US1599567A - Overseaming machine - Google Patents

Description

Sept. 14 1926;

w. M. INGRAM ovaasmume luwr'w FiledJune 1 1925 2 Sheets-Sheet 1 wow-m .lwuymm Sapt, 14 1926..

w. M. INGRAM OVERSEAMING momma Filed June 19, 1925 2 Sheets-Sheet 2 hatented Sept. 14, 1926.

e-irs-asmrss ares WALTER M. INGRAM, 013 SUDBROOK PARKpMARYLA-ND, ASSIGNOR, BY DIRECT AND .JIIESNE AS$IGNMENTS, TO THE-SANITARY TEA BAGGING COTVEFANY, OF BALTI- MORE, MARYLAND, 1A CORPORATION OF MARYLAND.

,ovERsEeMING MACHINE.

Application filed JunellS, 1925. Serial No. 38,236.

This invention relates to over-seaming machines and has for an object to provide an over-seaining machine especially adapted for operating upon coarse labric with cut edges from which extend short raveling threads and to provide means torlaying downthese extended threads to produce a smooth ovei sealn.

A iurther object of the invention .is to provide in an over-seaming sewing machine means whereby the stitch' is formed by'the needle a'nd'loop'er over an inclined spoon and caused to slide forward over theextreinity ofsaid spoon-by the tension of the "threadto laydo'wn the raveling threads in smooth serial relation.

A "further object of theinvention isto provide additional frictional tension. inthe thread take-up'for thepurpose of causing theistitch formed over'the'spoon to slide iorwarchas noted. 7

A further object or the invention is to provide an improved type ofzover-turning spoon and neans' for holding the edge' of the fabric within such spoonto form an o'verturned edge upon "which the forwardly sli dingstitch operates.

With these and other objects in view, the invention comprises certain novel parts, elements, units, combinations, constructions, ifi'iteracti'ons, mechanical movements and functions, together with mechanical ltunction al equivalents, thereot as will be hereinafter more fully described and claimed.

Figure 1 is va ersp ctive view of an oversearning sewing machine of a linown tyne with the improvement applied thereto.

Figure 2 is an enlarged perspective view of the needle, looper, take up and overseaining spoon. v

Figure 3 is a top plan View of the overseaniing spoon showing its relation to the needle, thelooper and the stitch. 1

Figure dis a top plan viewof the spoon structnre. re noved.

Figure 5 is a sectional View through the spoonas indicated by line of Figures.

Like charactersot reference indicate corresponding parts throughout the several viejvs. V V

Thepresent invention is applied to an ever-seaming sewing machine of a well knewn'type employing a curved need-1e A,

Figure 3 "The relation of this spoon to the feed is such that as the fabric, a fragment of which 1s represented at 13, is fed through theinachine, the edge is "brought into en,-

gagenient with the spoon and bythe curva- ,u: 1- l i. .Y

ture or thespoon represented n section at Hat Figure '5-is turned over above the top of the fabric.

Asex'plained in the object of. invention,

the machine is' intended to operate particularly with a fabric of coarse texture having raw cut edge from 'i'vhich' would'naturally V extend; short threads or ravelings, as indicated at 1 4, and these threads or ravelings,

lwliilett'irned overwith the edge, stand up in a more or less untidy manner,

The relation of the spoon 10 to the needle "A and thelooper B, is such that the es 'treine end of'said' spoon lies between the-path-of the needle and looper when coacting so tliat the stitch formed by the needle and looper is drawn over and rests upon the to'pof the spoon 10 adjacent to the'nose as illustrated ino re particularly at Figure 3.

The nose'15 oi the spoon 10 is curved and inclined, as shown more particularly at Figure 2, so that the tension 01 the thread forming the stitch and eiitending between the needle and the looper as illustrated at will cause the stitch to slide forwardly over tl'ienose 15 of the spoon and carry therewith the upstanding extended ends, let ofthe ciit fabric 13 laying these fahricsdown neatly into the seam formed by the successive stitches.

To insure the proper sliding action oi the stitch over the nose of the spoon, more than ordinary tension is required upon the needle thread 16. To this end the take-up 17, which in its mechanical movement and general torin is" the accepted typeot talze 'up,

is provided'with add tional tension means comprising the h'oles'lS and 19 which arein addition and supplemental to the regular thread opening 20 of the recognized type of take-up. The needle thread is threaded through this take-up as indicated at Figure 2 and also at Figure 1, or in such other manner as may be found necessary or desirable for supplementing and augmenting the tension upon the needle thread 16.

