US988050A - Hemstitching-machine. - Google Patents

Description

H. UNGER.

HEMSTITCHING' MACHINE.

APPLICATION TILED OCT. 30, 13109. 988,Q5() Patented M31228, 1911.

2 SHEETSSHEIZT Fig.1.

H. UNGBR.

HEMSTITGITING MgcmRE, APPLICATION Il-LED OCT. 30,1905.

988,050. Patented M11228, 1911.

2 SHEETS-SHEET S!- UNITED STATES PATENT OFFICE. I

nob enema, or BERLIN, GERMANY, assrenon T LINTZ & ECKHARDT, or BERLIN, GERMANY.

. HEMSTITCHING-IVIACHINE.

Specification of Letters l ateut. Patented ltlar. 28, 1911 Application filedflctober 30, 1909. Serial No. 525,473.

it auwhom-e m concern} I Bei't knowntha't I, HUGO .UNGER, a sub- 'ect of the King OLSaXOny, residing at Berin, German have invented certain new and useful Improvements in Hemstitching- Machines; and I-do hereby declare the following to bee. full, elear, and exact description of the invention, such as will enable other skilled in the art to which it appertains to was and use the same", reference ,heing-"hadto?the acconipanying drawings, and toletters ot: figures of reference'marked thereon, which form a part of this specification.- 1 T My inveiitionrelates to hemstitch sewing machines ttndniore particularly to the needle bar mounting mechanism and means forspreadin'g the needles during the hemstitching' 0 ration, as will be hereinafter fully descri ed and claimed."

Referring to thedrawmgs, in which like parts are similarly designated, Figure 1 is an"el evation of-so much of the hemstitch sewing machine as is necessary for an un deretanding otmy invention and shows the needles spread. "Fig. "2 is a similar view showing needles in closed position.- Fig. 3 is a side view partly insection. Fig. 4 is a section on the inlet-4' of Fig.2 and Fig.

5 is asection'on the Knee-5 of Fig. 2.-

Mounted on the frame a of the machine is a bracket (1 in which is mounted a short counter shaft 6 carrying a cam wheel e and trg'ear wheel (i gearin with a similar gear B on the drivin shai t a of the machine.

The relation of tie diameters of wheel (1 to wheel a in the accompanying drawing is 3 7 to 1, however any other proportion may be usedto produce a correspondingly altered dostitoh. ,The cam wheel 0 1s rovided with a.

" cam groove 0' whichis so ormed that the.

needles take up their innermost posit-ion dur; an two stitches and move a part for each Qtlurd stitch. In a known manner the cam 15 may be so formed that the needles slightlymove apart during the two inner stitches for thepurpose of enlargiugthe stitch hole .in the material. .Pivoted on the frame of the machinelat e'ish' a bell crank. lever e, who u ri t arm as a in e en aging .the g i'od v'e q" in the cam wheel The othefarm'ot the said lever is connected to the arm f' of a. double armed lever -f, f

.-piv() ted-at f, this connection being efiected .cured t0 the'cn'd of the tube It.

by a bolt 1 which. guided in a slot f in the lever arm f, moves in a groove 0 in the horizontal arm. of the lever and may be fixed to the arm f by means of a nut 9'. By adjusting the bolt ,g from the point 6' toward the point f. the throw of the lever f'f can be varied from zero to a maximum. A vertically reciprocablc operating slide 2' on the machine frame may be actuated directly -by the lever f f It is however, moretadvau tageous to connect the lever f f with 'the slide :5 by means of an adjustable member, such as the lever h which is'also pivoted at. f and by means of a screw it passing" through a sloth pivot'ally connected with said slide. The lever 71. is'provided with a slot 71 through Whichfpzisses an adjustable screw h capableof clamping the lever h in angular relation to the lever f, 1. The arcuate slot It and the adjusting screw h permit the adjustment of the lever h with 75 respect to the lever f f to adjust the end positions-of the slide 5 without affecting the extent of movement of the slide 2'. On the head of the machine is revolubly mounted a tube is, which is actuated from the crank by means of the beveled wheels-Z: In and within which the needle bars I are freely suspended at Z from a collar Z said collar being engaged by a fork 1 of a reciprocable slide l operated ironic shaft 0, of the machine by means of an eccentric a which is connected to apivot l fixed on the slide Z k is a. spool holder.

