专利摘要:
11 ABSTRACT The invention concerns a gripper (1) adapted to be used in an automated sys-tem for handling flexible substrates provided in a pile. The gripper (1) is rotat-5 ably arranged on an arm (6) of a robot and comprises a lower finger (7) and an upper finger (8). The lower finger (7) comprises a sharp, wedge-shapededge (14), which is adapted to enable insertion of said lower finger (7) be-tween substrates of said pile. Said lower finger (7) has a round tip (11), whichextends to at least one side of the lower finger (7) and forms a smooth, 10 wedge-shaped edge (15), wherein said sharp, wedge-shaped edge (14) isarranged on said at least one side remote from said tip (11) and substantiallyin level with but protruding further than said smooth, wedge-shaped edge(15). 15 Elected for publication: fig. 2
公开号:SE1450358A1
申请号:SE1450358
申请日:2014-03-28
公开日:2015-09-29
发明作者:Bo Genefke
申请人:Yaskawa Nordic Ab;
IPC主号:
专利说明:

AWAPATENT AB Kontor/HandläggareVäxjö/Svante Franzen/SF Yaskawa Nordic ABVår referens SE-21065955 Ansökningsnr 1 GRIPPER Technical Field The present invention relates to a gripper adapted to be used in an au-tomated system for handling flexible substrates provided in a pile, said gripperbeing rotatably arranged on an arm of a robot and comprising a lower fingerand an upper finger, wherein said lower finger comprises a sharp, wedge-shaped edge, which is adapted to enable insertion of said lower finger be-tween substrates of said pile. ln this context, flexible substrates is meant to comprise all sorts offlex-ible substrates which can be provided in piles, that is for instance papersheets, whether printed or not, plastic substrates, sheets of metal foil, or evensheets of pastry or pasta. Further, by handling in this context is meant grip-ping and lifting of at least one flexible substrate at a time off of a pile, for in-stance in order to relocate it, to turn it or to aerate it.
Prior Art A gripper according to the preamble is known from WO 2012/069056A1, in which a device is disclosed for automatic handling and aeration of apile of substrates in the form of paper sheets. The gripper of the device inquestion is one of a pair of grippers being rotatably arranged on one armeach of a two-arm robot. ln order to enable insertion of a lower finger between paper substratesof a pile said lower finger comprises a tip portion having a straight front edgewith a chisel shaped grind, the bevel of which being placed on the bottomside of the finger.
Obiect of the lnvention The shape of the lower finger of the prior art gripper is prone to causewrinkling of substrates or scratching of these, especially when a lower finger, inserted between flexible substrates of a pile, is moved sideways along thepile.
Against that background an object of the present invention is to miti-gate the wrinkling or scratching problem by providing an improved gripper.
Brief Summarv of the lnvention According to the invention the above object is achieved by means of agripper according to the preamble, said gripper being characterized in thatsaid lower finger has a round tip, which extends to at least one side of thelower finger and forms a smooth, wedge-shaped edge, and in that said sharp,wedge-shaped edge is arranged on said at least one side remote from saidtip and substantially in level with but protruding further than said smooth,wedge-shaped edge. By this arrangement it is rendered possible for the ro-bot, when holding the gripper in a first rotational position, to first let the sharpedge enter between substrates of the pile and then let the smooth edge followinto a gap created by the sharp edge. And further, when the robot thereafteris turning the gripper into a second rotational position, to move the sharpedge out of the pile and to just let the smooth edge remain therein, saidsmooth edge being less prone to cause damage to the flexible substratesthan a sharp edge is when for instance moving an inserted gripper along saidpile.
Preferably, said wedge-shaped edges rise from a substantially flat bot-tom face of said lower finger towards a flat top plateau of that finger. This is ofgreat benefit for one thing because the sharp edge, while it is being insertedin a pile, in that way smoothly lifts substrates above without affecting sub-strates below, and for another because the slant of the smooth edge to someextent makes the shape of the lower finger fit a natural shape adopted by flex-ible substrates when an inserted lower finger is moved sideways along a pile.
Movement of an inserted lower finger along a pile is further optimized,if said bottom side and said top plateau are exactly or at least substantiallyparallel.
Movement of an inserted lower finger along a pile is still further opti-mized, if a tip part of said bottom face is tapering towards said top plateau.
Preferably, a plurality of first gas nozzles is arranged in an interfacearea between said sharp, wedge-shaped edge and said top plateau, said firstgas nozzles being directed to blow gas essentially in parallel with and awayfrom the top plateau. This is advantageous since it cushions movement of thesharp edge while being inserted into a pile.
