US2983240A - Sewing machines - Google Patents

Description

W. ENGEL SEWING MACHINES May 9, 1961 5 Sheets-Sheet 1 Filed June 22, 1956 W. ENGEL SEWING MACHINES May 9, 1961 Filed June 22, 1956 5 Sheets-Sheet 2 y l,255; M' 9 W. ENGEL SEWING MACHINES May 9, 1961 5 Sheets-Sheet 5 Filed June 22. 1956 r anni@ 52@ A f WW w W. ENGEL SEWING MACHINES May 9, 1961 5 Sheets-Sheet 4 Filed June 22, 1956 @SMQ Q @hwkm May 9, 1961 W. ENGEL 2,983,240

SEWING MACHINES Filed June 22, 1956 5 Sheetsheet 5 Jnven/or:

United States Patent v a SEWING MACHINES v wolfgang Enger, Bielefeld, Gemany, signor-fo Phoenix- VVNahmaschinen A.G. Baer & -Rempel, Bielefeld,A Germany ' Y Fried June zz, 1956, set-.N0 593,246 i Claims priority, vapplication Germany June 25, 1955 vSClaims. (Cl. 112-158) This invention concerns a method for the production of Vforwardly and rearwardly running decorative seams and machinesfor carrying out the method.

Y More particularly, the invention relates to a method for the production of forwardly and rearwardly running decorative seams of the nature of button-hole edgings and to Van automatically Ycontrolled sewing meachne, suitable for the purpose, laterally. A l Y In the production of Vdecorative seams on automatically controlled machines intended for the purpose, it is often required that the decorativeseam should not be, made tofadvance inv one direction, 4but? should be carried4 for-7 wardly and rearwardly... For example1 Vthisis the case in the production of buttonfholes inwhich firstly the border bounding the one edge ofthe button. hole is to be formed and then, with oppositelydirectedfmovement of the mawith aneedle bar which swings out lPatented May 9, 1961 stantly in driving connection with the camshaft, whereas the cams for the stitch position and/or the stitchlength and/or the variation of the stitch width can be coupled selectively to the camsshaft. Theuncoupling may then bev effected automatically by such shaping of the cams that they themselves release theconnection to the cam; shaft at the end of theprescribed movement.

The previously known zig-zag sewing machines for th production of button holes, in whichA the material-is clamped fast and is positively controlled, are simply one purpose machines of complicated construction. The feed dog executes a quadrangular movement and carries the material along intermittently by friction. When sewing a button hole, it is thus practically impossible, as already indicated, Vfor the light and left borders to possess the same number of stitches. Y

Inl contrast, the invention permits of the provision of a universal zig-zag sewing machine of simple construction in which manual control means and automatic control meansware used, in one vWorking operation, for changing the adjustment on the machine, whereby the aforesaid diiiiculties can be avoided. Y

By way of example of an embodiment of the invention; the drawings show a decorative-stitch control unit o f a button-hole sewing machine in which disc cams of a tpye known perse operatethe needle-bar rockers. The inventioncan, of course, also be utilizedfin sewing machines terial, the border bounding the other edge of the button hole. In thisw however, certain diiculties arise, for instance due to the fact: that the material is not conveyed in precisely the samefashion by the feed device-the material foodV dog-in' the ltwo .directions of. movement. The decorative seam'would therefore requireu aV different number or arrangement of lstitches for the forward move? ment than for the'retur'n and its end does not terminate cleanly at the commencement whenthe previously known automatically acting `zig-zag sewing machines aresused` Similar difficulties alsofarise .with Yother forwardly and rearwardly running decorative l f The invention accordingly Vprovides, remedies in that both theautomatic control andalso manual control: are employed, during the formation of seam,y to bring about' thenecessary` adjustments f of the. machine, that is particularly the adjustment of thel size of oversttch or stitch wiclth,` the position of. Stitch regionand the amountaridl direction. of the feed'moye'inent.. f

