JP5672943B2 - Lock mechanism and workpiece positioning jig using the same - Google Patents

Description

  The present invention relates to a lock mechanism that locks a plurality of action members arranged in a circumferential direction in synchronization with each other in the radial direction, and a workpiece positioning jig using the lock mechanism.

  When supplying a work to a machine tool such as a lathe, the work is temporarily placed on a work placement portion that is remote from the machine tool, and then the work is conveyed to the machine tool by a loader device. The workpiece placement unit is provided with a workpiece positioning jig for aligning and holding the workpiece so that the loader chuck of the loader device can correctly grip the workpiece. The workpiece positioning jig is provided with a plurality of (for example, three) guide rods arranged in the circumferential direction so that the position of the guide rod can be adjusted in the radial direction, and each guide rod abuts the outer peripheral surface inside the plurality of guide rods. The work is positioned by placing the work in contact with each other. Conventional workpiece positioning jigs generally adjust the radial position of each guide rod one by one.

  However, adjusting the radial position of each guide rod one by one requires time for the adjustment work, so that each guide rod is moved in the radial direction in synchronization with each other (for example, patents). References 1, 2). However, these workpiece positioning jigs also have a configuration in which each guide rod is individually fixed to the adjusted radial position using a fastening tool such as a bolt and a nut.

Japanese Patent No. 2630178 Japanese Patent Application Laid-Open No. 11-70437

  For this reason, when adjusting the position of the guide rod in accordance with the workpiece, it is necessary to perform the work of loosening and tightening the fastener for each guide rod, and the efficiency of the position adjustment work is poor. In addition, the necessity of a tool for operating the fastening tool has made the operation cumbersome. This is not a big problem when processing the same kind of workpieces continuously, but it becomes a big problem when the number of setup changes increases in multi-product and small-lot production.

An object of the present invention is to provide a lock mechanism that can securely and easily lock a plurality of action members whose positions can be adjusted in the radial direction at arbitrary radial positions without using a tool.
Another object of the present invention is to provide a workpiece positioning jig that can easily adjust the position of each guide rod without using a tool.
Still another object of the present invention is to ensure that each screwing member of the lock mechanism can be rotated in a synchronized manner by the rotation operation means.

The locking mechanism of the present invention includes a plurality of action members that are circumferentially aligned with each other and that are radially adjustable with respect to the center of the arrangement, a sun gear that is positioned at the center of the arrangement of the plurality of action members, A carrier rotatable around the rotation center of the sun gear, and the radial position of the rotation center is regulated by the carrier, and the same number of planetary gears as the operation members that mesh with the sun gear and respectively support the plurality of operation members. A locking mechanism that locks the movement of the action member in the radial direction, a screw member positioned at the rotation center of the planetary gear, a screwing member that is screwed with the screw member, and each screwing member. Rotation operation means for rotating in synchronization with each other, and by changing the screwing amount of the screw member and the screwing member by the rotation operation means, the planetary gear is sandwiched between friction members on both sides and is ground. To generate a force, and as to lock the radial movement of said working member.

  According to this configuration, the screwing amount between the screw member and the screwing member is changed by rotating the screwing members in synchronization with each other by the rotation operation means. Accordingly, the planetary gear is sandwiched between the friction members on both sides to generate a frictional force, and the movement of the acting member in the radial direction is locked by the frictional force. Since the lock mechanism having this configuration can simultaneously lock the movement of all the action members in the radial direction by operating the rotation operation means, the position adjustment work of the action members is simple.

The workpiece positioning jig of the present invention includes a workpiece mounting member on which workpieces are stacked, a plurality of guide rods that are arranged on the outer periphery of the workpiece mounting portion of the workpiece mounting member and can be adjusted in the radial direction, A synchronization position adjusting mechanism that adjusts the position of the guide rods in the radial direction in synchronization with each other; and a lock mechanism that locks the radial movement of each guide rod. a sun gear located, and rotatable carrier around the rotational center of the sun gear, the radial position of the center of rotation is regulated by the the carrier, guide for supporting each of said plurality of guide rods meshing with the sun gear and a rod as many of the planetary gears, wherein the locking mechanism comprises a threaded member located at the rotation center of the planetary gear, the screw member to the screw member and screwed, the A rotating operation means for rotating the combined member in synchronization with each other, and by changing the screwing amount of the screw member and the screwing member by the rotating operation means, the planetary gear is sandwiched between the friction members on both sides. A frictional force is generated to lock the radial movement of the guide rod.