Preferably, a plurality of second gas nozzles is arranged along saidsmooth, wedge-shaped edge, said second gas nozzles being directed to blowgas essentially away from said rounded tip in parallel with the top plateau.This is of great help when moving an inserted lower finger along a pile and forsafe release of previously gripped substrates from a gripper.
Preferably, the gas used is ionized air. lonized air causes less prob-lems with static electricity, which is of great advantage in the case at hand.
Preferably, said smooth, wedge-shaped edge extends around said tipto both sides of said lower finger. Such a solution is advantageous since itrenders it possible to displace an inserted lower finger equally well to bothsides along a pile and since it allows use of a pair of identical grippers, eachrotatably arranged on an arm of a two armed robot. Use of identical gripperssimplifies logistics and servicing, a prerequisite for that being that the grippersare equally well usable on both arms of the robot.
Test made by the applicant have shown that the best result, that is thesmoothest substrate handling, is achieved if said sharp, wedge-shaped edgeforms an edge angle within an interval of 5-30°, preferably of 10-25°, andmost preferably of 15-20°.
Preferably, said smooth, wedge-shaped edge is recessed in relation tothe sharp edge, but rises to the top plateau at the same angle as the sharpedge and coplanar with that edge. ln that way a smooth transition betweenthe two edges is achieved.
For increased durability said top plateau preferably comprises a metalinlay.
The upper finger preferably comprises a resilient pad, which is ar-ranged opposite to said lower finger rotatably about an axis normal to saidupper finger. This is advantageous since flexible substrates require careful handling and the lower finger has to be made quite rigid in order to fulfill itstask of insertion between and rotation in relation to said substrates.
Preferably, the resilient pad is provided with an air bleed duct. This isof help when releasing of previously gripped substrates from a gripper, sinceit prevents suction forces.
Preferably, the top plateau of the lower finger comprises a resilient in-lay opposite to the resilient pad of the upper finger. This is advantageoussince it reduces impact on the flexible substrates and helps providing enoughfriction to enable safe handling of substrates even at moderate gripping pres- sure levels.
Brief Description of the Drawinqs ln the drawings an embodiment of the present invention is illustratedschematically, wherein: Fig. 1 is a perspective view showing a two armed robot behind a pile offlexible substrates; Fig. 2 is a perspective view showing a gripper of the robot; and Fig. 3 is a top view showing the gripper of fig. 2.
Detailed Description of a Preferred Embodiment ln the following a preferred embodiment of the invention is described indetail with reference being had to the accompanying drawings.
The invention concerns a gripper 1, which is adapted to be used in anautomated system 2 for handling flexible substrates 3 provided in a pile 4.
As can be seen in fig. 1, according to the preferred embodiment of theinvention the system 2 comprises a two-arm robot 5, which is placed behindsaid pile 4. The robot 5 comprises two arms 6 being bendable or rotatableabout a plurality of axis, which is well known in the art and hence not furtherelucidated. The robot 5 further comprises a pair of grippers 1, which can beidentical, mirror-inverted or all different and are rotatably arranged on one arm6 each of the robot 5. ln the following the description is limited to just one ofthe grippers 1, which is one that bears the features of the present inventionand is illustrated in detail in the drawings in figs. 2 and 3.
The gripper 1 shown in fig. 2 comprises a lower finger 7 and an upperfinger 8, wherein lower and upper in this case refer to normal use of the grip-per 1 when dealing with a substantially flat pile 4, which is horizontally restingon a floor or another leveled base 9 (c.f. fig. 1).
The lower finger 7 comprises a flat bottom face 10, which for a tiltingaction described below is rising somewhat at 10' towards a fingertip 11, and aflat top plateau 12, which is parallel with the bottom face 10. The bottom face10 and the top plateau 12 both have a basically rectangular shape but con-verge into a semi-circular shape towards the fingertip 11. The bottom face 10and the top plateau 12 are interconnected by means of wedge structure (to bedescribed in detail below) on all sides except where they meet the arm 6 ofthe robot 5. Since the top plateau 12 is smaller than the bottom face 10, thewedge structure is slanting from the top plateau 12 towards the bottom face10 and meets the bottom face 10 along straight lines on sides of the lowerfinger 7 (mind said basically rectangular shape) and along a curved line alongthe fingertip 11 (mind said semi-circular shape).
The upper finger 8 is arranged opposite to the lower finger 7 and mov-able towards and away from the lower finger 7 by parallel displacement undercontrol of the robot 6. The upper finger 8 comprises an essentially domeshaped resilient pad 13, which is arranged exactly opposite to the top plateau12 of the lower finger 7 and for added flexibility and smooth substrate han-dling is rotatable about an axis normal to said upper finger 8.
