Workpiece holding device

A technology for holding devices and workpieces, applied in the direction of work accessories, manufacturing tools, stone processing tools, etc., can solve the problems of enlarged diameter, deterioration of perforation accuracy, and increase of slack.

Inactive Publication Date: 2004-05-05
UHT CORP
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AI-Extracted Technical Summary

Problems solved by technology

[0009] However, although the joint method (No. A) applies tension without causing wrinkles and slack on the workpiece, and engages the positioning hole with the positioning pin, the workpiece part between the joint parts is not fixed, so it is easy to cause tension on the part of the workpiece between the joint parts. The slack over time increases the amount of slack in proportion to the size of the workpiece to be pierced, and there is a problem that the piercing accuracy deteriorates.
[0010] In the case wh...
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Method used

[0148] In addition, in claims 4 and 5, it is supplied to the workpiece holder to engage the positioning pin with the positioning hole, or to actuate the driving device for pin movement and the dr...
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Abstract

To hold a workpiece by a work holder without permitting wrinkles or loosening.In the work holer 1, positioning pins 11 are provided at corresponding positions to four corners of the workpiece W to be movable in diagonal directions of the workpiece W, and on the work holder 1, a pin moving drive 2 to move the positioning pin 11 for prescribed quantity outward in the diagonal direction of the workpiece W for providing prescribed tension to it is provided. Otherwise, a clamp body to releasably hold the workpiece is provided at a desired position of the work holder, and a clamp moving drive to move the clamp body for prescribed quantity for providing prescribed tension to the workpiece is provided.C)2004,JPO.

Application Domain

Working accessoriesStone-like material working tools

Technology Topic

EngineeringMechanical engineering +1

Image

  • Workpiece holding device
  • Workpiece holding device
  • Workpiece holding device

Examples

  • Experimental program(1)

