Straight and curved guide device

Abstract

To provide a straight line / curved line guide device enabling suppression of degradation of the guiding accuracy thereof.SOLUTION: The straight line / curved line guide device comprises a rail, and a movable element. The movable element includes a frame, a first swing portion, and a second swing portion. The first swing portion and the second swing portion are constituted in such a manner that they can turn around a connection portion where the first and the second swing portions are connected to the frame. Each of the first swing portion and the second swing portion includes an arm portion, a first bearing portion, and a second bearing portion. The first bearing portion includes a first raceway member, a second raceway member, and a plurality of first rolling elements. The second bearing portion includes a third raceway member, a fourth raceway member, and a plurality of second rolling elements. The straight line / curved line guide device further comprises an elastic member arranged straddling between the arm portions of the first swing portion and the second swing portion and set in a compressed state of being compressed in the longitudinal direction of the rail or in a strained state of being strained in the longitudinal direction of the rail.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present disclosure relates to a straight guide device. [Background technology]

[0002] BACKGROUND ART Straight and curved guide devices in which a mover moves on a rail including a straight portion and a curved portion have been known. This type of technology is disclosed in Patent Document 1, for example.

[0003] The mover of the straight / curve guide device disclosed in Patent Document 1 includes a pair of rollers spaced apart in the width direction of the rail. A rail groove is formed on the outer circumferential surface of the roller. The mover moves longitudinally on the rail with its end in the width direction of the rail in contact with the rail groove. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 6-39672 Summary of the Invention [Problem to be solved by the invention]

[0005] In the straight and curved guideway device disclosed in Patent Document 1, the gap between the roller and the rail may widen during movement of the mover due to differences in the accuracy of the rail width dimension. For this reason, conventional straight and curved guideway devices have a problem in that the guiding accuracy decreases as the gap between the roller and the rail widens.

[0006] An object of the present disclosure is to provide a straight / curve guide device that can suppress a decrease in guiding accuracy. [Means for solving the problem]

[0007] A straight / curve guide device according to the present disclosure includes a rail including a straight portion and a curved portion, and a mover movable on the rail. The mover includes a frame, a first swing section connected to the frame and in contact with the rail, and a second swing section connected to the frame and spaced from the first swing section in the longitudinal direction of the rail and in contact with the rail. The first swing section and the second swing section are configured to be rotatable about a connection section with the frame within a plane including the longitudinal direction and width direction of the rail. Each of the first swing section and the second swing section includes an arm section extending in the width direction of the rail, a first bearing section located on one side of the longitudinal center of the arm section, and a second bearing section located on the other side of the longitudinal center of the arm section. The first bearing portion includes a first race member fixed to the arm portion and penetrating the arm portion in the rail height direction, the first race member having an annular first raceway surface on its outer circumferential surface, a second race member having an annular second raceway surface opposite the first raceway surface on its inner circumferential surface and a first annular rail groove on its outer circumferential surface that contacts the rail, and a plurality of first rolling elements arranged in a first annular rolling path defined by the first and second raceway surfaces.The second bearing portion includes a third race member fixed to the arm portion and penetrating the arm portion in the rail height direction, the fourth race member having an annular fourth raceway surface opposite the third raceway surface on its inner circumferential surface and a second annular rail groove on its outer circumferential surface that contacts the rail, and a plurality of second rolling elements arranged in a second annular rolling path defined by the third and fourth raceway surfaces. The straight / curve guide device further includes an elastic member that is arranged to straddle the arm portion of the first swing portion and the arm portion of the second swing portion, and that is in a compressed state in which it is compressed in the longitudinal direction of the rail, or in a tensile state in which it is pulled in the longitudinal direction of the rail. [Effects of the Invention]

[0008] According to the present disclosure, it is possible to provide a straight / curve guide device that can suppress a decrease in guiding accuracy. [Brief explanation of the drawings]

