Direct drive guide device

Abstract

The present application provides a direct guide device that is easy to assemble. The direct guide device has two rails that are relatively movable in the length direction by means of at least one rolling body, and a holder (10) that holds the rolling body (9a, 9b) and holds a gear (13) engaged with an engaging portion provided to at least one of the two rails. The holder (10) has a first divided body (11) that is integrally formed with a rolling body holding portion (21) that holds the rolling body (9a, 9b) and a gear holding portion (22) that holds the gear (13), and a second divided body (12) that is integrally formed with a rolling body holding portion (31) that holds the rolling body (9a, 9b) and a gear holding portion (32) that holds the gear (13). The first divided body (11) and the second divided body (12) are combined with each other.

Description

Technical Field

[0001] The present invention relates to a direct-acting guide device having a mechanism for preventing positional displacement of the retainer. Background Technology

[0002] A known linear guide device (see Patent Document 1) includes a position offset prevention mechanism to prevent position offset of the retainer. This linear guide device has two guide rails that can move relative to each other along the length direction by means of at least one rolling element. The rolling element is held by the retainer. If the two guide rails are repeatedly moved relative to each other, the retainer may deviate from its normal position. To prevent position offset of the retainer, a position offset prevention mechanism is provided.

[0003] The position misalignment prevention mechanism consists of a rack mounted on the guide rail and a pinion mounted on the retainer. When the two guide rails move relative to each other, the pinion meshes with the rack and moves to the correct position. Therefore, it prevents position misalignment of the retainer.

[0004] Existing technical documents

[0005] Patent documents

[0006] Patent Document 1: Japanese Patent Application Publication No. 2004-197850 Summary of the Invention

[0007] The problem that the invention aims to solve

[0008] In the direct-acting guide device described in Patent Document 1, a retainer for holding the rolling element and a retainer for holding the pinion are respectively manufactured. Furthermore, the retainer for holding the pinion is inserted into the mounting hole of the retainer, and the retainer is engaged with the retainer by a snap-fit ​​connection.

[0009] However, the direct-drive guide device described in Patent Document 1 requires three steps: (1) assembling the retainer and the rolling element, (2) assembling the pinion and the retainer, and (3) assembling the retainer and the retainer. There is a problem that the assembly is time-consuming.

[0010] The present invention was made in view of the above-mentioned problems, and its object is to provide a direct-drive guiding device that is easy to assemble.

[0011] Solution for solving the problem

[0012] To address the aforementioned issues, one aspect of the present invention is a direct-acting guide device comprising: two guide rails that are movable relative to each other along their length by means of at least one rolling element; and a retainer that holds the rolling element and a gear engaging with a meshing portion disposed on at least one of the two guide rails, wherein the retainer comprises: a first segment integrally formed with a rolling element retaining portion for holding the rolling element and a gear retaining portion for holding the gear; and a second segment integrally formed with a rolling element retaining portion for holding the rolling element and a gear retaining portion for holding the gear, the first segment and the second segment being coupled together.

[0013] Invention Effects

[0014] According to the present invention, by combining the first segment and the second segment, both the rolling element and the gear can be held simultaneously. Therefore, the assembly of the direct-drive guide device is easy. Furthermore, since the roller and gear are held by combining the first segment and the second segment, the roller and gear can be held reliably. Attached Figure Description

[0015] Figure 1 This is a perspective view (including a partial sectional view) of the direct-drive guide device according to the first embodiment of the present invention.

[0016] Figure 2 This is a perspective view of the retainer assembled in the direct-acting guide device of this embodiment.

[0017] Figure 3 yes Figure 2 III-direction view.

[0018] Figure 4 This is a perspective view of the first segment of the retainer of the direct-acting guide device in this embodiment.

[0019] Figure 5 This is a top view of the first segment mentioned above.

[0020] Figure 6 This is a perspective view showing the state in which the first segment is assembled with rolling elements and gears.

[0021] Figure 7 This is a perspective view of the second segment of the retainer of the direct-acting guide device in this embodiment.

[0022] Figure 8 This is a top view of the second segment mentioned above.

[0023] Figure 9 This is a perspective view of the retainer assembled in the direct-drive guide device according to the second embodiment of the present invention.

[0024] Figure 10 yes Figure 9 The X-direction view.

[0025] Figure 11 This is a perspective view of the aforementioned retainer (the state after the rollers and gears have been removed).

