US1915910A - Stop-motion device - Google Patents

Description

June 27, 1933. 1 E. B. ALLEN ET AL STOP-MOTION DEVICE original Filed April 24, 192el 5 'sheets-sheet 1 IN V EN TORy Edward wall/@Zier Allen View A TTORNEY June 27, 1933. V E. B. ALLEN ET AL 1,915,910

STOP-MOTION DEVICE Original Fi1ed`April 24, 1928 5 Sheets-Sheet 2 IN V EN TORS Edward /Zelz BY "af /lfaler @wir ATTORNEY June 27, 1933. E. B. ALLEN ET Al. 1,915,910

STOP-MOTION DEVICE original Filed April 24, 1928 5 Sheets-sheet 3 IN V EN TORS du/Wd bAZ/elz,

and

A TORNEY June 27, 1933,1 E, B. ALLEN ET AL 1,915,910

STOP-MOTION DEVICE Original Filed April 24, 1928 5 Sheets-Sheet 4 June 27, 1933.

E. B. ALLEN ET AL v STOP-MOTION DEVICE Original'Filed April 24, 1928 5 Sheets-Sheet 5 INVENTORS Edward Alle@ BY md l/ZzZ/ef' '/Yyefnr v ATTORNEY y 3Q be operated to lprovide a stop-motion device,

Patented June 27, 1933 UNITED STATES AlAT`E`-`1fr orns EDWARD R. ALLEN, on NEw'rowN, AND wALrnRiyivnRs, on RRIDGRZPORT, coifmnorrour, AssreivoRs 'ro THR SINGRRMANUFAOTURINGsolarium, or Rnrzannrmnnw JERSEY, A coRroRATIoivon NRW'JRRSRY x l STOP-MOTION Dnvrcn' l J .Original application'led April 24,1928,ISeria1 N0. 272,416,1an'd in VGrreat"Britain May 30,` 1928. Divided and this application led February 23, 1929. Serial'No. 342,069; z a

y used is shown' in the patent to Allen,

This invention relates to devices for yS'topl ping machines, such as sewing. machines, at

a predetermined time and with-the parts in a predetermined position.'

, 'One form of stop-motion device commonly No.

743,213, of Nov. 3, 1903. Ithcomprise's a` l stop-cam fiXedftothel driven machineshafft and formed with, an4 yecfvxent-ric-portion n tollowed by aHstop-notch; such cambeing connected through buffer-spring meansto the plunger and nally required driven sha-ft. tilting stop-motion lever carrying a spring-pressed plunger is arranged to move the plunger sidewlseto a position within range of the eccentric-pon tion of the stop-cam which depresses the permits ,the plunger to rise into the stopsnotch,l thereby abruptly stopping the shaft and locking it in a predetermined position. The` shock of stop-v ping the movingparts of the machine is borne by he 1cuiller-spring means between the stop-cam and the machine shaft. This shock is in the nature of a sharp hammer blow/ and is suchthat quite a strong buffer-spring is to absorb it. Known stop-motions of this character are aispeed-limiting factor of machinesy to which they are-applied. In fact a machine with such a stop-'motion must yat a moderate speed or-,consid erable difliculty is eXperienced with bufferspring breakage and distortion or undue wear on the parts. c v f The present invention has for an object which will machine speeds with increased production, and in which the shock of stopping the machine is materially reduced and buffer-spring breakageis overpermit of higher come. Another object of the invention'is to adapt the stop-motion device Jforuse more particularly with buttonhole sewing machines in which the power for operating the buttonhole cutter isy derived from the moe mentum of themachine acting preferably through the stop-motiondevice after the machine isdisconnected from its driving means; a further object being to secure increased for operating the buttonhole cutten power y' CStill"hirther, the invention has for' an object to prot/'idea stop-motiondevice inzwhich the time-period in which the stop-motion le# ver may be tripped to secure proper cooperation of the parte 1s broadened, thus render-v itvunnecessary to ladjustwthe tripping time with as high a degree ofjaccuracy. as

To the attainment of the ends in view, the usual stop-camvof the stop-motion device, instead of being mounted upon the drivenfshaft of the machina-is associated preferably with an idly running gear meshing with a' smaller pinion Xed to the driven shaft, whereby the stopfcamis caused to run, say,-at onefhalf motion lever being moved laterally from its oldposition below the mainfshatt, to its Since* the new position below the gear. stopfcam runs y athalt its formerspeed, it follows that the machinehas twice the timeto run under its own momentum from the time the power is thrown oli until the positivestop comes into play. 1 This increased coasting time results in an: absorption of energy by friction in the machine bearings and a lessen-` ingy ofthe energy tof-be absorbed by the stopmotion device. m Furthermore, the character of they blow imparted to thefYbuer-spring means is changed. lnsteadpf being in the nature of a sudden or shar'phammer blow, itis more like a push and can ybe better absorbed by the buli'er-spring withy less strain upon the latter. Still further, ywhen applied to a buttonhole sewingmachine of the type where lthe'buttonhole cutter is operated by the down-motionof the stop-plunger under the influence ofthe*eccentric-portion ofthe usual stop-cam, the two-to-one reduction gearing gives increased power. for cutting the buttonhole, as may-'be desirablel with heavy materials or., when cross-seams'are encountered. f- .M ;.4 .y In .the accompanying drawings, Fig. l

