JP2014200871A - Positioning device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ensure high positioning accuracy even when a slide part exists by increasing an allowable movement range of a plug part and a tapered sleeve.SOLUTION: A positioning device includes: a movable coupling mechanism 17 for coupling a drive rod 9 so as to be unmovable in a first direction and movable in a second direction with respect to a driving force output member 11 of a hydraulic cylinder; and a guide mechanism for guiding a plug member 7 so as to be unmovable in the first direction and movable in the second direction with respect to a body member 6. The guide mechanism includes: a pair of inclined surfaces 15a that are formed parallel to the second direction on a lower end part of the plug member 7 and are inclined so as to further approach each other as going downward; and a pair of support inclined surfaces 15b formed on a cylinder member 12 so that the pair of inclined surfaces 15a are tightly engaged with each other.

Description

  In the present invention, when the work piece is positioned by fitting the plug part of the plug member and the taper sleeve of the plug member provided on the base member on the reference side into the cylindrical hole of the work, it cannot move in the first direction perpendicular to the axis of the plug part. In addition, the present invention relates to a positioning device for positioning so as to be movable in a second direction orthogonal to the first direction.

  Various types of positioning and fixing devices have been proposed and put into practical use for positioning and fixing a work pallet used for fixing, transporting and positioning of a workpiece in a machining center or the like to a table or the like of the machining center. As this type of positioning device, an omnidirectional positioning device that positions the workpiece in the X and Y directions in a horizontal plane, and a one-way positioning that allows the workpiece to be positioned only in the first horizontal direction and allows movement in other directions. The device is used.

  The distance between a pair of cylindrical holes in a workpiece causes an error between pitches when drilling. When positioning a workpiece precisely in a horizontal plane, one cylindrical hole is an omnidirectional positioning device. In order to absorb the error between pitches, the other cylindrical hole is positioned by a one-way positioning device. The present invention provides the one-way positioning device.

  The positioning device described in Patent Document 1 is formed on both sides of a main body member, a plug portion that protrudes upward from the top of the main body member, and an axis of the outer peripheral portion of the plug portion. A tapered positioning portion (tapered portion) that decreases in diameter, a tapered sleeve that is externally fitted to the plug member, and a drive rod that is inserted into the plug portion and the tapered sleeve, and the upper end portion of the tapered sleeve is integrated with the upper end portion. And a hydraulic cylinder capable of moving the drive rod up and down.

  After inserting the plug and taper sleeve into the hole in the workpiece, the drive rod is driven downward by a hydraulic cylinder, the diameter of the taper sleeve is expanded and brought into close contact with the inner peripheral surface of the hole, so that the workpiece is positioned at both positioning portions. It is configured to be positioned so as to be immovable in a first horizontal direction connecting the (tapered portions) and horizontally movable in a second direction orthogonal to the first direction.

  The positioning device described in Patent Document 2 (see FIGS. 3 and 4) has a configuration similar to that of the positioning device, but is provided with a plug member separate from the main body member, A tapered part with a smaller diameter is formed, and the sliding flange part at the lower end of the plug member is attached to the elongated hole formed in the main body member, so that the rod can be moved slightly in the horizontal direction with respect to the output member of the hydraulic cylinder. The plug member, the rod, and the taper sleeve are configured to be immovable in the first direction and horizontally movable in a second direction orthogonal to the first direction.

JP 2006-7334 A Japanese Patent No. 4799487

  In the positioning device of Patent Literature 1, the taper sleeve is moved in the second direction with respect to the plug portion so as to absorb the error between the pitches. Since the outer surface of the portion is in close contact with the inner peripheral surface of the taper sleeve, the mechanism for moving the taper sleeve in the second direction relative to the plug portion is unreasonable, and the allowable movement width of the taper sleeve cannot be increased. In addition, since the pair of positioning portions are easily worn, it is disadvantageous in terms of ensuring positioning accuracy and durability.

  In the positioning device of Patent Document 2, since the sliding flange portion of the plug member is slid with respect to the long hole formed in the main body member and absorbs the error between the pitches, a sliding gap is necessary. In addition, the wear of the sliding part during long-term use increases the sliding gap between the sliding flange part and the long hole of the main body member, and the backlash increases, increasing the positioning accuracy. Is difficult.

  An object of the present invention is to provide a positioning device that can increase the allowable movement width of the plug portion and the taper sleeve, and a positioning device that can ensure high positioning accuracy even when there is a sliding portion.

