US2781533A - Machines for contracting the margins of sheet material - Google Patents

Description

Feb. 19, 1957 E. 'QUlNN MACHINES FOR CONTRACTING THE MARGINS OF SHEET MATERIAL Filed Oct. 14, 1955 12 Shets-Sheet 1 Edward Quinn 55 his Attorney E. QUINN Feb. 19, 1957 MACHINES FOR CONTRACTING THE MARGINS OF SHEET MATERIAL l2 Sheets-Sheet 2 Filed Oct. 14, 1955 Inventor Edward 691+ inn By hzs Attornqy Feb. 19, 1957 E. QUINN 2,781,533

MACHINES FOR CONTRACTING THE MARGINS OF SHEET MATERIAL Filed Oct. 14, 1955 12 Sheets-Sheet 3 Inventor Edward Quinn By his Attqrney E. QUINN 2,731,533

MACHINES FOR CONTRACTING THE MARGINS OF SHEET MATERIAL- Feb. 19, 1957 12 Sheets-Sheet 4 Filed Oct. 14, 1955 Inventor Edward Quirm By his Attorney Feb. 19, 1957 E. QUINN 2,781,533

MACHINES FOR CONTRACTING THE MARGINS OF SHEET MATERIAL Filed on. 14, 1955 12 Sheets-Sheet 5 Inventor Edward Quinn By his Attorney Feb. 19, 1957 E. QUINN 2,781,533

MACHINES FOR CONTRACTING THE MARGINS OF SHEET MATERIAL Filed Oct. 14, 1955 12 Sheets-Sheet 6 QUINN 2,781,533

MACHINES FOR CONTRACTING THE MARGINS OF SHEET MATERIAL l2 Sheets-Sheet 7 Feb. 19, 1957 Filed Oct. 14, 1955 Inventor Edward Quinn By his Attorney Feb. 19, 1957 E. QUINN 2,781,533

MACHINES FOR CONTRACTING THE MARGINS OF SHEET MATERIAL Filed Oct. 14, 1955 12 Sheets-Sheet 8 Fly I6 I L Inventor r Edward Quinn ZZZ Z2 .56

" By his Attorney E. QUINN Feb. 19, 1957 MACHINES FOR CONTRACTING THE MARGINS OF SHEET MATERIAL Filed Oct. 14, 1-955 12 Sheets-Sheet 9 Inventor Edwa r d Qu inn 4 z Av w w m 2 m 0 6 6 w a 9 2 2 L718 K. J 6 5/1 M 64 a 3. Fa r? Z W J mqn ..IIW/ a w. .M, z /0 J i i a Feb. 19, 1957 QUINN 2,781,533

MACHINES FOR CONTRACTING THE MARGINS OF SHEET MATERIAL Filed 001;. 14, 1955 12 Sheets-Sheet 10 Jay .23 5% w W4 nn% /2 /6 i illlll if I my lg,

282 //z Z 5 i W1. Fig. Z4 I Z5 1, 353 0 C) Z 0 6 56 i F 262 //Z 26 266 5. 5g O -04 W Q I 6Z Inventor Edd/a rd Quinn By his Atzf'orrzey Feb. 19, 1957 E. QUINN 2,781,533

MACHINES FOR CONTRACTING THE MARGINS 0F SHEET MATERIAL.

Filed Oct. 14, 1955 12 Sheets-Sheet 11 Inventor. Edward Quinn By his Attorney Feb. 19, 1957 NN 2,781,533

MACHINES FOR CONTRACTING THE MARGINS OF SHEET MATERIAL Filed Oct. 14 1955 12 Sheets-Sheet 12 Inventor Edward Quinn By his Attorney United States Patent MACHINES FOR CONTRACTING THE MARGINS 0F SHEET MATERIAL Edward Quinn, Saugus, Mass., assignor to United Shoe Machinery Corporation, Flemington, N. 3., a corporation of New Jersey Application October 14, 1955, Serial No. 540,441

25 Claims. (Cl. 1297) This invention relates to machines for crimping the margins of substantially flat pieces of sheet material to shorten said margins to predetermined lengths for causing the portions of the material adjacent to the margins to assume concavo-convex shapes. The machine herein illustrated is more particularly adapted to crimp and shorten the fore-part margin of a shoe upper to impart a pre-lasted shape to the upper, thereby facilitating the accurate fitting and attaching of the upper to a bottom member such as an insole and consequently also facilitating the subsequent assembly of such shoe parts with a last. It is to be understood, however, that in various novel aspects the invention is not limited to the particular embodiment hereinafter described.

In machines of this type ditficulty has been encountered in the past in crimping a piece of material so that the margin thereof would be uniformly crimped and shortened to a predetermined length. length have resulted in improper or difficult fitting and assembly of the work pieces to other accurately out parts;

An object of the present invention therefore is to overcome the problem of non-uniform crimping, thus resulting in savings in time and expense involved in the fitting of inaccurately crimped shoe uppers to mating Another object of the invention isto Inaccuracies in crimped from the application of heat, to harden the material while the work piece is still under the control of the machine, thereby eliminating the possibility of deforming the crimped margin. A further object of the invention is to provide means for varying the amplitude of the puckers to obtain a greater or lesser shortening of the crimped length of the work piece margin.

Various features of the invention, including novel details of construction and combinations of parts, will now be more particularly described with reference to the accompanying drawings and thereafter pointed out in the claims.

In the drawings,

Fig. 1 is a view in front elevation of the upper portion of one form of machine embodying the invention;

Fig. 2 is a view of the lower portion of the machine in front elevation;

Fig. 3 is a section on the line III-III of Fig. 2;

Fig. 4 is a plan view of the machine;

Fig. 5 is a view in front elevation of the machine with parts broken away;

Fig. 6 is a view partly in right-hand side elevation and partly in section showing parts of the crimping and table feeding mechanism;

Fig. 7 is a view partly in plan and partly in section.