[0009] [Figure 1]FIG. 1 is a perspective view showing the configuration of a straight / curve guide device according to the first embodiment. [Figure 2] FIG. 2 is a front view showing the configuration of the mover of the straight-curve guiding device according to the first embodiment. [Figure 3] FIG. 3 is a side view showing the configuration of the mover of the straight-curve guide device according to the first embodiment. [Figure 4] FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. [Figure 5] FIG. 5 is a cross-sectional view taken along the height direction of the first swing part in the first embodiment. [Figure 6] FIG. 6 is a cross-sectional view for explaining the configuration of a straight / curve guide device according to the third embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0010] [Outline of the embodiment] A straight / curve guide device according to the present disclosure includes a rail including a straight portion and a curved portion, and a mover movable on the rail. The mover includes a frame, a first swing section connected to the frame and in contact with the rail, and a second swing section connected to the frame and spaced from the first swing section in the longitudinal direction of the rail and in contact with the rail. The first swing section and the second swing section are configured to be rotatable about a connection section with the frame within a plane including the longitudinal direction and width direction of the rail. Each of the first swing section and the second swing section includes an arm section extending in the width direction of the rail, a first bearing section located on one side of the longitudinal center of the arm section, and a second bearing section located on the other side of the longitudinal center of the arm section. The first bearing portion includes a first race member fixed to the arm portion and penetrating the arm portion in the rail height direction, the first race member having an annular first raceway surface on its outer circumferential surface, a second race member having an annular second raceway surface opposite the first raceway surface on its inner circumferential surface and a first annular rail groove on its outer circumferential surface that contacts the rail, and a plurality of first rolling elements arranged in a first annular rolling path defined by the first and second raceway surfaces.The second bearing portion includes a third race member fixed to the arm portion and penetrating the arm portion in the rail height direction, the fourth race member having an annular fourth raceway surface opposite the third raceway surface on its inner circumferential surface and a second annular rail groove on its outer circumferential surface that contacts the rail, and a plurality of second rolling elements arranged in a second annular rolling path defined by the third and fourth raceway surfaces. The straight / curve guide device further includes an elastic member that is arranged to straddle the arm portion of the first swing portion and the arm portion of the second swing portion, and that is in a compressed state in which it is compressed in the longitudinal direction of the rail, or in a tensile state in which it is pulled in the longitudinal direction of the rail.

[0011] In the straight / curve guide device, a compressed or tensile elastic member is disposed between the arm portion of the first swing portion and the arm portion of the second swing portion. Therefore, a force acts on both swing portions in a direction that moves the first swing portion and the second swing portion away from each other or in a direction that moves the first swing portion and the second swing portion toward each other. This allows the first swing portion and the second swing portion to rotate around the connection portion with the frame in accordance with the width of the rail, preventing the gap between the rail and the rail groove from widening. Therefore, the straight / curve guide device can prevent a decrease in guiding accuracy due to the gap between the rail and the rail groove.

[0012] In the straight / curve guide device, a plurality of elastic members may be arranged in a line in the width direction of the rail. With this configuration, it is possible to more effectively prevent the gap between the rail and the rail groove from widening.

[0013] In the above-mentioned straight / curve guide device, the arm portion of the first swing portion may include a first arm side surface facing the second swing portion and extending in the width direction of the rail. The arm portion of the second swing portion may include a second arm side surface facing the first swing portion and extending in the width direction of the rail. The arm portion of the first swing portion may be formed with a first hole that opens toward the first arm side surface and has a depth in the longitudinal direction of the rail. The arm portion of the second swing portion may be formed with a second hole that opens toward the second arm side surface and has a depth in the longitudinal direction of the rail. The elastic member may be disposed across the first swing portion and the second swing portion so as to be housed in the first hole and the second hole. With this configuration, the elastic member can be stably disposed between the arm portion of the first swing portion and the arm portion of the second swing portion.

[0014] In the straight / curve guide device, the elastic member may be a spring.

[0015] [Specific example of embodiment] Next, specific embodiments of the straight / curve guide device of the present disclosure will be described with reference to the drawings. In the following drawings, the same or corresponding parts are designated by the same reference characters, and the description thereof will not be repeated.