commencement ofrthefselcond'border arefeffectedjnde autQmatic'-, controlwithl iorward opera-firm :of the; ,naming a@ @any die. sewn@ bfdtlis. cpmpleteeby mamar wat@ withforwagnrop ,'QThI'e sewing' machine f f l carrying lout* the method! of oveif'from iautoritatie" control AtolV control, that isY itfcaifbe'switched overfroriiv 'ne 'mode 'of operation to the other, "duringfstitchprodction. K Preferablypthe sew? ing machine has cams* forl controlling the tvdthof2 the When sewing. huttoni-holesfthisf be *.etcted, iiipar-VL the=invention is'so constru ed thatit ofchangeV f stitcln-the position-of the stitcli,the lengthof the stitch Y i and the variation Vof the stitch width;y of which Vcams fone a least can be seletivery c uptettoits camshaft. Suitb'ly, however, this selective 'cupling to YtheV camshaftJis prngiaeaufra pijural'ity f the taidfcmarsay in'rsueha @am fhatrfthe eamfi'for the stitchwidth raf withVV a decorative-stitch control unit inwhich the disccamsautomatically control the setting means of a zig-zag device. l In the drawings: Figure 1 represents the front elevation 0f a sewingi machine arm with ay control unit for the production of decorative stitches and for the automatic production of button holes, Figure l-a is a detail showing the connection of the mechanism to the' feed dog setting shaft, v

Figure 2 the stitch-setting lever mechanism in side elevation, Figure 3 a section on the yline III-III in Figure 6,- asseen in the direction of the arrows, Figure 4 a section on the line IV--IV in Figure 6, as seen'in the direction of the arrows, Figure 5 a ysection on the line V-V in Figure 6 as seen inthe direction of the arrows, j F'gure 6 the plan view ofthe arm with the control unit, Y Y

Figures"7 to 9 indicate the positions of the cams 7,

8 and 9 and also the positions of the levers co-acting with and 9 and alsothel positions of the levers co-acting therewith, at the commencement of the second locking, 'l Figure 13 represents the hand lever 47 and its cam surface 48, Y 1

Figures" `14 to. 16 illustratethe manner of operation f of the Vclutch, "Figu'reflliar representing, 'in chain lines',-

a=partialelvation, corresponding to Figurevl4to a larger Figure 'l \7-sliows' Ya diagrammatic representation of a button-holefseanis'uch as is produced with the various working positions of'Figures 7 'to 13, f Figure 18 -is an exploded view, of the` clutch and earn mechanism. 'y L Mounted-in the arm 1 of the sewing machine, in `accordance with Figure 1is the arm shaft 2 which drives tlie'carnsliaftv 5-by way` of vthe worm 3 and wormwheel,V 4.V This shaft Svis rotatably mounted in a sleeve 5' se cured to anged'sleeve 6 fastened by screws 6 to support plate- 6`which is secured b y' screws and suitable anges to the arm:v 1.' Interchangeably` disposedjon the-canili shaft` 5`(Figuresf7,` 8 and9),areY the cam disc7'which? i lateral deliection to tionpfgthe needle. 'I'he cam 7 is connected to the cam shaftl by a key and groove and is secured against axial displacement by a ball 7" biased into groove 5f in shaft by spring 7'. The cams Sand 9 are arranged securely o n a clutch bushing 10 by key and groove means and are secured against axial displacement by a lock ring Clutch bushing 10 is mounted freely on the camshaft i and on its lower end face, as more clearly shown in Eigure or Figure 14, teeth 11 which can enter into corresponding tooth gaps 12 in a flange 13 of the cam shaft 5. The cam 7 for the lateral deection of the needle cooperates with the oscillating lever 14 (Figures 5 to 7) which rocks about the pivot 15 xed on the support plate 6. The cam S for influencing the amount and direction of the material feed co-operates with the bell-crank lever 16, (Figures 4 and 6) which rocks about the pivot 17 xed on the support plate 6. The lever 16 has the longitudinal slot 13 in which the pin 19 (Figure 6) can be displaced. The nutV 20 is provided for securing the `adjusted position'of this pin. Secured to this pin 19 is a steel band 21 which runs over the guide roller 22 and is operatively connected tothe setting lever 23 rigidly mounted on the lsetting shaft 24 (Figure 2). Under the action `of the spring 2 5 (Figure 1), by lway of lever 23 and the steel v band 21, the lever 16 bears resiliently against the cam surface of the cam disc 8. Setting shaft24 is rocked as determined/bycarn 8 by way of bell crank lever 16,` band @Land setting lever 2310 control the material feed as described in U.S. Patent No. 2,846,966. To make it pos-V sible, when sewing without automatic action, to render theaction of the cam 8 on the setting mechanism o f the feed device ineliective and thereby to change over, in accordance with the invention, to hand control, the guide roller 2.2. can be lowered. This is effected by the same lever 26 (Figure 2) with'which the amount and direction of the feed are adjusted by hand. 'Ihis hand lever 26, which has an angularly extending member 26 and, which is mounted in the arm 1 at the joint 27, carries the cam 2S on which bears the pin 29' likewise mounted yin the `arm and connected firmly to a fork 29' arnying theroller y22.. A pull rod 30' is rotatably disposed on the lever 26 at the point 30 and has, at its lower cnd, a longitudinal slot 31 which receives the pin 32, fixed on lthe setting lever 23. At its lower end, the

