JPH02146144A - Clamping mechanism for floppy disk device - Google Patents

Abstract

PURPOSE:To reduce the manufacturing cost of a whole system by forming a clamping mechanism of a sliding bearing member to freely rotate a collet member and a thrust washer member to convey the operation of an opener mechanism to the collet member. CONSTITUTION:When a recording medium 12 is inserted to a device, and a lever is operated, an opener mechanism 17 pushes a thrust washer 24 through a clamper spring 19, and a sliding bearing member 15 is pushed. Consequently, the member 15 compresses a bearing spring 16, and presses a collet member 13 to a spindle mechanism 11 side. Further, the member 13 is fitted with the center hole of the medium 12, it is clamped by the mechanical 11, and the medium 12 is rotated. In addition, the member 13 rotates through the member 15 together with the medium 12 for free rotation using a clamper shaft 10 as the shaft. Thus, by stably rotating the medium with the use of the sliding bearing member at the low cost, the clamping mechanism can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a clamping mechanism for a 5.25-inch or 8-inch floppy disk device, for example.

(Prior Art) Conventionally, for example, in a 5.25-inch or 8-inch floppy disk device, when a magnetic recording medium is inserted from the insertion slot on the front panel of the device, a re-ramp mechanism causes the magnetic recording medium to move onto the spindle. Clamped into the mechanism. The spindle mechanism is a disk rotation mechanism that rotates a clamped magnetic recording medium.

The clamp mechanism includes an opener mechanism (consisting of a clamper hanger, etc.) that operates in conjunction with a lever attached to the front panel, and the collet member fits into the center hole of the magnetic recording medium in response to the operation of the opener mechanism. It is configured to be clamped together with the spindle mechanism. The collet member is made of plastic, and is configured so that when the spindle mechanism is placed on the lower side, the collet member falls when clamped using the clamp shaft as a guide, and rises when the clamp is released. With the magnetic recording medium chucked by the spindle mechanism, the magnetic recording medium and the collet member are rotationally driven by the spindle mechanism. in this case,
A rolling bearing using a ball bearing is provided at the center of the collet member so that the collet member can freely rotate around the clamp shaft.

(Problems to be Solved by the Invention) In the clamp mechanism of a conventional floppy disk device, a rolling bearing using a ball bearing is used as a bearing for freely rotating a collet member. However, since rolling bearings using ball bearings are relatively expensive, this is a factor that increases the manufacturing cost of the clamp mechanism.

An object of the present invention is to provide a clamping mechanism for a floppy disk device that can reduce the overall manufacturing cost by realizing a mechanism for freely rotating a collet member at a relatively low cost. be.

[Structure of the Invention] (Means and Effects for Solving the Problems) The present invention provides a clamp equipped with a collet member that fits into a central hole of a magnetic recording medium and clamps the central portion of the magnetic recording medium to a spindle mechanism. The mechanism includes a sliding bearing member for freely rotating the collet member around the clamp shaft, and a thrust washer member for transmitting the clamping or unclamping operation in the opener mechanism to the collet member via the sliding bearing member. It is a mechanism.

With this configuration, it is possible to construct a mechanism that actually rotates the collet member using a relatively low-cost sliding bearing member.

(Example) The present invention will be described in detail below with reference to the drawings. FIG. 1 is a side cross-sectional view showing the structure of a clamp mechanism used in, for example, a 5.25 inch floppy disk drive according to a first embodiment of the present invention. As shown in FIG. 1, the clamping mechanism of the same embodiment includes a collet member 13 that moves up and down with respect to the spindle mechanism 11 using the clamper shaft IO as a guide and clamps the magnetic recording medium 12 to the spindle mechanism 11. There is. The collet member 13 is made of plastic, and when clamped, it fits into the center hole of the magnetic recording medium 12 and is clamped in such a manner as to press it against the spindle mechanism 11 side. Here, the magnetic recording medium 12 is normally housed in a jacket 14 made of paper, and rotates within this jacket 14.

A sliding bearing member 15 is provided at the center of the collet member 13. The sliding bearing member 15 constitutes a mechanism for freely rotating the collet member 13 around the clamper shaft 10, and is a member that acts to push the collet member 13 outward during clamping. Further, the sliding bearing member 15 is separated from the collet member 13 by the bearing spring 16 when the clamp is released, and the action of pushing the collet member 13 outward is released.

An opener mechanism 17 for transmitting a clamping action to the collet member 13 is engaged with the clamper shaft 10 . The opener mechanism 17 is connected to the clamper shaft 10 by an E-shaped retaining ring member 18.

