US45059A - Improvement in sewing-machines - Google Patents

Description

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. B', which is connected to-the head C.

UNITED STATES PATENT EEicE.

NV. A. MACK, OF CLEVELAND. CHIC.

IMPROVEMENT IN SEWING-MACHINES.

Specification forming part of Letters Patent No. 45,059, dated November 15, 1864.

description of the construction and operation of the saine, reference being had to the accompanying drawings, making a part ot' this specitication, in which- Figure 1 is a side view ofthe machine. Fig.`

2 is a View ofthe under side. Fig. 3 is an end Figs. el, 5, 6, and 7 represent detached sections.

Like letters of reference denote like parts in the ditt'erent views.

My improvement relates to the manner of carrying the shuttle, in connection with the shuttle-race, to the construction ot the shuttle in relation to giving the desired tension to the lower thread, and also to the manner of giving tension tothe upper thread from the spool.

A is the platform or bed-plate of the inachine, near one end of which is the standard B, that curves round, forming a horizontal arm, rEhis head forms a case for thecrank-wheel C", ncedle-bar D, and pressure-bar E, as indicated by -the dotted lines in Fig.'3. rIhe crank-Wheel C is securedto the end of the shaft that extends through Ithe arm B', and is connected with the driving-wheelaC", which operates the -needle-bar, there being a wrist, c, on the crank-4 On the under side of the bed-plate F is theprimary, and G the secondary, feed-wheels on the shaft G', one end'of which is supported by an arm, f, secured to the bed-plate, and 'theend on which is the primary feed-wheel rests in an adjustable bearing, g, which is secured in place by a screw, g', in a slot of an arm. or

` lug,j", fastened to the bed-plate,

His a vibrating arm or lever pivoted at HQ. The 'end I holds the shuttle, and the other end is inserted in a hole in the head ot' the socket or thimble H'", Fig. 1. This socket receives the pendent end of the lever u, which. vibrates upon the stud u by the action ot' the cam 'v upon the driving-shaft; The upper end, wf, of the lever is forked, so as to receive the cam between the forks. The vibration ot' the lever u is transmitted to the larm H by its con nection. As the lever u tits" loosely in the socket, so that the socket may turn, and also slide up and down on the end ot' the leverar, forming a compensating-joint, this allows the leveru and arm H to be readily adjusted to each other in thc various positions assumed when in operation. The shuttle end ot' the arm H branches out, and is formed into a head or holde1,l,in which the shuttle H rests, and is carried back and forth. (Represented in Figs. 2, 4, and 5.) Fig. 4 is a view at the end of the bed-plate underneath the `needle and pressure bars, with the adjustable plates A removed, showing the top of the shuttle as it is held in the holder close to the shuttle-race J. (Represented also in Fig. 5.)

lhe holder is formed with end pieces,ft' t', between which is an inclined plane, (indicated by the dotted line L in Fig. 5,) on which the shuttle rests, that,together with the end pieces and in connection with the shuttle-race .lbkeeps the shuttle from tnovingr in the holder and retains it in the required position as it is being operated. i

The shuttle-raced consists ot` a polished rnetallic piece, forming the segment-.of a circle, the face of which is at right angles to the plane of the vibrating arni, vertical on both sides, and extends up close to the plates A. inside of the feed-wheel F, with a needle-slot, d, through the center, the ends being secured to'lugs lf* onthe bed-plate. rlhe shuttle is so formed that it fits close to the race J trom the heel to the peint the whole' length ot' its movement, and as it is stationary in the holder and its weight entirely supported by the vibrating arm, and" only one side moving against the race, very littlefriction is produced- Thisarrangement is in every way an' improvement over the man,- ner of vibrating the shuttle in my former patent, in whichthe shuttle is moved bach and fortlrin an angular trough, forming the shut` tlc-race. The shuttle thus moving produces friction'l and wears it away on theroutside, and its surface is apt to be roughened by its weight resting and rubbing on lthe angular trough, which is liable to chai'e and cut the thread in forming the stitch. The trough admits ot' an accumulation of dust and dirt, causing the machine to operate with less facility, and it cannot be so easily cleaned, nor the shuttle taken out and put in, as readily as with my improvement.

The shuttle is differently constructed in regard to adjusting the tension ot' the thread. ln place ot' a rib upon the upper margin, with holes through which the thread is laced, there is an adjustable spring. u, (seen in Figs. 4 and 6,) along the top ot' the shuttle close to the shuttle-race, one end ot' which is put through nn opening or hole, o, in the shuttle, andthe other end is fastened in at the heel erd ofthe shuttle by the screw N, which has a groove, n', round the shoulder, into which the end of the spring passes as the heel ot the shuttle is closed by the screw shown in Fig. (i, which is a section ofthe shuttle. The spring is'thus retained in place on the shuttle with hot-h ends i'ree, giving elasticity to, the spring, and by means ot" which it can be adjusted. The screw N forms a bearing for one end of the bobbin L, the other end turning in the solid end of the shuttle, as represented. Thepthread from the bobbin passes through an opening, 1, in the shuttle alongside or under the spring, through holes in the spring, as in Figs. 4 and 6, the thread being laced through two or more holes, as may be required to produce thedesired tension. As the spring is notrigidly fastened at either end, it yields readily to the unevenness of' the thread, producing a most even and unii'orm tension, and it is likewise perfectly adapted to dii'terentsized threads, coarse or iine, without any change ot' setting.

'lhe tension ot' the upper thread from the spool in connection with the needleis regulated by a spring, M, arranged above the arm B about the middle, secured to the bracket m by a screw, m. A perspective view of this spring isisecn in Fig. 7, representing a tiat piece bent together at the two ends, forming a tlat point, p, and it is kept iu that .form on the bracket m by the screw m.

Near the point, through the upper part of the piece forming the spring, is a hole, 1', through which the thread from the spool Q is put and passed between the ends forming the point of the spring, as indicated by the red line p', and by which the thread is regulated, as it is drawn from lthe spool, in the most uniform manner, and from theelasticity of the spring i t is equally well adapted to various-sized threads, so that the thread may be changed withoutremoving the screw and changing the spring, the same spring as adjusted being perfectly adapted to give the desired tension to any sized thread. The thread extends through the guide q and through the top ot' the needlebar down through the guide t and spring t on the outside ofthe headC. as noted by the lred line in Fig. 3, the spring t taking up the loose thread from'the needle.. These devices altogether, n1 giving tension to the thread and taking up the loose thread from the needle, regulate the thread in the most uniform and perfect manner.

What I claim as my improvement, and desire to secure by Letters Patent, is-

1. The arrangement ot' the shuttle-holder I, race J', and shuttle 1I', in combination with the vibrating arm H', socket H", lever u, and cam c, constructed and operating as and for the purpose set forth.

2. The vspring fn, in combination with the screw N and shuttle, as and for the .purpose described.

W'. A. MACK.

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