e A 4 y2,983,240* "r the needle transversely of against the flange -13 of the camshaft 5,

Yfor the lateral position of the needle further possesses, on

pin 46 (Figure 1) which bears under the action ofthe spring 49 against the cam surface 48 (Figures 6 and 13) of the hand lever 47v which -an be'turned about the axis of the camshaft.

The control unit further possesses an arrangement which allows the cams 8 and 9 to be'uncoupled from the camshaft automaticallyand coupled thereto manually. This is effected by axial shifting of the clutch ybushing 10 on thecamshaftS. Ij v "In order toensure reliable driving ofthe clutch bushing 10 in the engaged condition, this bushing has in its interior apermanent magnet' 504 which draws it rmly The cam 9 its under side, two cam crests 5-1 and 52'; (Figure 14 and 14a) which, during turning of the cam 9, run on to corresponding coacting cam crests 53 and 54 on the clutch disc 55, which is arranged tobe rotatable about the axis of the camshaft 5, andv thereby raise the clutchbushing 10 until the teethV 11 have come out of engagement with the tooth" gaps 12 in the flange 13, whereupon the cams 8- andf9 thus come tok rest. ln order lto'avoid jamming on shifting'of the clutch bus'hing'jl, the clutch ring or the clutch discf55 has two domed 'cam crests 56,' 56 which are displaced by 907 in relation to the crests 54 and 53v and which permit of adjustment of the clutch ring 55 to suit thedilerencesin height, resulting from production causes, between the crests 51 to 54. v t j Y To eiect coupling, the operator Ylresses on the clutch lever'60 against thecactionof the spring 60 `(Figure.15). The clutch ring 575,' pivotally :connected v1 0-'the clutch lever 60 `is thereby rocked.'Y VvDue' vto thefslope ofA the crests 51454, the cams Stand '9 partake inthis rocking steel ,band 21 likewise has a longitudinal slot 33 which receives the pin 3-2 and is biased by spring 33 against guide roller 22. If the lever 26 is situated in the position 34 shown in Figure 2 the guide roller 2.2 is raised and the steel bandl is tensioned under the action of the spring 25 andthe lever 16 bears on Vthe cam 8. Y In Athis position 34, therefore, the material-feedris automatically controlled. If the lever 26 is moved to the-position 3S, the roller Z2 is lowered by means of the cam Z8. The automatic control of the material feed isv thereby rendered inoperative and the pin 3 2 is moved,

under the action of the spring 25, so Vfar downwardly that it comes tovbear at therend of the slot 31. In this posi-V the pivotjoint 39 and carries the slide surface 40 along which the connecting bar 41 can be displaced byl means of the lever 44. In accordance with Figure 1, the connect-v ing bar-,41 is connected at the left by means of the ballY joint 4 5 to the pendulous frame 4Z which, at the point 43 is; mounted in the head of the arm 1in pointed pins orY tieni-of thev needle byy hand,i the position lever :Zhas ;a