vis a. side =elevation of abuttonhole sewing mae l bottom plan View of the machine. Fig. 3 is a rear end elevation of the machine. Fig. 4 is a disassembled perspective view of the idly running gear and'associated parts, including the stop-cam. Fig. 5 isa top plan'view of the upper parts of themachine carried "by the bracket-arm. Fig. 6 is a section, on an enlarged scale, on the line.6-6, Fig. 1.- Fig. 7 is asection on the line 7-7, Fig. 5. Fig1`8 is a section on the line 8-8, Fig. 5. Fig. 9 is a transverse vertical section through the machine bed and bracket-arm, showing the driving connections for the feed-wheel which latter carries the usual stop-motion trippingpoint, and Fig. is a transverse section through the stop-motion lever.

As described in our copending application, Serial No. 272,416, filed April 24, 1928, of which this application is a division,'the invention is illustrated in its preferred embodiment in a sewing machine having a bed 1 from which rises the standard 2 of the bracket-arm 3 terminating in the head 4 in which the usual needle-bar 5 andbuttonhole cutter-bar 6 are mounted. The needle-bar 5 carries the usual eye-pointed needle 7 which cooperates `with the usual shuttle mechanism 8 to form the buttonhole stitches. The cutter-bar 6 has fixed to its lower end the usual buttonhole cutting knife 6 which, at the end of the sewing operation, is projected downwardly to cut the buttonhole slit.

The needle and' shuttle mechanisms are driven in the usual manner from the mainshaft 9'which is j ournaled within and length- Wise of the bracket-arm 3 and carries at its rearward end the tight and loose belt-pulleys 10 and 11. The pulley 10 has an elongated hub 12 in which gear-teeth are cut forming a pinion 13; the hub 12 being fixed to the main-shaft 9 by means `of the taper-pins 14 disposed on opposite sides of the pinion 13 and bearing a 90O angularrelation to one another, as shown in Fig.v 6. The loose pulley 11 is journaled on the bushing 15, Fig. 7, which is confined to rotate with the shaft 9 by means of the ypin 16 which enters a notch 1.7 in the bushing.

The sewing machine frame is formed at the bend of the bracket-arm, adjacent the upper end of the standard 2, with a boss 18 which is laterally offset from the rear main-shaft bearing 19 and has fixedthereto the stud-pin 2O on which is journaled the gear-wheel 21 meshing with the pinion 13. As will be noted in Figs. 3 and 5, the stud-pin 20 is parallel to the main-shaft 9 and is disposed substantially at the level of such main-shaft 'being merely displacedto one side of the latter. The gearwheel 21 has a forwardly extending hub 22 on which is journaled the usual' stop-cam 23 having the eccentric stop-plunger-depressing portion 24 followed by the stop-notch 25. The stop-cam 23 has fixed thereto a pin 26` which extends through a slot `27 in the face of the gear 21 and has yfitted thereon a block 28. The block 28 is disposed within the cavity 29, Fig. 4, of the gear 21 and there isl also fixed within the cavity 29 a second block 30; a pair of buffer-springs "31 being disposed within the cavity 29 between the fixed .abutment-block 30 and the movable block 28. A cover-platel 32 closes the cavity 29 and is held thereon by screws/33.; 'The screw 34 holds the entire gear-wheel assembly on `the stud-pin y20.

Mounted on the standard 2, at the base of the latter, isthe bracket35 having .spaced arms 36 for the trun-nion-iscrews 37 which support the tilting stop-motion lever 38 formed at its upper end with alateral arm 39 carrying the belt-shipper fork 40. Mounted to slide vertically in the stop-motion lever38 is the usual stop-plunger 41 which is pressed upwardly by the spring 42. When `the -stopmotion lever 38 is in'running ordotted line position, Fig. 1, the upper end of the plunger 41 is disposedlforwa'rdly ofthe cam 23 and is out of range of the latter. When the stopmotion lever 38 assumes its stopping or full line position, F ig. 1, the plunger 41 is moved to a position under or within range of the cam 23, whereupon the eccentric-portion 24 of such cam first depresses the stop-motion upon at the end of the -sewing cycle by theV tripping-point 49 carriedfby thefeed-wheel 50; the feed-wheel being connected in the usual manner to move the work-clamp 50 on the bed 1 to feed the work.

