JPS6018851A - Medium clamping device - Google Patents

Abstract

PURPOSE:To protect the inner circumferential surface from breakage by providing a projection at a part of a spindle and changing frequently the diameter of the medium holding position of a clamp with a part of the clamp defined as a fulcrum when the clamp is shifted toward the spindle. CONSTITUTION:A clamp mobile shaft 7 is fixed to a cone 6 at its end of one side and has a hollow part 9 at the lower part of a clamp 8. A projection 10 of a spindle 1 gives deformation to the clamp 8 at an area corresponding to the cone 6 in response to the part 9 and at the same time receives the pressing force of the cone 6 when the clamp 8 corresponds to the spindle 1. In such a way, the clamp 8 is pressed down by the cone 6 through the shaft 7 and can be deformed with a part 8' of the clamp 8 corresponding to the cone 6 defined as a fulcrum before the clamp 8 is set oppositely to the spindle 1. Then the part 8' is extended to the outside by the cone 6. Thus the part 8' has close contact with the inner wall of the spindle 1, and the inner diameter of a medium 2 is set oppositely to tht of the spindle 1 from the lower part. Then the medium 2 is clamped between the clamp 8 and the spindle 1. This device protects the inner circumferential surface of the medium 2 from damage.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a medium clamping device for a magnetic disk, and its purpose is to protect the medium.

Conventionally, as shown in FIG. 1, in this type of device, a clamp 3 is movably provided on a spindle 1, and when a medium 2 is positioned on the spindle 1, the hub frame 4 is moved downward. By pushing the cone 6 downwards via the spring 5 and thereby aligning the clamp 3 with the spindle 1, the medium 2 is placed between the spindle 1 and the clamp 3.
I try to keep it.

However, in this configuration, when the cone 6 is pushed downward via the spring 5, the clamp 3 is pushed down, and the spindle 1
By moving the cone 6 further downward after sandwiching the medium 2 between the clamps 3 and 3a, the clamp 3 also acts to expand using the fulcrum 3a, which may damage the inner circumferential surface of the medium 2. Sometimes.

The present invention eliminates such drawbacks, and one embodiment thereof will be described below with reference to FIG. 2.

Here, 1.2.6 are the same as those with the same symbols in FIG. 1, and their explanation will be omitted. A movable clamp shaft 7 has one end fixed to the cone 6, and is fixed to the hub frame 4 in FIG. A clamp 8 corresponds to the clamp 3 in FIG. 1, and has a recess 9 at the bottom. 10 is a projection provided on the spindle 1. When the lamp 8 corresponds to the spindle 1, the projection 1o of the groove corresponds to the recess 9, and the portion of the clamp 8 corresponding to the cone 6 is deformed, and the cone 6 They are subject to oppression.

FIG. 3 shows an embodiment in which an elastic body 11° ball 12 is used in place of the protrusion 1o in FIG. It consists of things like

As explained above with reference to the embodiments, according to the present invention, the clamp 8 is pushed down by the cone 6 through the shaft 7, and the spindle 1
Since the corresponding portion 8' of the cone 6 of the clamp 8 can be deformed using the fulcrum 9 before the corresponding part 8' of the clamp 8 is made to correspond to the media 2 (before holding the medium 2), the cone 8 allows the part 8' of the clamp 8 to be By spreading 8' to the inner wall of the spindle 1, the inner diameter of the medium 2 corresponds to the inner diameter of the spindle 1 from below, and then the medium 2 is clamped between 8 and 1.

Therefore, the inner peripheral surface of the medium is not damaged.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a conventional medium clamping device, FIG. 2 is a cross-sectional view of a medium clamping device according to an embodiment of the present invention, and FIG. 3 is a cross-sectional view of another embodiment. 1...Spindle, 2...Medium L 6...
...Cone, 8...Clamp. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
figure

Claims (2)

[Claims] (1) A media clamping device in which a portion of a spindle that holds a medium between it and a clamp pressed through a cone is provided with means for deforming a portion of the clamp before holding the medium. (2) A patent claim in which the deforming means consists of a protrusion or an elastic protrusion, and when the clamp moves in the spindle direction, it first deforms a part of the clamp and uses that part as a fulcrum to deform the diameter of the medium holding position of the clamp. The media clamping device according to item 1.