2,781,533 Patented Feb; 19, 1957 away showing the crimping tool operating cam and the wiper operating cam;

Fig. 12 is a view similar to Fig. 9 showing the position of the 'parts after the feeding movement of the work table; a

Fig. 13 is a section substantially on line XIII-XI1I of Fig. 12;

Fig. 14.is a view partly in plan and partly in section showing the heated wiper and portions of its operating mechanism;

Fig.' 15 is a left-hand side elevation of the heated wiper and associated mechanism;

Fig. 16 is a section substantially on line XVI-XVI of Fig. 15;

Figfl7 is a view in front elevation with parts broken away showing the relation of the heated wiper to the I work supporting and guiding parts;

Fig. 18 is a view in front elevation with parts broken away showing the relation of the'heated wiper to the work margin supporting members;

Fig. 19 is a view partly in plan and partly in section showing bers;

Fig. 20 is a plan view, with parts broken away, of the work supporting and holding parts;

Fig. 21 is a view in right-hand side elevation of a tion of the machine on an enlarged scale;

Fig. 22 is a rear elevation of the work supporting and margin guiding members;

Fig. 23 is a rear elevation of the work supporting and gripping members;

Fig. 24 is a view partly in right-hand side elevation and partly in section showing the relation of the flange forming roll, the work table, and the heated wiper;

Fig. 25 is a view partly in right-hand side elevation and partly in section showing the mounting of the heated wiper;

Fig. 26 is a view similar to Fig. 24 showing the position of the parts during insertion of a work piece;

Fig. 27 is a view similar to Fig. 26 with the parts in work engaging position;

Fig.- 28 is a plan view of a portion of the machine operating on a work piece; I

Fig. 29 shows in rear elevation portions of the pucker forming elements and parts associated therewith as they appear in relation to a work piece when the elements are in their initial position;

Fig. 30 is a view similar to Fig. 29 showing the position of the parts after the downward stroke of the pucker forming tool but prior to the feeding movement of the work table;

the work supporting and flange forming mem- Fig. 31 is a view similar to Fig. 30 showing the posi Fig. 33 is a view similar to Fig. 30 showing the appearance of the work piece after formation of a series of puckers and during the wiping movement of the heated wiper;

Fig. 34 is a plan view of a forepart member of a shoe upper prior to the crimping operation;

Fig. 35 is a plan view showing the appearance of a forepart member of a shoe upper after the margin thereof has been crirnped and flanged;

Fig. 36 is a view similar to Fig 34 with a forepart thereof, the illustrated machine is provided with a work support-'2 (Figs.' 4 and 22-). The'support 2 consists of a substantially horizontal plate 6 secured to a slide 8 which is mounted for lateral adjustment in a dovetail slideway 10 (Fig 21) in a bracket 12. The lateral position of the work support 2 relatively to the'bracket 12 isdetermined by means ofan adjusting screw 14 in. the slide s arranged-to abut the left end of the bracket 12 as viewed in Fig. 22, the slide being clamped: in adjusted position by a clamping screw-161' Alsopivotally secured to the bracket 12 by a shoulderscrew '18 (Fig. 23.): is 'a gripper member 20 the purpose of which, will hereinafter appear. The bracket 12 is fixed by a screw 22 :(Fig. 22) man upstanding member 24 secured for heightwise adjustment on a carrier block 26 by a screw 28. The carrier block 26 is mounted in a. dovetail slot 31 (Fig; 6) formed in the upperend of a slide 32 which is mounted for vertical sliding movements in a bracket 34 attached to the front side of a machine frame 3. Thei-slotil'al'. is split by a downwardly extending clearance slot 33: whichallows the block 26 to be clamped in the slot 31 by two screws 30 (Figs. 1 and 6). A treadle rod 36:.threadedinto the slide 32 extends downwardly from the slide and is connected to a treadle 38 (Fig. 2)

Cooperating with the work support 2 for guiding the margin-of-the work piece is a margin guide 4 (Figs. 4 and 28) consisting of a vertical plate 64 (Figs. 19, 21, and 22) having a forwardly extending lip 65 and being secured by two screws 66 to an intermediate bracket 68 which in turn is secured for lateral adjustment on an L-shaped member 70 by a screw-72. The member 70 is mounted for forward and rearward adjustment in a groove formed in the upper end of a bracket 74 (Fig. 21) secured to an upstanding portion 76 of the bracket 34, the member 76 being secured to the bracket 74 by a screw 78. Therefore, by adjusting the member 70 on the bracket 74, the margin guide 4 may be adjusted forwardly or rearwardly to vary the position of the margin of the work piece in relation to the operating elements of the machine.

For the purpose of holding th work piece against movement during a portion of the machine cycle, the machineis provided-with-a presser foot 80' (Fig. 21) arranged to clamp the work piece against a beveled portion 82 (Fig. 23) of-the plate 6 of the work support 2. The presser foot 80 is mounted to swing about a shoulder screw 84 threaded into a bracket 36 which is secured to the bracket- 74 by two screws -88: A spring 98, extending froma rearwardly extending arm 92 of the presser foot to a pin mounted-inthe frame 3 urges the presser foot to swing in a counterclockwise direction, as shown in-Figl-ZL- to engage thework piece at the proper time. A stop member 94, secured for heightwise adjustment on-the=-bracket--86,'limits the motion of the presser foot when there is no work piece on the support 2.

As a work piece- W (Figs.-28 and 34) is intermittently 7 fed lengthwise of its margin, in amanner to be hereinby meansbf a lever 40 and a link 42 (Fig. 3). The

slide 32 is urged upwardly by a spring 44 which is confined. between the lower end of the slide and a sleeve 46 (Fig. 1) threaded into the lower end of the bracket 34'.-:- A. stop collar 48 clamped on the treadle rod 36 by a thumb screw 50 and arranged to engage the lower end of the sleeve 46 liniits the upward movement of the slide-32 and thus determines the heightwiseposition of the support 2 carried indirectly by the carrierblock 26.

Also mounted on= the. blocki26, by -a dovetail connection, is a bearing member 52 (Figs. 1 and '6) which is adjustable forwardly and rearwardly by means of an adjusting.screw-54 having both leftand right-hand screw threads threaded respectively in the bearing member and in thercarrier. blocki. A circular work table 56 adapted to support a portion of the work piece and having uniformly-spacedgrooves'58 (Figs. 6 and 28) around the periphery thereof, the purpose of-which will hereinafter appear, isrotatably: mounted in the upper portion of the bearing member 52.; Mounted on a bracket 60 (Figs. 18 and 23.) secured :to the member 52, is an arcuate work support 62 which is concentric with and extends around a :portion of the table 56. To provide for convenient placement-of .awork piece before and after being operated, on by the machine, a table '63 (Figs. 1 and 4) is mounted adjacent to and surrounding the front portion of=thecircularwork table 56, the table 63being secured by: screws .67 :to a bracket-69 mounted :on the A front side of the carrier block 26. Since the work support 2, the circular table 56, the arcuate work support 62, and the table 63 are each carried by the carrier block. 26, it:may be seen that by depressing the treadle 38 againstithe action of the spring 44, the work supporting elements of the machine will be lowered to facilitate the insertion or removal of a work piece.

