JPS61196477A - Magnetic disk driving device - Google Patents

Abstract

PURPOSE:To make an assembling operation easy by supporting with a stopper capable of easily being fixed to a shaft an end of a spring provided in the shaft for slidably guiding a carriage of an FDD. CONSTITUTION:Initially, an inner diameter of a stopper 30 is fitted into a shaft 8 and directly pressed into to engage a protrusion 30a of the inner diameter section of the stopper 30 with a groove 8a of a shaft 8 and fix the shaft 8 ad the stopper 30. Under this condition, when a pressing spring 29, a collar 31 and a protruding section 9 of a carriage 3 are successively inserted into the shaft 8, on mounting the carriage 3 to a chassis, it is not required that the pressing spring 29 is pressed by hand. When fastening screws 24, 25, only three parts of the carriage 3, shafts 6 and 8 are pressed by one hand. Thereby, it is not necessary to support an end section of the pressing spring 29 directly by fingers and an installation and an assembling are extremely easy.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Application of the Invention) The present invention relates to a magnetic disk drive device (hereinafter referred to as FDD) provided in a magnetic recording/reproducing device or the like, and particularly to an FDD that can improve assembly workability.

[Background of the invention]

An FDD has a structure in which a spring that biases the magnetic disk toward the center of rotation is attached to a shaft that slides and guides a carriage equipped with a magnetic head that records and reproduces information on the magnetic disk in the radial direction of the magnetic disk. Kaisho 59-9
It is publicly known from No. 2463 and the like. However, in these conventional techniques, when installing the spring on the shaft and inserting it into the carriage, the carriage, shaft, and spring are simultaneously held and held at a predetermined position on the chassis. It was necessary to secure it to the chassis with screws. Therefore, when tightening screws, etc., many of the parts must be held at the same time with one hand, resulting in extremely poor assembly work efficiency.

[Purpose of the invention]

The present invention has been made in view of the above-mentioned points, and its object is to provide an FDD with good assembly workability that can be assembled with simple operations.

C. Summary of the Invention The present invention relates to a shaft that slides and guides a carriage on which a magnetic head is mounted in the radial direction of a magnetic disk.

A stopper is provided near one end of the shaft to lock one end of a spring that biases the carriage toward the rotation center of the magnetic disk or in the opposite direction, and a projection is provided on the inner diameter of the stopper, and a projection is provided on the inner diameter of the stopper. Nine grooves are formed near one end, and the stopper is fixed to the shaft by fitting these protrusions and grooves to achieve the intended purpose. It is something.

[Embodiments of the invention]

An embodiment of the PDD according to the present invention will be described below with reference to the drawings.

An embodiment of the present invention is shown in FIGS. 1 to 5. As shown in FIG. 1, a spindle 1 is the central axis of a spindle motor (not shown) that rotationally drives a magnetic disk 2. F of stepping motor 4 etc.
It is fixed to a chassis (not shown) that houses all the main parts that make up the DD. As shown in FIG. 2, this carriage 3 is equipped with a lower head 5 for recording and reproducing information on the magnetic disk 2 at its tip end on the spindle 1 side, and on both sides of the carriage 3. A hole 7 for passing the shaft 6 which slidably supports the shaft 6, and a protrusion 9 having a U-shaped cross section for slidably holding the shaft 8.
are formed respectively. On the other hand, the head arm 11 on which the upper head 10 is mounted has a head arm spring 12 integrated by insert molding or the like, and is mounted on a rising portion 13 formed at the tip of the carriage 3 on the opposite side from the lower head 5. This head arm spring 12 is mounted. Further, a spring holding plate 14 is placed on the head arm spring 12, and is screwed together with the head arm spring 12 onto the upper surface of the rising portion 13 of the carriage 3 by screws 15. A sensor screw 16 for detecting the track position is screwed onto the tip of the sensor screw 16 for detecting the track position.

The magnetic disk 2 is held between the lower head 5 and the upper head 10, and in order to apply appropriate contact pressure between the lower head 5 and the upper head 10 and the magnetic disk 2, the springs are applied. Pressing springs 17 are attached to protrusions 14a formed on both sides of the rising portion of the presser plate 14, and press springs 17 are attached to the upper surface of the head arm 11 so that the head arm 11
'& is biased downward. the hole 7 of the carriage 3
A mounting portion 19 for the connecting plate 18 is formed on one side of the joint, and the connecting plate 18 is fixed to this mounting portion 19 with screws 20. A joint metal 21 is attached to the L-shaped rising portion of the connecting plate 1B.

