Position adjustment mechanism, adjustment tool used therefor, and position adjustment method

Abstract

To provide a position adjusting mechanism and an adjusting tool for a position adjusting object part.SOLUTION: The position adjustment mechanism has a hollow cylindrical part as a shaft part, and includes a hollow bolt screwed with an inner peripheral screw part of the position adjustment object part, a nut screwed with the hollow bolt, and a fixing screw inserted into the hollow cylindrical part and screwed with the base part. The hollow cylindrical part is provided with a clearance allowing the position adjustment object part screwed with the hollow bolt to move between the hollow cylindrical part and the screw part of the fixing screw. The adjustment tool includes a first socket member into which a tool for a fixing screw is inserted and which has a first columnar portion including a fitting portion for a hollow bolt, and a second socket member into which the first columnar portion is inserted, which is relatively rotatable coaxially with the first columnar portion, and which has a second fitting portion including a fitting portion for a nut.SELECTED DRAWING: Figure 9

Description

[Technical Field]

[0001] The present invention relates to a position adjustment mechanism, an adjustment tool used therefor, and a position adjustment method. [Background technology]

[0002] Conventionally, devices have been known that include a position adjustment target part whose position relative to a base part is required. For example, Patent Document 1 discloses a rotary encoder including a rotary scale having a scale pattern and a group of detection heads arranged opposite the rotary scale. The rotary scale is sometimes referred to as a rotor. The group of detection heads may be provided on a stator. For the rotary encoder to perform accurate measurements, the relative positions of the rotor and stator arranged opposite each other must be adjusted. The stator may be attached to the device body to which the rotary encoder is attached. In this case, the device body corresponds to the base part, and the stator corresponds to the position adjustment target part. The stator is required to be fixed to the device body or be adjustable in position. In this case, if a position adjustment mechanism that can switch the stator between a fixed state and an adjustable state and further adjust the position of the target part can be used, the position adjustment process would be easier.

[0003] Incidentally, conventionally, there are known tools that are designed to operate multiple fasteners (see, for example, Patent Document 2). Since the position adjustment mechanism described above also has multiple functions, it is expected that it will be equipped with multiple fasteners such as screws and bolts. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] International Publication No. 2023 / 054613 [Patent Document 2] Jippan No. 63-74278 Summary of the Invention [Problem to be solved by the invention]

[0005] As described above, there are other devices besides rotary encoders that can be easily adjusted by using a position adjustment mechanism with multiple functions. It is desirable that such position adjustment be as easy as possible.

[0006] Furthermore, although the tool disclosed in Patent Document 2 is designed to operate a plurality of fixing devices, it can only adjust the adjustment target in one direction and is therefore considered to lack versatility.

[0007] In one aspect, the present invention aims to provide a position adjustment mechanism capable of adjusting the position of a position adjustment target part relative to a base part, and an adjustment tool used therefor. [Means for solving the problem]

[0008] In one aspect, the position adjustment mechanism is a position adjustment mechanism that adjusts the position of a position adjustment target part relative to a base part, and includes a hollow tubular shaft part, a hollow bolt having an outer threaded part on the outer surface of the shaft part that threads with an inner threaded part provided in a mounting hole of the position adjustment target part, a nut that threads with the outer threaded part, and a fixing screw that is inserted into the hollow tubular part and threaded with the base part, and the diameter of the inner surface of the hollow tubular part is set to a dimension that forms a gap between the hollow tubular part and the threaded part of the fixing screw, allowing the position adjustment target part threaded with the hollow bolt to move in a direction perpendicular to the axial direction of the fixing screw.

[0009] In the position adjustment mechanism having the above configuration, the dimension across flats of the hollow nut may be equal to or greater than the dimension across flats of the head of the hollow bolt.

[0010] The position adjustment mechanism having the above-described configuration may be configured in a mode further including a pressurizing mechanism that biases the hollow bolt toward the base portion.

[0011] The pressure applying mechanism may include a spring member disposed between the head of the fixing screw and the head of the hollow bolt.

[0012] The spring member may be a spring washer through which the threaded portion of the fixing screw is inserted.

[0013] In another aspect, the adjustment tool is an adjustment tool that operates a position adjustment mechanism including: a hollow bolt having an outer threaded portion on the outer surface of a hollow tubular portion that screws into an inner threaded portion provided in a mounting hole of a position adjustment target portion that is adjustable in position relative to a base portion; a nut threaded onto the outer threaded portion; and a fixing screw that is inserted into the hollow tubular portion and screwed onto the base portion, and adjusts the position of the position adjustment target portion relative to the base portion, and includes: a first socket member having a first columnar portion at its tip end that has a first fitting portion with which the head of the hollow bolt fits; and a second socket member into which the first columnar portion is inserted from the base end side and is rotatable relative to the first columnar portion coaxially, and has a second columnar portion at its tip end that has a second fitting portion with which the nut fits; and the first columnar portion can be configured in an aspect where it has a through hole through which a tool that rotates the fixing screw is inserted from the base end side.

[0014] In the adjustment tool configured as described above, the second socket member may include a handle portion extending in a direction perpendicular to the axial direction of the second columnar portion.

[0015] In the adjustment tool having the above configuration, the second socket member may have a tool fitting portion into which a tool other than the first socket member is fitted.

[0016] In another aspect, a position adjustment method can be a method of adjusting the position of the position adjustment target part relative to the base part using the adjustment tool of the above aspect, and can include the steps of rotating the second socket member having the nut fitted into the second fitting part, and inserting a tool that rotates the fixing screw into the through hole of the first columnar part to loosen the fixing screw with the tool, thereby making the hollow bolt rotatable; rotating the first socket member having the head of the hollow bolt fitted into the first fitting part to adjust the distance of the position adjustment target part relative to the base part; moving the position adjustment target part in a plane parallel to the base part with the fixing screw loosened; tightening the nut to fix the distance of the position adjustment target part relative to the base part; and tightening the fixing screw to fix the position adjustment target part in a plane parallel to the base part.