[0026] Figure 12 This is an exploded perspective view of the aforementioned retainer. Detailed Implementation

[0027] Hereinafter, a direct-drive guiding device according to an embodiment of the present invention will be described based on the accompanying drawings. However, the direct-drive guiding device of the present invention can be embodied in various ways and is not limited to the embodiments described in this specification. This embodiment is provided so that those skilled in the art can fully understand the intent of the invention by making the specification sufficiently clear.

[0028] (First Implementation)

[0029] Figure 1 This is a perspective view of the direct-drive guide device 1 according to the first embodiment of the present invention. 2 and 3 are guide rails. V-shaped grooves 4 and 5 are formed in guide rails 2 and 3 respectively. Grooves 4 and 5 have mutually perpendicular track surfaces 7a and 7b and track surfaces 8a and 8b. A roller 9, serving as a rolling element, is disposed between the opposing grooves 4 and 5 of guide rails 2 and 3. Guide rails 2 and 3 can move relative to each other along their length direction by means of the roller 9.

[0030] Roller 9 is a cross roller 9a, 9b whose axes are perpendicular to those of adjacent rollers 9 (see reference). Figure 2 When viewed from the side, roller 9 is approximately square, with its diameter slightly larger than its length along its axis. The side of roller 9a contacts the track surface 7a of guide rail 2 and the track surface 8b of guide rail 3. The side of roller 9b contacts the track surface 7b of guide rail 2 and the track surface 8a of guide rail 3. The force acting on guide rail 2 is transmitted to guide rail 3 via rollers 9a and 9b.

[0031] Mounting holes 2a are formed in guide rail 2 for mounting on a worktable or the like. Mounting holes 3a are formed in guide rail 3 for mounting on a base or the like. The shape of guide rail 3 is approximately the same as the shape obtained by reversing guide rail 2 by 180°.

[0032] like Figure 2 As shown, rollers 9a and 9b are held along guide rails 2 and 3 in a retainer 10 that extends along the length direction. A small gear-shaped gear 13 is also held in the retainer 10 in a rotatable manner.

[0033] like Figure 1As shown, rack-shaped meshing portions 2b and 3b are formed at the bottom of the grooves 4 and 5 of the guide rails 2 and 3. The teeth 13a of the gear 13 engage with the meshing portions 2b and 3b. The relative position of the retainer 10 with respect to the guide rails 2 and 3 is determined by the relative position of the guide rails 2 and 3. Therefore, positional displacement of the retainer 10 can be prevented. Figure 1 In order to show the gear 13 and the meshing parts 2b and 3b, the guide rails 2 and 3 are partially missing.

[0034] It should be noted that the rack-shaped meshing portions 2b and 3b of the guide rails 2 and 3 only need to be able to engage with the gear 13, and can be composed of involute teeth or multiple recesses formed at equal intervals along the length of the guide rails 2 and 3. Similarly, the teeth 13a of the pinion-shaped gear 13 also only need to be able to engage with the meshing portions 2b and 3b, and can be composed of involute teeth or multiple protrusions embedded in the recesses.

[0035] like Figure 2 As shown, rollers 9a and 9b and gear 13 are held in retainer 10. Gear 13 is disposed approximately at the center of the length direction of retainer 10. Retainer 10 has a first partition 11 and a second partition 12 divided along a mating surface 14 extending in the length direction of guides 2 and 3. The axis 9a1 of roller 9a and the center C of roller 9b (the axial center of roller 9b on axis 9b1) are disposed in a plane substantially the same as the plane P including the mating surface 14. The axis 9b1 of roller 9b is substantially orthogonal to plane P.

[0036] like Figure 4 As shown, in the first segment 11, the rolling element holding portion 21 of the retaining rollers 9a and 9b and the gear holding portion 22 of the retaining gear 13 are integrally formed. The rolling element holding portion 21 and the gear holding portion 22 are integrally formed, for example, by resin molding, metal molding, lamination molding or machining.

[0037] The first segment 11 has recesses 23a and 23b formed in the rolling element holding portion 21 to receive a portion of the rollers 9a and 9b. For example, the recess 23a receives one side half (lower half) of the roller 9a with its axis 9a1 facing laterally. The recess 23a is formed in a semi-cylindrical shape to match the shape of one side half of the roller 9a. The roller 9a is inserted into the recess 23a in a direction orthogonal to the axis 9a1. Figure 5 As shown in the top view, an opening 23a1 is formed at the bottom of the recess 23a such that the side surface of the roller 9a is exposed. An opening 23a2 is formed on the wall of the recess 23a such that the bottom surface of the roller 9a is exposed (see reference). Figure 4 ).

