US2448136A - Stamping press for precision work - Google Patents

Description

J. A. CHAPPUIS STAMPING PRESS F012 PRECISION WORK Aug. 31, 1948.

Filed July 22, 1943 3 Sheets-Sheet 1 IPIIII u .n i

' luau-nu J'OHN ALBERT CHAPPUIS,

aid m Arrangivs Aug 31, 1948- J. A. CHAPPUIS 2,448,136

STAMPING PRESS FOR PRECISION WORK Filed July 22-, 1943 s Sheets-Sheet 2 INvENron JOHN ALBERT cHnPPu/s,

8v T a/W Avronnna Fig 6. f O

Aug. 31, 1948. O J. A. CHAPPUIS 2,448,136-

STAMPING PRESS FOR PRECISION WORK Filed July 22, 1943 a Sheets-Sheet 3 H9 5 Fig.8.

lmmvro Joan ALBERT cHAPPUIQ,

Patented Aug. 31, 1948 :2-;44s,1es: v SLTAZMPING'eh ssslronrnsoision' whim. -John-'mbertflliappiiis, Neuchatel, Switzerland swimsuit-my 2,2, 194%,. sense-1 1; y,

In, Germany February 29, 1.942

'Sectioris3 a a lirabuc Law sso eug st a, P-atent'eir pires February- "29*;11962 5 claims; (oldie- 3 i I'heobjectof the invention/isle, press,particu- I between uprights surmounting the saidtable' the linie'carrying the tools. 7

Pressesfof this kind usually support, the driving means-tor the rods on theJuprights by bearings, and" is: connected 'tolanl eccentric "with fly-wheel.

This; 'dispositionoi the-driving elements causes veryheamy'piecesito besupported -by the highest parts of the press, and thus over the workmans head,"which is irrational and dangerous, and'besides the fact that, the fly-wheet exposed to the air, 'stirs'un dust, this; construction has; other major defects.v I

for example; the distance or the hearings from the eccentric shaft "beingzdetermine'd by the distance between the: uprights, it: is. always too big and the. said shaft i-sz-thrown out of shape, by the effort necessary-for this, worlg, High stresses thus brought. about, are transmitted tothe said Wr htssu iec to tract-ionsttess; and to flexure, as, they are, also. transmitted to. the means; by whiohth uprights are, attached to, the table. For this reason, it is necessary to manufacture all tl-iese pieces-in;fixa gerafi y' bi sizes, W thout however being able. to prevent: them item yield.- inghowin to, elasticity-l and thus endangering the precision of work done. A

The-present invention: 65.095: away With-the. above mentioned disadvanta es; =azndtother disadvantages occurring in rpractioaql work. To; this. end the press", according: to. the; present. inyention,.-is fitted; with crankslpositionedron. a common and overhanging shait; which carries: one. on each sid eioi a hearing. the bearing. bein integral with the. table and. located under the some-.. The, connecting-rods cross; thez plane of the table to reach a link, to do which they ipass through; hollow upri hts.- in slots, the extremities elf-the; liznhentermg the slots in rder. to corme t with the said conn cting-reds; Y r

A; simpler way of constructin thisimess. would e o make.- the: table out. of a doublet-shaped the uprights, the the connecting-rods and the crank-strai terms, in:- thisicaser al-unitwhieh st'placed on at. OXrShBDQ 's pe t. nd their the driving urgent-15'time'vcbn'rtected with the driving means i as the motor; flt whelt gelati's ate.

1 will 'be "EPW915112. firemen 'lemtiodiment-fifiscribed later as am,eepmm ilie v no longer zany obliectf exce'pt to; guide the meme link,- the strain 7190 whtoirtney 'b'e i'mt not illflliemcing' the working or =tneipmss. 1 v Ii-he:-oonnectmgr-mdsraaion(e -longer that: arersubjectte a =bigztractiom stsess, butfitilsma'sy to carry them out in drawn 'ste'el; ofisuchwquwi'ty that; their eliastic deformation needs; "no *lohlger bet-taken into: considerations I 'beairing sf ilac'edi between the we 7 its maybe; made' i-n any sizetdesirct se'thet cattle-crank shatti-ilsrrenderew iraetiealiiiwhhpos' Thealnnexed drawing:showseiiembddiihent-"iii a. press aceording we the brestit "invention gweh btt'wasr ofexa'mple 1 ,r Fig. 1 is a tuill meevievm EigtrZlisraxsid'WBW-i Fig. 3 isyarplane 'viewr. v; Figx'. 4 *shdws alpabrtdi the 'iaiiitl time in cross-section. I L