[0017] In the position adjustment method having the above configuration, the step of moving the position adjustment target part in a plane parallel to the base part while the fixing screw is loosened can be performed while a pressure mechanism is used to bias the hollow bolt toward the base part. [Effects of the Invention]

[0018] A position adjustment mechanism capable of adjusting the position of a position adjustment target part relative to a base part, and an adjustment tool used therefor are provided. [Brief explanation of the drawings]

[0019] [Figure 1]Fig. 1(A) is a side view schematically showing a state before a stator using the position adjustment mechanism of the embodiment is mounted on a base portion. Fig. 1(B) is a side view schematically showing a state in which a stator using the position adjustment mechanism of the embodiment is mounted on a base portion and a rotor is mounted on a rotating shaft member. Fig. 1(C) is a side view schematically showing a state in which the stator and base portion shown in Fig. 1(A) are upside down and reversed. Fig. 1(D) is a side view schematically showing a state in which the stator shown in Fig. 1(C) is mounted on a base portion and a rotor is mounted on a rotating shaft member. [Figure 2] FIG. 2 is a plan view schematically showing a state in which a stator in which the position adjustment mechanism of the embodiment is used is mounted on a base portion, and a rotor is mounted on a rotary shaft member. [Figure 3] 3A and 3B are exploded side views of the position adjustment mechanism according to the embodiment. [Figure 4] FIG. 4 is a cross-sectional view taken along line AA in FIG. [Figure 5] Fig. 5(A) is a perspective view of the adjusting tool of the embodiment separated into a first socket member and a second socket member, and Fig. 5(B) is a perspective view of the adjusting tool of the embodiment and a hexagonal wrench. [Figure 6] 6A and 6B are three-sided views of the first socket member, with FIG. 6A being a front view, FIG. 6B being a plan view, and FIG. 6C being a bottom view. [Figure 7] 7A and 7B are four-sided views of the second socket member, with FIG. 7A being a front view, FIG. 7B being a plan view, FIG. 7C being a side view, and FIG. 7D being a bottom view. [Figure 8] Fig. 8(A) is a cross-sectional view of the adjustment tool of the embodiment separated into a first socket member and a second socket member, and Fig. 8(B) is a cross-sectional view of the adjustment tool of the embodiment and a view showing a hexagonal wrench. [Figure 9] FIG. 9 is a cross-sectional view of the adjusting tool of the embodiment attached to the position adjusting mechanism of the embodiment. [Figure 10] FIG. 10 is a cross-sectional view showing, in time sequence, how each part of the position adjustment mechanism moves when the adjustment tool of the embodiment is used. [Figure 11] FIG. 11 is a side view of a position adjustment mechanism in which the opposite side dimension of the nut and the opposite side dimension of the hollow bolt are made to match. [Figure 12] FIG. 12 is a cross-sectional view of an adjustment tool in which the inner diameter of the first fitting portion of the first socket member and the inner diameter of the second fitting portion of the second socket member are made to coincide with each other. [Figure 13] Fig. 13(A) is a cross-sectional view showing a state in which the nut and the second fitting portion are disengaged from each other, and Fig. 13(B) is a cross-sectional view showing a state in which the nut, which has risen to its upper limit position, is disengaged from the second fitting portion. [Figure 14] Fig. 14(A) is a perspective view of a second socket member in which the tool fitting portion formed on the second columnar portion is hexagonal, and Fig. 14(B) is a perspective view of a second socket member in which the tool fitting portion is formed on the top surface. [Figure 15] Fig. 15(A) is a perspective view of an adjustment tool equipped with a retaining mechanism, Fig. 15(B) is a cross-sectional view showing a state in which the first socket member is lifted relative to the second socket member, and Fig. 15(C) is a cross-sectional view showing a state in which the first socket member is pressed down relative to the second socket member. DETAILED DESCRIPTION OF THE INVENTION

[0020] Hereinafter, embodiments will be described with reference to the drawings.

[0021] (Embodiment) [Rotary Encoder] First, with reference to FIGS. 1A to 1D and 2, a rotary encoder 1 including a stator 5 whose position is adjusted by a position adjustment mechanism 10 according to this embodiment will be described. The rotary encoder 1 is mounted, for example, on various devices having rotating parts. These devices include a base 100, which serves as the device body, and a rotating shaft member 101 rotatably mounted relative to the base 100. The stator 5 is an example of a part whose position is adjusted by the position adjustment mechanism 10. The rotary encoder 1 includes a rotor 2 and a stator 5. The rotor 2 includes a scale pattern (not shown) and is sometimes referred to as a rotary scale. The rotor 2 is a disk-shaped member with a fitting hole 2a in its center. The rotor 2 is attached to the rotating shaft member 101 by fitting the fitting hole 2a into the rotating shaft member 101 so that its central axis coincides with the rotation axis AX1 of the rotating shaft member 101. The stator 5 includes a transmitter / receiver that transmits and receives signals to and from the scale pattern. The stator 5 is attached to the base portion 100. At this time, the rotor 2 and the stator 5 are required to be installed parallel to each other without any eccentricity.

[0022] Therefore, in this embodiment, the position of the stator 5 can be adjusted by the position adjustment mechanism 10, and the stator 5 can be installed parallel to the rotor 2 and at an arbitrary distance without being eccentric. In other words, by using the position adjustment mechanism 10 of this embodiment, the inclination between the rotor 2 and the stator 5 can be adjusted to make them parallel, and the distance between the rotor 2 and the stator 5 can be adjusted. Furthermore, by using the position adjustment mechanism 10, eccentricity adjustment of the stator 5 with respect to the rotation axis AX1 can be easily performed.

[0023] The base portion 100, the stator 5, and the rotor 2 are arranged in a stacked state along the Z direction. As shown in FIGS. 1(A) and 1(B), the base portion 100, the stator 5, and the rotor 2 may be arranged in this order from the bottom up: base portion 100, stator 5, and rotor 2. Alternatively, the top-bottom arrangement may be reversed, and as shown in FIGS. 1(C) and 1(D), the rotor 2, the stator 5, and the base portion 100 may be arranged in this order from the bottom up. Note that the following description will focus on the embodiment shown in FIGS. 1(A) and 1(B).

[0024] The position adjustment mechanisms 10 are arranged at equal intervals of 120° around the stator 5. The stator 5 is attached to the base part 100 by screwing the position adjustment mechanisms 10 into screw holes 100a provided in the base part 100.

