JP2009023027A - Workpiece holding device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To stably provide large fixing force regardless of the shape of a workpiece without needing a spring of special shape while securing sufficient durability in a workpiece holding device. <P>SOLUTION: A link unit 22 is provided between a fixed member 18 and a movable member 20. The link unit 22 comprises a turning base 24 contacting the fixed member 18, and a first intermediate link 26, a plurality of intermediate links 28, and a plurality of turnable mouthpieces 30. The first intermediate link 26 is turnably engaged with the turning base 24 through a turning base side projecting part 36 of circular arc cross section. Each second intermediate link 28 is turnably engaged with the first intermediate link 26 through a second intermediate link side long projecting part 48 of circular arc cross section. Each turnable mouthpiece 30 is turnably engaged with each second intermediate link 28 through a second intermediate link side short projecting part 50 of circular arc cross section. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a workpiece holding device that can clamp a workpiece between a fixed member and a movable member.

  Conventionally, in order to perform machining such as cutting on a workpiece, that is, a workpiece, it has been considered to hold the workpiece by a workpiece holding device called a vise. For example, in a material development site for automobile parts such as a connecting rod of a piston that is a workpiece, the strength of the current material may be tested according to a predetermined standard such as a JIS standard. For example, it is conceivable to confirm the actual market situation by testing material strength and the like with a small lot of automobile parts called number parts. It is also conceivable to take out a mass-produced part or an automobile part such as a market-recovered product and perform the same test as above. In such a case, it is necessary to cut out the material of the investigation site from the automobile part, and to perform machining such as cutting and grinding to the shape of the test piece specified or specified in the cut out material. It is necessary to hold the material cut out from the workpiece holding device.

  Conventionally known workpiece holding devices generally allow a workpiece to be held between a fixed member and a movable member. Further, the movable member is moved linearly with respect to the fixed member. The base on the fixed member side and the base on the movable member side have flat surfaces parallel to each other, and the workpiece is sandwiched between both flat surfaces.

  In the case of a machine vice corresponding to the workpiece holding device described in Patent Document 1, a rotatable pin is provided in a hole formed in a vise attachment base fixed to the machine vise body, and the base is fixed to the pin. ing. The machine vise is said to be able to fasten a workpiece having a tapered surface by rotating a base.

  In addition, the workpiece holding device described in Patent Document 2 can clamp the workpiece between the movable pusher block and the fixed base, and the pusher block is coupled to the holder block. It is elastically connected and supported by bolts and springs. In addition, a plurality of pin groove holes are provided on the holding surface of the pusher block, and pins are inserted into the pin groove holes so that the side portions of the pins protrude from the holding surface to the surface. The direction can be changed freely. And even if it is a workpiece which has an unshaped end surface shape by rough cut, it is supposed that a pressing force can be reliably applied to a workpiece via a pin.

  In addition, in the universal vice claw described in Patent Document 3, several vice claws and bearing balls are inserted into metal hollow boxes on both sides of a deformed product so that the vice claws protrude. When pressing a deformed object, several vice claws and a large number of bearing balls move freely according to the deformed object, and the vice claw is evenly pressed and the deformed object can be pressed with an equal force. Has been.

JP-A-9-277133 JP-A-2005-14121 Japanese Utility Model Publication No. 7-27757

  An automobile part or a material cut out from an automobile part may have an irregular irregular shape such as a corrugated shape on a reference surface such as a side surface. For this reason, when holding a material cut out by a generally known workpiece holding device, holding a material having a high-precision right-angle shape or parallel surface shape like a rectangular parallelepiped with high shape accuracy Unlikely, the base on the fixed member side and the base on the movable member side cannot be evenly contacted with each other at a portion having a large area of a flat surface parallel to each other, and the fixing force, that is, grasping when machining is performed. It may not be possible to get enough power.

  For example, FIG. 10 is a schematic diagram showing a state in which the cutting material 10 obtained by cutting from a connecting rod of a piston, which is a workpiece, by a conventionally known workpiece holding device is held. The cut material 10 has a substantially H shape when viewed from one side in the left-right direction in FIG. As shown in the figure, such a cut material 10 has a surface that contacts the fixed side base 12 and the movable side base 14 with rough irregularities, and is a flat surface having a high degree of parallelism. Absent. For this reason, when the cut-out material 10 is held in the fixed side base 12 and the movable side base 14, the cut-out material 10 is formed between the fixed side base 12 and the movable side base 14, as shown by a one-dot chain line portion in FIG. 10. The parallel flat surface can be brought into contact with only a fixed portion having a small area such as one point portion or two point portions, and the fixing force of the cutting material 10 to the workpiece holding device is sufficiently increased. I can't.