  The positioning device according to claim 1 is configured such that the plug portion of the plug member mounted on the base member on the reference side is closely fitted into the cylindrical hole of the workpiece via the taper sleeve so that the workpiece is aligned with the axis of the plug portion. In a positioning device capable of positioning in a first direction orthogonal to each other and allowing movement in a second direction orthogonal to the axial center and the first direction, a main body member fixed to the base member, and the main body member are provided. The plug member, a plug portion formed on the plug member so as to protrude from the upper end portion of the main body member, and having a tapered portion whose diameter decreases toward the upper side, and a lower half portion is externally fitted on the tapered portion. A tapered sleeve having a cylindrical outer peripheral surface and elastically deformable in the diameter increasing direction, and inserted through the plug member and the taper sleeve, and the upper end portion of the taper sleeve is aligned in the vicinity of the upper end. Connected drive rods, drive means capable of driving the drive rods up and down, and the drive rods cannot move in the first direction with respect to the drive force output member of the drive means and in the second direction A movable coupling mechanism that is movably coupled; and a guide mechanism that guides the plug member so that the plug member cannot move in the first direction and can move in the second direction with respect to the main body member. A pair of inclined surfaces formed parallel to the second direction at the lower end of the plug member and inclined so as to approach each other downward, and formed on the main body member so that the inclined surfaces are closely engaged with each other And a pair of inclined support surfaces.

  According to a second aspect of the present invention, there is provided the positioning device according to the first aspect, wherein the main body member is a cylindrical member in which the pair of support inclined surfaces are formed and is fitted and fixed in a fitting hole of the main body member. It is characterized by having.

  According to a third aspect of the present invention, there is provided the positioning device according to the second aspect of the invention, wherein the positioning device is a fixing ring that is loosely fitted to the plug member and fixed to the mounting hole at the top of the main body member. It is characterized in that a fixing ring abutting from above is provided.

  According to a fourth aspect of the present invention, there is provided the positioning device according to the third aspect of the present invention, wherein a scraper made of an elastic material that is externally fitted to the plug member and is mounted in the mounting hole and held by the fixing ring is provided to raise the drive rod. In the non-positioning state, the scraper is configured to center the plug member, the taper sleeve, and the drive rod.

  A positioning device according to a fifth aspect is the positioning device according to any one of the first to fourth aspects, wherein the movable connecting mechanism includes an engaging portion formed at a lower end portion of the driving rod, and the engaging portion is the first engaging portion. And an engagement hole formed in the driving force output member so as to be engageable from two directions and not relatively movable in the vertical direction.

  According to a sixth aspect of the present invention, in the first aspect of the invention, the valve hole formed in the bottom wall portion of the fitting hole and connected to the pressurized air supply passage, and the driving force output member of the driving means are at the lower limit position. And a valve face portion formed on the driving force output member so as to close the valve hole when the pressure reaches the pressure hole, and the driving force output member is connected via an air pressure of the pressurized air in the pressurized air supply passage. It is characterized in that a positioning failure detection means for detecting a positioning failure state that has reached the lower limit position is provided.

  According to a seventh aspect of the present invention, there is provided a positioning device according to the first aspect of the invention, wherein a head having a flange facing the plug member from above at the upper end of the drive rod, and a drive rod in the vicinity of the lower side of the head. An engagement ring fixedly fitted, and an inner groove portion of the upper end portion of the taper sleeve is engaged with an annular groove formed by the head portion and the engagement ring.

  According to an eighth aspect of the present invention, there is provided a positioning apparatus according to the fourth aspect, wherein the main body member has a pressurized air supply passage and an air blow connected to the pressurized air supply passage and capable of supplying pressurized air to the lower side of the scraper. The air passage is provided, and the pressurized air supplied from the pressurized air supply passage to the air blow air passage is ejected from the clearance between the fixing ring and the inner peripheral side of the scraper, thereby preventing foreign matter from entering. It is characterized by.

  According to the first aspect of the present invention, when the cylindrical hole of the workpiece is positioned, when the plug portion of the plug member and the taper sleeve are inserted into the cylindrical hole of the workpiece, the position of the cylindrical hole is changed in the second direction due to a manufacturing error. The plug member, the taper sleeve, and the drive rod can be moved in the second direction via the movable connecting mechanism and the guide mechanism. The cylindrical rod of the workpiece can be positioned so that the cylindrical hole of the workpiece does not move in the first direction by driving the drive rod downward by the driving means and expanding the taper sleeve.

