US1792722A - Sewing machine - Google Patents

Description

1931. A. J. WOHLPART 3 SEWING MACHINE Filed June 19, 1926 2 Sheets-Sheet 1 INVENTOR ATTORNEY Feb. 17, .1931. A, J, WOHLPART 1,792,722

SEWING MACHINE Filed June 19, 1926 2 Sheets-Sheet 2 lNVENTOR ATTORNEY Patented Feb. I 17, 1931 UNITED-STATES PAT AUGUST JOHN WOHLPART, or NEW YORK, N.IY.. ASSIGNOR T L. BULASKY, rNooR- IPORA'IEID, or NEW YQRK, N. Y.

V snwI G MACHINE imitatio filed June 19,

This invention relates to improvements in sewing,machinesand has for one of its objects to eflect, by a novel combination of parts,

a readily adjustable device for producing stitching from various ranges or widths of zigzags, to simple straight stitching.

With the present construction, my machine may sew stitches'continuously in a straight line or ordinary sewing, or it may produce 10 zigzag stitches of different width of throw up to, three eighths ofaninch, or more, if

necessary. a I

With the above objects, and certain other objects also 'in view which will become apparent as the present description proceeds, my invention consists in the novel parts, and combinations of parts, all; as hereinafter will be more fully described and particularly pointed out in the claims. 4 29 Referring to the accompanying drawings forming a part of this specification in which like numerals designate like parts in all the views: r

Figure I is a side view ofa small sewing 'machine embodying my attachment for zigzag stitches of various width.

Figure II is the end view of this machine looking at it from the needle, feed mechanism, and stitching end. 7 I 1 Figure III is a detail View looking down upon the mechanism specific to the zigzag driving mechanism. f 1

With further reference to Figure -I,'10 is a stationary frame casting of usual sewing machine design integral with bed plate 11 adapted to support and guide, as well'as-to provide pivots, bearings, etc, etc. for' the working parts of the machine. The bed plate 11 is adapted to mounting upon a table or other suitable support. I

The main shaft 12 of the machine is mounted in suitable bearings in the frame, and isprovided as usual, with a driving pulley or belt wheel 13, shown broken away, and an eccentric 14 which through the-apltman 15, lever 18, pivoted at 17, shown broken away, and the link-member 19, imparts to the needle bar its vertical reciprocations. r

The needle bar 20 is arranged to carry the 1926. Serial No. 117,070.

ENT OFFICE the casting 10 as indicated bythe positions of the slot-way 23' which is cut in the frame casting 22. A screw 24 enters into and engages threads in the stationary frame 10, and the oscillating motion is produced by the lever 25 adjustably and yieldingly connected to the frame 22 by the screw pivot 26 working in a slot provided therefor in said frame. The lever 25 is hinged, or pivoted, at 27 to a long ribbed lever 28, and which is again 'lever 28 moves to the left and consequently also moves the pivot 27 to the left, and this in turn moves the lever 25 to the left, which in turn moves the frame22 to theleft, and since the frame 22'is pivoted to the casting 10, it swings the point of the needle 21 to the right. The lower end of the lever 28 has associated therewith the adjustably slotted stud 36, shown in dotted lines, for drivingly connecting the link 48, also shown in dotted lines, with said lever, and said link is adjustably secured by the stud 52 in the frame or yoke 40. This frame or yoke 40 is in turn driven to the right and to the left,.alternately, bythe stud 39 of the link 37 and the stud 38 in the radial slot-way 50, of the complex quadrant lever 49, which along with the lever 28 is also pivoted and free to swing about the common large stud 29. This complex quadrant lever 49 hasa roller P111011 its reverse side, shown in dotted lines at 30, and the said roller pin 30 imparts a right and left, back and forth swinging movementto the complexquadrant lever 49, as the roller pin is it self driven back and forth, right and left, in its engagement with the cam slot of the roller 32. The roller 32 is driven by the large gear 33 which it engages, and the large gear 33 is in turn driven by the smaller gear 35 and the main shaft 12. The complex quadrant lever 49 withits curved radial slotway 50 is calibrated off into the divisions 51.

hen the link 37 is in the position shown inthe drawing, with thestud or wrist pin 38 at the extreme upper end of the radial slotway 50, there is no back and forth motion imparted to the link 37, when the complex radial lever 49 moves about thepivot29 as maybe seen, and consequentlythere is no motion imparted to the frame or yoke l0, becauseof the close proXimity'of-the studor'wrist pin 38 to the largepivot stud 29. The minimum motion of the quadrant slotway'is, therefore,

at its upperend, and the maa rimumqn'otion of the-said quadrant slotway 1S2Li-tl1 lower end, and the intermediary motions are indicated by the calibrateddivisions 51, already referred to, To more easily change theposition P of the --li nk; 37, the stud 38 may conveniently'be provided with aknnrled head or wings for-ready adjustment as desired while the machine 1s1noperat1on,as will heapparent.

Theframeor yoke 40, isattachedat its lefth'ano end-tothe bar 41 which is adapted'to slide back and forth through therguide bearings 42 and 4a.