[0025] Each position adjustment mechanism 10 can move the point on the stator 5 where the position adjustment mechanism 10 is located up and down in the Z-axis direction, as indicated by arrow 8a in Figure 1(B). By fixing the multiple position adjustment mechanisms 10 at different positions in the Z-axis direction, the stator 5 can be placed parallel to the rotor 2 and at any distance.

[0026] Each position adjustment mechanism 10 can move the stator 5 relative to the central axis AX2 of the screw hole 100a by loosening the fixing screw 17. Therefore, each position adjustment mechanism 10 can move the stator 5 along the X-axis direction as shown by arrow 8b in FIG. 2, or along the Y-axis direction as shown by arrow 8c. This allows the stator 5 to be installed without being eccentric with respect to the rotor 2. Furthermore, if the fixing screw is loosened to a distance at which pressure is applied by the pressure mechanism 20 (see FIGS. 3(A) and 3(B)), it becomes easy to finely adjust the movement of the stator 5, making it easy to accurately align the eccentricity with respect to the rotor 2.

[0027] In the following description, one side in the Z-axis direction will be referred to as the base end side, and the other side as the tip end side, as shown in FIG. 1(B).

[0028] [Position adjustment mechanism] Next, the configuration of the position adjustment mechanism 10 will be described in detail with reference to Figures 3(A), 3(B), and 4. The position adjustment mechanism 10 includes a hollow bolt 12, a fixing screw 17, and a nut 22. The position adjustment mechanism 10 also includes a pressurizing mechanism 20.

[0029] The hollow bolt 12 has a head 13 on the base end side that is hexagonal in plan view. However, the shape of the head 13 is not limited to hexagonal, and various conventionally known shapes can be used. A hollow tubular portion 14, which corresponds to the shaft portion of the hollow bolt 12 and extends toward the tip side, is connected to the head 13. The hollow tubular portion 14 has an inner circumferential surface 14a with an inner diameter r14a. The inner diameter r14a is the diameter of the inner circumferential surface 14a of the hollow tubular portion 14. An outer circumferential thread portion 15a is formed on the outer circumferential surface 15 of the hollow tubular portion 14. In other words, the hollow bolt 12 is a male thread. An inner circumferential thread portion (female thread portion) 7 provided in a mounting hole 6 of the stator 5 is threadedly engaged with the outer circumferential thread portion 15a. As the hollow bolt 12 rotates, the stator 5 can move up and down along the Z-axis direction according to the direction of rotation, and the distance between the stator 5 and the base part 100, that is, the position in the height direction (Z-axis direction), is adjusted. As a result, the distance between the rotor 2 and the stator 5 is adjusted.

[0030] The fixing screw 17 has a head 18 provided on the base end side. A tool hole 18a is provided in the head 18. In this embodiment, the tool hole 18a is a hexagonal hole and can be rotated using a hexagonal wrench (see FIG. 8(B) etc.). The tool hole 18a may have another shape, and may be any of various conventionally known shapes. The tool hole 18a may be, for example, a + (plus) or - (minus) shape. A rod-shaped threaded portion 19 extending toward the tip side is connected to the head 18 and has an outer diameter R19. The threaded portion 19 is screwed into a threaded hole 100a provided in the base portion 100. The fixing screw 17 can fix the stator 5 to the base portion 100.

[0031] The outer diameter R19 of the threaded portion 19 is smaller than the inner diameter r14a of the inner circumferential surface 14a of the hollow cylindrical portion 14. By making the outer diameter R19 smaller than the inner diameter r14a, a gap is formed between the inner circumferential surface 14a and the threaded portion 19. As a result, when the fixing screw 17 is loosened, the hollow bolt 12 can move in the X direction and the Y direction relative to the threaded portion 19. Because the stator 5 is attached to the hollow bolt 12, the stator 5 can move in the X direction and the Y direction relative to the threaded portion 19. In other words, the stator 5 can move in the X direction and the Y direction relative to the central axis AX2 of the screw hole 100a into which the threaded portion 19 is threaded, thereby eliminating eccentricity of the stator 5 with respect to the rotor 2. In this way, the position of the stator 5 can be adjusted within a plane parallel to the base portion 100 (the XY plane).

[0032] In order for the hollow bolt 12 to be rotatable, the fixing screw 17 and the nut 22 must be loosened. By loosening the fixing screw 17 and the nut 22 and rotating the hollow bolt 12, the stator 5 can be moved up and down as described above.

[0033] The nut 22 is threaded onto the outer peripheral thread portion 15a of the hollow bolt 12. The nut 22 is disposed above the stator 5, which is threaded onto the outer peripheral thread portion 15a of the hollow bolt 12, in the Z direction. In other words, the nut 22 is disposed between the stator 5 and the head 13 of the hollow bolt 12. In this embodiment, the dimensions of the nut 22, specifically the face-to-face dimension, which is the distance between opposing sides (faces), are larger than the face-to-face dimension of the head 13 of the hollow bolt 12. The outer shape of the nut 22 in this embodiment is hexagonal, but the outer shape of the nut 22 is not limited to a hexagon and various conventional shapes can be used. Furthermore, in this specification, the face-to-face dimensions are compared when comparing the sizes of nuts and bolts. However, the face-to-face dimensions may be replaced with the diagonal dimension, which is the distance between opposing corners. In short, any dimension that can be used to compare the sizes of nuts and bolts can be used. The stator 5 has an inner peripheral thread portion 7, and the stator 5 itself has a structure similar to that of a nut. Therefore, the nut 22 can obtain a so-called double nut effect together with the stator 5. Therefore, when the nut 22 is tightened and fastened to the stator 5, it is possible to stop the rotation of the hollow bolt 12 and maintain the position of the stator 5 in the Z direction.

