US674614A - Looper mechanism for sewing-machines. - Google Patents

Description

No. 674,6!4. Patnted May 2|, l90l.

- E. MURPHY. I

LDOPER MECHANISM FOR SEWING MACHINES.

(Application fil ed Aug. 1. H900.) (No Model.) 2 Sheets-Sheet I.

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No. 674314. Patented May 2|, 19m.-

E. MURPHY.

LOOPER MECHANISM FOR SEWING MACHINES.

A lication filed Aug. 1, 1900.)

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' UNITED STATES EDWARD MURPHY, or NEW YORK, N. Y., ASSIGNOR, BY MEsNE AssI'eN- MENTs, To THE METROPOLITAN SEWING MACHINE coMPANY, or sAME PLACE AND eLovEEsvILLE, NEW YORK.

LOOPER MECHANISM FOR SEWING-MACHINES.

SPECIFICATION forming part of Letters Patent No. 674,614, dated May 21, 1901.

Application filed August 1, 1900. Serial No. 25,491. (No model.)

To all whom, it may concern.-

Be it known that LEDWARD MURPHY,a citizen of the United States, and a resident of New York city, borough of Manhattan, in the county of New York and State of New York, have invented a new and Improved Sewing- Machine, of which the following is a full, clear, and exact description.

My invention relates to certain improvements in sewing-machines; and it consists of improved mechanism by means of which the under needle or looper and the feed are operated, and comprises certain novel features which will be particularly pointed out in the claims. Reference is to be had to the accompanying drawings, forming a part of this specification, in which similar characters of reference indicate corresponding parts in all the figures.

Figure 1 is a side elevation of a machine, showing my improvements attached thereto. Fig. 2 is a plan View of the lower portion of the machine with the work-plate'removed. Fig. 3 is an elevation of the mechanism by which the feed-bar is given its horizontal movement. Fig. 4 is an elevation of the mechanism for giving the looper-arm its transverse movement; and Fig. 5 is a side elevation of the feed-bar, showing the means for giving it its vertical movement.

One of the principal objects of my invention is to improve the accessibility and ease of adjustment of the operating mechanism, so that changes in adjustment, whether to secure a more perfect action or to change the stitch, may be more quickly and easily accomplished.

The machine herein illustrated and to which my invention is shown as applied is of that class which has an upper needle I) and a lower needle or looper L, which passes alternately upon opposite sides of the lower needle. The mechanism for operating the upper needle may be of any desired or preferred form, as this particular mechanism forms no part of my present invention. The upper needle is herein shown as secured to the lower end of a reciprocating needle-bar B, and said needlebar is operated by means of a lever B, pivoted to the upper rear portion of the frame A and operated by means of an eccentric and connecting-rod from a shaft 0, which extends lengthwise beneath the work-plate.

The looper-arm I is pivoted at its rear end, or the end farthest from the side of the machine occupied by the operator,and at its'forward end has an upwardly-extending portion 1, to the upper end of. which is secured the looper or under needle L. The bend in the looper-arm I is for convenience in placing the arm in its desired position and to avoid the shaft 0 and any other mechanism which may be on said shaft. The rear or pivoted end of the looper-arm I is, however, not pivoted to the table A, but to one end of a lever H, which is pivoted at h to the table or machineframe and is vibrated by means of a rod J,

- Which at one end is connected to the lever H by a ball-and-socket joint and at its other end surrounds an eccentric J upon the main shaft C. This gives the lever H and looperarm I carried thereon a slight transverse reciprocation at each revolution of the shaft C.

To the outer or swinging end of the looperarm I is connected by a ball-and-socket joint a rod K, the other end of which is also connected by a ball-and-socket joint with the lower extension B? of the lever B, which operates the needle-bar. This gives the looperarm a swinging motion upon its pivot, or a motion toward and from the upper needle bl This construction, it will be noticed, locates the lever H at the back side of the machine, or that side which is farthest from the operator, and leaves the front free for access to any mechanism, as a trimmer, which may be placed upon the shaft 0. It also keeps the looper-arm I in the same plane all the time and does not raise or lowerthe looper L.

The feed-bar D is pivoted at its rear end upon a shaft carried in the frame E, said frame being in turn pivoted at its lower edge upon a shaft E, carried by the table or frame A. Upon the outer end or extension of the shaft 0 is mounted an eccentric G, about which is a strap F, to which is connected or formed as a part thereof a rod F, carrying a bolt f, said bolt extending through the slot in a yoke e, formed upon or secured to one end of the frameE. This eccentric serves to oscillate the frame E, and thereby to give the feed-barD its horizontal motion. The extent of this horizontal motion may be varied by shifting the position of the boltf. The vertical movement of the feed-bar is secured by means of an eccentric D, mounted upon the shaft C and lying between the lower surface of the feed-bar and a bar d, secured thereto and extending beneath the eccentric.

The character of the means for adjusting the horizontal movement of the feed-bar herein shown and its location at the end of the machine outside of all the other mechanisms enable the same to be adjusted accurately and very quickly. As a matter of fact the adjustment may be secured While the machine is running, if this is desirable. The position of the rod F relative to the yoke e is secured after adjustment by tightening the nut upon the end of the bolt.

The device as a whole is one designed to be durable and accurate in use and very convenieht and rapid in adjustment.

I claim- 1. In a sewing-machine, the combination with a main shaft extending lengthwise beneath the Work-plate, an upper needle, a needle-actuatin g lever and means for reciprocating it, of a looper-arm-supporting lever lying substantially parallel with the main shaft and pivoted intermediate its ends to swing in a substantially horizontal plane, an eccentric upon the main shaft, and connections from said eccentric to said looper-arm-supporting lever to vibrate it, a looper-arm pivotally supported upon one end of the supporting-lever to swing horizontally, said looper-arm extending forwardly or across the direction of the main shaft, and a link connecting the needlecarrying end of the said looper-arm With the needle-actuating lever.

2. In a sewing-machine the combination with a reciprocating needle-bar and needle, a pivoted looper-arm, a looper carried by said arm, a pivoted needle bar-actuating lever, and a link connecting said needle-bar-actuating lever With the needle-carrying end of the looper-arm, and means for carrying the looper-pivot laterally of the path of travel of the needle.

In testimony whereof I have signed my .name to this specification in the presence of the two subscribing Witnesses.

ED WARD MURPHY.

Witnesses:

H. L. REYNOLDS, CHAS. J. RATHJEN.

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