Feed mechanism

Abstract

The present invention provides a feeding mechanism that reliably suppresses backlash over a long period of time and has high reliability. The feeding mechanism (1) includes a base (2), a movable body (3), a feed screw (4) rotatably disposed on the movable body (3) or the base (2), a support member (20) fixed to the base (2) or the movable body (3) and provided with a first internal thread portion for threaded engagement with the feed screw (4), and an axial force generating member (30) having a second internal thread portion for threaded engagement with the feed screw (4) formed on one side. A force applying unit is provided between the first internal thread portion of the support member (20) and the second internal thread portion of the axial force generating member (30) to apply force to the axial force generating member (30) in the axial direction.

Description

Technical Field

[0001] This invention relates to a feeding mechanism that uses a feed screw to move a movable body relative to a base. Background Technology

[0002] Conventionally, in feed mechanisms that use a feed screw to move a movable body, there exists, for example, the technology described in Patent Document 1. This feed mechanism includes: a base; a movable body; a feed screw that moves the movable body relative to the base; and a torque generating member having an internal thread that engages with the feed screw. A receiving hole is formed in the base, extending in a direction orthogonal to the feed screw, and the torque generating member is received in the receiving hole.

[0003] The torque generating member has the function of absorbing the gap between the internal thread of the movable body and the feed screw. Therefore, it is configured such that if an axial force is applied to the movable body, the amount of elastic deformation gap of the torque generating member is adjusted.

[0004] Existing technical documents

[0005] Patent documents

[0006] Patent Document 1: Japanese Patent No. 7407165 Summary of the Invention

[0007] The problem the invention aims to solve

[0008] Furthermore, in the feed mechanism described in Patent Document 1, the torque generating member is made of an elastic body and has an internal thread that engages with the feed screw thread, configured to be replaceable when the torque generating function deteriorates due to wear over the years. Therefore, a problem exists: the torque generating member must be replaced whenever the torque generating function deteriorates and the backlash suppression effect decreases.

[0009] Therefore, the object of the present invention is to provide a feed mechanism that can reliably suppress backlash over a long period of time and has high reliability.

[0010] Solution for solving the problem

[0011] In order to solve this problem, the invention described in Technical Solution 1 is characterized in that it includes: a base; a movable body; a feed screw, which is rotatably provided on the movable body or the base; a support member, which is fixed to the base or the movable body and is provided with a first internal thread portion for threadedly engaging and inserting the feed screw; and an axial force generating member, which is formed with a second internal thread portion for threadedly engaging the feed screw on one side, and a biasing unit for axially biasing the axial force generating member is provided between the first internal thread portion of the support member and the second internal thread portion of the axial force generating member. The biasing unit is integrally provided on the front end side in the insertion direction of the feed screw into the axial force generating member. On the end face on the front end side in the insertion direction of the biasing unit, a plurality of pin through holes or protrusions are formed at a certain interval in the circumferential direction. On the support member, there are fixing pins that can penetrate through the plurality of pin through holes of the biasing unit, or recesses that can engage with the plurality of protrusions of the biasing unit. By penetrating the fixing pins through any of the pin through holes of the biasing unit, or engaging the recesses with any of the protrusions of the biasing unit, the axial force generating member is prevented from rotating relative to the support member, and it is configured to be able to adjust the axial force of the axial force generating member generated by the biasing unit.

[0012] In addition, for the invention described in Technical Solution 2, based on the structure described in Technical Solution 1, it is characterized in that the biasing unit is a rectangular spring (Japanese: 角ばね) formed in a spiral shape, and is configured such that the front end side in the insertion direction abuts against the end of the first internal thread portion.

[0013] For the invention described in Technical Solution 3, based on the structure described in Technical Solution 1, it is characterized in that a receiving through hole extending in the same direction as the axial direction of the feed screw is formed in the support member, and the axial force generating member is received in the receiving through hole.

[0014] Effects of the Invention

[0015] According to the invention described in Technical Solution 1, a biasing unit for axially biasing the axial force generating member is provided between the first internal thread portion of the support member and the second internal thread portion of the axial force generating member. Thus, when the feed screw is threadedly engaged with the first internal thread portion of the support member, by applying a compressive force to the biasing unit to cause its elastic deformation while screwing in, the axial force generating member is axially biased, thereby being able to suppress gaps for a long time and improve reliability.