[0034] In the position adjustment mechanism 10, the nut 22 is located closer to the tip than the head 13 of the hollow bolt 12. As will be described in detail later, the second fitting portion 38 fits into the nut 22. As will be described in detail later, the first fitting portion 33 fits into the head 13. The first columnar portion 32 on which the first fitting portion 33 is provided and the second columnar portion 37 on which the second fitting portion 38 is provided are coaxially arranged, but the first columnar portion 32 is arranged inside the second columnar portion 37. Therefore, by making the dimension across sides of the nut 22 larger than the dimension across sides of the head 13 of the hollow bolt 12, it is possible to easily fit the nut 22 into the second fitting portion 38 and fit the head 13 into the first fitting portion 33. However, it is sufficient that the dimension across sides of the nut 22 is equal to or larger than the dimension across sides of the head 13 of the hollow bolt 12. In other words, the dimension across flats of the nut 22 may be the same as the dimension across flats of the head 13 of the hollow bolt 12. This will be described later as a modified example.

[0035] Here, we will summarize the actions of the set screw 17 and the nut 22 on the hollow bolt 12. First, when both the set screw 17 and the nut 22 are loosened, the hollow bolt 12 can rotate. Furthermore, with the set screw 17 loosened, movement of the hollow bolt 12 in the X and Y directions is permitted. Next, when the set screw 17 is loosened and the nut 22 is tightened to establish a fastened state, movement of the hollow bolt 12 in the X and Y directions is permitted, but rotation of the hollow bolt 12 is prevented. Note that if the set screw 17 is turned without fixing the rotation of the hollow bolt 12 with the nut 22, the set screw 17 and the hollow bolt 12 will rotate together, and the stator 5 may be displaced in all directions (X, Y, and Z). In this case, it is expected that fine position adjustment of the stator 5, for example, of 0.1 mm or less, will be difficult. By appropriately tightening and loosening the fixing screws 17 and nuts 22, the stator 5 can be kept in a desired state.

[0036] In this embodiment, a first washer 20a and a second washer 20b are disposed between the head 18 of the fixing screw 17 and the head 13 of the hollow bolt 12. The first washer 20a is a spring washer, and the second washer 20b is a plain washer. The first washer 20a and the second washer 20b are included in the pressurizing mechanism 20. The pressurizing mechanism 20 has an elastic force that biases the hollow bolt 12 toward the base portion 100. The first washer 20a is an example of a spring member, and exerts an elastic force (biasing force) that biases the hollow bolt 12 toward the base portion 100. The second washer 20b suppresses slippage between the fixing screw 17 and the hollow bolt 12 and distributes the biasing force to stabilize the positional relationship between them. The pressurizing mechanism 20 may include another elastic member, such as a compression spring, instead of or in addition to the first washer 20a. The pressurizing mechanism 20 biases the hollow bolt 12 with a force that allows slight movement of the hollow bolt 12. This facilitates fine position adjustment of the stator 5 that is integrated with the hollow bolt 12. Furthermore, by providing the pressurizing mechanism 20, the tip end of the hollow bolt 12 is pressed against the base part 100 even when the base end side of the position adjustment mechanism 10 is positioned downward, as shown in FIGS. 1(C) and 1(D), for example. In other words, the position and attitude of the stator 5 can be easily adjusted regardless of the attitude of the rotary encoder 1. A third washer 20c is disposed between the nut 22 and the stator 5.

[0037] [Adjustment tool] Next, the adjustment tool 30 for operating the position adjustment mechanism 10 will be described with reference to Figs. 5 to 8. The adjustment tool 30 includes a first socket member 31 and a second socket member 36. The adjustment tool 30 is used by combining the first socket member 31 and the second socket member 36. The adjustment tool 30 can also be used in combination with a hex wrench 40.

[0038] The first socket member 31 includes a first columnar portion 32. The first columnar portion 32 is hollow and includes a through-hole 32a. As shown in FIG. 8(B) , a hexagonal wrench 40 is inserted into the through-hole 32a. The first columnar portion 32 includes a first fitting portion 33 at its tip, into which the head 13 of the hollow bolt 12 fits. The first fitting portion 33 communicates with the through-hole 32a and has a shape corresponding to the shape of the head 13. In this embodiment, the first fitting portion 33 is hexagonal. The first columnar portion 32 includes a head housing portion 34 located closer to the base end than the first fitting portion 33, which houses the head 18 of the fixing screw 17. The fixing screw 17 reaches the head 18 through the through-hole 32a and is rotated by a hexagonal wrench 40 fitted into the tool hole 18a (see FIG. 3(B)). The first socket member 31 includes a rotation operation portion 35 at the end on the base end side. As shown in Fig. 6(B), the rotary operation unit 35 has a regular dodecagonal shape in a plan view. The shape of the rotary operation unit 35 is not limited to a regular dodecagon and can be appropriately selected taking into consideration the ease of operation by the operator. The rotary operation unit 35 may be, for example, lever-shaped, but is preferably circular or polygonal close to circular.

[0039] The second socket member 36 includes a second columnar portion 37. The second columnar portion 37 is hollow and includes a through-hole 37a. The first columnar portion 32 of the first socket member 31 is inserted into the through-hole 37a. The first columnar portion 32 and the second columnar portion 37 are coaxially rotatable relative to each other. The second columnar portion 37 includes a second fitting portion 38 at its tip, into which the nut 22 fits. The second fitting portion 38 communicates with the through-hole 37a and has a shape corresponding to the shape of the nut 22. In this embodiment, the second fitting portion 38 is hexagonal. The second socket member 36 includes a handle portion 39 on the base end side of the second columnar portion 37. The handle portion 39 extends in a direction perpendicular to the axial direction of the second columnar portion 37. In the front view shown in FIG. 7(A), the handle portion 39 in this embodiment extends on both sides of the second pillar portion 37 and forms a T-shape together with the second pillar portion 37. The shape of the handle portion 39 is not limited to a T-shape and may be other shapes. However, considering that the second socket member 36 is used in combination with the first socket member 31, it is desirable that the handle portion 39 have a shape that protrudes laterally beyond the rotation operation unit 35. A tool fitting portion 37b is formed on the outer peripheral surface of the second pillar portion 37. The tool fitting portion 37b has an outer peripheral shape with four smooth surfaces formed at 90° intervals. The second socket member 36 can also be operated by fitting another tool, such as a wrench, into the tool fitting portion 37b. Using another tool allows for retightening of the nut 22. Furthermore, for example, a torque wrench can be used to control the tightening torque.