The bar hasattached fast to itpthe member tand"throughthe extension finger 44' runningin-a slotinthe member 45 it slides the said member 45to the right and to-the left on themainshaft 12, when driven bythe cordance with previous patent disclosuresin this art, and, therefore, itisnotdeemed essential to illustrate-it in moredetail here.

V VVith further reference to Figure II, 20'is the reciprocating needle bar, 18 the end of the driving lever, 19 the connecting link between lever and needle bar 20, 22the oscillating frame guiding the needlebar 20, 10 the stationary frame of themachine, 5'5the-pivot between the moving frame 22:and the stationary frame casting 10. 29 is the large common stud for the lever 28 and thecomplex quadrantlever 49. 38-istheentl of the stud whichslides down throughthe slotof the complex quadrant lever 49. 37 is theconnecting link-and 39 the lowerstudadapted to drive the-frame or yoke 40. 48' showsthe end of the driving link connected to the lower end 28 of the lever 28. 11 shows the bed plate, 12 is the main shaft of the machine, and 47 is the looper on the said main shaft- 12 together with the small gear 35 which meshes with and drivesthe large'gear 33 on the cam 32 which engages-theroller stud 30.

With further reference to Figure III these same numbers and parts are shown looking =down "from above -'the respective parts -m-ay be identified by like numbers.

From an inspection and analysis of these mechanisms it may now be appreciated that by the single movement of the stud 38 along the radial and calibrated slot-way 50 of the cnmplex quadrant lever 49, I simultaneously effect adjustment of both'sewingneedle and looper.

It will also'be appreciated from an inspection and analysis of these mechanisms that r the machinewill sew straight or conventional stitches when the mechanism is set in theposition shown, and furthermore, while themachine-is in operation it'is possible to make the change from straight or conventional stitchingto zigzag stitchlng.

Whereas I have shown one design of a mechanism for simultaneously controlling the lateral oscillations of needle bar and looper respectivelygI wish it to be understood that I do not confine myself to narrow or specific details, but ratherto the broad invention of simultaneous needleb'ar and looper control and adjustmentthrough the agency of a conveniently moved and simple lever, or its-equivalent.

Having described my invention 1 claim 1. A sewing machine adapted to makezigfzaig stitches, comprising a'needle bar,a'lever for oscillating the same, a looper, single means commonly pivoted with saidlever for controlling the increase or decrease in the lateral movements of'the said needle bar and looper, and driving connections between said means said lever and said looper.

2. A sewingmachine adaptedto make zigzag stltches, comprising a synchronized needlebar and looper, a'lever for oscillating the former, means commonlypivoted with sait lever for simultaneouslycontrolling the increase or decrease in'the lateral oscillatory movement of the said needle bar andlooper,

-a*m.ain driving shaft, and driving connections between said shaft said lever and said looper.

3. A sewing machine adapted'tomake zigzagstitchescomprising a needle bar, a lever for oscillating'thesame, a looper, andm'eans commonly: pivoted with 'said lever for predeterminedly and graduatingly' controlling the lengths of the zig-zag stitches.

4.1L sewing machine adapted to make zigzag'stitches, comprising a needle bar and a looper, a needle bar reciprocating lever, a

-needle -baroscillating lever, a: reciprocating needle bar oscillating lever, and the said r eciprocating looper shaft respectively.

5. A sewing machine adapted to make straight conventional stitches, or zig-zag stitches of varying lengths at will, comprising a needle bar, a looper, a needle bar reciprocating lever, a needle bar oscillating lever, a reciprocating looper shaft, and a reciprocating looper shaft mechanism, a main shaft, a gear on said main shaft, a jack shaft, a gear on the said jackshaftengaging the gear on the main shaft, a cam with an eccentric slot-way on the jack shaft gear, a roller pin in the said eccentric slot-way and fixed to a lever commonly pivoted with said oscillating lever and provided with a radial slotway and a movable and adjustable link, and driving connections between said link and said oscillating lever, said link adapted to drive simultaneously the said needle bar oscillating lever, and the said reciprocating looper shaft mechanism.

6. A sewing machine adapted to make zigzag stitches of various lengths, comprising a needle bar and associated leverfor oscillating the same, a main drive shaft, a looper, and driving connections between said shaft said looper and said lever including means commonly pivoted with said lever for controlling the length of stitch desired.

7 A sewing machine adapted to make zigzag stitches of various lengths, comprising a needle bar and associated lever for oscillating the same, a main drive shaft, a looper, and driving connections between said shaft said looper and said lever including singly operated means comprising a second lever commonly pivoted with said first named lever and a link adjustably associated with said second lever, said means adapted to predeterminedly and variably control the movements of said needle bar and said looper.

8. A sewing machine adapted to make zigzag stitches of various lengths, comprising a synchronized needle bar and looper, a link for oscillating the needle bar, a lever for actuating said link, means commonly mounted with said lever for simultaneously controlling the increase or decrease in the degree of lateral oscillation of the said needle bar and looper respectively, and driving connections between said means, said lever and said looper.

Signed at New York city in the county of New York and State of New York, this 16th day of June, A. D. 1926. 7

AUGUST JOHN WOHLPART.

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