movement until the Vnoses 57 or 57 on the' cr'est`s, 51 a'nd 521 (Figures 14, 14a and 16)VVA bear against thev stop 59 (Figures 14a andlS) whichjis hired by screws to the sup-` port plate 6; 'Upon further rockin-g of the clutch ring 55, the crests 53 and 54vslidel past under the'noses 57 and 57'-, whereupon they release the crests 51 and 572 so that the clutch bushing 10 Acan slide down again and return to the coupling position in which it engages With the ange 1,3 by means of the teeth ,11. Should satisfactory engagement not =be brought 4about by the weight of the coupling bushing`10 itself, theY inclined surfaces 58 and SSofthe clutch ringjSS encounter correspondingly inclined surfacesV of' the noses"57 and 57' and, upon the further rocking, will positively press the 'clutch vbushing 10 downwardly and thereby Ycouple it with the'ange 13. After release Vof the. `handle160,the clutch rin-g 155 4and the handle 60 will return to their original positions under the action of the spring 6 0". I l

l:For the automatic sewing ofjbutton holes, thecam 7 f orthe lateral 'dellectionof the needle has'cam surfaces y' whichproduce 'zig-zag stitches. "'I'he 9,for thelateralvposition of the' needle has; cam surfaceswhich Aare' soshaped that, bymovements superimposed upon the zig' zag movements, they produce terminall crossstitches (the transverse seamsclosing the endsof the buttonhole) and create ther-ight' "and, left borders by changing the ylateral positnqf thefnfe'dll For purpose', the rams Tand 9 ,"e'so (fo-ordinated that, during thejsewing of tlxglockiig' seams, the-needle desastreus and 'the 'movement determiningthemeanneedlQPOSitionstakelplace'at the sameftime'and to the'nsa'meV side and that, fonfexample, the Afirst button'fholestitch .commences with ra,ck1etlection of the needle to theleft and with the left-handfposition of,the needleandthat the button hole is completed with the needle in the left-handposition.

The cam 8 Vfor inuencing the feed g of the material carrieslfcamf surfaces which are shaped so that rthey ma terialris conveyed rearwardly. The position of the crests 51 .and 52 inrelationV to the cams 8 and 9 on the onehand pintlesq- For the purpose of controlling the lateral posi- "I i andtofthe crests 5 3 and 54 on ,theother handis made such thatgthe canisf andy-910mm ,withthesamshaft only while producing terminal cross stitches for the but ton-hole. Y Y

For the automatic sewing of button holes, the. le`ver 26 (Figure 2')v is brought into the position 34 and the lever 47 (Figure 6) isset to the extreme right-handposition, so that the' pin 46 (Figure 1 does not bean against the cam surface 48 (Figure 6), -but the lever 3 8 is Iin contact with the cam 9. The lever 44 (Figure 6) is set soV that thelpoint 41a of the connecting bar 41 is situated approximately at the middle of` the length of theslide surface 40 (Figure 9). This position is markedl by a notch 44 in the arm of the machine. The cams 8 and9 are coupled to the camshaft 5 and thus to cam 7 by operating the handle V60arid the machine is then ready forV the automatic sewing of button holes.` I Upon the commencement of sewing, the machine sews the iirst terminal ystitches of the button. hole. The material is conveyed rearwardly and, 'after vabout one quarter to one half of a revolution of the camshaft, the locking or terminal stitches arecompleted.` Thereupon the cam 9 impartsto the needle a right-hand position with which the right-handjborder of the button hole is sewn. The crests 5 1 and 52 run on to the crests 53 and 54 and, after a halfA revolution, uncouple the cams 8 and 9 'from the shaft. The right-hand position of the needle and the rearward conveyance of the material are thus lmaintained, so that the machine continues toV sew the l,righthand border of the button hole, unaffected bythe coupling, until the handle 60 is actuated thereby coupling the cams 8 and 9 again to the camshaft 5. Upon the comL mencement of the second half revolution of the cam V8,