Here, as shown in FIG. 3 (plan view), the opener mechanism 17 is a clamper hanger (a suppressing plate of the collet member 13).
20, which operates in conjunction with the operation of a lever 22 via a connecting plate 21. The lever 22 is provided on a front panel 23 having an insertion slot for the magnetic recording medium 12.
The operation of clamping and unclamping the magnetic recording medium 12 is executed.

The opener mechanism 17 is interlocked with the lever 22 and applies a thrust load to the thrust washer 24 via the clamper spring 19. The thrust washer 24 transmits a thrust load in the direction of the spindle mechanism 11 to the sliding bearing member 15.

Next, the effects of the first embodiment will be explained. First, when the lever 22 is operated after the magnetic recording medium 12 is inserted into the apparatus main body through the insertion opening of the front panel 23, the opener mechanism 17 compresses the clamper spring 19 in conjunction with the lever 22. Operate. Through this clamper spring 19, a thrust load is applied to the thrust washer 24 in the direction of the spindle mechanism 11. Thrust washer 24 transmits thrust load to sliding bearing member 15 .

As a result, the sliding bearing member 15 compresses the bearing spring 16 while moving the collet member 13 to the spindle mechanism II.
Transmits thrust load that presses to the side.

The collet member 13 fits into the center hole of the inserted magnetic recording medium 12 and clamps the magnetic recording medium 12 to the spindle mechanism 11. The magnetic recording medium 12 in this ramped state is rotated by the spindle mechanism 11. In this case, since the collet member 13 is configured to be rotatable about the clamper shaft 10 via the sliding bearing member 15, it rotates together with the magnetic recording medium 12 due to the rotational driving force of the spindle mechanism 11. Here, the basic material of the sliding bearing member 15 is, for example, the same material as the collet member 13, and is formed from a low-friction material containing lubricating oil or the like. The sliding bearing member 15 has the function of stably rotating the collet member 13, and also has the function of pushing the collet member 13 outward in the circumferential direction to ensure a clamped state.

Next, when the lever 22 is operated to release the clamp, the opener mechanism 17 acts to pull up the clamper spring 19. As a result, the sliding bearing member 15 separates from the collet member 13 and transmits a force that causes the collet member 13 to separate from the spindle mechanism 11. As a result, the clamped state of the magnetic recording medium 12 is released.

FIG. 2 is a side sectional view showing the configuration of a clamp mechanism according to a second embodiment of the present invention. In the same embodiment, the first
The bearing spring 16 in the embodiment is not provided. Further, the sliding bearing member 15 is attached to the collet member 13, and functions to stably rotate the collet member 13. Therefore, unlike the first embodiment, there is no action of pushing the collet member 13 outward in the circumferential direction when clamping or separating it from the collet member 13 when releasing the clamp. The mechanism in the second embodiment has the advantage of being simpler in structure than the first embodiment. Note that the other configurations and effects are the same as those shown in FIG. 1, so their explanations will be omitted.

[Effects of the Invention] As detailed above, according to the present invention, in the clamping mechanism of a floppy disk device, relatively low-cost sliding can be achieved without using a rolling bearing having a conventional high-cost ball bearing. A stable rotatable mechanism for the collet member can be realized using the bearing member. Therefore, as a result, the manufacturing cost of the entire clamp mechanism can be reduced.

[Brief explanation of the drawing]

1 is a side sectional view showing the configuration of a clamp mechanism according to a first embodiment of the present invention, FIG. 2 is a side sectional view showing the configuration of a clamp mechanism according to a second embodiment of the present invention, and FIG. The figure is a plan view of the first embodiment. DESCRIPTION OF SYMBOLS 10... Clamper shaft, 11... Spindle mechanism, 12... Magnetic recording medium, 13... Collet member, 15... Sliding bearing member, 17... Opener mechanism. Applicant's agent Patent attorney Takehiko Suzue

Claims (1)

[Claims] In a clamping mechanism of a floppy disk device that chucks and clamps a magnetic recording medium to a spindle mechanism, the central part of the magnetic recording medium is fitted into a central hole of the magnetic recording medium and the central portion of the magnetic recording medium is clamped to the spindle mechanism. a collet member for clamping the magnetic recording medium; and a sliding bearing provided at the center of the collet member so that the collet member can freely rotate around a clamp shaft while the magnetic recording medium is clamped to a spindle mechanism by the collet member. a member, an opener mechanism that uses the clamp shaft as a guide to press the collet member toward the spindle mechanism during clamping, and detaches the collet member from the spindle mechanism when the clamp is released; A clamping mechanism for a floppy disk device, comprising a thrust washer member that transmits motion to the collet member via the sliding bearing member.