US842291A - Stop-motion device for sewing-machines. - Google Patents

Description

PATE'NTED JAN. 29, 1907.

. E. B. ALLEN. STOP MOTION DEVICE FOR SEWING'MAGHINBSR APPLIOATION FILED JAN. 29, 1906.

2 SHEETSSHEET 1.

filli PATENTED JAN. 29, 190?.

E. B. ALLEN. STOP MOTION DEVICE FOR SEWING MACHINES.

APPLICATION FILED JAN. 29. .1906.

2 SHEETS-BREE! 2.

java/Lia .stitch-forming mechanism -unlrrnn snares gnTENT OFFICE.

EDWARD B. ALLEN, OF ELIZABETH, NEW JERSEY, ASSIGNOR TO THE SINGER MANUFACTURING COMPANY,

A CORPORATION OF NEW JERSEY.

STOP-MOTION fiEVICE FOR SIWING-MACHINES.

' Patented Jan. 29, 1907.

Application filed January 29, 1906. Serial No- 298,435.

To mil Lilli/07771 it may concern:

Be it known that I, EDWARD B. ALLEN, a citizen of the United States, residing at Elizabeth, in the county of Union and State of New Jersey, have invented or discovered certain new and useful Improvements in Stop-Motion Devices for Sewing-Machines, of which the following is a specification, ref erence being had therein. to the accompanying drawings.

This invention relates to that class of stopmotion devices for sewing-machines by means of which such. machines may be automatically stopped after groups of a desired number of stitches have been made, as in stitching buttonholes, sewing on, buttons, forming bars 1- tacks, and in other similar sewing operations requiring the formation of groups of a predetermined number of stitches, the invention having for its object to provide a stop-motion device or mechanism of the class referred to which will include a :frictiolnpad so arranged and operated that the machine may be brought almost to a full stop by said pad before a positive stopping device comes into operation to finally arrest the movement of the driving-shaft of the machine, thereby reducing the shock or jar incidental to the final stopping operation. to a minimum.

In the accompanying drawings, Figures. 1

' and 2 are opposite side elevations of a buttonhoie-stitching machine embodying the present invention. Figs. 3 and 4 are rear end elevations of the machine, Fig. 4 being partly in section, so as to show some parts which are hidden in l ig. 3. Fig. 5 is a bottom view of the machine shown in the other figures.

Referring to the drawings, 12 denotes the work-plate, 13 the arm of the machine, and 14 the main shaft ournalcd in the upper part of said arm and provided at its rear end with the fast and loose pull 15 16. The of the machine is of an old and well-kl'iowi i character and comprises the needle 1'" bar 13, having a crank and pitman connec tion (not shown) with the forward end of the main shaft 14, so as to reciprocate vertically in a horizontally-swingii1g frame or gate 19, said needle cooperating in the usual manner -with'an oscillating shuttle working in the shuttle-race and operated from a crank 21 at the lower end of the vertical shaft 22, geared I, carried by the nccdlcchine to be connected with swinging needle-bar frame or gate 19 for the I purpose of making overseaming or overedge stitches and also includes a buttonhole-cutting mechanism and. a work-clamp; but as these and some-other features of this machine are not herein claimed, but are included in the joint application of myself and William E. Goodyear, filed January 8, 1906, Serial No. 295,077, ohly so much of the present maas will be necessary to an understanding of the stop-motion mechanism thereof need be herein described.

.The feed-wheel which is connected with the work-clamp so as to impart proper feeding movements thereto, is intermittingly rotated by clutch-dogs 47, gripping the flange of said wheel in a well known manner, and operated bya rocking hub.48, having arm 49,:connected by a link with the slotted arm 51 of a bell-crank lever, the other arm 52 of which is forked to embrace an eccentric 53 on the vertical shaft- 22.

