Work-piece turntable

Abstract

To provide a work-piece turntable that is able to easily position a locking shaft according to a size of a work-piece.SOLUTION: A work-piece turntable 10 on which a work-piece W having a cylindrical outer peripheral shape is placed so as to be rotatable about a longitudinal axis thereof, comprises: a base portion 12; a placing portion 14 having a V-shaped groove formed in a longitudinal direction on the base portion 12, and configured to place the work-piece W in the V-shaped groove; and a stopper 16 including: a base 18 that is detachably disposed in the V-shaped groove; a locking shaft 20 which is disposed to slidably pass through the base 18, a longitudinal direction of which is inclined with respect to the longitudinal axis of the work-piece W, and a tip portion of which locks an end part of the work-piece W; and a stopper fixing knob 22 for fixing the locking shaft 20 to the base 18. An angle at which the locking shaft 20 is inclined with respect to the longitudinal axis of the work-piece W is set to correspond to a groove angle θ of the V-shaped groove so that the tip portion of the locking shaft 20 locks an axial center part of the work-piece.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a workpiece turntable. [Background technology]

[0002] Inspection devices for inspecting the runout of shaft-like members and tools are known, and in such inspection devices, in order to precisely inspect the runout, it is required that the shaft-like member or tool placed on a support is allowed to rotate about its axis, but is not allowed to translate in the direction along the axis or in the radial direction. Therefore, for example, Patent Document 1 discloses a positioning device configured to bring a hemispherical end of a rod-like member into contact with a point including the axis of a test part in order to suppress translation in the direction along the axis during inspection.

[0003] This positioning device includes a base having a sleeve for sliding and a rod-shaped member slidably inserted into the sleeve of the base, and is configured to adjust the height position of the contact point of the rod-shaped member that contacts the test part by sliding the rod-shaped member. Specifically, on the premise that the angle of the V-shaped body for placing the test part is 90 degrees, the height position is determined by the product of the radius of the test part and the square root of 2, and the sleeve is configured to allow the rod-shaped member to slide along a direction that forms an angle of half the angle of the V-shaped body, i.e., 45 degrees, with the axis of the test part. This allows the contact point of the rod-shaped member to contact a point including the axis of the test part. However, since the length of the rod-shaped member exposed from the base changes due to the sliding, it becomes necessary to slide the test part against which the tip of the rod-shaped member abuts in a direction along the axis. This may make the adjustment of the height position complicated.

[0004] Furthermore, the inspection device described in Patent Document 1 is configured to position the height position of the rod-shaped member by sandwiching the test member between the board connected to the end of the rod-shaped member and the upper surface of the base. However, in addition to the complicated adjustment of the height position, if the diameter of the test member is large or the weight is heavy, it may be difficult to sandwich the test member. Furthermore, since the rod-shaped member may slide somewhat to remove the test member sandwiched between the board and the upper surface of the base, there is a possibility that the positioned height position may be shifted. In addition, in the inspection device described in Patent Document 1, the rod-shaped member is fixed using a side fine screw, but as the diameter of the test part increases, the amount of turning the side fine screw increases, which increases the number of work steps. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Special Publication No. 2002-511570 Summary of the Invention [Problem to be solved by the invention]

[0006] SUMMARY OF THE PRESENT DISCLOSURE In view of the above circumstances, an object of the present invention is to provide a workpiece turntable that can easily align a locking shaft in accordance with the dimensions of a workpiece. [Means for solving the problem]

[0007] According to one aspect of the present invention, there is provided a work turntable for rotatably mounting a workpiece having a cylindrical outer peripheral shape around its longitudinal axis, the work turntable comprising: a base; a mounting portion having a V-groove formed on the base along the longitudinal direction, for mounting the workpiece in the V-groove; a base that is removably arranged in the V-groove; and a stopper that is slidably arranged and penetrates the base, the longitudinal direction of which is inclined relative to the longitudinal axis of the workpiece, and the tip of which engages the end of the workpiece, and the stopper has a fixing mechanism for fixing the locking shaft to the base, and the angle at which the locking shaft is inclined relative to the longitudinal axis of the workpiece is set to correspond to the groove angle of the V-groove so that the tip of the locking shaft engages the axial center portion of the workpiece.