  A guide mechanism is provided for guiding the plug member relative to the main body member so that the plug member is not movable in the first direction and movable in the second direction, and the guide mechanism is formed at the lower end portion of the plug member in parallel with the second direction. And a pair of inclined surfaces inclined so as to approach each other downward, and a pair of supporting inclined surfaces formed on the main body member so that the pair of inclined surfaces are in close contact with each other. Yes.

Therefore, the movement allowable width of the plug portion and the taper sleeve can be increased, and when the drive rod is driven to descend, the pair of inclined surfaces are surely in close contact with the pair of support inclined surfaces. Even if the sliding portions of these inclined surfaces wear, there is no backlash.
Moreover, the pair of inclined surfaces and the pair of supporting inclined surfaces also have a function of centering the plug member and the tapered sleeve in the first direction. Therefore, the cylindrical hole of the workpiece can always be positioned with high positioning accuracy.

According to invention of Claim 2, since a pair of support inclined surface is formed in a cylinder member, a pair of support inclined surface can be formed accurately.
According to the invention of claim 3, the fixing ring that is loosely fitted to the plug member is fixed to the mounting hole at the top of the main body member, and the fixing ring is brought into contact with the upper end of the cylinder member, thereby The member can be prevented from falling off.

  According to invention of Claim 4, the scraper made from the elastic material hold | maintained by the fixing ring is mounted | worn with the said mounting hole in the state fitted on the plug member, and the non-positioning state which raised the drive rod with this scraper At this time, the plug member, the taper sleeve, and the drive rod can be centered.

  According to the invention of claim 5, the movable coupling mechanism includes an engaging portion formed in the drive rod and an engaging hole formed in the driving force output member of the driving means, and the engaging portion is provided in the engaging hole. Since the engagement is possible from the second direction and the relative movement in the vertical direction is impossible, the drive rod can be connected to the drive force output member so as to be movable only in the second direction.

  According to the invention of claim 6, the valve hole is formed in the bottom wall portion of the fitting hole, and the valve surface portion that closes the valve hole when the driving force output member reaches the lower limit position is formed in the driving force output member. , Positioning failure state where the driving force output member has reached the lower limit position via the air pressure of the pressurized air supplied from the pressurized air supply passage to the valve hole by the positioning failure detection means having the valve hole and the valve face portion Can be detected.

According to the seventh aspect of the present invention, the upper end portion of the taper sleeve can be integrally connected to the upper end portion of the drive rod with a simple structure.
According to the eighth aspect of the present invention, it is possible to reliably prevent the intrusion of foreign matters by ejecting pressurized air from the clearance between the inner side of the fixing ring and the scraper.

It is a top view of the positioning system which concerns on the Example of this application. It is a top view of the 2nd positioning device. It is a disassembled perspective view of a 2nd positioning device. FIG. 4 is a sectional view taken along line IV-IV in FIG. 3 when the piston member is in the upper limit position state. FIG. 5 is a cross-sectional view taken along line VV in FIG. 3 when the piston member is in the upper limit position state. FIG. 5 is a view corresponding to FIG. 4 when the piston member is in a lower limit position state. FIG. 6 is a view corresponding to FIG. 5 when the piston member is in the lower limit position state. It is the VIII-VIII sectional view taken on the line of FIG. FIG. 5 is a view corresponding to FIG. 4 in a positioning state.

  Hereinafter, modes for carrying out the present invention will be described based on examples.

Embodiments of the present invention will be described below with reference to the drawings.
As shown in FIG. 1, the positioning system 1 accurately positions a work pallet (which corresponds to a workpiece), which is a movable member, in a horizontal direction with respect to a base member 2, which is a table of a machining center (numerically controlled machine tool). It is a device for doing.

  FIG. 1 is a plan view of a base member 2 and a plurality of positioning devices 3, 4, 5 mounted thereon. As shown in FIG. 1, the base member 1 has a first positioning device 3 for positioning a workpiece W (see FIGS. 4 and 5) set in the vicinity of the base member 1 in the X and Y directions (all directions) in a horizontal plane. And three sets of height direction positioning devices 4 for positioning the workpiece W in the Z direction (vertical direction), and a second position for positioning the workpiece W in the horizontal rotation direction (θ direction) about the first positioning device 3. A positioning device 5 is provided.