the conveyance of the material is changed to forward feed while upon the commencementY of the secondhalf revolution of the cam 9 the latter first: of' all produces adjusts the needle to the ileftzi, The' machine tlen sews the second border of the button hole:v A fter the completion of the second half revolution ofthe cams 8 and f?, the teeth 11 of the clutch bushing 10 and thetoothgaps 12 in the flange 13 of the camshaft 5 are broughtfout Yof engagement by the crests51254; The cams Sand 9 tlins remainA stationaryV after the-second half revolution, withoutrthe position of thev needle andthe direction and airiountA of' the material feed being changedf'fjConsequently the machine-continues, unaffected by the" coupling, to sew the second .border of the' button hole until themachineis stopped. v AThe' cams, suchfr'eiaxiple" as 7, '8, 9, may also be designed as cams closed on themselves. The number of clutch teeth 11 on the clutch bushing 10 corresponds to the number of crests of the cam 7 for the lateral deflections of the needle if this cam is designed as a zigzag cam. Y

Instead of the cam discs such as 8, 9, the clutch bushing may also carry a cam band. By this means it is possible also to produce eyelet-holes automatically with the arrangement described. In this case, the cam crests 51 and 52 would be situated on the cam band.

Since, upon the completion ofthe button-hole seam, the disengaged cams 8, 9 assume a position such that both the lever 38 and `also the Vlever 16 are located on the smallest cam-surface circle, itis possible to continue to work with the machine without changing the cams or other manipulations as with any other zig-zag machine or, however, to produce a further button-hole by operating the hand lever 60.

l. VIn a zig-zag sewing machine'of the type having an arm shaft, a Vneedle bar, a needle bar oscillator and a connecting bar pivotally4 connected at one end to s aid oscillator,;needle bar oscillating means, and stitch position setting means including 'rst and second camY follower means, respectively, adapted to transfer cam controlled movements to the other Vend of said connecting means, the second said cam beingoperatively connected to said connecting bar by way of said second caml follower kmeans to impart ypositioning movements thereto, and the third said being operatively engagedby said thirdfcani follower'meaniand coupling means interposed between said camshaft and saidsecond and thirdcams including vactuating'. means operative toestablish the coupling between said cam shaft and said second and third cams and automaticallyQope'ative in two positions of rotationof'saidpam shaft and said c ams to disengage said coupling means.

2. In. a 21g-zag sewing machine of the type having an arm shaft', a needle bar, a needle bar oscillator and a connecting bar pivotally connected at, one end to said oscillator, needlebar oscill'atingmeans, and stitch position setting means including first and second cam f ollower means, respectively, vadapted to transfer cam controlled movementsY to the other end ofl said connecting bar, andlstep/,controlmeans-'adapted to change the length and direction o ffthe. material feedy stepsof the machine and including third'cam follower means, guiding mechanismcornprisingthree cams operatively supported on a shaftjhaving driving engagement with said arm shaft,.one said cambeing -xedly connected to said cam shaftand Vbeing '.adaptedto impart oscillating impulses toV saifdconnecting bar byway of said rst cam follower means, the second said cam being operatively connected to said connecting bar by way of said second .cam followen lmeans .to impart positioning movements thereto, andthe third said cam being operatively engagedV by said thirdcamfollower means, and coupling means interposed betweensaid cam shaft and said second and third cams including actuating means operative to establish the coupling betweensaid cam shaft andisaid secondand third` cams and automatically operative-in two positions of rotationof said camshaft and said cams to disengage said copling'means, said second andthirdfcamsbeing connected t9 one another and movable `o`n said cam shaft, said shaft liavi 1`1fg fa1 Bangey portion presenting toth gaps? disald.gsedoarianrpfesemingiwah .adaptado ngagesaidigaps Y 'l 3.Y In azig-zag sewing machine of the type having an armshaft, a needle bar, a needle vbar oscillator and a connecting bar pivotally connected at one end to Vsaid oscillator, needle bar oscillating means, and stitch'position setting means including first and second cam foland including third cam follower means, guiding mechanism comprising three cams operatively supported on a cam shaft having driving engagement with ,said arm shaft, one said cam being xedly connected to said cam shaft and being adaptedto impart oscillating impulses to said connecting bar by wayof said first cam follower means, the second said cam being operatively connected to said connecting bar by way of said second cam folt lower means Vto impart positioning movements thereto,