[0008] According to one aspect of the present invention, the base may comprise a first member and a second member connected at one end, wherein a first mounting portion that can be placed in a V-shaped groove is formed at the other end of the first member, and a second mounting portion that can be placed in the V-shaped groove is formed at the other end of the second member through which the locking shaft is disposed, and wherein the locking shaft is fixed so that its tip abuts the outer periphery of the workpiece when the first mounting portion is disposed in the V-shaped groove, and the second mounting portion is disposed in the V-shaped groove with the locking shaft fixed, thereby causing the tip to engage the axial center portion of the workpiece.

[0009] Furthermore, according to one aspect of the present invention, the V-groove may be formed with a plurality of contact member placement sections along the longitudinal direction of the V-groove, where a contact member that contacts the workpiece can be placed.

[0010] According to one aspect of the present invention, the workpiece may further include a holding mechanism for holding the workpiece in the V-groove, and a rotation mechanism for rotating the workpiece placed in the V-groove.

[0011] Furthermore, according to one aspect of the present invention, the inclination angle α of the locking shaft with respect to the longitudinal axis of the workpiece, the groove angle θ of the V-shaped groove, and the angle α + β between the first member and the second member of the base are expressed by the following relational expression: α=arcsin[sinβ / {1+sin(θ / 2)}] It may be expressed as: Effect of the Invention

[0012] According to one aspect of the present invention, the workpiece turntable includes a base detachably disposed in the V-groove, a locking shaft slidably disposed in the base, the longitudinal direction of which is inclined with respect to the longitudinal axis of the workpiece, and a stopper having a fixing mechanism for fixing the locking shaft to the base. Therefore, by sliding the locking shaft inclined with respect to the longitudinal axis of the workpiece in the base, the position of the tip of the locking shaft can be aligned with the position of the axial center of the workpiece placed in the V-groove. In addition, the aligned locking shaft can be fixed to the base by the fixing mechanism. Therefore, it is possible to prevent or suppress the aligned locking shaft from shifting. Furthermore, the base for arranging the locking shaft can be detachably disposed in the V-groove. Therefore, when aligning the locking shaft, it is only necessary to move the base relative to the V-groove, and the locking shaft can be aligned with the base after preventing or suppressing the translational movement of the workpiece along the longitudinal direction, i.e., the axial direction. In addition, the angle of inclination of the locking shaft with respect to the longitudinal axis of the workpiece is set to correspond to the groove angle of the V-shaped groove so that the tip of the locking shaft locks the axial center of the workpiece. Therefore, by sliding the locking shaft within the base, the position of the tip can be easily aligned to the axial center of the workpiece. This makes it easy to align the locking shaft according to the dimensions of the workpiece.

[0013] According to a workpiece rotating table according to one aspect of the present invention, the base includes a first member and a second member connected at one end, and the locking shaft is disposed penetrating the second member. Therefore, the tip of the locking shaft can be brought into contact with the cylindrical outer periphery of the workpiece when the first mounting portion of the first member is disposed in the V-groove. Furthermore, in this state, the locking shaft is fixed by a fixing mechanism, and the second mounting portion is disposed in the V-groove, so that the tip can lock the axial center portion of the workpiece. Therefore, when aligning the locking shaft with the workpiece, it is only necessary to change the position of the base disposed in the V-groove, and the locking shaft can be aligned with the base while preventing or suppressing translational movement of the workpiece along the axial direction. This makes it possible to easily align the locking shaft according to the dimensions of the workpiece.