  The first positioning device 3 and the second positioning device 5 position the workpiece W in all horizontal directions. The description of the first positioning device 3 and the height direction positioning device 4 will be omitted, and the second positioning device 5 will be described below.

  Next, the 2nd positioning device 5 which is the positioning device of this application is demonstrated based on FIGS. 4 and 5 show a state in which the piston member 22 of the hydraulic cylinder 16 is at the upper limit position, and FIGS. 6 and 7 show a state in which the piston member 22 of the hydraulic cylinder 16 has made a full stroke and has reached the lower limit position. Indicates. FIG. 9 shows a normally positioned state. In this state, the piston member 22 of the hydraulic cylinder 16 is in the middle position between the upper limit position and the lower limit position.

  As shown in FIGS. 1 to 5, the second positioning device includes a main body member 6 fixed to the base member 2 on the reference side, a plug member 7, a taper sleeve 8, a drive rod 9, and an engagement ring. 10, a driving force output member 11, a cylindrical member 12, a fixing ring 13, a scraper 14, a guide mechanism 15, a hydraulic cylinder 16, a movable connection mechanism 17, a positioning failure detection means 18, and an air blow mechanism 19. Etc.

  After the plug portion 7a of the plug member 7 is inserted from below into the cylindrical hole H at the bottom of the workpiece W through the taper sleeve 8, the diameter of the taper sleeve 8 is expanded and brought into close contact with the cylindrical hole H, thereby forming the cylindrical hole of the workpiece W. It is a device that positions H in the Y direction orthogonal to the X direction. The Y direction corresponds to a horizontal first direction orthogonal to the axis of the plug portion 7a, and the X direction corresponds to a horizontal second direction orthogonal to the axis of the plug portion 7a and the first direction.

  The main body member 6 has a fixing flange portion 6a and a cylindrical portion 6b, and the lower surface of the flange portion 6a is formed on a horizontal reference plane. The cylindrical portion 6b is mounted in a cylindrical hole 2a formed in the base member 2 with the axis centered in a vertical posture, and the three bolt holes 6c are in a state where the lower surface of the flange portion 6a is in contact with the upper surface of the base member 2. The main body member 6 is positioned and fixed to the base member 2 with high accuracy by the fixing bolts 6d respectively inserted into the base member 2.

  The plug member 7 is mounted on the main body member 6 so as to be movable in the X direction. A plug portion 7 a is formed in the upper half of the plug member 7, and the plug portion 7 a protrudes upward from the central portion of the main body member 6. The outer peripheral surface of the plug part 7a is formed as a taper part that becomes smaller in diameter toward the upper side. The plug member 7 includes a flange portion 7c at a lower end portion, a cylindrical portion 7b extending upward from the flange portion 7c, and the plug portion 7a. A rod hole 7d is formed in a central portion of the plug member 7.

  The taper sleeve 8 has an outer peripheral surface formed in a cylindrical surface and an inner peripheral surface formed in a taper surface, and the lower half portion of the taper sleeve 8 is externally fitted to the taper portion of the plug portion 7a so as to expand in diameter. It is configured to be elastically deformable in the direction. As shown in FIG. 3, in order to enable the elastic deformation, one longitudinal slit 8a is formed at one circumferential position of the taper sleeve 8, and the taper sleeve 8 is divided by the longitudinal slit 8a. .

  At a position corresponding to the vertical slit 8a, one small-diameter pin member 7e is mounted in a protruding manner on the taper portion of the plug portion 7a, and the tip of the pin member 7e is engaged with the vertical slit 8a. Thus, the taper sleeve 8 is regulated so as not to rotate around the axis of the plug portion 7a with respect to the plug portion 7a.

  The drive rod 9 drives the taper sleeve 8 to move up and down. The drive rod 9 is concentric with the plug portion 7 a, and the drive rod 9 is inserted into the rod hole 7 d of the plug member 7 in close contact with the taper sleeve 8. Is also inserted. The drive rod 9 has a head portion 9a formed at the upper end portion, and a rod main body portion 9b that is integrally formed with the head portion 9a and extends downward. The head portion 9a is formed with a flange portion 9c that faces the plug member 7 from above. The head portion 9a is trapezoidal in a side view and has a tapered outer peripheral surface 9d. This tapered outer peripheral surface 9d is used when the head portion 9a, the plug portion 7a, and the tapered sleeve 8 are inserted into the cylindrical hole H of the workpiece W. It functions as a guide surface.