after described, being so guided by the support 2 and the guide 4, the margin of the-work piece passes under a crimping-tool1%(Figs. 6 and 29). The crimping tool: 1001's moved down in timed relation to the feeding movements ofthe workpiece to form a pucker therein byforcingthework piecemargin over an edge of the support .2 ina direction normal to the supporting surface. Prior to the downward movement'ofthecrimping tool, theiwork engaging surface of the gripper 20 is yieldingly; maintained in a position substantially flush with the .beveled portion 82 on the support 2 to engage the lower. surface of thework piece directly under the crimping' tool 100. The gripper20 is maintained in position by a spring..102z(Fig. .23)-which extends from an arm 104 ofthegripper to a pin 105 in the bracket 74 and which swings the gripper in -a counterclockwise direction as viewed in. Fig. 23 .until the arm 104 contacts a stop meniber=106vfixed to the bracket 12. As the crimping tool :100 forces the margin of the work piece down, as viewed in. Fig. 30, the gripper Ztlacts to clamp the work Piece against. the lower end of the tool and is moved down by :themotion of the tool acting through the work piece and against theaaction of the spring 102- The effect of the combinedaction of the tool and the gripper on theworkpiece .isto advance the work piece along the work support; and down over the edge of the plate 6 ad jacent to, the bevel, 82 to form a puckerin the margin of the work piece. Also. as the tool 100 moves down, an adjustable abutment 108 (Fig. 21) on a carrier arm 110 contacts the arm 92 of the presser foot 80 to depress-the ar-mend raise :the presser foot toallow the work piece {C be moved by the actionbfthe crimping tool and gripper.

At the lower limit of the downward motion of thecrimping tool, the pucker formed in the work piece is partially forced by the tool into one of the peripheral grooves 58 inlhecircular work table 56, as illustrated in Fig. 30. At this time the table 5 6 is stationary and maintained in position by meanshereinafter to be described so that one of the grooves 58 in the table is in position to receive the pucker. A fter forming a pucker in the work piece, the. crimping -tool,. while holdingtheformed pucker in one when 5 of the grooves 58, moves lengthwise of the marginof the work piece .to the right, as viewed in Fig. 3.1. At'the same time the table is rotated .at the same speed as the tool so that the .tool holds the pncker in a groove while the table feeds the work piece. As the tool moves to the right, it moves away from the gripper 21) which is then swung up by the spring 102 (Fig. 23) to its initial position, thus imparting a slight drag to the work piece adjacent to the crimping tool. After losing contact with the gripper, the puckerjstill engaged by the crimping tool, is moved by the table 56 on to the arcuate work support 62 which will support the lowersurface of the pucker in cooperation with the circular work table while the upper surface of the pucker is subsequently engaged by a heated wiper 112 (Figs. 14 and 18). After the feeding motion of the work piece, the crimping tool 190 rises vertically and returns to its initial position as illustrated .by broken lines 31. During the return movement of the crimping tool, the heated wiper 112 is caused by means hereinafter described to move to the left, as indicated by broken li'nes in Fig. 31, to apply heat and pressure .to the formed pucker for imparting a permanent set to the formed material.

For imparting the pucker forming and feed following movements ,to the crimping tool 1 0, the tool is clamped to the carrier arm 110 (Figs. '5 and ,6) by a'screw 114-1111? plate 115. For imparting a lateral feed-following movemerit to the crimping tool, the arm 11!) is mounted'to swing about a pin 118 carried in one end of a-lever 120. An L-shaped member 122 (Figs. 6 and 7) secured to the rearward side of the arm 110 is arranged to engage a ,chrn 124 on a shaft 126, the member 122 being ,yieldingly held agains't'the .cam by a spring 128 extending from ,a Pin 130 in the am .1111 to a pin 132 in the frame 3 adjustable stop screw 133 defines the initial lateral position'of the arm 110 and hence of the tool 100 for alinenient ofthe tool, during its downward movement, with one of the grooves 58 in the circular table.

For imparting a .vertically reciprocating pucker forming movement to the crimping tool 100 through the carrier arm 110, the lever 120 is carried by a rockshatft 1351 (Figs. 4 and which is journaled in apart of the frame 3'. A oam llever 1136, fixed to the rearward end of the rockshaft, has on its lower end a cam roll 138 (Fig. 11) riding in atrack 140 in a cam wheel 142 fixed to the shaft 126. A motor 144 (Fig. 2) having a pulley 146 drives a belt 148 which runs on the pulley 14.6 and a pulley 150 (Fig. '4) on the rearward end of the shaft 126 to drive the shaft in a counterclockwise direction as viewed in Fig. 11. Rotation of the shaft causes the track 1411, acting through the cam lever 136, the lever 120, and the carrier arm 110 to move the crimping tool 100 in a direction riormalto the surface of the work piece while'caus- "tag the cam 124 acting through the member 122 and the carrier arm 11% to fswing the'tool 100 lengthwise of .the margin of the work piece in timed relation to the normal movements of the tool. The effect of these combined motions is to cause the crimping tool to traveliin a rectangular path along a plane normal to the surface of the work piece. Thus at the beginning cycle of the machine, the tool travels down to form a puck'er in the work piece; then at the end of its downward movement, the tool moves laterally with the feeding movement of the work piece. At the end of its lateral feeding movement, the tool moves up and then laterally to return to its initial position. It may be'seenthat'b'y raising or lowering the initial position of the 'crimping tool 161) relative to its carrier arm 111) thatthere will be more or less lost motion of the tool before it contacts the work piece during the pucker forming movementof the tool. By raising the tool'on'its carrier arm, a smalleramount of the vertical motion of the tool will be effective to forma pucker in the work piece resulting in a pucker of less amplitude causing ,alesser for'eshortenin-g of the margin of the work piece. By lowering the tool on its carrier arm, vmore of the vertical motion of the tool wi l be effecti e o form a Pu er of re ter amp i ude resulting in a reater f reshortenin o h wo p ece mar For altsma v feed ng and ho d ng the ircular work t b e fi'; the ma hine i pr ide wit a fee n pawl 1 5 2 and a hold n paw 5 (F h h ar adapte t 'fen a etbe ro vs 5,8 nt 'p rip ry o the tab ehe eed n wl .5 i m un o f w a rea w s d n .mqyement n a slide ay 5, f m d n an upstanding portion 157 of a slide 15 8 which in turni s mounted for oscillatorys lidin g movements on an arcuate o et l s idewai' lfifiwnq ntr h the o ble 5 and fo med in a c os m mbe 6 (Fi he ro m mber l l7 dbY s rew 16.6 b tw n e u an ng o t n 760:1? t e b acke 4 an a s m a p ion 164 s 5 an 91 11 16 ame a ke A Pin 6 (Fi .8 nd 9) in h feeding awl 15 ex n s t rqv h l 70 i n si of th ga de 1 o t e li e 8 a has attached tt s eto 1 mins 72 whic extends t am e p hea Pi .71% fixe t th re s 9 t s i e 5.