The lower finger 7 is arranged to be inserted between substrates 3 ofthe pile 4 by wedging the substrates 3 apart. This is accomplished by meansof a first portion of said wedge structure, which comprises a sharp, wedge-shaped edge 14 arranged on one side of the lower finger remote from thefingertip 11. As can be seen, the sharp edge 14 rises from the bottom face 10of the lower finger 7 towards the top plateau 14 at an acute angle A, whichpreferably lies within an interval of 5-30°, preferably of 10-25°, and most pre-ferably of 15-20°.
As the sharp edge 14 is arranged on a side of the lower finger 7, in or-der to make it wedge substrates 3 apart the gripper 1 has to be turned by therobot 5, such that the lower finger 7 approaches the pile 4 sideways.
Once the initial wedging has taken place according to the above, asecond portion of the wedge structure comes into play. The second portion ofthe wedge structure comprises a smooth, wedge-shaped edge 15, which ex-tends along both said sides of the lower finger 7 and runs around the fingertip11. As can be seen, the smooth edge 15 is recessed in relation to the sharpedge 14, but rises to the top plateau 12 at the same angle A as the sharpedge 14 and coplanar with that edge 14. Thus, after the initial wedging beingperformed by the sharp edge 14, the smooth edge 15 can without difficultyenter between the substrates 3, too. Now it is possible to turn the gripper 1 ina way that leaves just the smooth edged portion 15 of said wedge structurebetween the wedged apart substrates 3, the fingertip 11 pointing straight for-ward into the pile 4.
When the lower finger 7 is inserted in the way just described, the resi-lient pad 13 of the upper finger 8 is arranged above a top substrate 3 of thepile 4, however not yet tightened. Hence, the lower finger 7 can be displacedsideways along the pile 4 helped by the wedging effect of the smooth edge 15on the sides and tip 11 of the lower finger 7. ln order to prevent the lower finger 7, while being displaced sideways,from scratching or in another way harming a substrate 3 resting thereon, pre-ferably the gripper 1 is tilted, such that only an edge of said substrate 3 con-tacts the top plateau 12 of the lower finger 7 in an inner area remote from thefinger tip and such that portion 10' of the flat bottom face 10 of the lower fin-ger 7 lies in a substantially horizontal plane.
Although being flexible, substrates 3 with time tend to wear the innerarea of the top plateau 12 down because of the sideways displacement.Hence, according to a preferred embodiment in said inner area the top pla-teau 12 comprises a wear resistant metal inlay 12' in level with the plateau 12as such (c.f. fig. 2).
When the desired position along the pile 4 is reached, if tilted before,the gripper 1 is leveled again. Then the upper finger 8 with its resilient pad 13is lowered onto said top substrate 3, thus gripping at least one substrate 3 forsubsequent handling between the resilient pad 13 of the upper finger 8 and acorresponding resilient inlay 12" of the flat top plateau 12 of the lower finger 7. The resilient inlay 12", which is in level with the top plateau 12 as such,and the smooth edge 15 slanting from the top plateau 12 help treating sub-strates 3 carefully, wherein the resilient inlay 12" and the resilient pad 13 to-gether are able to provide enough friction to enable safe handling even atmoderate gripping pressure levels.
Despite the above, when handling flexible substrates 3 there is alwaysa risk that these in some way become entangled with a gripper 1, for instancedue to static electricity. The effects of such an entanglement can be that sub-strates 3 are wrinkled during displacement sideways of a gripper 1 along apile 4 or that they are not properly released at the finish of a handling opera-tion. ln order to mitigate the risk of such entanglement, according to the pre-ferred embodiment of the gripper 1 according to the invention a plurality offirst gas nozzles 16 is arranged at the sharp edge 14 in an interface area be-tween the edge 14 and the top plateau 12. These first gas nozzles 16 serve todirect a flow of gas essentially in parallel with and away from the top plateau14, said gas cushioning contact between the substrates 3 and the sharp edge14.
Out of the same reason, although for cushioning contact between thesubstrates 3 and the smooth edge 15, a plurality of second gas nozzles 17 isarranged along at the smooth edge 15 along the fingertip 11. The second gasnozzles 17 are directed to blow gas (c.f. arrows G in fig. 3) essentially in pa-rallel with and away from the top plateau 12.
A single gas feed 18 suffices to provide gas to both types of nozzles16, 17, and it has turned out that ionized air is an excellent choice of gas as ithelps further mitigating problems arising due to static electricity. Further, thereis obviously no need of blowing gas other than when the gripper 1 is moved inrelation to or is releasing at least one substrate 3, wherein such releasing canbe further facilitated if the resilient pad 13 of the upper finger 8 is providedwith an air bleed duct 19 to safely avoid suction effects.