[0040] [Position adjustment work] Next, the operation of adjusting the position of the stator 5 by operating the position adjustment mechanism 10 using the adjustment tool 30 will be described with reference to FIGS. 9 and 10. The position adjustment mechanisms 10 are installed at three locations on the stator 5, and position adjustment is performed in each of the position adjustment mechanisms 10. In the following explanation, the adjustment operation in one position adjustment mechanism 10 will be described.

[0041] 9, the stator 5 is attached to the base part 100 by the position adjustment mechanism 10. Specifically, the inner peripheral thread part 7 of the stator 5 is threadedly engaged with the outer peripheral thread part 15a of the hollow bolt 12 into which the fixing screw 17 is inserted, and the hollow bolt 12 is prevented from rotating by the nut 22. The thread part 19 of the fixing screw 17 is fastened to the screw hole 100a of the base part 100, thereby restricting movement in the X, Y, and Z directions and fixing the stator 5.

[0042] The position adjustment mechanism 10 is equipped with a first socket member 31 and a second socket member 36 of the adjustment tool 30. The head 18 of the fixing screw 17 is stored in a head storage compartment 34. A hex wrench 40 fits into a tool hole 18a provided in the head 18 of the fixing screw 17. This allows the fixing screw 17 to rotate as indicated by arrow 8d, thereby tightening or loosening the fixing screw 17. The second socket member 36 also allows the nut 22 to tighten or loosen the fixing screw 17. Tightening the fixing screw 17 and the nut 22 prevents the hollow bolt 12 from rotating. After completing the position adjustment of the stator 5, the position adjustment mechanism 10 is set in a state where the fixing screw 17 is tightened. The rotary encoder 1 is used with the fixing screw 17 tightened. Loosening the fixing screw 17 and the nut 22 allows the hollow bolt 12 to rotate. When adjusting the position of the stator 5, the fixing screw 17 and the nut 22 are set in a loosened state. The hollow bolt 12 becomes rotatable by loosening the fixing screw 17 and the nut 22. By rotating the hollow bolt 12, the position of the stator 5 in the Z direction can be adjusted.

[0043] In this embodiment, the outer diameter R19 of the threaded portion 19 and the inner diameter r14a of the inner circumferential surface 14a of the hollow cylindrical portion 14 have a relationship of outer diameter R19<inner diameter r14a. Therefore, by loosening the fixing screw 17, the stator 5 can be moved in the X direction or Y direction with respect to the central axis AX2 of the threaded hole 100a.

[0044] The second fitting portion 38 is fitted to the nut 22. As a result, by operating the second socket member 36, the nut 22 can be rotated as shown by arrow 8e. The nut 22 is threaded onto the outer peripheral thread portion 15a of the hollow bolt 12. The nut 22 descends relative to the hollow bolt 12 and can be fastened to the stator 5 via the third washer 20c, thereby fixing the stator 5 to the hollow bolt 12. Here, the nut 22 descending relative to the hollow bolt 12 means that the nut 22 moves toward the tip of the hollow bolt 12.

[0045] The first fitting portion is fitted into the head 13 of the hollow bolt 12. As a result, by operating the first socket member 31, the hollow bolt 12 can be rotated as indicated by arrow 8f. The inner peripheral thread portion 7 of the stator 5 is threadedly fitted into the outer peripheral thread portion 15a of the hollow bolt 12. The stator 5 itself is attached to the base portion 100 at three locations. Therefore, the stator 5 does not rotate together with the rotation of the hollow bolt 12 in each position adjustment mechanism 10. As the hollow bolt 12 rotates, the location on the stator 5 where the position adjustment mechanism 10 is installed moves up and down. By adjusting the height position of the location on the stator 5 where the position adjustment mechanism 10 is installed, the relative positional relationship between the rotation axis and the stator 5 can be adjusted, and as a result, the stator 5 can be installed on a plane perpendicular to the rotation axis.

[0046] As described above, the position adjustment mechanism 10 includes three fasteners: the hollow bolt 12, the fixing screw 17, and the nut 22. For this position adjustment mechanism 10, the adjustment tool 30 includes a first socket member 31 and a second socket member 36 that are rotatably combined on the same axis. Furthermore, the adjustment tool 30 includes a through hole 32a into which a hex wrench 40, which is another tool installed on the same axis as the first socket member 31 and the second socket member 36, is inserted. Therefore, the position adjustment mechanism 10 can be easily operated by using the adjustment tool 30.

[0047] When the operator grips the handle portion 39, the first pillar portion 32 is inserted into the second pillar portion 37. The hexagonal wrench 40 is inserted into the through-hole 32a. Therefore, the first socket member 31 is mounted on the second socket member 36 and will not fall off from the second socket member 36. The hexagonal wrench 40 will also not fall off from the adjustment tool 30.

[0048] The worker can hold three tools—the first socket member 31, the second socket member 36, and the hex wrench 40 included in the adjustment tool 30—in one hand. This eliminates the need to switch between common tools, such as a conventional wrench, and reduces work time. Being able to hold the three tools in one hand allows the worker to use the other hand to operate the necessary tool when needed. Furthermore, the hollow bolt 12, the fixing screw 17, and the nut 22 are easily accessible, making work easier.

[0049] As an example of the operation method, for example, a worker can grasp the handle portion 39 of the second socket member 36 with his / her middle finger, ring finger, and palm. In this position, the worker can freely use his / her thumb and index finger. Therefore, the worker can use his / her thumb and index finger to rotate the rotation operation portion 35 and the hex wrench 40 of the first socket member 31. While grasping the handle portion 39, the worker can operate the second socket member 36 by bending his / her wrist toward the palm or back of his / her hand or by moving his / her arm. The worker only needs to operate the part that is engaged with the fastener he / she wants to rotate. When rotating the nut 22, the worker only needs to rotate the second socket member 36 without touching the first socket member 31 or the hex wrench 40. When rotating the hollow bolt 12, the worker only needs to rotate the first socket member 31 without rotating the second socket member 36 or touching the hex wrench 40. When the worker wishes to rotate the fixing screw 17, he or she need only rotate the hexagonal wrench 40 without rotating the second socket member 36 or touching the first socket member 31.