An inner flange portion 8b projecting inward is formed at the upper end portion of the taper sleeve 8, and the engagement ring 10 is fixed to the upper end portion of the rod main body portion 8b by shrink fitting or press fitting.
The head 9a and the engagement ring 10 form an annular groove 10a, and the inner flange 8b at the upper end of the taper sleeve 8 is tightly engaged with the annular groove 10a. In this way, the upper end portion of the taper sleeve 8 is integrally connected to the vicinity of the upper end of the drive rod 9, and the lifting drive force of the hydraulic cylinder 16 is connected to the taper sleeve 8 via the drive force output member 11 so as to be able to be transmitted. .

  When the drive rod 9 is raised, the taper sleeve 8 is raised by a few millimeters relative to the plug portion 7a, and when the drive rod 9 is lowered, the taper sleeve 8 is lowered by a few millimeters relative to the plug portion 7a.

The cylindrical member 12 corresponds to a part of the main body member 6, and the cylindrical member 12 is closely attached to a fitting hole 20 formed in the main body member 6.
An anti-rotation pin 12d is mounted at one location on the outer periphery of the cylindrical member 12, and the anti-rotation pin 12d is engaged with a semi-cylindrical groove (not shown) formed at one location on the outer periphery of the fitting hole 20 of the body member 6. By doing so, the cylindrical member 12 is regulated so as not to rotate.

  A mounting hole 21 having a diameter larger than that of the fitting hole 20 is formed on the upper end portion of the main body member 6 above the fitting hole 20. A fixing ring 13 having an L-shaped cross section is fixed to the mounting hole 21 by shrink fitting or press fitting, and is in contact with the upper ends of the pair of projecting portions 12b of the cylindrical member 12. Therefore, the cylindrical member 12 does not fall off. An annular scraper 14 made of an elastic material such as a soft synthetic resin is externally fitted to the plug member 7 in a close contact manner, and is attached to the fixing ring 13 and fixed.

  The guide mechanism 15 guides the plug member 7 such that it cannot move in the Y direction and can move in the X direction with respect to the main body member 6. The guide mechanism 15 has a pair of inclined surfaces 15a formed in parallel to the X direction at the lower end portion of the plug member 7 and inclined so as to approach each other downward, and these inclined surfaces 15a engage in close contact with each other. A pair of inclined support surfaces 15b formed on the cylindrical member 12 is provided. The pair of inclined surfaces 15 a are formed as cut surfaces obtained by partially cutting off both side portions of the flange portion 7 c of the plug member 7.

  A large-diameter portion 11a of the driving force output member 11 is closely attached to the central hole 12a of the cylindrical member 12, and the both side portions of the cylindrical member 12 in the Y direction protrude in a plan view higher than the central hole 12a. An arcuate protrusion 12b is formed. The pair of support inclined surfaces 15b are formed on the inner side surfaces of the pair of projecting portions 12b. As shown in FIGS. 3 to 5, the pair of arcuate surfaces 12 c of the cylindrical member 12 are at a position lower by several mm than the lower ends of the pair of support inclined surfaces 15 b.

  A hydraulic cylinder 16 as a driving means for driving the drive rod 9 up and down is provided at the lower part of the main body member 6. The hydraulic cylinder 16 has a vertically oriented cylinder hole 21 formed in the cylindrical portion 6b of the main body member 6, and a piston member 22 including a piston portion 22a mounted in the cylinder hole 21 so as to be movable up and down. A first oil chamber 21a for lowering the drive rod 9 is formed above the piston portion 22a in the hole 21, and a second oil for raising the drive rod 9 is formed below the piston portion 22a. A chamber 21b is formed.

  The first oil chamber 21a is connected to a hydraulic pressure supply source 24 through a hydraulic passage 23a in the main body member 6, a hydraulic passage 23b in the base member 2, and an external hydraulic passage 23c. The second oil chamber 21b is connected to a hydraulic pressure supply source 24 via a hydraulic passage 25a in the base member 2 and an external hydraulic passage (not shown). Seal members 26 to 28 and other seal members 29 for sealing the hydraulic pressures of the first and second oil chambers 21a and 21b are provided.

  The driving force output member 11 includes a large-diameter portion 11a attached to the central hole 12a of the cylindrical member 12, and a leg portion 11b extending downward from the central portion of the lower end of the large-diameter portion 11a. The leg portion 11b is formed in a bolt shape, and the leg portion 11b is connected to the rod portion 22b of the piston member 22 of the hydraulic cylinder 16 by screwing.