r 1 n e P 68 qnstanfl o u g he P?W :1. .IYK% T l3 ?WY from hr e ta l 6 to a position determined by a surface 175 (Figs. 8 and 13) are tpawlqper il' m mb 7 The m mb 6 is k cal adjustment on a block 173 secured ta {1 Q P 1d, 'f ?F@k? (P e .6) i s se e o the Pe rie a m 1.? b a ew 17 e member 176 being secured to the block by a screw (Fig. 8). Ihus, it may be seen that when the crimping tool es down with the arm 110, the pawl operating'memher 176 also moves down and the forwardly inclined surface 175 on the member 176 causes the feeding pawl 152 to he moved forward against the action of the'spring I172 to engage ohe ,ofthe grooves 58 in the table 56 as shown trig 3 7.. v

For moving the slide 158 along its rslideway 160 for cansing the feeding pawl 152 to impart a feeding motion to the circular table 56, the bracket 177 has secured thereto another block 180 (Fig; 6) which carries a rod 182 having asubstantiaflly ball shaped end 184. The end 18 1 of the rod is received in a slot 186 (Fig; 9) formed by one sideof theportion .157 of the slide 158 and an offset plate 138 mounted on'the same portion, thereby connecting" the slide 158 to the'carrier arm 110. "Thus, as the crimping tOoLbeingcarri'ed by the arm 110,"-is moved lengthwise or the margin of the work piece," .the slide 158 and hence the pawl 152 likewise are moved by the rod 182 but in an arcuate path concentric with the circular work table 5 6. Since at this time the feeding pawl 152 is held forward by the member 176 in eng gernent with the work table 56, the work'table is rotated by the pawl' in timed relation to the movement of the crimping tool. i

for-positioning and holding the work table 56 in proper relationito the crimpingtool 101) so each of "the grooves .58 in the table is in position to receive each successive pucker as it is formed 'by the tool, the holding pawl 154, adapted to engage successively each groove, is pivotally mounted in a slot 19!) (Fig. 13) formed in the lower portion of the cross member 162 to swing about a pin 192 in the cross memben A torsion spring 194 mounted on the pin 192 and engaging atone end a surface 196 on the cross member and at thei'opposite end engaging a pin 1 98 in a rearwardly extendingarm 200 of the pawl 154 urges the pawl to swing in a counterclockwise direction as viewed in Fig. 13 to a position either engaging a groove in the table or as limitedby engagement of theupperend of the arm 200 with a rearwardly inclinedsu'rface 202 on the pawl operating member 176. Thus it maybe seen that as the downward movement of the member 176 causes the feedingpawl 1152 to move forwardto engage one ofthe grooves 56 in the table 516, it also .causes'the holding pawl 1 55ttoswing rearwardly, abon'tthe pin 1'92 and out of engagement with the same groove iiithetable. As the slide 158; its fe edingpawl (152, and the member 176 reach the limit of their table feeding movement, the member 176 loses contact with the arm 200 and the spring 194 swings the holding pawl 154 forwardly to engage the next adjacent groove in the table. As the crimping tool is moved up during its return movement, the feeding pawl 152 is moved rearwardly by its spring 172 out of engagement with the table 56. At the same time the holding pawl 154 serves to prevent movement of the table and also serves to position the next groove 58 for receiving the next pucker formed by the crimping tool.

For applying heat and pressure to the puckered portion of the work piece for imparting a permanent set to the puckered material, the heated wiper 112 (Figs. 14 and 18) is arranged to overlie the arcuate work support 62 and the adjacent peripheral portion of the circular work table 56 which has the grooves 58 formed therein. It should be noted again that after formation, each successive pucker is received in one of the grooves 58 in the work table and is supported from below by both the table and the arcuate work support. As the work piece is fed by the table 56 after formation of a pucker, the wiper 112 is moved in an arcuate path in the same direction and speed as the work piece thus applying no wiping action at that time to the work piece. However, at the end of the feeding cycle and while the crimping tool is returning to its initial position, the wiper 112 moves to the left, as viewed in Fig. 31, to wipe over and apply heat to the newly formed pucker. At this time, the Work table is held stationary by the holding pawl 154, and the presser foot 80 is holding the work piece down against the sup-.

port 2, thus effectively preventing any lengthwise motion of the work piece.

For performing the heating and pressing operation, the wiper 112 is formed at the forward side of a block 204 (Fig. 14) which contains a heating unit 206 connected to a suitable electrical circuit for supplying heat to the wiper. The block 204 is secured to a plate 208 by screws 210 but is separated from the plate by insulating spacers 212 (Fig. 15) to confine the heat to the wiper and its block. The plate 208 has formed on the under side thereof an arcuate dovetail 214 (Fig. 17) which is mounted for arcuate sliding movements in a dovetail slideway 216 formed in the upper side of a member 218, the slideway being concentric with the work table. To limit the clockwise movement of the wiper 112, as viewed in Fig. 14, the plate 208 is provided with a stop screw 220 threaded into a depending lug 222 secured to the plate, the stop screw being arranged to contact the forward side of the member 218 (see Fig. 15 The member 218 is secured at its rearward side to a bracket 224 (Fig. 15 which is mounted for lateral adjustment by a dovetail connection on a forwardly extending bracket 226, the bracket 224 being clamped in adjusted position by a clamp screw 228 in the bracket 226. The bracket 226 has a rearwardly extending portion 230 which is mounted for forward and rearward adjustment on a lug 232 formed on a substantially U-shaped arm 234 (Figs. and 21), the bracket 226 (Fig. being secured in adjusted position by a plate 233 clamping the portion 230 to the lug 232 by a clamp screw 235. The arm 234 (Fig. 5) is mounted for forward and rearward swinging movements about a pin 236 and a pin 238, both pins being secured in alined bores 237, 239, respectively, in the frame 3. A spring 240 (Figs. 5 and 21) extending from a pin 242 in an extension 244 of the arm to a pin 246 in the frame 3 causes the arm 234 to swing rearwardly to a position limited by engagement of a stop screw 243 in the arm with the frame 3. Thus, by means of the above-described wiper carrying mechanism, the wiper 112 is capable of upward yielding movement against the action of the spring 240 and the initial heightwise portion of the wiper is determined by adjustment of the stop screw 248 in the arm 234. It may be seen by a comparison of Figs. 24 and 27 that the initial heightwise position of the wiper is determined by adjustment of yield up against the action of the spring 240 in order to accommodate passage of the work piece under the wiper, thus applyinga definite amount of pressure to the work piece as determined by the tension of the spring.