[0014] Furthermore, in the workpiece turntable according to one aspect of the present invention, a plurality of abutment member arrangement sections are formed along the longitudinal direction of the V-groove, and the abutment members that abut against the workpiece can be arranged in the abutment member arrangement sections. This allows the workpiece to be stably arranged in the V-groove, making it easy to align the locking shaft according to the size of the workpiece.

[0015] In addition, the workpiece turntable according to one aspect of the present invention further includes a holding mechanism for holding the workpiece in the V-groove and a rotation mechanism for rotating the workpiece placed in the V-groove, so that the workpiece placed in the V-groove can be rotated while preventing or suppressing translational movement of the workpiece in the axial direction or radial direction.

[0016] Furthermore, in the workpiece turntable according to one aspect of the present invention, the inclination angle α of the locking shaft with respect to the longitudinal axis of the workpiece, the groove angle θ of the V-groove, and the angle α+β between the first and second members of the base have a geometric relationship. Therefore, the locking shaft is fixed so that the tip abuts the outer periphery of the workpiece when the first mounting part is placed in the V-groove, and the second mounting part is placed in the V-groove with the locking shaft fixed, whereby the axial center of the workpiece can be locked by the tip. This makes it easy to align the locking shaft according to the dimensions of the workpiece. [Brief description of the drawings]

[0017] [Figure 1] FIG. 1 shows a perspective view of a workpiece rotating table according to this embodiment. [Diagram 2] FIG. 2 shows a perspective view of the workpiece turntable with no workpiece placed thereon. [Diagram 3] FIG. 3 shows a perspective view of the stopper. [Figure 4] FIG. 4 shows a perspective view of the locking shaft pressing member. [Diagram 5] FIG. 5 shows a front view of the workpiece turntable as viewed from the end side in the longitudinal direction. [Figure 6] FIG. 6 shows a plan view of the workpiece turntable. [Figure 7A] FIG. 7A is a cross-sectional view of the workpiece turntable cut in the longitudinal direction at the center of the V-groove, showing a state in which the first member is placed in the V-groove. [Figure 7B] FIG. 7B is a cross-sectional view of the workpiece turntable cut in the longitudinal direction at the center of the V-groove, showing a state in which a second member is placed in the V-groove. [Figure 8] FIG. 8 is an explanatory diagram of the geometric relationship between the V-groove and the locking shaft and base of the stopper. [Figure 9] FIG. 9 is an explanatory diagram of the mechanism by which axial runout of a workpiece occurs. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] Hereinafter, a workpiece rotating table according to an embodiment will be described with reference to the accompanying drawings. Similar or corresponding elements are given the same reference numerals, and duplicated explanations will be omitted. In order to facilitate understanding, the scale of the drawings may be changed.

[0019] 1 and 2 show perspective views of the workpiece rotating table 10. The workpiece rotating table 10 is configured to inspect a member (workpiece W) or a tool having a cylindrical outer peripheral shape, and includes a base 12 serving as a foundation, and a mounting portion 14 formed on the base 12 for mounting the workpiece W. The portion of the mounting portion 14 for mounting the workpiece W is formed in a V-groove shape, and the workpiece W is mounted so that the outer peripheral portion abuts against this V-groove portion. Here, the V-groove portion is formed so that the groove angle θ of the V-groove portion is 90 degrees (right angle) as shown in FIG. 5. Note that, here, the groove angle θ of the V-groove portion is described as a right angle, but is not limited thereto, and the groove angle of the V-groove portion may be an acute angle or an obtuse angle as described later.

