US191186A - Improvement in knitting-machines - Google Patents

Description

J. SIBSON.

KNITTING-MACHINE. No. 191,186. Patienten?. May 22,1877.

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Be it known that ,5I J ofsEiH gSIBsoN. of. Philadelphia, Pennsylvania, "have inventedy certain Improvements in Knitting-Machines, of which the following is aA specification The object of my invention is to accurately adjust the movement of the guide-bar in a knitting-frame by means of a pattern-chain and other mechanism of the peculiar construction fully described hereafter, the devices being such as to produce a greater variety of patterns on the knitted fabric than can be attained by the aid of the ordinary patternwheel.

In the accompanying drawing, Figure 1 is a side view, partly in section, of my improved pattern-chain and mechanism connected therewith Fig. 2, a plan view of Fig. l, and Figs. 3 and 4 detached views of the chain.

The ordinary guide-bar of a knitting-frame is connected to the yoke A, so secured to the arm b of a lever, B, as to be adjustable thereon, the movement of the bar in one direction being determined by projecting ribs on the links of the pattern-chain D, and in thefoppo site direction by any suitable spring' which will cause the roller aJ on the short arm b of the lever B to bear on the said vprojecting ribs of the chain.

It is important, in knitting fan-cy work on straight frames, that the movement of the guide-bar should admit of nice adjustment, and that movement should be free from all irregularities, such as would result from the employment of the ordinary pattern-chains used in connection with Weaving-looms 5 hence I prefer to employ a chain of the character shown in the drawing. l

All the links proper of the chain are pre-Y cisely alike, and are madeas shown in Fig. 3-

that is, each link has a slot, x, at one end for receiving the projection y on the adjoining link, thereby forming with the coupling-pin a rule-joint.

Each link is adapted to the periphery of a drum,H, and has a recess,f, adapted to teeth on the said drum, which may be operated from a working part ofthe knitting-frame, through the medium ofinechanism similar to that used in connection with ordinary pattern-wheels.

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mi May 22,1-,irmf;{ appncatin niet g,whichbears on the surface of'fthedruin betweenfcthefteeth, and-'servesy to insure thegllirin foundation for the link necessary to adapt the chain to the purpose of imparting the delicate movements required by the guidebars of a knitting-machine.

Some ofthe links ofthe chain are plain, and others have projecting ribs l1., and the ribs of some of the links are more prominent than those of others; but Whatever may be the character of these ribs as regards prominence, they areinvariably arranged as shown in Fig. i-that is to say, each projecting rib is halved atand near each end,so as to beadapted to the halved ends of adjoining links, and the halved portions of the ribs bear the relation tothe joints of' the links shown by the radial dotted lines fw in Fig. l. By this mode of constructing the pattern-chain all such gaps in the chain as would impart an irregular or tremulons movement to the lever B are obviated.

The roller a being as Wide as, or wider than, the ribs, the action ot' the ribs on the links is as precise and determinate as the steps of a solid pattern-wheel.

As before remarked, the movement of the guide-bar of a knitting-frame, and especially of a frame for knitting fancy goods, must admit of being accurately adjusted.

For instance, the frame may be required to move at one time to the extent ol' live needles at each step of the pattern-chain, While another fabric may vdemand a lesser or greater movement. This adjustment, or, as I term it, the general adjustment, is readily accomplished by a change in the position ot' the yoke A onl the long. arm b of the lever B; but when the general adjustment has been made, there is a danger ot' the feed-bar overreaching or underreaching the proper termini of its movements, the result of which would be a defective fabric; hence there should be means of a nicer adjustment than that attained by altering the position of the yoke. This secondary and firm adjustment is effected in the following manner: The standards M, to which the shaft N, carrying the lever B, is hung, are adjustable on the fixed frame P, and the roller a is arranged to revolve in a carrier, Q, which is adapted to a On either side of the recess f is a surface,

slot in the short arm b of the lever B.

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the roller a and standards MImust result in an alteration in the movement of the guidebar of the knitting-frame. t

rEhe adjustment of the standards M and roller a should bear such a relation to each other that the roller a Will be directly over the center of the drum H, in order to insure its solid bearing upon the same.

The drum is constructed, in the present instance, for the reception of three patternchains, a similar number of levers, B, being also employed in practice, although only one is shown in the drawing, and any one ormore of the three chains can be made to control the guide-bars.

xIt will be evident, however, that more or ylessy than three chains may be employed, and

that the ,more chains there are, the greater Willvbe the'capacity of the frame for producing a variety of patterns.

AI claim as my invention- 1. The combination of the pattern-chain with a lever, B, and adjustable yoke A, attached to the guidebar of a knitting-frame.

2. The combination of the drum H, the pattern-chain, and adjustable standards M, carrying the lever B. v

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

JOSEPH sIBSON.

Witnesses: l

l HENRY Ho'WSoN, Jr.,

1 HARRY SMITH.A

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