For moving the wiper 112 laterally with the feeding motion of the work piece in timed relation to the movement of the work table 56, the block 180 (Fig. 6) mounted on the bracket 177 and carrying the feed mechanism operating rod 182 also carries a bar 250 having mounted thereon an abutment 252 (Fig. 14). The abutment is arranged to contact an extension 254 on the right end of the plate 283, as viewed in Figs. 14 and 17, and during its feeding movement the arm acting through the abutment 252 moves the plate 208 on its slideway 216 in a counterclockwise direction, as viewed in Fig. 14. Thus, through the above-described mechanisms, the table 56, the crimping tool 100, and the wiper 112 all move together in timed relation during the feeding movement of the work piece.

For moving the wiper in a reverse direction after the feeding movement of the work piece to apply heat and pressure to the newly formed pucker in the work piece, the plate 208 has mounted at its rearward side an upstanding member 256 (Figs. 14 and 15) having formed thereon a lug 258 which is arranged to be engaged by an extension plate 260 (Figs. 10 and 14) secured to an arm 262. The arm 262 is mounted for transverse swinging movement about a shoulder screw 264 (Figs. 8 and 10) which passes through the lower end of the arm and which is threaded into a bar 266 secured to the upstanding portions 76 and 164 of the bracket 34. Midway of its ends the arm 262 has therein a transversely inclined slot 268 which receives a forwardly extending pin 270 on one end of a lever 272. The lever 272 is carried by one end of a rock-shaft 274 (Fig. 11) which is journaled in a part of the frame 3. A cam lever 276 fixed t0 the other end of the rock-shaft 274 carries at its outer end a roll 278 riding in a cam track 280 in the cam wheel 142 on the shaft 126. Rotation of the cam shaft 126 causes the track 280 acting through the cam lever 276, the lever 272, and the pin 270 to swing the arm 262 and its associated extension plate 260 clockwise, as viewed in Fig. 10, after the work piece has been fed. Clockwise movement of the extension 260 acting on the lug 258 (Fig. 14) causes the plate 208 and its associated wiper 112 to be moved along the slideway 216, thus moving the wiper over the upper surface of the newly formed pucker to impart a permanent set to the puckered material along the margin of the work piece. To accommodate any reverse crowding of the material which might cause a back feed of the work piece during the wiping operation, the arcuate work support 62 is provided with a depression 277 as seen in Figs. 23 and 33.

After the setting operation performed by the heated wiper, the puckered margin of the work piece is soft and pliable from the application of heat and therefore may be easily deformed. To avoid accidental deformation of the work piece, the machine is provided with a cooling iron 310 (Figs. 4 and 28) which is adapted to dissipate heat from the hot marginal portion of the work piece so that the puckered material will quickly cool and harden. The iron is arranged to engage the upper surface of the work piece as it moves from under the heated wiper not only to dissipate heat from the material, but also to prevent deformation of the work piece while being hardened. For this purpose, the iron 310 is adjustably secured by a screw 312 (Figs. 1 and 4) to a member 314 which is also adjustably secured by a screw 316 to an arm 318. The arm is mounted for vertical swinging movements about a pin 320 carried in the upper end of a bracket 322 which is secured on the front side of the bracket 34. A light spring 324 extending from the arm 318 to a pin in the bracket 322 urges the arm to swing in a clockwise direction as viewed in Fig. 1 to cause the iron to rest yieldingly on the upper surface of the hot puckered marginof the work piece as seen memes in Fig. 28. In this manner, the puckered margin of the work piece is cooled and hardened while still under'the control of the machine and before any accidental deformation of the margin can take place.

For forming a flange F (Figs. 35 and 37) along the puckered margin of the work piece, as well as to bulge the body of the work piece upwardly to preshape the work piece, the machine is provided with a forming roll 282 (Figs. 4 and 27). The roll normally lies adjacent to and cooperates with the heated wiper 112 to bulge the body of the work piece upwardly at substantially right angles to the margin of the work piece engaged by the wiper, as shown in Fig. 27. The roll rotates freely on a shoulder screw 284 threaded into one end of a plate 286 (Fig. 19) having at its opposite end a depending lug 288 secured to a lever 290 (Fig. 21) by screws 292. The lever is mounted to swing about a shoulder screw 294 threaded into a block 296 fixed to the carrier block 26. A spring 298 extending from the lever to a plate 300 secured to the bracket 74 urges the lever to swing about the screw 294 in a clockwise direction, as viewed in Fig. 21, to a position limited by an adjustable stop screw 302 in an arm 304 of the lever 290, the stop screw being shown in Fig. 26 to facilitate the insertion or removal.

of a work piece from the machine.

The manner of the normal operation of the machine will now be briefly summarized. After closing the electrical circuit to the heating unit 206 to heat the wiper 112, and starting the motor 144, the operator depresses the treadle 38. Depression of the treadle moves the carrier block 26 down with the slide 32 against the action of the spring 44, thus lowering the work supporting elements comprising the work support 2, the circular work table 56, the arcuate work support 62, and the table 63 to facilitate the insertion of a work piece into position to Also, as the carrier.

be operated on by the machine. block moves down, the lever 290 swings forward to move the forming roll 282 away from the heated wiper to enable the work piece to be inserted under the wiper. While the work supporting elements are in a lowered position, being so maintained by depression of the treadle, the

operator positions the margin of the work piece against the margin guide 4 (Fig. 28) with the body of the work piece resting on the work support 2, the circular work table 56, and the table 63. At this time, the pucker o forming and work feeding means are going through their operating cycle but are ineffective since the work piece resting on the work supporting elements is in a lowered position as determined by depression of the treadle.

When the work piece is properly positioned in operating position, the operator releases the treadle causing the work supporting elements to be raised by the spring 44 to their operating positions as determined by the en-' gagement of the stop collar 48 with the lower end of the sleeve 46, the forming roll 282 also swinging rearwardly to operating position adjacent to the heated wiper 112.