  For example, as illustrated in FIG. 10, a gap δ is generated between the fixed base 12 and the side surface of one end portion (right end portion in FIG. 10) of the cut material 10. For this reason, in a state where the cut material 10 is held by the workpiece holding device, the cut material 10 can be machined such as by cutting only with a small force, that is, with a light force, and the machining takes a lot of time. there is a possibility. For example, there is a possibility that the amount of cutting once for the cut material 10 may be small, and in order to make the cut material 10 in a desired shape, the number of times of cutting may be increased. In this case, machining takes a long time. Under such circumstances, it is desired to realize a workpiece holding device capable of holding a workpiece with a sufficiently large force regardless of the shape of the workpiece such as the cut material 10.

  On the other hand, in the case of the machine vise described in Patent Document 1, when the workpiece has a simple and uniformly inclined tapered surface, the workpiece may be held with a certain amount of force. It cannot be said that there is no. However, when the pin for inclining the base attached to the vise attachment base with respect to the vise attachment base has a simple cylindrical shape, when the workpiece is held by the machine vise, the engagement portion including the pin Since a large force is applied from various directions, the durability of the engaging portion including the pin may be reduced.

  Moreover, in the case of the workpiece holding device described in Patent Document 2, it cannot be said that there is no possibility that the direction of the movable pusher block can be changed with respect to the holder block. It is necessary to use a specially shaped spring with a reduced diameter.

  In addition, in the case of the universal vice claw described in Patent Document 3, when a deformed product is pressed, a large number of bearing balls in the metal hollow box may be displaced and a sufficient fixing force may not be stably obtained. There is. In addition, a workpiece holding device that holds a workpiece following the fixed surface by entering and exiting a plurality of movable pins is also considered for a workpiece having an irregularly shaped fixed surface that is irregularly shaped. However, if there is no restraining force in the vertical direction of the means for holding the movable pin, there is a possibility that loosening occurs during processing and the processing becomes impossible.

  INDUSTRIAL APPLICABILITY The present invention can sufficiently secure durability in a workpiece holding device, does not require a specially shaped spring, and can stably obtain a large fixing force regardless of the shape of the workpiece. The purpose is to do so.

  Among the workpiece holding devices according to the present invention, the workpiece holding device according to the first invention is a workpiece holding device capable of holding a workpiece between a fixed member and a movable member. A first intermediate link that is pivotably engaged by a protrusion having an arcuate cross section with respect to one member of the fixed member and the movable member or another member that contacts the one member; A swivel base that is pivotally engaged with a second other member connected to the first intermediate link by a projecting portion having an arcuate cross section and that contacts the workpiece. It is a workpiece holding device.

  Preferably, the turning center between the first intermediate link and the swivel base is located on a virtual plane where the contact surface of the swivel base with respect to the workpiece is located.

  More preferably, the plurality of swivel bases are pivotably engaged with the first intermediate link or the second other member connected to the first intermediate link by the protrusions having an arcuate cross section.

  More preferably, the second intermediate member connected to the first intermediate link or the first intermediate link and the swivel base in a direction orthogonal to the pressing direction of the swivel base against the workpiece. Engaged by arcuate engagement portions provided at two positions on both ends, each arcuate engagement portion is pivotable with the first intermediate link or the second other member connected to the first intermediate link. It is configured by engaging a hole having a circular arc section provided on one side with a base and a protrusion having a circular arc section provided on the other side.

  The workpiece holding device according to the first invention preferably includes a second intermediate link connected so as to be pivotably engaged with the first intermediate link by a protrusion having an arcuate cross section, The swivel base is slidably engaged with the second intermediate link by the projecting portion having a circular arc cross section.

  More preferably, the turning center of the first intermediate link, the second intermediate link, and the swivel base is located on a virtual plane where the contact surface of the swivel base with respect to the workpiece is located.

  More preferably, the plurality of second intermediate links are pivotably engaged with the first intermediate link, and the plurality of pivot bases are pivotally engaged with the respective second intermediate links.