[0020] As shown in FIG. 1, the workpiece rotating table 10 includes a stopper 16 to prevent or suppress translational movement of the workpiece W placed on the placement portion 14 in the longitudinal direction, i.e., along the axial direction. The stopper 16 is configured to lock one end of the workpiece W, i.e., the end placed on the placement portion 14. The stopper 16 includes a base 18 for placing the workpiece W on the V-groove portion, and a locking shaft 20 arranged to slidably penetrate the base 18. The base 18 is formed in an inverted L-shape in a side view when the base 18 is placed on the V-groove portion from the side of the workpiece rotating table 10. Specifically, the base 18 has a rectangular parallelepiped first member 18a and a second member 18b, which are integrally formed on one end side and extend perpendicular to each other to form an inverted L-shape as a whole. For this reason, the angle α+β (see FIG. 7A and FIG. 7B) between the first member 18a and the second member 18b is formed to be 90 degrees (a right angle). Here, the angle α+β between the first member 18a and the second member 18b of the base 18 is described as being a right angle, but this is not limited thereto, and the first member and the second member may be formed to form an acute angle or an obtuse angle as described later. Here, the first member 18a and the second member 18b are described as being integrally formed, but this is not limited thereto, and the first member and the second member may be separate parts, and the stopper may be formed by assembling these.

[0021] A first mounting portion 19a for mounting on the V-groove portion is formed on the other end side of the first member 18a, and a second mounting portion 19b for mounting on the V-groove portion is formed on the other end side of the second member 18b. Here, the first mounting portion 19a and the second mounting portion 19b are formed so that the shape when mounted on the V-groove portion is trapezoidal when viewed from the longitudinal end side of the mounting portion 14. Therefore, the first mounting portion 19a and the second mounting portion 19b can abut on the V-groove portion, and the stopper 16 can be stably mounted. Here, the first mounting portion 19a and the second mounting portion 19b are described as being formed in a trapezoidal shape, but this is not limited thereto. For example, the first mounting portion and the second mounting portion may be formed in a V-shape so as to be in close contact with the V-groove portion, or may be a leg or attachment portion that can be fixed to the outside of the V-groove portion. Furthermore, without being limited thereto, the holding force of the stopper in the V-groove portion may be improved by forming protrusions on the surfaces of the first and second mounting portions for fitting into the rack groove portion described below, or by forming the first and second mounting portions and the V-groove portion from a magnetic material.

[0022] The second member 18b of the base 18 has a through hole formed along a direction penetrating the second member 18b at an angle, and a rod-shaped locking shaft 20 is slidably disposed inside the through hole. Therefore, when the second mounting portion 19b of the stopper 16 is mounted on the V-groove portion, the locking shaft 20 is configured to be inclined at a predetermined inclination angle α with respect to the longitudinal axis of the workpiece W, i.e., the axial center (see FIG. 7B). As a result, when the second mounting portion 19b of the stopper 16 is mounted on the V-groove portion, the hemispherical tip portion 20a of the locking shaft 20 can be directed toward the lower side of the workpiece rotating table 10 and the end side of the workpiece W, and the height position of the tip portion 20a can be adjusted to match the height position of the axial center of the workpiece W by sliding the locking shaft 20. By abutting the tip portion 20a of the locking shaft 20 against the end face of the workpiece W in this manner, translational movement along the axial center direction of the workpiece W can be prevented or suppressed.

[0023] As shown in FIG. 3, a locking shaft knob 20b is attached to the end of the locking shaft 20 opposite to the tip 20a, allowing a user (not shown) to easily slide the locking shaft 20. Therefore, a user can easily slide the locking shaft 20 by gripping the locking shaft knob 20b. Furthermore, the stopper 16 includes a stopper fixing knob 22 and a stopper holding member 24 as a fixing mechanism for fixing the locking shaft 20 adjusted to match the height position of the axis of the workpiece W. The stopper holding member 24, whose outer periphery is formed into a cylindrical shape, is disposed at a position where it contacts the locking shaft 20, and the stopper fixing knob 22 is disposed so that the tip of its threaded portion contacts the stopper holding member 24. Therefore, the locking shaft 20 can be fixed via the stopper holding member 24 by rotating the stopper fixing knob 22 and pushing the stopper holding member 24 downward while pressing it downward. 4, a recess 24a is formed in an arc shape along the outer circumferential shape of the locking shaft 20 at the portion of the stopper holding member 24 that comes into contact with the locking shaft 20. This allows the torsional force caused by the rotation of the stopper fixing knob 22 to be efficiently transmitted to the locking shaft 20 via the stopper holding member 24, so that the locking shaft 20 can be stably fixed and micro-movements during fixing can be prevented or reduced.