  According to this configuration, the guide rods are adjusted in the radial direction in synchronization with each other by the synchronous position adjusting mechanism having the sun gear, the carrier, and the planetary gear. Further, the movement of the guide rod in the radial direction is locked by the lock mechanism having the screw member, the screwing member, and the rotation operation means. The lock mechanism changes the screwing amount between the screw member and the screw member by rotating the screw members in synchronization with each other by the rotation operation means. Accordingly, the planetary gear is sandwiched between the friction members on both sides to generate a frictional force, and the radial movement of the guide rod is locked by the frictional force. Since the lock mechanism having this configuration can simultaneously lock the radial movement of all the guide rods by operating the rotation operation means, the position adjustment work of the guide rods is simple. Moreover, no tool is required for the position adjustment work of the guide rod.

  For example, the rotation operation means includes: an operation member provided so as to be rotatable by protruding from the upper surface of the work placement member; and a first rotation operation gear attached to the operation member; A second rotation operation gear that meshes with the first rotation operation gear and is rotatable about the rotation center of the sun gear, and has a smaller diameter than the second rotation gear that rotates integrally with the second rotation operation gear. It is preferable to include a third rotation operation gear and a fourth rotation operation gear that meshes with the third rotation operation gear and rotates together with the screw member. The screwing member and the fourth rotation operation gear may be integrated or separate.

  When the operation member is rotated, the rotation operation means configured as described above is transmitted to the second rotation operation gear from the first rotation operation gear attached to the operation member. The third rotation operation gear that rotates integrally is transmitted to the fourth rotation operation gear. Thereby, the screwing member rotates integrally with the fourth rotation operation gear. Therefore, it is possible to lock the movement of all guide rods in the radial direction by rotating each screwing member only by rotating one operating member. Since the operation member is provided so as to protrude from the upper surface of the workpiece placement member, the operation is easy. In addition, since the third rotation operation gear has a smaller diameter than the second rotation operation gear, the third rotation operation gear and the fourth rotation operation gear can be arranged in a limited space.

The locking mechanism of the present invention includes a plurality of action members that are circumferentially aligned with each other and that are radially adjustable with respect to the center of the arrangement, a sun gear that is positioned at the center of the arrangement of the plurality of action members, A carrier rotatable around the rotation center of the sun gear, and the radial position of the rotation center is regulated by the carrier, and the same number of planetary gears as the operation members that mesh with the sun gear and respectively support the plurality of operation members. A locking mechanism that locks the movement of the action member in the radial direction, a screw member positioned at the rotation center of the planetary gear, a screwing member that is screwed with the screw member, and each screwing member. Rotation operation means for rotating in synchronization with each other, and by changing the screwing amount of the screw member and the screwing member by the rotation operation means, the planetary gear is sandwiched between friction members on both sides and is ground. By generating a force and locking the movement of the action member in the radial direction, a plurality of action members whose positions can be adjusted in the radial direction can be reliably and easily locked at any radial position without using a tool. .

The workpiece positioning jig of the present invention includes a workpiece mounting member on which workpieces are stacked, a plurality of guide rods that are arranged on the outer periphery of the workpiece mounting portion of the workpiece mounting member and can be adjusted in the radial direction, A synchronization position adjusting mechanism that adjusts the position of the guide rods in the radial direction in synchronization with each other; and a lock mechanism that locks the radial movement of each guide rod. a sun gear located, and rotatable carrier around the rotational center of the sun gear, the radial position of the center of rotation is regulated by the the carrier, guide for supporting each of said plurality of guide rods meshing with the sun gear and a rod as many of the planetary gears, wherein the locking mechanism comprises a threaded member located at the rotation center of the planetary gear, the screw member to the screw member and screwed, the A rotating operation means for rotating the combined member in synchronization with each other, and by changing the screwing amount of the screw member and the screwing member by the rotating operation means, the planetary gear is sandwiched between the friction members on both sides. Since the friction force is generated to lock the radial movement of the guide rod, the position of each guide rod can be easily adjusted without using a tool.

