JP2021038757A - Self-propelled slider and direct-acting mechanism - Google Patents

Abstract

To provide a self-propelled slider having a structure capable of downsizing a direct-acting mechanism equipped with a rack and a pinion, and a direct-acting mechanism.SOLUTION: A self-propelled slider movable in a predetermined direction with respect to a bolt 22 extending in a predetermined direction, includes a driving portion 40 that has a motor 41, a driving helical gear 51 rotated by the driving portion, and a gear mechanism portion 50 that has a driven helical gear 52 engaged with the driving helical gear. The driven helical gear is a nut having a female screw portion 52d engaged with a male screw portion 22a of a bolt on an inner peripheral surface. A rotation axis J3 of the driving helical gear and a rotation axis J1 of the driven helical gear are at twisted positions to each other.SELECTED DRAWING: Figure 5

Description

The present invention relates to a self-propelled slider and a linear motion mechanism.

A linear motion mechanism that converts the rotation of a motor into linear motion is known. For example, Patent Document 1 describes a work lifting device including a linear motion mechanism composed of a pinion rotated by a motor and a rack that meshes with the pinion.

Japanese Unexamined Patent Publication No. 1-164577

In a linear motion mechanism including a rack and a pinion, if an external force is applied to the rack or the pinion while the power of the motor is turned off, the pinion may rotate and the relative position between the rack and the pinion may shift. Therefore, it is necessary to provide a lock mechanism or the like for holding the relative position between the rack and the pinion, and there is a problem that the entire linear motion mechanism becomes large.

One aspect of the present invention is to provide a self-propelled slider having a structure that can be miniaturized and a linear motion mechanism in view of the above circumstances.

One aspect of the self-propelled slider of the present invention is a self-propelled slider that can move in the predetermined direction with respect to a bolt extending in a predetermined direction, and is rotated by a drive unit having a motor and the drive unit. It includes a drive wheel gear and a gear mechanism unit having a driven gear that meshes with the drive gear. The driven gear is a nut having a female threaded portion on the inner peripheral surface that meshes with the male threaded portion of the bolt. The rotating shaft of the driving hasba gear and the rotating shaft of the driven hasba gear are in twisted positions with each other.

One aspect of the linear motion mechanism of the present invention includes a bolt extending in a predetermined direction and the self-propelled slider attached so as to be movable in the predetermined direction with respect to the bolt.

Another aspect of the linear motion mechanism of the present invention is a drive unit having a motor, a drive gear that is rotated by the drive unit, and a gear mechanism unit that has a driven gear that meshes with the drive gear. A bolt that is connected to a gear mechanism and extends in a predetermined direction is provided. The driven gear is a nut having a female threaded portion on the inner peripheral surface that meshes with the male threaded portion of the bolt. The rotating shaft of the driving hasba gear and the rotating shaft of the driven hasba gear are in twisted positions with each other.

According to one aspect of the present invention, the self-propelled slider and the linear motion mechanism can be miniaturized.

FIG. 1 is a perspective view showing an elevating device provided with the linear motion mechanism of the present embodiment. FIG. 2 is a perspective view showing a part of the linear motion mechanism of the present embodiment. FIG. 3 is a cross-sectional view showing a part of the linear motion mechanism of the present embodiment, and is a cross-sectional view taken along the line III-III in FIG. FIG. 4 is a perspective view showing a drive unit and a gear mechanism unit of the present embodiment. FIG. 5 is a perspective view showing a drive unit, a drive gear, and a driven gear according to the present embodiment. FIG. 6 is a perspective view showing a part of the cover member and the gear mechanism portion of the present embodiment. FIG. 7 is a cross-sectional view showing a part of the linear motion mechanism of the present embodiment, and is a cross-sectional view of VII-VII in FIG. FIG. 8 is a cross-sectional view showing a part of the linear motion mechanism of the present embodiment, and is a cross-sectional view of VIII-VIII in FIG. FIG. 9 is a cross-sectional view showing a part of the linear motion mechanism of the present embodiment, and is a cross-sectional view of IX-IX in FIG. FIG. 10 is a perspective view showing a part of the cover member of the present embodiment. FIG. 11 is a cross-sectional view showing a part of the linear motion mechanism of the present embodiment, and is a cross-sectional view of XI-XI in FIG. FIG. 12 is a perspective view showing a second sliding portion of the present embodiment. FIG. 13 is an exploded perspective view showing the second sliding portion of the present embodiment. FIG. 14 is a perspective view showing another example of the linear motion mechanism of the present embodiment.

In the following description, the direction parallel to the Z axis shown in each figure is defined as the vertical direction, and is referred to as "vertical direction Z". The positive side of the vertical direction Z, that is, the + Z side is defined as the upper side in the vertical direction, and is simply called "upper side". The negative side of the vertical direction Z, that is, the −Z side is defined as the lower side in the vertical direction, and is simply referred to as the “lower side”. The direction parallel to the Y axis shown in each figure is referred to as "width direction Y". The width direction Y is a horizontal direction orthogonal to the vertical direction Z. The positive side of the width direction Y, that is, the + Y side is called "one side in the width direction". The negative side of the width direction Y, that is, the −Y side is called “the other side in the width direction”. The direction parallel to the X axis shown in each figure is referred to as "front-back direction X". The front-back direction X is a horizontal direction orthogonal to the vertical direction Z, and is a direction orthogonal to the width direction Y. The positive side of the front-back direction X, that is, the + X side is called the "front side". The negative side of the front-back direction X, that is, the -X side is called the "rear side".

In this embodiment, the vertical direction Z corresponds to a predetermined direction. Further, the vertical direction, the front-rear direction, the upper side, the lower side, the front side, and the rear side are simply names for explaining the relative positional relationship of each part, and the actual arrangement relationship and the like are the arrangements indicated by these names. It may be an arrangement relationship other than the relationship.

The linear motion mechanism 10 of the present embodiment shown in FIG. 1 is provided in the elevating device 1 capable of moving the object MO in the vertical direction Z. The object MO is not particularly limited. The object MO is, for example, a desk, a display, or the like. The elevating device 1 includes two linear motion mechanisms 10. The two linear motion mechanisms 10 are arranged at intervals in the width direction Y. The linear motion mechanism 10 includes a slide guide 20 and a self-propelled slider 30. The self-propelled slider 30 is a slider that is movably attached to the slide guide 20 in the vertical direction Z. In the present embodiment, the elevating device 1 supports the object MO from below by the self-propelled sliders 30 in the two linear motion mechanisms 10.

As shown in FIGS. 2 and 3, the slide guide 20 has a guide member 21 and a bolt 22. That is, the linear motion mechanism 10 includes a guide member 21 and a bolt 22. In the present embodiment, the guide member 21 is a substantially square tubular rail extending in the vertical direction Z. A slit-shaped opening 23a extending in the vertical direction Z is provided on the wall portion on the front side of the guide member 21. The opening 23a is provided over the entire vertical direction Z of the guide member 21. As shown in FIG. 3, since the opening 23a is provided, the guide member 21 has an angular C-shape that opens to the front side when viewed in the vertical direction Z. The opening 23a is provided at a position of the wall portion on the front side of the guide member 21 that is biased toward the other side in the width direction from the center in the width direction Y. In the present embodiment, the opening direction of the opening 23a is the front-rear direction X.

The front wall portion of the guide member 21 has an opening 23a that divides the wall portion in the width direction Y and extends in the vertical direction Z. In the following description, the portion of the front wall portion of the guide member 21 located on one side in the width direction of the opening 23a is referred to as the first front wall portion 21a, and the opening portion of the front wall portion of the guide member 21. The portion of 23a located on the other side in the width direction is referred to as a second front wall portion 21b. In the present embodiment, the first front wall portion 21a and the second front wall portion 21b correspond to portions of the guide member 21 located on both sides of the opening 23a in the width direction.

The guide member 21 has a guide groove 23 extending in the vertical direction Z. The guide groove 23 is a groove that is recessed on the rear side and opens on the front side. The guide groove 23 has a groove main body portion 23b and the above-mentioned opening 23a. The inside of the groove main body 23b is the inside of a substantially square tubular guide member 21. The dimension of the opening 23a in the width direction Y is smaller than the dimension of the groove body 23b in the width direction Y. That is, the guide groove 23 has a narrow width at the opening 23a. The dimension of the groove main body 23b in the width direction Y corresponds to the maximum width of the guide groove 23, and is larger than the outer diameter of the driven gear 52, which will be described later. The width of the opening 23a, that is, the dimension in the width direction Y is smaller than the outer diameter of the driven gear 52. The dimension of the opening 23a in the width direction Y is, for example, 10 mm or less. The dimension of the opening 23a in the width direction Y is preferably 8 mm or less.

As shown in FIG. 4, the bolt 22 extends in the vertical direction Z. The bolt 22 has a columnar shape centered on a central axis J1 extending in the vertical direction Z. The bolt 22 has a male screw portion 22a on the outer peripheral surface. The male screw portion 22a is provided on the entire outer peripheral surface of the bolt 22. As shown in FIG. 3, the bolt 22 is housed inside the guide groove 23. More specifically, the bolt 22 is housed in a portion of the inside of the groove main body portion 23b that is closer to one side in the width direction. Although not shown, both ends of the bolt 22 in the vertical direction Z are fixed to the inner wall surface of the guide member 21 by, for example, screws. As a result, the bolt 22 is fixed to the guide member 21 in a state of being housed inside the guide groove 23. Therefore, in this embodiment, the bolt 22 does not rotate.

