JPH064452U - Motor lead nut moving structure - Google Patents

Abstract

(57) [Summary] [Purpose] To enable smooth movement of the lead nut along the guide shaft without requiring a high degree of parallelism between the guide shaft and the lead screw. [Structure] One end of the guide shaft 12 is supported via a bearing 14 made of an elastic member so that the guide shaft 12 can move in the radial direction, and the guide shaft 12 moves in the radial direction. 7 through holes 1
A member for preventing pressure contact of the guide shaft 12 with the inner peripheral edge of 1.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention is for positioning a head for reading a recording from a recording medium such as a floppy disk or an optical disk, or writing information on the recording medium depending on the type of the recording medium, with a specific portion of the recording medium. The present invention relates to a lead nut moving structure for a motor for moving the lead nut, preferably a stepping motor, and more particularly, to an improvement for smoothly moving the lead nut.

[0002]

[Prior art]

 In order to move the above-mentioned head, a rotation driving means such as a stepping motor has been conventionally used.

In general, the structure for moving the head by this stepping motor is such that a lead screw is connected to a rotating shaft of a motor body, and a lead nut for driving a head is screwed to the lead screw, and both ends are screwed together. The supported guide shaft is inserted into the through hole formed in the lead nut to prevent the lead nut from rotating.

According to this structure, when the stepping motor is driven to rotate its rotation shaft, the lead screw is driven, and the lead nut screwed to the lead screw has a guide shaft in its through hole. Since the lead nut is stopped by being inserted, the lead nut is moved along the guide shaft in the axial direction of the lead screw. Therefore, the head mounted on this lead nut also moves in synchronization with the lead nut.

[0005]

[Problems to be solved by the device]

 By the way, in order to move the lead nut in the axial direction of the lead screw in this manner, the guide shaft must be arranged in parallel with the lead screw.

That is, unless the guide shaft is arranged parallel to the lead screw, the guide shaft is pressed against the inner peripheral edge of the through hole of the lead nut depending on the axial position of the lead screw where the lead nut is located. The lead nut cannot move smoothly in the axial direction of the lead screw.

However, in the conventional lead nut moving structure of the stepping motor, the guide shaft is fixedly supported at both ends, and the inner diameter of the through hole of the lead nut is relatively large with the outer diameter of the guide shaft. Since the dimensions were such that they were dense, it was not possible to maintain smooth movement of the lead nut unless a high degree of parallelism was achieved between the guide shaft and the lead screw. Therefore, highly accurate assembly work is required, and the manufacturing process is complicated.

In view of the above-mentioned point, the present invention is a stepping motor lead nut capable of smoothly moving the lead nut along the guide shaft without requiring a high degree of parallelism between the guide shaft and the lead screw. It is intended to provide a mobile structure.

[0009]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the lead nut moving structure for a stepping motor according to claim 1 of the present invention is such that a lead screw is connected to a rotating shaft of a motor body, and a lead nut is screwed to the lead screw so that both ends are supported. In the guide nut inserted through the through hole formed in the lead nut to prevent the lead nut from rotating, one end of the guide shaft is inserted in the radial direction through a bearing made of an elastic member. It is characterized by being supported so that they can move.

Further, in the lead nut moving structure for a stepping motor according to a second aspect of the present invention, a lead screw is connected to a rotating shaft of a motor body, a lead nut is screwed to the lead screw, and a guide shaft supported at both ends is provided with the lead shaft. A guide nut is inserted through a through hole formed in the nut to prevent rotation of the lead nut, and the guide shaft is allowed to move in the radial direction through the through hole of the lead nut through which the guide shaft is inserted. It is characterized by having a relief.

[0011]

[Action]

 According to claim 1, since one end of the guide shaft is supported via the bearing made of an elastic member, the guide shaft can be supported even if a high degree of parallelism is not obtained between the guide shaft and the lead screw. The guide nut can be prevented from being pressed against the inner peripheral edge of the through hole of the lead nut by moving in the radial direction, and the lead nut can be smoothly moved along the guide shaft.

According to the second aspect of the present invention, since the clearance for allowing the guide shaft to move in the radial direction is provided in the through hole of the lead nut through which the guide shaft is inserted, the gap between the guide shaft and the lead screw is provided. Even if a high degree of parallelism does not appear in the guide shaft, it is possible to prevent the guide shaft from being pressed against the inner peripheral edge of the through hole of the lead nut by allowing the guide shaft to move along the relief. The lead nut can be moved smoothly.

[0013]

【Example】

 Hereinafter, the present invention will be described with reference to the embodiments shown in the drawings.

