US24737A - Improvement in sewing-machines - Google Patents

Description

.3 Sheets-Sheet i. G. HENSEL.

Sewing Machine.

Patented July 12, 1859.

G. HENSEL. 3 SheetSf-Sheefl- Sewing Machine.

No. 24,737. v Patented July 12; 1859.

N. PETERS Fhnlo-Lhhngmpher. Wnhingmn. D4 0.

G. HENSEL.

Sewing Machine.

3 Sheets-Sheet 3.

Patented July 12 1859.

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UNITED STATES PATENT OFFICE.

GEORGE HENSEL, OF NEW YORK, N. Y.

IMPROVEMENT IN SEWING- MACHINES.

Specification forming part of Letters Patent No. 2 1,737., dated July 12, 1859.

. is an inverted plan of the same.

Similar letters of reference indicate corresponding parts of the several figures.

This invention consists in an improved contrivance of working and regulating the feed.

A is the bed-plate or table upon which the cloth or material rests during the operation.

B is an ornamented stand erected on the bedplate A to contain the needle-bar G and the lever l) E, by which the needle-bar G is operated, said lever deriving the necessary motion from the crank-pin n of the crank F, which is secured to the driving-shaft G, and which enters a slot in the arm E of said lever.

H is a bracket screwed to the under side of the bed-plate A and carrying in its end the pin J, capable of revolving. This pin J is provided with a pinion, p, and has on its up per circumference the looper 9, Fig. IV. This looper consists of a hook attached by means of a short arm to the circumference of the upper end of the pin J. The pinion p, which is firmly attached to the pin J, gears with a toothed rod, K, which latter is guided in the bracket H and in a projection, a, fast to the under side of the bed-plate A,-and is connected to an arm, L, from which latter said rod K receives a backward and forward motion by means of the crank-pin n, which enters a slot in said arm L. By this arrangement an oscillating motion is imparted to the pin J causing the same to make nearly a full revolution back and forth and giving a corresponding motion to the looper 9, whose point almost touches the face of the needle just above the upper end of the needle-guide and close to the under side of the bedplate.

Nis the needle-guide, attached to the bracket H, and provided with an open groove just wide enough to receive the I needle, and in which the needle works and is guided.

M is the thread-case, laid loosely on the top of the pin J, and prevented from falling off the same by the bed-plate A. This threadcase, Figs. IV and V, contains a bobbin, w, on which the locking-thread is wound, and said locking-thread is laced through a number of holes in said case in the same manner as it generally is done in shuttles to produce asufii,

cient tension upon it by friction. This threadcase is laid loosely on the top of the pin J, as

above described, but is prevented from turning, while said pin J oscillates back and forth by its own thread passing upward through the hole made in the plate 'A for the passage of the needle.

The operation of the thread-case and looper, in combination with the needle, is as follows: The needle having carried its thread through the cloth or other material to be sewed, in the usual manner, and then been slightly retracted to throw the thread slack and form a small loop, the looper gadvances in the direction of the arrow shownnear it in Fig. III, takeshold of the needle-thread, and extends the slack in the form of a loop and passes the same around the thread-case M, when the loop is at liberty to slip off the hook on the looper, when the continued upward movement of the needle draws it off, leaving the thread from the thread case encircled by it, and causing it when drawn tight to be locked by the latter thread.

0 is the pressure-pad, which confines the cloth to the surface of the table and to the toothed surface of the feeding-dog h. This feeding-dog h is attached to and forms part of a bar, P, fitted to slide longitudinally in a guide, m, under the bed-plate. The inner end of the bar P is also capable of a slight rising and falling motion to make the dog press the cloth against the pressurepad O, that it may be caused to take a firm hold before moving in the direction to feed it. The longitudinal movement of the bar P, by which the feeding of the cloth is effected, is produced by the action of the lever Q against a projection, y, attached rigidly to said bar 1?. The lever Qturns upon a center, f, and is made to p'ress with one end against the projection y on the bar 1?, and with the other end against the surface of a circular disk, \V, which is firmly attached upon the shaft G. The movement upward of the bar P preparatory to the'feeding movement is produced by a projection, s, on the top edge of the bar or rod K, which passes in contact with the bottom of the bar I, the descent of the bar P, to carry the feed-dog out of contact with the cloth before its retreat, is produced by a spring, 8, and the retreating D10- tion of said bar is produced by the spring 5, Fig. III. a

To provide for the variation in the feed to vary the length of the stitch a flexible plate, R, is attached to thediskVV, one end of which is firmly fastened to said disk W, while the opposite side is acted upon by a smallcani, as, fast to the pin 3, Figs. VI and VII, which-latter passes in its revolution through an opening in the bed-plate A, so as to be regulated from the upper surface of the machine. According to the surface of the cam 00, which acts against the flexible plate R, more or less mo- GEORGE HENSEL.

\Vitnesses:

HENRY E. ROEDER, J AMES 'ELGAR.

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