Example Embodiment

[0080] Embodiments of the workpiece holding device according to the invention will be described below. Figure 1~ Figure 5 The first embodiment is shown, and Fig. 6 to Fig. 11 show the second embodiment, Figure 12 ~ Fig. 15 shows the third embodiment, Fig. 16 shows the fourth embodiment, Fig. 17 ~ Fig. 21 shows the fifth embodiment, Figure 22 ~ Fig. 25 shows the sixth embodiment, Fig. 26 and Fig. 27 show the seventh embodiment, Fig. 28 and Fig. 29 show the eighth embodiment, Figure 30 ~ Figure 34 Showing the ninth embodiment, Figure 35 and Figure 36 A tenth embodiment is shown.
[0081] First, the first embodiment will be described. Symbol 1 is a workpiece support, and symbol B is a tension applying mechanism provided on the workpiece support 1 .
[0082] This tension applying mechanism B includes positioning pins 11 provided at positions corresponding to the four corners of the workpiece W so as to be movable in the diagonal direction of the workpiece W in the workpiece holder 1, and a pin moving drive device for moving the positioning pins 11. 2.
[0083] The workpiece support 1 is made of stainless steel, and as known in the past, it is generally in the shape of a rectangular frame in plan view, and has positioning pins 11 in the shape of protrusions at the four corners. Area-enlarging portions 31 , 31 are integrally provided at both ends of each constituent frame portion 21 in a direction perpendicular to the constituent frame portion 21 .
[0084] The above-mentioned positioning pin 11 is guided by a guide hole 41 of appropriate length provided in the workpiece support 1 toward the diagonal direction of the workpiece W and can move toward the diagonal direction of the workpiece W. The workpiece W moves outside in the diagonal direction by a predetermined amount.
[0085] Pin moves with driving device 2 as shown in Figure 2, image 3 As shown, it includes: propulsion mechanisms 12, 12 respectively movable back and forth in the two parallel constituent frame portions 21, 21 on the side of the above-mentioned area-enlarging portion 31 of the workpiece holder 1, The drive source 22 for moving the pusher mechanisms 12, 12 back and forth, the mover 32 for moving the positioning pin 11 outward in the diagonal direction of the workpiece W as the pusher mechanisms 12, 12 move, and its guide 42.
[0086] The propulsion mechanisms 12, 12 are fitted into the elongated rectangular moving spaces 121, 121 ensured in the front-rear direction in the above-mentioned constituent frame portions 21, 21 so as to be movable back and forth, and the connecting protrusions are formed from the ends on the driving source 22 side. 12c protrudes toward the upper side of the frame part 21, and the piston rod of the air cylinder which is the driving source 22 is connected to the connecting convex part 12c.
[0087] In FIG. 1 , reference numeral 122 is an opening constituting a wall portion on the upper side of the moving space 121 provided on the driving source 22 side in the moving space 121 , and allows the forward and backward movement of the connecting convex portion 12c.
[0088] In addition, the propulsion mechanisms 12, 12 form a narrow tapered surface 12a on the front end side opposite to the central space 51, and form a curved concave surface 12b on the opposite side of the middle portion.
[0089] The mover 32 is a cylindrical body that is movably disposed in a guide portion (guide space) 42 that is communicated with the above-mentioned moving space 121 and secured in the frame portion 21 toward the outside in the diagonal direction of the workpiece W. The above-mentioned positioning pin 11 protrudes from the central part of the upper surface of the upper surface, and can move in the guide part 42 toward the outside in the diagonal direction of the workpiece W against the elastic force of the elastic spring 52 disposed therebetween.
[0090] In addition, the movable member 32 contacts the tapered surface 12a and the curved concave surface 12b respectively as shown in FIG. When moving forward, each moving member 32, 32 resists the elastic force of the elastic clockwork spring 52 and is guided by the guide part (guide space) 42 to reach the side of the propulsion mechanism 12, so that the positioning pin 11 is directed toward the outside of the workpiece W in the diagonal direction. Mobile Scheduled Amount ( image 3 ).
[0091] With such a workpiece holding device, before the drive source 22 is actuated, the movable member 32 is in contact with the tapered surface 12a and the curved concave surface 12b, and the positioning pin 11 and the positioning hole opened in the corner of the workpiece W at the stage before applying a predetermined tension are in contact with each other. w1 basically becomes a correspondence relation.
