JPH0237181Y2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field The present invention relates to a magnetic disk device such as a floppy disk drive device, and particularly relates to a technique that is effective when applied to a home sensor mounting mechanism of a floppy disk drive device.

BACKGROUND ART In magnetic disk devices such as floppy disk drives, the home sensor position adjustment for setting the magnetic head on the zero track of the disk has been improved to 100TPi (1
In the case of 200TPi (number of tracks per inch), the track pitch has become smaller to 0.254mm and 0.127mm, and the adjustment range has also become smaller to ±0.2mm and ±0.1mm. In addition, due to the high packaging density, a printed board (hereinafter referred to as PCB) is installed on the top of the home sensor.
More and more things are covered. Adjustment of the home sensor position is done while observing the output of the home sensor with an oscilloscope after all the assemblies are completed.
The conventional home sensor position adjustment mechanism, as shown in FIG.
After finely adjusting the bracket 2 by hand or using a jig, the adjustment screw 4 is tightened and fixed.

Further, as shown in FIG. 2, a home sensor 3 is attached to a bracket 2 having an elongated hole 1, and after fine adjustment is made by rotating the bracket 2 around the support pin 5, the adjustment screw 4 is tightened. Fixed.

However, such a conventional home sensor position adjustment mechanism has the following drawbacks.

(1) Adjustments take time because they are all adjusted by hand or with a jig, etc., by feeling while looking at an oscilloscope.

(2) As mentioned above, if a PCB is attached to the top of the home sensor due to the increase in packaging density, it will be difficult to adjust it as it is, so instead of attaching the PCB, prepare a separate PCB for the checker and attach it to the top of the home sensor. You will have to make adjustments while testing.

(3) If you wish to make adjustments after installing the PCB, you will need to flip the main unit over to make adjustments from the back of the main unit. This causes inconveniences especially in automation of production.

Purpose The purpose of the present invention is to provide a technical means that allows the home sensor position to be adjusted simply and in a short time without having to turn over the device body after all the assemblies are completed.

Configuration The configuration of the present invention will be explained together with examples.

3 and 4 are diagrams showing the configuration of an embodiment of the present invention, and FIG. 3 is a partially cutaway front view,
FIG. 4 is a partially cutaway plan view.

In FIGS. 3 and 4, 10 is a magnetic head carriage, and 11 is a home sensor shutter provided in the magnetic head carriage 10. In FIG. 12 is a home sensor, and a magnetic head carriage 10
The home sensor shutter 11 and the home sensor 12 fixed to the elastic member 16 engage with each other at the position where the home sensor shutter 11 moves to the vicinity of the zero track.
One end of the elastic member 16 is fixed to the L-shaped steel body 14 with a fixing screw 15, and the L-shaped steel body 14 is fixed to the housing 13. Reference numeral 17 denotes a home sensor position adjustment screw (hereinafter referred to as adjustment screw) that is engaged with the L-shaped steel body 14. By screwing in this adjustment screw 17, a part of the elastic member 16 is made elastic at its tip. It's starting to push against me. 18 is
PCB 19 is a jig such as a driver.

Next, the operation of this embodiment will be explained.

When all the parts have been assembled, the magnetic head carriage 10 is moved between the home sensor switching tracks.
For example, the adjustment screw 17 is set so that the output of the home sensor 12 is turned ON and OFF by continuously reciprocating between Truck 1 and Truck 2.
As shown in Fig. 5, the housing 13 and the PCB 18
Adjustment is made by rotating the jig 19 through the gap between the two. Here, a pressing load is applied to the adjusting screw 17 due to the bending load of the elastic member 16, and the elastic member 1
By appropriately selecting the bending load 6, the adjustment screw 17 will not loosen and the adjustment value will not change.

In addition, adhesive may be applied to the adjustment screw 17,
If you use a locking nut on the female thread,
There is no need to be particular about the bending load of the elastic member 16.

In addition, with the increase in packaging density and miniaturization, the home sensor 12 is attached to the housing 13, and the PCB 1 is mounted on it.
8 has become indispensable, but as mentioned above, this can be easily adjusted by inserting a jig such as a screwdriver through the gap between the housing 13 and the PCB 18.

The adjustment screw 17, as shown in FIG.
It may be attached to the elastic member 16 side.

Further, the L-shaped rigid body 14 may be a housing as shown in FIG.

Further, as shown in FIG. 8, the rigid body 14 and the elastic member 16 are integrally formed, and a U-shaped elastic member 20
It can also be attached directly to the housing.

Effects As explained above, the novel technical means disclosed in the present application provides the following effects.

(1) Since the home sensor is supported by an elastic member and can be easily adjusted using an adjustment screw, the adjustment time can be significantly reduced.

(2) According to (1) above, adjustments can be made from the gap between the casing and the PCB even after all parts have been assembled, and adjustments can be made without moving the main body of the device.

It goes without saying that the present invention is not limited to the embodiments described above, and can be modified in various ways without departing from the gist thereof. For example, it goes without saying that spot welding may be used instead of fixing with the fixing screws.

[Brief explanation of the drawing]

1 and 2 are diagrams for explaining the problems of the conventional home sensor position adjustment mechanism, and FIGS. 3 and 4 are diagrams showing the configuration of an embodiment of the present invention. 3 is a partially cutaway front view thereof, FIG. 4 is a partially cutaway plan view thereof, and FIG. 5 is a diagram for explaining the operation of the embodiment shown in FIGS. 3 and 4.
6 to 8 are diagrams showing an embodiment of the home sensor position adjustment mechanism of the present invention. 10... Magnetic head carriage, 11... Home sensor shutter, 12... Home sensor, 13
... Housing, 14 ... L-shaped rigid body, 15 ... Fixing screw, 16, 20 ... Elastic member, 17 ... Adjustment screw, 18 ... PCB, 19 ... Jig.

Claims (1)

[Scope of utility model registration request] In a home sensor attachment mechanism for a magnetic disk drive device, the home sensor is attached to an elastic member, one end of the elastic member is fixed to a rigid body such as a housing, and the home sensor is mounted at a position away from the fixed part of the elastic member or the rigid body. A magnetic disk drive device characterized by engaging a position adjustment screw.