  A workpiece holding device according to a second invention is a workpiece holding device capable of sandwiching a workpiece between a fixed member and a movable member, and is between the fixed member and the movable member. A removable link unit is provided, and the link unit contacts one of the fixed member and the movable member when the first direction, the second direction, and the third direction orthogonal to each other are defined. A turning base as another member having a contact surface and a turning base side protrusion having an arcuate cross section provided at both ends in the first direction; and provided at both ends in the first direction of one end in the second direction; A first intermediate link side elongated hole portion having a circular arc shape that engages with the turning base side protrusion, and a first intermediate link having a circular arc shape provided at both ends in the first direction at a plurality of locations in the second direction other end portion. With a short side hole, and turnable by the turn base side protrusion with respect to the turn base A first intermediate link to be joined, a second intermediate link side long protrusion having an arc-shaped cross section that is provided at both ends in the first direction of the one end portion in the second direction and engages with the first intermediate link side short hole portion, A second intermediate link-side long protrusion having an arc-shaped cross section provided at both ends in the first direction at a plurality of positions on the other end in the two directions, and a second intermediate link-side long protrusion with respect to the first intermediate link A plurality of second intermediate links, which are second other members connected so as to be pivotably engaged with each other, and are provided at both ends in the first direction and engage with the second intermediate link side short protrusions. A plurality of swivel bases having a base side hole portion having a circular arc shape in cross section, pivotably engaged with the second intermediate link by the second intermediate link side short protrusion, and contacting the workpiece; The center of rotation of the first intermediate link, each second intermediate link, and each swivel base is the swivel base with respect to the workpiece. A workpiece holding device, characterized in that the surface erosion is positioned on a virtual plane located.

  According to the workpiece holding device according to the present invention, the first intermediate link or the second other member connected to the first intermediate link is pivotally engaged by the protrusion having an arcuate cross section, Since it has a swivel base that comes into contact with the workpiece, when the swivel base is pressed against the work piece, the swivel base can easily turn along the shape of the work piece, regardless of the shape of the work piece. The swivel base can be easily brought into contact with the workpiece with a large contact area. For this reason, a large fixing force to the workpiece can be stably obtained regardless of the shape of the workpiece. In addition, since the engaging portion between the second intermediate member or the second other member connected to the first intermediate link and the swivel base includes a projecting portion having an arcuate cross section, regardless of the swiveling of the swivel base. The contact area with the mating member engaged with the swivel base can be increased, and sufficient durability can be ensured even when the fixing force to the workpiece is increased. Further, unlike the workpiece holding device described in Patent Document 2, it is not necessary to use a spring having a special shape.

  Further, according to the configuration in which the turning center between the first intermediate link and the swivel base is located on a virtual plane where the contact surface of the swivel base with respect to the work piece is located, the swivel base is pressed against the work piece. In this case, the swivel base can be hardly displaced with respect to the workpiece. For this reason, the fixing force with respect to a workpiece can be enlarged irrespective of the shape of a workpiece. Further, in a configuration in which the turning center between the first intermediate link and the swivel base is located on a virtual plane where the contact surface of the swivel base with respect to the workpiece is located, the first intermediate link or the first intermediate link is connected. When the plurality of swivel bases are configured to be swivelably engaged with the second other member formed by the protrusion having an arcuate cross section, the swivel is performed despite the plurality of swivel bases. It is possible to effectively prevent the universal caps from approaching and interfering with each other. Further, in the case of the machine vise described in Patent Document 1, when the workpiece has a complicated taper surface or an uneven surface including an irregular corrugated shape, the machine vise base is used as the workpiece. However, it may not be possible to sufficiently contact the workpiece and the fixing force of the machine vise to the workpiece may not be sufficiently increased.

  Further, according to the configuration in which the plurality of swivel bases are pivotably engaged with the first intermediate link or the second other member connected to the first intermediate link by the projecting portion having the circular arc section, the workpiece It is easy to turn a plurality of swivel bases corresponding to the shape of multiple parts of the object, and even if the work piece has a complicated shape such as a wavy shape, the contact area between the swivel base and the work piece Can be made larger, and the fixing force to the workpiece can be made larger.

  Further, the first intermediate link or the second other member connected to the first intermediate link and the swivel base have two end portions in a direction orthogonal to the pressing direction of the swivel base against the workpiece. The arc-shaped engaging portions are engaged with each other, and each arc-shaped engaging portion is one of the first intermediate link or the second other member connected to the first intermediate link and the swivel base. According to the configuration configured by engaging the hole with the circular arc section provided in the cross section and the protrusion with the circular arc section provided in the other, it is orthogonal to the pressing direction of the swivel base to the workpiece. Even if the contact area between the swivel base and the workpiece is increased by increasing the dimension in the direction, the hole provided on one side of the mating member and the projecting part provided on the other side Swivel cap for workpieces regardless of the gap between Rattling and loosening can be sufficiently suppressed.

[First Embodiment]
Hereinafter, embodiments according to the present invention will be described in detail with reference to the drawings. 1 to 8 show a workpiece holding device according to a first embodiment of the present invention. FIG. 1 is a main part perspective view showing a state in which a workpiece is held by the workpiece holding device. FIG. 2 is a view of the link unit taken out from FIG. 1 and viewed from above. FIG. 3 is a view from the left side to the right side of FIG. FIG. 4 is a view showing the swivel base taken out from FIG. FIG. 5 is a diagram showing the first intermediate link extracted from FIG. FIG. 6 is a diagram showing one second intermediate link extracted from FIG. FIG. 7 is a view showing one swivel base extracted from FIG. FIG. 8 is a view of the state in which the cut material is held by the workpiece holding device as viewed from above.