  The movable connecting mechanism 17 connects the lower end portion of the driving rod 9 to the driving force output member 11 that outputs the driving force of the hydraulic cylinder 16 so as not to move in the Y direction and to move in the X direction. It is. The movable connecting mechanism 17 includes an engagement portion 17a formed at the lower end portion of the drive rod 9, and a drive force output member that can engage the engagement portion 17a from one side in the X direction and cannot move in the vertical direction. 11 and an engagement hole 17b formed in the large-diameter portion 11a.

The engaging portion 17a has an annular groove 30a formed in the vicinity of the lower end of the drive rod 9, and a flange portion 30b on the lower side of the annular groove 30a. The engagement hole 17b is a U-shaped hole in plan view that opens to the first positioning device 3 side, and allows passage of the U-shaped protrusion 31a in plan view that engages with the annular groove 30a and the flange 30b. And a U-shaped guide groove 31b in plan view.
Here, in order to allow the drive rod 9 to move in the X direction with respect to the drive force output member 11, the engagement portion 17a is engaged with the shaft center of the piston member 22 and the shaft center of the drive rod 9 being aligned. A slight gap (for example, 0.3 to 0.5 mm) is formed between the wall surfaces of the holes 17b.

  4 and 5 show a state in which the piston member 22 of the hydraulic cylinder 16 is at the upper limit position. In this state, a ring of several mm is formed between the lower surface of the engagement ring 10 and the upper end surface of the plug portion 7a. There is a gap a, a part of the upper end surface of the driving force output member 11 abuts on a part of the lower end surface of the plug member 7, and the lower end surface of the large diameter portion 11 a of the driving force output member 11 and the fitting hole 20. There is an annular gap b of several mm between the bottom surface. There is also a gap c between the arc-shaped outer peripheral surface 7 f of the flange portion 7 c of the plug member 7 and the peripheral wall surface of the fitting hole 20. There is also an annular gap d between the outer peripheral surface of the plug member 7 and the fixing ring 13.

Next, the positioning failure detection means 18 will be described.
When the hole diameter of the cylindrical hole H of the workpiece W is larger than the outer diameter of the taper sleeve 8 in the expanded state, the piston rod 22 and the driving force output are not correctly positioned even if the drive rod 9 is driven downward. The member 11 is lowered to the lower limit position. The positioning failure detection means 18 for detecting the positioning failure includes a valve hole 34 formed in the bottom wall portion of the fitting hole 20 and a valve surface portion 35 formed in the driving force output member 11.

  The body member 6 is provided with a pressurized air supply passage 36 connected to the valve hole 34, and the pressurized air supply passage 36 is pressurized by an air passage 37 and an external air passage 38 formed in the base member 2. A pressure switch 40 (or pressure sensor) is connected to the air supply source 39 and the external air passage 38. The pressurized air supply source 39 and the pressure switch 40 are electrically connected to the control unit 41. The end portion of the pressurized air supply passage 36 is sealed with a seal member 32.

  The valve surface portion 35 is formed so as to close the valve hole 34 when the driving force output member 11 reaches the lower limit position. As shown in FIG. 9, when the drive rod 9 is driven downward and the taper sleeve 8 expands in diameter and comes into close contact with the cylindrical hole H to reach a normal positioning state, the drive force output member 11 does not reach the lower limit position. In this case, since the pressurized air supplied to the pressurized air supply passage 36 leaks upward through the gap between the driving force output member 11 and the cylindrical member 12, the air pressure is “low” by the pressure switch 40. Is detected.

  As shown in FIG. 6, when the driving force output member 11 has reached the lower limit position, the valve hole 34 is blocked by the valve surface portion 35, so that the air pressure “high” is detected by the pressure switch 40. Therefore, it is possible to detect a poor positioning state in which the driving force output member 11 reaches the lower limit position via the air pressure of the pressurized air in the pressurized air supply passage 36.

  Next, the air blow mechanism 19 that blows pressurized air from the gap 42 between the outer peripheral surface of the plug member 7 and the scraper 14 (this is formed by elastic deformation of the scraper 14) will be described. As shown in FIG. 5, the main body member 6 includes a pressurized air supply passage 43 and an air introduction passage 44 that is continuous with the pressurized air supply passage 43 and that can introduce pressurized air to the lower surface side of the fixing ring 13. The pressure air supplied from the pressurized air supply passage 43 to the air introduction passage 44 is ejected from the gap between the outer peripheral surface of the plug member 7 and the scraper 14 so as to prevent foreign matter such as chips from entering. It is configured.