Adjacent to the fast and loose pulleys 15 and belt-shifter 134, carried by the stop-motion lever or stopping-lever 135, pivoted to swing in and out on a rocking .block 136, held in a hub 137 on a bracket 138, attachcrl to the arm 13 of the machine. Within the lever 135 is a vertically-movable plunger 139, yieldingly pressed upward by a setting and holding lever 141, the short upper arm of which is arranged to "engage the stop ping-lcvcr-135 to force the latter inward, as shown in Fig. 2, when the rod 142, attached to the longer arm of said lever and which is a suitable treadlc, is depressed. Beneath the bcd-plalc of the machine is a two-armed tripping-lever 1.43 144, the arm 143 of which is provided with a toepiccc to be engaged bythe tripping lug or projection 12() on the intermittmgly-rotati ng food-wheel 40 when the machine is to be slop'pC-d, the other arm 144 of said lever being held by the stress of the spring 145 in a notch 146 in the treadle-rod 142 to hold' the parts in the running position of the machine against the stress of the spring 147, serving to force the stopping-lever outward when the said u ring 140. 'Plvotcd in suitable cars m thcbrac 'et 1381s a 16 on the main 'or driving shaft 14 is a lever 143 144 is tripped by the lug or projection 120, and the arm 144 of said lever is the inner face of the fast pulley near the periphery of said face, said pad being forced [0 toward said pulley by a. spring 150, the stress .of which may be varied by the adjusting-pin 151 tapped in a lug 152 on the arm 13 and having a nut or collar against which said spring abuts. Fast on the main shaft 14 is a stopping cam or tap et 153, to be engaged y the plunger 137 W ten the machine is to be stopped, and pressing against the stoppingl-le-ver to soften the impact of the blow of t e stopping-tappet against the said pluner or to absorb a part of the shock of such low is a s ring-pressed cushioning-pin 154. The brake ever 148- is rovided with an arm 155, extending behind t 1e stopping-lever 1 35, so that when said lever is forced inward to the position shown in Figs. 1 and 2 and the parts are in the running )osition of the machine the said lever wil hold the frictionpad 149 away from the face of the fast puley; but when the stopping-lever is moved outward to stop )ing position said pad will be pressed by the spring 150 against said pulley to arrest its movement. As the stopping-lever will be tripped in stopping the machine nearly a full revolution of the main shaft before the tappct 153 strikes the plunger 137, the speed of rotation of the shaft 14 will be so slackencd or reduced by the friction-pad 149 by the time the final stop is to, occur that the jar or impact .will be softened to any desired degree, depending on the adjustment of said spring, and such adjustment of said spring may be made that the final blow or shock in stopping will be hardly perceptible.

The stop-motion device may be tripped manually by a latcrallyanovable push-button 163, conncctcd by a link 1'64 \Yilll the.

arm 144 of the holding and tripping lever.

Having thus described my invention, 1 claim and desire to secure by Letters Patent- 1. .ln a stop-action device, the combination with a rotary shaft having fast and loose prllcys thereon, of a hclt-shiftcr,- holding m ans for retaining said bclt-shiftcr in position so that the driving-belt will 1'; n on said.

fast pulley, anion atic 1 cans for tripping the said holding :1 cans and for moving said beltshifter, to transfer the driving-belt from said fast pnllcy to said loose ]).1llt a positive stopping device for said shaft, and a fricl ionpad which is operated illtlt)(1l(ltllil of the said positive stopping device and which is. released when the said belt-shifter is iovcd to transfer the said driving-belt to said loose pulley, the said friction-pad being ar ranged that when tlnas released it xvii! bi forced against said fast pulley to arrest or retard the rotation thereof before the said positive. stopping device comes into operation, so as to soften the jar or shock of the final stop.

2. In a stop-notion device, the co.'nbina-' tion with arota'ry shaft having fast and loose pulleys thereon, of a belt-shifter, holding nteans for retaining said belt-shifter in such position that the driving-belt will run on said fast. pulley, automatic means for tripping said holding means and for nzoving said beltshifter, to transfer the driving-belt from said fast pulley to said loose pulley, a positive stopping device for said shaft comprising-a stoppingdever, a friction-pad which is operated independently of the said stopping-lever and which is. released when the said belt-' shifter is moved to transfer said driving-belt to said loose pulley, a spring which serves to force said friction-pad against said fast ptlley, and adjusting means for varyingthe stress of said spring to cause more or less arresting or retarding action to be exerted by said friction-pad before the said positive stopping device conxes into operation; where-- by the jar or shock of the final stop may be softened to any desired degree.

3. A stop-motion device comprising a driven shaft, a positive stopping device therefor, an independently-mountcd and independently-operated arresting or retarding device for said shaft, and (Oalil Ull means for tripping said arresting or retarding and positive stopping devices into action to effect their successive operation upon the driven shaft.

4. A stop-motion device comprising a .drivenshaft, a positive stopping device therefor, an indepcndentlymaounted and independently-operated arresting or retarding device for said shaft, commonmeans for trip-. ping said arresting or retarding and positive stopping devices into action to effect their successive operation upon the driven shaft, and a cushioning device for the said positive stopping device.

A stop-notion device comprising the combination with a driven shaft and a wheel or pulley fixed thereto, of a positive stopping device for said shaft c-oirprising a stoppinglevcr, an arresting or-retarding device separate from and operated, for its retarding function, imlqicndrntlv of said stopping-lever and consisting of a spring-pressed pad arrangcd to press against said wheel or pnlhvv. andcoon on n cans for bringing said arr:- ing or retarding and positive stopping devices into action to effect their snccessivc operation ..pon the said driven shaft.

0. A stop-n otion device comprising the conibination with a driven shaft and a wheel or pulley fixed thereto, of a positive stopping rate from andoperated, for its retarding upon the said driven shaft, and cushioning :0 means for the said stopping-lever.

In testimony whereof I aflix my signature in presence of twowitnesses.

EDWARD ALLEN.

device for said shaft comprising a stopping lever, an arresting or',retarding device sepa- Witnesses:

HENRY A. KORNEMANN,

' H NRY J. MILLER.

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