[0038] like Figure 4As shown, a recess 23b accommodates one side half (lower half) of the roller 9b with its axis 9b1 facing longitudinally. The recess 23b is, for example, formed as a short cylinder matching the shape of one side half of the roller 9b. The roller 9b is inserted into the recess 23b along its axial direction. An opening 23b1 is formed at the bottom of the recess 23b in such a way that the bottom surface of the roller 9b is exposed (see reference). Figure 5 An opening 23b2 is formed in the wall of the recess 23b in such a way that the side of the roller 9b is exposed (see reference). Figure 4 ).

[0039] like Figure 4 As shown, an anti-detachment portion 24 extending along the length direction is integrally formed on the first segment 11. The anti-detachment portion 24 engages with the corner portions of roller 9a and roller 9b to prevent rollers 9a and 9b from falling off along the axial direction. The anti-detachment portion 24 is disposed between guide rails 2 and 3.

[0040] A plurality of protrusions 26 are integrally formed on the mating surface 14 of the rolling element holding portion 21 of the first segment 11. The protrusions 26 are used for positioning when the first segment 11 and the second segment 12 are mated. The second segment 12, described later, has holes for the protrusions 26 to be inserted.

[0041] A gear retaining surface 22a is formed in the gear retaining portion 22, which is inclined relative to the mating surface 14. The gear retaining surface 22a is substantially inclined at 45 degrees relative to the mating surface 14. The gear retaining surface 22a and the side surface 13b1 of the gear 13 (see reference) Figure 2 Opposite. The gear retaining surface 22a has a first inclined surface 22a1 and a second inclined surface 22a2 (see reference). Figure 5 The first inclined surface 22a1 and the second inclined surface 22a2 are inclined to each other so as to allow slight oscillation of the gear 13.

[0042] A shaft 13c for receiving gear 13 is formed in the gear holding part 22 (see reference). Figure 2 The recess 25 is groove-shaped and extends downward along the gear holding surface 22a from the upper end of the gear holding part 22.

[0043] Figure 6 The diagram shows the assembly of rollers 9a and 9b and gear 13 on the first segment 11. For example, one half of rollers 9a and 9b is inserted into the recesses 23a and 23b of the rolling element holding portion 21. Rollers 9a and 9b are supported by the rolling element holding portion 21. The shaft 13c of gear 13 is inserted into the recess 25 of gear holding portion 22. Gear 13 is supported by gear holding portion 22.

[0044] Figure 7 A three-dimensional view of the second segment 12 is shown. If... Figure 7The second segment 12 shown is reversed 180 degrees and combined with the first segment 11 to obtain... Figure 2 The retainer shown.

[0045] like Figure 7 As shown, in the second segment 12, the rolling element holding part 31 of the holding rollers 9a and 9b and the gear holding part 32 of the holding gear 13 are integrally formed.

[0046] The rolling element holding portion 31 of the second segment 12 has recesses 33a and 33b that receive portions of rollers 9a and 9b. For example, recess 33a receives one side half (upper half) of roller 9a with its axis 9a1 facing laterally. Recess 33a is formed in a semi-cylindrical shape matching the shape of one side half of roller 9a. Roller 9a is inserted into recess 33a in a direction orthogonal to axis 9a1. Figure 8 As shown in the top view, an opening 33a1 is formed at the bottom of the recess 33a such that the side surface of the roller 9a is exposed. An opening 33a2 is formed on the wall of the recess 33a such that the bottom surface of the roller 9a is exposed (see reference). Figure 7 ).

[0047] like Figure 7 As shown, the recess 33b accommodates one side (upper half) of the roller 9b with its axis 9b1 facing longitudinally. The recess 33b is formed as a short cylinder that matches the shape of one side of the roller 9b. The roller 9b is inserted into the recess 33b along its axial direction. Figure 8 As shown, an opening 33b1 is formed at the bottom of the recess 33b such that the bottom surface of the roller 9b is exposed. An opening 33b2 is formed on the wall of the recess 33b such that the side surface of the roller 9b is exposed (see reference). Figure 7 ).

