JPH052843A - Mechanism for transferring carriage - Google Patents

Abstract

PURPOSE:To provide a carriage transferring mechanism where a stopper is prevented from being worn, wear of a follower spring is reduced and sure transferring is executed without making a follower pin out of place. CONSTITUTION:The follower spring 14 pressing the follower pin 12 to the side of a lead screw 13 and a carriage shoulder part 17 to be a stopper for preventing transfer deviation together with the lead screw 13 in such a way that the follower spring 14 lies between them are provided. The wear of the follower spring 14 by the lead screw 13 is reduced and the breaking of the carriage shoulder part 17 by the abutting of the lead screw 13 is perfectly avoided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a carriage transfer mechanism for transferring a magnetic head to a predetermined position in the radial direction of a magnetic disk.

[0002]

2. Description of the Related Art With respect to a magnetic disk set at a recording / reproducing position, a carriage having a magnetic head mounted thereon is moved in a radial direction of the magnetic disk to position the magnetic head at a predetermined position. Was supported by a guide shaft, and the follower pin and follower spring were projected from the side surface of the carriage to hold the lead screw. Therefore, for example, even if the carriage rotates about the guide shaft due to external vibration, it is necessary to prevent the follower pin from coming off the lead screw.

This has been studied in the conventional carriage transfer mechanism as well, and the international publication WO90 /
Japanese Patent Laid-Open No. 03031 discloses a recording / reproducing apparatus including a carriage transfer mechanism of this type. 4 to 6 are views for explaining the conventional carriage transfer mechanism, FIG. 4 is an exploded perspective view showing the configuration of the main part of the carriage transfer mechanism, and FIG. 5 is a sectional view showing the arrangement of a step motor.
FIG. 6 is an explanatory diagram showing the overall configuration of a magnetic recording / reproducing apparatus incorporating a carriage transfer mechanism.

In FIG. 6, reference numeral 2 is a frame of the main body of the magnetic recording apparatus 1, and a disk driving motor M1 is arranged through an opening 3 formed in the bottom surface of the frame 2. The magnetic disk sent into the magnetic recording / reproducing apparatus and accommodated in the jacket is mounted on the rotary drive shaft 91 of the disk drive motor M1.

On the other hand, a step motor M2 is fixed to the other end of the frame 2, and a guide shaft 60 is fixed to the frame 2 by a clamp 66 and a screw 67 in parallel with the lead screw 61 of the step motor M2. The upper carriage 41 and the lower carriage 51 are movably guided by the guide shaft 60, and the lead pin 62 is attached to the lower carriage 51.
Is fixed, and this lead pin 62 is attached to the lead screw 6
A preload spring 63 is fixed to the lower carriage 51 so as to be engaged with the groove 1 and press the lead pin 62 against the lead screw 61.

Hereinafter, a conventional carriage transfer mechanism will be described in detail with reference to FIGS. 4 and 5.

Upper carriage 4 for holding the magnetic head 40
As shown in FIG. 6, 1 is arranged on a lower carriage 51 which holds a lower head 50, and the lower carriage 51 is moved along a carriage guide shaft 60 by a step motor M2 as a carriage driving motor. The head 40 and the lower head 50 are moved and positioned in the radial direction with respect to the disk set at the recording / reproducing position.

The recess 5 of the lower carriage 51 shown in FIG.
A lead pin 62 that is engaged with and traces a groove of a lead screw 61 provided in the step motor M2 is adhesively fixed to 1b. A preload is applied to the lead pin 62, and the lead pin preload spring 63 is screwed with the screw 64 so that the lead pin 62 accurately traces the groove of the lead screw 61.
Is attached to the female screw hole 51c of the lower carriage 51. Further, the lower carriage 51 is provided with a stopper portion 51d for preventing the lead pin 62 from coming off the groove of the lead screw 61 when a force such as an impact is applied.

