US130005A - Improvement-in sewing - Google Patents

Description

2 Sheets-Sh33H G. W. BAKER.

Sewing-Machine.

Patented July 30,1872,

U M M/M/ GEORGE W. BAKER, OF CLEVELAND, OHIO, ASSIGNOR TC WILSONSEWING- MACHINE COMPANY AND WHITE MANUFACTURING COMPANY, OF SAME PLACE.

IMPROVEMENT l hi @Ehllihlfi hdthitiitlES.

Specification forming part of Letters Patent No. lltql fibfiltfi, dated July 30, 1872.

To whom it may concern:

Be it known that I, GEORGE W. BAKER, of Cleveland, Cuyaltoga county, Ohio, have inyrented certain new and useful Improvements g in Sewing-Machines, of which the followingis a specification: This invention consists of certain improvements in the tension, take-up, feed mechan ism, shuttle-race, ahd mechanism for driving the needle-arm and shuttle, which will be described in the ord named.

In the accompai ying drawing, Figure 1 is a perspective view of a machine made. in ac eordance with my invention. Fig. 2 is a plan of. the under side of the same. Fig. 3 is a view of the shuttle-race detached. Fig. 4 is a like view of the shuttle carrier or driver. Fig. 5isa front view of the head of the goose neck with the face-plate removed. Fig. 6 is an elevation of the machine. Fig. 7 is a vertical section of a portion of the cloth-plate, through the feed, and in a plane in the line of feed. Fig. Sis a plan view of the tensionspring detached The improvement in the tension relates to the pressure-spring. In lieu of using aspiral,

, volute, or other ordinary form of spring, I employ a disk, A, Figs. 1, 5, 8, made of spring metal, with a hole, a, in its center for the pas-- sage of the'screw-stem b of the tension, and with long spring-fingers 0, formed by cutting in the disk eecentric slits or slots, extending from the exterior of the disk toward the central hole a. These fingers are bent down so that when the spring is in place their tips will rest on the tension, as shown in Figtmfia.

The form of these fingers may be somewhat varied; but, as seen in the drawing, they .should all start from near the central opening a, and then follow a curved path, so as to obtain considerable length, in order to. have the necessary spring action without making the 'device too large. They should preferably taper toward their outer ends. A spring thus made possesses considerable advantages. It

i is very compact and admits of the pressure beingevenly applied. As the adjusting-nut cl bears upon the spring at a point within the compass of the spring-fingers, the latter, at

the points where they bear upon the tension, are enabled to operate equally and to the best advantage. I prefer to interpose a cloth,,rub' her, or other suitable washer, a, between the 'sprin g and the tension sheave or plate, although this washer is not indispensable.

The -improvement in the take-up consists principally in the instrumentalities for holdin g and adjusting it in order to take up more or less slack thread, as required for thin or thick goods. The devices are shown clearly in Figs. 1 and 5. They are for the greater part inclosed within the head B of the ma chine-the only parts projecting being the end of the take-up lever and the adjusting and holding nut. The take-up lever consists of an angle or bell-crank lever, C, the longer arm of which, provided at the end wit-l1 a thread-eye, partly projects from the side of the head, andis arranged to work up and down in a vertical slot formed in the same. The shorter arm of the lever is connected with the reciprocating needle-bar D by a link, f, by means of which connection the proper movements of the take-up at the proper times are imparted from the needie-bar. The takeup lever, at its angle, is pivoted to a block, g, the face of which is held tightly against the inner face of the side of the head B by means of a nut, h, screwing from the outside of the head .onto a screwstem, *5, attached to the block, and projecting through the head. To allow the adjustment of the take-up so as to adapt it to draw up moreor lessthread, as desired, a vertical slot, j, is formed in the head B, through which the lstemamasses, and the hlopk ncam by loosening the nut h, be adj nsted up or down to any point within the limits determined by the length of the slot, and can there be held by tightening up the nut. Raising the block in creases the length of movement of the takeup; lowering it decreases the range of movement.

.This arrangement is compact and simple; all the parts of ,the take-up, excepting only those actually required to be exposed, are concealed, and the samedevice serves not only to support and hold, but also to adjust the takeup lever.

The needle-barl) plays up and down through spirally-slotted bushings k at thctop anti not tom of the head B. These bushings, which are both removable and adjustable, are insertegi in cylindrical openings in the head, and are combined with set-screws k in ihe'face-plate of the head, which are arranged to have their points in contact with thebnshings. .ihe slots L which split or divide the bushings on one side, extend from top to bottom of the same, and instead of being vertical are inclined. or pursues spiral course partly around; the hush ings. The' object of the bushings is to prevent the needle-bar from wearing the hole in the head through which it passes, and,owing to the slots k, if cit-her the needle-bar or the bushings wear, the screws is can be set up so as to compress the bushings, bringing the edges of the slots closer together, and thus tighten the bushings so as to take up all wear. Byniaking the slots of the bushings spiral there is no danger of raising afin or rib on the needle-bar, which is liable to occur when the slots are made straight up and down.