Fixed to the stop-motion plunger 41 b means of the screw 51 is the horizontal balr 52 carrying at its outer end the roller 53 entering the slot 54 in the rearward end of the lever 55 which is fulcrumedat 56 onthe standard 2. The lever 55 is connected in the usual mannerv to the cutter-bar 6 by means of the link 57, lever 58 The link 57 has pivoted thereto at 60 the the stopl and link 59.

'loo

ilo

lower end of the latch 61 having at its upper end a shoulder 62 which engages under the pin 63 carried by the lever 58 and passes through the: slotted upper end of the link 57. This is the usual manual release, disclosed'insaid Allen Patent No. 743,213, for preventing the operation` of the cutter-bar by the stop-motion device; the releasebeing eiected by manually swinging the link? 6l main-shaft "Y frame. and extending bracket-arm, of a pinion fixed to saidmain-j shaft, a. gear larger thanl said pinion and meshing 'with the latter, said gear being jour-3 which is given a step-by-step motion by the pins 7l carried by'the beveljgear 72 whichv meshes with the main-shaft 9.-y l.

llt-will be noted from the foregoing del scription that the ypowerfor driving the ma'- chine is ynot transmitted through the gearing i8, '21, but-is transmitted directly from they pulley 10 to the main-'shaftv 9, the gearl which carries the stop-cam 23 r running idly without noise or wear and tear while the machine is in operation. A The tripping'point 48 should be adjusted to release the stop-motion lever 38 at a time when thegconcentric or low portion of the stop-cam 23 is adjacent `the upper end of the plunger-bar 4l. On the cam'23 there is an angular space of about 90 where the tripand permit the plungerpinginay take place bar 41 to pass under the cam for engagement by the eccentric cam-portion 24. As the cam 23 lis geared to run at-half the speed of the 9, it follows that the ymain-shaft may turn through a space of 180 or twice as far as would bepermissible were the'cam 23 mounted' on the main-shaft. Hence it is not necessary toadjust the setting of the tripping' point 48 toY the degree :of accuracy heretofore required. n

It is foundthat with the-*present stopmotion device lighter buffer-springs may be used with increased machinespeed and, due to the more gradual character of the blow absorbedby such buffer-springs, breakage of the latter is eliminated.

Having thus set forth the nature ofthe invention, what we claim herein is l. In a stop-motion device, theLcombination with a sewing machine frame having a bed, a standard and an overhanging bracketarm, and a main-shaft journaled in said lengthwise of `the naled alongside themain-shaft, a stop-cam,

the driving pinion 73 fixed vto abuifer spring connectingsaid stop-cam to said gear, tight and loose belt-pulleys on said main-shaft, a belt-shipper lever fulcrumed onv said standard, and an vupwardly springpressed stop-plunger carried by said lever in a position displaced to one sideof a vertical atively .related to said stop-cam.

2.' A stop-motion device having, in combination, a-driven machine shaft, a pinion fixed on said shaft, tight and loose belt-pulleys on said shaft, a gear-wheel larger than said pinion andmeshing with the latter, said gearwheel being journaled to run alongside the driven shaft while the machine is in operation l.and being formed in its rear face with a buffer-spring' cavity, buffer-spring means disposed in said cavity, a stop-cam mounted adacent said gear-wheel and connected to rotate with the`r latter through said buffer-springV means, stopping means movable into and out offengag'ement with saidstop-cam, and a belt-shipper connected to move with .said stopping means.

3.- Ina stop-motion device, the combination Awith ay driven shaft, of a-tight belt-pulley fixed to said shaft and having an elongated y hub formedfintegrally with pinion-teeth, af l loose belt-pulley vjournaled on said shaft alongside the tight belt-pulley, a.k gear wheel planethrough'` the main-shaft and cooperlarger than said pinion, said gear-wheel being journaled at one side of the driven shaftand meshing With-said pinion-teeth, a stop-cam, abuffer spring connecting said stop-cam to said gear-Wheel, a stop-element cooperativelyk related to said stop-cam, and a belt-shipper connectedto said stop-element.v

4. In a stop-motion device, thecombination with a driven shaft and tight and loose..

pulleys on said shaft, ofa pinion fixed to said shaft, a gear larger than said pinion, said gear ,meshing with said pinion kand being formed with a buffer-spring cavity, buffersprlng means in said cavity, a .removable `cover-plate closing'said cavity, aistop-cam associated Withsaid gear and connected to the latter through saidfbufer-spring means,

a lstop-element cooperatively related to saidrv stop-cam, and a belt-shipper connected to move with said stop-element.` y i l In testimony whereof, we

names to this specification.

, y vEDVVARD BALLEN.

. WALTER'MYERS.

l U5 have signed; our i

Images