US111488A - Improvement in electro-magnetic sewing-machines - Google Patents

Description

2 Sheets-Sheet l.

G. STEVENS & J. HENDY. ELECTROMAGNETIC SEWING MACHINE.

N0.111,488. Patented Jan.31, 1871.

Shae/k N 1.

2 5heats-Sheet 2.

G. STEVENS & J. HENDY.

ELECTROMAGNETIC SEWING MACHINE.

No. 111,488. Patented Jan. 31, 1871.

&

m: Norms Pmzns co, wo ouwa, wlsmuomm u. c

l t F l UNITED STATES PATENT OFFICE.

GEORGE STEVENS AND JOSHUA HENDY, OF SAN FRANCISCO, CALIFORNIA.

IMPROVEMENT IN ELECTRO-MAGNETIC SEWING-MACHINES.

Specification forming part of Letters Patent No. 1|,48S, dated January 81, 1871.

To all whom it may concern;

Be it known that we, GEORGE SrEvENs and JOSHUA HENDY, of the city aud county of San Francisco, State. of (ialifoinia, have invented an ElectroMagnetic Sewing-Machine; and we do hereby declare the following description and accompanying drawings are sutficien-t to enable any person skilled in the art or science to which it most nearly appertains to make and use our said invention or improvement-swithout further invention or experiment.

Our invention relates to an improved methodot'drivings sewing-machines; audit consists in a novel arrangement of apparatus which forms .the electro-motor, by which greater power is attained from the coils.

It also consists in a device for regulating the power and speed of the machine, which is very important as it brings it completely under control.

The invention alto consists in constructing the machine so that the needlc'bar is driven directly from the armatures or coils without the intervention ofcranks or wheels ofany sort.

Referring to the accompanyiu g drawin gs for a more complete explanation of our invention, A is a base-board, conveniently arranged to support the apparatus; or it might be placed directly upon the table of the sewing-machine, if more convenient. Two pairs of coils, B and O, are placed upon this board, standing vertically, and far enough apart to admit an oscillating beam, D, between the pairs. This beam is balanced so that the magnets or armatures of one pair'of coils are attached to one end and those of the other pair to the other end. The coils are constructed, as shown in Sheet 2, Fig. 8, with an iron cylinder inclosing them, this form giving greater power to the magnets with a given length of wire. Outside the cylinder another coil may be placed, and a cylinder outside this, alternating; but the additional power after the first cylinder is not in the same position.

The magnets b and c are made, as usual, of soft iron, and each pair of bars are united at the top by a plate, d; or they may be formed in one'piece, as an ordinary U-magnet. The magnets extend down into the coil about twothirds of their depth, and the armaturesf rise from the bottom about one-third of the height of the coil, this construction adding greatly to their power.

The oscillating beam D has one end connected to each of the plates (1, and from some convenient point in its length the needle-bar E arises and extends forward to the table of the sewingmachine, over which the work passes.

From the center of the beam I) an arm, F, depends, and as the beam oscillates the bar vibrates from side to side, striking alternately the pins on and it. These pins are fastened to a vibrating bar, i, which is pivoted at the bottom, and which is caused to move from side to side, thus alternately forming and breaking contact with the two pole-changers g and h. This causes the pairs of coils B and U to act alternately, and by them the magnets, with the beam D and the needle-bar, arecaused to move. By means of a connecting-rod, V, the feed-inotion may also be operated.

In order to regulate and vary the power so as tohave it completely under control, one pole of the battery is connected with the cup 0 and the other extreme connects with the cup 1). Between the extremes of the battery one or more wires lead outat different points and connect ill. cups, as at r. A switch, S, is so placed that by connecting it with one of the buttons t the whole power of the battery will be employed, and by connecting it with an other a less power will be used. The wires are arranged in any of the well-known modes, as partially indicated in dotted lines on Fig. 2.

Although but three'cups are shown for the connections, yet it will be manifest that any number may be employed to suit convenience.

In the arrangement of the coils, also, if it were desired, more than one pair might be connected with each end ofthe oscillating bar, but we have found one pair sufiicient with our improved manner of constructing them.

The manner of constructing the pole-changers may be much varied without material difference in the result.

Having thus described our invention, what we claim, and desire to secure by Letters Pat out, is--- 2 IILASS 1. Constructing the machine so that. the nee- In witness that the above-described invendle-bur shall be operated directly from the election is claimed by us we have hereunto set 0111 tro-magnets, either with or without the interhands and seals.

vention of levers, so that the oscillation of the armatures between two or more electro-mag- GEORGE STEVENS. [L. 8.] nets shall cause asiinildr movement to the JOSHUA HENDY. [L. 3.]

needle.

2. In an electromagnetic sewing-machine, Witnesses: the cups 0 p rand switch s, connected with the M. MEAGHER, battery, so as to vary the power, substantially V. CUSHING.

as herein specified.

Images