[0016] Furthermore, according to the invention described in technical solution 1, since an anti-rotation unit is provided to prevent the axial force generating member from rotating relative to the support member, the rotational movement of the axial force generating member can be reliably prevented, thereby further improving the reliability of the feeding mechanism.

[0017] According to the invention described in technical solution 2, the force-applying unit is a rectangular spring formed in a spiral shape, configured such that the front end side in the insertion direction abuts against the end of the first internal thread portion, thereby improving reliability over a long period of time.

[0018] Furthermore, in the invention described in technical solution 3, a receiving through hole is formed in the support member extending in the same direction as the axial direction of the feed screw, and an axial force generating member is accommodated in the receiving through hole, thereby enabling miniaturization of the entire feed mechanism. Attached Figure Description

[0019] Figure 1 This is a perspective view showing one embodiment of the feeding mechanism of the present invention.

[0020] Figure 2 Observing from different directions Figure 1 A three-dimensional view of the feed mechanism.

[0021] Figure 3 It means Figure 1 A top view of the feed mechanism.

[0022] Figure 4 It means Figure 3 An enlarged top view of the supporting components, feed screw, and axial force generating components.

[0023] Figure 5 It means Figure 1 The main view of the feed mechanism.

[0024] Figure 6 yes Figure 3 A cross-sectional view along line AA.

[0025] Figure 7 It means Figure 4 An enlarged 3D view of the component that generates axial force.

[0026] Figure 8 It means Figure 6 An enlarged sectional view of the axial force generating component installed on the supporting component.

[0027] Figure 9 This is a perspective view showing a first modified example of the axial force generating member of an embodiment of the feeding mechanism of the present invention.

[0028] Figure 10This is a perspective view showing a second modified example of the axial force generating member of an embodiment of the feeding mechanism of the present invention.

[0029] Figure 11 This is a perspective view showing an application example of one embodiment of the feeding mechanism of the present invention.

[0030] Figure 12 It means Figure 11 A longitudinal sectional view of an application example.

[0031] Figure 13 It means Figure 11 An enlarged 3D view of a component that generates axial force in an application example.

[0032] Explanation of reference numerals in the attached figures

[0033] 1. Feed mechanism; 1A. Feed mechanism; 2. Base; 3. Movable body; 3A. Rotatable movable body; 4. Feed screw; 5. External threaded part; 6. Head; 7. Nut; 10. Connecting component; 11. Fixing plate; 12. Protruding plate; 13. Through hole; 20. Support component; 21. Fixing part; 22. Receiving part; 23. Receiving through hole; 24. Internal threaded part (first internal threaded part); 25. Pin through hole (anti-rotation unit); 26. Fixing pin (anti-rotation unit) 30. Axial force generating component; 30A. Axial force generating component; 30B. Axial force generating component; 30C. Axial force generating component; 32. Rectangular spring (force applying unit); 33. Pin through hole (anti-rotation unit); 34. Internal thread part (second internal thread part); 35. Wave spring (force applying unit); 36. Cylindrical part; 36a, 36b. Cylindrical part; 37. Cylindrical rubber (force applying unit); 38. External thread part; 39. Flange part; 40. Through hole. Detailed Implementation

[0034] Hereinafter, one embodiment of the feeding mechanism of the present invention will be described.

[0035] (One implementation of the feed mechanism)

[0036] Figure 1 This is a perspective view showing one embodiment of the feeding mechanism of the present invention. Figure 2 Observing from different directions Figure 1 A three-dimensional view of the feed mechanism. Figure 3 It means Figure 1 A top view of the feed mechanism. Figure 4 It means Figure 3 An enlarged top view of the supporting components, feed screw, and axial force generating components. Figure 5 It means Figure 1 The main view of the feed mechanism. Figure 6 yes Figure 3 A cross-sectional view along line AA.

[0037] like Figures 1-6 As shown, the feed mechanism 1 of this embodiment includes a base 2, a movable body 3, a feed screw 4, a connecting member 10, a support member 20, and an axial force generating member 30. The feed mechanism 1 is also referred to as a worktable device or a platform device, etc.

