JPH0668869B2 - Disk rotation drive - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention relates to an apparatus for rotationally driving a disk used for magnetic recording or the like.

[Conventional technology]

FIGS. 6 to 11 are views showing a conventional disk rotation drive device disclosed in, for example, Japanese Utility Model Laid-Open No. 60-3950, FIG. 6 is a plan view, and FIG. 7 is a VII of FIG. FIG. 8 is a sectional view taken along line VII, FIG. 8 is a plan view with the rotary plate removed, FIG. 9 is an enlarged sectional view taken along line IX-IX of FIG. 8, and FIGS. 10 and 11 are operation explanatory views.

In the figure, (1) is a disk-shaped recording medium such as a magnetic disk, (2) is a rotating plate fixed in the center of the recording medium (1), and a square-shaped center hole (2a) is provided in the center. A substantially rectangular window hole (2b) is provided at a position eccentric to the center hole (2a). (3) is a pedestal fixed to the rotating shaft (4) of a motor (not shown), (5) is placed on the back surface of the pedestal (3), and one end thereof is planted on the back surface of the pedestal (3). Arm plate in the shape of an arc plate pivotally supported on the pin (6) so as to be rotatable and axially displaceable, and (7) is a drive pin consisting of a roller supported on the other end of the arm plate (5). ， (8)
Is an elastic body consisting of a wire spring arranged on the back surface of the cradle (3), one end of which is fixed to the cradle (3) and the other end of which is engaged with and presses the other end of the arm plate (5). Is.

The conventional rotary drive device for the disk is configured as described above, the recording medium (1) is moved from the side, and the central hole (2a) of the rotary plate (2) is located at the tip of the rotary shaft (4). Be inserted. At this time, if the drive pin (7) is located at the position (7A) in FIG. 6, it is pushed down by the back surface of the rotary plate (2). Next, when the rotating shaft (4) starts to rotate by the motor, the pedestal (3)
Also rotates, the drive pin (7) slides on the back surface of the rotating plate (2), and when it reaches the position (7B) corresponding to the window hole (2b), it is pushed up by the restoring force of the elastic body (8). And is inserted into the window hole (2b). When the pedestal (3) is rotated further, the drive pin (7) is locked in the window hole (2
It rolls along the inner edge of b) and, as shown in Fig. 6, the window hole (2
After coming to the end of b), the rotary plate (2) and the pedestal (3) rotate at a constant speed thereafter. 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 radial force to the rotary plate (2). As a result, the rotary plate for the rotary shaft (4) is
(2) That is, the positioning of the recording medium (1) is performed.

[Problems to be solved by the invention]

In the conventional disk rotation driving device as described above, since the drive pin (7) is displaced between the projecting position and the sinking position shown by the chain line in FIG. 10, the arm plate (5) is not supported by the arm plate. (5) and pin
A gap A is required between the heads of (6). Therefore, when the drive pin (7) is displaced to the projecting position, if one end of the arm plate (5) is displaced by the gap A, as shown by the chain line in FIG. 11,
Along with that, the position of the drive pin (7) also shifts,
There is a problem that an error occurs in the relative position of the rotating plate (2) with respect to the window hole (2b) and the positioning accuracy of the recording medium (1) deteriorates.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a disk rotation drive device capable of reducing the displacement of the arm plate and improving the positioning accuracy of the recording medium.

[Means for solving problems]

A rotary drive device for a disk according to the present invention is provided in the axial direction of the headed pin in the vicinity of the headed pin on the surface facing the pedestal of the arm plate or the surface facing the head of the headed pin. Is formed to regulate the displacement of the.

[Action]

According to the present invention, since the arm plate is formed with the protrusion for restricting the axial displacement of the headed pin, the sinking depth of the drive pin does not change, but the arm plate at the projecting position of the drive pin does not change. The gap between the supporting parts is reduced, and the displacement of the drive pin when protruding is reduced.

〔Example〕

FIGS. 1 to 4 and 6 are views showing an embodiment of the present invention. FIG. 1 is a front view with a rotating plate removed, FIG. 2 is a plan view, and FIG. 3 is a view of FIG. A sectional view taken along line III-III and FIG. 4 are rear views, and the same parts as those of the conventional device are denoted by the same reference numerals.

In the figure, (11) is a receiving plate fixed to the rotating shaft (4), and (12) is a receiving plate.
An attraction plate consisting of a disk-shaped permanent magnet fixed to (11),
A hollow space (12a) is formed near the periphery, and one end of the arm plate (5) is pivotally supported by a headed pin (6) on the back surface so that one end of the arm plate (5) can be rotated and axially displaced. In addition, the receiving plate (11) and the suction plate (12) constitute the receiving table (3). Arm plate (5) cradle (3)
A protrusion (5a) is formed on the surface opposite to, and the drive pin (7) supported by the other end of the arm plate (5) projects from the void (12a). Further, two support shafts (13) are provided on the back surface of the suction plate (12), and an elastic body (8) made of a wire spring is hooked on the support shafts (13). Then, as shown in FIG. 4, the tip of the elastic body (8) is brought into contact with the other end of the arm plate (5) by contact between the drive pin (7) and the inner edge of the void (12a), A gap X is created.