The self-propelled slider 30 includes a drive unit 40, a gear mechanism unit 50, and a cover member 60. The drive unit 40 is a portion that serves as a power source for moving the self-propelled slider 30 in the vertical direction Z. The drive unit 40 is provided outside the guide groove 23. The drive unit 40 includes a motor 41, a transmission mechanism 42, and an output shaft 43. As shown in FIG. 4, the motor 41 has a columnar shape extending in the front-rear direction X about the central axis J2. The central axis J2 is arranged away from the central axis J1 of the bolt 22 on the other side in the width direction. The central axis J1 and the central axis J2 are twisted to each other. The central axis J1 and the central axis J2 are orthogonal to each other in the width direction Y.

As shown in FIG. 3, the motor 41 has a motor shaft 41a that can rotate around the central axis J2 extending in the front-rear direction X. The motor shaft 41a has a columnar shape centered on the central axis J2 and projects to the rear side. The rear end of the motor shaft 41a is connected to the transmission mechanism 42.

The transmission mechanism 42 is connected to the motor 41. More specifically, the transmission mechanism 42 is connected to the rear side of the motor 41. In the present embodiment, the transmission mechanism 42 is a deceleration mechanism that decelerates the rotation of the motor 41. The transmission mechanism 42 has a plurality of gears (not shown), a case 42a for accommodating the plurality of gears, and a flange portion 42b fixed to the case 42a.

A plurality of gears (not shown) of the transmission mechanism 42 connect the motor shaft 41a and the output shaft 43. As a result, the rotation of the motor shaft 41a is decelerated and transmitted to the output shaft 43. That is, the driving force of the motor 41 is transmitted to the output shaft 43 via the transmission mechanism 42. As shown in FIG. 4, the case 42a has a cylindrical shape centered on the central axis J2. The flange portion 42b is fixed to the front end portion of the case 42a. The flange portion 42b protrudes from the case 42a on both sides in the vertical direction Z.

As shown in FIG. 3, the output shaft 43 projects rearward from the transmission mechanism 42. The output shaft 43 is a columnar shape extending in the front-rear direction X about the central axis J3. The central axis J3 is parallel to the central axis J2 of the motor shaft 41a, and is arranged away from the central axis J2 on the other side in the width direction. The central axis J3 is arranged on the side opposite to the side on which the central axis J1 of the bolt 22 is arranged with respect to the central axis J2. That is, in the present embodiment, the output shaft 43 is eccentric with respect to the central axis J2 of the motor 41 in a direction away from the central axis J1 of the bolt 22 in the radial direction. The position of the central axis J3 in the vertical direction Z and the position of the central axis J2 in the vertical direction Z are, for example, the same. The output shaft 43 is inserted into the guide groove 23 via the opening 23a.

The gear mechanism portion 50 is housed inside the guide groove 23. More specifically, the gear mechanism portion 50 is housed inside the groove main body portion 23b. The gear mechanism unit 50 is connected to the drive unit 40. More specifically, the gear mechanism portion 50 is connected to a portion of the output shaft 43 inserted inside the guide groove 23. The gear mechanism unit 50 includes a drive gear, a driven gear 52, and a gear case 53. That is, the linear motion mechanism 10 includes a drive gear, a driven gear 52, and a gear case 53.

The drive gear 51 is a gear that is rotated by the drive unit 40. The drive gear 51 has a cylindrical shape centered on the central axis J3 of the output shaft 43. The drive gear 51 is fixed to the outer peripheral surface of the portion of the output shaft 43 inserted inside the groove main body 23b. As shown in FIG. 5, a Hassuba gear portion 51a is provided on the outer peripheral surface of the drive Hassuba gear 51. The twist angle of the Hasuba gear portion 51a is, for example, 45 °. The drive hub gear 51 is rotated around the central axis J3 by rotating the output shaft 43. That is, in the present embodiment, the rotation axis of the drive hassle gear 51 is the central axis J3 of the output shaft 43, and extends in a direction orthogonal to the vertical direction Z.

The driven gear 52 is a gear that meshes with the drive gear 51. The driven gear 52 is located on one side of the drive gear 51 in the width direction. The driven gear 52 is a nut having a female screw portion 52d on the inner peripheral surface that meshes with the male screw portion 22a of the bolt 22. The driven screw gear 52 is attached to the bolt 22 by engaging the female screw portion 52d with the male screw portion 22a. As a result, the gear mechanism 50 is connected to the bolt 22, and the self-propelled slider 30 is movably attached to the bolt 22 in the vertical direction Z.

In the present embodiment, the driven gear 52 has a cylindrical shape extending in the vertical direction Z about the central axis J1 of the bolt 22. In the present embodiment, the female screw portion 52d is provided on the entire inner peripheral surface of the driven Hasuba gear 52. The driven gear 52 has a main body portion 52a and a pair of supported portions 52b and 52c.

The main body 52a is the central portion of the driven gear 52 in the vertical direction Z. The main body 52a is located on one side in the width direction of the drive gear 51. The main body portion 52a is a portion having a Hasuba gear portion 52e on the outer peripheral surface. That is, the hasbar gear portion 52e is provided on the outer peripheral surface of the driven hasbar gear 52. The Hassuba gear portion 52e meshes with the Hassuba gear portion 51a of the drive Hassuba gear 51. The twist angle of the Hasuba gear portion 52e is, for example, 45 °. In the present embodiment, the Hasuba gear portion 52e is provided on the entire outer peripheral surface of the main body portion 52a.

The pair of supported portions 52b and 52c are provided on both sides of the main body portion 52a in the vertical direction Z, respectively. The supported portion 52b is a portion of the driven Hasuba gear 52 located above the main body portion 52a. The supported portion 52c is a portion of the driven hasba gear 52 located below the main body portion 52a. Gear portions are not provided on the outer peripheral surfaces of the supported portions 52b and 52c. The outer diameter of the supported portions 52b and 52c is smaller than the outer diameter of the main body portion 52a. The dimension of the supported portions 52b and 52c in the vertical direction Z is smaller than the dimension of the main body portion 52a in the vertical direction Z.

The dimension of the driven Hasuba gear 52 in the vertical direction Z is larger than the outer diameter of the driven Hasuba gear 52. In the present embodiment, the dimension of the driven Hassuba gear 52 in the vertical direction Z is the same as the dimension of the female screw portion 52d provided on the entire inner peripheral surface of the driven Hassuba gear 52 in the vertical direction Z. The outer diameter of the driven gear 52 includes the outer diameter of the main body 52a and the outer diameters of the supported portions 52b and 52c.

The dimension of the female screw portion 52d in the vertical direction Z is larger than, for example, the pitch circular radius of the Hasuba gear portion 52e provided in the main body portion 52a. Therefore, the dimension of the female screw portion 52d in the vertical direction Z can be increased, and the dimension of the portion where the bolt 22 and the driven gear 52 mesh with each other in the vertical direction Z can be increased. As a result, the number of tooth portions that mesh with each other in the male screw portion 22a of the bolt 22 and the female screw portion 52d of the driven gear 52 can be increased. Therefore, even if a force in the vertical direction Z is applied to the driven gear 52, the force can be dispersed and received by a relatively large number of teeth. Therefore, the load applied to the male screw portion 22a and the female screw portion 52d can be easily reduced, and damage to the male screw portion 22a and the female screw portion 52d can be suppressed.

The dimension of the female screw portion 52d in the vertical direction Z is larger than, for example, the pitch circle diameter of the Hasuba gear portion 52e. Therefore, the dimension of the female screw portion 52d in the vertical direction Z can be made larger, and the dimension of the portion where the bolt 22 and the driven gear 52 mesh with each other in the vertical direction Z can be made larger. Therefore, the load applied to the male screw portion 22a and the female screw portion 52d can be easily reduced, and damage to the male screw portion 22a and the female screw portion 52d can be further suppressed.

The dimension of the female screw portion 52d in the vertical direction Z is larger than, for example, the dimension of the Hasuba gear portion 52e in the vertical direction Z. The pitch circle diameter of the Hasuba gear portion 52e is, for example, twice or less the pitch circle diameter of the female screw portion 52d. Therefore, the pitch circle diameter of the Hasuba gear portion 52e can be made relatively small. As a result, the gear mechanism portion 50 can be easily miniaturized in the front-rear direction X.

The pitch circle diameter of the Hasuba gear portion 52e is, for example, the same as the pitch circle diameter of the Hasuba gear portion 51a of the drive Hasuba gear 51. The dimension of the Hasuba gear portion 52e in the vertical direction Z is larger than, for example, the pitch circle diameter of the Hasuba gear portion 52e.

The driven gear 52 is rotated around the central axis J1 of the bolt 22 by rotating the drive gear 51 around the central axis J3. That is, the rotating shaft of the driven gear 52 is the central shaft J1 of the bolt 22. Therefore, in the present embodiment, the rotating shaft of the driving hasba gear 51 and the rotating shaft of the driven hasba gear 52 are in twisted positions with each other. The rotating shaft of the driving hasba gear 51 and the rotating shaft of the driven hasba gear 52 are orthogonal to each other when viewed in the width direction Y. The driven gear 52 can move relative to the bolt 22 in the vertical direction Z by rotating relative to the bolt 22. Since the bolt 22 is fixed in the present embodiment, the driven gear 52 can move in the vertical direction Z with respect to the bolt 22 by rotating around the central axis J1.

