US19155A - Improvement in sewing-machines - Google Patents

Description

" J. & A. w. SANGSTER.

I Sewing Machine.

No. 19,155. Patented Jan. 19. 1858.

'W't eases Inventor's:

. view of the machine complete.

U ITED STATES PATENT OFFICE.

JAMES SANG-STER AND AMOS- w. sn'ncs rnn, on BUFFALO, NEW YORK.

IMPROVEMENT IN SEWING-MACHINES.

Specification forming part of Letters Patent No. [9,155, dated January 19, 1858.

' T0 (tZZ whom it may concern:

Be it known that we, JAMES SANGSTER and Arms W. SANGSTER, of Buffalo, in the county ence'being had to the accompanying drawings.

The same letters in Figures 2, 4, and '5 refer to like parts in each. Fig. 1 is a perspective It also represents the feeding apparatus.

A is the feedinghar, which is attached to the frame-work by a screw at the point G. Its upper part is made of elastic metal, so as to spring backward. The spring-bar F is con nected to the feed-bar A by a smallrod, H. I is a nut for fastening said rod.

Bis a bar, which terminates in an elastic foot-piece, for the purpose of holding the cloth firmly down on the plate J.

G is a nut formed of six or more squares or fiat surfaces, (it may also be made round,) and screws up or down the needle-bar.

The feed motion is given as follows: 'VVhen the needle-bar is ascending, the nut O rubs against the lower part of the bar F and forces it backward from said needle-bar,-and at the same time, by means of its connection with the rod H to the bar A at the point I, it pulls said feed-bar A, and thus pushes the cloth (or fabric to be sewed) one stitch ahead. The downward movement of the needle-bar allows the bar A to spring backward, so that another stitch will be taken when the bar ascends again. The length of the stitch is varied by raising or lowering the nut O by means of the screw upon the needle-bar.

Fig. 2 represents the looper when it is in a position to hold the loop firmly and to open it properly for the needle to pass through.

A is a piece of fiat metal, (rounded at the 1 point,) which catches the loop. It is jointed,

and swings loosely on the bar or frame B at the point .0.

Z is a cross-piece, upon which the point WV of the bar A rests when the loop is formed. The bar marked B swings back and forth, and is attached to the plate D at the point E by means of a rivet, around which it is made movable.

F is a lever, which forms part of the frame B.

J K aretwo pins, projecting upward from the plate D, and operate as stationary guides to the bar A. y I

L is a groove or guide impressed in the plate D for the reception of the needle.

M is a forked bar, attached to the-frame B at the point N, and is made to move easily upon the pivot at N. This bar is made elastic, so that the points may spring together after being separated.

P is a friction-spring attached firmly to the bar M, as may be particularly seen by refer ence to Figs. 2 or 4 of the accompanying drawings.

G is a lever, which gives motion to the looper and receives its motion by the revolving of an eccentric, as will be readily seen by reference to Fig. 1 of the accompanying drawings. In that figure the eccentric is attached to and revolves with the shaft R. i S is a rod fastened to the eccentric and at tached to the lever G.

T is a stay or support, upon which the lever G swings at the point U.

T-he looper is worked as follows: When the lever G in Vibrating brings the pin H down to its lowest point, as shown in Fig. 4, the frame B is forced back from the needle and the piece A is thrown into a horizontal position by its upper part rubbing against the pin K, and it is supported in that position by the pin J. WVhen thelever G ascends, the'pin H hits against the lower end of the frictionspring 1?, and in passing it the pin moves the frame-work at the point E'as a center. The frame-work B is thus moved forward and moves the piece A between the thread and the needle, thence upward to its point of rest on the cross-piece Z, below which the loop forms, and is held open, as seen in Fig. 2. The end of the piece A is made narrower thanthe aperture at V, so that the thread maypass freely at each side of it. When the needle descends, the pin H forces its way downward between the points at X in the spring-frame M, and thus reverses the action of the looper. The piece A is thus made to release the loop, as shown in Fig. 5, and to regain its position, as shown in Fig. 4..

The whole machinery, shown by Fig. 2,

thread and the needle, and it should be so nicely attached to the bar B, and so operated by that bar, that its point will rest against the plate D after it passes between the thread and the needle in its course upward and till 'it passes onto the cross-piece Z.

We claim* The looper A, in combination with the plate D and the cross-piece Z, substantially as herein described, for the purpose of catching the loop and causing it to be formed round the Looper A and held open in the aperture V for the reception of the needle.

JAMES SANGSTER, AMOS VV'. SANGSTER.

Witnesses:

D. D. BIDWELL,' H. M. GAYLORD.

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