The air supply passage 43 includes an inclined air passage 43 a and a vertical groove 43 b formed on the outer peripheral side of the fitting hole 20. The air supply passage 43 is connected to an air supply source 39 through an air passage 45 in the base member 2 and an external air passage.
The air introduction passage 44 includes a gap e between the circular arc surface 12c of the cylindrical member 12 and the lower surface of the plug member 7, an annular gap c, and a gap between the flange portion 7c of the plug member 7 and the fixing ring 13. An annular gap d and an annular gap f inside the scraper 14 are formed. Note that the end of the inclined air passage 43 a is sealed with a seal member 33.

Next, the function and effect of the second positioning device 5 will be described.
When the workpiece W is positioned by the first and second positioning devices 3 and 5, when the plug portion 7a and the taper sleeve 8 of the second positioning device 5 are inserted into the cylindrical hole H, the cylinder corresponding to the first positioning device 3 is used. When there is a pitch error between the hole and the cylindrical hole H corresponding to the second positioning device 3, it is inserted while being guided by the guide action of the tapered outer peripheral surface 9 d of the head 9 a of the drive rod 9.

  At this time, the drive rod 9 moves in the X direction relative to the drive force output member 11 via the movable coupling mechanism 17, and the plug member 7 and the taper sleeve 8 output drive force via the guide mechanism 15. It moves relative to the member 11 and the cylindrical member 12 in the X direction to absorb the pitch error.

  Moreover, when hydraulic pressure is supplied to the first oil chamber 21a of the hydraulic cylinder 16 to drive the drive rod 9 downward, the pair of inclined surfaces 15a are engaged with the pair of support inclined surfaces 15b in close contact with each other, and the plug In a state where the member 7 is supported so as not to move downward, the head 9a of the drive rod 9 is driven to move the taper sleeve 8 relatively downward with respect to the plug portion 7a, and the diameter of the taper sleeve 8 is expanded to form a cylinder. The holes H are fitted in close contact. Thus, the cylindrical hole H of the workpiece W can be accurately positioned in the Y direction.

  Moreover, in this positioning state, the pair of inclined surfaces 15a always engage closely with the pair of support inclined surfaces 15b, so that the plug member 7 and the taper sleeve 8 do not rattle in the Y direction. , Y-direction positioning accuracy can be maintained high. Further, since the pair of inclined surfaces 15a and the pair of support inclined surfaces 15b have a function of centering the plug member 7, the Y-direction positioning accuracy can be maintained high. Moreover, even if the inclined surface 15a and the support inclined surface 15b are worn during long-term use, the pair of inclined surfaces 15a always engage closely with the pair of support inclined surfaces 15b. Directional positioning accuracy is not reduced.

  Moreover, when the drive rod 9 is raised to the non-positioning state, the driving force output member 11 pushes up the plug member 7 to release the taper lock of the pair of inclined surfaces 15a and the pair of support inclined surfaces 15b. Therefore, the plug member 7 and the taper sleeve 8 can easily slide. Since the pair of support inclined surfaces 15b are formed in the cylindrical member 12 separate from the main body member 6, the pair of support inclined surfaces 15b can be formed with high accuracy.

Since the positioning failure detection means 18 having a simple configuration including the valve hole 34 and the valve face portion 35 can reliably detect the positioning failure, the reliability is excellent.
In addition, since the air blow mechanism 19 is provided and the pressurized air is ejected from the inner circumferential side gap of the scraper 14, it is ensured that foreign matters such as chips enter the inside of the second positioning device 5 (inside the scraper 14). Can be prevented. Moreover, the plug member 7, the taper sleeve 8, and the drive rod 9 can be centered by the elastic force of the scraper 14 in the non-positioning state in which the drive rod 9 is raised.

Next, an example in which the above embodiment is partially changed will be described.
(1) The drive means is not limited to a hydraulic cylinder, and may be constituted by a fluid pressure cylinder such as a hydraulic cylinder or an air cylinder.
(2) The cylindrical member 12 may be configured as a member integrated with the main body member 6.
(3) The shape and structure of the main body member 6 are not limited to those shown in the drawings, and can be configured in various shapes and structures.

(4) The hydraulic passage 23b, the air passages 37, 45, and the like can be formed in the main body member 6. (5) In addition, those skilled in the art can implement the present invention in a form in which various modifications are added without departing from the spirit of the present invention.