[0016] (Embodiment 1) First, the configuration of the straight-curve guiding device 1 according to the first embodiment will be described with reference to Figs. 1 to 5. Fig. 1 is a perspective view showing the configuration of the straight-curve guiding device 1. Fig. 2 is a front view showing the configuration of the mover 3 of the straight-curve guiding device 1. Fig. 3 is a side view showing the configuration of the mover 3 of the straight-curve guiding device 1. Fig. 4 is a cross-sectional view taken along line IV-IV in Fig. 2. Fig. 5 is a cross-sectional view taken along the height direction D3 of the first swing portion 21.

[0017] As shown in FIG. 1, the straight / curve guide device 1 mainly comprises a rail 2 and a mover 3 that is movable on the rail 2. The rail 2 includes a straight section 2A and a curved section 2B that connects to the end of the straight section 2A. The mover 3 mainly comprises a frame 10, a first swing section 21, and a second swing section 22. Each of these components will be described below. In this specification, the longitudinal direction D1, width direction D2, and height direction D3 of the rail 2 correspond to the directions shown in FIGS. 1 to 5.

[0018] 1, frame 10 includes a first frame portion 11 and a second frame portion 12. First frame portion 11 is a portion where first swing portion 21 and second swing portion 22 are connected, and has a rectangular parallelepiped shape that is long in longitudinal direction D1. First frame portion 11 includes a first surface 11A (lower surface) facing downward in height direction D3, and a second surface 11B (upper surface) facing opposite first surface 11A.

[0019] The second frame portion 12 has a rectangular parallelepiped shape that is elongated in the height direction D3. As shown in FIG. 1 , the second frame portion 12 extends perpendicularly to the first frame portion 11 from an end of the first frame portion 11 in the width direction D2. The second frame portion 12 includes a third surface 12A facing one side in the width direction D2 and a fourth surface 12B facing the opposite side from the third surface 12A. A first protrusion 13 that protrudes in the width direction D2 and extends in the height direction D3 is formed at approximately the center of the third surface 12A in the longitudinal direction D1. Meanwhile, a second protrusion 14 that protrudes in the opposite direction to the first protrusion 13 in the width direction D2 and extends in the height direction D3 is formed at approximately the center of the fourth surface 12B in the longitudinal direction D1.

[0020] The first swing portion 21 is a portion that comes into contact with the rail 2. As shown in FIG. 1, the first swing portion 21 is connected to the first surface 11A side of the first frame portion 11. More specifically, as shown in FIG. 5, the first frame portion 11 has an insertion hole 11C that opens to the first surface 11A side and has a depth in the height direction D3. The insertion hole 11C has a circular shape when viewed in the height direction D3. A part of the first swing portion 21 (a fifth track member 85 described later) is inserted into the insertion hole 11C, and the first swing portion 21 is connected to the first frame portion 11 by tightening a bolt B1 (FIG. 1).

[0021] 5, an oil supply hole 11D that communicates with the insertion hole 11C in the height direction D3 is formed in the first frame portion 11. The oil supply hole 11D has a circular shape that is concentric with the insertion hole 11C and has a smaller diameter than the insertion hole 11C when viewed in the height direction D3. The oil supply hole 11D opens to the second surface 11B side.

[0022] The second swing section 22 (FIG. 1) is a portion that comes into contact with the rail 2, similar to the first swing section 21. As shown in FIG. 1, the second swing section 22 is connected to the frame 10 (first frame section 11) at a distance from the first swing section 21 in the longitudinal direction D1. The first swing section 21 and the second swing section 22 are configured to be rotatable about the connection section with the frame 10 within an imaginary plane that includes the longitudinal direction D1 and the width direction D2. Because the second swing section 22 is connected to the frame 10 similar to the first swing section 21, a description of the mounting structure of the second swing section 22 to the frame 10 will be omitted.

[0023] Next, the configuration of the first swing section 21 will be described in detail with reference to FIG. 5. As shown in FIG. 5, the first swing section 21 includes an arm section 43, a first bearing section 41, and a second bearing section 42. The arm section 43 extends in the width direction D2. The first bearing section 41 is disposed on one side (one end of the arm section 43 in the longitudinal direction) of the arm section 43 as viewed from the center of the arm section 43 in the longitudinal direction (the width direction D2 of the rail 2). The second bearing section 42 is disposed on the other side (the other end of the arm section 43 in the longitudinal direction) of the arm section 43 as viewed from the center of the arm section 43 in the longitudinal direction. As shown in FIG. 5, a first through hole 43A is formed in the arm section 43 on one side as viewed from the center of the arm section 43 in the longitudinal direction, penetrating the arm section 43 in the height direction D3. Meanwhile, a second through hole 43B is formed in the arm section 43 on the other side as viewed from the center of the arm section 43 in the longitudinal direction.