As shown in FIG. 3, the gear case 53 rotatably accommodates the drive hasbar gear 51 and the driven hasver gear 52. As shown in FIG. 4, the gear case 53 includes a gear case main body 53a and fixing portions 54a and 54b. The gear case main body 53a has a substantially rectangular parallelepiped box shape in which the driving hasbar gear 51 and the driven hasbar gear 52 are housed. In the present embodiment, the gear case main body 53a is configured such that the upper case 53b and the lower case 53c are fixed in the vertical direction Z. The upper case 53b is located above the lower case 53c.

The gear case main body 53a has an output shaft insertion hole 53h that penetrates the front wall portion of the gear case main body 53a in the front-rear direction X. The output shaft insertion hole 53h is a circular hole centered on the central axis J3. The inner diameter of the output shaft insertion hole 53h is larger than the outer diameter of the output shaft 43. The output shaft 43 is inserted into the output shaft insertion hole 53h from the front side.

As shown in FIG. 6, the gear case main body 53a has a bearing holding hole 53d that penetrates the rear wall portion of the gear case main body 53a in the front-rear direction X. The bearing holding hole 53d is a circular hole centered on the central axis J3. The inner diameter of the bearing holding hole 53d is larger than the inner diameter of the output shaft insertion hole 53h. The bearing holding hole 53d holds a bearing portion 45 that rotatably supports the rear end portion of the output shaft 43. The bearing portion 45 is, for example, a cylindrical slide bearing centered on the central axis J3 and opened on both sides in the front-rear direction X. The rear end surface of the output shaft 43 is exposed to the outside of the gear case 53 via the bearing holding hole 53d.

As shown in FIG. 7, the gear case main body 53a includes a hole 53f that penetrates the upper wall portion of the gear case main body 53a in the vertical direction Z and a hole 53g that penetrates the lower wall portion of the gear case main body 53a in the vertical direction Z. Have. The holes 53f and 53g are circular holes centered on the central axis J1. The inner diameters of the holes 53f and 53g are larger than the outer diameter of the bolt 22. Bolts 22 are passed through the holes 53f and 53g in the vertical direction Z. The bolt 22 penetrates the gear case body 53a in the vertical direction Z through the holes 53f and 53g.

The gear case main body 53a has a through hole 53e that penetrates the rear wall portion of the gear case main body 53a in the front-rear direction X, and a through hole 53i that penetrates the front wall portion of the gear case main body 53a in the front-rear direction X. The through holes 53e and 53i face the main body 52a of the driven gear 52 in the front-rear direction X. The rear end of the Hasuba gear portion 52e is inserted into the through hole 53e. The front end of the Hasuba gear portion 52e is inserted into the through hole 53i. In this way, since a part of the Hasuba gear portion 52e is released by the through holes 53e and 53i, the dimension of the gear case main body 53a in the front-rear direction X can be reduced. Therefore, the gear mechanism portion 50 can be miniaturized in the front-rear direction X.

The rear end of the Hasuba gear portion 52e is exposed to the outside of the gear case 53 through the through hole 53e. The front end of the Hasuba gear portion 52e is exposed to the outside of the gear case 53 through the through hole 53i. As shown in FIG. 6, the through hole 53e is, for example, a rectangular hole long in the vertical direction Z. Although not shown, the through hole 53i is also a rectangular hole long in the vertical direction Z, like the through hole 53e.

As shown in FIG. 3, a gap is provided between the gear case main body 53a and the inner surface of the guide groove 23 in the present embodiment. The gear case body 53a is not in direct contact with the inner surface of the guide groove 23.

As shown in FIG. 7, bearing portions 56a and 56b are held inside the gear case main body 53a. That is, the linear motion mechanism 10 includes bearing portions 56a and 56b. The bearing portions 56a and 56b rotatably support the driven gear 52 around the central axis J1 of the bolt 22. In the present embodiment, the bearing portions 56a and 56b are cylindrical slide bearings centered on the central axis J1 and open on both sides in the vertical direction Z.

The bearing portion 56a is held in the upper case 53b of the gear case main body 53a. A supported portion 52b of the driven hasba gear 52 is fitted inside the bearing portion 56a. As a result, the supported portion 52b is rotatably supported by the bearing portion 56a. The bearing portion 56b is held in the lower case 53c of the gear case main body 53a. A supported portion 52c of the driven hasba gear 52 is fitted inside the bearing portion 56b. As a result, the supported portion 52c is rotatably supported by the bearing portion 56b.

Since the driven Hasuba gear 52 can be rotatably supported by the bearing portions 56a and 56b, the driven Hasuba gear 52 can be suitably rotated with respect to the bolt 22. Further, according to the present embodiment, the driven gear 52 has a pair of supported portions 52b and 52c on both sides of the main body portion 52a in the vertical direction Z, and the pair of supported portions 52b and 52c are a pair. It is rotatably supported by bearings 56a and 56b. Therefore, the driven gear 52 can be suitably rotated with respect to the bolt 22 in a more stable state.

As shown in FIG. 4, the fixing portions 54a and 54b project forward from the gear case main body 53a. The fixing portion 54a is provided at the upper end portion of the gear case main body 53a. The fixing portion 54b is provided at the lower end portion of the gear case main body 53a. The fixing portions 54a and 54b are provided on the portion of the gear case main body 53a that is closer to the other side in the width direction. The fixed portion 54a and the fixed portion 54b have the same configuration except that they are provided at different positions. Therefore, in the following description, only the fixed portion 54a may be described on behalf of the fixed portion 54a and the fixed portion 54b.

As shown in FIG. 8, the fixing portion 54a has a fixing portion main body 54c and a flange portion 54d. The fixed portion main body 54c is a portion that protrudes forward from the gear case main body 53a. The fixed portion main body 54c projects to the outside of the guide groove 23 via the opening 23a. The flange portion 54d is a portion that protrudes from the front end portion of the fixing portion main body 54c to both sides in the width direction Y. The dimension of the flange portion 54d in the width direction Y is larger than the dimension of the opening 23a in the width direction Y. The front surface of the flange portion 54d is in contact with the rear surface of the flange portion 42b of the transmission mechanism 42.

The fixing portion 54a has a female screw hole 54e that is recessed from the front end portion of the fixing portion 54a to the rear side. The rear end of the female screw hole 54e is located, for example, at the rear end of the fixing body 54c. A screw 57 that penetrates the flange portion 42b of the transmission mechanism 42 from the front side to the rear side is tightened in the female screw hole 54e. As a result, the fixing portion 54a and the transmission mechanism 42 are fixed by the screw 57. In this way, the fixing portion 54a is passed through the opening 23a and fixed to the driving portion 40 outside the guide groove 23. The fixing portion 54b is also fixed to the driving portion 40 in the same manner as the fixing portion 54a.

By fixing the fixing portions 54a and 54b to the drive portion 40, the drive portion 40 and the gear mechanism portion 50 are fixed. In the present embodiment, the drive unit 40 and the gear mechanism unit 50 can be fixed by a pair of fixing portions 54a and 54b provided at both ends of the gear case main body 53a in the vertical direction Z, so that the drive unit 40 and the gear mechanism unit 50 Can be fixed stably and firmly.

The fixed portion 54a is provided with a first sliding portion 55a. In the present embodiment, the first sliding portion 55a is a separate member from the fixing portion 54a. The first sliding portion 55a is attached to the fixing portion main body 54c. The first sliding portion 55a may be integrally molded with the fixing portion 54a. The first sliding portion 55a has a covering portion 55c, a rear flange portion 55d, and a front flange portion 55e.

The covering portion 55c is an angular U-shaped portion that opens downward when viewed in the front-rear direction X. As shown in FIG. 4, the covering portion 55c covers the fixing portion main body 54c from above. The covering portion 55c covers the upper side of the fixing portion main body 54c and both sides in the width direction Y. As shown in FIG. 8, the covering portion 55c is passed through the opening 23a. The dimension of the covering portion 55c in the width direction Y is smaller than the dimension of the opening 23a in the width direction Y. The surfaces of the covering portion 55c on both sides in the width direction face each of the edges of the opening 23a in the width direction with a slight gap.

One of the surfaces of the covering portion 55c on both sides in the width direction may be in contact with one of the edges of the opening 23a on both sides in the width direction due to the first sliding portion 55a being displaced in the width direction Y or the like. In this case, the covering portion 55c is slidable in the vertical direction Z with respect to one of the edges of the opening 23a on both sides in the width direction.

The rear flange portion 55d projects from the rear end of the covering portion 55c to both sides in the width direction Y. The rear flange portion 55d is located inside the guide groove 23. The portion of the rear flange portion 55d on one side in the width direction is located on the rear side of the first front wall portion 21a and is in contact with the first front wall portion 21a. The portion of the rear flange portion 55d on one side in the width direction is slidable in the vertical direction Z with respect to the first front wall portion 21a. The portion of the rear flange portion 55d on the other side in the width direction is located on the rear side of the second front wall portion 21b and is in contact with the second front wall portion 21b. The portion of the rear flange portion 55d on the other side in the width direction is slidable in the vertical direction Z with respect to the second front wall portion 21b.

In this way, the first sliding portion 55a can slide with the portions of the guide member 21 located on both sides of the opening 23a in the width direction via the rear flange portion 55d. By providing the first sliding portion 55a, the drive portion 40 and the gear mechanism portion 50 can be stably moved in the vertical direction Z with respect to the guide member 21. Depending on the state of the self-propelled slider 30, the rear flange portion 55d may not be in contact with at least one of the first front wall portion 21a and the second front wall portion 21b.