[0092] For this purpose, after supplying the workpiece W suspended by a loader (supply device) having a suspension support member such as a vacuum pad so that the positioning hole w1 is engaged with the positioning pin 11, the drive source 22 is actuated to move the propulsion mechanism 12 forward. A predetermined tension is applied to the workpiece W by moving each movable member 32 by a predetermined amount outward in the diagonal direction of the workpiece W.
[0093] Next, a second embodiment shown in FIGS. 6 to 11 will be described. In this embodiment, the tension applying mechanism B is constituted by a clip body 43 capable of releasing the edge portion of the workpiece W, and a clip moving drive device 3 for moving the clip body 43 by a predetermined amount, and further includes a clip clamping drive device 4 .
[0094] The workpiece holder 1 is similar to the above-mentioned embodiment, and the both ends of a single frame part 21 clamped by the front end of the moving mechanism A are integrally provided with enlarged area portions 31 , 31 .
[0095] Clip moving drive device 3 such as Figure 7 As shown in ~ FIG. 11 , the pushing body 13 comprising two parallel frame portions 21 and 21 that can move back and forth respectively on the above-mentioned area enlarging portions 31 and 31 sides of the workpiece support 1, is arranged on the area enlarging portion 31, The driving source 23 for moving the pusher 13 back and forth, the pushed body 33 pushed outward by the pusher 13, and the clip body 43 can be moved.
[0096] As shown in FIGS. 10 and 11, the pusher 13 is in the shape of an elongated triangular plate with the outer side as a slope, and the pushed body 33 has a slope on the inner side that is in surface contact with the slope of the pusher 13. Both the pushing body 13 and the pushed body 33 are elongated triangular plate shapes and are accommodated in the hollow portion 211 constituting the frame portion 21 .
[0097] Protrusion 131 for connection protrudes from the end of pusher 13 on the side of drive source 23 to the outside, connects the connecting rod of the air cylinder as drive source 23 to this protrusion 131 for connection, and actuates drive source 23, thereby The pushing body 13 is moved forward, whereby the pushed body 33 is pushed outward by a predetermined amount against the elastic force of the elastic spring 33a interposed with the outer inner wall 211a of the hollow portion 211 .
[0098] Reference numeral 53 denotes a guide port, which guides the above-mentioned connecting convex portion 131 when the pushing body 13 is pushed.
[0099] Clip clamping drive device 4 such as Figure 7 ~ Figure 9 As shown, from the upper middle part of the pushed body 33, a higher horizontal step portion 331 is provided along the entire length or substantially the entire length of the pushed body 33 to form the same plane as the upper surface of the frame portion 21. Between the part 331 and the wall part 221a on the upper side of the hollow part 211, there is a gap 332 for the movement of the pushed body 33 that is pushed outward as the pushing body 13 is pushed. In the plan view of the horizontal step portion 331, the clip body 43a on the strip-shaped upper side is connected to the electric motor 14 provided on the horizontal step portion 331, and the magnetic sheet 43b is pasted on the clip body 43a on the upper side, and the The horizontal step portion 331 corresponding to the clamp body 43a on the upper side is used as the clamp body on the lower side, and its upper surface is used as a workpiece loading surface, and the magnetic sheet 43c is also pasted on this surface in the same way, and the action of the electric motor 14 can be used on the upper side. The magnetic piece 43b of the clip body 43a and the magnetic piece 43c of the workpiece mounting surface attract the parallel edge portion of the workpiece W.
[0100] In such a workpiece holding device, before the drive source 23 of the clip moving drive device 3 is actuated, the pusher 13 is in a backward state, and the pushed body 33 receives the elastic force of the elastic spring 33a and pushes the left and right pair of clips toward each other. Body 43,43.
[0101] For this reason, the parallel both edge portions of the workpiece W suspended by a loader (supply device) having a suspension support member such as a vacuum pad are placed on the above-mentioned workpiece mounting surface and supplied ( Figure 7 ), the driving device 4 for clip clamping is actuated, the parallel two edge portions of the workpiece W are adsorbed by the clip body 43, the driving device 3 for moving the clip is actuated, the pusher 13 is advanced, and the pushed body 13 is pushed outward in parallel. The pushing body 33 can apply a predetermined tension to the workpiece W ( Figure 8 , Figure 9 , Figure 11).