At the beginning of the pucker forming cycle of the machine the presserfoot 80 is held down by its spring 90 (Fig. 21) to clamp the work piece against the beveled portion 82 of the work support, thus effectively preventing movement of the work piece while the crimping tool 100 is raised, as seen in Fig. 29. At this time the work engaging surface of the gripper is yieldingly maintained by its spring 102 in a position substantially flush with the beveled portion 82 on the work support to engage the lower surface of the work piece directly under depresses the arm 92 (Fig. 21) of the presser foot to raise the presser foot for releasing the work piece to the action of the tool. Continued downwardmovement of the crimping tool forces the margin of the work piece down over the edge of the work support, the gripper 20 "acting at this time to yieldingly clamp the work piece against the lower end of the tool. The effect of the combined action of the tool and the gripper is to ad-- vance the work piece along the work support and down over the edge of the plate 6 adjacent to the bevel 82 to form'a pucker in the margin of the work piece. At the lower limit of the downward movement of the crimping tool, the pucker formed in the work piece is partially forced by the tool into one of the peripheral grooves 58 in the circular work table 56, as illustrated in Fig. 30. At this time the table 56 is held stationary by the hold ing pawl 154 (Fig. 9) so that one of the grooves is in position to receive the pucker. Also, as the tool moves down, the member 176' (Fig. 13) moving down with the carrier arm 110, engages the arm 200 and the rearward end of the feeding pawl 152, causing the holding pawl to swing rearwardly out of engagement with the table and causing the feeding pawl 152 to move forward into engagement with thet'able in preparation for the feeding movement of the circular table. 1

After forming a pucker in the work piece, the crimping tool,'while holding the formed pucker in one of the grooves 58, moves lengthwise of the margin of the work piece as viewed in Fig. 31, the tool being so moved by the cam 124 (Fig. 11) acting through the member 122 and the carrier arm 110. As the crimping tool, being carried by the arm 110, is moved lengthwise'of the work piece margin, the slide-158 (Figs. 8 and 9) mounted on its slideway 160 and carrying the feeding pawl 152, is moved by the rod 182, also carried by the arm 110, in an arcuate path concentric with the circular work table. Since at this time the feeding pawl 152 is held in engagement with the table 56, the table is rotated by the pawl in timed relation to the lengthwise movement of the crimping tool. Thus, while the tool holds the pucker in a groove, the table feeds the work piece. As the tool moves with the work piece, it moves away from alinement with the gripper 20 which is then free to be swung up by the spring 102 to its initial'position, thus imparting a drag to the work piece adjacent to the crimping tool to assist in forming the next pucker. After losing contact with the gripper, the pucker is moved by the circular work table onto the arcuatework support 62 which in cooperation with the table will support the lower surface of the pucker, while the upper surface of the pucker is engaged by' the heated wiper 112. As the work piece is fed by the table 56, the wiper is moved in an arcuate path at the same speed and in the same direction as the work piece, thus applying no wiping action at that time to the work piece, the wiper being so moved along the slideway 216 by the abutment 252 (Fig. 14) moving with the carrier arm and engaging the extension 254 on the wiper block carrying plate 208. Thus, during the feeding cycle of the machine, the table 56, the crimping tool 100, the wiper 112, and the work piece all move together in unison. As the slide 158, its feeding pawl 152, and the member 176 reach the limit of their feeding movement, the member 176 loses contact with the arm 200, allowing the spring 194 to swing the holding pawl forward to engage the next groove in the table. At the same time the feeding pawl 152 is moved rearwardly by its spring 172 out of engagement with the table 56, and the holding pawl serves to prevent movement of the table and also serves to position the next groove 58 for receiving the next pucker formed by the crimping tool. While the crimping tool is returning td its-initial position, the wiper 112 .is moved to the left as viewed in Fig. 31 to wipe over and. apply heat to the newly formed pucker for permanently setting the pucker in -the work piece material. At this time the work table is held stationary by the holding pawl, and the presser foot 80 is holding the work piece down against the sup port 2, thus effectively preventing lengthwise motion of the work piece.

After the setting operation performed by the heated wiper, the puckered margin of the work piece, due to the progressive feed motion, moves from under the heated wiper to be'engaged by'the cooling iron 310. The cooling iron serves to dissipate heat from the hot margin of the work piece so that the puckered material is cooled and hardened before any accidental deformation of the work piece margin can take place. While the work piece is being fed under the wiper, the forming roll 282 lying adjacent to and cooperating with the heated wiper serves to bulge the body of the work piece up at substantially right angles to the margin of the work piece engaged by the Wiper to form a flange F along the puckered margin of the work piece, as well as to impart a prelasted shape to the body of the work piece.

When the desired portion of the work piece has been crimped, the operator depresses the treadle, causing the forming roll to be moved forwardly away from the wiper and causing the work supporting elements to be lowered so that the work piece may be removed from the machine.

While the invention is herein illustrated as applied to a machine for crimping the forepart margin portion of a shoe upper, it is to be understood that the machine shown is merely a preferred embodiment which has been shown and described for illustrative purposes only.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent of the United States is:

-l. in a machine for crimping the margin of a piece of sheet material, a work support, means operative intermittently in cooperation with said support for forming "a pucker in the margin of a work piece, and feeding means operable intermittently in timed relation to the operation of said puckering means for holding said work piece stationary while said puckeringmeans forms a pucker insaid work piece and for advancing said work piece lengthwise of its margin after formation of said pucker whereby a succession of uniform puckers is formed step bystep in the margin of said work piece.

2. in a machine for crimping the margin of a piece of sheet material, a work support, means operative intermittently in cooperation with said support for forming a pucker in the margin of a Work piece, feeding means operable intermittently'in timed relation to the operation of said puckering means for holding said work piece stationary while said puckering means forms a pucker in said workpiece and for advancing said work piece lengthwise ofits margin after formation of said pucker whereby a succession of uniform puckers is formed step by step in the margin of said work piece, and'rneans for permanently-setting the puckers formed in said margin.

3. In a machine for crimping the margin of a piece of sheet material, means operable in'directions normal to the fiat surface of a work piece for forming a pucker of predetermined amplitude in the margin of said work piece, and feedingmeans operable intermittently for advancing said work piece lengthwise of its margin after formation of said pucker whereby a succession of uniform puckers is -formed step by step'in the margin of said workpiece to shorten said-margin to a predetermined length.