[0048] like Figure 7 As shown, an anti-detachment portion 34 extending along the length direction is integrally formed on the second segment 12. The anti-detachment portion 34 engages with the corners of roller 9a and roller 9b to prevent rollers 9a and 9b from falling off along the axial direction. The anti-detachment portion 34 is disposed between guide rails 2 and 3.

[0049] The gear holding portion 32 of the second segment 12 has a gear holding surface 32a that is inclined relative to the mating surface 14. The gear holding surface 32a is substantially inclined at 45 degrees relative to the mating surface 14. The gear holding surface 32a and the side surface 13b2 of the gear 13 (see reference) Figure 2Opposite. A gear 13 is disposed between the gear holding surface 22a of the first segment 11 and the gear holding surface 32a of the second segment 12. The gear holding surface 32a has a first inclined surface 32a1 and a second inclined surface 32a2. The first inclined surface 32a1 and the second inclined surface 32a2 are inclined relative to each other so as to allow slight oscillation of the gear 13.

[0050] A recess 35 is formed in the gear holding portion 32 to accommodate the shaft 13c of the gear 13. The recess 35 is groove-shaped and extends from the upper end surface of the gear holding portion 32 along the gear holding surface 32a.

[0051] Holes 36 are formed on the mating surface 14 of the second segment 12 for the insertion of a plurality of protrusions 26 of the first segment 11. Figure 7 The second segment 12 is reversed and aligns with the first segment 11. Pressure is applied between the first segment 11 and the second segment 12 while they are being welded together. The conical tips of the plurality of protrusions 26 on the first segment 11 melt, thus joining the first segment 11 to the second segment 12. It should be noted that, instead of welding, the first segment 11 and the second segment 12 can also be joined by pressing, snap-fitting, or other methods.

[0052] The structure of the direct-acting guide device 1 according to this embodiment has been described above. The direct-acting guide device 1 according to this embodiment achieves the following effects.

[0053] If the first segment 11, which integrally forms the rolling element holding portions 21 and 31, and the gear holding portions 22 and 32, is combined with the second segment 12, the rollers 9a and 9b and the gear 13 can be held simultaneously. Therefore, the assembly of the direct-drive guide device 1 is easy.

[0054] Furthermore, in conventional linear guide devices, rollers are inserted into holes in a plate-shaped retainer, and the retainer deforms the claws surrounding the holes to hold the rollers (see Patent Document 1). Therefore, there is a problem of weak roller retention. According to the linear guide device 1 of this embodiment, since the first dividing body 11 and the second dividing body 12 are combined to hold the rollers 9a, 9b, and gear 13, the rollers 9a, 9b, and gear 13 can be reliably held.

[0055] Furthermore, when the position offset prevention mechanism transmits force from the gear 13, which is in the correct position, to the rollers 9a and 9b, which have experienced position offset, causing the rollers 9a and 9b to return to the correct position, the rolling element holding parts 21 and 31 are integrally formed with the gear holding parts 22 and 32, thus enabling reliable force transmission from the gear 13 to the rollers 9a and 9b.

[0056] The axis 9a1 of one of the adjacent rollers 9a and 9b is arranged on the same plane P as the mating surface 14. Therefore, rollers 9a and 9b can be assembled on the first partition 11 by simply placing them on the first partition 11, and rollers 9a and 9b are unlikely to fall off the first partition 11. Thus, the assembly of rollers 9a and 9b onto the first partition 11 is easy.

[0057] The first dividing body 11 and the second dividing body 12 have rolling element holding portions 21 and 31 with recesses 23b and 33b for inserting one of the adjacent rollers 9a and 9b along its axial direction, and recesses 23a and 33a for inserting the other roller 9a in a direction orthogonal to its axis 9a1. Therefore, rollers 9a and 9b can be easily assembled in the first dividing body 11 and the second dividing body 12.

[0058] The first segment 11 and the second segment 12 are fused together, thus enabling a stable combination of the first segment 11 and the second segment 12, and enabling more reliable retention of the rollers 9a, 9b and the gear 13.

[0059] (Second Implementation)

[0060] Figure 9 A perspective view is shown of the retainer 40 assembled in the direct-drive guide device of the second embodiment of the present invention. The structures of the guide rails 2 and 3, rollers 9a and 9b, and gear 13 are the same as those of the direct-drive guide device 1 of the first embodiment.