It willbe noted that the needle bars'l are suspended at their upper ends so that they are free to swing under the influence of a needle spreading mechanism. The lower end of each needle. bar passes through a sleeve m, and each sleeve is on a slide m that is mounted on a supporting block In se- Each slide has a. slot 122?, said slots being inclined to each other-as shown.. On the lower end'of I the tube is isa collar 11. engaged by the fork i of the slide i'an'd depending from this collar on each side of the tube In are brackets. 11. in'whichare screws or act-uatin pins 12%.- taking-into the slots m. e colar n is slidahl'e but not rotatable on the tube In and consequently when it is depressed relatively to this tube the ins 11 taking into the slots forces the slides m together. The piercer 0 fixed in a known manner between the needles Z hastwo lateral grooves in its sides into which the needles Z, secured at the end of the needle bars 1, may rest when in their inward position, Fig. 2. The presser foot 1) is also provided with two he es Figs.

'1 and 2, through which the decorating thread is passed, and which, during the movement of the fabric by reason; of the pier'cer 0 passing through the goods, is held -10 uniformly stretch the fabric in all direcelevated during the piercing operation in the customar manner; v

-r is a fabric stretcher containing as usual a rubber ring 1" having beveled edges so as tions and at the same time prevent the fabric from wrinkling during the h emstitchlllg operat1on.-

The operation of the device is as follows:

' The spreading of the needles takes place by 'rea'son' of the cam wheel 0 operating during two stitches of the needles Z so as to actuate the slldes m so far inward 1'. toward the iuercer a, Fig. 2, that they only have a small 'pi'eading movement for the" purpose of.

fzpening the hole made in the fabric. Be-

fore the third stitch the collar 11. is' raised by the fork and slide a i and the lever mechanismh f f e so that the pins n carried in the depending lugs 71' of the collar nwill be moved upward and in so doing move the slide 172 outward to the req nired extent, (Fig. 1). The extent of spreading of the needles Z is controlled by the adjustment ofthe bolt g to-and from the .pivot e as above described. By adjusting the lever h with respect to the lever arm f, the collar n and the slide'z' are varied in height whereupon the slides m are either spread or brought together and the needle ba-rs correspondingly moved. By this means the distances between the inner and the outer row of stitches is altered. By altering the relative proportionof the gearing a dthe number of the inner and the outer stitches can be altered,

so that for example for .each two inner stitches 'two ormore outer stitches will be made. I

Claims. a 1. In a hemstitching .machine, .the combination with the frame and the driving shaft, of a gear wheel on the shaft, a bracket mounted on the frame, a counter shaft mounted in-the bracket, a cam and a gear wheel that meshes with the aforesaid'gear wheel on the counter shaft, a bell crank lever pivoted to the frame one arm of which is actuated by the cam and the othcrarm of which has a slot, a composite lever coinprising a slotted section, an adjusting screw lever, a second section and a third section.

in the slots of said section and, hellcrank having two slots, the second and third sec.- tions secured to the first section, an ad usting screw passin through one of the-slots" in the third section into the second section, a rec'iproeable slide having a fork, and a screw passing through the second slot into the s1ide,-a tubemounted rotatably inthe frame, a collar slidable, but not rotatable on the tube and engaged by the fork of said slide, slides mounted to move transversely on the tube, each having an inclined slot and a sleeve, two lugs depending from the collar, a pin in each 'lug taking into a ,slot in a slide, a needle bar suspending collar, an actuating slide therefor, two needle bars independently and pivqtally connected to the needle bar collar, the lower end of;-'each needle bar g 2. In a hemstitchingmachine, the. combination witlrthe frameand the driving shaft, of a gear wheel-on the shaft, abracket mounted on the frame, a counter shaft passing through a sleeve on awheel that meshes with the aforesaid gear wheel on the counter-shaft, a bell crank lever pivoted tolthe frame one arm of which is actuated by the cam and the other-farm. of