1 and the third said cam being operatively engaged by "said third cam follower means, andv coupling means interposed between said cam shaft -and said second and 4third cams including actuating means operative to establish the coupling between said cam shaft and said second and third cams and Vautomatically operative in two positionsrof rotation of said cam shaft and said cams to disengage said Yai'i'i'rsli'aft, a needle bar, a needle bar oscillator and a conneeting barlpivotally connected at one end to said oscilletton/needlebaroscillating means, and stitch position set# ting'meansincluding first and second cam followermeans, Y

respectively, adapted'tor-V transfer cam controlled move;

ments to the other VendY of said connecting'bar; and step control means 'adapted to changethelength and direction ofthe material feed steps of the` machine and including third camgfollower means,l guiding mechanism' comprisf Ving three Ycams operatively supported on" a cam shaft having driving engagement with said arm shaft, one said cam being xedly connected to said cam'shaftv'and bein-g adapted to impart oscillating impulses to said Aconnecting ingrbar by way of said first cam'follower means, the second said cam being operatively connected to said connecting ba'r by way of said second fcam follower meansto impart positioning movements thereto, and the third said cam being operatively engaged by saidthird cam follower means, and coupling means interposed between said cam shaft-and's'aid second and third cams includingactuating meansfoperative to establish the coupling between said Ycam'fshaft andl said second and thirdY cams Vand auto*- matic'ally operative intwo positions of rtationof said cam shaft and said cams to vdisengage saidy coupling means, and-supporting means disposedr above said arm shaft' supporting'said cam follower means and said cam shaftj said first and second cam followermeans compn'singrst and second levers, respectively, said levers having a pivot connection proximate adjacent ends thereof and said first lever being pivotally mounted at its other endcon said supporting means, saidrsecondlever*being yadapted to follow 'the' movements of saidgiirs'tlever by way of said pivot connection and having a-sliding surface,"'and a settingiarm having `ahmdle andhaving slidinglengagement withgsaid Aconnetiii'g bai said other end ofsaid con# fleeting?bar ,sliding engagement` with 'fand being movable Valong; said sliding surfaelin response?l tov movesadisme l '8 lator, needle bar oscillating'means, vand stitch position set-y ting means including `nrst and seconde-am follower means, respectively, adapted 'to transfer cam controlled movements;` to Vtheother'endl of'said connecting bar, and step control means adapted tochange'the length and direction of lthe n'r'aterialfeedr steps-of the machine and including third` carne follower means, guiding mechanism comprisf ing three-cams operativelysupported on a cam shaft having driving engagement Withlsaid arm shaft, one said cam being lixedly connectedv to'said Ycam. shaft and being adapted to impart oscillatingimpulses to said connecting bar by way ofsaidV iirst cam follower means, theV second said cam being operatively connected to said connecting bar by way of said second Ycam `followerV meanstd impartpositioning movements thereto, rand the said cam being operatively V'engaged by s aid third carnfollowe'r means, and coupling means interposedbetween said shaft andsaidsecondand third cams including actuating means operative to vestablish'the coupling between nsaid cam shaft and said second Vand Vthirdearns yand lauto'- matically operativepin'two positions of rotation of said cam shaftand said cams to disengage said coupling means, said actuating means including a, cam disk Vjournalled around said cam shaft and having a rst carnconfo'rmation for disengaging said coupling means and said' second l References Cited in the tile ofvthisi. patent L UNITED STATESV PATENTS" Rader f; Dec. 21,1926

1,675,508 Muller 1 a July 3 ,11928k 2,378,534 Beyer- .Tune 179,A 1945 v2,653,557 Casas-Robert et |al V .V Sept. 29, v19753 2,684,649 Y Scarpa r o July 27, 1954 2,764,895 Bono r o r. AOct.; 2, 1,956

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