[0038] The base 2 is formed as a flat, quadrilateral plate when viewed from above. The planar shape of the base 2 is not particularly limited to quadrilateral and can be other shapes. The base 2 is mounted, for example, to a fixed-side member such as a frame (not shown), and has mounting holes (not shown) for fastening to the fixed-side member using bolts or other fastening components. The material of the base 2 is not particularly limited; for example, it can be made of metals such as aluminum, copper, brass, iron, nickel, magnesium, and tungsten, or polymer resins, which offer high rigidity and durability.

[0039] A guide mechanism (not shown) is mounted on the upper surface of the base 2 to guide the movable body 3 to move linearly relative to the base 2. This guide mechanism may use, for example, a cross roller guide or a linear guide; in this embodiment, a cross roller guide is used as an example. However, this embodiment is not particularly limited to these guide mechanisms.

[0040] Here, the aforementioned cross roller guide consists of two sets of guide rails, each consisting of multiple guide rollers, plate-shaped retainers for holding these guide rollers in a rotatable manner, and a pair of prism-shaped guide rails arranged in parallel to clamp these guide rollers and retainers.

[0041] The feed screw 4 is rotatably supported on one side of the movable body 3 by means of the connecting member 10. An external thread 5 is formed on the feed screw 4, extending approximately its entire axial length. The type of thread in this external thread 5 is not particularly limited; it can be a triangular thread or a trapezoidal thread. A head 6 is provided at one end of the feed screw 4 so that the feed screw 4 can be rotated using a tool such as a hex wrench or manually. In this case, in addition to a hex wrench, a screwdriver can also be used to rotate the feed screw 4, or it can be configured to be rotated automatically by a motor. The material of the feed screw 4 is not particularly limited; for example, a metal such as steel can be used.

[0042] The connecting member 10 is formed of an L-shaped metal piece when viewed from above, and includes a fixing plate 11 that is fixed to one side of the movable body 3 by a fastening member and a protruding plate 12 that protrudes vertically outward from the fixing plate 11. A circular through hole 13 is formed in the protruding plate 12, and the portion of the external threaded portion 5 located near the head 6 of the feed screw 4 rotatably passes through the through hole 13.

[0043] A nut 7 is threadedly engaged in the portion of the external threaded portion 5 near the head 6 of the feed screw 4. In this embodiment, after adjusting the position of the movable body 3 relative to the base 2 by rotating the feed screw 4, the nut 7 is moved relative to the threaded engagement position of the external threaded portion 5, and the nut 7 and the head 6 of the feed screw 4 are used to clamp the protruding piece 12, thereby reliably preventing the rotation of the feed screw 4.

[0044] The movable body 3 is formed into a flat plate with a quadrilateral shape when viewed from above, and the same dimensions as the base 2 in both the longitudinal and transverse directions. The material of the movable body 3 is not particularly limited, and can be, for example, metals such as aluminum, resin, etc. The movable body 3 is guided in linear motion by cross roller guides mounted on the upper surface of the base 2 as described above.

[0045] For example, a precision vise is provided on the movable body 3. Specifically, it is a tool used in the machine tool field for fixing raw materials during machining processes such as milling, drilling, and grinding. In addition to the precision vise, optical accessories are sometimes provided on the movable body 3. Specifically, it is a device or fixture / tool ​​used in optical technology for precisely positioning mirrors or lenses to control the optical axis of laser beams, etc. Furthermore, any component provided on the movable body 3 can be applied to any component as long as it is used for precision positioning.

[0046] Figure 7 It means Figure 4 An enlarged 3D view of the component that generates axial force. Figure 8 It means Figure 6 An enlarged sectional view of the axial force generating component installed on the supporting component.

[0047] On the base 2, a support member 20 is fixed to the same side as the side on which the connecting member 10 is fixed to the movable body 3. This support member 20 integrally forms a fixing portion 21 that is fixed to one side of the base 2 by a fastening member, and a receiving portion 22 that protrudes outward from the fixing portion 21. Figure 6 and Figure 8 As shown, a through-hole 23 is formed inside the receiving portion 22, extending in the same direction as the axial direction of the feed screw 4. The through-hole 23 has a circular cross-section and is formed to pass through the length of the receiving portion 22.