  As shown in FIG. 1, a workpiece holding device, that is, a vise, includes a fixed member 18 and a movable member 20 for sandwiching a workpiece (workpiece) 16 therebetween. The workpiece holding device enables the workpiece 16 to be sandwiched between the fixed member 18 and the movable member 20 via the link unit 22. The movable member 20 can move in the horizontal direction with respect to the fixed member 18 by a moving mechanism (not shown).

  The moving mechanism is, for example, a feed screw mechanism, and supports the movable member 20 by a guide unit (not shown) so that the movable member 20 can be displaced only in a far-and-short direction relative to the fixed member 18. A feed screw mechanism is configured by screwing a screw member having a threaded portion on the surface. The screw member can be rotated by operating a handle (not shown). By rotating the screw member by the handle, the movable member 20 is moved far and away with respect to the fixed member 18 as the screw member rotates. Note that the present invention is not limited to such a configuration in which the movable member 20 is moved manually with respect to the fixed member 18 as described above. For example, the movable member 20 is automatically moved with respect to the fixed member 18 using a motor or the like. It is good also as a structure to which it moves far and near.

  Further, the workpiece holding device includes a link unit 22 detachably provided between the fixed member 18 and the movable member 20. As shown in FIGS. 2 and 3, the link unit 22 enables integral handling. The link unit 22 is another member that is in contact with the fixing member 18, a turning base 24, a first intermediate link 26, A plurality of (two in the illustrated example) second intermediate links 28 and a plurality of (four in the illustrated example) swivel bases 30 as the second other members are provided. The first intermediate link 26 is engaged with the turning base 24 so as to be turnable around a predetermined turning center O1 described later. Each of the second intermediate links 28 is engaged with the first intermediate link 26 so as to be rotatable about predetermined turning centers O2 and O3 described later. In addition, two swivel caps 30 are engaged with each first intermediate link 26 so as to be swivel around predetermined swivel centers O4, O5, O6, and O7, which will be described later.

  More specifically, when the z direction, the y direction, and the x direction, which are a first direction, a second direction, and a third direction orthogonal to each other, are defined, as shown in FIG. The pin insertion hole 32 provided at both ends in the x direction at one end in the y direction (upper end in FIG. 4) and the y direction and the x direction at the other end in the y direction (lower end in FIG. 4) And a partial circular groove 34 provided on both end faces of the z direction (front and back direction in FIG. 4) and a circular arc cross section provided at the other end of the partial circular groove 34 in the y direction (lower end part in FIG. 4). And a turning base side protrusion 36. The pin insertion hole 32 penetrates the turning base 24 in the z direction. Further, the outer peripheral edge of the partial circular groove 34 has an arc shape. Further, one end surface (the upper end surface in FIG. 4) of the turning base 24 in the y direction is a contact surface 38 that can be brought into contact with the fixing member 18 (FIG. 1). Such a turning base 24 can also be configured by stacking a plurality of turning base elements that are separated in the z direction.

  In addition, as shown in FIG. 3, the first intermediate link 26 connects a plurality of locations on the outer peripheral portion of a pair of semicircular portions 40 provided on both sides in the z direction by column portions 42. Further, as shown in FIG. 5, the first intermediate link 26 is provided at both ends in the z direction (front and back directions in FIG. 5) corresponding to the semicircular portions 40 at one end in the y direction (upper end in FIG. 5). The first intermediate link side long hole 44 having an arcuate cross section that can be engaged with the turning base side protrusion 36 (FIG. 4) and the two ends in the x direction at the other end in the y direction (lower end in FIG. 5). The first intermediate link side short hole portions 46 each having an arcuate cross section provided at both ends in the z direction corresponding to the semicircular portions 40. Such a first intermediate link 26 is engaged with the turning base 24 (FIG. 4) by a turning base side projection 36 so as to be turnable. The first intermediate link side long hole 44 is larger than the turning base side protrusion 36 (FIG. 4) with respect to the length in the arc direction.