[0024] 2 and 5, the mounting portion 14 has a rack groove portion 28 on the upper side as a contact member arrangement portion, and has a pair of rack-shaped members 26 arranged at an angle on the upper side of the base 12. The V-shaped groove portion of the mounting portion 14 is formed by these rack-shaped members 26. Note that in the following description, the V-shaped groove portion will be described as being formed by the rack-shaped members 26, but this is not limiting, and for example, the V-shaped groove portion may be formed by a member that does not have a rack portion and has a flat surface.

[0025] The rack grooves 28 are continuously formed along the longitudinal direction on the upper side of the rack-shaped member 26, and cylindrical pins 30 serving as cylindrical contact members are detachably arranged in the rack grooves 28. Here, four cylindrical pins 30 are arranged in the rack grooves 28 on both sides of the V-groove portion and at intervals in the longitudinal direction of the workpiece W to be placed on the placement portion 14. Therefore, when the workpiece W is placed on the placement portion 14, the workpiece W abuts against the four cylindrical pins 30 (see FIG. 1). This allows the workpiece W to be stably held in the V-groove portion and the workpiece W to be stably rotated in the V-groove portion. Furthermore, since the cylindrical pins 30 are detachable, the longitudinal span in which the workpiece W is held by the four cylindrical pins 30, i.e., the holding span, can be easily changed according to the length of the workpiece W. Furthermore, since the rack-shaped member 26 and the cylindrical pin 30 are both widely used mechanical components, they can be easily procured at low cost. Moreover, when the cylindrical pin 30 becomes worn, it is only necessary to replace the cylindrical pin 30, thereby suppressing increases in labor hours and costs.

[0026] As shown in FIG. 2, a guide groove 32 is formed in one side of the base 12 along its longitudinal direction, and a driver base 34 is disposed in the guide groove 32 so as to be slidable along the guide groove 32. As shown in FIG. 5, the driver base 34 is connected to a disk-shaped guide roller 34a disposed in the guide groove 32, and when a user slides the driver base 34, the guide roller 34a rotates and moves in the guide groove 32. This allows the driver base 34 to slide along the longitudinal direction of the base 12. Note that here, the guide groove 32 and the driver base 34 are disposed on the left side when looking at the base 12 from the side on which the workpiece W is placed, but this is not limited thereto. For example, taking into consideration differences in the handedness of users and the measuring instrument to be combined, the guide groove 32 may be formed on the right side of the base, and the driver base may be disposed on the right side by changing the handedness of the same part.

[0027] As shown in Fig. 5, a plate-shaped arm 36 is rotatably attached to the upper side of the driver base 34. An arm lever 36a is formed on the upper side of the arm 36, and the user can rotate the tip side of the arm 36, i.e., the end on the placement unit 14 side, upward by pushing the arm lever 36a downward (arrow in Fig. 5) (see Fig. 2). A disk-shaped drive roller 38 serving as a holding mechanism is rotatably attached to the end on the placement unit 14 side of the arm 36. Therefore, when the arm 36 is lowered to the placement unit 14 side, the workpiece W placed on the placement unit 14 can be pressed down by the drive roller 38, and the workpiece W can be stably held in the V-shaped groove portion of the placement unit 14.

[0028] As shown in FIG. 6, the arm 36 is also provided with a belt 40 and a pair of pulleys 42 as a rotation mechanism. One pulley 42 is connected to the drive roller 38, and the other pulley 42 is connected to a drive knob 44 provided for a user to rotate it. Therefore, the other pulley 42 rotates when the user rotates the drive knob 44, and the drive roller 38 rotates when the user rotates one pulley 42 via the belt 40. This allows the workpiece W that the drive roller 38 abuts to rotate. Here, the arm 36 and the drive roller 38 are arranged offset from the direction perpendicular to the longitudinal direction of the placement portion 14 and the axial direction of the workpiece W (the dashed line in FIG. 6). Therefore, the drive roller 38 can rotate the workpiece W while pressing it down.