[0048] like Figure 8 As shown, an internal thread portion (first internal thread portion) 24 is formed at the insertion front end of the feed screw 4 inserted into the through hole 23, for threading with the external thread portion 5 of the feed screw 4. The type of this internal thread portion 24 is not particularly limited, and it can be a triangular thread, trapezoidal thread, etc., similar to the feed screw 4.

[0049] In addition, such as Figure 1 and Figure 4 As shown, the support member 20 is configured such that an elongated pin through hole 25 is provided on the upper side of the front end of the insertion side into which the feed screw 4 is inserted, and an elongated fixing pin 26 passes through the pin through hole 25.

[0050] Furthermore, the front end of the axial force generating member 30 is inserted into the receiving through hole 23 until it abuts against the end of the internal thread portion 24. The material of the axial force generating member 30 is the same as that of the base 2, and is not particularly limited. For example, it can be made of metals such as aluminum, copper, brass, iron, nickel, magnesium, and tungsten, or polymer resins, which are materials with high rigidity and durability.

[0051] The outer diameter of the axial force generating component 30 is larger than the diameter of the external thread portion 5 of the feed screw 4 and smaller than the diameter of the through hole 23. For example... Figure 4 and Figure 7 As shown, the axial force generating member 30 has a rectangular spring 32, which is helical and serves as a force-applying unit, provided at its axial center. The axial force generating member 30 has four pin through holes 33 formed at certain intervals (90 degrees in this embodiment) on its front end face in the insertion direction.

[0052] The axial force generating member 30 has an internal thread (second internal thread) 34 formed on its inner circumferential surface at the rear end in the insertion direction. However, the internal thread 34 is not formed on the portion of the rectangular spring 32. Thus, the axial force generating member 30 is configured to elastically deform in the axial direction using the rectangular spring 32.

[0053] Next, the function of the feed mechanism 1 in this embodiment will be explained.

[0054] First, the nut 7 is threaded into the external thread 5 of the feed screw 4. Then, the axial force generating member 30 is threaded into the external thread 5 of the feed screw 4. After that, in this state, the axial force generating member 30 is accommodated in the receiving through hole 23 until the front end of the axial force generating member 30 abuts against the internal thread 24 of the support member 20.

[0055] At this time, the rectangular spring 32 of the axial force generating component 30 contracts axially in the receiving through hole 23 of the support component 20, and while applying appropriate pressure, the external thread 5 of the feed screw 4 is screwed into the internal thread 24 of the support component 20, thereby causing the rectangular spring 32 to elastically deform, thus... Figure 8 As shown, an axial force F can be continuously generated between the internal thread portion 24 of the support member 20 and the internal thread portion 34 of the axial force generating member 30.

[0056] Next, the pin through hole 25 of the support member 20 is aligned circumferentially with any one of the four pin through holes 33 on the insertion side front end face of the axial force generating member 30. That is, the alignment is performed such that the pin through hole 33 of the axial force generating member 30 communicates with the pin through hole 25 of the support member 20, and the fixing pin 26 is continuously passed through these pin through holes 25, 33, thereby reliably preventing movement of the axial force generating member 30 in the rotational direction.

[0057] like Figure 8 As shown, the internal thread portion 24 of the support member 20 and the internal thread portion 34 of the axial force generating member 30 are pressed against the threads of the external thread portion 5 of the feed screw 4 by the force of the rectangular spring 32, thus achieving a tight fit without gaps. Specifically, when the feed screw 4 is rotated relative to the internal thread portion 24 of the support member 20 and the internal thread portion 34 of the axial force generating member 30, the rectangular spring 32 of the axial force generating member 30 continuously generates an axial force F that resists the rotation of the feed screw 4.

[0058] Therefore, in this embodiment, when the feed screw 4 is rotated manually, the axial force generating member 30 prevents the feed screw 4 from wobbling and allows for smooth screwing, enabling the feed screw 4 to be fed with high precision. As a result, after adjusting the position of the movable body 3, it is possible to prevent the movable body 3 from moving prematurely.

[0059] The axial force generating member 30 prevents clearance between the internal thread portions 24, 34 and the external thread portion 5 of the feed screw 4. That is, the axial force generating member 30 has the function of preventing the movable body 3 from wobbling due to clearance. The position of the movable body 3 is determined by the internal thread portion 34, which is in close contact with the feed screw 4 without clearance.

