US378804A - John w - Google Patents

Description

(No Model.)

- J.'W. POST.

SEWING MACHINE.

Patented Feb. 28, 1888.

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NITED STATES JOHN WV. POST, OF NEW YORK, N. Y.,

PATENT OFFICE.

MAOHIN E COMPANY.

SEWING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 378,804, dated February 28, 1888. Application filed October 26, 1885. Serial No. 1R0,993. (No model.) Patented in England November 21, 1895, No. 14,277.

To aZZ whom it may concern:

Be it known that I, JOHN W. Posr, a citizen of the United States, residing at New York, in the county of New York and State of New York, have invented certain new and useful Improvements in Sewing-Machines; and I do hereby declare the following to be a full, clear, and exact description of the invention.

This invention relates to improvements in sewing-machines, and has for its object to improve their construction, more particularly the construction of the needle-operating lever with its bearing on the overhanging arm of the machine.

In the accompanying drawings, Figure 1 is a view of a machine constructed in accordance with my invention, showing in section a portion of a bed-plate of a sewing-machine, the overhanging arm andneedle-operating lever in elevation. Fig. 2 is a top plan View of the same. Fig. 3 is a sectional view showing the manner of connecting the needle operating lever to the overhanging arm.

Similar letters of reference in the several figures indicate the same parts.

H represents the bed-plate of the machine, upon which is formed or secured the standard I, supporting the overhanging arm I, to the forward end of which is secured a head, 1 On the under side of the bed-plate are formed small brackets or lugs h h h, forming the bearings for the driving shaft K, on the end of which is a fly-wheel, K, having a groove, h, in its inner side for the application of the driving-belt in the ordinary manner. Inside the pulley K, upon the shaft, is formed an eccentric, W, from which the needle-operating lever V is operated by means of a pitman, V, the lower end of which is provided with a strapconnection, '0 embracing said cam, while the upper end is provided with a similar strapconnection, a, tightened by a screw, a

To simplify and cheapen the construction of the machine, I prefer to form the fiy-wheel K, the beltpulley-k, and eccentric 7c in one piece with the driving shaft K. At the forward end of the driving-shaft K is formed an eccentric boss, 70, for operating the feed-bar L, carrying the feed-dog L, of the ordinary construction. 'Ihe eccentric boss It works in a slot in the feed-bar in ,a well-known manner,

(that carries the usual eye-pointed needle) and the presserbar M, carrying a presserfoot of the ordinary or any suitable construction, said presser-foot being held upon the work by a spring (not shown) encircling the presser-bar,and may be lifted from the work, when desired, by means of an eccentric liftinglever, O.

The needle-bar N is, as stated, reciprocated in vertical bearings in the head 1 by means of the operating-lever V, pivoted upon the standard, said pivotal connection being formed in a manner to be described. The end of the bar is split and embraces a projection on the needlebar, the connection being tightened,when de sired, by means of a screwm passing through the split end, as shown, and the rear end of the lever is provided with a projection encircled by a collar or strap-connection, a, tightened by a screw, a as will be readily understood.

The oscillating lever V has a tapering or conical pivot, 12, formed integral therewith, that is seated in a correspondingly-formed recess in the standard I. The pin 22 is slightly shorter than its hearing or seat, and an adjust ing-screw, o, is fitted in its tapering end, the head of which bears on the rear side of the arm I, as in Fig. 3, so that it will hold the pin tightly in place; and should the parts become worn and work loose, it is only necessary to tighten up the screw e thereby forcing the tapering or conical pivot 22 farther into its seat or bearing, as will be readily understood.

The described construction is a very convenient one for taking up the wear of the parts referred to; but if the screw 11 should wear or not accurately fit the socket in end of pin 2) it would work loose under the influence of the movement of the pivot-bearing and the friction and the head of the screw on the arm I. To obviate this, I form an axial perfora-- tion, 1), in the pin a, for the reception of the looking or set screw 12*, and when the set-screw 12* is adjusted this locking-screw is tightened and made to bear against the inner end thereof, so as to hold it against accidental rotation.

The described arrangement of locking de vice for the screw '0 not only performs its function in admirable manner, but is advantageous in giving the device a finished appearance, and, further, in that it can be manipulated very readily without the use of wrenches.

When desired to remove the lever V, it is only necessary to loosen screw V and remove 12 It will be noted that the screw V has a long smooth portion not screw-threaded, and that its threaded portion is only near its outer end, and this is for the purpose of obviating the necessity of threading the perforation its whole length and for providing a smooth bearing.

Having thus described my invention, what I claim is 1. In a sewing-machine, the combination, with the overhanging arm having the conical socket, of the needleoperating lever having the bearing pin or stud thereon provided with the longitudinal perforation, the screw operating to hold the stud in its bearing and to be adjusted to take up wear, and the screw operating through the perforation in the stud to lock the first-mentioned screw in adjusted position, substantially as described.

2. In a sewing-machine, the combination, with the overhanging arm having the conical socket, of the needleoperating lever having the tapered bearing-pin provided with the longitudinal perforation, the screw operating to hold said stud or hearing pin in position,and thelocking-screw having the long smooth portion and the threads near its outer end,adapted to bear against the first-mentioned screw and hold it in position, substantially as described.

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

JOHN XV. POST.

Witnesses:

Gno. W. COOK, J NO. H. BOARDMAN.

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