The front flange portion 55e protrudes from the front end portion of the covering portion 55c on both sides in the width direction Y. The front flange portion 55e is located outside the guide groove 23. The front surface of the front flange portion 55e faces the rear surface of the flange portion 54d via contact or a slight gap. A portion of the front flange portion 55e on one side in the width direction is arranged on the front side of the first front wall portion 21a so as to face each other with a gap. The portion of the front flange portion 55e on the other side in the width direction is arranged on the front side of the second front wall portion 21b so as to face each other with a gap.

The portion of the rear flange portion 55d on one side in the width direction and the portion of the front flange portion 55e on one side in the width direction sandwich the first front wall portion 21a in the front-rear direction X. The other side portion in the width direction of the rear flange portion 55d and the other side portion in the width direction of the front side flange portion 55e sandwich the second front wall portion 21b in the front-rear direction X. As described above, the first sliding portion 55a sandwiches each of the portions of the guide member 21 located on both sides of the opening 23a in the width direction in the opening direction of the opening 23a.

As shown in FIG. 9, a claw portion 55f projecting to the front side is provided at the lower end portion of the front side flange portion 55e. The claw portion 55f is hooked from the lower side to the lower end portion of the flange portion 54d. As a result, it is possible to prevent the first sliding portion 55a from being detached upward from the fixed portion 54a. The first sliding portion 55a is fixed to the fixing portion 54a by a snap fit by the claw portion 55f.

The fixed portion 54b is provided with a first sliding portion 55b. The first sliding portion 55b has the same configuration as the first sliding portion 55a provided in the fixed portion 54a, except that the first sliding portion 55b is arranged so as to be inverted in the vertical direction Z. In the present embodiment, the gear mechanism portion 50 is in contact with the guide member 21 only via the first sliding portions 55a and 55b. The drive unit 40 connected to the gear mechanism unit 50 is not in direct contact with the guide member 21.

When the drive Hasba gear 51 is rotated by the drive unit 40, the driven Hasuba gear 52 that meshes with the drive Hasba gear 51 rotates. As a result, the driven gear 52 moves in the vertical direction Z with respect to the bolt 22, and the drive unit 40 and the gear mechanism unit 50 move in the vertical direction Z with respect to the bolt 22.

Here, the drive unit 40 is fixed to the gear mechanism unit 50 connected to the bolt 22 via the fixing units 54a and 54b. Therefore, when the drive unit 40 is driven, the main body of the drive unit 40 is suppressed from rotating around the output shaft 43.

Further, when the driven gear 52 is to be rotated by the drive gear 51, a reaction force in a direction of rotating around the central axis J1 of the bolt 22 is applied to the drive unit 40 and the gear mechanism 50. On the other hand, according to the present embodiment, the fixing portions 54a and 54b are passed through the opening portion 23a. Therefore, when the drive unit 40 is driven, even if the drive unit 40 and the gear mechanism unit 50 try to rotate around the central axis J1 of the bolt 22, the fixing portions 54a and 54b are caught by the guide member 21. As a result, the drive unit 40 and the gear mechanism unit 50 are suppressed from rotating with respect to the central axis J1 of the bolt 22. Therefore, the driven gear 52 can be rotated to move the drive unit 40 and the gear mechanism unit 50 in the vertical direction Z preferably with respect to the bolt 22.

In the present embodiment, the rear flange portion 55d of the first sliding portion 55a is rearward to the first front wall portion 21a and the second front wall portion 21b at a position radially separated from the central axis J1 of the bolt 22. Are in contact with. Therefore, even if the drive unit 40 and the gear mechanism unit 50 try to rotate around the central axis J1 of the bolt 22, the rear flange portion 55d is pressed against the first front wall portion 21a or the second front wall portion 21b, and the drive unit 40 And the gear mechanism 50 can be prevented from rotating around the central axis J1 of the bolt 22.

Since the drive unit 40 and the gear mechanism unit 50 can be prevented from rotating around the central axis J1 of the bolt 22 in this way, the gear mechanism unit 50 rotates around the central axis J1 inside the guide groove 23 and the guide member 21 It is possible to suppress contact with. As a result, it is possible to prevent the gear mechanism portion 50 from rubbing against the inner surface of the guide groove 23, and it is possible to easily move the drive portion 40 and the gear mechanism portion 50 in the vertical direction Z.

Further, since the predetermined direction in which the self-propelled slider 30 moves in the present embodiment is the vertical direction Z, the weight of the drive unit 40 provided outside the guide groove 23 causes the gear mechanism unit 50 to move forward. A moment of falling direction is added. On the other hand, in the present embodiment, the rear flange portions 55d of the first sliding portions 55a and 55b come into contact with the first front wall portion 21a and the second front wall portion 21b from the rear side, whereby the gear mechanism portion 50 The moment applied to the guide member 21, that is, the weight of the drive unit 40 can be received by the guide member 21. As a result, it is possible to prevent the moment applied to the gear mechanism portion 50 from being applied to the bolt 22. Therefore, the load generated between the driven gear 52 and the bolt 22 that mesh with each other can be reduced, and the drive unit 40 and the gear mechanism unit 50 can be easily moved in the vertical direction Z.

Further, since the output shaft 43 for rotating the drive hasba gear 51 is arranged so as to be displaced in the width direction Y with respect to the central axis J1 of the bolt 22, the gear mechanism portion 50 has its own weight and drive of the gear mechanism portion 50. Depending on the weight of the portion 40, a moment in the direction of falling to the other side in the width direction is applied. On the other hand, according to the present embodiment, the output shaft 43 is eccentric with respect to the central axis J2 of the motor 41 in a direction away from the rotation axis of the driven hasba gear 52 in the radial direction. Therefore, as compared with the case where the output shaft 43 is not eccentric with respect to the central axis J2 of the motor 41, it is easier to arrange the entire drive unit 40 closer to the bolt 22 with which the driven gear 52 meshes.

In the present embodiment, as compared with the case where the central axis J3 is the central axis of the motor 41, the entire drive unit 40 can be positioned on one side in the width direction, and the center of gravity of the drive unit 40 is bolted in the width direction Y. It can be arranged close to the central axis J1 of 22. As a result, it is easy to reduce the distance in the width direction Y between the center of gravity of the drive unit 40 and the central axis J1 of the bolt 22, and the moment in the direction of tilting to the other side in the width direction applied to the gear mechanism unit 50 by the weight of the drive unit 40 is generated. Can be made smaller. Therefore, the load generated between the driven gear 52 and the bolt 22 that mesh with each other can be reduced, and the drive unit 40 and the gear mechanism unit 50 can be more easily moved in the vertical direction Z.

Further, according to the present embodiment, for example, when the first sliding portions 55a and 55b come into contact with the edge portion on the other side in the width direction of the opening 23a, the first sliding portion 55a and 55b are brought into contact with the other side in the width direction added to the gear mechanism portion 50. The guide member 21 can also receive a moment in the direction of falling. As a result, it is possible to suppress the moment applied to the gear mechanism portion 50 from being applied to the bolt 22, and it is possible to make it easier to move the drive portion 40 and the gear mechanism portion 50 in the vertical direction Z.

As shown in FIG. 2, the cover member 60 accommodates the drive unit 40 outside the guide groove 23. As shown in FIG. 1, the outer shape of the cover member 60 in the present embodiment is a rectangular parallelepiped shape flat in the width direction Y. The cover member 60 projects forward from the guide member 21. The cover member 60 is a portion that supports the object MO from below. As shown in FIG. 10, the cover member 60 includes a cover member main body 61, a second sliding portion 62, and a third sliding portion 63. That is, the linear motion mechanism 10 includes a cover member main body 61, a second sliding portion 62, and a third sliding portion 63.

The cover member main body 61 is a portion that accommodates the drive unit 40. The cover member main body 61 has a box-shaped accommodating portion 61a that opens on the other side in the width direction, and a lid portion 61b that closes the opening of the accommodating portion 61a. The accommodating portion 61a accommodates the driving unit 40 inside.

The cover member main body 61 has a through hole 67 that penetrates the wall portion on the rear side of the cover member main body 61 in the front-rear direction X. The through hole 67 is, for example, a rectangular hole long in the vertical direction Z. The through hole 67 is provided in a portion of the cover member main body 61 that is closer to the upper side than the center in the vertical direction Z. As shown in FIGS. 2 and 3, the drive unit 40 is passed through the through hole 67 in the front-rear direction X. The output shaft 43 projects to the outside of the cover member main body 61 through the through hole 67, and is inserted inside the guide groove 23.

As shown in FIG. 10, the second sliding portion 62 and the third sliding portion 63 project rearward from the cover member main body 61. The second sliding portion 62 and the third sliding portion 63 are arranged at intervals in the vertical direction Z. The second sliding portion 62 is provided in a portion of the wall portion on the rear side of the cover member main body 61 that is adjacent to the upper side of the through hole 67. The second sliding portion 62 is arranged at a position slightly lower than the upper end portion of the cover member main body 61. The third sliding portion 63 is provided at the lower end portion of the rear wall portion of the cover member main body 61. As shown in FIG. 2, the second sliding portion 62 and the third sliding portion 63 are passed through the opening 23a. The second sliding portion 62 and the third sliding portion 63 can slide in the vertical direction Z with respect to the guide member 21. In the present embodiment, the second sliding portion 62 and the third sliding portion 63 are a pair of sliding portions provided with the drive portion 40 sandwiched in the vertical direction Z.

As shown in FIGS. 11 to 13, the second sliding portion 62 has a base portion 64, a sliding portion main body 65, and a contact portion 66. As shown in FIG. 11, the base portion 64 is passed through the opening 23a. The base 64 has a first portion 64a, a second portion 64b, and a third portion 64c. The first portion 64a is a portion extending in the front-rear direction X and passed through the opening 23a. The second portion 64b is a portion protruding from the rear end portion of the first portion 64a on both sides in the width direction Y. The third portion 64c is a portion protruding from the front end portion of the first portion 64a on both sides in the width direction Y.

