaft 5a - the carriage body 4 - the support shaft 5a - the right Ball bearing 5-right jt
! 11 guide j1ζ 112 - 3 acting on the path leading to the inner surface of the base topo body 1, therefore, the elasticity of the spring 9 is F
Then, this elasticity F is a radial component force Fr in the left ball bearing 5 (as shown in FIG. 4).
(= F cos θ) and axial component force Fa (, = Fsi
nθ) and act as exclusive use for the ball bearing 5. However, θ+d is the inclination angle of the support shaft 5 including the axis of both guide shafts 2, 2. In addition, stress due to the elasticity F is applied to the ball bearings 1 and 5 on the right side A, and the force is similarly divided into the radial component force and 1.
The ball bearing 5 is divided into component forces in the + direction.
．． It acts as a pressurization against 5pC, and is half of the value of the ball bearing 5 of 1 left (1j).Thus, according to the carriage 1 small movement mechanism according to the present invention, the elasticity of the spring 9 causes the ball bearing 5
, 5, 5 can be occupied simultaneously in the radial direction and axial direction, so by appropriately selecting the value of this elasticity, the backlash of the ball bearings 5, 5.5 in the radial direction and in the 11i111 direction can be completely eliminated. It can be removed semi-permanently. Therefore, the displacement of the magnetic head from the trunk and the occurrence of output fluctuation are prevented, so that a highly reliable magnetic disk storage device can be obtained.

In addition, the necessary configuration for this purpose is a ball bearing 5.
Since there is no need to use separate parts for the r-surface by simply tilting the support 15a, the entire mechanism becomes cheaper.

Note that the carriage drive mechanism according to the present invention differs from the above embodiment in that a pair of guide shafts are arranged between the left and right ball bearings, and a spring that acts in the direction of increasing the distance between the guide shafts is placed between the guide shafts. It is also possible to configure by intervening.

Further, the spindle of the ball bearing (may be made to have its head in the opposite direction to that in the above embodiment. Also, this carriage and drive mechanism can be sufficiently applied to an optical disk type storage device with a high recording rate of 4 degrees. It is possible.

As mentioned above, the carriage and drive mechanism according to the present invention can almost completely and semi-permanently eliminate both the radial and axial backlash of the ball bearings, and is practical in that the entire mechanism can be constructed easily. It has very important advantages.

[Brief explanation of drawings]

FIG. 1 is a plan view of a magnetic disk storage device including a conventional carriage drive mechanism, FIG. 2 is a sectional view taken along line I+-■ in FIG. 1, and FIG. 3 is an embodiment of the carriage and drive mechanism according to the present invention. FIG. 4 is a longitudinal cross-sectional view of the ball bearing of the above-mentioned actual hm example. ■・・・Base 11□) Body, 2・・・・1 iql in system
,; U... Magnetic head, 4... Carriage body, 5... Ball bearing, 5a... Support shaft, 6
Middle/Stepping motor, 7...Capstan, 8
...Steel band, 9...Spring. 1-1 Figure 2 Off Figure 1

Claims (1)

[Claims] A pair of guide shafts are arranged in parallel in the radial direction of the disk (10), and each is fitted into a number of support shafts that are pivotally connected to the carriage body at different positions alternately on the left and right. a plurality of ball bearings each having a U-shaped grooved peripheral surface in contact with either one of the guide shafts; In a carriage 1 drive mechanism of a disk storage device, which is equipped with a spring that presses in a direction that presses against a surface, a part of the plurality of support shafts and the other part are guided by the guide +1.
Ill+'s 1lIII+ is mounted obliquely in the opposite direction to the perpendicular to the plane containing the core f: Characteristic gear 9f 9f single movement mechanism.