[0061] like Figure 9 As shown, rollers 9a and 9b and gear 13 are held in retainer 40. Gear 13 is positioned approximately at the center of the length of retainer 40. Retainer 40 has a first partition 41 and a second partition 42 that are engaged with each other, for example, by snap-fit. The first partition 41 and the second partition 42 have the same shape.

[0062] Figure 11 A perspective view of the retainer 40 is shown. Figure 12 An exploded perspective view of the retainer 40 is shown. Figure 12 As shown, in the first segment 41, the rolling element holding portion 51 of the retaining rollers 9a and 9b and the gear holding portion 52 of the retaining gear 13 are integrally formed. The rolling element holding portion 51 and the gear holding portion 52 are integrally formed, for example, by resin molding, metal molding, lamination molding or machining.

[0063] The first segment 41 has a recess 53a, 53b formed in the rolling element holding portion 51, which accommodates a portion of the rollers 9a, 9b. The recess 53a accommodates the roller 9a whose axis 9a1 faces upwards (see reference). Figure 9The recess 53a is formed as a short cylindrical shape that matches the shape of one side of the roller 9a. The roller 9a is inserted into the recess 53a along the axial direction.

[0064] The recess 53b houses the roller 9b with axis 9b1 pointing downwards (see reference). Figure 9 The recess 23b is formed as a semi-cylindrical shape that matches the shape of one side of the roller 9b. The roller 9b is inserted into the recess 53b in a direction orthogonal to the axis 9b1.

[0065] Anti-detachment portions 54a and 54b extending along the length direction are integrally formed on the first segment 41. The anti-detachment portions 54a and 54b engage with the corners of roller 9a and roller 9b to prevent rollers 9a and 9b from falling off along the axial direction.

[0066] Multiple hooks 56 are integrally formed in the rolling element holding part 51 of the first segment 41. The first segment 41 and the second segment 42 are combined by engaging the hooks 56 of the first segment 41 with the hooks 66 of the second segment 42.

[0067] A gear holding surface 52a is formed in the gear holding portion 52. The gear holding surface 52a is substantially inclined at 45 degrees with respect to the axis 9a1 of roller 9a and the axis 9b1 of roller 9b. The gear holding surface 52a and the side surface 13b1 of gear 13 (see reference) Figure 9 Opposite. A recess 52b is formed on the gear holding surface 52a to accommodate the shaft 13c of the gear 13. The recess 52b is hole-shaped and inclined relative to the gear holding surface 52a.

[0068] like Figure 12 As shown, in the second segment 42, the rolling element holding part 61 of the holding rollers 9a and 9b and the gear holding part 62 of the holding gear 13 are integrally formed.

[0069] The rolling element holding portion 61 of the second segment 42 has recesses 63a and 63b that receive portions of rollers 9a and 9b. Recesses 63a receive rollers 9a whose axis 9a1 faces upwards (see reference). Figure 9 The upper half of the roller 9a is formed as a short cylindrical shape that matches the shape of the upper half of the roller 9a. The roller 9a is inserted into the recess 63a along the axial direction.

[0070] The recess 63b accommodates one side (upper half) of the roller 9b with its axis 9b1 pointing downwards. The recess 63b is formed as a semi-cylindrical shape that matches the shape of one side of the roller 9b. The roller 9b is inserted into the recess 63b in a direction orthogonal to the axis 9b1. Anti-detachment portions 64a and 64b are integrally formed on the second segment 42.

[0071] In the gear holding portion 62 of the second segment 42, a gear holding surface 62a is formed opposite to the gear holding surface 52a of the first segment 41. The gear holding surface 62a is substantially inclined at 45 degrees with respect to the axis 9a1 of roller 9a and the axis 9b1 of roller 9b. The gear holding surface 62a and the side surface 13b2 of gear 13 (see reference) Figure 9 Opposite. A gear 13 is disposed between a gear retaining surface 52a and a gear retaining surface 62a. A recess for receiving a shaft 13c is formed in the gear retaining surface 62a.

[0072] Multiple hooks 66 are integrally formed in the rolling element holding part 61 of the second segment 42. The hooks 66 engage with the hooks 56.

[0073] The direct-drive guide device according to the second embodiment has the following effects.

[0074] If the first segment 41, which integrally forms the rolling element holding portions 51 and 61, and the gear holding portions 52 and 62, is combined with the second segment 42, the rollers 9a and 9b and the gear 13 can be held simultaneously. Therefore, the assembly of the direct-drive guide device is easy.