[0102] Below, explain Figure 12 ~ Figure 15 shows the third embodiment. The tension applying mechanism B of this embodiment is provided with clip bodies (referred to as first clip bodies in the following description) 43 at or near the two corners on the half side of the workpiece W that are releasably clamped by the workpiece holder 1 . The other half side of the workpiece W releasably clamps the edge of the workpiece W on the opposite side (hereinafter referred to as the second clamp body) 43 in order to apply tension to the workpiece W together with the clamp body 43 . The first clip body 43 is composed of the clamping driving device 4 for clamping the workpiece W and the clip moving driving device 3 for moving the clamping driving device 4 outward in the diagonal direction of the workpiece W by a predetermined amount.
[0103] In the same manner as the above-mentioned embodiment, the workpiece holder 1 integrally extends the two ends of the frame part clamped by the chuck at the front end of the moving mechanism A to form area enlarged parts 31, 31, and the area enlarged parts 31, 31 are provided with releasable parts. The driver device 4 for gripping the clip and the driver device 3 for moving the clip grip the vicinity of two corners on the half side of the workpiece W.
[0104] The driving device 4 for clip clamping is connected to a driving source 54 such as an air cylinder to a support table 44 having an arm serving as the lower clip body 34 at the lower end, and the upper side of the workpiece W that is clamped together with the above-mentioned arm can be supported by the driving source 54 to move up and down. The clip body 64 and the clip moving drive device 3 can move the above-mentioned support table 44 by a predetermined amount ( Figure 13 ~ Figure 15). The first clip body 43 is constituted by the above-mentioned lower clip body 34 and the upper clip body 64 .
[0105] One side of the second clip body 43 such as Figure 13 As shown in FIG. 15 , a plate-shaped upper clip body 74 in plan view is provided on the upper side of the frame portion of the other half of the workpiece W by a hinge so that it can rotate up and down, and a magnetic piece is pasted on the upper clip body 74 . 74a, at the same time, the frame portion corresponding to the upper clip body 74 is used as the lower clip body 84, and the magnetic sheet 84a is also pasted on the workpiece loading surface on the upper clip body 84 as the lower side, by the two magnetic sheets 74a, 84a releasably clamps the edge of the workpiece W opposite to the first clamp body 43 described above.
[0106] In such a workpiece holding device, one of the parallel edge portions of the workpiece W is clamped by the second clamp body 43, and the drive device 4 for clamp clamping is actuated, and the other workpiece is clamped by the first clamp bodies 43, 43. A predetermined tension can be applied by actuating the clip moving drive device 3 in the state of the edge corner or its vicinity.
[0107] Next, a fourth embodiment shown in Fig. 16 will be described. The tension applying mechanism B of this embodiment includes clamp bodies 94 that releasably clamp the four corners of the workpiece W, and guide recesses 61 formed in the workpiece holder 1 for guiding the clamp bodies 94 toward the diagonally outward direction of the workpiece W. The elastic spring 95 located between the guide recess 61 and the rear portion of the clip body 94, and the clip moving driving device 3 for moving the clip body 94 outward by a predetermined amount.
[0108] The clip body 94 uses the clip body 94b on its lower side as a workpiece loading surface, and the upper clip body 94a can be pivotally mounted on the workpiece loading surface so that the elastic spring 95 is positioned on the lower clip body. Between 94b and the wall of the guide recess 61, the clip body 94a can be moved outward in the diagonal direction of the workpiece W. As shown in FIG.
[0109] As shown in FIG. 16, the driving device 3 for moving the clip includes a push rod 63 which is in contact with the front end faces of the clip bodies 94b, 94b on the lower side of the two pairs of clip bodies 94, 94 on the short side of the workpiece holder 1, and the push rod 63 to make the push rod The drive source 73 such as the air cylinder that 63 retreats is connected.
[0110] The 4 corners of the workpiece sent to the workpiece support 1 are clamped by the clip body 94, and the driving sources 73, 73 are respectively actuated, and the four clip bodies 94 are respectively directed towards the opposite sides of the workpiece W by the push rods 63, 63. It moves outward in the direction of the corner line, and applies a predetermined tension to the workpiece W.
[0111] Of course, in this embodiment, it is also possible to provide the above-mentioned driving device 4 for gripping the clip, from the range where the workpiece mounting surface of the lower clip body 94b is exposed to the range where the workpiece W is clamped together with the workpiece mounting surface. Each upper clip body 94a is configured to turn.
[0112] In this way, as in the above-mentioned first and second embodiments, a predetermined tension can be applied to the workpiece and held on the workpiece holder without manual work.