[0024] 5, the first bearing portion 41 includes a first race member 51, a second race member 54, and a fifth race member 85. The first race member 51 penetrates the arm portion 43 in the height direction D3 and is fixed to the arm portion 43. The first race member 51 in this embodiment includes a first stud 52 that penetrates the arm portion 43 in the height direction D3 (that is, is inserted into the first through hole 43A), and an annular first nut 53 that surrounds the outer peripheral surface of the first stud 52.

[0025] The first stud 52 includes a cylindrical shaft portion 52A that is inserted into the first through hole 43A, and a head portion 52B that is larger in diameter than the shaft portion 52A and is connected to the lower end of the shaft portion 52A. As shown in Fig. 5, the outer peripheral surface of the shaft portion 52A is in contact with the wall surface of the first through hole 43A over the entire circumferential direction. A first screw portion (male screw portion) is formed on the outer peripheral surface of the tip end (opposite the head portion 52B) of the shaft portion 52A. A second screw portion (female screw portion) that meshes with the first screw portion is formed on the inner peripheral surface of the first nut 53 over the entire circumferential direction.

[0026] As shown in Fig. 5, a first oil supply passage 52C is formed inside the first stud 52. The first oil supply passage 52C includes a first path portion that extends inside the shaft portion 52A in the height direction D3, and a second path portion that connects to the lower end of the first path portion and extends radially inside the head portion 52B. A first grease nipple 52D is disposed at the entrance of the first oil supply passage 52C. Lubricating oil can be supplied between the head portion 52B of the first stud 52 and the second raceway member 54 via the first oil supply passage 52C.

[0027] The first raceway member 51 has an annular first raceway surface 61 on its outer circumferential surface. As shown in Fig. 5, the first raceway surfaces 61 in this embodiment are formed in a plurality of rows (two rows) spaced apart in the height direction D3 on the outer circumferential surface of the head 52B. The first raceway surfaces 61 in this embodiment have a V-shape in cross section along the height direction D3, but are not limited to this.

[0028] The first raceway member 51 has an annular fifth raceway surface 65 on its outer circumferential surface. As shown in FIG. 5 , the fifth raceway surface 65 in this embodiment is formed on the outer circumferential surface of the first nut 53 over the entire circumferential direction. In this embodiment, the fifth raceway surface 65 has a V-shape in cross section along the height direction D3, but is not limited to this. Note that the first raceway member 51 is not limited to including the first stud 52 and the first nut 53; for example, the first nut 53 may be omitted. In this case, the fifth raceway surface 65 may be formed on the outer circumferential surface of the shank 52A of the first stud 52.

[0029] The second track member 54 is an annular member having an inner diameter larger than that of the first track surface 61. The second track member 54 has an annular second track surface 62 on its inner peripheral surface that faces the first track surface 61 in the radial direction of the second track member 54. In this embodiment, the second track surface 62 has a V-shape facing away from the first track surface 61 in a cross section taken along the height direction D3, but is not limited to this. As shown in FIG. 5 , the second track member 54 has an annular first rail groove 54A on its outer peripheral surface that contacts the rail 2. In this embodiment, the first rail groove 54A has a V-shape in a cross section taken along the height direction D3, but is not limited to this.

[0030] The fifth raceway member 85 (outer ring) is an annular member having an inner diameter larger than that of the fifth raceway surface 65. The fifth raceway member 85 has an annular sixth raceway surface 66 on its inner peripheral surface that faces the fifth raceway surface 65 in the radial direction of the fifth raceway member 85. The sixth raceway surface 66 has a V-shape facing away from the fifth raceway surface 65 in a cross section taken along the height direction D3, but is not limited to this. An annular hole 85A is formed in the fifth raceway member 85, overlapping with the inlet of the first oil supply passage 52C in the height direction D3. The annular hole 85A overlaps with the oil supply hole 11D in the height direction D3.