In the following description, the side close to the center of the first portion 64a in the width direction Y may be referred to as "inside in the width direction" with respect to a certain object, and from the center of the first portion 64a in the width direction Y. The distant side may be referred to as "outside in the width direction".

The portion on one side in the width direction of the second portion 64b and the portion on the one side in the width direction of the third portion 64c sandwich the first front wall portion 21a in the front-rear direction X. The second portion 64b on the other side in the width direction and the third portion 64c on the other side in the width direction sandwich the second front wall portion 21b in the front-rear direction X. As a result, the base portion 64 sandwiches each of the portions of the guide member 21 located on both sides of the opening 23a in the width direction in the opening direction of the opening 23a.

The base portion 64 is formed in a substantially H shape when viewed in the vertical direction Z by the first portion 64a, the second portion 64b, and the third portion 64c. As a result, as shown in FIG. 12, a pair of grooves 64e that are recessed inward in the width direction and extend in the vertical direction Z are provided on both sides of the base portion 64 in the width direction. A first front wall portion 21a and a second front wall portion 21b are inserted into each of the pair of grooves 64e.

As shown in FIG. 13, the base portion 64 has a hole portion 64d recessed inward in the width direction. In the present embodiment, the hole portion 64d is a hole having a bottom portion. As shown in FIG. 12, a pair of hole portions 64d are provided with the base portion 64 sandwiched in the width direction Y. In the present embodiment, the second sliding portion 62 has two pairs of holes 64d sandwiching the base portion 64 in the width direction Y at intervals in the vertical direction Z. That is, the second sliding portion 62 of the present embodiment is provided with a total of four hole portions 64d.

As shown in FIG. 13, the hole portion 64d is a circular hole when viewed in the width direction Y. The center of the hole portion 64d passes through the first portion 64a. The hole portion 64d is provided in the first portion 64a, and both end portions in the front-rear direction X are provided so as to straddle the second portion 64b and the third portion 64c, respectively.

As shown in FIG. 12, the sliding portion main body 65 is provided on both sides of the base portion 64 in the width direction Y, respectively. In the present embodiment, the second sliding portion 62 has two pairs of sliding portion main bodies 65 provided on both sides of the base portion 64 in the width direction Y at intervals in the vertical direction Z. That is, the second sliding portion 62 of the present embodiment is provided with a total of four sliding portion main bodies 65.

Each of the four sliding portion main bodies 65 is fitted into each of the four hole portions 64d provided in the base portion 64. That is, in the present embodiment, the pair of sliding portion main bodies 65 provided with the base portion 64 sandwiched in the width direction Y are separate members from each other, and the pair of hole portions 64d provided with the base portion 64 sandwiched in the width direction Y. It is fitted to each. The pair of sliding portion main bodies 65 provided on both sides of the base portion 64 are arranged symmetrically with each other in the width direction Y with the base portion 64 interposed therebetween.

As shown in FIGS. 12 and 13, the sliding portion main body 65 has a columnar shape centered on a central axis extending in the width direction Y. That is, the sliding portion main body 65 has a circular shape when viewed in the width direction Y. The sliding portion main body 65 is made of, for example, resin. The sliding portion main body 65 has a groove 65d that is recessed inward in the width direction. The groove 65d penetrates the sliding portion main body 65 in the vertical direction Z. By providing the groove 65d, the outer portion of the sliding portion main body 65 in the width direction is bifurcated in the front-rear direction X. As a result, the sliding portion main body 65 has the first protruding portion 65a and the second protruding portion 65b protruding outward in the width direction, the inner end portion in the width direction of the first protruding portion 65a, and the width direction of the second protruding portion 65b. It has a connecting portion 65c that connects the inner end portion.

The first protruding portion 65a and the second protruding portion 65b face each other in the front-rear direction X with a gap. The front surface of the first protrusion 65a and the rear surface of the second protrusion 65b are rectangular flat surfaces long in the vertical direction Z, and side surfaces of the groove 65d on both sides in the front-rear direction. The outer surface of the connecting portion 65c in the width direction is a substantially rectangular flat surface long in the vertical direction Z, and is the bottom surface of the groove 65d.

As shown in FIG. 12, the first protruding portion 65a is fitted into a portion of the hole portion 64d provided in the second portion 64b. The second protruding portion 65b is fitted into a portion of the hole portion 64d provided in the third portion 64c. The connecting portion 65c is fitted into a portion of the hole portion 64d provided in the first portion 64a.

The sliding portion main body 65 fitted in the hole portion 64d is rotatably provided around the rotation axis R extending in the width direction Y with respect to the base portion 64. The rotation shaft R passes through the center of the hole portion 64d and the sliding portion main body 65.

The inner surface of the groove 65d of the sliding portion main body 65 is provided so as to slightly protrude from the inner surface of the groove 64e of the base portion 64. More specifically, the bottom surface of the groove 65d of the sliding portion main body 65 projects slightly outward in the width direction from the bottom surface of the groove 64e of the base portion 64. In other words, the connecting portion 65c slightly protrudes outward in the width direction from the first portion 64a. The front-rear side side surfaces of the groove 65d of the sliding portion main body 65 project slightly in the front-rear direction X from the front-rear side side surfaces of the groove 64e of the base portion 64. In other words, the first protruding portion 65a protrudes slightly forward of the second portion 64b. The second protruding portion 65b protrudes slightly rearward from the third portion 64c.

As shown in FIG. 11, the sliding portion main body 65 is passed through the opening 23a. More specifically, the connecting portion 65c is passed through the opening 23a. The first protruding portion 65a projects outward in the width direction inside the guide groove 23. The second protruding portion 65b projects outward in the width direction outside the guide groove 23. Of the pair of sliding portion main bodies 65 that sandwich the base portion 64 in the width direction Y, the first protruding portion 65a and the second protruding portion 65b of the sliding portion main body 65 located on one side in the width direction are the first front wall portion 21a. Is sandwiched in the front-back direction X. Of the pair of sliding portion main bodies 65 that sandwich the base portion 64 in the width direction Y, the first protruding portion 65a and the second protruding portion 65b of the sliding portion main body 65 located on the other side in the width direction are the second front wall portion 21b. Is sandwiched in the front-back direction X. That is, each of the pair of sliding portion main bodies 65 has the first protruding portion 65a and the second protruding portion 65b, and each of the portions of the guide member 21 located on both sides of the opening 23a in the width direction of the opening 23a. It is sandwiched in the opening direction. The first front wall portion 21a and the second front wall portion 21b are inserted into the grooves 65d of the pair of sliding portion main bodies 65, respectively.

In the sliding portion main body 65 located on one side in the width direction of the pair of sliding portion main bodies 65 sandwiching the base portion 64 in the width direction Y, the front surface of the first protruding portion 65a is behind the first front wall portion 21a. It is slidable in contact with the side surface. In the sliding portion main body 65 located on the other side in the width direction of the pair of sliding portion main bodies 65 sandwiching the base portion 64 in the width direction Y, the front surface of the first protruding portion 65a is behind the second front wall portion 21b. It is slidable in contact with the side surface. That is, each of the first protruding portions 65a of the pair of sliding portion main bodies 65 is opened from the inside of the guide groove 23 with respect to each of the portions of the guide member 21 located on both sides of the opening 23a in the width direction. It is slidable in contact with the opening direction of 23a. The connecting portion 65c of the sliding portion main body 65, which is passed through the opening 23a, faces the inner edge portion in the width direction of the opening 23a through contact or a slight gap.

As described above, the pair of sliding portion main bodies 65 provided on both sides of the base portion 64 are located in the opening direction of the opening 23a with respect to each of the portions of the guide member 21 located on both sides in the width direction of the opening 23a. It can be touched and slid. In the present embodiment, the sliding portion main body 65 fitted into the hole portion 64d is provided so as to slightly project from the inner side surface of the groove 64e of the base portion 64. Therefore, the first front wall portion 21a and the second front wall portion 21b inserted into the groove 64e can come into contact with the sliding portion main body 65 while being suppressed from coming into contact with the base portion 64.

As shown in FIG. 6, the contact portion 66 projects from the lower end portion of the second portion 64b of the base portion 64 to one side in the width direction. The contact portion 66 is in contact with the gear case 53 from above inside the guide groove 23. In the present embodiment, the contact portion 66 is in contact with the peripheral edge portion of the hole 53f through which the bolt 22 is passed in the gear case 53. More specifically, the contact portion 66 is in contact with the peripheral portion of the hole 53f on the side where the cover member main body 61 is located in the front-rear direction X, that is, the front side portion. As a result, the cover member 60 is supported from below by the gear case 53 via the contact portion 66. The contact portion 66 is not fixed to the gear case 53. Therefore, the contact portion 66 can be separated from the gear case 53 in the vertical direction Z within a range in which the cover member 60 and the gear case 53 can move relative to each other in the vertical direction Z.

The third sliding portion 63 has the same configuration as the second sliding portion 62, except that the positions where the third sliding portion 63 is provided are different and the contact portion 66 is not provided. The cover member 60 is slidably attached to the guide member 21 in the vertical direction Z via the second sliding portion 62 and the third sliding portion 63.