[0113] The clip body of the fourth embodiment described above may be configured to be in contact with each other by the elastic force of the springs provided on the slewing support portions, and may be configured to clamp the workpiece by the elastic force of the springs. Of course, when the workpiece is clamped, the clamp body on the upper side is turned upward against the spring force thereof.
[0114] Next, a fifth embodiment will be described. This embodiment has a workpiece holder 1, an adsorption mechanism 5 disposed in the central space 51 of the workpiece holder 1 and having a workpiece flat surface 15 having the same shape as the upper surface of the workpiece holder 1, and releasably fixing the workpiece W together with the workpiece holder 1. The fixing mechanism6.
[0115] The workpiece holder 1 has a rectangular frame shape in plan view as well known in the past, and has positioning pins 11 . . . at four corners projectingly.
[0116] As shown in Figure 18 and Figure 21, the fixing mechanism 6 is a frame-shaped body having the same size as the workpiece support 1, and the position corresponding to the positioning pin 11 ... is provided with the engaging hole 16 ... that the positioning pin 11 ... engages, and overlaps to The top of the workpiece support 1 is mounted on the workpiece support 1 with a shaft that can turn up and down through a hinge.
[0117] The magnetic sheet 6a is pasted on the lower surface of the fixing mechanism 6, so that the fixing mechanism 6 constitutes a magnetic frame (denoted with symbols in the following description) 6'.
[0118] The magnetic frame body 6' is a frame-shaped clip body.
[0119] The magnetic piece 6a is continuously pasted in a ring shape on the lower surface of each constituent frame portion constituting the magnetic frame body 6', except for the engaging hole 16... portion.
[0120] On the other hand, in order to attract the magnetic piece 6a when the above-mentioned fixing mechanism 6 is overlapped and rotated downward, the workpiece holder 1 continuously sticks the magnetic piece 1a in a ring shape on the upper surface of each frame portion 21 except the positioning pin 11, Constitutes a magnetic workpiece holder.
[0121] The suction mechanism 5 is a workbench. As shown in FIG. 21 , a recessed step portion 25 on which the workpiece holder 1 is placed is recessed at a portion corresponding to the above-mentioned workpiece holder 1. By placing the workpiece holder 1 on the concave step portion 25, The upper surface of the central part surrounding the concave step portion 25 is arranged in the central space 51 of the workpiece holder 1 to form a workpiece flat surface 15 that is the same as the upper surface of the workpiece holder 1, and the workpiece flat surface 15 is opened in a dispersed manner to communicate with the air. Vacuum holes 35... of the suction device (not shown).
[0122]In the workpiece holding device thus constituted, as shown in FIGS. 18 and 19, the workpiece W is placed on the workpiece flat surface 15, and the workpiece W is sucked from the vacuum holes 35... while smoothing out wrinkles and waves of the workpiece W by hand. In the fixed state obtained by this vacuum, after the positioning hole w1 opened in the workpiece W is engaged with the positioning pin 11, the magnetic frame 6' is rotated, and the magnetic frame 6' and the magnetic pieces 6a, 1a of the workpiece holder 1 are connected to each other. The suction force firmly grips the entire edge of the workpiece W.
[0123] In this way, the workpiece W is kept in a state free from wrinkles and waves. Then, stop the action of the air suction device (not shown in the figure), extract upwards from the adsorption mechanism 5, directly overlap into a multi-stage shape, and be removably accommodated in the stacking tray ( Figure 20 , Figure 21).
[0124] The total thickness of the workpiece holder 1 and the magnetic frame 6' is at most 2 to 3 mm.
[0125] Below, explain Figure 22 ~The sixth embodiment shown in FIG. 25. This embodiment shows an embodiment in which the workpiece W is fixed by the workpiece holder 1 without the positioning pin 11, the suction mechanism 5, and the magnetic frame (fixing mechanism) 6'. The workpiece holder 1 does not have the positioning pin 11, and the magnetic frame body 6' does not have the engaging hole 16 for engaging the positioning pin 11, but the configuration is the same as that of the above-mentioned embodiment.
[0126] Then, the workpiece W is sucked from the vacuum hole 35... while smoothing the wrinkles and waves of the workpiece W by hand on the workpiece flat surface 15 of the suction mechanism 5, and the magnetic frame 6' is rotated in a fixed state obtained by the vacuum. , the entire edge of the workpiece W is clamped by the magnetic frame 6' and the magnetic pieces 6a, 1a of the workpiece holder 1 by the adsorption force ( Figure 22 , Figure 23).
[0127] After clamping, the same as above, stop the action of the air suction device (not shown in the figure), and remove it from the adsorption mechanism 5. This point is also the same as the above-mentioned fifth embodiment ( Figure 24 , Figure 25).
