US1596527A - Machine for making knitted pile fabrics - Google Patents

Description

Aug. 17 1926.

, A. A. GRUNDY MACHINE FOR MAKING KNITTED FILE FABRICS Filed March 27. 1925 2 Sheets-Sheet 1 m /G.3. -7,/ I M/VEA/TUR W/r/w'ss: j/ G /y v (KIM. r P w @L fi A. A. GRUNDY 1 MACHINE FOR MAKING KNITTED FILE FABRICS Aug. 17 1926 Filed March 27, 1925 2 Sheets-'Shet 2 R m m w re0/ Grant/y BY fl M W WITN SS. 4;: ,4145'0 Patented Aug. 17,1926.

UNITED. STATES ATENT OFFICE.

ALFRED A. GRUNDY, or PHILADELPHIA, PENNSYLVANIA, ASSIGNOB or ONn-THIRD T0 sAID ALFRED A. GRUNDY, ONE-THIRD TO GEORGE GRUsHLAW, AND ONE- THIRD T0 JOHN SICI-IEL, ALL or PHILADELPHIA, rENNsYLvANIA.

MACHINE FOR MAKING KNITTED PILE FABRICS.

Application filed. March 27, 1925. Serial No. 18,664.

The object of this invention is to produce a knit pile fabric. T

In a patent issued to me November 5, 1925, No. 1,560,229, I describe and claim a machine adapted to knit such a fabric. It comprises needles and yarn-holding bars adapted to cooperate to form elongated loops engaging the bars and a bite roller adapted to roll over the bars and press the yarn between it and the bars and thus sever the yarn.

More specifically, this machine is of the circular type and comprises a bank of vertically extending and reciprocating cylinder needles, a bank of dial bars or dummy needles extending and reciprocating radially, and two yarn feeds, oneabove, and the other below, the plane of the radial bars. The vertical cylinder needles and radial dial bars are operated in the same way that the vertical needles and dial needles of a rib knitting machine are operated. T/Vhen so operated, the yarn fed to the needles from' beneath the bars is knit by the vertical needles into a plain web, which the yarn fed to the-needles from above the bars is engaged thereby to form elongated loops. The needles operate to draw both yarns through the loops formed by the first yarn,but are restrained by the barsfrom drawing yarn through the loops formed by the second yarn. There are thus formed fromthe first yarn normal, interconnected loops producing a plain web and long floating loops that are looped over the bars, and which, as above stated, are severed by the bite-roller that rolls over the bars.

The present invention is a modification of this machine whereby after a course of knitting is formed comprising normally, interconnected loops formed'by oneyarn and long floating loops formed by the other yarn, another course of knitting is formed comprising normally interconnected, tightly drawn or practically closed loops; these courses alternating throughout the fabric. Thereby is produced a fabric in which, after the long loops are out, the pile threads will be very firmly bound and held in the fabric.

In the drawings which show a preferred embodiment of the invention:

Fig. l is a plan viewof the dial cam plate, the actuating cams for the dial bars, the yarn carriers and the loop cutting rollers;

certain of the vertical needles being also shown diagrammatically, in side view, to indicate the approximate points at which the stitches are formed relative to the operation of the other mechanism.

Fig. 2 is an enlarged plan View of part of the machine shown in Fig. 1.

Fig. 3 is a front View of part of Fig. 2.

Figs. a and 5 are radial cross-sections through the cylinder and the dial on the lines 4.4 and 55 of Fig. 1.

Fig. 6 is a diagram of the fabric.

a, a are the vertical cylinder needles, similar to those of a rib knitting machine and are reciprocable in the usual .way by knitting cams (not shown).

Z), 6 are bars corresponding to the radial or dial needles of such a machine and are similarly associated with the cylinder needles and are reciprocable radially by cams 0, (Z, c, f, g, 72,. 2', j and 7: represent yarn feeds or guides. livers yarn y from below the plane of the dial bars. Another feed, 7', delivers pile yarn w from above the plane of the dial bars.- The remaining feed, 70, delivers binder yarn z from above the plane of the dial bars.