[0031] The fifth track member 85 is connected to the frame 10 (first frame portion 11). Specifically, as shown in FIG. 5, the fifth track member 85 is inserted into an insertion hole 11C and fixed to the first frame portion 11 by a plurality of bolts B1 (FIG. 1). The outer peripheral surface of the fifth track member 85 is in contact with the wall surface of the insertion hole 11C over the entire circumferential direction. As shown in FIG. 5, the lower end face of the fifth track member 85 in the height direction D3 is substantially flush with the first surface 11A of the frame 10. Meanwhile, the upper end face of the fifth track member 85 in the height direction D3 has a plurality of (for example, four) female screw holes (not shown) formed at intervals in the circumferential direction, into which the bolts B1 (FIG. 1) engage.

[0032] The first bearing portion 41 further includes a plurality of first rolling elements 71. In this embodiment, the first rolling elements 71 are cylindrical rollers, and are arranged in an annular first rolling path defined by the first raceway surface 61 and the second raceway surface 62. The outer circumferential surface of the first rolling elements 71 is in contact with the first raceway surface 61 and the second raceway surface 62.

[0033] The first bearing portion 41 further includes a plurality of third rolling elements 73. In this embodiment, the third rolling elements 73 are cylindrical rollers, and are arranged in an annular third rolling path defined by the fifth raceway surface 65 and the sixth raceway surface 66. The outer circumferential surfaces of the third rolling elements 73 are in contact with the fifth raceway surface 65 and the sixth raceway surface 66.

[0034] As shown in FIG. 5 , the fifth raceway member 85 has an insertion port formed therein for inserting the third rolling element 73 into the third rolling path, the insertion port penetrating a portion of the circumference of the fifth raceway member 85 in the radial direction. This insertion port is closed by the first cover member 86. The first cover member 86 includes a cover raceway surface (a surface facing the fifth raceway surface 65 in the radial direction of the fifth raceway member 85) that contacts the third rolling element 73, and a cover outer surface positioned radially opposite the cover raceway surface of the fifth raceway member 85. The cover raceway surface is substantially flush with the sixth raceway surface 66 and defines the third rolling path together with the fifth raceway surface 65 and the sixth raceway surface 66. When the fifth raceway member 85 is inserted into the insertion hole 11C, the cover outer surface contacts the wall surface of the insertion hole 11C. The first cover member 86 may be fixed to the fifth raceway member 85 by a fixing member such as a pin.

[0035] 5, a throw-in opening is formed in second raceway member 54 for throwing first rolling elements 71 into the first rolling path. A second cover member 55 is disposed in this throw-in opening. Second cover member 55 is fixed to second raceway member 54 by a fixing member such as a pin 56.

[0036] The second bearing portion 42 includes a third raceway member 57, a fourth raceway member 58, a second nut 83, and an eccentric collar 84. The third raceway member 57 penetrates the arm portion 43 in the height direction D3 and is fixed to the arm portion 43. As shown in FIG. 5 , the third raceway member 57 includes a shaft portion 57A that penetrates the arm portion 43 in the height direction D3 (that is, is inserted into the second through hole 43B), and a head portion 57B that has a larger diameter than the shaft portion 57A and is connected to the lower end of the shaft portion 57A. The third raceway member 57 has an annular third raceway surface 63 on the outer peripheral surface of the head portion 57B. In this embodiment, the third raceway surfaces 63 form multiple (two) rows spaced apart in the height direction D3, but this is not limited to this.

[0037] A third threaded portion (male threaded portion) is formed on the outer peripheral surface of the tip end (opposite the head portion 57B) of the shaft portion 57A. A fourth threaded portion (female threaded portion) that meshes with the third threaded portion is formed over the entire circumferential direction on the inner peripheral surface of the second nut 83. As shown in FIG. 5, the small diameter portion of the eccentric collar 84 is inserted between the outer peripheral surface of the shaft portion 57A and the wall surface of the second through hole 43B. This small diameter portion is annular and has a shape in which the radial thickness varies over the circumferential direction.

