US908434A - Thread-controlling device for sewing-machines. - Google Patents

Description

'R. G. WOODWARD. THREAD CONTROLLING DEVICE FOR SEWING MACHINES.

APPLICATION II LED JULY 23, 1902. 908,434. 1

Patented Dec. 29, 1 908.

3 SHEETS-SHEET 1.

grweufoz Gamm Witness wihmooeo v v R. G. WOODWARD. THREAD CONTROLLING DEVICE FOR SEWING MACHINES.

. APPLICATION FILED JULY 23, 1902 908,434.

Patented Dec. .29, 1908.

3 SHEETS-SHEET 2.

& Mm

glwaul'oz R. G. WOODWARD.

THREAD GONTRO LLING DEVICE FOR SEWING MAGHINES.

APPLIOATION FILED JULY 23, 1902.

Patented Dec. 29

3 SHEETS-SHEET 3.

UNITED STA ns rarest? onnrcn.

RUSSEL WOODWARD, OF WAUKEGAN, ILLINOIS, ASSIGNOH TU lfh'IOli SITTCIAL SEWING MACHINE COMPANY,

OF CHICAGO, lLLINOIS, A UORPORAJION O1 ILLINOIS.

TEREAD-GONTRQLLING DEVICE Fflli SEWZNG-EACIHNES.

s ecifications!" Letters Patent.

Patented Dec. 29, 1908.

Application filed July 23, 1902. Serial No. 116,825.

'devices for controlling the thread upon a machine of the type known as the Union Special side wheel cylinder twin needle machine, for seam covering, which is illustrated in the patent granted L. Muther, E. Holland and myself, on the 12th day of May, 1897,-No. 583,414. These ma hines are used quite extensively upon knit goods for covering seams previously made by superposing the edges of two pieces of fabric and joining them by a line of straight-awav stitches, the fabrics being then spread out flat, and run through-a sewing machinewhich embodies two needles and an under thread-carrying loo er, the feed being arranged longitudinalli' of the bed plate, so that the scam made is covered, leaving practically no objectionable ridge, and prcsenting a highly finished and ornaiiiontal appearance Difiicultyhas bcencxpcrienccd in machines of this character used for covering seams on light weight ribbed goods, from the fact that when the feed takes place at a time when the threads are not slack, a ridge or cord will be raised between the lines I of needle puncture, which is, of course, oh-

jectionable in a gar-men The ob ect of the present invcntion is to provide such an arrangement of controllers for the upper thread that the feed will take place while the needle threads are slack, thus avoiding all strain and the tendency to make a ridge on the goods along the lines of the The invention comprises in a sewing machine having stitch-forming mechanism of substantially the character dcscrihcd] a thread controller, and an intermil-tcntlv acting nipping device for the thread, of a pull-off device acting on both the necdlc threads, this pull-o device being preferably composed of two pair s which permit its being lengthened or shortened to pull off the desired amount of needle thread, there being also provided on a stationary part of the machine frame a pull up which acts upon the thread of the needle nearest the point of initial movement of the looper, this pull up acting to cause the thread of the needle upon which it acts to be thrown out into the form of a loop, before the loop is formed on the other needle. so that the stitchesmay be taken up at the proper respective times.

ll'ith this general sta temcnt of the features of the invention, it will be understood that said invention consists in the matters hereinafter described and referred to in the appended claims.

The invention is illustrated in thc accompanying drawings, '71 wh.ich

Figure 1 is a front elevation of so much of a sewing machine of the type referred to, as is necessary to a complete understanding of the invention, the parts being shown in the position they occupy while all the threads are slack and the feed ista-king place Fig. 2

is a similar view, showing the pr ition of the parts when the needles have reached their lowest limit, and are about to recede to throw out the loops,-the nipper springs being closed and the pull off having drawn the thrca d f1 om the spools through the tensions, the pull up also acting to make the left hand needle thread substantially taut, so as to allow a loo to be thrown out before the right hand needle loop is thrown out; Fig. 3 is a top plan view, the parts being shown in the same relative position they occupy l Fig. l; and Fig. 4 is a perspective end vie of the parts illustrating the looper about in position to engage the left hand needle loop which has been thrown out ahead of the right hand needle loop by the action of the pull-u p. Fig. 5 is a perspective view of the intermittent nipping device.

