JPS6080158A - Floppy disk driver - Google Patents

Abstract

PURPOSE:To prevent a co-revolution phenomenon of a hub and to secure stable revolutions of a disk by setting a larger frictional torque between a collet and a collet lever than that between a hub and a hub holder. CONSTITUTION:When a floppy disk 16 is stored, a hub 14 is pressed by a collet 17 pressed by a collet lever 18. Then a projection 17a and a drive shaft 15 are fitted to the guide grooves 14c formed on both sides of the hub 14 respectively. Therefore the disk 16 is chucked, and both the hub 14 and a hub holder 13 are revolved in a body by the shaft 15 when a main shaft 11 is revolved. The frictional torque between the collet 17 and the lever 18 is set larger than that between the hub 14 and the holder 13. This prevents a co-revolution phenomenon of the hub 14 and secures the stable revolutions of the disk 16. Then the synchronous revoltuions are obtained between the collet 17 and the hub 14 with reduction of a disk loading position shift. Thus the chucking accuracy is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a floppy disk drive having a central hub.

[Background of the invention]

Generally, in a floppy disk drive, the hub of the floppy disk is pressed by a collet against a knob holder rotated by a motor, and the hub of the floppy disk is pressed against a knob holder rotated by a motor.
A floppy disk is mounted on the hub holder by locking a drive shaft provided on the hub holder with a locking wall provided on the hub of the 70-tube disk.

However, with the above configuration, the floppy disk rotates in a state where the drive bolt of the /1 block does not engage with the locking wall of the hub due to M friction between the no-fu receiver and the floppy disk. (hereinafter referred to as the drawing phenomenon) may occur. For this reason, after starting to read and write data without knowing that the drawing phenomenon is occurring, the no-pu-receiver may not be able to drive the hub-receiver if a disturbance such as #MA force is applied to the hub. Since the hub rotates above the hub holder until the shaft collides with the locking wall of the hub, data cannot be read or written accurately.

[Purpose of the invention]

An object of the present invention is to provide a floppy disk drive device that can prevent the grain phenomenon.

[Summary of the invention]

The gist of the present invention is to provide a huff receiver having a main shaft and a drive shaft located outside the main shaft, an opening into which the main shaft fits, and a guide groove into which the drive shaft engages on the upper and lower surfaces, and a floppy disk. A locking mechanism for locking the drive shaft in the guide groove, comprising a hub provided at the center of the disk, a collet for pressing the hub against the hub receiver, and a collet lever for rotatably supporting the collet. In a floppy disk drive device provided with a wall, the collet is provided with a protrusion that locks on the locking wall, and a load torque T2 due to friction between the collet and the collet lever and a load torque T2 between the hub and the hub receiver are provided. The point is that the relationship with the rotational torque 1it1 due to the friction between the two is set to %T2>Tt. This ensures that the drive shaft of the hub holder is always locked on the locking wall of the hub, eliminating the graining phenomenon.

[Embodiments of the invention]

An embodiment of the present invention will be described based on the drawings.

In the drawings, a chassis 1 is equipped with various parts constituting a floppy disk device. The magnetic head 2 for reading and writing data consists of an upper head 2a and a lower head 2b. The upper head 2a.

It is attached to the head arm 4 via the gimbal 3.

The lower head 2b is attached to the carriage 5 via a gimbal 3a. A pulley 7 is attached to the tip of the shaft of the step motor 6. A steel belt 8 is wound around the pulley 7. Sterbel l-
Both ends of 8 are screwed to the carriage 5.

The motor 9 serves as a drive source for rotating the floppy disk 10. A rotor yoke 12 is screwed to the lower end of the shaft 11 of the motor 9, and a hub receiver 13 is integrated into the upper end of the shaft 11 by press-fitting or gluing. The shaft 11 of the motor 9 has its upper end protruding from the upper surface of the hub receiver 13 to serve as a main shaft.

The hub receiver 13 is provided with a drive shaft 15 for driving a hub 14 made of synthetic resin such as borearylate resin.

The hub 14 includes a flexible disk 1 having a thickness of approximately 80 μm.
6 is provided. An opening 14a is provided in the center of the hub 14, into which the shaft 11 serving as the main axis is inserted. Circular guide grooves 14c are provided on both upper and lower surfaces of the hub 14. A stop wall 14b is formed in a portion of the guide groove 14C.