[0060] Thus, according to this embodiment, a rectangular spring 32 is provided between the internal thread portion 24 of the support member 20 and the internal thread portion 34 of the axial force generating member 30 to apply axial force to the axial force generating member 30. Therefore, when the feed screw 4 is threadedly engaged with the internal thread portion 24 of the support member 20, the axial force generating member 30 is applied axially by screwing in while applying a compressive force to the rectangular spring 32, thereby suppressing backlash for a long time and improving reliability.

[0061] Furthermore, according to this embodiment, the rectangular spring 32 is configured to be integrated with the axial force generating member 30, forming a spiral shape and having its front end abutting against the end of the internal thread portion 24, thereby improving reliability over a long period of time.

[0062] Furthermore, according to this embodiment, as an anti-rotation unit that prevents the axial force generating member 30 from rotating relative to the support member 20, a fixing pin 26 is provided that passes through the pin through hole 25 in the support member 20 and the pin through hole 33 in the axial force generating member 30. Therefore, it can reliably prevent the movement of the axial force generating member 30 in the rotational direction and improve the gap suppression effect.

[0063] Furthermore, according to this embodiment, a receiving through hole 23 is formed in the support member 20, extending in the same direction as the axial direction of the feed screw 4, and the axial force generating member 30 is accommodated in the receiving through hole 23, thereby enabling miniaturization of the feed mechanism 1 as a whole.

[0064] (First deformation example of a component caused by axial force)

[0065] Figure 9 This is a perspective view showing a first modified example of the axial force generating member according to an embodiment of the feeding mechanism of the present invention. Furthermore, in this modified example, the same reference numerals are used to describe parts that are the same as or correspond to those in the above embodiment. Other modified examples and application examples are similarly described.

[0066] like Figure 9 As shown, in this modified example, the axial force generating member 30A uses a wave spring 35 as the force-applying unit instead of the rectangular spring 32 in the above embodiment. The wave spring 35 is formed with a lower height in the extension direction, i.e., as the spring, and is formed by winding a plate-shaped steel wire into a spiral or ring shape and applying a wave. Although the wave spring 35 has the same elastic force as the conventional circular coil spring, it can achieve space saving and weight reduction, and can also be used for vibration absorption applications.

[0067] In the wave spring 35, pin through holes 33 are formed on both sides of the axial direction as an anti-rotation unit for a fixing pin (not shown) to pass through. These pin through holes 33 are arranged at 90-degree intervals in the circumferential direction, similar to those in the above embodiment.

[0068] Similar to the embodiment described above, the axial force generating member 30A has an internally threaded portion (second internally threaded portion) 34 formed on the inner circumferential surface of the cylindrical portion 36, which is located at the rear end in the insertion direction. The cylindrical portion 36 and the wave spring 35 are continuously disposed together. The cylindrical portion 36 is made of a material with high rigidity and durability, such as metals like aluminum, copper, brass, iron, nickel, magnesium, and tungsten, or polymer resins. The cylindrical portion 36 and the wave spring 35 can also be fixed using a fixing pin (not shown) or by using adhesive. In this way, the axial force generating member 30A is configured to be elastically deformable in the axial direction by means of the wave spring 35.

[0069] Thus, according to this modified example, by using the wave spring 35 as the force-applying unit, the same load force as the coil spring can be obtained within a small span, thereby allowing the force-applying component to be accommodated in a small space. This suppresses the enlargement of the axial force-generating component 30A and also reduces costs.

[0070] Furthermore, in this modified example, an example with a pin-through hole 33 for a fixing pin to pass through was described as an anti-rotation unit, but it is not limited to this. For example, it can also function as an anti-rotation unit by using an adhesive for fixing. Other structures and functions are the same as in the above embodiment, so their description is omitted.

[0071] (Second deformation example of a component caused by axial force)

[0072] Figure 10 This is a perspective view showing a second modified example of the axial force generating member of an embodiment of the feeding mechanism of the present invention.