  An operation member provided so that the rotation operation means protrudes from the upper surface of the workpiece mounting member and is rotatable, a first rotation operation gear attached to the operation member, and the first rotation operation gear. A second rotation operation gear that is rotatable around the rotation center of the sun gear, and a third rotation operation gear having a smaller diameter than the second rotation gear that rotates integrally with the second rotation operation gear, In the case where the fourth rotation operation gear meshes with the third rotation operation gear and rotates integrally with the screwing member, the rotation operation means reliably synchronizes each screwing member of the lock mechanism. Rotated.

It is a front view of the workpiece positioning jig concerning one Embodiment of this invention. It is a top view of the workpiece positioning jig. FIG. 3 is a sectional view taken along line III-III in FIG. 1. It is IV-IV sectional drawing of FIG. It is VV sectional drawing of FIG. It is VI-VI sectional drawing of FIG. It is VII-VII sectional drawing of FIG. It is a top view which shows the state which positioned the workpiece | work of the workpiece | work positioning jig.

An embodiment of the present invention will be described with reference to FIGS.
As shown in FIG. 1 and FIG. 2, the workpiece positioning jig is brought into contact with a workpiece mounting member 1 on which workpieces are stacked, and an outer periphery of the workpiece stacked on the workpiece mounting member 1. And a plurality of (three in this embodiment) guide rods 2 for positioning the workpiece. The workpiece mounting member 1 is plate-shaped, and the same number of rod insertion holes 3 as the guide rods 2 are formed radially. The guide rod 2 has a round bar shape that is long in the vertical direction, and is provided through the rod insertion hole 3.

  Below the workpiece mounting member 1, a guide plate 5, an intermediate plate 6, and a base plate 7 having a planar shape substantially the same shape and the same size as the workpiece mounting member 1 are provided so as to overlap each other at a predetermined interval. It has been. The mutual space between the plates 5, 6 and 7 is maintained by the collars 8 and 9 interposed at a plurality of locations (for example, 3 locations) at the planar position. Further, the workpiece placing member 1 is supported by the heads of the height adjusting bolts 10 screwed into the collars 8 and 9 and the sun center shaft 24 (FIG. 5) described later from above, and the collars of these height adjusting bolts 10 are supported. The height of the workpiece placing member 1 is adjusted by changing the screwing amount to the 8, 9 and the sun center shaft 24.

  The guide plate 5 is provided with a radial guide hole 12 at the same plane position as the rod insertion hole 3. The lower end of the guide rod 2 penetrates the radial guide hole 12 and extends below the guide plate 5. A synchronous position adjusting mechanism 20 is provided in the space between the guide plate 5 and the intermediate plate 6 to adjust the position of each guide rod 2 in the radial direction along the radial guide hole 12 in synchronization with each other. Further, in the space between the intermediate plate 6 and the base plate 7, a main part of a lock mechanism 40 that locks the radial movement of each guide rod 2 that is an action member is provided.

  As shown in FIG. 3, the synchronization position adjusting mechanism 20 includes a sun gear 21 positioned at the center of the alignment of the guide rods 2, a carrier 22 rotatable around the rotation center O <b> 1 of the sun gear 21, and the carrier 22, the radial position of the rotation center O <b> 2 is regulated, and there are the same number of guide rods 2 that mesh with the sun gear 21, that is, three planetary gears 23. Due to the restriction of the radial position by the carrier 22, the rotation center O <b> 2 of the planetary gear 23 is always located on the circumferential orbit C that is a fixed distance from the rotation center O <b> 1 of the sun gear 21. The planetary gear 23 is a gear having teeth formed only on a part of the outer periphery. The guide rod 2 is fixed by a stud bolt 13 at a position where the lower end of the guide rod 2 is eccentric from the rotation center O2 of the planetary gear 23.