[0038] A second oil supply passage 57C is formed inside the third raceway member 57. The second oil supply passage 57C includes a third path portion extending inside the shaft portion 57A in the height direction D3 and a second path portion connected to the lower end of the third path portion and extending radially inside the head portion 57B. A second grease nipple 57D is disposed at the inlet of the second oil supply passage 57C. Lubricating oil can be supplied between the head portion 57B and the fourth raceway member 58 via the second oil supply passage 57C.

[0039] The fourth raceway member 58 is an annular member having an inner diameter larger than that of the third raceway surface 63. The fourth raceway member 58 has an annular fourth raceway surface 64 on its inner peripheral surface that faces the third raceway surface 63 in the radial direction of the fourth raceway member 58. In this embodiment, the fourth raceway surface 64 has a V-shape facing away from the third raceway surface 63 in a cross section taken along the height direction D3, but is not limited to this. As shown in FIG. 5 , the fourth raceway member 58 has an annular second rail groove 58A on its outer peripheral surface that contacts the rail 2. In this embodiment, the second rail groove 58A has a V-shape in a cross section taken along the height direction D3, but is not limited to this.

[0040] The second bearing portion 42 further includes a plurality of second rolling elements 72. In the present embodiment, the second rolling elements 72 are cylindrical rollers, and are arranged in an annular second rolling path defined by the third raceway surface 63 and the fourth raceway surface 64. The outer circumferential surfaces of the second rolling elements 72 are in contact with the third raceway surface 63 and the fourth raceway surface 64.

[0041] 5, a throw-in opening for throwing the second rolling elements 72 into the second rolling path is formed in the fourth raceway member 58. A third cover member 81 is disposed in this throw-in opening. The third cover member 81 is fixed to the fourth raceway member 58 by a fixing member such as a pin 82.

[0042] The second swing section 22 (FIG. 1) basically has the same configuration as the first swing section 21. Therefore, a detailed description of the configuration of the second swing section 22 will be omitted.

[0043] As shown in Fig. 4, the arm portion 43 of the first swing portion 21 includes a first arm side surface 91. The first arm side surface 91 faces the second swing portion 22 and extends in the width direction D2. The arm portion 43 of the second swing portion 22 includes a second arm side surface 92 that is substantially parallel to the first arm side surface 91. As shown in Fig. 4, the second arm side surface 92 faces the first swing portion 21 (first arm side surface 91) and extends in the width direction D2.

[0044] As shown in Fig. 4, a first hole 93 is formed in the arm portion 43 of the first swing portion 21. The first hole 93 is a bottomed hole that opens to the first arm side surface 91 side and has a depth in the longitudinal direction D1. At least one of is formed in a portion of the arm portion 43 that does not overlap with the frame 10 in the cross-sectional view of Fig. 4. In this embodiment, the bottom of the first hole 93 is located closer to the second swing portion 22 than the center of the arm portion 43 in the longitudinal direction D1, but is not limited to this. In this embodiment, the first hole 93 has an elliptical shape that is long in the longitudinal direction D1 when viewed in the longitudinal direction D1, but is not limited to this.

[0045] As shown in Fig. 4, a second hole 94 is formed in the arm portion 43 of the second swing portion 22. The second hole 94 is a bottomed hole that opens to the second arm side surface 92 side and has a depth in the longitudinal direction D1. At least one of is formed in a portion of the arm portion 43 that does not overlap with the frame 10 in the cross-sectional view of Fig. 4. The second hole 94 faces the first hole 93 in the longitudinal direction D1. In other words, the first hole 93 and the second hole 94 are each located on an imaginary straight line extending in the longitudinal direction D1. In this embodiment, the second hole 94 has approximately the same depth as the first hole 93, but is not limited to this.

[0046] 3 and 4, the mover 3 further includes an elastic member 30. The elastic member 30 in this embodiment is a coil spring, and is arranged so as to straddle the arm portion 43 of the first swing portion 21 and the arm portion 43 of the second swing portion 22 (FIG. 4). More specifically, the elastic member 30 in this embodiment is in a compressed state in which it is compressed in the longitudinal direction D1, and is arranged so as to straddle the first swing portion 21 and the second swing portion 22 so as to be housed in the first hole 93 and the second hole 94. That is, the elastic member 30 has a shape that extends in the longitudinal direction D1, and one end portion in the longitudinal direction D1 is housed in the first hole 93, and the other end portion in the longitudinal direction D1 is housed in the second hole 94. As a result, the restoring force of the elastic member 30, which is a compression spring, acts on the bottom of each of the first hole 93 and the second hole 94, and a force in the direction of separating the first swing portion 21 and the second swing portion 22 from each other is applied to the first swing portion 21 and the second swing portion 22 by the elastic member 30.

