US931352A - Looper mechanism for sewing-machines. - Google Patents

Description

P. E. VALOIS. LOOPER MECHANISM FOR SEWING MACHINES. APPLICATION FILED 0U1.28, 1907 RENEWED SEPT. 2 1908.

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UNITED s'rAr gs PATENT OFFICE.

FELIX EMILE VALOIS, OF HAVERHILL, MASSACHUSETTS.

LOOPER MECHANISM FOR, SEWING-MACHINES Specification of Letters Patent.

Patented Aug. 17, 1909.

Application filed October 28, 1907, Serial No. 399,638. Renewed September 2, 1908. Serial No. 451,365.

' used in sewing together the uppers and soles of boots and shoes. I

Ilhc object of the present invention is to produce a new and improved" loo'per mechanism for shoe sewing machines.

To the above ends the presentinvention consists of the improved looper mechanism tor sewing machines-which will now be described and claimed.

The present invention is illustrated in the acmanpanying drawings, in which Figure 1 shows in side elevation and partial section my improved looper mechanism.

F1 2 shows a top plan view.

imilar reference characters will be used throughout the specification and drawings to designate corresponding parts.

In the drawing 1 represents a standard extending upwardly from the base of the head of the machine, in which is mounted a shaft- 2, carrying a cam 3, the cam having a cam-path 4 and a. peripheral cam-path t. The looper (3 may be of the usual form having the usual thread eye 7. This looper is adjustably and detachably mounted in the split end, 8, of a rocking and sliding lever- 9,

it being held therein by means'of a set screw 1o. The lever t) at its rear end is provided with a slotted head ll mounted to slide upon a block 12 pivotally supported upon a stud '12-} mounted upon the head of the machine, it

being held on the stud 125 by means of a cap 14 and a screw 15. The lever 9 has imparted to it a to-and-t'ro rcciprocating motion by means ol a, link ll; pivoted at 17 to a stud l8 swivclcd in a bearing 19 carried by said lover. The rear end of the link 16 is pivotally connected at 20 to a swivelcd stud ll which is mounted in the lower end of one arm 22 ol' a bell crank lever tulcrlnncd at 23 to the frame of the machine, the other arnrll ol the bell crank lever carrying a cam roll 25 engaging the campath 4.

From the foregoing it will be observed that" the rotation of the cam 3 will by means of thecam roll 25 impart a rocking motion to the bell crank lever 24 and 22 which will, by means of the link 16 and the swiveled connections, imparta sliding movement to the looper'lever 9, this movement being ermitted by the slotted head 11 sliding a ong the pivoted block 12.

It is well known to those skilled in this art that the looper must have in addition to the longitudinal reciprocations, lateral reciproations, and for this purpose the lever 9 has anupwardly extending boss 26 carrying'a cam roll 27, which engages the peripheral -am groove 5 which, as the cam 3 revolves, will impart a rocking motion to the looper lever 9, this being secured by the rocking o the ,combined movements imparted to the loopei; lever 9 by the cam grooves 4 and 5 result'in impartmg to the looper the sub- 'stantially circular movement necessary to throw the thread leading from the looper about the shank of the needle, all in a manner well known to those skilled in this/art.

It is thought that the operation of myinvcntion will be sufficiently understood from the foregoing description of its construction. In conclusion I desire to say that in the drawing I have not sought to show anyof the parts of the shoe sewing machine with the exception of my \im'proved looper and the cam for ope 'atin'g it, and that in so far as said drawing discloses the supports for t the block 12 on the spindle or stud 13, and

the moving parts, such supports are intended to be merely diagrammatic and not to accurate-1y show any part of the head of the sewing machine, it being understood that the" head of the sewing machine is or may be of any of the usual and well known types.

I-laving described my invention I claim as new and desire to protect by Letters Patent. of the United States:-

1. l\ loopcrmechanism for shoe sewing machines comprising the looper lever carrying at its outer end a looper, said lever slotted atits rear end and mounted upon a pivoted block, a cam engaging the looper lever in advance of its pivotal point to inipart thereto lateral movements, a lever opcraled by said cam for, imparting to the loopcr longitudinal movements and a link AVZ-UIABLE COPY swiveled to said looper lever and the operating lever, substantially as described.

2. A looper mechanism for shoe sewing machines comprising the looper lever carrying at its outer end a looper and mounted by a pivotal sliding connection at its rear end a cam engaging the looper lever. in advance of the pivotal sliding connection to impart thereto lateral movements, a lever operated by said. cam for imparting to the FELIX EMILE VALQIS. Witnesses JJU. ST. ONGE, Q1 HEQKMAN.

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