4. In a machinc for crimping thcmarginof a piece of sheet material, a' work support, a crimping tool operable in directions normal to the surface of a'wo'rk ;pie'ce'for forming a'puckerin the 'margin of said workipiece, and feeding means operable intermittently to hold'said work piece stationary while said tool forms a pucker and to stationary while said tool forms a pucker and to advance said work piece after formation of said pucker whereby a plurality of puckers is formed step by step in the margin of said work piece to shorten said margin to a predetermined length, and means for controlling the elfectiveness of said tool to vary the amplitude of the puckers formed thereby whereby the predetermined length of said margin may be varied.

6. In a machine for crimping the margin of a piece of sheet material, a work support, a crimping tool operable in directions normal to'the surface of a work piece for forming a pucker in the margin of said work piece, feeding means operable intermittently to hold said work piece stationary While said tool forms a pucker and to advance said work piece after formation of said pucker whereby a plurality of puckers is formed step by step in the margin of said work piece to shorten said margin to a predetermined length, and means for permanently setting the puckers formed in said margin.

7. In a machine for crimping the margin of a piece of sheet material, a work support, a crimping tool operable in directions normal to the surface of a work piece for forming a pucker in the margin of said Work piece, feeding means operable intermittently to hold said work piece stationary while said tool forms a pucker and to advance said Work piece after formation of said pucker whereby a plurality of puckers is formed step by step in the margin of said work piece to shorten said margin to at predetermined length, and means to apply heat and pressure to the puckered margin of the work piece to set the puckered material permanently.

8. In a machine for crimping the margin of a piece of sheet material, a work support, a crimping tool operable in directions normal to the surface of a work piece for forming a pucker in the margin of said work piece, feeding means operable intermittently to hold said work piece stationary while said tool forms a pucker and to advance said work piece after formation of said pucker whereby a plurality of puckers is formed step by step in the margin of said work piece to shorten said margin to -a predetermined length, means to apply heat and pressure to thepuckered margin of the work piece to set the puckered material permanently, and means to cool and harden the puckers after the application of heat and pressure by said setting means.

9. In a machine for crimping the margin of a piece of sheet material, a work support, a crimping tool operable in directions normal to the surface of a work piece for forming a pucker in the margin of said work piece, feeding means operable intermittently to hold said work piece stationary while said tool forms a pucker and to advance said workpiece after formation of said pucker whereby a plurality of puckers is formed step by step in the margin of said work piece to shorten said margin to a predetermined length, and means tostretch and bulge the portion of the workpiece adjacent to the puckered margin thereby forming a' flange along .said margin and preshaping the body of the work piece.

' 10. In a machine forcrimping the margin of a piece of sheet-material, a work support, a-crimping tool, operating means for-movingwsaid tool, in' directions normal to the surface, of a workpiece for causing. said toolto form a pucker inithe margin of said. work piece, feeding means operable intermittently in timed;relation to the move-- menttof said :tool whereby the workpiece is held stationary whilesaid operating means causes said-toolto-form tion of said pucker whereby a plurality of puckers is formed step by step in the margin of said work piece to shorten said margin to a predetermined length.

11. In a machine for crimping the margin of a piece of sheet material, a work support, a rotatable circular table having notches around the periphery thereof, a crimping tool operable in directions normal to the surface of a work piece on said support and said table for form ing a succession of puckers one at a time along the margin of said work piece, means operable intermttently and adapted to engage said table for successively locating each notch in said table in a position to receive a pucker formed in the margin of said work piece by said crimping tool, means for intermittently rotating said table after formation of each pucker for advancing saidwork piece, and means for operating said locating means and said table rotating means in timed relationship whereby a plurality of puckers is formed step by step along the margin of said work piece thereby shortening said margin to a predetermined length.

12. In a machine for crimping the margin of a piece of sheet material, a work support, a rotatable circular table having notches around the periphery thereof, a crimping tool operable in directions normal to the surface of a work piece on said support and said table for forming a succession of puckers along the margin of said work piece, a holding pawl adapted to engage said table during the pucker forming movement of said tool whereby each notch in said table is successively located in position to receive a pucker formed by said tool, a feeding pawl adapted to rotate said table after formation of each successive pucker to advance the work piece, and means to operate said holding pawl and said feeding pawl in timed relationship whereby a plurality of puckers is formed step by step along the margin of said work piece thereby shortening said margin to a predetermined length.

13. In a machine for crimping the margin of a piece of sheet material, a work support, a crimping tool, means for moving said tool in directions normal to a surface of a work piece for causing said tool to form a succession of puckers in the margin of said work piece, means for moving said tool lengthwise of said margin after formation of each pucker, a rotatable circular table having notches around the periphery thereof adapted to receive each pucker as it is formed by said tool, and means for holding said table while said tool forms a pucker and for rotating said table in timed relation to the lengthwise movement of said tool to advance said work piece lengthwise of its margin after formation of said pucker whereby a plurality of puckers is formed step by step along said margin thereby shortening said margin to a predetermined length.

14. In a machine for crimping the margin of a piece of sheet material, a work support, a crimping tool, means for moving said tool in directions normal to a surface of a work piece on said support for causing said tool to form a succession of puckers in the margin of said work piece, a rotatable circular table having notches around the periphery thereof adapted to receive each pucker as it is formed by said tool, and means for intermittently rotating said table about an axis extending perpendicular to the surface of said work piece in timed relation to the action of said tool for holding said work piece stationary while said tool forms a pucker and for advancing said work piece after formation of said pucker whereby a plurality of puckers is formed step by step in the margin of a work piece thereby shortening said margin to a predetermined length.

15. In a machine for crimping the margin of a piece of sheet material, a work support, a crimping tool, means for moving said tool in directions normal to a surface of a work piece on said support for causing said tool to form a succession of puckers in the margin of said work piece, a rotatable circular table having notches around the pc- I ,.14 ripheryrthereofnadapted formed by said tool, means for intermittently rotating said table about an axis extending perpendicular to the surface of said work piece in timed relation to the action of said tool for holding said work piece stationary while said tool forms a pucker and for advancing said work piece after formation of said pucker whereby a plurality of puckers is formed step by step in the margin of a work piece thereby shortening said margin to a predetermined length, a member cooperating with said table to support the puckers formed in the work piece, and heated means operable after each pucker is formed to press said pucker against said member and said table thereby permanently setting the puckered material. V