[0029] 7A and 7B show the procedure for aligning the locking shaft 20 of the stopper 16. As shown in FIG. 7A, first, the first mounting portion 19a of the stopper 16 is mounted on the V-groove portion of the mounting portion 14, and the tip portion 20a of the locking shaft 20 is brought into contact with the outer peripheral surface of the workpiece W, thereby aligning the locking shaft 20 with respect to the base 18. At this time, that is, when the first mounting portion 19a is mounted on the V-groove portion of the mounting portion 14, the locking shaft 20 is configured to be inclined at a predetermined inclination angle β with respect to the longitudinal axis of the workpiece W, that is, the axis center. The aligned locking shaft 20 is fixed by the stopper fixing knob 22.

[0030] 7B, with the locking shaft 20 fixed, the base 18 is inverted and the second mounting portion 19b is placed on the V-groove of the mounting portion 14. This allows the tip portion 20a of the locking shaft 20 to abut against the axial center portion of the workpiece W, i.e., the axial center portion, to lock the workpiece W.

[0031] In this manner, by abutting the tip portion 20a of the locking shaft 20 against the outer peripheral surface of the workpiece W, the locking shaft 20 can be aligned with respect to the base 18 because the inclination angle α of the locking shaft 20 with respect to the axis of the workpiece W, the groove angle θ of the V-shaped groove portion of the mounting portion 14, and the angle α+β between the first member 18a and the second member 18b of the base 18 satisfy the following relational expression: α=arcsin[sinβ / {1+sin(θ / 2)}] (1) By satisfying the following.

[0032] This relational expression (1) is derived based on the geometrical relationship shown in Fig. 8. The diagram on the left side of Fig. 8 shows a schematic diagram of a workpiece W placed on the V-shaped groove of the placement portion 14. Here, two workpieces W with different outer diameters r and R are shown in order to explain the amount of change X in the height position of the axis center and the amount of change Y in the outer peripheral position of the workpiece W caused by a change in the dimension (outer diameter) of the workpiece W. The diagrams in the middle and on the right side of Fig. 8 show a schematic diagram of the locking shaft 20 and the tip portion 20a when aligning and when locking the workpiece W.

[0033] The amount of change X in the height position of the axis and the amount of change Y in the peripheral position of the workpiece W are expressed by the following equations. X = R / sin(θ / 2) - r / sin(θ / 2) =(Rr) / sin(θ / 2) (2) Y=R+R / sin(θ / 2)-{r+r / sin(θ / 2)} =(Rr)+(Rr) / sin(θ / 2) (3) 8, the relationship between the inclination angle α of the locking shaft 20, the angle α+β between the first member 18a and the second member 18b, and the amount of change X and the amount of change Y is expressed by the following equation. Y / sinβ=X / sinα (4) By substituting equations (2) and (3), which are derived from the geometrical relationship, into equation (4), the relationship (1) can be derived.

[0034] In this way, the inclination angle α of the locking shaft 20, the groove angle θ of the V-groove portion of the mounting portion 14, and the angle α+β between the first member 18a and the second member 18b of the base 18 have a geometric relationship based on relational equation (1), so it is possible to configure a stopper 16 having the angle α of the locking shaft 20 and the angle α+β between the first member 18a and the second member 18b set in accordance with the groove angle θ of the V-groove portion.

[0035] Next, the effects of the workpiece turntable 10 according to this embodiment will be described below.