  Moreover, each 2nd intermediate link 28 is provided in the z direction (front and back direction of FIG. 6) both ends of the y direction one end part (upper end part of FIG. 6), as shown in FIG. The second intermediate link side long protrusion 48 having an arc cross section that can be engaged with the hole 46 (FIG. 5), and the two ends in the z direction at both ends in the x direction at the other end in the y direction (lower end in FIG. 6). And a second intermediate link side short protrusion 50 having a circular arc cross section provided at two portions, a total of four portions. Each such second intermediate link 28 is pivotally engaged with the first intermediate link 26 at two positions on the other side in the y direction (lower side in FIG. 5) by the second intermediate link side long protrusion 48. It connects with the 1st intermediate link 26 so that it may make. The first intermediate link side short hole 46 (FIG. 5) is larger than the second intermediate link side long protrusion 48 with respect to the length in the arc direction.

  Further, as shown in FIGS. 3 and 7, each swivel base 30 has a contact surface 54 in which the ends of a pair of substantially semicircular end plate portions 52 are in contact with the workpiece 16 (FIG. 1). Are connected by a connecting plate portion 56 having Further, a protrusion 58 is provided at the end of the end plate portion 52 on one side so that one surface of the protrusion 58 and the contact surface 54 are flush with each other. Further, each swivelable base 30 has a circular arc-shaped base side that can be engaged with the second intermediate link side short protrusion 50 (FIG. 6) at the two z-direction both ends corresponding to each end plate part 52. A hole 60 is provided. Then, two turnable caps 30 are engaged with each second intermediate link 28 by the second intermediate link side short protrusion 50 so as to be turnable. The base side hole 60 is larger than the second intermediate link side long protrusion 48 (FIG. 6) with respect to the length in the arc direction.

  In addition, each base-side hole 60 and each second intermediate link-side short protrusion 50 constitute a plurality of arc-shaped engaging portions. That is, each of the second intermediate links 28 and each of the swivelable caps 30 are provided at both end portions in the z direction, which is a direction orthogonal to the y direction, which is the pressing direction of the swivelable cap 30 against the workpiece 16 (FIG. 1). The arcuate engaging portions are engaged with each other by arc-shaped engaging portions provided at two positions, and the arc-shaped engaging portions are provided in the base side hole portion 60 provided in the rotatable base 30 and the second intermediate link 28. It is configured by engaging the intermediate link side short protrusion 50.

  Further, as shown in FIG. 2, the turning centers O1, O2, O3, O4, O5, O6, O7 (hereinafter referred to as O1-) of the first intermediate links 26, the respective second intermediate links 28, and the respective rotatable bases 30. O7) is positioned on a virtual plane α on which the contact surface 54 of the rotatable base 30 with respect to the workpiece 16 (FIG. 1) is located. That is, the turning base side protrusion 36 provided on the turning base 24, the first intermediate link side long hole portion 44 and the first intermediate link side short hole portion 46 provided on the first intermediate link 26, and the second intermediate links 28. The arc center O1-O7 of each of the provided second intermediate link side long protrusion 48, the second intermediate link side short protrusion 50, and the base side hole 60 provided in each swivel base 30 is connected to each swivel base 30. The contact surface 54 is positioned on the virtual plane α in a state where the contact surface 54 is positioned on the same virtual plane α.

  The operation of holding the workpiece 16 by such a workpiece holding device will be described in the case where the workpiece 16 is the cut material 10 cut out from the connecting rod of the piston as shown in FIG. First, a cutting material 10 as shown in FIG. 8 is obtained by cutting the connecting rod by cutting or the like. The shape of the cut material 10 is the same as that shown in FIG. Next, the link unit 22 is disposed so that the contact surface 38 of the turning base 24 contacts the side surface of the fixed member 18 (FIG. 1) facing the movable member 20 (FIG. 1).

  When necessary, for example, a floor plate (not shown) is fixed or connected to the lower side or the upper side of the swing base 24 so that the height of the swivel base 24 is small and the difference from the height of the side surface of the fixing member 18 is large. It is also possible to raise the height of the swivel base 24 including so that it is substantially the same as the height of the side surface of the fixing member 18. For example, the turning base 24 and the floor plate can be connected by passing a pin (not shown) inserted into the pin insertion hole 32 of the turning base 24 through the pin insertion hole formed in the floor plate.

  Next, as shown in FIG. 8, the cut material 10 is disposed so as to contact the side surface of the movable member 20. In this case, either one of the members can be raised so that the height of the cut material 10 and the height of the swivel base 30 are substantially matched. Next, when the movable member 20 is brought close to the fixed member 18 (FIG. 1) manually or automatically, the cut material 10 is pressed against the contact surface 54 of the swivel base 30 as shown in FIG. The cut material 10 is held between the movable member 20 via the link unit 22. In this case, the first intermediate link 26 pivots with respect to the pivot base 24 so that the contact surface 54 of the pivotable base 30 follows the shape of the side surface of the cut material 10, and each second intermediate link 28 is a first intermediate link. 26, and each swivel base 30 is turned with respect to the second intermediate link 28. In this case, the turning centers O4, O5, O6, and O7 of the respective swivelable caps 30 are the center in the width direction of the contact surface 54 of each swivelable cap 30.

