JPH0235378B2 - - Google Patents

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.
When the medium 2 is positioned on the spindle 1, by moving the hub frame 4 downward, the cone 6 is pushed downward via the spring 5, thereby causing the clamp 3 to correspond to the spindle 1.
A medium 2 is held between a spindle 1 and a clamp 3.

However, in this configuration, when the cone 6 is pushed downward via the spring 5, the clamp 3 is pushed down, and after the medium 2 is sandwiched between the cone 6 and the spindle 1, the cone 6 is further moved downward.
Since the clamp 3 also acts to spread around the fulcrum 3a, this may damage the inner circumferential surface of the medium 2.

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

Here, 1, 2, and 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. Reference numeral 8 denotes a clamp corresponding to the clamp 3 in FIG.
has. Reference numeral 10 denotes a protrusion provided on the spindle 1. When the clamp 8 is attached to the spindle 1, the protrusion 10 first deforms the portion of the clamp 8 corresponding to the cone 6 in response to the recess 9, and then the cone 6
I am trying to be under pressure from this.

FIG. 3 shows an elastic body 1 in place of the protrusion 10 in FIG.
1. In the embodiment using the ball 12, the elasticity of the elastic body 11 in this case is such that it can deform the corresponding portion 8' of the cone 6 of the clamp 8.

As described 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 corresponding portion 8' of the cone 6 of the clamp 8 is pressed down before being made to correspond to the spindle 1 (before holding the medium 2).
can be deformed using the fulcrum 9, and by expanding the part 8' of the clamp 8 outward by the cone 8, the part 8' comes into close contact with the inner wall of the spindle 1, and is connected to the inner diameter of the medium 2 from below. After matching the inner diameter of the spindle 1, the medium 2 is clamped between 8 and 1. Therefore, the inner peripheral surface of the medium is not damaged.

[Brief explanation of drawings]

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, 6... Cone, 8... Clamp.

Claims (1)

[Claims] 1. A clamp that has a hollow engagement part that can be inserted into the center hole of a magnetic recording medium and has a ridge part that can press the magnetic recording medium, a recess provided at the bottom of this clamp, and a A clamp movable shaft that moves the clamp up and down via an attached cone, and a protrusion that clamps the magnetic recording medium together with the eaves of the clamp when the clamp is inserted, and that presses the recess before clamping. a spindle for rotating the magnetic recording medium, and before pressing down the clamp and holding the medium together with the spindle, pressing the concave portion with the protrusion to deform the side surface of the engaging portion; A media clamping device characterized by not damaging the inner peripheral surface of the media.