In the rotary drive device of the disk configured as described above, when the rotary plate (2) is not present, the arm plate (5) is attracted to the suction plate (12), and the arm plate (5) and the elastic body are There is a gap X between the tip of (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 Fig. 1, the protrusion (5a) has no effect, and the drive pin
The settlement depth of (7) is the same as that of the conventional device.

When the suction plate (12) rotates and the drive pin (7) comes to a position corresponding to the window hole (2b), the arm plate (5) is sucked by the suction plate (12),
The drive pin (7) is inserted into the window hole (2b). At this time,
The arm plate (5) is at the position shown by the solid line in Fig. 1, and the protrusion (5a)
Since it contacts the back surface of the pedestal (3), the movement distance of the support side end of the arm plate (5) is shown in FIG. 11 when the end of the arm plate (5) shown by the chain line in FIG. Since the distance to the end of the arm plate (5) indicated by the chain line is smaller, the positional deviation of the drive pin (7) is also smaller and the positioning accuracy of the recording medium (1) is higher.

Furthermore, the suction plate (12) rotates, and the drive pin (7) is in the window hole (2b).
When it contacts the inner edge of the arm plate (5) rotates to contact the elastic body (8), and the force exerts the centering force on the rotating shaft (4) of the rotating plate (2). It is similar to the conventional device.

FIG. 5 is a front view showing another embodiment of the present invention.
The protrusion of (5) is provided between the arm plate (5) and the head of the pin (6), and its function is the same as that of the above-mentioned embodiment.

〔The invention's effect〕

As described above, according to the present invention, the displacement of the headed pin in the axial direction is made in the vicinity of the headed pin on the surface facing the cradle of the arm plate or the surface facing the head of the headed pin. Since the regulating projection is formed, the gap of the arm plate support portion at the projecting position of the drive pin is reduced without affecting the sinking depth of the drive pin, and the displacement of the drive pin at the time of projecting is small, and the recording medium There is an effect that the positioning accuracy of can be improved.

[Brief description of drawings]

1 to 4 are views showing an embodiment of a disk rotation driving device according to the present invention. FIG. 1 is a front view with a rotary plate removed, and FIG. 2 is a plan view of FIG. Figure is III of Figure 2
-III sectional view, FIG. 4 is a back view, FIG. 5 is a front view showing another embodiment of the present invention, FIG. 6 is a plan view showing a rotary drive device of the present invention and a conventional disk, FIG. 11 to 11 are views showing a conventional rotary drive device for a disk, FIG. 7 is a sectional view taken along the line VII-VII in FIG. 6, and FIG. 8 is a plan view in which the rotary plate is removed from FIG. FIG. 9 is an enlarged cross-sectional view taken along the line IX-IX of FIG. 8, and FIGS. 10 and 11 are operation explanatory views. In the figure, (1) is the recording medium, (2) is the rotating plate, (2a) is the center hole,
(2b) is a window hole, (3) is a pedestal, (4) is a rotating shaft, (5) is an arm plate,
(5a) is a protrusion, (6) is a pin with a head, (7) is a drive pin,
(8) is an elastic body and (12) is a suction plate. In the drawings, the same reference numerals indicate the same or corresponding parts.

Claims (3)

[Claims] 1. A rotating plate fixed to a plate-shaped recording medium, having a central hole in the center thereof into which the tip of a rotating shaft of an electric motor is loosely fitted, and having a window hole at a position eccentric to the central hole. Correspondingly arranged and fixed to the rotary shaft, and a pedestal, which is arranged on the back surface of the pedestal and has one end erected on the pedestal, is rotatably supported in the axial direction. An arm plate, a drive pin that is supported by the other end of the arm plate and that protrudes through the pedestal in a state where the arm plate is in contact with the pedestal and moves by engaging with a window hole of the rotating plate; A urging member provided on a pedestal for engaging the arm plate and displacing the drive pin in the radial direction of the rotation shaft, and a face of the arm plate facing the pedestal or the headed pin. It is provided near the headed pin on the surface facing the head of the head and the arm plate is displaced in the axial direction of the headed pin. Rotary drive of the disk obtained by forming a protrusion win. 2. A disk rotation drive device according to claim 1, wherein an attraction plate made of a permanent magnet is provided on the outer periphery of the pedestal to attract the arm plate in the protruding direction of the drive pin. 3. The disk rotation drive device according to claim 1, wherein an elastic body provided on the back surface of the pedestal is used as the urging body.