The person skilled in the art is aware that the preferred embodimentdescribed above can be varied in different ways within the scope of the ap-pendent claims. Hence, for instance the shape of the gripper 1 could be al- tered into a rectilinear instead of the curved one, and the edges 14, 15, whichare shown to be rising from a large bottom face 10 to a small top plateau 12,could instead be undercut if use is made of a small bottom 10 face and alarge top plateau 12. Further, the resilient inlay 12" of the top plateau 12 canbe made rotatable instead of or complementary to the rotatability of the resi-lient pad 13.
权利要求:
Claims (14)
[1] 1. A gripper (1) adapted to be used in an automated system (2) for handlingflexible substrates (3) provided in a pile (4), said gripper (1) being rotatablyarranged on an arm (6) of a robot (5) and comprising a lower finger (7) and anupper finger (8), wherein said lower finger (7) comprises a sharp, wedge-shaped edge (14), which is adapted to enable insertion of said lower finger (7)between substrates (3) of said pile (4), c h a r a c t e r i s e d in that saidlower finger (7) has a round tip (11), which extends to at least one side of thelower finger (7) and forms a smooth, wedge-shaped edge (15), and that saidsharp, wedge-shaped edge (14) is arranged on said at least one side remotefrom said tip (11) and substantially in level with but protruding further thansaid smooth, wedge-shaped edge (15).
[2] 2. The gripper (1) according to claim 1, wherein said wedge-shaped edges(14, 15) rise from a substantially flat bottom face (10) of said lower finger (7)towards a flat top plateau (12) of that finger (7).
[3] 3. The gripper (1) according to claim 2, wherein said bottom face (10) andsaid top plateau (12) are parallel.
[4] 4. The gripper (1) according to claim 3, wherein a tip part (10') of said bottomface (10) is tapering towards said top plateau (12).
[5] 5. The gripper (1) according to any of claims 2-4, wherein a plurality of firstgas nozzles (16) is arranged in an interface area between said sharp, wedge-shaped edge (14) and said top plateau (12), said first gas nozzles (16) beingdirected to blow gas essentially in parallel with and away from the top plateau(12).
[6] 6. The gripper (1) according to any one of claims 2-5, wherein a plurality ofsecond gas nozzles (17) is arranged along said smooth, wedge-shaped edge (10), said second gas nozzles (17) being directed to blow gas essentiallyaway from said rounded tip (11) in parallel with the top plateau (12).
[7] 7. The gripper (1) according to any one of claims 2-6, wherein said gas is io-nized air.
[8] 8. The gripper (1) according to any one of the preceding claims, wherein saidsmooth, wedge-shaped edge (15) extends around said tip (11) to both sidesof said lower finger (7).
[9] 9. The gripper (1) according to any one of the preceding claims, wherein saidsharp, wedge-shaped edge (14) forms an edge angle (A) within an interval of5-30°, preferably of 10-25°, and most preferably of 15-20°.
[10] 10. The gripper (1) according to claim 9, wherein said smooth, wedge-shapededge (15) is recessed in relation to the sharp edge (14), but rises to the topplateau (12) at the same angle (A) as the sharp edge (14) and coplanar withthat edge (14).
[11] 11. The gripper (1) according to any one of the preceding claims, whereinsaid top plateau (12) comprises a metal inlay (12').
[12] 12. The gripper (1) according to any one of the preceding claims, whereinsaid upper finger (8) comprises a resilient pad (13), which is arranged oppo-site to said lower finger (7) rotatably about an axis normal to said upper finger (s).
[13] 13. The gripper (1) according to claim 12, wherein said resilient pad (13) isprovided with an air bleed duct (19).
[14] 14. The gripper (1) according to claim 11 or 12, wherein said top plateau (12)comprises a resilient inlay (12") opposite to the resilient pad (13) of the upperfinger (8).
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法律状态:
优先权:
申请号 | 申请日 | 专利标题
SE1450358A|SE538951C2|2014-03-28|2014-03-28|gripdon|SE1450358A| SE538951C2|2014-03-28|2014-03-28|gripdon|
US15/129,600| US9844883B2|2014-03-28|2015-03-19|Gripper|
ES15769503T| ES2720549T3|2014-03-28|2015-03-19|Tweezers|
JP2017502563A| JP6588963B2|2014-03-28|2015-03-19|Gripper|
PCT/SE2015/050318| WO2015147724A1|2014-03-28|2015-03-19|Gripper|
EP15769503.2A| EP3122672B1|2014-03-28|2015-03-19|Gripper|
DK15769503.2T| DK3122672T3|2014-03-28|2015-03-19|LOOPER|
PL15769503T| PL3122672T3|2014-03-28|2015-03-19|Gripper|
TR2019/07624T| TR201907624T4|2014-03-28|2015-03-19|Gripping element.|
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