JPS63244362A - Disk rotation and driving device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a device for rotationally driving a disk used for magnetic recording or the like.

[Conventional technology]

6 to 11 are diagrams showing a conventional disk rotation drive device disclosed in, for example, Japanese Utility Model Application Publication No. 60-3950, in which FIG. 6 is a plan view and FIG. −■ line cross-sectional view,
FIG. 8 is a plan view with the rotating plate removed.

FIG. 9 is an enlarged cross-sectional view taken along line IX-II in FIG. 8, and FIGS. 10 and 11 are operation explanatory diagrams.

In the figure, (1) is a recording medium such as a disk-shaped magnetic disk 1.

(2) is a rotating plate fixed at the center of the recording medium (1),
A square center hole (2a) is provided in the center.
There is a rectangular window hole (2a) at a position eccentric to 2a).
b) is provided. (3) is a motor (not shown)
A pedestal fixed to the rotating shaft (4), (5) is a pedestal (3)
An arc plate-shaped arm plate (7) is disposed on the back surface of the pedestal (3), and one end thereof is pivotally supported by a pin (6) planted on the back surface of the pedestal (3) so as to be able to rotate and displace in the axial direction. ) is a driving pin consisting of a roller supported on the other end of the arm plate (5), and (8) is a receiving pin (
3), one end of which is fixed to the pedestal (3), and the other end of which is an elastic body made of a wire spring that engages and presses the other end of the arm plate (5).

A conventional disk rotation drive device is configured as described above, and the recording medium il+ is moved from the side.

The center hole (2a) of the rotating plate (2) is fitted into the tip of the rotating shaft (4). At this time, if the drive pin (7) is at the position (7A) in FIG. 6, it is pushed down by the back surface of the two-rotation plate (2). Next, the motor rotates the rotating shaft (4).
When the cradle (3) starts rotating, the pedestal (3) also rotates and the drive pin (7)
) slides on the back side of the rotary plate (2), and when it reaches the fit (7B) corresponding to the window hole (2b), it is pushed up by the restoring force of the elastic body (8) and into the window hole (2b). inserted.

When the pedestal (3) further rotates, the drive pin (7) moves into the window hole (
2b) and comes to the end of the window hole (2b) as shown in FIG. 6, after which the rotary plate (2) and the pedestal (3) rotate at the same speed. At this time, the drive pin (7) is pressed against the inner edge of the window hole (2b) by the elastic body (8) and applies a force in the radial direction to the two-rotation plate (2). As a result, the rotary plate (2) with respect to the two rotary shafts (4), that is, the recording medium txt
positioning is performed.

[Problem that the invention seeks to solve]

In the conventional disk rotation drive device as described above, the drive pin (7) is displaced between the protruding position and the sunken position shown by the chain line in FIG. (5
) and the head of the pin (6). Therefore, when the drive pin (7) is displaced to the protruding position, if one end of the arm plate (5) shifts by the gap A, as shown by the chain line in FIG. 11, the position of the drive pin (7) also changes accordingly. This causes an error in the relative position of the nine-turn plate (2) with the window hole (2b), resulting in a problem that the positioning accuracy of the recording medium il+ deteriorates.

The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a disk rotation drive device that can reduce the displacement of the arm plate and improve the positioning accuracy of the recording medium.

[Means for solving problems]

The disk rotation drive device according to the present invention is provided on the surface of the arm plate facing the pedestal or the surface facing the head of the pin.

A protrusion is formed to restrict displacement of the drive pin in the protruding direction.

[For production]

In this invention, a protrusion is formed on the arm plate to restrict displacement of the drive pin in the protruding direction.

Although there is no change in the sinking depth of the drive pin, the gap between the arm plate support portions at the protruding position of the drive pin becomes smaller, and the positional deviation when the drive pin protrudes becomes smaller.

〔Example〕

1 to 4 and 6 are views showing one embodiment of the present invention, and FIG. 1 is a front view with the rotating plate removed.

FIG. 2 is a plan view, FIG. 3 is a cross-sectional view taken along line 1 in FIG. 2, and FIG. 4 is a back view, and parts similar to those of the conventional device are designated by the same reference numerals.

In the figure, aυ is the receiving plate fixed at rotation @tl (4), +
Reference numeral 13 is an adsorption plate made of a disc-shaped permanent magnet fixed to the receiving plate aυ.A hollow space (12a) is provided near one periphery, and the arm is attached to a headed pin (6) set on the back side. Board (5)
One end is pivotally supported so that it can be rotated and displaced in the axial direction, and a pedestal (3) is constituted by a receiving plate (1 piece) and a suction plate α2. 3) has a protrusion (5) on the opposite surface.
a) and a drive pin (7) supported at the other end of the arm plate (5) projects from the cavity (12a). Furthermore, two support shafts 3 are provided on the back surface of the suction plate az, and an elastic body (8) made of a wire spring is hooked to these. The tip of the elastic body (8) is connected to the arm plate (5) as shown in Fig. 4.
A gap X is created between the drive pin (7) and the inner edge of the cavity (12a) by contact with the other end.