it has been my object in thcfeed mechanism to simplify it and to employ as few parts as possible. It consists of a feed-bar, l, to which the feed-surface l is attache-(l. The arrangementfoi' thi s bar isshownin Fig.7, It is held to the underside of the cloth-plate by a yoke or strap, i at one end, while the feed-surface at the other end is in a recess formed for itin the topoigthc cloth-plate. A spring, in, is cmployed to givethebaclr and-down motionsto the feed. An adiusting-screw, 12,011 the end oft-he fceil-bor'serves to regulate thcextentto which the spring shall retract the bar, tliusilctcrmin ing the length of the feed. The up movement of the feed, to project the feed-surface above the clothplate, is caused by the rod E which is connected by a strap with the eccitric F on the driving-shaft G, and has its 0 or end supported in a ,rockeohearing, B, through, which it freely shoes. The eccentric revolves in thedirccticn indicated by arrow in Fig. 6, and when its most eccentric portion is above the shaft, in the position it occupies when the feed is just about to move forward, the connecting-rod E will be drawn up toward the clothplate, so as to press upward on the feedoar and force the fcelisurlace above the cloth. This pressure of the rod upon the bar continues until the feed has taken place, at which time the most eccentric portion of the eccentric begins to come below the shaft G, and the rod E,

' is consequently lowered, so as to permit the spring m to ilraw down the feed-sufl'ace. The forward movement of the feed is efi'ecteii by a link, I, jointed to a sleeve, I, fixed on the conneciing roil, (which sleeve is the part of the rod that bears on the feeriha-r to move it upward,) and provided at its outer end. with a slot, p, in which is received. a pin, 0, on the feed-bar. The-forward movement of the rorlv E will cause the link to advance, and the end. of the slot p nearest the connectin -roil is. brought, sooner or later, iul contoct with the pin 0, according to the adjustment of the nut 12. If the nut is ailjustc l for a long feed, the link operates upon the pin sooner than it would in case the adjustment were for a short feed. In lieu of casting the shuttlemace and of fermanently uniting it with the under side of the clothplates, I strike it up out of metal, as shownat J, Fig. 3, with a flange, r, to attach it to the cloth-plate, slotted atr for the possage of the feed-bar, a concave portion, s, to

receive the shuttle and shuttle-driver, and a slot, t, so that it may be always kept free of dirt and refose,= which can escape at once through the slot. The holes 0", through which the holding-screws 8 pass, are elongatcd,so-

as to permit the adjustment lengthwise of the race whenever desired. At the ends of the slot are fingers or projections t, which bear against the Way or ledge K on the under side of the bed-plate, this lodge closing the shuttic-race on the ilat side of the shuttle. The

race is set against the side oi one of the two ways K in which the shuttlecriver slide moves, and is there held by means of the screws 8', which pass through the flange 1" into the cloth-plate. The shuttle is shown at v, the shuttle-driver at c, and also separately in Fig. 4, and the shuttle-driver sli le at v. This slide is connected with an arm,'w on crankpin 10 of shaft G, by a rod, w. Of the two ways or grooved pieces K L, between'whicli the shuttle-driver slide r moves, the outer one L is removable and adjustable nearer to or further from the other, this being efi'ecteil' by providing it with cars as, slotted transverse- 1y to the length of the piece, through which holding-screws .r pass into the cloth-plate. By reason of this arrangement the piece L can be set up toward the other, K, so as to take up all wear and. cause the slide to move evenly and with out noise or lateral movement, while it admits also of the parts being taken apart to clean this portion of the machine with greater facility. The mech anism for driving the needle-arm consists of the crank-pin w fixed on a disk, 3/, attached. to shaft G, and the heart-shaped cam 2 formed in the lower end of the vertical portion of the angle-lever needle-arm 0, which arm is pivoted at its angle P to the standard of the machine. The

crank moves in the direction of the arrow,

and the arrangement of parts is such that the descent of the needle is efl'ected during that portion of the movement when the crank-pin is passing fromv the point 2' through the lower portion of. the cam-slot. The advantage of this arrangement is, that the descent of the needle to pierce the cloth takes place at a time when the operative length of the vertical arm of the lever U is continually increasing, so'

that the descent is slower and more gradual, and more power is obtained than would be the case were the shaft or crank to revolve in an opposite direction, and consequently the needle to descend when the operative ien'gth of the vertical arm of lever 0 was continually decreasing, for this would cause a more rapid,

tan ent 3 but propcrtionately less powerful, descent. arrangement sf the mechanism requires the shnttle a te be pointed outward or away from the driving-shaft G- instead of toward it, as has hitherto been the practice in the ma chine -the Wilson sewing-machine to which censisting of a disk with eccentricaily-curved and dewnwardiybent sprin g-fin gers, the Whole being constructed substantially as shown and described.

2. The take-up lever operated from the neediebar, as specified, and pivoted to a mowable block within the head of the machine, in cembination with a screwstem extending through a. vertical slot in thehead and an adjusting and chi-sapling net on theexterior of the head, under the arrangement shown and described, so that the said nut and stem may serve as a means both of moving the block up and down and oi ciamping it in position. a r

The slotted link, intermediate between and connected and operating in conjunction with the feed-bar, and the reciprocating rod E, substantially as shown and set forth.

,4. The shuttle-race, struck up from metal and formed, as herein described, with a concave bed to receive the shuttle, a holdingfiange slotted to permit the passage of the feedbar, and with elongated pin or screw holes to permit its being fastened to and adjusted lengthwise on the bed-plate of the machine, a slot for escape of refuse and dirt from the bed, and projections or bearings t, substantially as shown and described.

5. In combination with the needle-arm, its heart-sh aped cam groove or slot, and the crankpin of the driving-shaft; operating together as specified, so that the deseent of the needle takes place when the crank-pin traverses the lower portion of the slot, I claim an outwardly-pointed shuttle, arranged and operated from said crank-pin, substantially as herein shown and set forth.

In testimony whereof I have signed my name to this specification before two .sub-

scribing witnesses.

' GEORGE W. BAKER. Witnessesr A. ZEHRING, '1. B. LINDSAY.

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