A collet 17 made of oil-impregnated Duracon or the like is attached to the hub 14.
is pressed against the hub receiver 13.

The collet 17 is rotatably attached to the tip of a collet lever 18 made of an elastic member such as stainless steel.

The collet 17 is provided with a protrusion 17a that engages with the guide groove 14C of the hub 14. The force that tries to warp the hub 14, that is, the opening 14a and the shaft 11
Rotating torque T1 due to friction between the hub 14 and the hub receiver 13 causes the collet 17 to move between the collet lever 18 and the hub 14.
This is smaller than the load torque T2 due to friction between the two. The relationship between the rotational torque TI and the load torque T2, that is, T is also maintained.

In order to make the load torque T2 larger than the rotational torque T+, (1) the frictional force between the huff receiver 13 and the huff 14 is reduced by coating the upper surface of the huff receiver 13 with fluororesin;

(2) The contact area between the collet 17 and the collet lever 18 is increased to increase the h friction load.

(3) Cholera) 17. ! :1 with collet lever 18
A separate member is provided to increase the frictional load.

There are other means such as

In the above configuration, when the floppy disk 10 is stored in the chassis 1, the hub 14 is pushed by the collet 17 pressed by the collet lever 18, and the shaft 11 is inserted into the opening 14a of the hub 14 and the guide on the lower surface of the hub 14. The drive shafts 15 are engaged with the grooves 14C, and the protrusions 17a of the collet 17 are engaged with the guide grooves 14C on the upper surface of the hub 14.
- The floppy disk 10 is in a chucked state. In this state, when the motor 9 is rotated, the drive shaft 15 of the hub receiver 13 is moved to the locking wall 14 of the knob 14.
The knob 1 knob receiver 13 rotates until it touches the hub 1.
4 rotates integrally with the knob receiver 13 by a drive shaft 15. At this time, in this embodiment, the locking pin 17a of the collet 17 is locked to the locking wall 14b provided in the guide groove 14C on the upper surface side of the hub 14, and the collet 17 and the hub 14 are integrated. As a result, a load torque T due to friction between the collet 17 and the collet lever 18 is applied to the hub 14.

However, since this load torque T2 is set to be much higher than the rotational torque Tl which causes the knob 14 to rotate, the Ic,/% knob 14 does not rotate.
Stable rotation of the disk 16 can be obtained. Moreover, in this embodiment, since the collet 17 and the hub 14 rotate synchronously, no abnormal noise is generated between the collet 17 and the hub 14, and the mounting positions of the collet 17 and the hub can be misaligned. It is possible to improve the chucking accuracy without any problems.

In this embodiment, the shaft 11 is made to protrude from the upper surface of the hub receiver 13 to serve as the main shaft.However, the shaft 11 is not made to protrude from the upper surface of the hub receiver 13, and the protrusion that becomes the main shaft is provided on the upper surface of the five-knob receiver 13. may be formed integrally.

Further, in this embodiment, the opening 14a is a through hole, but the opening 14a is not limited to the through hole, and the same effect can be achieved if the opening 14a is a through hole, but is not limited to the opening 14a. .

〔Effect of the invention〕

According to the present invention, a floppy disk drive device can be replaced that can prevent the phenomenon of printing failure.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and FIG. 1 is a plan view of the main part, and FIG.
3 is a vertical cross-sectional view of the main part before the floppy disk is mounted, FIG. 4 is an enlarged plan view of the main part, and FIG. 5 is a longitudinal cross-sectional view of the main part.

Claims (1)

[Scope of Claims] 1. A hub receiver having a main shaft and a drive shaft positioned outside the main shaft, and an opening into which the main shaft fits and a guide groove into which the drive shaft engages, respectively, on the upper and lower surfaces. The hub is provided in the center of the floppy disk, a collet that presses the hub against the hub holder, and a collet lever that rotatably supports the collet, and the drive shaft is engaged with the guide groove. In a floppy disk 1 drive device that is provided with a locking wall that locks the collet, the collet is provided with a protrusion that locks the locking wall, and a load torque T2 due to friction between the collet and the collet lever;
A floppy disk drive device characterized in that a relationship between rotational torque TI caused by friction between the hub and the hub receiver is set such that TI>TI. 2. The floppy disk drive device according to claim 1, wherein the guide groove is circular.