16. In a machine for crimping the margin of apiece of sheet material, a work supportf'a crimping tool, means for moving said tool in directions normal to a surface of a work piece on said support for causing said tool to form a succession of puckers in the margin of said work piece, a rotatable circular table having notches around the periphery thereof adapted to receive each pucker as it is formed by said tool, means for intermittently rotating said table about an axis extending perpendicular to the surface of said work piece in timed relation to the action of .said tool for holding 'said work piece stationary while said tool forms a pucker 'and for advancing said work piece after formation of said pucker whereby a plurality of puckers is formed step by step in the margin of a work piece thereby shorteningsaid margin to a predetermined length, a member cooperating with said table to support the puckered margin of said work piece, a heated wiper adapted to engage said puckered-margin, and means operable after formation of each pucker for moving said wiper to press'each pucker against said member and said table I and to apply heat to'each pu cker thereby permanently setting said puckered margin,

17. In a machine for crimping the margin of apiece of sheet material, a .work support, a crimping tool, means for moving said tool in directions normal to a surface of a work piece on said support for causing said tool to form a succession of puckersin the margin of said work piece, a rotatable circular table having notches around the periphery thereof adapted to receive each pucker as it is formed by said tool, means for intermittently rotating said table about an axis extending perpendicular to the surface of said work piece in timed relation to the action of said tool for holding said work piece stationary while said tool forms a pucker and for advancing said work piece after formation of said pucker whereby a plurality of puckers is formed step by step in the margin of a work piece thereby shortening said margin to a predetermined length, a member cooperating with said table to support the puckeredmargin ofsaid work piece, aheated wiper adapted to engage said puckered margin, means operable after formation of each pucker for moving said wiper to press each pucker against said member and said table and to apply heat to each pucker thereby permanently setting said puckered margin, and means to cool and harden the puckers set by said wiper.

18. In a machine for crimping the margin of a piece of sheet material, a work support, a crimping tool, means for moving said tool in directions normal to a surface of a Work piece on said support for causing said tool to form a succession of puckers in the margin of said work piece, a rotatable circular table having notches around the periphery thereof adapted to receive each pucker as it is formed by said tool, means for intermittently rotating said table about an axis extending perpendicular to the surface of said work piece in timed relation to the action of said tool for holding said work piece stationary while said tool forms a pucker and for advancing said work piece after formation of said pucker whereby a plurality of puckers is formed step by step in the margin of a work piece thereby shortening said margin to a predetermined length, a member cooperating with said table to support o. re eiv ea ,..p ck .,a t is,

greases the p ckere ma g of .sais W r Pi??? a hea ed e adapted to' e n'gagesa-id puckered margin'n eaiseperaeie after formation of e'a'chpu'cker formoving said wiperto press each pucker against said memberand said table and to app-1y heat to each'pucker thereby permanently setting said puckered margin," and means cooperating with said wiper to stretch and bulge the portion of the work piece adjacent to the puckered margin thereby forming a flange along the margin of said work piece. 19. In a machine for crimping the margin er a piece of sheet material, a member having a surface arranged to support the marginal portion "of a work piece, means operative to displace said work piece over an, edge of said member in a direction normal to said supporting surface to form a pucker in the margin of said work piece, and means operative intermittently .to hold said work piece during formation of said pucker and to advance said work piece lengthwise of; its margin after formation of said pucker whereby a series of puckers may be'formed step by step along said margin thereby shortening said margin to a predetermined length.

20. In a machine for crimping the margin of a piece of sheetmaterial, a member having a surface arranged to support the marginal portion of a work piece, means operative to displace said work piece over an'edge of said member in a direction normal to said supporting surface to form a pucker in the margin of said work piece, means operative intermittently to hold said "work piece during formation of said pucker and to advancesaid work piece lengthwise of its margin after formation of said pucker whereby a series of puckersmay be formed step by step along said margin "thereby shortening said margin to a predetermined length, and rn eans for permanently setting the puckers formedffin sai "margin; '21. In a machine for jcrimping thejmarginiof apiece of sheet material, a member having a surface arranged to support the marginal portion ofa work piece, means operative todisplace said work piece over an edge of said member in a direction normal to 'saidsupporting surface to Emma pucker'in themargin [of said work piece, means operative intermittently tohold said work piece during formation of said PUQkS and to advance said work piece lengthwise of its margin after formation of said ucker whereby a' series of puc kers maybe formed step by step along said margin thereby shortening said margin to a predetermined length, and means to apply 'heat and pressure toeach pucker to permanently set the puckered material.

22. In a machine for crimping the margin of apiece of sheet material, a memberhavingaf surface arranged to support the marginal portion of'a work piece, me ans operative to displace said workpiece over anedgeof said member in a direction ncr-rnaljto said supporting surface to, form a pucke-r in the margin of said workpiece, means operative intermittently to hold said work piece during formation of said pucker and to advance said work piece lengthwise of its margin after formation of said pucker whereby a series of pnckers may be formed step by step along said margin thereby shortening margin to a predetermined length, and means to stretch and bulge the work piece adjacent to its puckered margin thereby forming a flangealong said margin.

23. In a machine for crimping the margin of a piece of sheet material, a member having a surface arranged to supportt'he marginal portion of a work piece, means operative to displace said work piece over an edge of saidmember ina direction normal to said supporting surface to form a pucker in the margin of said work piece, means operative intermittently to hold said work piece during fioirmation of said pucker and to advance said work piece lengthwise of its margin after formation of said pucker whereby a series of puckers may be formed step by step along said margin thereby shortening said margin to a predetermined length, means to apply heat and pressure toeaoh pucker to permanently set the puckered material, and means to cool and harden the puckered material a fterthe application of heat and pressure by said setting means.

24; In a machine for crimping the margin of a piece of'shee't material, a work support, a crimping tool movable in directions normal to the plane of a work piece on said st -PP fl; a yieldable clamping member arranged to clamp a portion of the margin of said work piece against'said tool, means for moving said tool in said directions to displace normally tofsaid plane a small area of said margin against the resistance of said member for forming a" pucker in said margin, and means for intermittentlyadvancing-the work piece'lengthwise of its margin after for nlaticin of said pucker whereby said tool may forma series of nniformpuckers stepby step along said 25 In a machine for crimping the margin of a piece of sheet material, "awork support, a crimping tool operable in directions normal to the plane of awork piece on said support, a 'yieldableclamping member arranged to clamp aportion-of"the' margin of saidwork piece againstsaid tool, means for moving said tool insaid directions to dis place'normally to said plane a smallarea of said margin against the resistance of said member for forming a pucker in said margin, meansfor intermittently advancing the work piece lengthwise 'of its margin after formation ofsaiid pucker whereby saidtool' may form a series of puckers step by step along said margin, and means'for'perrnanent-ly 'settingthe puckers formed in said margin.

No references cited.

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