US703813A - Stitch-forming mechanism for sewing-machines. - Google Patents

Description

No. 7o3.a|3. Patntd my l, |902.

L. oNnEnnoNK. STITCH FOBMING MECHANISM FOR SEWING MACHINES.

(Application med nec. ai, 1897.)

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.,mmlmf attorney No. 703,8I3. x Patented luly I, |902.

L. ONDEBDDNK.

STITCH FORMING MEGHANISM FOI? SEWING MACHINES.

(Appicaeion med nec. s1, 1897.)

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LANSING ONDERDONK, OF BOSTON, MASSACHUSETTS, ASSIGNOR TO THE UNION SPECIAL SEWING MACHINE COMPANY, OF CHICAGO, ILLINOIS,

A CORPORATION OF ILLINOIS.

STITCH-mamme MECHANISM -FOR SEWINGMACHINES.

SPECIFICATIONforrnngpart of Letters Patent No. 703,813, dated July 1, 1902.

K Application filed December 31, 1897. Serial No. 665,136. (No model) To @ZZ whom, it' may concern:

Be it known that L, LANSING ONDERDONK, a citizen of the United States, residing at Boston, in the county of Suffolk, State of Massachusetts, have invented certain new and useful Improvements in.' Stitch-Forming Mechanism for SeWing-Machines,of Awhich the following is a description, reference being had to the accompanying drawings, and to the letters of reference marked thereon.

My invention relates to annimprovement in sewing-machines, and'part-icularly to sewingmachines of the chain-stitch type, in which an under-thread-carrying looper cooperates with the needle to form the stitch.

The object of the invention is to provide a spreading device for the under thread which seizes the latter or moves against it as the looper is beginning to recede from the needle-loop and as the needle is movingv down and forces the thread to one side, so that the needle will pass between the looper and the looper-thread-that is, into the triangle, two sides of which are formed by the thread itself from the looper-eye to and around the end of the spreader to the vpoint at which it is tied up with the needle-thread in the previous stitch, while the third side is formed by the looper itself, this arrangement reducing to a minimum the liability of skipping stitches.

The invention therefore consists in a socalled spreading device coperating with the needle and looper and in proper relation to their respective movements to force'the thread in s uch position that when the needle descends the thread will be in position to make the'stitch and properly be surrounded by the looper-thread; and, further, the invention consists in certain combinations and arrangements of -devices, as hereinafter referred toin the appended claims.

The inventionV is herein shown asapplied to a sewing-machine for quilting purposes, in which a reciprocating and oscillating bar driven by suitable connections from the main shaft is provided with a large number of thread-carrying loopers arranged with their longitudinal axes at an angle to the longitudinal axis of their supporting-bar, this arrangement having been found of value and of practical necessity in adapting a wellknown type of chain-stitch looper for use on a sewing-machine for quilting purposes.

The invention is illustrated in the accompanying drawings, in which- Figure lis a top plan View of so much ofa sewing-machine for quilting purposes as is necessary to an understanding of my invention. Figs. 2 to 6, inclusive, represent plan views showing the looper and spreader in different relative positions; and Fig. 7 is an end View of Fig. l, partially in section.

In the drawings, E represents a drivingshaft, which may or may not be the main shaft of the quilting-machine, and from this, by suitable connections to the looper rockershaft H, poweris applied for reciprocating and oscillating the looper-supporting bar h', which is attached to the looper rocker-shaft H.

J represents the loopers, and Figs. l, 2, 3, 4, and 5 represent the different positions of the loopers and loop-spreaders in forming the stitches.

K represents an upright shaft supported on the bracket A, while B is an operating-1ever to which the loop-spreading bar F, carrying the loop-spreaders Gr, is secured.

D and d are quarter bevel-gears, which operate the revolving upright shaft K. The loop-spreader bar F,in which the loop-spreaders are secured by set-screws, is secured to the levers Bin a manner that admits of accommodating itself'to the movements of said levers B at the point of connection b2. The revolving shaft E operates the upright shafts K, ,and consequently the head C, secured thereon, and to this head C are freely secured by studs o the leversB, and these levers B rock and slide on the fulcrumed stud a3, which is secured in an arm of the bracket a at a3, Aand thus by'a complete revolution of the shaft E an elliptic movementis given to the bar F and the loop-spreaders G.

Fig. 2 shows the position of the parts as the looper begins its backward movement. Fig. 3 shows the loop-spreader in a different position and released from the looper-thread looper. Fig. 4 shows the parts having moved farther back. Fig. 5 shows the position as the looper is moving forward, just entering the needleloop, and Fig. 6 represents the loop-spreader moving' forward preparatory to engaging with the looper-thread,the looper just beginning to move backward, this being the position of the parts shown in Fig. l.

While I have shown this invention as applied to a sewing-machine for quilting purposes, it will be understood that the same arrangement rnay be applied in connection with the driving-shaft of an ordinary sewing-Inachine using a small number of loopers and loop-spreaders.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. In a sewing-machine, a looper, a support therefor upon which the looper is arranged,

with its longitudinal axis diagonal to the di,- rection of length ofthe support with means for oscillating said support, a loop-spreader support, and a spreader arranged thereon with its longitudinal axis at an angle to the longitudinal axis of the looper and means for reciprocating said latter support both in the direction of the length of the spreader, and transversely thereto; substantially as described.

2. In a sewing-machine, a driving-shaft, a bar or frame, having a pivotal sliding connection with a xed part of the machine-fram e, a crank for sliding and oscillating said bar or frame on its pivot, and a spreader-support pivoted to said bar or frame a spreader thereon, and a looper and su-pport therefor, with means for operating it substantially as dedescribed.

In testimony whereof I affix my signature in presence of two witnesses.

LANSING ONDERDONK;

W'itnesses:

CHESTER MCNEIL, JAMES R. TROWBRIDGE.

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