  As shown in FIG. 5, the sun gear 21 and the carrier 22 are respectively provided on the outer periphery of a cylindrical solar center shaft 24 fixed to the guide plate 5, the intermediate plate 6 and the base plate 7. 26 is rotatably supported via 26. The sun gear 21 is slidable with respect to the intermediate plate 6 by the bush 25, and the carrier 22 is slidable with respect to the sun gear 21 by the bush 26.

  As shown in FIG. 6, the planetary gear 23 is rotatably supported on the outer periphery of the planetary center shaft 27 provided on the carrier 22 via a bush 28 having an L-shaped cross section. The planetary gear 23 is slidable with respect to the intermediate plate 6 by bushes 29 provided at a plurality of locations on the outer periphery of the rotation center O2, and the carrier 22 is slidable with respect to the planetary gear 23 by the bushes 28. The guide plate 5 and the intermediate plate 6 are provided with arc-shaped circumferential guide holes 30 and 31 (FIGS. 2 and 3) for guiding the planetary center shaft 27, respectively.

  Between the carrier 22 and the guide plate 5, the same number of washers 33 as the planetary gears 23, that is, three washers 33 are interposed at positions overlapping the planetary gears 23. A parallel pin 34 horizontally penetrated in the upper part of the planetary center shaft 27 engages with a pin groove 33a of the washer 33, and the washer 33 rotates integrally with the planetary center shaft 27. The washer 33 is substantially H-shaped in plan, and is screwed into the screw hole 35 of the carrier 22 in one of a pair of recesses 33b located on the inner peripheral side and the outer peripheral side with respect to the rotation center O1 of the sun gear 21. The eccentric disc 36 is engaged. In each of the washers 33 in the illustrated example, the eccentric disk 36 is engaged with the concave portion 33b on the outer peripheral side. The positional relationship between the recess 33b of the washer 33 and the screw hole 35 of the carrier 22 is shifted in the circumferential direction between the inner peripheral side and the outer peripheral side. The eccentric disc 36 is for adjusting the phase around the rotation center O2 of the washer 33 so that the torque acting on each planetary gear 23 becomes the same when the radial position of the guide rod 2 is adjusted. . The detailed operation of the eccentric disc 36 will be described later.

  The locking mechanism 40 is shown in FIGS. The lock mechanism 40 synchronizes the planetary center shaft 27 that is a screw member, the fourth rotation operation gear 54 that is a screwing member that is screwed into the planetary center shaft 27, and the fourth rotation operation gears 54. And rotating operation means 42 for rotating.

The rotation operation means 42 is provided on the outer peripheral side with respect to the maximum work W _max (FIG. 2) that can be positioned by the work positioning jig, and the operation member 43 (FIG. 7) whose upper part protrudes from the upper surface of the work placement member 1. Have The operation member 43 is rotatable by fitting a cylindrical shaft portion 45 fixed to the intermediate plate 6 with a bolt 44 into a cylindrical hole 43a that opens downward. Further, the operation member 43 is prevented from coming off upward by the retaining bolt 46 screwed into the upper and lower intermediate portions engaged with the lower surface of the guide plate 5.

  A first rotation operation gear 47 is attached to the shaft portion 45. Specifically, a first rotation operation gear 47 is rotatably fitted to the outer periphery of the shaft portion 45 via a bush 48 having an L-shaped cross section, and the first rotation operation gear 47 and the operation member 43 are connected in a round shape. A bar-like key 49 is connected so as to be able to transmit rotation to each other. The bush 48 also has a role of slidably supporting the first rotation operation gear 47 with respect to the base plate 7.

  As shown in FIG. 4, the first rotation operation gear 47 meshes with a second rotation operation gear 50 that is rotatable around the rotation center O <b> 1 of the sun gear 21. The second rotation operation gear 50 is a sector gear having a larger diameter than the first rotation operation gear 47. A third rotation operation gear 51 having a smaller diameter than the second rotation operation gear 50 is provided integrally with the second rotation operation gear 50. The second rotation operation gear 50 and the third rotation operation gear 51 are rotatably fitted to the outer periphery of the sun center shaft 24 by means of bushes 52 and 53 (FIG. 5) having an L-shaped cross section, and the intermediate plate 6. The base plate 7 is slidable with respect to the base plate 7. The third rotation operation gear 51 meshes with the three fourth rotation operation gears 54.