Fig 5 explainsv the method esse'mblin g the Press. I Fig; fil'co'noerhs'aflniodificitieh Fig; 0 "SHOWS; finallythe dh'struet'ibnbfi ah ejector specially well adarfited 'w"they firssflfie soribedf Fig. 8 is al v iew seem ihthedi"oft iie arrows-molester. Q v

The pnessshoivm in nos: i to "4 iseomposewor the 'two uprights-fl asmr'z er-testable- 3 -wit mg 'cairyiiig platest sttaehed imd meatn; eliil ot 'the' stand; consistingofthe'bdx 'iooen s :tr'ont face to' allow controlvot'the-nr'ssq 'ilheqinl; s, I designed to street La rising 'sendlhg movement, is I and 2 which have towa rdsthe top communicating hollow kite exterior; h hand-wheel and' a, s meantime-position tithe; to hold. tools, also. M161? rights. I; rn'side ..theseuprights there. ar flash" site of: the. link 8,: o iih ctihi mds fi mtwo connecting-rods cross the 't's'tbi the-stand there ame crm I z. placed. otlr-hangingi rt either side stmnst'beamne. p ates: i ph elie i tQfQflQhzOfihfi! an. toathe'p hneofi the-emblem perpehdi E ch cr'me-hasmtemns tiiimm- .suponnted attachments;

"manner a gear I3 but could also be so made as tobe adjustable in position with regard to the gear.

A second shaft supported by bearings I4 in the lower extremity of bearing carriers 4, carries the gears l5 which drive the gears I3. The second shaft also carries a fly-wheel I6 and aconnecting and disconnecting device controlled by pedal I1, not a part of the invention. The press is driven by a motor I8. A hand wheel l9 makes it possible to drive the lower shaft supportedby the bearings I 4 so as to effect desired adjustments when the press is fitted with anew tool. I

The drawing shows, clearly, that the upper part of the press has neither fly-wheel nor drivingbelt, etc., and that the connecting-rods are entirely protectedby the uprights. 1

It-is also easy to see that the said. uprightsof I edwitha device for automatic advance of the 4 ticular a protective iron sheet designed to hide all the driving elements visible in Fig, 1, will be added, and in such a manner that the workman seated before the press cannot in any way come into contact with the aid organs.

To allow the free passage of a metal ribbon,

crossing the press in the sense of=arrow 24 of Fig.

1, the connecting-rods may be made according to Fig. 6. At the height where the metal ribbon relatively simple make, are not subject to any stress other than that arising from the slipping of link 6 and of carriage 8.

v The crank shaft I2 in the stand is so held in place by the bearing I I that in no case can it be deformed. Both the crank shaft I2 and the said hearing may be made in any size.

- The piece to be worked will be placed between the table 3 and the carriage 8. Durin the working operation, the two connecting-rods will be subjected to traction stress, with no ill effects, in view of the quality of steel'chosen for the manufacture of these: pieces. V

The cross section according to Fig. 4 makes it possible to see, seen laterally, the outline of bearing carriers 4 and the way in which they are connected with table 3. The whole may, for instance, be made of'steelplates electrically welded,

The plate constituting the table does not cover the whole of its right angle surface. The table has, on the contrary, two lateral notches or recesses 20, visible in Fig. 5, thus. giving the table 3 the general appearance of a double T.

This shape is necessary to allow assemblin of various constituent parts of the press.

, This assembling-is carried out in the following Table 3 is raised by bearin carriers 4 above the stand and is then fitted with the greater part of the Various elements situated under it, that is to say, the bushings, the shafts, the toothed wheels, the cranks, etc. v 1

Link 6 is kept in place above the table thus equipped and at a convenient height.

The two uprights I and 2 are then introduced and the connecting-rods 9 and ID are suspended therein. Thisintroduction is effected sideways so that feet 2i and 22slidein the same sense as the plane of; the table, in the recesses of this latter. At the same time, it isnecessary to be sure that the. heads of the connecting-rods join correctly on one handwith the cranks and on the 'oth'erwith the link. v w

. ,Th-e feet of the uprights are so shaped as to cover entirely the recesses of the table, but said feet could be so shaped as tocover said recesses in co-operati'on withspecial covers.