[0073] like Figure 10 As shown, in this modified example, the axial force generating member 30B is provided with a cylindrical rubber 37 as a force-applying unit instead of the rectangular spring 32 in the above embodiment. This cylindrical rubber 37 is fixed between the left and right cylindrical portions 36a and 36b. The cylindrical rubber 37 and the left and right cylindrical portions 36a and 36b can be fixed to prevent rotation using a fixing pin and a pin through hole, as in the first modified example, or they can be fixed using adhesive.

[0074] The left and right cylindrical portions 36a and 36b can also be made of the same material as the cylindrical portion 36 in the first modification. Furthermore, in this modification, the axial force generating member 30B has an internal thread portion 34 formed on the inner circumferential surface of the cylindrical portion 36b, serving as a second internal thread portion. The left and right cylindrical portions 36a and 36b are axially connected to the cylindrical rubber 37, allowing the external thread portion 5 to pass through. Thus, the axial force generating member 30B is configured to be able to elastically deform in the axial direction using the cylindrical rubber 37.

[0075] Therefore, according to this modified example, by using the cylindrical rubber 37 as the force-applying unit, the cylindrical rubber 37 can be easily installed, thereby reducing costs. Other structures and functions are the same as in the above-described embodiment, and therefore their description is omitted.

[0076] (Application example of a feed mechanism)

[0077] Figure 11 This is a perspective view showing an application example of one embodiment of the feeding mechanism of the present invention. Figure 12 It means Figure 11 A longitudinal sectional view of an application example. Figure 13 It means Figure 11An enlarged perspective view of the axial force generating component in this application example. This application example is used in optical accessories, and more specifically, in an angle adjustment mechanism for a lens retainer.

[0078] like Figure 11 As shown, the feed mechanisms 1A in this application example are respectively provided at the upper and lower corners of the base 2. These feed mechanisms 1A are respectively provided in the receiving through holes 23 of the support member 20 of the base 2. At the front end of the feed screw 4 of the feed mechanism 1A, a rotatable movable body 3A is mounted with the means of connection 8 so that its angle can be adjusted relative to the base 2. The angle of the rotatable movable body 3A is adjusted with the pivot point 41 of the rotating part as the center.

[0079] An internal thread 24 is formed on the rear end side of the feed screw 4 in the insertion direction of the receiving through hole 23 of the support member 20. The external thread 38 of the axial force generating member 30C is threadedly engaged with the internal thread 24, thereby fixing the axial force generating member 30C to the receiving through hole 23 of the support member 20.

[0080] like Figure 12 and Figure 13 As shown, the axial force generating component 30C is integrally formed, and a flange portion 39 is continuously formed with the external thread portion 38. A rectangular spring 32, serving as a force-applying unit, is sequentially formed with the flange portion 39.

[0081] The axial force generating member 30C has a through hole 40 formed along its axis in an axially connected manner for the feed screw 4 to pass through. Within this through hole 40, an internal thread portion (first internal thread portion) 42 is formed at the location where the external thread portion 38 is formed, and an internal thread portion (second internal thread portion) 43 is formed at the location where the rectangular spring 32 is formed. No internal thread portions are formed between these internal thread portions 42 and 43. That is, no internal thread portion is formed in the portion of the through hole 40 where the flange portion 39 is formed.

[0082] Next, the function of the feed mechanism 1A in this application example will be explained.

[0083] First, the axial force generating member 30C is threaded onto the external thread portion 5 of the feed screw 4 up to near the head 6. Then, the external thread portion 38 of the axial force generating member 30C is threaded onto the internal thread portion 24 of the support member 20. Next, the rotatable body 3A is connected to the front end of the external thread portion 5 of the feed screw 4 via the connecting portion 8.

[0084] Then, the head 6 of the feed screw 4 is rotated to screw the external thread 5 into the internal thread 42 until the front surface of the flange 39 abuts against the opening end face of the receiving through hole 23 of the support member 20. At this time, the external thread 5 of the feed screw 4 is screwed into the internal thread 43 of the axial force generating member 30C while applying appropriate pressure by causing the rectangular spring 32 of the axial force generating member 30C to contract axially. This causes the rectangular spring 32 to elastically deform, thereby enabling the axial force F to be continuously generated between the internal thread 42 and the internal thread 43 of the axial force generating member 30C.