In the present embodiment, the cover member 60 is not fixed to the drive unit 40 and the gear mechanism unit 50. The cover member 60 can move relative to the drive unit 40 and the gear mechanism unit 50 in the vertical direction Z within a range in which the drive unit 40 can move in the vertical direction Z in the through hole 67. The cover member 60 is lifted upward by the gear case 53 via the contact portion 66 by moving the drive portion 40 and the gear mechanism portion 50 upward. As a result, the cover member 60 moves upward together with the drive unit 40 and the gear mechanism unit 50.

On the other hand, when the drive unit 40 and the gear mechanism unit 50 move downward, the cover member 60 moves downward due to the weight of the cover member 60 and the weight of the object MO supported by the cover member 60. As a result, the cover member 60 moves downward together with the drive unit 40 and the gear mechanism unit 50.

Even if the cover member 60 does not move downward depending only on the weight of the cover member 60 and the weight of the object MO, the drive unit 40 moves downward and is located on the lower side of the through hole 67. By contacting the edge portion, the cover member 60 can be pushed downward by the drive unit 40. As a result, the drive unit 40 and the gear mechanism unit 50 can be moved downward, and the cover member 60 can be moved downward.

As described above, when the motor 41 rotates and the drive unit 40 and the gear mechanism unit 50 move in the vertical direction Z, the cover member 60 also moves in the vertical direction Z together with the drive unit 40 and the gear mechanism unit 50. .. In this way, the entire self-propelled slider 30 can move in the vertical direction Z with respect to the slide guide 20. As a result, the object MO can be moved in the vertical direction Z by the elevating device 1.

According to the present embodiment, since the self-propelled slider 30 moves in the vertical direction Z together with the drive unit 40, the vertical direction Z is not limited as long as the guide member 21 and the bolt 22 are within the arranged range. It is possible to move to. That is, the moving range of the self-propelled slider 30 can be easily changed by changing the lengths of the guide member 21 and the bolt 22. Therefore, the versatility of the self-propelled slider 30 can be improved.

Further, according to the present embodiment, the cover member 60 slides with respect to the guide member 21 via the second sliding portion 62 and the third sliding portion 63. Therefore, the cover member 60 can be stably moved in the vertical direction Z along the guide member 21. In particular, according to the present embodiment, the second sliding portion 62 and the third sliding portion 63 are a pair of sliding portions provided with the drive portion 40 sandwiched in the vertical direction Z. Therefore, the vertical direction Z between the second sliding portion 62 and the third sliding portion 63 can be preferably spaced. As a result, the cover member 60 can be moved more stably in the vertical direction Z along the guide member 21. Therefore, the self-propelled slider 30 can be easily moved in the vertical direction Z.

Further, since the cover member 60 supports the object MO, a relatively large downward force is likely to be applied to the cover member 60. On the other hand, according to the present embodiment, the second sliding portion 62 has a contact portion 66 that contacts the gear case 53 from above, and the cover member 60 is lowered by the gear case 53 via the contact portion 66. It is supported from the side. Therefore, the downward force applied to the cover member 60 can be received by the gear case 53 inside the guide groove 23. As a result, the moment applied to the gear mechanism 50 can be reduced as compared with the case where the downward force applied to the cover member 60 is received by the gear mechanism 50 or the drive 40 outside the guide groove 23. Therefore, the load generated between the driven gear 52 and the bolt 22 that mesh with each other can be further reduced, and the self-propelled slider 30 can be more easily moved in the vertical direction Z.

Further, according to the present embodiment, the contact portion 66 is in contact with the peripheral edge portion of the hole 53f through which the bolt 22 is passed in the gear case 53. Therefore, the gear case 53 can receive the force from the cover member 60 at a position close to the central axis J1 of the bolt 22. As a result, the moment applied to the gear mechanism 50 due to the force received from the cover member 60 can be made smaller. Therefore, the load generated between the driven gear 52 and the bolt 22 that mesh with each other can be further reduced, and the self-propelled slider 30 can be more easily moved in the vertical direction Z.

Further, according to the present embodiment, the contact portion 66 is in contact with the portion of the peripheral edge portion of the hole 53f on the side where the cover member main body 61 is located in the front-rear direction X. Therefore, the moment applied to the gear mechanism portion 50 due to the force received from the cover member 60 can be set as the moment in the direction of tilting forward. As described above, the moment applied to the gear mechanism portion 50 in the direction of tilting forward can be received by the guide member 21 via the first sliding portions 55a and 55b. As a result, the weight of the cover member 60 and the weight of the object MO can be received by the guide member 21 via the gear mechanism portion 50. Therefore, the load generated between the driven gear 52 and the bolt 22 that mesh with each other can be further reduced, and the self-propelled slider 30 can be more easily moved in the vertical direction Z.

Further, since the contact portion 66 is located on the front side of the bolt 22, even if the cover member 60 tries to move to the rear side with respect to the guide member 21, the contact portion 66 is caught on the bolt 22 from the front side. As a result, it is possible to prevent the cover member 60 from moving to the rear side with respect to the guide member 21.

Further, since the cover member 60 supports the object MO, a relatively large moment in the direction of tilting forward is likely to be applied to the cover member 60. On the other hand, in the present embodiment, each of the first protruding portions 65a of the pair of sliding portion main bodies 65 guides the guide members 21 with respect to the portions located on both sides of the opening 23a in the width direction. It is slidable in contact with the front-rear direction X from the inside of the groove 23. Therefore, when the first protruding portion 65a comes into contact with the first front wall portion 21a and the second front wall portion 21b from the rear side, the guide member 21 receives a moment applied to the cover member 60 in the direction of tilting to the front side. Can be done. As a result, the weight of the cover member 60 and the weight of the object MO can be received by the guide member 21 via the cover member 60. Therefore, the force applied from the cover member 60 to the gear mechanism portion 50 via the contact portion 66 can be reduced. Therefore, the load generated between the driven gear 52 and the bolt 22 that mesh with each other can be further reduced, and the self-propelled slider 30 can be more easily moved in the vertical direction Z.

Further, according to the present embodiment, each of the pair of sliding portion main bodies 65 provided on both sides of the base portion 64 in the width direction Y is formed by the first protruding portion 65a and the second protruding portion 65b of the guide member 21. Each of the portions of the opening 23a located on both sides in the width direction is sandwiched in the front-rear direction X. Therefore, for example, even when the cover member 60 is largely moved to the rear side with respect to the guide member 21, the second protruding portion 65b is brought into contact with the first front wall portion 21a and the second front wall portion 21b to be vertical. It can be slid in the direction Z. As a result, the cover member 60 can be moved more stably in the vertical direction Z. In the present embodiment, since the contact portion 66 is caught by the bolt 22 as described above, the contact of the second protruding portion 65b with the first front wall portion 21a and the second front wall portion 21b is suppressed.

Further, according to the present embodiment, the base portion 64 sandwiches each of the portions of the guide member 21 located on both sides of the opening 23a in the width direction in the front-rear direction X. Therefore, the sliding portion main body 65 having the first protruding portion 65a and the second protruding portion 65b that sandwich the portions of the guide member 21 located on both sides in the width direction of the opening 23a can be easily held by the base portion 64.

Further, according to the present embodiment, since the cover member 60 is not fixed to the gear mechanism portion 50 and the drive portion 40, when an unintended external force is applied to the cover member 60, the cover member 60 is applied to the cover member 60. The external force is not easily transmitted to the gear mechanism 50 and the drive 40. As a result, it is possible to prevent an unintended load from being generated between the driven gear 52 and the bolt 22, and between the drive gear 51 and the driven gear 52. Therefore, the movement of the self-propelled slider 30 in the vertical direction Z can be suitably maintained, and damage to the self-propelled slider 30 can be suppressed.

The unintended external force applied to the cover member 60 is, for example, a force for lifting the cover member 60 upward. In this case, the cover member 60 moves upward with respect to the gear mechanism 50 and the drive 40 within the range in which the drive 40 can move in the through hole 67. Therefore, it is possible to suppress the upward force applied to the cover member 60 from being applied to the gear mechanism portion 50 and the drive portion 40.

Further, according to the present embodiment, since the cover member 60 is not fixed to the gear mechanism unit 50 and the drive unit 40, it is easy to change only the cover member 60 while leaving the gear mechanism unit 50 and the drive unit 40 as they are. Is. As a result, it is easy to change the shape of the cover member 60 or the like according to the shape or the like of the object MO to be moved.

Further, for example, the cover member 60 may be tilted in the front-rear direction X with respect to the guide member 21. In particular, since the cover member 60 as in the present embodiment supports the object MO, a moment in the direction of tilting forward is likely to be applied to the cover member 60, and the cover member 60 tilts in the front-rear direction X with respect to the guide member 21. Cheap. Further, when the cover member 60 moves in the vertical direction Z, for example, the flatness of the first front wall portion 21a and the flatness of the second front wall portion 21b of the guide member 21 differ depending on the position in the vertical direction Z. , The inclination of the cover member 60 in the front-rear direction X with respect to the guide member 21 may change. In such a case, the contact area between the cover member 60 and the guide member 21 becomes small, such as when the cover member 60 and the guide member 21 come into point contact with each other, and the guide member 21 and the cover member 60 may be easily damaged by rubbing. there were. Therefore, the self-propelled slider 30 and the linear motion mechanism 10 may be easily damaged.