The connection between table and uprights may, for instance, be effected by bolting. A transverse beam 23 (Figs. 1 to 3) ensures the rigidity of the uprights. It may also be fitted by bolting. I When the upper parts of the press areassembled, as also the principal parts of the driving mechanism, all that remains to be done'is to place the whole on the stand and attach it. Assembling will be completed by arrangement of such elements as have not yet been introduced. In par- 25 crosses the press, the connecting-rod is broader', with a hole 26 through which the ribbon can pass in any position of the connecting-rods. The uprights naturally have corresponding openings 21. The connecting-rod of Fig. 6 is in its upper dead point. The press could of course be providmetal ribbon to be worked, it also carries a safety device not shown in the drawing.

Ejection devices, necessary for satsifactory functioning, could also be added. One of these devices shown in Fig. 7 deserves special attention.

In this figure, carriage 8 is again shown, par- .tially in'cross-sec-tion and a support 28 supposed to be part of the transverse beam 23, is likewise seen in cross-section.

Arranged transverse to this support is a rod 29 having a lower cylindrical portion 30, and an adjacent cone shaped portion 3|. The cylindrical and cone shaped portions are co-axial but eccentric in relation to the rod which can slide and revolve in support 28. Screws 28 serve .to lock the rod 29in the support 28. v

Opposite these elements, a roller 32 rises and falls as supported by a bell crank lever 33, pivoted at 34 upon the carriage 8. The extremity of this lever opposite to that where the roller is, presses on rod 35 for ejecting pieces retained by the tool carried by the carriage 8 upon its lower end.

The position shown is that of ejection, carriage 8 being near is upper dead point. Coming down, roller 32 will first rollalon the lower cylindrical part 38 of rod 29, then along the cone 3|, which will make lever 33 to'swing in an anti-clockwise direction as shown'in the drawing. Rod 35, subject for example, to the "action of a spring, will rise.

At each upward movement of carriage 8, roller 32' meets the cone, swings clockwise and provokes lthe ejection, then finishes its course along cylinder 30. l

=rIt isposs-ible to see that in raising or lowering rod 29, the exact moment may be regulated when election takes place and, from the fact that the axis of the rod 29 is eccentric with regard to the axis of the cylinder 30 and cone 3I, a rotation of rod 29 in support 28 will make it possible to modify the angle through which lever 33 will swing, that is to say t'heamp-litude of the ejection movement.

The construction described ensures a uniformly easy way to correct play since carriage 8 and link 6 are piloted in V-shaped slides. To obtain this, it suflices to slightly move the two uprights I and 2 toward one another. The distance between these uprights I andz is, first of all, determined, in erecting the machine, by the breadth of block 3'6 (Figs. 1 to 3) between the feet of said uprights. By lightly milling a lateral face of said block, the uprights positioned against it approach each other slightly. Beam 23, bolted, will not prevent this correction of play, nor will the lateral recesses 20 -whic-h will, to this end, be made larger than strictly necessary. l

- From the foregoing description it is clear that the present invention does away with the defects inherent in presses of this type known to date.

Manse 5. All driving elements, arelprotected, being situated in enclosed spaces, whereas the part above the table-is constructed'in a simple manner and lends itself particularly well to cleanand precise work, as especially required inthewatcmmaking industry.

As will be clear from the foregoing, link 6,

driven by the connecting rods; does not transmit its movement directlyto carriaget, but through thej'screw 1 v This is of particular advantage from the point of viewof regulating, and also ensures, perfect vertical piloting of, the carriage which in this way cannot undergo any lateral strain on acunt' r-the inclined position of the connectin mas. I a r It should be remarked that the said connectin rods are much longer than is usual in machines of this type so that their swing from one side to another from the vertical concerns a much smaller angle than is generally the case.

What I claim is:

1. In a forming press, the combination of, a table, a, pair of hollow uprights extending upwardly from said table in parallel relationship, a tool carrier member movable upwardly and downwardly having guide means thereon coopcrating with guide means on said upright members to slidingly support said tool carrying member between said uprights, means forming a hearing member disposed beneath said table and rigidly secured thereto, a crank shaft rotatably supported in said bearing means having an overhanging crank arm on each side of said bearing means, a link member extending between said uprights adjacent the upper ends thereof through slots provided in the upper ends of said uprights and connected to said tool carrying member for moving the same, and connecting rod means interconnecting said link and said crank arms extending through said hollow uprights for driving said link from said crank arms.