[0128] Next, a seventh embodiment shown in Figs. 26 and 27 will be described. This embodiment is an embodiment in which the adsorption mechanism 5 of the above-mentioned fifth embodiment is formed as a simple table without a vacuum mechanism.
[0129] In this case, the convex surface of the table is used as the workpiece flat surface 15, and the positioning hole w1 opened in the workpiece W is joined to the positioning pin 11 while smoothing the wrinkles and waves of the workpiece W by hand, and then the magnetic frame 6 is ' rotates, and the entire edge of the workpiece W is firmly clamped by the magnetic frame body 6' and the magnetic pieces 6a, 1a of the workpiece support 1 by the adsorption force.
[0130] Next, an eighth embodiment shown in Figs. 28 and 29 will be described. Except for the fact that the workpiece holder 1 has no positioning pin 11, it is the same as the above-mentioned seventh embodiment, so the specific description will be omitted, but while using the workpiece flat surface 15 to artificially smooth the wrinkles and waves of the workpiece W, the The magnetic frame body 6' rotates, and the entire edge of the workpiece W is clamped by the magnetic frame body 6' and the magnetic pieces 6a, 1a of the workpiece holder 1 by the adsorption force.
[0131] Below, explain Figure 30 ~ Figure 34 Shown the 9th embodiment. Symbol 1 is a workpiece support, which is formed in a hollow shape inside.
[0132] A moving body 7 is provided on a pair of parallel frame portions 21, 21 so that the workpiece holder 1 can move toward and away from each other, and a pair of parallel edge portions for releasably clamping the workpiece W are provided on the moving body 7. The clip body 104, which is strip-shaped in plan view, is elastically applied to the clip body 104 by the elastic mechanism 8 between the moving body 7 and the moving body 7 in the frame portions 21 and 21.
[0133] Mobile body 7 such as Figure 34 As shown, from the main body 17 that is movably accommodated in the above-mentioned frame portion 21 in the direction of approaching and separating from each other, the convex portion 27 for connection protrudes onto the frame portion 21, and the above-mentioned In plan view, it is a plate-shaped clip body 104 .
[0134] In addition, the clip body 104 has a configuration in which the upper clip body 104b is mounted to the lower clip body 104a slidably contacting the upper surface of the workpiece holder 1 with a shaft so as to be rotatable up and down. The magnetic pieces 104c, 104d are pasted on top, and a pair of parallel edge portions of the workpiece W are clamped by the suction force of the upper and lower pair of clip bodies 104a, 104b.
[0135] Reference numeral 21a is a guide hole for the above-mentioned convex portion, which is opened on the upper surface of the above-mentioned constituting frame portion 21 of the workpiece holder 1 . In addition, reference numeral 101 is a pusher that pushes the moving body 7 toward each other against the elastic force of the above-mentioned elastic mechanism 8 , and is detachably provided on the constituent frame portion 21 . The pusher 101 is formed to protrude from the table-shaped support portion 100 as shown in the drawing.
[0136] In this embodiment, the above-mentioned tension applying mechanism B is constituted by the above-mentioned frame portion 21 , the clip body 104 , the elastic mechanism 8 , and the pusher 101 .
[0137] Therefore, in the state where the pusher 101 is inserted and the moving body 7 is moved in the direction of approaching each other against the elastic force of the elastic mechanism 8, the upper clip body 104b is turned downward, and the upper and lower clip bodies 104a, 104b are attracted by each other. The two parallel edges of the workpiece W are firmly clamped. In this state, the workpiece holder 1 itself is drawn upward by pulling out the pusher 101, and the moving body 7 and the upper and lower pair of clip bodies 104a, 104b receive the elasticity of the elastic mechanism 8. The force is pushed toward the leaving direction, thereby holding the workpiece W to the workpiece holder 1 in a state where wrinkles and waves are automatically eliminated.
[0138] Since the thickness of the workpiece support is 2-3 mm, the total thickness of the hollow workpiece support 1 and the clip body 104 is at most 4-5 mm.
[0139] Below, explain Figure 35 and Figure 36 The 10th embodiment shown. This embodiment is an example in which one or both clip bodies 104 shown in the above-mentioned ninth embodiment can be artificially pushed toward the approaching direction against the elastic force of the elastic mechanism (elastic force applying mechanism) 8 .