[0085] The internal thread portions 42 and 43 of the axial force generating member 30C are pressed against the threads of the external thread portion 5 of the feed screw 4 by the force of the rectangular spring 32, thus achieving a tight fit without gap. Specifically, when the feed screw 4 rotates relative to the internal thread portions 42 and 43 of the axial force generating member 30C, the rectangular spring 32 of the axial force generating member 30C continuously generates an axial force F that resists the rotation of the feed screw 4.

[0086] Therefore, in this embodiment, when the feed screw 4 is rotated manually, the axial force generating member 30C can be used to prevent the feed screw 4 from wobbling, and it can be smoothly screwed in, enabling the feed screw 4 to be fed with high precision. As a result, after adjusting the position of the rotating movable body 3A, it is possible to prevent the rotating movable body 3A from moving unintentionally. Other structures and functions are the same as in the above embodiment, so their description is omitted.

[0087] [Other embodiments of the invention]

[0088] Embodiments of the present invention have been described, but these embodiments are provided as examples and are not intended to limit the scope of the invention. These embodiments can be implemented in a variety of other ways, and various omissions, substitutions, modifications, and combinations can be made without departing from the spirit of the invention. These embodiments and their variations are included within the scope and spirit of the invention, and similarly, within the scope of the invention as described in the claims and its equivalents.

[0089] For example, in the above embodiment, an example of using a rectangular spring 32 as a force-applying unit was described, but of course, a circular spring could also be used, and multiple force-applying units such as helical springs and leaf springs could be arranged circumferentially between the cylindrical portion having a pin through hole 33 and the cylindrical portion having an internal thread portion 34.

[0090] Furthermore, in the above embodiment, as an anti-rotation unit that prevents the axial force generating member 30 from rotating relative to the support member 20, the fixing pin 26 is provided to pass through the pin through hole 25 of the support member 20 and the pin through hole 33 of the axial force generating member 30 to prevent rotation. However, it is not limited to this. For example, a recess may be formed on the abutting surface of the support member 20 where the axial force generating member 30 abuts, and a protrusion embedded in the recess may be formed on the axial force generating member 30.

[0091] Furthermore, in the above embodiment, an example was described in which the longitudinal and transverse dimensions of the movable body 3 are the same as those of the base 2. However, it is not limited to this, and the movable body 3 and the base 2 may also be formed with different longitudinal and transverse dimensions.

[0092] Furthermore, in the above embodiment, an example was described in which a feed screw 4 is provided on the movable body 3 via the connecting member 10, and a support member 20 is fixed on the base 2. However, it is also possible to do the opposite, with the feed screw 4 provided on the base 2 via the connecting member 10, and the support member 20 fixed on the movable body 3. Even with this configuration, the same effect as the above embodiment can be obtained.

Claims

1. A feeding mechanism, characterized in that, This feeding mechanism has the following features: Base; Movable body; The feed screw is rotatably mounted on the movable body or the base; A support member, fixed to the base or the movable body, is provided with a first internal thread for threaded engagement and insertion of the feed screw; and The axial force generating component has a second internal thread on one side for threaded engagement with the feed screw. A force-applying unit is provided between the first internal thread portion of the support member and the second internal thread portion of the axial force generating member to apply axial force to the axial force generating member. The force-applying unit is integrally provided on the front end side of the feed screw in the insertion direction of the axial force generating component. The end face of the front end of the force-applying unit in the insertion direction has multiple pin through holes or protrusions formed at certain intervals in the circumferential direction. The supporting member is provided with a fixing pin that can pass through the plurality of pin through holes of the force-applying unit, or it is formed with a recess that can engage with the plurality of protrusions of the force-applying unit. By inserting the fixing pin through any one of the plurality of pin through holes of the force-applying unit, or by engaging the recess with any one of the plurality of protrusions of the force-applying unit, the axial force generating member is prevented from rotating relative to the support member, and is configured to adjust the axial force of the axial force generating member generated by the force-applying unit.

2. The feeding mechanism according to claim 1, characterized in that, The force-applying unit is a rectangular spring formed in a spiral shape, configured such that the front end of the spring abuts against the end of the first internal thread portion in the insertion direction.

3. The feeding mechanism according to claim 1, characterized in that, The support member has a receiving through hole extending in the same direction as the axial direction of the feed screw, and the axial force generating member is received in the receiving through hole.

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