Both ends of the shafts 6 and 8 are fixed to the chassis with screws 24 and 25, respectively, via a press plate 22 and a pair of press plates 23, and the carriage 3 slides on these shafts 6 and 8. However, this carriage 8 is driven by a stepping motor 4 fixed to the chassis.

A screw 26 that meshes with the shaft is attached to the shaft of the stepping motor 4, and a stopper 27 is fixed to the tip of the screw 26 via the joint metal 21. One end engages with a bolt 28 formed on a rising portion of the connecting plate 18 to prevent the screw 26 from rotating, so that the screw 26 is driven in a straight line by the rotation of the stepping motor 4. . The joint between the rotation stopper 27 and the joint metal 21 is a universal joint so that the center of the screw 26 can be freely aligned. 3 is always biased in the direction of the spindle 1. This push spring 29 is attached so as to surround the sliding surface of the carriage 3 of the shaft 8, and stoppers 3 are attached to both ends of this push spring 29.
0 and a collar 31 are each attached to the shaft 8. This stopper 30 has a ring shape as shown in FIG. 2, and has a protrusion 30a formed on its inner diameter, and a groove 8a near one end of the shaft 8 on the holding plate 22 side as shown in FIG. As shown in FIG. 3, the protrusion 30a of the stopper 30 fits into this groove 8a, and the stopper 30 is fixed to the shaft 8, supporting one end of the push spring 29. It has become. Also, the color 3
1 is attached to the shaft 8 with a loose fit as shown in FIG. Therefore, since this collar 31 is always pressed against the protrusion 9 by the biasing force of the push spring 29, it slides together with the protrusion 9 when the carriage 3 slides.

Regarding this embodiment configured as described above, the assembly procedure will be explained below with reference to FIGS. 4 and 5.

First, fit the inner diameter of the stopper 80 into the shaft 8, push it in as it is, and engage the protrusion 30a on the inner diameter part of the stopper 30 with the groove 8a of the shaft 8, so that the shaft 8 and the stopper 3
0 and fixed. In this state, as shown in FIG. 4, the spring 29 is pressed against the shaft 8. By sequentially inserting the collar 31 and the projection 9 of the carriage 3, the carriage 3 will be inserted into the chassis.
There is no need to press the push spring 29 by hand when installing the.

When tightening the screws 24 and 25, only three parts, the carriage 3 and the shafts 6 and 8, need to be held down with one hand.

As described above, according to this embodiment, by fixing the stopper 30 to the shaft 8 with a simple assembly operation, one end of the push spring 29 can be easily fixed to the shaft 8, and the end of the push spring 29 can be easily fixed to the shaft 8. It is no longer necessary to support the carriage 3 directly with the fingertips, making it extremely easy to attach and assemble the carriage 3 to the chassis.

〔Effect of the invention〕

As described above, according to the present invention, one end of the spring provided on the shaft that slides and guides the carriage of the FDD is supported by a stopper that can be easily fixed to the shaft, making assembly work easier. Productivity is improved and inexpensive FDDs can be provided.

[Brief explanation of drawings]

FIG. 1 is a front view showing the shaft of an embodiment of the FDD according to the present invention, FIG. 2 is a sectional view similarly showing the stopper, and FIG.
FIG. 4 is a partially sectional front view showing a state in which a stopper is fixed to a shaft, and FIG. 4 is an exploded sectional view showing an assembly sequence of main parts according to an embodiment of the present invention. FIG. 5 is a sectional view of the assembled product, FIG. 6 is a structural diagram showing the entire FDD, and FIG. 7 is a perspective view of the carriage. 2...Magnetic disk, 3...Carriage, 5...
Lower head, 6.8...Shaft, 8a...Groove, 10
...Upper head, 29...Spring, 30...Stopper, Boa...Protrusion.

Claims (1)

[Claims] 1. A carriage carrying a magnetic head for recording and reproducing information on a magnetic disk, a shaft that slides and guides this carriage in the radial direction of the magnetic disk, and a shaft that is installed on this shaft to move the carriage to the center of rotation of the magnetic disk. In a magnetic disk drive device, a stopper for locking one end of the spring provided on the shaft is provided near one end of the shaft, and an inner diameter of the stopper is provided near one end of the shaft. A magnetic disk drive device characterized in that a protrusion is formed at a portion of the stopper, and a groove is formed near one end of the shaft, and the stopper is fixed to the shaft by fitting the protrusion and the groove.