US183678A - Improvement in sewing-machines - Google Patents

Description

J'. JAMIESON.

SEWING-MACHINE.

N.183,678. Patented ot.z4,1a7e.

WW Jaimes Jamieson.

N. PETERS. PHDTO-LITMOGRAPHER, WASHINGTON. D C.

JAMES JAMIESON, OF HAMILTON,

PATENT DEEICE ONTARIO, CANADA, AssIGNoE To RICHARD MOTT WANZER, OF SAME PLAGE.

IMPROVEMENT IN SEWING-MACHINES.

Specification forming partof Letters Patent No. 183,678. dated October 24, 1876 application tiled December 23, 1874.

To all whom it may concern:

Be it known that I, JAMES J AMIESON, of the city of Hamilton, in the county of Wentworth, Province of Ontario, Dominion of Canada, have invented certain new and useful Improvements in Sewing-Machines; and I do hereby declare that the following is a full, clear, and exact description of the construction and operation of the same.

This invention relates to an improved takeup for sewing'machines, its object being to dispense with the ordinary wire take-up devices, as heretofore constructed, which are operated entirely by the upward and downward motion of the needle-bar in conjunction with springs, and provide a take-up that is operated partially by a caxn on the drivingshaft of the needle-bar, and partially by the motion of the needle-bar, whereby a more simple and effective take-up device is obtained.

The invention consists in a take-up lever, pivoted in the head of the standard in which the upper works of the sewingmachine operate by means of a spring-pivot, which gives said take-up a portion of its downward movement, in combination with a cam on the disk, which drives the needle-bar through the niediurn ot the usual cam-plate, said take-up arm passing through a slot in said needle-bar, and being partly operated thereby on its upward and downward movement, as more fully hereinafter set forth.

In the drawings, Figure l represents a side elevation of a portion of the upper standard of a sewing-machine and the works supported thereby, and Fig. 2 a top view of the head of such standard.

The letter B represents the standard which carries the upper works of the sewing-machine, and C the driving-shaft of said upper works, having at one end a disk, D, provided with an eccentric for working in the camgroove in the cam-plate F, secured to the needle-bar G, as usual. Upon the rear face of said disk or wheel D is formed a cam, E, against the face of which bears the arm n of the take-up lever J, which is pivoted in the head H by means of a pivot, p, surrounded by a spiral spring, which gives the downward movement to the take-up lever, as hereinafter described. The other arin of said lever extends through slots in the head and needlebar, and is provided at its outer end with an eye, through which the head is passed on its way from the tension device to the needle.

The cam E is so shaped and arranged relatively to the needle-bar that on the return stroke of the needle-bar, after having been pushed fully down, the cam will operate on the inner arm of the take-up and elevate it a portion of its movement, the needle-bar, as it continues its motion, taking up the outer arm of' said takenp, and continuing its motion until fully elevated. On the downward movement of the needle-bar the lever J is released, when the spring on the pivotp comes 1n play, forcing the outer end of the lever J downward in position to give slack of thread, so that the shuttle will pass between the thread and needle, the inner arln n of the take-up lever following the depression in the ealn E on the disk D, which drives the needle-bar.

What I claim, and desire to secure by Letters Patent, is-

In combination with the take-up J, the cam E and slotted needle-bar G, the several parts being arranged as described, whereby the proper motion is imparted to the take-up, as and for the purpose set forth.

JAMES JAMIESON.

Signed in the presence of- WM. BRUCE, P. L. ScEIvEN.

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