[0050] The worker can perform the adjustment in a way that is easy for the worker to operate. By using the adjustment tool 30, the worker can easily perform the adjustment work when the rotor 2, the stator 5, and the base part 100 are in a sideways position or in an upside-down position as shown in Figures 1(C) and 1(D).

[0051] If the adjustment tool 30 were not used, the worker would have to operate a hex wrench for the fixing screw 17, a wrench for the hollow bolt 12, and a wrench for the nut 22. It would be extremely difficult for one worker to operate these multiple tools simultaneously. Furthermore, the handles of wrenches are long, making it difficult to work in a narrow space. However, by using the adjustment tool 30 of this embodiment, one worker can easily operate the position adjustment mechanism 10. Furthermore, since the adjustment tool 30 is used while being coaxially mounted on the position adjustment mechanism 10, it becomes easier to work in a narrow space.

[0052] 10, an example of how each part of the position adjustment mechanism 10 and the stator 5 move when adjusting the position of the stator 5 will be described. For convenience of drawing, the adjustment tool 30 is omitted from Fig. 10, and only the movements of each part included in the position adjustment mechanism 10 and the stator 5 are shown.

[0053] (a) in Figure 10 shows the initial state, in which the fixing screw 17 and the nut 22 are tightened and the hollow bolt 12 cannot rotate. In Figure 10, the height position of the fixing screw 17 in this initial state is indicated as HP17, the height position of the nut 22 is indicated as HP22, and the height position of the stator 5 is indicated as HP5.

[0054] In (b) of Figure 10, the fixing screw 17 is loosened from the initial state, and the height position of the fixing screw 17 is raised from the initial state. However, in the state shown in (b), the nut 22 is still in a fixed state. Therefore, as shown in (c), the nut 22 is loosened. This allows the hollow bolt 12 to rotate, and the stator 5 can be raised or lowered.

[0055] As shown in (c), when there is room for the stator 5 to move, rotating the hollow bolt 12 causes the stator 5 to rise or fall. After moving the stator 5 to the desired position as shown in (d), the nut 22 can be tightened to fasten the stator 5 as shown in (e), thereby holding the stator 5 at any desired distance. By adjusting the height position of the stator 5 in this way at multiple locations, the tilt of the stator 5 relative to the rotor 2 can be eliminated, and the stator 5 can be installed parallel to the rotor 2 and at any desired height. When the fixing screw 17 is loosened as shown in (b) to (e), the stator 5 can be moved in the X direction or Y direction relative to the central axis AX2 of the screw hole 100a.

[0056] After the position adjustment of the stator 5 is completed, the fixing screws 17 are tightened as shown in (f). This fixes the eccentricity direction and height direction of the stator 5. Once the adjustment of the stator 5 is completed using the position adjustment mechanisms 10 at three locations, the rotary encoder 1 can be put to use.

[0057] [effect] The position adjustment mechanism 10 of this embodiment includes a hollow bolt 12 whose outer peripheral thread portion 15a is threadedly engaged with the inner peripheral thread portion 7 of the stator 5, which is the part to be adjusted in position. This allows the hollow bolt 12 to be rotated to adjust the height position of the stator 5. The position adjustment mechanism 10 also includes a nut 22 that threads onto the outer peripheral thread portion 15a, and a fixing screw 17 that is inserted into the hollow tubular portion 14 and threadedly engaged with the base portion 100. This prevents the hollow bolt 12 from rotating, allowing the stator 5 to be fixed.

[0058] In the position adjustment mechanism 10 of this embodiment, the dimension across flats of the nut 22 is larger than the dimension across flats of the head 13 of the hollow bolt 12. This makes it easier for the head 13 to fit into the first fitting portion 33, and also makes it easier for the nut 22 to fit into the second fitting portion 38.

[0059] The diameter of the inner peripheral surface 14a of the hollow cylindrical portion 14 is set to a dimension that forms a gap between the threaded portion 19 of the fixing screw 17 and the hollow bolt 12, allowing the stator 5, which is threadedly engaged with the hollow bolt 12, to move in a direction perpendicular to the axial direction of the fixing screw 17. This allows the stator 5 to move in the X direction and the Y direction relative to the central axis AX2 of the screw hole 100a.

[0060] By providing the pressure mechanism 20, it becomes easy to move the stator 5 minutely, and it becomes easy to adjust the eccentricity direction.

[0061] Furthermore, by providing the pressure mechanism 20, the position of the stator 5 can be maintained even when the rotor 2, the stator 5 and the base part 100 are in a sideways or upside down environment.

[0062] The adjustment tool 30 includes a first socket member 31 having a first pillar-shaped portion 32 with a first fitting portion 33, and a second socket member 36 that is coaxially rotatable relative to the first pillar-shaped portion 32 and has a second pillar-shaped portion 37 with a second fitting portion 38. This allows the position adjustment mechanism 10 to be easily operated.

[0063] The first columnar portion 32 of the adjustment tool 30 has a through hole 32a into which a hexagonal wrench 40 is inserted from the base end side to rotate the fixing screw 17. This makes it easy to operate the hexagonal wrench 40 and rotate the fixing screw 17.

[0064] The second socket member 36 includes a handle portion 39 extending in a direction perpendicular to the axial direction of the second columnar portion 37. This makes it easier to operate the adjustment tool 30.

[0065] The adjustment tool 30 and the hex wrench 40 can be held in one hand, eliminating the need to change hands, thereby shortening the work time. This also makes the work easier when the rotor 2, stator 5, and base 100 are in a sideways or upside-down environment.

[0066] In this embodiment, the part to be adjusted in position is the stator 5, but the position adjustment mechanism 10 and the adjustment tool 30 are not limited to the position adjustment work of the stator 5, and can also be used for the position adjustment work of other equipment or components.

[0067] (Variation 1) Next, the position adjustment mechanism 41 and the adjustment tool 50 of the first modification will be described with reference to FIGS.

[0068] The position adjustment mechanism 41 includes a hollow bolt 42 instead of the hollow bolt 12 in the position adjustment mechanism 10. The dimension across flats of the head 43 of the hollow bolt 42 matches the dimension across flats of the nut 22. In this first modification, the dimension across flats of the head 43 is made larger than the dimension across flats of the head 13, so that the dimension across flats of the head 43 and the dimension across flats of the nut 22 match.