  According to such a workpiece holding device, the first intermediate link 26 that is slidably engaged with the slewing base 24 having a circular arc cross section with respect to the slewing base 24 that contacts the fixed member 18, and the first A workpiece 16 (such as a cut material 10 (FIG. 8)) that is pivotably engaged with a second intermediate link side long protrusion 48 having a circular arc cross section with respect to a second intermediate link 28 connected to the intermediate link 26. 1) and a swivelable cap 30 in contact with. Therefore, when each swivel base 30 is pressed against the workpiece 16, each swivel base 30 can be easily swung along the shape of the work 16, and each swivel base 30 is placed on the work 16. It becomes easy to contact with a large contact area. For this reason, a large fixing force to the workpiece 16 can be stably obtained regardless of the shape of the workpiece 16. Further, since the engaging portion between the second intermediate link 28 connected to the first intermediate link 26 and the swivel base 30 includes the second intermediate link side short protrusion 50 having a circular arc cross section, each swivel base Regardless of the rotation of 30, the contact area between each swivel base 30 and the second intermediate link 28, which is a mating member, can be increased, and even when the fixing force to the workpiece 16 is increased, the durability is sufficient. Can be secured. Further, unlike the workpiece holding device described in Patent Document 2, it is not necessary to use a spring having a special shape.

  Further, the turning centers O1, O4, O5, O6, and O7 between the first intermediate link 26 and the respective swivelable caps 30 are on a virtual plane α on which the contact surface 54 of each swivelable cap 30 with respect to the workpiece 16 is located. Therefore, when each swivel base 30 is pressed against the workpiece 16, each swivel base 30 can be hardly displaced with respect to the work 16. That is, it is difficult to apply a force that directs the contact surface 54 of the swivelable base 30 in a different direction while the workpiece 16 is pressed against the swivelable base 30. For this reason, the fixing force with respect to the workpiece 16 can be increased regardless of the shape of the workpiece 16. Further, the turning centers O1, O4, O5, O6, and O7 between the first intermediate link 26 and each of the swivelable caps 30 are located on a virtual plane α where the contact surface 54 of the swivelable cap 30 is located, and the first Since the plurality of swivel bases 30 are pivotally engaged with the second intermediate link 28 connected to the intermediate link 26 by the second intermediate link side short protrusion 50 having a circular arc cross section, the swivel base Despite the fact that there are a plurality of 30, it is possible to effectively prevent the swivelable caps 30 from approaching and interfering with each other.

  Further, since the plurality of swivel bases 30 are pivotally engaged with the second intermediate link 28 by the second intermediate link side short protrusion 50 having a circular arc cross section, a plurality of portions on the side surface of the workpiece 16 are provided. The plurality of swivelable bases 30 can be easily swung in accordance with the shape of each of the swiveling bases, and even when the cut material 10 as the workpiece 16 has a complicated shape such as a corrugated shape as shown in FIG. The contact area between the universal base 30 and the cutout material 10 can be increased, and the fixing force for the cutout material 10 can be increased. That is, in the case where the cut material 10 is held by the conventional workpiece holding device shown in FIG. 10 described above, the number of contact points of the cut material 10 with respect to the fixed base is as small as one point, and the contact area is small. On the other hand, in the present embodiment, as shown by the one-dot chain line β portion in FIG. 8, the number of contact points of the swivel base 30 can be increased to 4 points and the contact area can be increased.

  Further, the second intermediate link 28 connected to the first intermediate link 26 and each swivel base 30 are directions perpendicular to the pressing direction of each swivel base 30 against the workpiece 16. The second intermediate link side short protrusion 50 having an arcuate cross section provided on the second intermediate link 28, and an arcuate engagement portion that is engaged with the arcuate engagement portions provided at two positions on both ends of the second intermediate link 28; It is configured by engaging a base side hole 60 having a circular arc cross section provided in the swivel base 30. For this reason, by increasing the dimension in the direction perpendicular to the pressing direction of the swivelable base 30 to the workpiece 16, that is, in the z direction, the height of each swivel base 30 and the workpiece 16 is increased. Even when the contact area is increased, rattling and loosening of each swivel base 30 with respect to the workpiece 16 regardless of the existence of a gap between the base side hole 60 and the second intermediate link side short protrusion 50. Can be suppressed sufficiently.