which has a slot, a composite lever comprising a slotted sect-ion, an'adj usting screwfin the slots of said section and bell crank lever, a second section and a third sectionhaving. two slots, the second andthird'seetion s se cured-to the first section, an adjusting screw passing through one of the, slpts in the third .mounted in the bracket, a cam and a gear section into'the'second sect on, a =reciprocable slide having a fork, and "a. screw passing through the second slot into the slide, .a

needlebar passingthrough a. sleeve, pins carried by the second col a'r to en age the slots to actuate theslides and a lever'to actuate the slide. Q

. 4. In a hemstitehing sewing machine havin a driving shaft the comb nation with a co lar, and rigid rciprocable needle bars" pivoted thereto at their upper ends; of slides through which the bars "pass, mechanismto' actuate the slides from the shaft, including" read of the needle means to adjust the. s bars'and means to a outer limits of the bars.

5. In a heinstitch sewin'g machine having a driving shaft the combination with re-.

'cipro'cable needle bars pivoted at their 'u' per ends, slides'through which said-nee eust the inner and-I bars pass each having a cam slot, means to engage the slots and mechanism to operate said means from the shaft includinga composite lever having means to ad ust the spread .of the bars and means to adjust their inner and outer limits.'

' 6. In a hemstitchin machine the combination with a main-s aft and laterally vivbratable needle bars; of a cam actuated from the main shaft, 9. bell-crank lever 0 erated by the earn, a two-part lever adjustab y connected to the bell-crank to vary the lateral vibration of the needle bars, means to adjust .one of the parts of the lever'with respect to the other to vary the distance between the rows of stitches and means to operatively connect said leverto the needle bars.

'7. In a hemstitching machine, the combination with pivoted needle bars; of guides for the lower ends of said bars, a collar reciprocablebut non-rotatable with respect to the needle bars, means carried by the collar to cooperate with and operate the guides, a

-. slide to actuate the collarand' a two-part adjustable lever to' actuate the slide and means to vary the angular relation of the two parts of the lever.

. 8. In a hemstitchin machine, the combination with a needle bar support and meaus'to reciprocate it; of needle bars pivotedat their upper ends -to the support, needle bar spreading devices including alever to adjust the distance between the needle bars to regulate the distance between the rows of stitches and a secondary lever to which the former lever is adjustably secured to vary the extent of lateral vibration of the needle bars.

9. In a hemstitching machine, a needle bar supporting 'collar, means to reciprocate the collar and in which said collar is rotatably mounted, needle barspivoted to the collar at their upper ends, guides for the lower ends of the bars, means/to adjust the distance apart of the guides, means to spread the needle bars, and means to rotate the needle bars about an axis common to them.

10. In a. hemstitching machine, a needle bar supporting collar, means to vertically reciprocate the collar and in which the collar is rotatably mounted, a tube, means to rotate it, a collar on the tube, guides on the lower ends of the tube in which the needle bars are guided and having inclined slots,

-means to actuate the second collar, pins carried thereby to enter the slots in the guides,

a slide to actuate the second collar, and

means to actuate theslide for actuating the I collar and guides, including means to adjust the' distance a art of the needle bar guides to vary the distance apart of the rows of stitches and means to adjust the spread of the guides from zero to a maximum to vary the extent of lateral vibration. y

In testimony that I claim the foregoing as my invention, I have signed my name in presence of two subscribing witnesses.

. HUGO UNGER.

\Vitnesses JOHANNES .HEIN, HENRY HASPER.

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