[0036] As shown in Fig. 9, the end face of the workpiece W is generally inclined with respect to the axis, i.e., it is often not perpendicular to the axis. Therefore, if the position where the tip 20a of the locking shaft 20 locks the workpiece W is misaligned with respect to the axis by the misalignment amount SA, when the workpiece W is rotated in a state where it is in contact with the tip 20a of the locking shaft 20, the workpiece W will swing along its axis, i.e., translational movement of the workpiece W will occur. For example, when the workpiece W is rotated 180 degrees as shown by the dotted line in Fig. 9, a swing of a swing amount SL occurs in the axis direction. On the other hand, according to the workpiece turntable 10 according to this embodiment, the tip 20a of the locking shaft 20 can lock the axis of the workpiece W, so that the swing of the workpiece W can be prevented or suppressed.

[0037] The workpiece turntable 10 according to the present embodiment includes a base 18 detachably disposed in the V-groove portion, a locking shaft 20 slidably disposed in the base 18 and penetrating the base 18, a longitudinal direction of which is inclined with respect to the longitudinal axis of the workpiece W, a tip end 20a of which locks the end of the workpiece W, and a stopper 16 having a stopper fixing knob 22 for fixing the locking shaft 20 to the base 18. Therefore, by sliding the locking shaft 20 inclined with respect to the longitudinal axis of the workpiece W in the base 18, the position of the tip end of the locking shaft 20 can be aligned with the position of the axis of the workpiece W placed in the V-groove portion. In addition, the aligned locking shaft 20 can be fixed to the base 18 by the stopper fixing knob 22. Therefore, it is possible to prevent or suppress the aligned locking shaft 20 from shifting. Furthermore, the base 18 for arranging the locking shaft 20 can be detachably disposed in the V-groove portion. Therefore, when aligning the locking shaft 20, it is only necessary to move the base 18 relative to the V-groove portion, and the locking shaft 20 can be aligned with the base 18 while preventing or suppressing translational movement of the workpiece W along the longitudinal direction, i.e., the axial direction. Also, the inclination angle α of the locking shaft 20 with respect to the axial center of the workpiece W is set corresponding to the groove angle θ of the V-groove portion so that the tip portion 20a of the locking shaft 20 locks the axial center of the workpiece W. Therefore, by sliding the locking shaft 20 within the base 18, the position of the tip portion 20a can be easily aligned with the axial center position of the workpiece W. This makes it easy to align the locking shaft 20 according to the dimensions of the workpiece W.

[0038] Moreover, according to the workpiece rotating table 10 of this embodiment, the base 18 includes a first member 18a and a second member 18b, one end of which is connected to each other, and the locking shaft 20 is disposed penetrating the second member 18b. Therefore, the tip 20a of the locking shaft 20 can be abutted against the cylindrical outer periphery of the workpiece W with the first mounting portion 19a of the first member 18a mounted on the V-groove portion. Furthermore, in this state, the locking shaft 20 is fixed by the stopper fixing knob 22, and the second mounting portion 19b is mounted on the V-groove portion, so that the tip 20a can lock the workpiece W at the axial position. Therefore, when aligning the locking shaft 20 with respect to the workpiece W, it is only necessary to change the position of the base 18 mounted on the V-groove portion, and the locking shaft 20 can be aligned with the base 18 while preventing or suppressing the translational movement of the workpiece W along the axial direction. This makes it possible to easily align the locking shaft 20 according to the dimensions of the workpiece W.

[0039] Furthermore, according to the workpiece turntable 10 of this embodiment, a plurality of rack grooves 28 are formed along the longitudinal direction of the V-groove portion, and cylindrical pins 30 that come into contact with the workpiece W can be disposed in the rack grooves 28. This allows the workpiece W to be stably disposed in the V-groove portion, making it possible to easily align the locking shaft 20 according to the dimensions of the workpiece W.

[0040] Moreover, the workpiece turntable 10 according to this embodiment further includes a drive roller 38 for holding the workpiece W in the V-groove portion, and a belt 40 and a pulley 42 for rotating the workpiece W placed in the V-groove portion by the drive roller 38. Therefore, the workpiece W placed in the V-groove portion can be rotated while preventing or suppressing translational movement of the workpiece W in the axial direction or radial direction.