[0075] Furthermore, by combining the first segment 41 with the second segment 42 to hold the rollers 9a, 9b and the gear 13, the rollers 9a, 9b and the gear 13 can be reliably held.

[0076] Furthermore, since the rolling element holding parts 51 and 61 are integrally formed with the gear holding parts 52 and 62, the force can be reliably transmitted from the gear 13 to the rollers 9a and 9b.

[0077] The first dividing body 41 and the second dividing body 42 have rolling element holding portions 51 and 61 with recesses 53a and 63a for inserting one of the adjacent rollers 9a and 9b along its axial direction, and recesses 53b and 63b for inserting the other roller 9b in a direction orthogonal to its axis 9b1. Therefore, rollers 9a and 9b can be easily assembled in the first dividing body 41 and the second dividing body 42.

[0078] It should be noted that the present invention is not limited to the solutions embodied in the above embodiments, and can be embodied in other embodiments without changing the spirit of the present invention.

[0079] In the above embodiments, a cross roller is used as the rolling element, but a ball bearing or a parallel roller such as a needle roller can also be used as the rolling element.

[0080] It should be noted that the direct-drive guiding device of this embodiment can be assembled as an essential component in a wide range of fields, from industrial machinery such as machine tools, semiconductor and liquid crystal manufacturing equipment (e.g., assembly machines) and robots, to consumer applications such as system kitchens, various game consoles, medical equipment, food processing equipment, and handling equipment.

[0081] This specification is based on Japanese Patent Application No. 2021-012648, filed on January 29, 2021. Its entire contents are contained herein.

[0082] Explanation of reference numerals in the attached figures

[0083] 1: Direct-acting guide device; 2, 3: Guide rails; 2b, 3b: Meshing parts; 9, 9a, 9b: Cross rollers (rolling elements); 9a1, 9b1: Roller axis; 10, 40: Retainers; 11, 41: First dividing body; 12, 42: Second dividing body; 13: Gear; 14: Mating surface; 21, 31, 51, 61: Rolling element retaining parts; 22, 32, 52, 62: Gear retaining parts; 22a, 32a: Gear retaining surfaces; 23a, 23b, 33a, 33b, 53a, 53b, 63a, 63b: Recesses; C: Roller center; P: Plane.

Claims

1. A direct-acting guide device, comprising: Two guide rails, which are movable relative to each other along their length by means of at least one rolling element; and A retainer that holds the rolling element and a gear that engages with a meshing portion disposed on at least one of the two guide rails. in, The retainer includes: a first segment integrally formed with a rolling element retaining portion for retaining the rolling element and a gear retaining portion for retaining the gear; and a second segment integrally formed with the rolling element retaining portion for retaining the rolling element and the gear retaining portion for retaining the gear. The first segment and the second segment are combined with each other. A recess for accommodating the shaft of the gear is formed in the gear holding portion of the first segment. The gear holding portion of the second segment has a recessed portion formed to accommodate the shaft of the gear.

2. The direct-acting guide device according to claim 1, characterized in that, The rolling elements are intersecting rollers whose axes are perpendicular to each other. The axis of one of the adjacent rollers and the center of the other roller are arranged in a plane that is substantially the same as the mating surface of the first segment and the second segment.

3. The direct-acting guide device according to claim 2, characterized in that, The gear holding portion of the first segment and the second segment has a gear holding surface that is inclined relative to the mating surface.

4. The direct-acting guide device according to claim 1, characterized in that, The rolling elements are intersecting rollers whose axes are perpendicular to each other. The rolling element holding portion of the first segment and the second segment has a recess for inserting one of the adjacent rollers along the axial direction of that roller, and a recess for inserting the other of the adjacent rollers in a direction orthogonal to the axial direction of that other roller.

5. The direct-acting guide device according to any one of claims 1 to 4, characterized in that, The first segment and the second segment are fused together.

6. The direct-acting guide device according to any one of claims 1 to 4, characterized in that, The gear is disposed between the gear retaining surface of the first segment and the gear retaining surface of the second segment. The gear holding surface of the first segment has a first inclined surface and a second inclined surface that are inclined to each other, and the gear holding surface of the second segment has a first inclined surface and a second inclined surface that are inclined to each other, so as to allow the gear to oscillate.

Images