[0069] The hollow bolt 42 has a cylindrical portion 44 below the head 43, i.e., closer to the tip than the head 43. The cylindrical portion 44 does not have a thread, and is formed as a simple cylindrical portion. An outer thread portion 45a is provided closer to the tip than the cylindrical portion 44, and the nut 22 is threaded onto this outer thread portion 45a. The outer diameter R

[44] of the cylindrical portion 44 matches the outer diameter of the outer thread portion 45a, and the cylindrical portion 44 does not have a thread. Therefore, the nut 22 cannot move on the cylindrical portion 44. In other words, the cylindrical portion 44 determines the upper limit of the movement of the nut 22 toward the base end. Referring to FIG. 11, the cylindrical portion 44 includes a first portion 44a and a second portion 44b that forms a constriction between the first portion 44a and the head 43. The distance from the head 43 to the tip of the first portion 44a is defined as the height h

[44] of the cylindrical portion 44.

[0070] 11, the distance between the head 43 and the nut 22 is a distance t. The distance t varies depending on the position of the nut 22. The distance t is at its minimum distance tmin when the nut 22 is at its upper limit position.

[0071] Even with this position adjustment mechanism 41, the position of the stator 5 can be easily adjusted, similar to the position adjustment mechanism 10.

[0072] 12 is used in place of the adjustment tool 30 to operate the position adjustment mechanism 41. The adjustment tool 50 includes a first socket member 51 and a second socket member 56.

[0073] The first socket member 51 includes a first fitting portion 53 and a head housing portion 54. The head housing portion 54 corresponds to the head housing portion 34. The first fitting portion 53 corresponds to the first fitting portion 33. The shape of the first fitting portion 53 is hexagonal, similar to the first fitting portion 33, and the diameter of its inscribed circle is the inner diameter R

[53] . The inner diameter R

[53] is set to match the opposite side dimension of the head 43 of the hollow bolt 42. In the first modification, as described above, the opposite side dimension of the head 43 is made larger than the opposite side dimension of the head 13, so that the opposite side dimension of the head 43 and the opposite side dimension of the nut 22 are the same. Therefore, R

[53] is larger than the diameter of the inscribed circle of the first fitting portion 33.

[0074] The second socket member 56 has a second fitting portion 58. The second fitting portion 58 corresponds to the second fitting portion 38. The shape of the second fitting portion 58 is hexagonal, similar to the second fitting portion 38, and the diameter of the inscribed circle is the inner diameter R

[58] . The inner diameter R

[58] is set to match the dimension of the opposite sides of the nut 22.

[0075] As described above, the flat dimension of the head 43 of the hollow bolt 42 is the same as the flat dimension of the nut 22. Therefore, the inner diameter R

[58] is the same as the inner diameter R

[53] . The inner diameter R

[53] and the inner diameter R

[58] are larger than the outer diameter R

[44] .

[0076] Referring to Fig. 12, the second fitting portion 58 has a depth D

[58] . Referring to Fig. 13(A), the depth D

[58] is smaller than the interval t and smaller than the height h

[44] of the cylindrical portion 44. Also, referring to Fig. 13(B), the depth D

[58] is smaller than the minimum interval tmin. In other words, the depth D

[58] is smaller than the interval t regardless of the position of the nut 22.

[0077] This configuration is used to make it easier to remove the second socket member 56. The dimension across flats of the head 43 of the hollow bolt 42 included in the position adjustment mechanism 41 matches the dimension across flats of the nut 22. Here, assume that the circumferential orientation of the nut 22 and the circumferential orientation of the head 43 of the hollow bolt 42 are different, and the positions of their hexagons do not match. Here, if the second fitting portion 58 simply had a hexagonal shape, the second socket member 56, which follows the orientation of the nut 22, would collide with the head 43 and would not be able to be removed.

[0078] Therefore, Modification 1 has the shape and dimensional relationship of each part as described above. In Figures 13(A) and 13(B), depth D

[58] is smaller than distance t and smaller than height h

[44] of cylindrical portion 44. Therefore, second socket member 56 can be pulled up to bring second fitting portion 58 and cylindrical portion 44 into a state where they face each other.

[0079] Here, the inner diameter R

[58] is larger than the outer diameter R

[44] . Therefore, the second socket member 56 can be rotated to change its circumferential orientation. Therefore, the second socket member 56 is rotated to align the orientation of the hexagonal shape of the second fitting portion 58 with the orientation of the head 43. This allows the second fitting portion 38 to pass through the head 43, and the worker can remove the second socket member 56.

[0080] (Variation 2) Next, Modification 2 will be described with reference to FIG. 14(A). The second socket member 36 shown in FIG. 5(A) has four smooth surfaces on the outer peripheral surface of the second columnar portion 37. In contrast, the tool fitting portion 37b' of the second socket member 36' of Modification 2 has a hexagonal outer peripheral shape. Another tool, such as a wrench, can be fitted into the tool fitting portion 37b' for operation. Using another tool allows for retightening of the nut 22. Furthermore, for example, using a torque wrench allows for control of the tightening torque. The shape of the tool fitting portion is not limited to a square or hexagonal shape, and may be another polygonal shape.

[0081] (Variation 3) Next, Modification 3 will be described with reference to FIG. 14(B). The second socket member 36 shown in FIG. 5(A) has a through hole 37a. The opening of the through hole 37a is circular. In contrast, the opening of the through hole 37a in the second socket member 36'' of Modification 3 is a tool fitting portion 37c. The tool fitting portion 37c is provided as an engagement hole whose inner periphery is polygonal. The tool fitting portion 37c can also be operated by fitting another tool, such as a hexagonal wrench. The nut 22 can be tightened using the other tool. Furthermore, the tightening torque can be controlled using a torque wrench, for example. The shape of the tool fitting portion 37c is not limited to a hexagonal shape and may be a square or other polygonal shape.

[0082] (Variation 4) In the adjustment tool 30 of this embodiment, the first socket member 31 and the second socket member 36 are separable. In contrast, the first socket member 61 and the second socket member 66 included in the adjustment tool 60 shown in Figures 15(A) to 15(C) can be provided with a retaining mechanism 70 for preventing one from coming off the other. The retaining mechanism 70 includes an engagement groove 621 formed on the outer peripheral surface of the first columnar portion 62 of the first socket member 61 and a setscrew 63 threaded into a threaded hole 661 provided in the side wall of the second socket member 66.