1 to 4 show a first embodiment of the present invention, of which FIG. 1 and FIG. 2 show the entire lead nut moving structure of a stepping motor.

In FIGS. 1 and 2, the lead nut moving structure has a horizontally arranged flat plate-shaped frame 1, and flat plate-shaped support walls 2 and 3 are provided at both ends of the frame 1. It is set up. A motor main body 4 of a stepping motor is supported on one of the support walls 2, and a rotation shaft (not shown) extending in the horizontal direction of the motor main body 4 faces the support wall 2 side, It is exposed through an opening (not shown) in the support wall 2. A bearing 5 is supported on the other support wall 3.

To the end of the rotary shaft of the motor body 4, one end of the lead screw 6 having an external thread 6A formed on the outer peripheral surface is connected so as to rotate integrally with the rotary shaft. The other end of the lead screw 6 is rotatably supported by the bearing 5 of the support wall 3.

A lead nut 7 is screwed onto the lead screw 6. As shown in FIG. 3, the lead nut 7 has a nut body 8, and a head mounting portion 9 for mounting a head (not shown) is formed on an upper portion of the nut body 8. . Further, a pair of screwing portions 10, 10 are provided at a lower portion of the nut body 8 at a distance from each other, and the male screw portion 6 A of the lead screw 6 is provided in each screwing portion 10. An internal thread portion 10A formed of an engagement pin or the like that can be screwed is formed.

Further, the nut body 8 is formed with a circular through hole 11 into which a guide shaft 12 described later is inserted. On the other hand, one end of the guide shaft 12 that is inserted into the through hole 11 is tightly fitted in a circular hole (not shown) formed in the support wall 2 and is fixedly supported. Reference numeral 12 extends in parallel with the lead screw 6. The distance between the guide shaft 12 and the lead screw 6 is set so that the male screw portion 6A of the lead screw 6 and the female screw portion 10A of the lead nut 7 are screwed into the through hole 11 of the lead nut 7. The size is set so that the id shaft 12 is inserted concentrically.

In this embodiment, in particular, the other end of the guide shaft 12 is supported so that the guide shaft 12 can move in its radial direction, as shown in detail in FIG.

That is, a circular opening 13 is formed in the support wall 3 concentrically with the guide shaft 12, and the circular opening 13 is made of an elastic material such as hollow rubber inside the circular opening 13. A bearing 14 is provided, and the bearing 14 holds the end of the guide shaft 12. Therefore, the guide shaft 12 is supported so as to bend and move in the radial direction.

Next, the operation of this embodiment having the above-described configuration will be described.

When the motor body 4 is driven to rotate its rotary shaft, the lead screw 6 connected to this rotary shaft integrally rotates, and the male screw portion 6 A of this lead screw 6 is screwed into the female screw of each screwing portion 10. The lead nut 7 with which the portion 10A is screwed is prevented from rotating by inserting the guide shaft 12 into the through hole 11, so that the lead nut 7 is attached to the lead screw 6 along the guide shaft 12. It will be moved in the axial direction. Therefore, the head (not shown) mounted on the lead nut 7 is also moved in synchronization with the lead nut 7.

According to the present embodiment, even if the guide shaft 12 is not parallel to the lead screw 6 to some extent, the guide shaft 12 supported by the bearing 14 made of an elastic member bends and moves in the radial direction. Therefore, the guide shaft 12 is not pressed against the inner peripheral edge of the through hole 11 of the lead nut 7 with a large pressure that hinders the smooth movement of the lead nut 7. Therefore, the lead nut 7 can be smoothly moved along the guide shaft 12 without producing a high degree of parallelism between the guide shaft 12 and the lead screw 6. As a result, the manufacturing process can be simplified as compared with the conventional one.

5 and 6 show a second embodiment of the present invention. Only the structure of the second embodiment different from that of the first embodiment will be described.

Also in this embodiment, the configuration shown in FIG. 1 of the first embodiment is common. Further, in the present embodiment, as shown in FIG. 5, the support structure on the side of the support wall 3 of the guide shaft 12 is a circular hole formed in the support wall 3 like the support structure in the support wall 2 of FIG. It is tightly fitted to 15 and is fixedly supported. Therefore, in this embodiment, the guide shaft 12 cannot move in the radial direction.

On the other hand, as shown in FIG. 6, the through hole 11 in which the guide shaft 12 is inserted in the lead nut 7 of the present embodiment is an elongated hole that is expanded in the radial direction of the lead screw 6. Therefore, even if the guide shaft 12 is not parallel to the lead screw 6, the guide shaft 12 does not come into pressure contact with the inner peripheral wall of the through hole 11. That is, the through hole 11 formed in the long hole constitutes a clearance through which the guide shaft can move in the radial direction.