[0041] Furthermore, according to the workpiece turntable 10 of this embodiment, the inclination angle α of the locking shaft 20 with respect to the longitudinal axis of the workpiece W, the groove angle θ of the V-groove, and the angle α+β between the first member 18a and the second member 18b of the base 18 have a geometric relationship. Therefore, the locking shaft 20 is fixed so that the tip 20a abuts on the outer periphery of the workpiece W when the first mounting portion 19a is mounted on the V-groove portion, and the second mounting portion 19b is mounted on the V-groove portion with the locking shaft 20 fixed, whereby the axial center portion of the workpiece W can be locked by the tip 20a. This makes it possible to easily align the locking shaft 20 according to the dimensions of the workpiece W.

[0042] As described above, the workpiece turntable 10 according to this embodiment can easily align the locking shaft 20 in accordance with the dimensions of the workpiece W.

[0043] Although the embodiment of the workpiece turntable 10 has been described above, the present invention is not limited to the above embodiment. It is believed that a person skilled in the art would understand that various modifications of the above embodiment are possible. [Explanation of symbols]

[0044] 10 Work turntable 12 base 14 Placement section 16 Stopper 18 Base 18a First member 18b Second member 19a First placement section 19b Second placement portion 20 Locking shaft 20a Tip 22 Stopper fixing knob (fixing mechanism) 24 Stopper holding member (fixing mechanism) 28 Rack groove portion (contact member arrangement portion) 30 Cylindrical pin (contact part) 38 Drive roller (retention mechanism) 40 Belt (rotating mechanism) 42 Pulley (rotating mechanism) Double work α Angle of inclination of the locking axis α+β Angle between the first and second members θ V-groove angle

Claims

1. A workpiece rotating table for mounting a workpiece having a cylindrical outer peripheral shape so as to be rotatable about a longitudinal axis, A base and A placement portion having a V-shaped groove formed on the base along a longitudinal direction, the workpiece being placed in the V-shaped groove; a base that is detachably disposed in the V-shaped groove; a stopper that is slidably disposed within the base and penetrates the base, the stopper having a locking shaft whose longitudinal direction is inclined with respect to the longitudinal axis of the workpiece and whose tip portion locks an end portion of the workpiece; and a fixing mechanism for fixing the locking shaft to the base; Equipped with A workpiece rotation table characterized in that the angle of inclination of the locking shaft with respect to the longitudinal axis of the workpiece is set to correspond to the groove angle of the V-shaped groove so that the tip portion of the locking shaft locks the axial center portion of the workpiece.

2. the base includes a first member and a second member connected at one end to each other; a first mounting portion that can be placed in the V-shaped groove is formed on the other end of the first member; a second mounting portion that can be placed in the V-shaped groove is formed at the other end of the second member through which the locking shaft is disposed, A workpiece rotating table as described in claim 1, wherein the engaging shaft is fixed so that the tip portion abuts the outer periphery of the workpiece when the first mounting portion is placed in the V-groove, and the second mounting portion is placed in the V-groove with the engaging shaft fixed, thereby causing the tip portion to engage the axial center portion of the workpiece.

3. The workpiece turntable according to claim 2 , wherein the V-groove is provided with a plurality of abutment member placement sections along a longitudinal direction of the V-groove, on which abutment members that come into contact with the workpiece can be placed.

4. A holding mechanism for holding the workpiece in the V-groove; The workpiece turntable according to claim 3 , further comprising a rotation mechanism for rotating the workpiece placed in the V-groove.

5. The inclination angle α of the locking shaft with respect to the longitudinal axis of the workpiece, the groove angle θ of the V-shaped groove, and the angle α + β between the first member and the second member of the base are expressed by the following relational expression: α=arcsin[sinβ / {1+sin(θ / 2)}] 5. The workpiece turntable according to claim 2, wherein the workpiece turntable is arranged so that the workpiece turntable is rotated in a direction perpendicular to the axis of rotation of the workpiece.

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