US2378946A - Sinker - Google Patents

Description

June 26, 1945. c, PA E 2,378,946

SINKER Filed May 26, 1942 8g .9 Z. Page 26g 4 v attorney.

Patented June 26, 1 945 fsmxnn w c ne L. Page, Philadelphia, Pa.

ApplicationMay 2s, 1942,Serial No. 444,565

2 Claims. 'o1.,66- -7) The presentinvention relates to improvements insinkers and methods of operation.

In accordancewithpresent methods, in circular,

knitting'machines'the' stitch is drawn by the needle over-the regular stitchdrawing platform of 1' the sinker, following which the rear wall ofthe sinker throatipushes the stitch over the hook of the needle-without releasing the pressure on the yarn. Consequently when knitting a tight stitch and changing yarns the tendency is to cut the fabric due to the overlappingof the twoyarns making-a double thickness for thesi nkers to push against without any compensating relief; The

only alternative isto slackenthe stitch.

Another source of trouble results from the V- I shape formed bythe latch and the cheek of the needle at the lower part of the yarn eye. When the stitch is being drawn the regular. drawing platform of thesinker comes in contact with the stitch previously drawn on the needle. andcloses the latch before the needle is drawn low enough on the stitch cam for the yarn being fed into the needles to escape being trapped into V-formation of the yarn eye; especially on synthetic yarns,

the fibers often being pinched orcut and causing a frayed appearanceand weakening of the fabric.

The invention aims to eliminate these difliculties resulting in the production of a finer and smoother fabric which can be produced without the enumerated troubles. I

With the foregoing and other objects in view the invention will be more fully described hereinafter and more particularly pointed out in the appended claims.

In the drawing in which like partsare denoted by the same reference characters throughout the severalviews:

Figure l is a side elevational view of an improved sinker constructed in accordance with the present invention showing a fragment of a needle as having just drawn a stitch.

Figure 21s a similar view showing the subsequent positions of the sinker and needle with the yarn on the inclined wall of the sinker.

Figure 3 is a, similar view showing a third sequence position of the parts with the yarn on.

the resting platform,

Figure 4 is a similar view showing the yarn en- I gaged with the rear wall of the sinker throat.

Referring more particularly to the drawing l0 designates generally a sinker of a standard or conventional form in common use at the present time, modified for the purposes of the present invention, such modification consisting generally of a low stitch drawing platform ll, an inclined wall I 2 and a resting platform I3 which is, or may be, at generally the horizontal elevation of the standaid or conventional stitch drawing platform of the present day sinker. The throat of the improved sinker is indicated at I4 and its back wall atl5. W

The needle is. designatedgenerallyat l6 and the needle latch at H. ,Ir'rEigure l. the-.stitchis designated at!!! and in. Figures 2, 3 andA the same .isshown in. its subsequent positions at lag,

I8 andl8..

It will be seen that,according to the invention,

the stitch drawingplatform II is a l oW; platform compared to the regular orstandard stitch draw ing platform of conventional .sinkers fortthe: pure pose of drawing a shorterstitch l8. As an example, I cut this platform down fifteen thousandths of an inch from the height of the regular platform in a forty-eight gauge sinker and have secured excellent results, although I do not wish to be restricted to this precise figure. For a seventy gauge sinker ten thousandths of an inch cut down gives good results.

In operation, Figure 1 shows the full draw of V the needle as making a short stitch over the com paratively low stitch drawing platform H. As

the needle is being raised by the side cam and.

the second needle is drawing a stitch over the next sinker, the first sinker is moving forward, as indicated in Figure 2, to cause the rearwardly inaction takes up the slack caused by the rising needle, pushes the yarn to the back of. the needle hook and holds it in that position to prevent the second needle from robbing any of the slack yarn.

The continued forward motion of the sinker raises the stitch l8 to the level of the high resting platform l3 which position is shown in Figure 3. In this condition the pressure is released from the yarn and the stitchis allowed to equalize any undue stress put uponit between the needles and sinkers, and this condition exists until the rear wall l5 of the throat is moved forward to set the stitch on the needle.

Thus there is produced what may be termed a double pushing action developed by inclined wall l2 and rear wall l5 witha rest period between produced by the resting platform l3. This arrangement reduces to. a minimum the strain put upon the yarn when drawing the stitch. When the next course of stitches is drawn, the first course is pushed over the hook of the needle by the pressure exerted by the rearwardly inclined sinker wall [2, and when the hook of the needle is raised to the level of the high resting This needle by moving the rearwardly inclined sinker wall against the yarn; the third step to release the pressure when the stitch is raised to the level of, and enters upon, the high resting platform i3 of the throat; and the fourth step to set the stitch on the needle by movement of the rear wall I 5 against the same.

Only one sinker at a time pushes on the yarn after the stitch is drawn by the needle. The low stitch drawing platform ll allows the needle Hi to be drawn lower on the stitch cam before the latch is closed by the stitch on the needle, the yarn being fed higher in the yarn eye. This feature helps to preventtrappin-g of the yarn between the latch and cheek of the needle when the stitch is being drawn.

The invention involves a substantially horizontal stitch drawing platform on a lower plane than the resting platform of the throat disposed forwardly of a rearwardly-inclined wall extending upwardly from the stitch drawing platform to the resting platform, the resting platform also being horizontal and extending rearwardly from the apex of the rearwardly-inclined wall to the slightly rounded rear wall of the throat; the rear wall extending upwardly from the resting platform to the roof of the throat; and the throat 1 roof extending forwardly from the apex (top or highest point) of the rear Wall and rounded at the other end to formthe nose of the sinker.

What is claimed is:

1. An improved sinker comprising one of an identical complement of sinkers of which a sinkerring consists, said sinker having a drawing platform lower than standard positioned relatively to a needle to enable said needle to draw on said drawing platform a stitch shorter than standard, an' inclined wall extending upwardly from the rear edge of the low drawing platform, a high resting platform extendingrearwardly from the upper edge of the inclined wall, a throat, a rear throat wall, a throat roof, and a sinker nose, said resting platform being short in the direction of movement of the sinker, said rear wall being close to the rear end of said inclined Wall, said inclined wall being wholly within said, sinker nose.

2. A sinker comprising one of identical sinkers composing a sinker ring, each of said sinkers comprising a sinker nose having a rounded under forward portion, a horizontal throat roof, a vertical back wall, slightly rounded where it isjoined to the throat roof and the high resting platform, a high resting platform, a throat formed by the high resting platform, vertical back wall and throat roof, an inclined wall sloping gradually from the forwardedge of the short high resting platform down to a point lower than the customary drawing platform, both said high resting platform and said inclined wall being within the overhanging confines of said nose, and a low 7 drawing platform extending forwardly from the forward lower end of said inclined wall on which to draw a shortened stitch.

CHARLES L. PAGE.

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