  As shown in FIG. 6, the fourth rotation operation gear 54 that is a screwing member has a screw hole 54a at the center, and a screw portion provided at the lower end of the planetary center shaft 27 that is a screw member in the screw hole 54a. 27a is screwed. That is, the fourth rotation operation gear 54 is screwed to the lower end of the planetary center shaft 27. In this embodiment, the fourth rotation operation gear 54 is a screwing member. However, a screwing member (not shown) that rotates integrally with the fourth rotation operation gear 54 is provided separately from the fourth rotation operation gear 54. The screw member and the screw member (planet center shaft 27) may be screwed together. Further, a screw hole (not shown) may be provided in the screw member, and a screw portion (not shown) to be screwed into the screw hole may be provided in the screw member.

  In the case of this embodiment, the screw portion 27a and the screw hole 54a are reverse screws having screw grooves cut in the opposite direction to a general screw. Therefore, when the fourth rotation operation gear 54 rotates counterclockwise as viewed from below, the screwing proceeds. That is, the fourth rotation operation gear 54 is raised. The screw portion 27a and the screw hole 54a may be general screws instead of reverse screws.

  The lock mechanism 40 has the above-described configuration. When the operation member 43 is rotated in a predetermined direction (in this embodiment, clockwise in FIG. 2), the rotation is rotated from the first rotation operation gear 47 to the second rotation. It is transmitted to the operation gear 50 and further transmitted from the third rotation operation gear 51 that rotates together with the second rotation operation gear 50 to each fourth rotation operation gear 54. When the operation member 43 is rotated clockwise in FIG. 2, the fourth rotation operation gear 54 rotates counterclockwise as viewed from below. Then, screwing of the screw portion 27a of the planetary center shaft 27 and the screw hole 54a of the fourth rotation operation gear 54 proceeds, and the fourth rotation operation gear 54 rises. Accordingly, the intermediate plate 6, the planetary gear 23, and the washer 33 are sandwiched between the parallel pin 34 and the fourth rotation operation gear 54. Thereby, a frictional force is generated between the planetary gear 23 and the intermediate plate 6 and the washer 33 on both sides thereof, and the rotation of the planetary gear 23 around the rotation center O2 is restricted. As a result, the radial movement of the guide rod 2 is locked. That is, the intermediate plate 6 and the washer 33 function as a friction member that pinches the planetary gear 23 from both sides and generates a frictional force.

  When the operation member 43 is rotated in the reverse direction (in this embodiment, counterclockwise in FIG. 2), each part of the lock mechanism 40 operates in the reverse direction as described above, and the lock of each guide rod 2 is released.

  Each washer 33 and eccentric disc 36 are adjusted during assembly so that the torque acting on each planetary gear 23 becomes the same when the operation member 43 is rotated. Specifically, by adjusting the direction of the eccentric disk 36 and changing the phase around the rotation center O2 of the washer 33, all the planetary gears 23 are clamped by the intermediate plate 6 and the washer 33 at the same timing. . In FIG. 3, the eccentric disk 36 is engaged with the concave portion 33 b on the outer peripheral side of the washer 33, but the center of rotation of the washer 33 can also be obtained by engaging the eccentric disc 36 with the concave portion 33 b on the inner peripheral side. The phase around O2 changes. The phase around the rotation center O <b> 2 of the washer 33 can be appropriately set by performing the selection of the concave portion 33 b with which the eccentric disc 36 is engaged and the adjustment of the direction of the eccentric disc 36.

The workpiece positioning jig is a workpiece positioned on the inner peripheral side of each guide rod 2 on the upper surface of the workpiece mounting member 1 in a state where each guide rod 2 indicated by a chain line in FIGS. 1 and 2 is radially expanded. The workpieces W (FIG. 8) are stacked on the placement location. In this state, when the guide rods 2 are pushed inward in the radial direction by hand or the like, the guide rods 2 are synchronously moved along the radial guide holes 12 toward the inner diameter side by the action of the synchronization position adjusting mechanism 20. . All guide rods 2 are always in the same radial position. As shown in FIG. 8, the workpiece W is accurately centered and positioned at the position where each guide rod 2 is in contact with the outer periphery of the workpiece W. FIG. 2 shows the maximum work W _max and the minimum work W _min that can be positioned.