On the other hand, according to the present embodiment, the pair of sliding portion main bodies 65 provided on the second sliding portion 62 and the third sliding portion 63 respectively extend in the width direction Y with respect to the base portion 64. It is provided so as to be rotatable around the rotation shaft R. Therefore, even if the cover member 60 is tilted in the front-rear direction X with respect to the guide member 21, the sliding portion main body 65 rotates relative to the base portion 64 around the rotation axis R. As a result, when the cover member 60 moves in the vertical direction Z, it is possible to maintain a state in which the guide member 21 and the cover member 60 are in good surface contact with each other. Therefore, regardless of the inclination of the cover member 60 with respect to the guide member 21, the cover member 60 can be slid with respect to the guide member 21 in a state where the guide member 21 and the cover member 60 are in suitable contact with each other. Therefore, it is possible to prevent the guide member 21 and the cover member 60 from being rubbed and damaged. As a result, it is possible to prevent the self-propelled slider 30 and the linear motion mechanism 10 from being rubbed and damaged.

Specifically, in the present embodiment, when the cover member 60 is tilted in the front-rear direction X, the first protruding portion 65a is pushed by the first front wall portion 21a and the second front wall portion 21b, and the sliding portion main body 65 is rotated. It rotates around the drive axis R. As a result, it is possible to suitably maintain a state in which the first protruding portion 65a of the pair of sliding portion main bodies 65 is in surface contact with the first front wall portion 21a and the second front wall portion 21b, respectively. Therefore, it is possible to prevent the surfaces of the first protruding portion 65a that come into contact with the first front wall portion 21a and the second front wall portion 21b from being rubbed and damaged.

Further, according to the present embodiment, it is also possible to replace only the sliding portion main body 65 with respect to the second sliding portion 62 and the third sliding portion 63. Therefore, even if the sliding portion main body 65 is rubbed and damaged, the damage of the linear motion mechanism 10 can be easily repaired by replacing only the sliding portion main body 65.

Further, according to the present embodiment, the sliding portion main body 65 is fitted into the hole portion 64d provided in the base portion 64, and the sliding portion main body 65 and the hole portion 64d have a circular shape when viewed in the width direction Y. .. Therefore, it is easy to rotatably hold the sliding portion main body 65 with respect to the base portion 64. Further, the shape of the sliding portion main body 65 and the hole portion 64d can be made relatively simple, and the sliding portion main body 65 and the hole portion 64d can be easily formed.

Further, according to the present embodiment, the hole portions 64d are holes having a bottom portion, and are provided in pairs with the base portion 64 sandwiched in the width direction Y. Further, the pair of sliding portion main bodies 65 are separate members from each other, and are fitted into the pair of hole portions 64d, respectively. Therefore, the pair of sliding portion main bodies 65 can be independently rotated with respect to the base portion 64. Further, unlike the case where the pair of sliding portion main bodies 65 are collectively fitted into the holes penetrating the base portion 64, the pair of sliding portion main bodies 65 do not come into contact with each other, so that the rotation of each sliding portion main body 65 is prevented. It is not hindered by the other sliding portion body 65. As a result, each sliding portion main body 65 can be preferably rotated independently. Therefore, the sliding portion main body 65 can be suitably rotated in accordance with the first front wall portion 21a and the second front wall portion 21b, and the sliding of the cover member 60 and the guide member 21 is more preferable. Can be maintained.

Further, according to the present embodiment, the second sliding portion 62 and the third sliding portion 63 have a plurality of pairs of a pair of sliding portion main bodies 65. Therefore, the second sliding portion 62 and the third sliding portion 63 can be slid more stably with respect to the guide member 21.

Further, according to the present embodiment, the self-propelled slider 30 can be moved in the vertical direction Z by rotating the driven gear 52, which is a nut attached to the bolt 22 extending in the vertical direction Z. Therefore, even if a force in the vertical direction Z is applied to the self-propelled slider 30 by the object MO or the like, the driven gear 52 is suppressed from rotating with respect to the bolt 22. As a result, it is possible to prevent the self-propelled slider 30 from unintentionally moving in the vertical direction Z even when the drive of the drive unit 40 is stopped. Therefore, the position of the self-propelled slider 30 in the vertical direction Z can be suitably maintained without separately providing a mechanism for fixing the self-propelled slider 30 to the slide guide 20. Therefore, the self-propelled slider 30 can be miniaturized, and the linear motion mechanism 10 can be miniaturized.

Further, according to the present embodiment, the nut attached to the bolt 22 is a driven gear 52 having a gear portion 52e. Compared to spur gears, toothbar gears can have a longer meshing length between teeth and can disperse tooth contact. Therefore, the Hasuba gear can smoothly mesh the gears with each other as compared with the spur gear, and can increase the quietness, durability, and rotation transmission accuracy. That is, in the present embodiment, the meshing between the drive gear and the driven gear 52 can be smoothed. Therefore, the noise generated by the meshing of the drive gear 51 and the driven gear 52 can be reduced, and the durability of each gear can be improved. Further, the rotation can be suitably transmitted from the drive gear 51 to the driven gear 52. Therefore, the quietness and reliability of the linear motion mechanism 10 can be improved. Further, the self-propelled slider 30 can be moved more preferably in the vertical direction Z with respect to the slide guide 20.

Further, for example, when the rotating shaft of the driving hasba gear is arranged parallel to the rotating shaft of the driven hasba gear, the driving unit for rotating the driving hasba gear is arranged parallel to the bolt, and the self-propelled slider is arranged in the vertical direction. It is easy to increase the size to Z. Further, the drive unit easily interferes with the bolt, and the self-propelled slider tends to be enlarged in order to avoid the interference. Further, since the drive unit easily interferes with the opening of the guide groove, it is necessary to widen the width of the opening of the guide groove, and there is a possibility that a problem such as foreign matter easily entering the inside of the guide member may occur.

On the other hand, according to the present embodiment, by using the driven hasba gear 52, the direction in which the rotating shaft of the driven hasba gear 51 extends can be made different from the direction in which the rotating shaft of the driven hasba gear 52 extends. Specifically, in the present embodiment, the rotating shaft of the driving hasba gear 51 and the rotating shaft of the driven hasba gear 52 are in twisted positions. Therefore, the drive unit 40 for rotating the drive hub gear 51 can be arranged along the direction away from the bolt 22 in the radial direction. As a result, the self-propelled slider 30 can be miniaturized in the vertical direction Z.

Further, it is possible to prevent the drive unit 40 from interfering with the bolt 22 extending in the vertical direction Z. Therefore, it is possible to prevent the self-propelled slider 30 from becoming large in size in order to avoid interference between the drive unit 40 and the bolt 22, and the self-propelled slider 30 can be miniaturized. More specifically, for example, it is not necessary to increase the number of gears in the gear mechanism unit 50 in order to avoid interference between the drive unit 40 and the bolt 22. In addition, as described above, it is not necessary to separately provide a mechanism for fixing the position of the self-propelled slider 30 in the vertical direction Z. Therefore, the number of parts of the gear mechanism portion 50 can be reduced, and the entire gear mechanism portion 50 can be miniaturized. As a result, the gear mechanism portion 50 can be easily accommodated inside the guide groove 23.

Specifically, in the present embodiment, the gear mechanism unit 50 has only two gears, the drive gear 51 and the driven gear 52. Therefore, the gear case 53 accommodating each gear of the gear mechanism portion 50 can be miniaturized. Therefore, the entire gear mechanism portion 50 can be miniaturized, and the gear mechanism portion 50 can be easily accommodated inside the guide groove 23.

In this way, since the self-propelled slider 30 can be miniaturized, the weight of the self-propelled slider 30 can be reduced. Therefore, the energy of the drive unit 40 required to move the self-propelled slider 30 in the vertical direction Z can be reduced. As a result, the energy ratio of the drive unit 40 that can be used to move the object MO can be increased. Therefore, it is possible to move a relatively large object MO by the self-propelled slider 30 while using the small motor 41.

Further, since the drive unit 40 can be arranged along the direction away from the bolt 22 in the radial direction, it is possible to prevent the drive unit 40 from interfering with the opening 23 a of the guide groove 23. As a result, the width of the opening 23a can be easily narrowed, and foreign matter or the like can be prevented from entering the inside of the guide groove 23 from the opening 23a. Specifically, in a state where the drive unit 40 is arranged outside the guide groove 23 and the gear mechanism unit 50 is arranged inside the guide groove 23, the output shaft 43 is inserted into the guide groove 23 to insert the gear mechanism unit 50. The drive wheel gear 51 can be rotated. Therefore, the width of the opening 23a may be large enough to allow the output shaft 43 to be inserted. As a result, the width of the opening 23a can be sufficiently reduced, and foreign matter or the like can be prevented from entering the inside of the guide groove 23 from the opening 23a.

In the present embodiment, the width of the opening 23a is smaller than the outer diameter of the driven gear 52. Therefore, the opening 23a can be made relatively small. As a result, it is possible to prevent foreign matter or the like from entering the inside of the guide groove 23 from the opening 23a.

Further, according to the present embodiment, the rotation axis of the drive wheel gear 51 extends in a direction orthogonal to the vertical direction Z. Therefore, the drive unit 40 can be arranged along the front-rear direction X orthogonal to the vertical direction Z in which the bolt 22 extends. Therefore, the self-propelled slider 30 can be miniaturized in the vertical direction Z. Further, since the drive wheel gear 51 fixed to the output shaft 43 can be in a posture that does not tilt in the front-rear direction X, the gear mechanism portion 50 can be easily miniaturized in the front-rear direction X. As a result, the gear mechanism portion 50 can be more easily accommodated inside the guide groove 23. In the present embodiment, since the twist angle of the hassle gear portion 52e of the driven hassle gear 52 is 45 °, the drive hasss gear 51 and the driven hasss gear 52 can be meshed at a right angle. As a result, the rotation axis of the drive hasba gear 51 can be arranged along the direction orthogonal to the vertical direction Z in which the rotation axis of the driven hasba gear 52 extends.