  It is possible to provide a one-way positioning device that can be used in a positioning system that accurately positions a workpiece to be machined, a workpiece pallet for fixing the workpiece, or the like on a base member.

DESCRIPTION OF SYMBOLS 1 Positioning system 2 Base member 3 1st positioning device (omnidirectional positioning device)
5 Second positioning device (unidirectional positioning device)
6 Main body member 7 Plug member 7a Plug portion 8 Taper sleeve 8b Inner flange portion 9 Drive rod 9a Head portion 9c flange portion 10 Engagement ring 11 Drive force output member 12 Tube member 13 Fixing ring 14 Scraper 15 Guide mechanism 15a Inclined surface 15b Support Inclined surface 16 Hydraulic cylinder (drive means)
17a engagement portion 17b engagement hole 18 positioning failure detection means 19 air blow mechanism 20 fitting hole 21 mounting hole 34 valve hole 35 valve face portion 36 pressurized air supply passage 43 pressurized air supply passage 44 air introduction passage

Claims (8)

The workpiece can be positioned in the first direction perpendicular to the axis of the plug portion by fitting the plug portion of the plug member mounted on the base member on the reference side into the cylindrical hole of the workpiece in close contact with the taper sleeve. And a positioning device that allows movement in a second direction orthogonal to the axis and the first direction,
A body member fixed to the base member;
A plug member provided in the main body member, and a plug portion provided with a tapered portion formed on the plug member so as to protrude from an upper end portion of the main body member and having a smaller diameter toward the upper side;
A taper sleeve having a lower half portion externally fitted to the taper portion and having a cylindrical outer peripheral surface and capable of being elastically deformed in a diameter expansion direction;
A drive rod that is inserted through the plug member and the taper sleeve, and the upper end portion of the taper sleeve is integrally connected to the vicinity of the upper end;
Drive means capable of driving the drive rod up and down;
A movable coupling mechanism that couples the driving rod to the driving force output member of the driving means so as not to move in the first direction and to move in the second direction;
A guide mechanism that guides the plug member so as not to move in the first direction and to move in the second direction relative to the body member;
The guide mechanism includes a pair of inclined surfaces formed in parallel to the second direction at the lower end of the plug member and inclined so as to approach each other downward, and the pair of inclined surfaces are in close contact with each other. A positioning device comprising: a pair of support inclined surfaces formed on the main body member so as to match with each other.   2. The positioning according to claim 1, wherein the main body member includes a cylindrical member formed with the pair of support inclined surfaces and fitted and fixed in a fitting hole of the main body member. apparatus.   A fixing ring externally fitted to the plug member and fixed to a mounting hole at the top of the main body member, wherein a fixing ring abutting from above is provided on the upper end of the cylindrical member. The positioning device according to claim 2.   A scraper made of an elastic material that is externally fitted to the plug member and mounted in the mounting hole and held by the fixing ring is provided. When the drive rod is lifted, the scraper removes the plug member and the taper sleeve. The positioning device according to claim 3, wherein the driving rod is configured to be centered.   The movable connecting mechanism is formed on the driving force output member with an engaging portion formed at a lower end portion of the driving rod, and the engaging portion is engageable from the second direction and is not relatively movable in the vertical direction. The positioning device according to any one of claims 1 to 4, further comprising an engagement hole.   The valve hole formed in the bottom wall portion of the fitting hole and connected to the pressurized air supply passage, and the drive so as to close the valve hole when the driving force output member of the driving means reaches the lower limit position. A positioning failure detecting means for detecting a positioning failure state in which the driving force output member has reached a lower limit position via the air pressure of the pressurized air in the pressurized air supply passage. The positioning device according to claim 1, further comprising: A head portion having a flange facing the plug member from above at an upper end portion of the drive rod, and an engagement ring externally fixed to the drive rod in the vicinity of the lower side of the head portion;
The positioning device according to claim 1, wherein an inner flange portion of an upper end portion of the tapered sleeve is engaged with an annular groove formed by the head portion and an engagement ring. The main body member is provided with a pressurized air supply passage, and an air introduction passage that is continuous with the pressurized air supply passage and is capable of introducing pressurized air on the lower surface side of the fixing ring,
The intrusion of foreign matter is prevented by ejecting pressurized air supplied from the pressurized air supply passage to the air introduction passage through a gap between the outer peripheral surface of the plug member and the scraper. 4. The positioning device according to 4.