  When the workpiece W is positioned, the movement of each guide rod 2 in the radial direction is locked by the lock mechanism 40. The radial movement of all the guide rods 2 can be locked only by rotating one operating member 43. Since the operation member 43 is provided so as to protrude from the upper surface of the workpiece mounting member 1, the operation is easy. Since the screw portion 27a and the screw hole 54a are reverse screws, the lock operation of the operation member 43 is clockwise, and it is easy to be familiar with it sensuously. In addition, since the third rotation operation gear 51 has a smaller diameter than the second rotation operation gear 50, the third rotation operation gear 51 and the fourth rotation operation gear 54 can be arranged in a limited space. it can.

DESCRIPTION OF SYMBOLS 1 ... Work mounting member 2 ... Guide rod (action member)
6. Intermediate plate (friction member)
20 ... Synchronization position adjusting mechanism 21 ... Sun gear 22 ... Carrier 23 ... Planetary gear 27 ... Planetary center shaft (screw member)
33 ... Washer (friction member)
DESCRIPTION OF SYMBOLS 40 ... Lock mechanism 42 ... Rotation operation means 43 ... Operation member 47 ... 1st rotation operation gear 50 ... 2nd rotation operation gear 51 ... 3rd rotation operation gear 54 ... 4th rotation operation gear (screwing member)
O1 ... Sun gear rotation center O2 ... Planetary gear rotation center W ... Workpiece

Claims (3)

A plurality of action members that are circumferentially aligned with each other and that are adjustable in radial direction with respect to the center of the arrangement, a sun gear that is positioned at the center of the arrangement of the plurality of action members, and a rotation center of the sun gear A rotatable carrier, and a radial position of the rotation center is regulated by the carrier, and has the same number of planetary gears as meshing with the sun gear and supporting the plurality of action members, respectively . A locking mechanism that locks radial movement,
A screw member positioned at the rotation center of the planetary gear, a screwing member that is screwed with the screw member, and a rotation operation unit that rotates the screwing members in synchronization with each other. A lock that locks the movement of the working member in the radial direction by changing the amount of screwing between the screw member and the screwing member so that the planetary gear is sandwiched between the friction members on both sides to generate a frictional force. mechanism. A workpiece mounting member on which workpieces are stacked, a plurality of guide rods arranged on the outer periphery of the workpiece mounting portion of the workpiece mounting member and adjustable in the radial direction, and the guide rods synchronized with each other in the radial direction A synchronous position adjustment mechanism that adjusts the position of the guide rod, and a lock mechanism that locks the radial movement of each guide rod,
The synchronous position adjusting mechanism includes a sun gear positioned at the center of each guide rod, a carrier rotatable around the rotation center of the sun gear, and a radial position of the rotation center regulated by the carrier. A planetary gear having the same number of guide rods that mesh with the sun gear and respectively support the plurality of guide rods;
The lock mechanism includes a screw member positioned at the rotation center of the planetary gear, a screw member that is screwed with the screw member, and a rotation operation unit that rotates the screw members in synchronization with each other. By changing the screwing amount between the screw member and the screwing member by the rotation operation means, the planetary gear is sandwiched between the friction members on both sides to generate a frictional force and lock the radial movement of the guide rod. Work positioning jig to be used.   The rotation operation means includes an operation member that is protruded from the upper surface of the work placement member and is rotatably provided, a first rotation operation gear attached to the operation member, and the first rotation operation gear. A second rotation operation gear that is rotatable around the rotation center of the sun gear, and a third rotation operation gear having a smaller diameter than the second rotation gear that rotates integrally with the second rotation operation gear, The work positioning jig according to claim 2, further comprising: a fourth rotation operation gear that meshes with the third rotation operation gear and rotates integrally with the screwing member.

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