[0047] As described above, in the straight / curve guiding device 1 according to this embodiment, the elastic member 30 in a compressed state is disposed so as to straddle the arm portion 43 of the first swing portion 21 and the arm portion 43 of the second swing portion 22. Therefore, a force acts on the first swing portion 21 and the second swing portion 22 in a direction that separates the first swing portion 21 and the second swing portion 22 from each other. This causes the first swing portion 21 and the second swing portion 22 to rotate around the connection portion with the frame 10 in accordance with the width dimension of the rail 2, thereby preventing the gap between the rail 2 and the rail grooves (the first rail groove 54A and the second rail groove 58A) from widening. Therefore, the straight / curve guiding device 1 according to this embodiment can prevent a decrease in guiding accuracy caused by the gap between the rail 2 and the rail grooves.

[0048] (Embodiment 2) Next, a straight / curve guide device according to embodiment 2 will be described. Embodiment 2 is basically the same as embodiment 1 above, but differs in that the elastic member 30 is a tension spring. Only the differences from embodiment 1 above will be described below.

[0049] The elastic member 30 in the second embodiment is arranged in a tensile state in which it is pulled in the longitudinal direction D1, straddling the arm portion 43 of the first swing portion 21 and the arm portion 43 of the second swing portion 22. One end of the elastic member 30 in the longitudinal direction D1 is connected to the bottom of the first hole 93. Meanwhile, the other end of the elastic member 30 in the longitudinal direction D1 is connected to the bottom of the second hole 94.

[0050] In the second embodiment, a tension spring is used as the elastic member 30, and therefore a force acts on the first swing portion 21 and the second swing portion 22 in a direction that moves them closer to each other. As a result, similar to the first embodiment, the first swing portion 21 and the second swing portion 22 rotate around the connection portion with the frame 10 in accordance with the width dimension of the rail 2, and it is possible to prevent the gap between the rail 2 and the rail groove from widening.

[0051] (Embodiment 3) Next, a straight / curve guide device according to a third embodiment will be described with reference to Fig. 6. The third embodiment is basically the same as the first or second embodiment, but differs in that it includes a plurality of elastic members 30. Only the differences from the first and second embodiments will be described below.

[0052] 6, a plurality of first holes 93 (two in this embodiment) are formed at intervals from each other in the width direction D2. Similarly, a plurality of second holes 94 (two in this embodiment) are formed at intervals from each other in the width direction D2.

[0053] The elastic members 30 are compression springs or tension springs, and a plurality of them are arranged in a row in the width direction D2. As shown in Fig. 6, the elastic members 30 are housed in each of the plurality of first holes 93 and second holes 94. This can further increase the force that moves the first swing portion 21 and the second swing portion 22 away from each other or the force that moves them toward each other.

[0054] (Other embodiments) Here, other embodiments will be described.

[0055] In the above embodiment, the case where the first hole 93 and the second hole 94 are respectively formed in the arm portion 43 has been described as an example, but this is not limiting. One or both of the first hole 93 and the second hole 94 may be omitted.

[0056] In the above embodiment, a coil spring is used as the elastic member, but this is not limiting. For example, a leaf spring or a torsion spring can also be used as the elastic member. Furthermore, the elastic member is not limited to a spring, and may be, for example, rubber or other material.

[0057] In the above embodiment, the first swing section 21 and the second swing section 22 are connected to the frame 10 at their ends in the width direction D2, but this is not limiting. For example, the center of each arm section of the first swing section and the second swing section in the longitudinal direction may be connected to the frame.