[0083] The setscrew 63 is provided so that its tip is positioned within and can engage with the engagement groove 621 when the first columnar portion 62 is inserted into the through-hole 67a. However, a predetermined gap is formed between the tip of the setscrew 63 and the bottom surface of the engagement groove 621 so that the first socket member 61 and the second socket member 66 can rotate relative to each other. After the amount of threading of the setscrew 63 is adjusted so as to maintain this predetermined gap, the setscrew 63 may be fixed with an adhesive or the like so that its position is maintained.

[0084] By providing the retaining mechanism 70, the first socket member 61 and the second socket member 66 can be handled as a single unit, preventing them from accidentally falling off each other, and facilitating the operation of the adjustment tool 60.

[0085] The set screw 63 may be changed to another member, such as a pin-shaped member or a small piece-shaped member, that can protrude into the engagement groove 621 so as to be able to engage with the engagement groove 621. The screw hole 661 may also be changed as appropriate depending on the shape of the member being used.

[0086] Although the embodiments of the present invention have been described in detail above, the present invention is not limited to such specific embodiments, and various modifications and variations are possible within the scope of the gist of the present invention as defined in the claims. [Explanation of symbols]

[0087] 1...rotary encoder, 2...rotor, 2a...fitting hole, 5...stator (position adjustment target part), 6...mounting hole, 7...inner peripheral threaded part, 10, 41...position adjustment mechanism, 12, 42...hollow bolt, 13, 43...head, 14...hollow cylindrical part, 14a...inner peripheral surface, 15...outer peripheral surface, 15a...outer peripheral threaded part, 17...fixing screw, 18...head, 18a...tool hole, 19...threaded part, 20...pressurization mechanism, 20a...first washer, 20b...second washer, 22...nut , 30, 50, 60...adjustment tool, 31, 51, 61...first socket member, 32...first columnar portion, 32a...through hole, 33...first fitting portion, 34, 54...head storage portion, 35...rotation operation portion, 36, 56, 66...second socket member, 37...second columnar portion, 37a...through hole, 38...second fitting portion, 39...handle portion, 40...hexagonal wrench, 100...base portion, 100a...screw hole, 101...rotation shaft member

Claims

1. A position adjustment mechanism that adjusts the position of a position adjustment target part relative to a base part, a hollow bolt having a hollow cylindrical shaft portion and an outer peripheral thread portion on an outer surface of the shaft portion that screws into an inner peripheral thread portion provided in a mounting hole provided in the position adjustment target portion; a nut that is screwed onto the outer peripheral thread portion; a fixing screw that is inserted through the hollow cylindrical portion and screwed into the base portion; Equipped with The diameter of the inner peripheral surface of the hollow cylindrical portion is set to a dimension such that a gap is formed between the hollow cylindrical portion and the threaded portion of the fixing screw, allowing the position adjustment target portion threaded with the hollow bolt to move in a direction perpendicular to the axial direction of the fixing screw. Position adjustment mechanism.

2. The dimension of the opposite sides of the nut is equal to or greater than the dimension of the opposite sides of the head of the hollow bolt. The position adjustment mechanism according to claim 1 .

3. The hollow bolt further includes a pressurizing mechanism that biases the hollow bolt toward the base portion. The position adjustment mechanism according to claim 1 .

4. The pressure applying mechanism includes a spring member disposed between a head of the fixing screw and a head of the hollow bolt. The position adjustment mechanism according to claim 3 .

5. The spring member is a spring washer through which a threaded portion of the fixing screw is inserted. The position adjustment mechanism according to claim 4 .

6. an adjustment tool for adjusting the position of a position adjustment target part relative to a base part by operating a position adjustment mechanism including: a hollow bolt having an outer peripheral thread part on an outer peripheral surface of a hollow tubular part, the outer peripheral thread part being threaded with an inner peripheral thread part provided in a mounting hole provided in the position adjustment target part, the position of the position adjustment target part being adjustable relative to the base part; a nut threaded with the outer peripheral thread part; and a fixing screw inserted into the hollow tubular part and threaded with the base part, a first socket member having a first columnar portion with a first fitting portion at its tip end into which the head of the hollow bolt fits; a second socket member having a second pillar portion into which the first pillar portion is inserted from a base end side and which is provided coaxially and rotatably relative to the first pillar portion, and which has a second fitting portion at an end on a tip side into which the nut is fitted; Equipped with The first columnar portion has a through hole into which a tool for rotating the fixing screw is inserted from the base end side. Adjustment tool.

7. The second socket member includes a handle portion extending in a direction perpendicular to the axial direction of the second columnar portion. The adjustment tool according to claim 6.

8. The second socket member has a tool fitting portion into which a tool other than the first socket member is fitted. The adjustment tool according to claim 6.

9. The tool fitting portion is a cylindrical portion of the second socket member having a polygonal outer circumferential shape. The adjustment tool of claim 8.

10. The tool fitting portion includes an engagement hole having a polygonal inner circumferential shape. The adjustment tool of claim 8.

11. A method for adjusting the position of the position adjustment target part relative to the base part using the adjustment tool according to claim 6, comprising: a step of rotating the second socket member with the nut fitted to the second fitting portion, inserting a tool for rotating the fixing screw into the through hole of the first columnar portion, and loosening the fixing screw with the tool to make the hollow bolt rotatable; a step of adjusting a distance of the position adjustment target portion relative to the base portion by rotating a first socket member having a head portion of the hollow bolt fitted into the first fitting portion; a step of moving the position adjustment target portion in a plane parallel to the base portion while the fixing screw is loosened; tightening the nut to fix the distance of the position adjustment target portion relative to the base portion; a step of tightening the fixing screw to fix the position adjustment target portion in a plane parallel to the base portion; Including, How to adjust the position.

12. the step of moving the position adjustment target portion within a plane parallel to the base portion while the fixing screw is loosened is performed while a pressure mechanism is biasing the hollow bolt toward the base portion. The position adjustment method according to claim 11 .

Images