- In these drawings, the usual operating parts of the machine are the same as illus trated in the patent above referred to, and need not be specifically mentioned, exce t to state that A represel'its the goose neckfll the needle lover, (I the needle bar arrying the two needles, E, F, G, the looper carrying the looper guard linger ii, I the nipping device which is constructed in a manner similar to that shown in an application filed by l). \V. Corey, June 14th, 1901, No. 61,291, and K, L, M, are ordinary guiding eyelets for the thread; N, with its eyelet 1" representing the i it) 7 portion of the usual Union Special thread imlh re d s ,and he threads are Slack becontroller connected with and operated by the presser guide bar. This intermittent .ip'ping device is formed of a metallic plate 70 attached to the gooseneck by set screw 7, and to the upper end of late h are secured two spring plates i, k, he d from lateral displacement by step pins Z, and normally separatedat their lower ends to allow the thread 10 to slip between them. The upper spring plate is formed'adjacent its lower end; with a raised is secure the plate it having at its upperend a lug or projection 0, adjustably secured by set screw 1), and in the downward movement of the needle bar, the projection b will engage the spring plate- 2' and force it into contact with plate'k, thus gripping the thread.

Upon the needle lever B is arranged the eyelet Q havin two openings for the passage of the needle threads, and a similar eyelet is arranged upon the upper end of the needle cportion m. 7 Upon the needle lever bar 0. Upon the upper lug on the head of I the machine is arranged a ull-up R which is arranged to act upon the eft hand needle thread. Between the nipping device and i .the tension upon the goose neck of the ma-' chine is fixed a plate or arm S having two 'eyelets 1, 2, and between these two eyelets 1,-2,

Works a pull-off finger T, upon the end of the arm U adjustably secured to the arm V,

I which at its lowerrend is attached to the nee-- dle lever extension. As the needle lever moves up and'down, therefore, the pull-oil finger T alternately engages and releases the thread passing between the eyelets 1 and 2, thus alternately pulling off thread from the spools through the tensions X, Y, and releasing the same.

Assuming thatthe needles have assed their extreme upward position, an have commenced to move down, the feed has about ceased its forward movement, the nipper springs are closed, and the pull-off finger actsto draw thread through the'tensions; When the needles have reached nearthe limit oftheir lower movement, the thread of the left hand needle is brought over the pull-up and in the further downward movement oi the needle some strain is put on said threadwhich lasts during a portion of the upward movement of the needle, so that when the loop is thrown out a comparatively short one is thrown out, and this takes place before the formed, so that by the time the looper reaches the left hand needle the loop is ready for it, the loops being-thrown out successively instead of simultaneously, because of thc action of the pull-up. preferably so adjusted that there is a little slack thread when the needles are at their lowest point. As the needles move out of the goods, and the feed begins to take place, the nipper springs release the threads, the

loop on the longer, or right hand needle is- The thread controller is tween the tensions, and the goods, so that the feed takes place without causing any strain u on the threads at all, and this prevents t e formation of the objectionable ridge above referred to. By this. machine seams can be "covered on the lightest weight goods with practically no tendency to make a ridge or cord up and at the sametime, the appearance on the under side, of theseam or inside of the garment is not affected at all, Having thus desdribedmy invention, what I claim as new, and desire to secure by Letters latent, is

,1. In a sewing machine for covering seams, includingavplurality of'needles and a cross stitchde'vice cooperating therewith to lock the needle threads, means for controlling the needle threads including a pull-off and de- 1 vices cooperating therewith whereby thread is-pulled off While the needles are descending and thethread is slack and free "fromstrain, While the feed is taking place thus allowing a free feed for the material; substantially asdescribe. "'90 2. A sewing machine including in cor'nbination a. needle means for" o erating the same, a tension evice, a threa nipping device intermediate said tension device and the needle and a pull off intermediate said thread nipping device and tension device, and means for operating'said pull-off and threadni ping device whereby thread is drawn throug said tension while the needle is descending and the needle thread is slack and free from strain'while the feed is operatin to feed the material; substantially as descri ed.

' 3 In a sewing machine, including a reciprocating needle, means for controlling the thread thereof, comprising suitable eyelets for guiding the thread, an intermittent nipping device suitable tensions, a pull-off be- \tween the nipping device and the tension and which acts to pull off thread while the needle is in the goods, and releases the thread while the feed is tak ng place, in combination with a pull-up acting u on the needle thread to take up the slack t ierein while the needle is moving down, to enable a loop to be quickly formed; substantially as described.

4. In a sewing machine comprising a pluralityof reciprocating needles means for con trolling. the threads thereof, comprising a pull-oil acting to pull -o ff' thread while the needles are in'the-goods and releasing the same while' the feed is taking place, and a pull-up acting upon one of the nedle'threads to cause it tothrow out it's loop in 'a-rlvance of the other substantially as described.

,ln testimony whereof I afiix my signature, in presenceof two Witnesses."

BUSSEL G. VVOODWARD;

Nitnesses:

CHESTER McNEIL, EMMA KERN.

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