[0140] In this embodiment, one clip body 104 is attached to the frame portion 21 with a shaft so as to be rotatable up and down, and the magnetic pieces 104c and 104d are stuck on both sides of the frame portion 21 in contact with the clip body 104, and are releasably adsorbed. One of the pair of parallel edge portions of the workpiece W artificially pushes the other clip body 104 against the elastic force of the elastic mechanism (elastic force applying mechanism) 8 in the same manner as in the above-mentioned ninth embodiment, thereby moving toward the above-mentioned one clip body. The body 104 approaches.
[0141] The above-mentioned other clip body 104 is the same as the above-mentioned 9th embodiment, and is constituted by a pair of clip bodies 104a, 104b up and down. The upper clamp body 104b rotates downward, and the edge portion of the parallel other side of the workpiece W is clamped by the adsorption force of the magnetic pieces 104c and 104d, and the artificial force is eliminated, and the clamp body 104 on the one side is automatically moved in a direction away from the above-mentioned one. , can eliminate wrinkles and waves generated in the workpiece W.
[0142] The above-mentioned clip body 104 is formed in a structure in which the springs provided in the slewing support parts are pressed against each other by the elastic force of the springs, and even if it adopts a structure in which the workpiece is clamped by the elastic force of the springs, it is an arbitrary structure. Of course, when the workpiece is clamped, the upper clamp body is turned upward against its elastic force.
[0143] In this embodiment, an example is described in which the magnetic force is transmitted through the workpiece as the perforation target as can be seen from the drawings. The pieces are adsorbed to each other, and the workpiece is clamped by their adsorption force.
[0144] Since the present invention is constituted as described above, the workpiece can be held by the workpiece holder without causing wrinkles, slack, or the like.
[0145] Furthermore, the workpiece does not easily loosen over time, which is suitable for improving the accuracy of piercing (claim 2, etc.).
[0146] In addition, when using the suction mechanism, the workpiece can be sucked by the suction mechanism while smoothing the wrinkles and waves of the workpiece by hand. In this state, the workpiece can be fixed to the workpiece holder by the fixing mechanism, so it can prevent unintentional action on the workpiece. The strong pulling force causes plastic deformation or damage to the workpiece (claim 3), and the workpiece cannot Therefore, the inertial force at the time of punching is not locally concentrated in the positioning hole (joint portion), and there is no danger of poor punching accuracy due to the inertial force (claims 10 and 11).
[0147] Furthermore, when the magnetic frames are installed on the workpiece holder, there is no need to manage them one by one separately from the workpiece holder, and no inventory space is occupied (claim 12).
[0148] In addition, in claims 4 and 5, the positioning pins are supplied to the workpiece holder to engage with the positioning holes, or the workpiece is gripped by the clamp body, and the driving device for moving the pin and the driving device for clamp moving are actuated to apply pressure to the workpiece. Predetermined tension is maintained on the workpiece holder to improve workability.
[0149] In addition, in claim 4, after the workpiece is supplied by the loader (supply device) by engaging the positioning hole with the positioning pin, the driving device for moving the pin is activated to move the positioning pin by a predetermined amount and apply tension to move the workpiece It is held on the workpiece support without manual labor at all. When tension is applied to the positioning pin of the workpiece support to engage the positioning hole of the workpiece, a strong pulling force will not be applied to the workpiece inadvertently to cause plastic deformation or damage to the workpiece. In claim 6 In the same way, even if the clip body is not opened artificially, the clip body is opened by actuating the clip clamping drive device, and after clamping the workpiece supplied by the loader (supply device), the clip moving drive device is actuated , can apply a predetermined tension to keep the workpiece on the workpiece holder without manual work at all.
[0150] In addition, in a plan view, the plate-shaped clip body is superimposed on a pair of parallel frame parts of the workpiece holder, and in a plan view, the frame-shaped workpiece holder is superimposed on a frame-shaped clip body or a magnetic frame. Also, the overall height is suppressed to 10 mm or less as shown in the embodiment, and the workpiece can be held without breaking the balance even if it is stacked in multiple stages.
[0151] Therefore, stacking in multiple stages is stable even in the state where the workpiece is held, and it is also possible to stack in multiple stages so as to be plugged in and out on the stacking tray.

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