2. In a forming press, the combination of, a table, a pair of hollow uprights extending upwardly from said table in parallel relationship, a tool carrier member movable upwardly and downwardly having guide means thereon cooperating with guide means on said upright members to slidingly support said tool carrying member between said uprights, means forming a bearing member disposed beneath said table and rigidly secured thereto, a crank shaft rotatably supported in said bearing means having an overhanging crank arm on each side of said bearing means, a link member extending between said uprights adjacent the upper ends thereof through slots provided in the upper ends of said uprights and connected to said tool carrying member for moving the same, and connecting rod means interconnecting said link and said crank arms extending through said hollow uprights for driving said link from said crank arms, said table being formed in the shape of a double-T-shaped plate providing indentations on opposite edges thereof that cooperate with the hollow portions of said uprights and through which said connecting rods extend for interconnecting said link and said crank arms, each of said uprights having a foot thereon that cooperates with said table to form a part thereof.

3. In a forming pres-s, the combination of, a table, a pair of hollow uprights extending upwardly from said table in parallel relationship, a tool carrier member movable upwardly and downwardly having guide means thereon cooperating with guide means on said upright members 'to slidingly support said tool carrying member between said uprights, means formin a bearing member disposedbeneathsaid table-and rigidly secured thereto, a crank shaft rotatably supported "in :said bearing eans having an overhang-ing crank arm on each sideof said bearing means, a link member extending between said uprightsadj' acent. the upper ends thereof through slots provided in the upper endsof said uprights; and connected to saidrtool carrying member for moving the same, connecting rod'means interconnecting said link and said crank arms extel'id-v ing through said hollow uprights for driving said link from said crank arms, said table being formed in the shape of a, double-T-shaped plate providing indentations on opposite edges thereof that cooperate with the hollow portions of said uprights and through which said connecting rods extend for interconnecting said link and said crank arms, each of said upright-s having a foot thereon that cooperates with said table to form a part thereof, and a block positioned between the feet of said uprights to establish their spaced relationship when in position in said indentations in said table.

4. In a forming press, the combination of, a table, a pair of hollow uprights extending upwardly from said table in parallel relationship, a tool carrier member movable upwardly and downwardly having guide means thereon cooperating with guide means on said upright members to slidingly support said tool carrying member between said uprights, means forming a bearing member disposed beneath said table and rigidly secured thereto, a crank shaft rotatably supported in said bearing means having an overhanging crank arm on each side of said bearing means, a link member extending between said uprights adjacent the upper ends thereof through slots provided in the upper ends of said uprights and connected to said tool carrying member for moving the same, connecting rod means interconnecting said link and said crank arms extending through said hollow uprights for driving said link from said crank arms, the body of each of said connecting rods having an opening therein aligned with the opening in the opposite connecting rod and disposed adjacent the upper surface of the table through which a work piece can pass transversely through said connecting rods, and said uprights having openings therein in alignment with the openings in said connecting rods to receive the passage of a work piece extending through said connecting rods.

5. In a forming press, the combination of, a table, a pair of hollow uprights extending upwardly from said table in parallel relationship, a tool carrier member movable upwardly and downwardly having guide means thereon cooperating with guide means on said upright members to slidingly support said tool carrying member between said uprights, means forming a bearing member disposed beneath said table and rigidly secured thereto, a crank shaft rotatably supported in said bearing means having an overhanging crank arm on each side of said bearing means, a link member extending between said uprights adjacent the upper ends thereof through slots provided in the upper ends of said uprights and connected to said tool carrying member for moving the same, connecting rod means interconnecting said link and said crank arms extending through said hollow uprights for driving said link from said crank arms, an ejector mechanism carried upon said tool carrying member and having means projecting therefrom for engaging a REFERENCES CITED statlonary cam means carrled ad acent sald uprights, said ejector mechanism consisting of a, Th8 following references are Of record 111 the bellcrank lever pivotally mounted on said tool file Of this P 1 carrying member for rotation relatively thereto 5 UNITED STATES PATENTS having arm means extending therefrom for e-n- T gaging said cam means, and said cam means humber Name Date consisting of a cone shaped member rotatable 1,270,913 Wri'ght y 2, 1918 about an eccentric axis to change the rotatable 1,363,366 smlth 1921 movement of said bellcrank lever upon recipro- 10 7 Smith Apr. 5, 1921 cation thereof as carried by said tool carrying 1,407,869 KIOCRB Feb. 28, 1922. member. FOREIGN PATENTS JOHN ALBERT CHAPPUIS. Number Country Date 252,447 GreatBritain May 25, 1926

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