[0009]

With the miniaturization of magnetic recording / reproducing apparatus, miniaturization of the carriage transfer mechanism is also required. The dimension of each part in the axial direction of the lead screw 61 by the conventional mechanism is required. Since a predetermined seek width is required in the radial direction of the magnetic disk in order to shorten the length of the lead screw 61, the lead screw 61 is placed inside the limited width area outside the carriage.
It is necessary to dispose the lead pin 62 that engages with the groove, the preload spring 63 that applies a preload to the lead pin 62, and the stopper 51d that prevents the lead pin 62 from coming out of the groove of the lead screw 61.

However, since the preload spring 63 and the stopper 51d are juxtaposed in the limited width region, the width of the preload spring 63 becomes narrow. Preload spring 63
When the width of the preload spring 63 is narrowed, the contact area with the lead screw 61 is reduced, so that the pressure contact wear of the preload spring 63 is increased and the operating life is shortened.

Further, in the above-described conventional carriage transfer mechanism, when the lead pin 62 disengages from the groove of the lead screw 61 and tries to ride on the mountain portion when the carriage rotates due to external vibration during seek operation, the lead screw 61 stops. This contact is directly contacted with 51d to prevent this riding, but with this contact, the stopper 51d formed integrally with the carriage of synthetic resin material is damaged by the lead screw 62 of metal material, and the stopper function is deteriorated. .

The present invention has been made in view of the above problems of the prior art, and an object thereof is to prevent wear of a stopper,
Another object of the present invention is to provide a carriage transfer mechanism that reduces wear of the follower springs and ensures reliable transfer without the follower pins coming off.

..

According to the above object, a follower pin is fixed to a carriage having a magnetic head attached to its tip, and the follower pin is engaged with a lead screw rotatably driven by a stepping stepping motor. In the carriage transfer mechanism in which the follower pin is moved by being traced by the rotating lead screw and the carriage is transferred by the movement of the follower pin, the follower pin is opposed to the follower pin by sandwiching the lead screw, and the follower pin is connected to the lead screw. A follower spring that is pressed to the side and a carriage shoulder that serves as a stopper for the transfer deviation by interposing the follower spring between the lead screw and the lead screw, and the carriage shoulder includes the carriage shoulder. Is accomplished by taking a transfer mechanism means of a carriage, characterized in that projecting from the formed openings.

[0014]

By such means, the carriage shoulder, which serves as a stopper for the transfer deviation, has the follower spring interposed between the carriage shoulder and the lead screw. Therefore, the width of the carriage shoulder is set in the radial direction of the carriage. No need to add to width. Therefore, the follower spring can have a sufficient width and the contact area with the lead screw can be set to be wide, and wear can be reduced. Also, when the follower pin disengages from the groove of the lead screw and tries to ride on the mountain portion due to external vibration, the rotating lead screw abuts the follower spring, and the follower spring abuts the carriage shoulder that serves as a stopper. The lead screw can prevent the carriage shoulder from being damaged.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. Here, FIG. 1 is a perspective view showing a configuration of a main part of the embodiment, FIG. 2 is a front view of the main part, and FIG. 3 is a plan view of FIG.

In the embodiment, the holding portion 1 of the lower carriage 10
A follower pin (lead pin) 12 is fixed to the end of the lead screw 1 at a right angle to the axis of the lead screw 13.
1. A follower spring 14 whose end is screwed and fixed to the upper surface of 1.
Are arranged. The tip of the follower spring 14 is
It extends from the side surface of the lower carriage 10 and is extended.
The lead screw 13 that is located in engagement with the follower pin 12 is sandwiched between the follower pin 12 and the lead screw 13 is pressed.