[0058] The embodiments disclosed herein are illustrative in all respects and should not be construed as limiting. The scope of the present invention is defined by the claims, not the above description, and is intended to include all modifications within the meaning and scope of the claims. [Explanation of symbols]

[0059] 1 straight and curved guide device, 2 rail, 2A straight portion, 2B curved portion, 3 movable element, 10 frame, 11 first frame portion, 11A first surface, 11B second surface, 11C insertion hole, 11D oil supply hole, 12 second frame portion, 12A third surface, 12B fourth surface, 13 first protrusion, 14 second protrusion, 21 first swing portion, 22 second swing portion, 30 elastic member, 41 first bearing portion, 42 second bearing portion, 43 arm portion, 43A first through hole, 43B second through hole, 51 first raceway member, 52 first stud, 52A, 57A shaft portion, 52B, 57B head, 52C first oil supply passage, 52D first grease nipple, 53 first nut, 54 second raceway member, 54A first rail groove, 55 Second cover member, 56, 82 pin, 57 third raceway member, 57C second oil supply passage, 57D second grease nipple, 58 fourth raceway member, 58A second rail groove, 61 first raceway surface, 62 second raceway surface, 63 third raceway surface, 64 fourth raceway surface, 65 fifth raceway surface, 66 sixth raceway surface, 71 first rolling element, 72 second rolling element, 73 third rolling element, 81 third cover member, 83 second nut, 84 eccentric collar, 85 fifth raceway member, 85A annular hole, 86 first cover member, 91 first arm side surface, 92 second arm side surface, 93 first hole, 94 second hole, B1 bolt, D1 longitudinal direction, D2 width direction, D3 height direction.

Claims

1. a rail including a straight section and a curved section; a movable element that is movable on the rail, The mover is The frame and a first swing portion connected to the frame and in contact with the rail; a second swing portion connected to the frame and spaced apart from the first swing portion in the longitudinal direction of the rail and in contact with the rail; the first swing portion and the second swing portion are configured to be rotatable about a connection portion with the frame within a plane including the longitudinal direction of the rail and the width direction of the rail, Each of the first swing portion and the second swing portion is an arm portion extending in the width direction of the rail; a first bearing portion disposed on one side of a center portion of the arm portion in a longitudinal direction; a second bearing portion disposed on the other side of the arm portion as viewed from the center portion in the longitudinal direction, The first bearing portion is a first track member that penetrates the arm portion in the height direction of the rail, has an annular first track surface on its outer circumferential surface, and is fixed to the arm portion; a second raceway member having an annular second raceway surface on its inner circumferential surface that faces the first raceway surface, and an annular first rail groove on its outer circumferential surface that contacts the rail; a plurality of first rolling elements disposed in a first annular rolling path defined by the first raceway surface and the second raceway surface, The second bearing portion is a third track member that penetrates the arm portion in the height direction of the rail, has an annular third track surface on its outer circumferential surface, and is fixed to the arm portion; a fourth raceway member having an annular fourth raceway surface on its inner peripheral surface that faces the third raceway surface, and an annular second rail groove on its outer peripheral surface that contacts the rail; a plurality of second rolling elements disposed in a second annular rolling path defined by the third raceway surface and the fourth raceway surface, An elastic member is further provided, the elastic member being arranged so as to straddle between the arm portion of the first swing portion and the arm portion of the second swing portion, and being in a compressed state in which it is compressed in the longitudinal direction of the rail or in a tensile state in which it is pulled in the longitudinal direction of the rail, the arm portion of the first swing portion includes a first arm side surface facing the second swing portion and extending in the width direction of the rail, the arm portion of the second swing portion includes a second arm side surface facing the first swing portion and extending in the width direction of the rail, a first hole that opens to a side surface of the first arm and has a depth in the longitudinal direction of the rail is formed in the arm portion of the first swing portion; a second hole that opens to a side surface of the second arm and has a depth in the longitudinal direction of the rail is formed in the arm portion of the second swing portion, The elastic member is disposed across the first swing portion and the second swing portion so as to be accommodated in the first hole and the second hole. Straight guide device.

2. The straight / curve guide device according to claim 1 , wherein a plurality of the elastic members are arranged in the width direction of the rail.

3. 3. The straight / curve guide device according to claim 1, wherein the elastic member is a spring.

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