According to such a configuration, even if the guide shaft 12 is not parallel to the lead screw 6 more or less, the guide shaft 12 corresponds to the space between the lead screw 6 and the guide shaft 12 and the guide shaft 12 penetrates the through hole of the lead nut 7. It is possible to move inside 11 in the direction of its major axis. Therefore, the lead nut 7 can be smoothly moved along the guide shaft 12 without producing a high degree of parallelism between the guide shaft 12 and the lead screw 6. As a result, the manufacturing process can be simplified as compared with the conventional one.

FIGS. 7 and 8 show a third embodiment of the present invention, which is a modification of the second embodiment described above. That is, as in the second embodiment, the support structure of the guide shaft on the side of the support wall on which the motor body is not supported is tightly fitted in the circular hole formed in this support wall and is fixedly supported. Also in this embodiment, the guide shaft cannot move in the radial direction.

Then, as shown in FIGS. 7 and 8, the through hole 11 in which the guide shaft 12 is inserted in the lead nut 7 of the present embodiment has a larger diameter than the outer diameter of the guide shaft 12. The guide shaft 12 is loosely inserted into the through hole 11. Inside the through hole 11, a bearing 16 made of an elastic material such as rubber is arranged inside the through hole 11 as in the bearing 14 of the first embodiment. The bearing 16 holds the guide shaft 12. As a result, the guide shaft 12 does not come into pressure contact with the inner peripheral wall of the through hole 11 even when the parallelism with the lead screw 6 is not obtained. That is, the through hole 11 formed to have a larger diameter than the outer diameter of the guide shaft 12 constitutes an escape through which the guide shaft can move in the radial direction. Further, annular grooves 17, 17 ... Are continuously provided on the outer peripheral surface of the bearing 16 in the axial direction of the bearing 16, so that the bearing 16 can be elastically deformed.

According to such a configuration, even if the guide shaft 12 is not parallel to the lead screw 6 a little, the guide shaft 12 corresponds to the space between the lead screw 6 and the guide shaft 12, and the guide shaft 12 penetrates the through hole of the lead nut 7. The bearing 16 can be moved in the radial direction of the through hole 11 by compressing the bearing 16 in the inside. Therefore, the lead nut 7 can be smoothly moved along the guide shaft 12 without requiring a high degree of parallelism between the guide shaft 12 and the lead screw 6. As a result, the manufacturing process can be simplified as compared with the conventional one.

It should be noted that the present invention is not limited to the above-described embodiments, and various modifications can be made as necessary.

[0032]

[Effect of device]

 As described above, according to the present invention, the lead nut can be smoothly moved along the guide shaft without producing a high degree of parallelism between the guide shaft and the lead screw. As a side effect, the manufacturing process can be simplified as compared with the conventional one.

[Brief description of drawings]

FIG. 1 is a front view showing a first embodiment of a lead nut moving structure for a stepping motor according to the present invention.

FIG. 2 is a left side view of FIG.

FIG. 3 is a side view of the lead nut of FIG.

FIG. 4 is a sectional view taken along line BB in FIG.

FIG. 5 is a left side view showing a second embodiment of the present invention.

6 is a side view of the lead nut of FIG.

FIG. 7 is a side view of a lead nut showing a third embodiment of the present invention.

FIG. 8 is a sectional view taken along line AA of FIG.

[Explanation of symbols]

 1 frame 2,3 support wall 4 motor main body 5,14,16 bearing 6 lead screw 6A screw part 7 lead nut 11 through hole 12 guide shaft 13 circular opening

Claims (2)

[Scope of utility model registration request] 1. A lead screw is connected to a rotating shaft of a motor main body, a lead nut is screwed into the lead screw, and guide shafts supported at both ends are inserted into through holes formed in the lead nut. In a lead-nut moving structure for a motor configured to prevent rotation, one end of the guide shaft is supported via a bearing made of an elastic member so that the guide shaft can move in the radial direction. Lead nut moving structure. 2. A lead screw is connected to a rotary shaft of a motor main body, a lead nut is screwed into the lead screw, and guide shafts supported at both ends are inserted into through holes formed in the lead nut. In a lead nut moving structure for a motor configured to prevent rotation, a clearance is provided in a through hole of the lead nut through which the guide shaft is inserted so that the guide shaft can move in the radial direction. Motor lead nut moving structure.