An opening 16 is provided on the plate surface of the follower spring 14 as shown in FIG. 3, and a carriage shoulder portion 17 integrally formed on the holding portion 11 is formed through the opening 16. ing. The leading end of the carriage shoulder 17 opposes the follower spring 14 that is disposed by pressing the lead screw 13 while maintaining the interval ΔS. The space ΔS is formed in the lead screw 13 and the follower pin 12 is engaged with the space. The depth is set to be shorter than the depth of the groove, and the follower pin 12 does not come out of the groove of the screw 13 even if the carriage rotates by ΔS.

In the above-described embodiment, during the seek operation, the lower carriage 10 is rotated by, for example, external vibration so that the follower pin 12 is disengaged from the groove of the lead screw 13 and rides on the mountain portion. Then,
As described above, ΔS is shorter than the depth of the groove of the lead screw 13, so the follower spring 14 contacts the carriage shoulder 17 before the follower pin 12 rides on the mountain portion.
The follower pin 12 does not come out of the groove of the lead screw 13. In this case, since the lead screw 13 does not directly abut the carriage shoulder portion 17, the carriage shoulder portion 17 is not damaged by being deformed or chipped, the ΔS is always constant, and stable transfer can be performed. . Further, in the embodiment, since the width of the follower spring 14 can be widened, the contact area with the lead screw 13 can be made large, the state of the contact surface is stable, uneven wear does not occur, and wear does not occur. It can be reduced and the operating life can be greatly extended.

In the embodiment, in the seek operation, the dynamics of the follower spring 14 and the carriage shoulder portion 17 are changed by moving the magnetic head toward the center of the magnetic disk and moving it away from the center. Are performed under exactly the same conditions. That is, in the embodiment, the carriage shoulder portion 17 is arranged at the center of the follower spring 14 regardless of the carriage transfer direction.
4, the lead screw 13, and the follower pin 12 have the same mechanical relationship. Therefore, in the embodiment, highly accurate transfer characteristics of the magnetic head can be realized.

Further, in this type of transfer mechanism, it is better to cope with external vibration by setting the spring constant of the follower spring 14 to be low so that the spring force does not change much even if the follower spring 14 is displaced. Stable and stable transfer operation,
In the above-described embodiment, since the opening 16 is formed in the follower spring 14, the span of the follower spring 14 can be increased. Therefore, the spring constant is reduced, and stable transfer operation can be performed.

[0021]

As described above, according to the present invention,
The contact area of the follower spring with the lead screw is increased, and wear of the follower spring is reduced. Further, when the carriage is rotated by the application of an external force, the follower spring comes into contact with the carriage shoulder to perform the stopper operation.
The lead screw is completely prevented from hitting the carriage shoulder and damaging the carriage.

[Brief description of drawings]

FIG. 1 is a perspective view showing a configuration of a main part of an embodiment of the present invention.

FIG. 2 is a front view of a main part of an embodiment of the present invention.

FIG. 3 is a plan view of FIG.

FIG. 4 is an exploded perspective view of a carriage transfer mechanism portion of a conventional recording / reproducing apparatus.

5 is a vertical cross-sectional view of FIG.

FIG. 6 is an explanatory diagram showing an overall configuration of a conventional recording / reproducing apparatus.

[Explanation of symbols]

 10 Lower Carriage 11 Holding Part 12 Follower Pin 13 Lead Screw 14 Follower Spring 17 Shoulder

Claims (1)

Claim: What is claimed is: 1. A follower pin is fixed to a carriage having a magnetic head attached to the tip thereof, and the follower pin is engaged with a lead screw which is rotationally driven by a stepping stepping motor, and is rotated by the stepping motor. In the carriage transfer mechanism in which the follower pin is moved by being traced by the lead screw and the carriage is transferred by the movement of the follower pin, the lead screw is sandwiched between the follower pin and the follower pin, and the follower pin is placed on the lead screw side. The follower spring that presses and the lead screw are provided between the lead screw and the carriage shoulder that serves as a stopper for transfer deviation. The carriage shoulder is formed in the follower spring. A carriage transport mechanism, characterized in that projecting from the openings.