[Second Embodiment]
FIG. 9 is a view corresponding to FIG. 2 and showing a workpiece holding device according to a second embodiment of the present invention. In the case of the first embodiment shown in FIG. 2, the link unit 22 includes the turning base 24, the first intermediate link 26, the second intermediate link 28, and the turnable base 30. In the present embodiment, members corresponding to the second intermediate link 28 (see FIG. 2) are omitted from the link unit 22a. That is, the link unit 22a constituting the workpiece holding device of the present embodiment includes a turning base 24a, a first intermediate link 26a, and a plurality of (two in the illustrated example) swivel bases 30. Is provided. The swivel base 24a has a substantially U-shaped cross section that opens downward in FIG. 9, and is provided with swivel base side holes 62 having a circular arc cross section at both ends in the front and back direction of FIG. The first intermediate link 26a has the same structure as the second intermediate link 28 constituting the link unit 22 of the first embodiment shown in FIG. That is, the first intermediate link 26a is provided at both ends in the front and back direction of the upper end portion of FIG. 9, and the first intermediate link side long protrusion 64 having a circular arc cross section that can be engaged with the turning base side hole 62, The first intermediate link side short protrusion 66 having a circular arc cross section provided at a total of four locations, two at both the front and rear direction both ends at the two left and right end portions at the lower end portion of 9. The first intermediate link 26a is engaged with the turning base 24a by the first intermediate link side long protrusion 64 so as to be turnable. Further, two swivel caps 30 can be swiveled by a first intermediate link side short protrusion 66 having an arc cross section and a base side hole 60 having an arc cross section with respect to each first intermediate link 26a. Engaged.

  As described above, in the present embodiment, the structure is such that the first base link 26a and the plurality of swivel caps 30 are linked to the swivel base 24a in two stages. In the case of this embodiment, the swivel base that is pivotably engaged with the first intermediate link 26a by the first intermediate link side short protrusion 66 having an arcuate cross section and contacts the workpiece. 30, similarly to the first embodiment, when the swivel base 30 is pressed against the work piece, the swivel base 30 can easily turn along the shape of the work piece. It becomes easy to make the universal cap 30 contact the workpiece with a large contact area. For this reason, a large fixing force to the workpiece can be stably obtained regardless of the shape of the workpiece. Further, since the engaging portion between the first intermediate link 26a and the swivel base 30 includes the first intermediate link side short protrusion 66 having a circular arc cross section, each swivel base 30 can be turned regardless of the turn of each swivel base 30. The contact area between the base 30 and the engaged first intermediate link 26a can be increased, and sufficient durability can be ensured even when the fixing force to the workpiece is increased. Also, there is no need to use a specially shaped spring. Since other configurations and operations are the same as those in the first embodiment, the same parts are denoted by the same reference numerals and redundant description is omitted.

  Although not shown in the drawings, unlike the above embodiments, the link units 22 and 22a are arranged on the movable member 20 side and linked to the workpiece 16 or the cut material 10 arranged on the fixed member 18 side. It is also possible to press each swivel cap 30 of the units 22 and 22a. In addition, members corresponding to the link units 22 and 22a can be connected to a fixed member or a movable member. In other words, the first intermediate links 26 and 26a are pivotably engaged with the fixed member or the movable member by the projecting portions having an arcuate cross section, and a part of the fixed member or the movable member has the function of the pivot bases 24 and 24a. It can also be made. In addition, the movable member is not limited to a configuration that can move in the horizontal direction with respect to the fixed member. The movable member can be moved in the vertical direction with respect to the fixed member, and the workpiece can be held in the vertical direction. It can also be.

  Further, in the first embodiment shown in FIG. 1 to FIG. 8 described above, in addition to the first intermediate link 26 and the second intermediate link 28, another one or more stages of the turning base 24 are provided. It is also possible to connect the intermediate links so as to be able to turn in order, and to allow the turnable base 30 to turnably engage with the intermediate link at the final stage. In this case, the fixing force to the workpiece can be further increased even when the side surface of the workpiece has an uneven surface that changes more finely than in the case of each of the above embodiments.

