US1551996A - Looper head for buttonhole-sewing machines - Google Patents

Description

Sept 1, 1925. v 1,551,996

I M. MOCANN LQOPER HEAD FOR BUTTONHOLE SEWING MACHINES Filed May 31. 1922 Patented Sept. 1, 1925.

UNITED STATES PATENT OFFICE",

MICHAEL McCANN, on GLENMORRIS, LONG ISLAND, NEW YORK, ,Assrenon T0 FREn- ERIoK osAnn COMPANY, on NEW YoRK, N. Y.,A CORPORATIQN on nnw YoRK.

LOOPER HEAD FOR BUTTONHOLE-SEWING MACHINES.

Application filedMay 31, 1922. SeriatNo. 5642708.

To all whom it may concern: f 7

Be it known that I, MICHAEL MCOANN, a citizen of the United States of America, re-- siding in Glenmorris, Long Island, in the county of Queens and State of New York, have invented certain new and usefulImprovements in Looper Heads for Button hole Sewing Machines, of which the following is a true and exact description, reference being had to the accompanying drawings, which form a part thereof.

My invention is designed for use in connection with button hole sewing machines embodying two needles and two co-acting loopers. In such machines as heretofore constructed trouble has been met with owing to a tendency of the loops, during the recession of the needles and immediately before the entry of theloopers into the loops, to bulge out. into the paths of the wrongloopers and one object of my invention is to provide a simple and efficient device for pre venting this and guiding the loops, so to speak, in the paths of their proper loopers. Another source of trouble in such machines arises from the liability of the needles to be pulled 0r pushed to one side of their proper path of travel so that they will not cooperate accurately with the loopers, and another object of my invention is to provide in connection with the looper carrying head guides which will prevent harmful deflection of the needles from their proper paths of travel.

My invention consists first in a looper carrying head having two loopers and provided with a loop guiding plate extending between the loopers and so disposed with reference to the needles and the path travelled by the needles, that the plate will at the critical time when the loopers are entering the loops thrown off by the recession of the needles, guide the loops 1nto the paths of the loopers, and, secondly, my invention consists in so forming the looper carrying head as to form thereon guide abutments which will prevent the needles from deflection from their proper path and proper cooperative alignment with the loopers. I The nature of my invention will be best understood as described in connection with the drawings in which it is illustrated and in which Figure 1 is a view showing the needles and loopers in the relative positions they the position in which the needles are enternormally travelled by the needles occupy about the time when the needles are ing shown as equipped withmy new loop guiding plate and needle guidingabutments.

Figure 2 is a s1m1lar-v1ew-showing the in their lower position, the looperhead .be-

parts in the position they occupy after the needles-have moved a short distance upward and the loopers have moved forward into the loops thrown by the needles. V Figure 3 is a similar view showing the 1 needles fully retracted and the loopers in their most advanced position;

Figure 4 is a similar View of the parts in ing the loops left open by the'retraction of the loopers. V Figure .5 is a side elevation of the looper head and attached parts, and g Figure 6, a perspective view showing the.- loop guiding plate and the means bywhich. it is attached to the looper head as shoiivn in the other figures of the drawing a ,A is he needle bar to hi h. areattachedi the two needles indicated at Band B. C is the top plate of the machine in which is formed the opening G for the passage of the needles. D, the work holding plate and E the clamp for holding the work indicated at F. G, indicated in Figs. 1 to 4, is a fin ger which I have found it convenient to use in guiding the loops into position but it forms no part of my present invention. is the looper shaft to which is attached the looper head I which is clamped on the shaft by the screws indicated at I, I, and in which are secured the rods J, J, which rods are clamped in the head by set screws J and have formed on their ends the loopers indicated at J. The front of the looper head I is slotted as shown at I so as to leave room for the passage of the needles through this part of the head and provide abutting shoulders I I which will lie close to the paths and will prevent the needles from being deflected laterally from their proper paths during the periods when the needles extend into the slot I The edges of the abutments I should be rounded as shown at I '5 Fig. 5, indicates the bottom of slot I K is the loop guiding plate which, as shown, is formed on a plate K which rests on the top face of the looper head and is held in osi tion by the screws I. The proper s ape and disposition of the loop guiding plate K with reference to the loopers J and slot 1 is best shown in Fig. '5. L, L, indicate the two threads carried by the needles and at L, L, F ig. 2, Ihaveillustrated-the loops thrown oil by. the needles during their upward movement and at L L Fig. 4, I have illustrated the loops being-cast oil bythe loopers during their retracting movement.

In operation as the needles pass upwardfrom the position shown in Fig. 1 towards that shown in Fig. 2, loops, as indicated at L, are formed'by'the slackened threads and these-loops or bulges of the thread are liable to be'formed on both sides of the needles and may, unless prevented, extend into the paths of the wrong. loopers. In my construction, however, the'loop guiding plate K prevents the inward bulging of the thread and obviates any danger of thethread being engaged by the wrong looper. It will also be obvious that the plate K, as is clearly shown in Fig. 4, would prevent any inward bulging of the loops formed during the recession of-the loopers and obviate any danger of a 'loop' being engaged by the wrong. needle.

This, however, is not so important a function as that previously described as there is not apt to be much bulging of the threads at this point in the operation of the needles andloopers.

It-will also be obvious that as-the'needles move downward toengage thethread loops on 'theloopers'and asthe loopers move into the loops of the thread above the needle eyes, any deflection of a needle from its proper path is liable to result in the needle striking a looper or the looper striking a needle and this danger is avoidedv by the and shaped to extend between and well in front of and above the looper points.

2. A; looperhead for a button hole sewingmachine formed with abroad slot through which two needles work and the sides of which slot form needle guiding abutments to prevent the outward deflection of the needles into the path ofthe loopers, said head having two loopers secured toit with their points more closely spaced; than the distance between the walls of the slotand said head having also secured toit a loop separating plate locatedabove and midway between the walls of'the slot and formed to extend'between the loopers and welliin front of and above the looper points,

MICHAEL McCANN;

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