US623271A - Feeding mechanism for sewing-machines - Google Patents

Description

N0. 623,27l. Patented Apr. l8, I899.

E. B. ALLEN. FEEDING MECHANISM FOR SEWING MACHINES.

(Application filed June 20, 1898.]

(No Model.)

' W/ TNE SSE 8 64W? :7 E 4? yr UNHTE STATES PATENT FFlCEt EDlVARD B. ALLEN, OF ELIZABETH, NEWV JERSEY, ASSIGNOR TO THE SINGER DIANUFAOTURING COMPANY, OF NElV JERSEY.

FEEDING MECHANISM FOR SEWING-MACHINES.

SPECIFICATION forming part of Letters Patent No. 623,271, dated April 18, 1899. Application filed June 20, 1898. S ri N01 683,928- No model-l 1'0 tall whom it may concern.-

Be it known that I, EDWARD B. ALLEN, a citizen of the United States, residing at Elizabeth, in the county of Union and State of New Jersey, have invented certain new and useful Improvementsin Feeding Mechanism for Sewing-llachinespf which the following is a speci fication, reference being had therein to the accompanying drawings.

This invention relates to that form of sewing-machine feeding mechanism which has long been used in the wellknown Singer lock-stitch machines and in which the forward and backward movements of the feedbar are imparted thereto from a rock-shaft arranged beneath the work-plate and operated by a link or feed connection, which in turn has heretofore been actuated by a cam on the upper or main shaft working in a yoke or fork with which the upper end of said link or feed connection was provided. The movement of the said link or feed connection is mainly a vertical one, so that there is a limited sliding contact between the cam and the inner faces of the fork referred to, and this sliding contact has caused more or less wear of certain parts of the fork and cam. This wear causes a looseness of the parts which is particularly objectionable in high-speed machines, as it occasions pounding, which increases the wear and looseness, so that for effective and smooth operation of the machine a renewal of the worn parts soon becomes necessary.

The object of the present invention is to obviate the difficulty referred to,'and thus provide a smoothly-operating feeding mechanism of the class in question which will not be subject to the objectionable wear referred to. This object is secured by providing the main shaft with a feed-operating eccentric which is encircled bya strap,one end of which is jointed to the upper end of the feed connection or link, the cam heretofore used and the fork at the upper end of the link or feed connection being dispensed with.

In the accompanying drawings, Figure l is a partial broken-out side view of one form of a Singer machine embodying the invention, the frame beinginsection on line 1 1, Fig. 2; and Fig. 2 is a vertical section on line 2 2, Fig. 1.

A denotes a portion of the arm of the machine, and B the rotating main or driving shaft journaled in the upper part of said arm and provided with afeed-operating eccentric I), encircled by a strap 1).

C is a rock-shaft arranged beneath the work-plate and serving toimpart the forward and backward movements to the feed-bar D, said shaft having at its rear end an arm 0 and at its forward end a second arm 0, to which latter the said feed-bar is jointed.

E is the link or feed connection to an arm or part c, on the upper end of which the cocentric-strap b is jointed at-b the lower end of said link being jointed to the arm cof the shaft 0. The link or feed connection E is joined to the feed regulating lever F by a link fin the usual manner. The lever F- is pivoted at e on the stud a within the arm A. The feed-barD receives its vertical or up and down movements, as heretofore, from the feed raising and lowering rock-shaft G.

In the operation of the machine the link or feed connection E is reciprocated vertically from the eccentric b to impart rocking movements to the feed-shaft G, the extent of these vertical movements being varied in accordance with the position of adjustment of the feed-regulating lever F. By raising the outer end of said lever the vertical movements of said link are lessened to decrease the throw of the feed-bar, the actuating movements of the eccentric Z) being converted into increased vibrating or lateral movements of the upper end of said link, as the vertical movements thereof are decreased owing to the connection of said link E with the feed-regulating lever through the linkf.

From the foregoing it will be apparent that as the eccentric?) rotates smoothly in its strap 1) there will be no such wear as has heretofore resulted from sliding contact between certain limited portions of the operating parts and which has occasioned wear of certain por tions of the cam and fork heretofore employed, the wear between the eccentric and its strap being practically unappreciable, because nniform, and being capable of being taken up'or compensated for, if necessary, Furthermore, the lubricating-oil is much better retained in the eccentric-strap than in the yoke heretofore employed, and thus tendency to Wear is further lessened.

Having thus described my invention, I

claim and desire to secure by Letters Pat ent- 1. InaseWing-machinefeedingmechanism, the combination with an upper main shaft, as B, provided with an eccentric, of a feed-operating rock-shaft 0 having at its rear end an arm 0 and at its forward end an arm 0', a feedbar jointed to the said arm a, the rigid link E jointed at its lower end to the said arm 0, a strap Z) encircling said eccentric and jointed to the upper part of said link E, the feedregulating lever F, and the linkfjointed to said lever F and link E.

2. In aseWing-machine feeding mechanism, the combination with an upper driving-shaft, as B, provided with an eccentric b, of a feedoperating rock-shaft 0 having arms 0 and c, a feed-bar connected to said arm a, the rigid link E jointed to said arm cand having at its upper end an arm e, a strap 1) encircling, said eccentric and jointed to the said arm e, the feed-regulating lever F, and the link f j ointed to said lever F and link E.

In testimony whereof I affix my signature in the presence of two Witnesses.

" EDWVARD B, ALLEN. \Vitnesses:

HENRY J. MILLER,

HENRY CALVER.

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