When the 9-rotation plate (2) is not present in the disk rotation drive device configured as described above.

The arm plate (5) is attracted to the suction plate α2, and there is a gap X between the arm plate (5) and the tip of the elastic body (8). Therefore, when the drive pin (7) is pushed down by the rotary plate (2), the elastic body (8) does not act.At this time, the arm plate (5) is in the position shown by the chain line in Figure 1, and the protrusion (5a
) has no effect, and the depression depth of the drive pin (7) is the same as in the conventional device.

When the suction plate aa rotates and the drive pin (7) comes to the position corresponding to the window hole (2b), the arm plate (5) is attracted to the suction plate H, and the drive pin (7) is placed in the window hole (2b). inserted within.

At this time, the arm plate (5) is in the position shown by the solid line in FIG. 1, and the protrusion (5a) is in contact with the back surface of the pedestal (3).

The gap B in the support part of the arm plate (5) is the gap A in Figure 10.
becomes smaller than Therefore, the gap B between the arm plates (5)
The positional deviation of the drive pin (7) is also reduced, and the positioning accuracy of the recording medium (1) is increased.

Furthermore, the suction plate α rotates, and the drive pin (7) moves into the window hole (2).
When it comes into contact with the extension line b), the arm plate (5) rotates and comes into contact with the elastic body (8), and this force applies a centering force to the rotation axis (4) of the rotary plate (2). This is the same as the conventional device.

FIG. 5 is a front view showing another embodiment of this invention.

The protrusion of the arm plate (5) is provided between the head of the pin (6) of the arm plate (5), and its function is the same as that of the previously described embodiment.

〔Effect of the invention〕

As explained above, in this invention, a protrusion is formed on the surface of the arm plate facing the pedestal or the surface facing the head of the pin to restrict the displacement of the driving pin in the protruding direction, so that the sinking depth of the driving pin can be increased. The gap between the arm plate supports at the protruding position of the drive pin is reduced without affecting the protrusion of the drive pin, and the positional deviation when the drive pin protrudes is small, which has the effect of improving the positioning accuracy of the recording medium.

[Brief explanation of drawings]

÷ Figures 1 to 3 are diagrams showing an embodiment of a disk rotation drive device according to the present invention. Figure 1 is a front view with the rotating plate removed, and Figure 2 is a plan view of Figure 1. . 3 is a sectional view taken along line 1-1 in FIG. 2, FIG. 4 is a back view, and FIG. 5 is a front view showing another embodiment of the invention. Fig. ε is a plan view showing the present invention and a conventional disk rotation drive device, Figs. 8 is a plan view with the rotating plate removed from FIG. 6, FIG. 9 is an enlarged cross-sectional view taken along the line ■--■ in FIG. 8, and FIGS. 10 and 11 are explanatory views of the operation. In the figure, (11 is a recording medium, (2) is a rotating plate, (2a)
is the center hole + (2b) is the window hole, (3) is the pedestal, (4) is the rotating shaft, (5) is the arm plate, (5a) is the protrusion, (6) is the pin, (7) is the drive pin . (8) is an elastic body, and α2 is a suction plate. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (3)

[Claims] (1) A rotary plate fixed to a plate-shaped recording medium, having a central hole in the center into which the tip of a rotating shaft of an electric motor is loosely fitted, and a window hole located eccentrically with respect to the central hole; A pedestal arranged corresponding to the rotary plate and fixed to the rotation shaft, and a pin with a head arranged on the back side of the pedestal and having one end planted in the pedestal, so as to be movable in the axial direction. A held arm plate,
A driving pin supported by the other end of the arm plate and protruding through the cradle while the arm plate is in contact with the cradle to engage and move in a window hole of the rotary plate; and a biasing body that engages with the arm plate to displace the drive pin in the projecting direction, and the drive pin is provided on a surface of the arm plate facing the pedestal or a surface facing the head of the pin. A disk rotation drive device formed with a protrusion that restricts displacement of the pin in the above-mentioned protruding direction. (2) A disk rotation drive device according to claim 1, which uses a permanent magnet fixed to a pedestal as a biasing member. (3) The disk rotation drive device according to claim 1, which uses an elastic body provided on the back surface of the pedestal as a biasing body.