The take-up 17, as is well known in this type of machine, moves toward and away from the looper B following an arcuate path the resultant of centers of oscillation at F and G. This arcuate movement of the takeup 17 is somewhat analogous to the movement of the needle A but departs from synchronous movement sufficiently to exert tension upon the thread in proper timed relation to the co-action of the looper. So that th s take-up may exert the necessary tension upon the needle thread 16, a guide 17 is attached to the head of the machine through which the thread extends. From the tension H the needle thread, indicated at 16, passes about a pin 17" returning as 16 to the take-up. This arrangement of the pin and guide in combination with the take-up embodying the additional tension openings 18 and 19 provides means for exerting sufficient tension upon the needle to cause the stitch to slip over the nose 15 of the spoon as noted.

To properly holdthe edge of the fabric within the spoon while the stitch is being formed and the raveling threads being laid down by the sliding stitch, a finger 21 is positioned within the curvature of the spoon, the end of which extends adjacent to the nose 15 of the spoon, stopping sufficiently short thereof to enable it to be lifted to the position 21 as shown in dotted lines at Figure 3 when a new fabric is to be inserted into sewing position. To lift this finger from the operative to its raised position, it is mounted upon an arm 22 pivoted at 23. Vvh le it is the intent that this arm 22 shall be lifted by the same means which lifts the pressure foot to provide for the insertion of new fabric and means 24 provided for attachment of such liftinganeans, such lifting means is not included in the present disclosure and any means for lifting the finger 21 at any proper time is included in the present invention.

Also mounted upon the body of the machine is a shear 25 properly positioned to at times cut the thread, but the means for actuating this shear in proper timed relation to the other parts of the mechanism are not here shown and the shear is, therefore, not claimed as part of this invention.

The present invention is intended to operate in conjunction with a machine for bagging measured quantities of'commodity and simultaneously producing a bag for such commodity, which bag is made of coarsely introduced into the machine by the raising of the finger 21 and presser foot D and, when so introduced, the presser foot and finger are returned to operative position and the machine operates upon the fabric by ad vancing it through the medium of the feed in the usual manner. Asthe fabric. is advanced, the out ed 'e is propelled within the curvature of the spoon 10 to turn up the raw out edge over the finger 21 and in this condition is fed to the osition within the spoon between the needle and the looper B. The stitch is formed between the needle and the looper in the usual manner and the showing of threads between the needle and the looper as at Figure 3 is only meant to illustrate the position of the stitch and not the exact formation of the stitch which is immaterial to the present invention, the form of the stitch produced by this mechanism being already well known in the art. The spoon underlying the extended looper tends to form the stitch between the looper and the needle over and upon the top of the spoon and by reason of the tension upon the needle thread produced by the improved type of take-up 17 causes the stitch to slide down the inclined top surface of the spoon in advance of the forward feed of the work, thus advancing and carrying with it in its sliding action the upwardly extended cut ends of the raveling threads. This causes the raveling threads to be laid down in series under each stitch so that the successive stitches produce in relation to this raw cut edge a neat appearing and firmly connected over-seam.

What I claim to be new is:

1. In an over-seaming machine, the combination with a needle and looper of a spoon introduced between the the needle and looper in such position that the stitch formed by the needle and looper is formed upon the top of the spoon, said spoon being provided with an inclined extremity over which said stitch so formed slides in the direction of the feed of the work and means to hold the work within the curvature of the spoon.

2.'In an over-seaming machine, the combination with a needle and looper of a spoon underlying the advanced position of the looper and between the needle and the Withdrawn position of the looper said spoon eX- tending a limited distance in advance of the position of the stitch. formed upon the top of said spoon by the movement of the looper away from the needle and a Work holding member removably positioned Within the curvature of the spoon.

3. In an over-seaming machine, the con1- bination With a needle and looper, of a spoon underlying the advanced position of the looper said spoon being curved to form a channel upon the side adjacent the needle and extended in advance of the position of the looper, and a finger positioned Within the curvature of the spoon adapted to hold the advancing Work Within the curvature.

at. In an over-sean1ing machine, the combination with a needle and stitch looper or" a spoon underlying the advanced position oi the looper and between the needle and the retracted position of the looper, said spoon being curved to present its channeled side toward the needle and its advanced end in advance oi the path of movement of the looper, and a removable finger positioned thread, adapted to tauten the stitch to cause it to slide forwardly over the extremity of the spoon.

In testimony whereof I afliX my signature.

WALTER M. INGRAM.

Images