It is a principal part perspective view which shows the state which hold | maintained the workpiece by the workpiece holding apparatus of the 1st Embodiment of this invention. It is the figure which took out the link unit from FIG. 1 and was seen from upper direction. It is the figure seen from the left side of FIG. 2 to the right side. It is a figure which takes out and shows a turning base from FIG. It is a figure which takes out and shows the 1st intermediate link from FIG. FIG. 3 is a diagram showing one second intermediate link extracted from FIG. 2. It is a figure which takes out and shows one swivel base from FIG. It is the figure which looked at the state which held the cut-out material with the workpiece holding device from the upper part. It is a figure corresponding to FIG. 2 which shows the workpiece holding apparatus of the 2nd Embodiment of this invention. It is the schematic which shows the state which hold | maintained the cutting raw material with the workpiece holding apparatus known conventionally.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 Cut-out material, 12 Fixed side base, 14 Movable side base, 16 Workpiece, 18 Fixed member, 20 Movable member, 22, 22a Link unit, 24, 24a Turning base, 26, 26a 1st intermediate link, 28 2nd Intermediate link, 30 swivel base, 32 pin insertion hole, 34 partial circular groove, 36 swivel base side protrusion, 38 contact surface, 40 semicircular part, 42 column part, 44 first intermediate link side long hole part, 46 1st intermediate link side short hole part, 48 2nd intermediate link side long protrusion part, 50 2nd intermediate link side short protrusion part, 52 end plate part, 54 contact surface, 56 connecting plate part, 58 protrusion part, 60 base Side hole part, 62 Turning base side hole part, 64 First intermediate link side long protrusion part, 66 First intermediate link side short protrusion part.

Claims (8)

A workpiece holding device capable of sandwiching a workpiece between a fixed member and a movable member,
A first intermediate link that is pivotably engaged by one of a fixed member and a movable member or another member that contacts the one member by a protrusion having an arcuate cross section;
A swivel base that is pivotably engaged with a first intermediate link or a second other member connected to the first intermediate link by a protrusion having an arcuate cross section and that contacts the workpiece. Workpiece holding device characterized by the above. The workpiece holding device according to claim 1,
A workpiece holding device, wherein a pivot center between the first intermediate link and the pivotable base is located on a virtual plane on which a contact surface of the pivotable base with respect to the workpiece is located. In the workpiece holding device according to claim 1 or 2,
A plurality of swivel bases are pivotally engaged with a first intermediate link or a second other member connected to the first intermediate link by a protrusion having an arcuate cross section. Object holding device. In the workpiece holding device according to any one of claims 1 to 3,
The second intermediate member connected to the first intermediate link or the first intermediate link and the swivel base are positioned at two positions on both ends in a direction perpendicular to the pressing direction of the swivel base against the workpiece. It is engaged by the provided arcuate engagement part,
Each arcuate engagement portion is provided on the other side of the first intermediate link or the second other member connected to the first intermediate link, a hole having an arcuate cross section provided on one of the swivel base, and the other A workpiece holding device, wherein the workpiece holding device is configured by engaging a projection having an arcuate cross section. The workpiece holding device according to claim 1,
A second intermediate link connected to the first intermediate link so as to be pivotably engaged by a projection having an arcuate cross section;
A workpiece holding device, wherein the swivel base is pivotably engaged with the second intermediate link by a projection having an arcuate cross section. The workpiece holding device according to claim 5,
A workpiece holding device characterized in that a pivot center of the first intermediate link, the second intermediate link, and the pivotable base is located on a virtual plane on which a contact surface of the pivotable base with the workpiece is located. . In the workpiece holding device according to claim 5 or 6,
A plurality of second intermediate links are pivotably engaged with the first intermediate link,
A workpiece holding device, wherein a plurality of swivel caps are pivotably engaged with each second intermediate link. A workpiece holding device capable of sandwiching a workpiece between a fixed member and a movable member,
A removable link unit is provided between the fixed member and the movable member.
When the link unit defines a first direction, a second direction, and a third direction orthogonal to each other,
A swivel base that is another member having a contact surface that contacts one of the fixed member and the movable member, and a swivel base side protrusion having an arc-shaped cross section provided at both ends in the first direction;
A first intermediate link side oblong portion having an arcuate cross section that is provided at both ends in the first direction of the one end portion in the second direction and engages with the protrusion on the turning base side, and a plurality of first portions at the other end portion in the second direction. First intermediate link side short hole portions having arc-shaped cross sections provided at both ends in the direction, and being pivotably engaged with the turning base by the turning base side protrusion,
A plurality of second intermediate link side long protrusions having an arcuate cross-section that are provided at both ends in the first direction of the second direction one end and engage with the first intermediate link side short hole, and a plurality of other ends in the second direction Second intermediate link side short protrusions having a circular arc cross section provided at both ends in the first direction of the first direction so as to be pivotably engaged with the first intermediate links by the second intermediate link side long protrusions. A plurality of second intermediate links, which are second other members connected to
Provided at both ends in the first direction and having a base-side hole with an arc-shaped cross section that engages with the second intermediate link-side short protrusion, and swivels by the second intermediate link-side short protrusion with respect to the second intermediate link A plurality of swivel bases that freely engage and contact the workpiece,
A turning center of the first intermediate link, each second intermediate link, and each swivel base is located on a virtual plane on which the contact surface of the swivel base with respect to the workpiece is located. Object holding device.

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