The present invention is not limited to the above-described embodiment, and other configurations may be adopted within the scope of the technical idea of the present invention. As long as the rotating shaft of the driving hasba gear and the rotating shaft of the driven hasba gear are in twisted positions with each other, the rotating shaft of the driving hasba gear may extend in any direction. The rotation axis of the drive hassle gear may extend in a predetermined direction, that is, in a direction inclined with respect to the vertical direction Z in the above-described embodiment. The twist angle of the drive gear and the twist angle of the driven gear are not particularly limited.

The pitch circle diameter of the Hasuba gear portion of the drive Hasuba gear and the pitch circle diameter of the Hasuba gear portion of the driven Hasuba gear are not particularly limited. The pitch circle diameter of the hasba gear portion of the driven hasba gear may be larger than twice the pitch circle diameter of the female screw portion provided on the inner peripheral surface of the driven hasba gear. In this case, the thickness of the driven gear can be increased, and the strength of the driven gear can be improved. The Hasuba gear portion of the driving Hasuba gear and the Hasuba gear portion of the driven Hasuba gear may be negatively dislocated. In this case, since the meshing ratio between the gears can be improved, quietness and durability can be further improved. The Hasuba gear portion of the drive Hasuba gear and the Hasuba gear portion of the driven Hasuba gear may or may not be displaced positively.

The size of the female screw portion provided on the inner peripheral surface of the driven gear is not particularly limited in a predetermined direction. The inner diameter of the female screw portion may have a shape that expands in the radial direction at the central portion in a predetermined direction. In this case, even if the driven gear is deformed by receiving a strong force in the radial direction from the outside, it is possible to prevent the female screw portion from being strongly pressed against the bolt, and the mesh between the female screw portion and the bolt is preferably engaged. Can be maintained.

The material of the drive gear and the material of the driven gear are not particularly limited, and may be metal or resin. When the material of the driven gear and the material of the driven gear are made of resin, it is easy to increase the contact area between the teeth of the gears, and the life of each gear can be improved.

The configuration of the transmission mechanism is not particularly limited as long as it can transmit the driving force of the motor to the output shaft. The transmission mechanism may be a mechanism that accelerates the rotation of the motor shaft and transmits it to the output shaft, or may be a mechanism that transmits the rotation of the motor shaft to the output shaft without decelerating or accelerating. The output shaft of the drive unit does not have to be eccentric with respect to the central axis of the motor.

The cover member may be fixed to at least one of the gear mechanism portion and the drive portion. The sliding portion of the cover member may have only one pair of sliding portion main bodies. The hole into which the sliding portion body is fitted may penetrate the base portion. The pair of sliding portion main bodies may be integrally molded. The sliding portion main body may be provided on a member other than the cover member. The sliding portion main body may be provided on at least one of the gear mechanism portion and the driving portion, for example. The sliding portion body does not have to be rotatable with respect to the base. The cover member may have only one sliding portion. For example, in the above-described embodiment, the cover member 60 does not have to have the third sliding portion 63. The cover member may not be provided.

The guide member does not have to be a rail as long as it has a guide groove. For example, the guide member may be a wall-shaped member having a guide groove. The width of the opening of the guide groove is not particularly limited. The width of the opening of the guide groove may be larger than the outer diameter of the drive gear.

The linear motion mechanism may have a configuration in which a plurality of self-propelled sliders are attached to the bolts, as in the linear motion mechanism 110 shown in FIG. According to this configuration, a plurality of object MOs can be moved in a predetermined direction. In FIG. 14, the guide member 21 and the cover member 60 are not shown.

In the linear motion mechanism 110 shown in FIG. 14, three self-propelled sliders 30 are attached to the bolt 22. In FIG. 14, the elevating device 2 is configured by two linear motion mechanisms 110 arranged at intervals in the width direction Y. In the elevating device 2, three pairs of self-propelled sliders 30 arranged at intervals in the width direction Y are provided at intervals in the vertical direction Z. Therefore, it is possible to move the three object MOs in the vertical direction Z by the three pairs of self-propelled sliders 30.

When a plurality of self-propelled sliders are attached to one bolt, the plurality of self-propelled sliders may include self-propelled sliders attached in different directions. For example, in the linear motion mechanism 110 shown in FIG. 14, one or two self-propelled sliders 30 have a drive unit 40 in the width direction Y, as in the self-propelled slider 30 shown by the alternate long and short dash line in FIG. It may be attached to the bolt 22 in an orientation arranged along. In this case, the guide member 21 (not shown) in FIG. 14 is provided with an opening that opens in the width direction Y, in addition to the opening 23a of the above-described embodiment.

In the above-described embodiment, the driven mechanism is a linear motion mechanism in which the driven gear is moved in a predetermined direction with respect to the bolt, but the present invention is not limited to this. The linear motion mechanism may be configured such that the bolt moves in a predetermined direction with respect to the driven gear. The use of the linear motion mechanism is not particularly limited. It should be noted that the configurations described in the present specification can be appropriately combined within a range that does not contradict each other.

10, 110 ... Linear mechanism, 21 ... Guide member, 22 ... Bolt, 22a ... Male screw part, 23 ... Guide groove, 23a ... Opening, 30 ... Self-propelled slider, 40 ... Drive unit, 41 ... Motor, 42 ... Transmission mechanism, 43 ... Output shaft, 50 ... Gear mechanism, 51 ... Driven gear, 52 ... Driven gear, 52d ... Female screw, 52e ... Hasba gear, 53 ... Gear case, 53f ... Hole, 54a, 54b ... Fixed portion, 55a, 55b ... First sliding portion, 60 ... Cover member, 61 ... Cover member main body, 62 ... Second sliding portion, 66 ... Contact portion, X ... Front-back direction (opening direction), Y ... Width Direction, Z ... Vertical direction (predetermined direction)

Claims (14)

A self-propelled slider that can move in the predetermined direction with respect to a bolt extending in the predetermined direction.
A drive unit with a motor and
A drive gear that is rotated by the drive unit, and a gear mechanism unit that has a driven gear that meshes with the drive gear.
With
The driven gear is a nut having a female threaded portion on the inner peripheral surface that meshes with the male threaded portion of the bolt.
A self-propelled slider in which the rotating shaft of the driving hasba gear and the rotating shaft of the driven hasba gear are twisted to each other. The self-propelled slider according to claim 1, wherein the rotation axis of the drive hassle gear extends in a direction orthogonal to the predetermined direction. The bolt is fixed to a guide member having a guide groove extending in the predetermined direction, and is housed inside the guide groove.
The guide groove has a narrow width at the opening.
The gear mechanism portion is housed inside the guide groove and is housed in the guide groove.
The drive unit is provided outside the guide groove.
The self-propelled slider according to claim 1 or 2, wherein the output shaft of the drive unit is inserted into the guide groove through the opening. The gear mechanism portion has a gear case that rotatably accommodates the driven gear and the driven gear.
The gear case has a fixing portion that is passed through the opening and fixed to the driving portion outside the guide groove.
The self-propelled slider according to claim 3, wherein the fixed portion is provided with a first sliding portion that is slidable with portions of the guide member located on both sides in the width direction of the opening. A cover member for accommodating the drive unit is further provided outside the guide groove.
The predetermined direction is the vertical direction.
The cover member is
The cover member body that houses the drive unit and
A second sliding portion that protrudes from the cover member main body, is passed through the opening, and is slidable with respect to the guide member.
Have,
The second sliding portion has a contact portion that comes into contact with the gear case from above in the vertical direction inside the guide groove.
The self-propelled slider according to claim 4, wherein the cover member is supported from the lower side in the vertical direction by the gear case via the contact portion. The self-propelled slider according to claim 5, wherein the contact portion is in contact with the peripheral edge portion of the hole through which the bolt is passed in the gear case. The self-propelled slider according to claim 6, wherein the contact portion is in contact with a portion of the peripheral edge portion on the side where the cover member main body is located in the opening direction of the opening. The drive unit has a transmission mechanism connected to the motor.
The driving force of the motor is transmitted to the output shaft of the driving unit via the transmission mechanism.
The self-propelled slider according to any one of claims 1 to 7, wherein the output shaft is eccentric with respect to the central axis of the motor in a direction away from the rotation axis of the driven gear. The self-propelled slider according to any one of claims 1 to 8, wherein the dimension of the female screw portion in the predetermined direction is larger than the pitch circle diameter of the hasva gear portion of the driven gear. Bolts that extend in a predetermined direction
The self-propelled slider according to any one of claims 1 to 9, which is movably attached to the bolt in the predetermined direction.
A linear motion mechanism. The linear motion mechanism according to claim 10, wherein a plurality of the self-propelled sliders are attached to the bolts. A drive unit with a motor and
A drive gear that is rotated by the drive unit, and a gear mechanism unit that has a driven gear that meshes with the drive gear.
A bolt to which the gear mechanism is connected and extends in a predetermined direction,
With
The driven gear is a nut having a female threaded portion on the inner peripheral surface that meshes with the male threaded portion of the bolt.
A linear motion mechanism in which the rotating shaft of the driving hasba gear and the rotating shaft of the driven hasba gear are in twisted positions with each other. The linear motion mechanism according to claim 12, wherein the bolt is fixed to a guide member having a guide groove extending in a predetermined direction and is housed inside the guide groove. The guide groove has a narrow width at the opening.
The maximum width of the guide groove is larger than the outer diameter of the driven gear.
The linear motion mechanism according to claim 13, wherein the width of the opening is smaller than the outer diameter of the driven gear.

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