US235725A

US235725A - baroellos

Info

Publication number: US235725A
Authority: US
Publication date: 1880-12-21
Anticipated expiration: 1897-12-21

Description

UNITED STATES DANIEL BAROELLOS, OF BROOKLYN, NEW YORK.

BUTTON-HOLE SEWING-MACHINE.

SPECIFICATION forming part of Letters Patent No, 235,725, dated December 21, 1880.

Application filed May 8, 187.).

D. W. G. Humphrey, August 29, 1865.

The objects of my improvements are to secure a positive and accurate movement of the feed mechanism, to provide for the prompt variation of the feed as required.

In the accompanying drawings, Figure 1 is a plan View of a portion of a button-hole sewing-machine, the clampplate being removed 7 to show in part the feed mechanism and the clamp-pla teadjusting device. Fig. 2 repre sents a bottom view of a portion of the machine. Fig.3 represents a section of the inverted machine on a plane coincidentwith the diameter of the t'eedavheel. Fig. 4 is a detail view of an adjustable pawl constructed according to my invention. Fig. 5 is a bottom view of the machine, showing the feed-operating lever and its motive cam.

The letter a designates the bed-plate of the machine, and b is the ratchet or feed wheel, which in a complete machine is connected with the clamp-plate in the ordinary manner, as in Humphreys patent, before referred to.

Pivoted in recesses in the bed-plate are pawls d cl, engaging with the teeth of the wheel b and. held thereto by suitable springs. These pawls (1 cl are adjustable in length, being made in two parts, the outer one of which has a screw-shank, y, which screws into the other, as shown in Fig 4, so that the adjustment may be made to compensate for wear, or in originally assembling the parts. The bottom of the recess and the covering-plate prevent the tongue portions of the pawls from turning when in place. The pawls d d in Fig. 1 are provided with double tongues projecting in opposite directions, and either of which may be turned to engage With the teeth of the wheel, and thus the desired adjustment may be attained within the limit, of halt the distance from thread to thread.

At 0 c is indicated in dotted lines a camgroove in the lower face of wheel I), said groove in its half 6' having a somewhat shorter radius than in the other halt. Into this cam-groove extends a pin, '0, projecting from a curved lever, r, which is pivoted to the under side of the bed-plate by a screw-pin, u, the end of the extended portion of this lever being connected by a link, t, with a stop-pawLj, pivoted to an adjustable lug, w, secured to inner side of the race-block 0, said stop-pawl j havinga movement across the top of the side wall of the raceway, and partially across the raceway, as shown in fulllines, Fig. 1, and dotted lines, Fig. 2. The function of this pawl will presently appear. The race-block 0 is secured. to the under side of the bed-plate, and the rabbeted upper edges of its side walls form the raceway upon which reciprocates a pawl-carrier, i, having pivoted upon its upper side, as shown in Fig. 1, a pawl, 9, provided with an adjustable tongue, f, which engages with the teeth of the feed-wheel I), being held thereto by a suitable spring.

From the pawl-carrier t a broad-faced lug, a, projects downward in the path of an adjustable tappet, Z, arranged in the end of a vibratory lever, 70, fulcrumed on the under side of the bed-plate, and having its other end in contact with the edge of a rotary cam, having two portions of unequal length on opposite sides of its shaft, so that it will impart alternately long and short strokes to the lever, which, in turn, imparts corresponding movements in one direction to the pawl-carrier by striking the lug n, and causes the pawl-tooth f to propel the feed-wheel. The return movement of the pawl-carrier i is caused by a spring, Z.

When the feed-wheelb is in such part of its revolution that the pin a is in the smaller portion 6 of its cam-groove the lever 'r is moved inwardly to the position shown in Figs. 2 and 5, and the stop-pawlj stands in the position shown in full lines, permitting the pawl-carrier i to follow back the tappet l as far as the stop-block p, which is adjustably secured in the race-block. The tappet, in the vibrations of the lever, will drive the pawl-carrier, first,

per revolution of the cam-shaft.

so far as will suffice to advance the wheel b one tooth, and at the next stroke far enough to advance said wheel three teeth, while the cam-shaft is making one revolution, these short and long feeds resulting from the unequal projections of the cam.

When the large portion 0 of the cam-groove of the feed-wheel embraces the pin a; the leverr will, be moved to such position as to hold the stop-pawl in the position indicated by dotted lines, as at j, Fig. 2, so that its tip stands in the path of and limits the return movement of the pawl-carrier, holding it beyond the range of the short strokes of the lever, and in such position that the long strokes will cause the wheel I) to be advanced one tooth I preferably arrange the relative adjustments of the parts to produce a two-tooth feed instead of the one-tooth feed, and a four instead of a three-tooth feed, as just described.

In order to avoid the disagreeable and damaging jarring and clicking observed in most machines of this class, I face the lug a and the abutting surface of the pawl-carrier with leather, rawhide, or similar material.

For the purpose of adapting my improvement to machines already made, and which have the cam-groove in the feed-wheel of greater throw and less prompt change than is required for the best action of my devices, I form a slot in the end of the link t, where it is connected to the lever r, so that the length of the said link may be regulated to cause the pawl j to be actuated only by the last part of the throw of pin 1;.

The letter 0 designates an ordinaryinclined toothed wheel mounted in a recess in the bedplate, and having its teeth in engagement with those of the wheel I). The shaft of this What I claim is-- 1. The combination, with the ratchet feedwheel provided with the cam-groove having a variable throw, of the reciprocating pawlcarrier provided with an impelling-pawl engaging the teeth of said feed-wheel, the movable stop-pawl for varying the movement of the pawl-carrier, the lever r, connected with said stop-pawl and having a pin extending into the cam-groove of the feed-wheel, and suitable devices connected with the drivingshaft of the machine for imparting a reciprocating motion to the pawl-carrier, substantially as described.

2. The combination, with the feed-wheel and race-block, of the reciprocating pawl-car rier and its pawl, the stop-pawlj, pivoted to the pawl-carrier, the lever 1", connected with said stop-pawl and operated by the feed-wheel, the vibratory lever k, mechanism for imparting thereto alternately longer and shorter strokes for actuating the pawl-carrier, and suitable pawls for preventing back movement of the feed-wheel, all arranged and operating substantially as described, and for the purpose set forth.

3. The combination, with the toothed feedwheel provided with the cam-groove e e, of

the reciprocating pawl-carrier and its pawl, the lug a, depending from said pawl-carrier, the vibratory lever 70 for striking said lug, the rotary cam is, having unequal projections, for imparting alternately long and short strokes to said lever, the movable stop-pawlj, the lever 1, connected with said stop-pawl by a suitable link, and having the pin 1; extending into the cam-groove of the feed-Wheel, and suitable pawls for preventing back movement of said feed-wheel, all arranged and operating substantially as and for the purpose set forth.

DANIE L BARGELLOS.

Witnesses:

N. W. WHEELER, HENRY V. FREEMAN, EMERSON W. QUICK.