The machine is one in which the needleactuating cams and bar-actuating cams are stationary and the needles and bars rotate (although a reverse arrangement will be understood to be the full equivalent).

Assuming that certain dial bars I) are re-' One of these feeds 2', de-

At this time the needles are by means of a screw 4).

Fig. The needles engage both yarns simultaneously and form plain loops, but in the projection of the dial bars 7), the yarn a; delivered from above the plane of the dial bars is laid over these bars, and therefore their yoke portions do not engage the necks of the loops of the adjacent course and do not unite adjacent courses of knitting. In Fig. 1 the letter Z) is applied to dotted lines indicating the positions of the outer ends of projected dial bars.

As the needles and bars continue to travel, cam (Z retracts the dial bars (see Fig. 5) but the projections b on the ends of the bars prevent the loops formed by yarn or from slipping off the ends of the bars. The needles move down and the bars are retract-ed, and the loops are hence elongated, as shown in Fig. 5.

As the needles and dial bars continue to advance, the bars are moved out by cam The needles now move up and the bars are moved in (by cam 7) and the needles moved down. In the downward movement of the needles, binder yarn 2 is fed to the needles by feed 76. After the needles complete the1r downward movement, the bars are moved out by cam g. The bars are extended beyond the edge of the dial on and the loops formed by the yarn as are nearly in alignment with the outer edge of the dial, while the knitting fabric moves down between the periphery of the dial and the inside of the needle cylinder 07., (See Fig. 4);

At the point of severance of the yarn 0c, the stationary overlyingcamgplate 0 is cut away to accommodate a roller 29, turnable 1n roller hearings, on a shaft carried on a member r, 'slidable in a frame a secured. to the dial plate 0. A coil string t is confined between member 1" and a disc at adjustable The pile-severing mechanism is the same as in my said. prior application.

As the dial bars continue to travel, roller 79 rolls over their upper surfaces and bites and severe all the loops successively.

To afford a support for the overhanging ends of the dial bars, there is secured to a fixed part of the machine, as in my'said prior application, a bracket 10, on which is mounted a roller 11, whose periphery extends underneath the outer ends of the dial bars and affords a supporting surface over which each bar rolls as it is being subjected to the downward pressure of the bite roller p.

As the needles and bars continue to advance, cam h retracts the bars 6, thus completing the cycle of operations.

In Fig. 6 is shown a diagram of a small section of fabric including several wales and several courses. The last knit course of loops formed by the yarn a: is shown pulled taut over the bars 1) before they are cut by the bite roller 39. The preceding courses containing yarn or are shown with the yarn 00 severed to form the upstanding pile.

It will be observed that the fabric comprises, in accordance wit-h the foregoing description, alternating courses, one comprising normal loops formed by the yarn e, and the other comprising normal loops formed by the yarn 3 and elongated loops formed by the yarn m. 'It will also be observed that the normal loops binding in the pile threads are drawn comparatively tightly so as to securely hold the pile threads from pulling out. It should be understood that the drawing, Fig. 6, is a diagram and (in order that the structure may be understood) the openness of the fabric is greatly exaggerated.- In fact the fabric is a closely knit one, the loops holding in the pile threads 'being closed tightly.

WVhat I claim and desire to protect by Letters Patent is:

1. In a knitting machine, the combination with needles, of means to feed two yarns preparatory to knitting a course, loop-elongating means adapted to engage one yarn, means beyond the first means to feed a single yarn preparatoryrto knitting an adjacent course of yarn to engage the loops thereof with the necks of the loops of the yarn of the first course, and a loop-severing device beyond the second yarn feeding means.

2. In a knitting machine, the combination with needles and bars reciprocable. at an angle to each other, of cams adapted to project the bars, a pair of yarn feeds adapted to feed yarn tothe needles preparatory toknitting a course, the bars being adapted to engage one of said yarns and holdand elongate the loops thereof, a third yarn Tfeed beyond the first two yarn feeds adapted to feed yarnto the needles preparatory to knitt-mg a second course while the bars still hold the loops formed thereon, and a yarnsevering device adapted to sever the loops held on said bars after the second course is knitted.

3. In a knitting machine, the combination with needles and bars reciprocable at an an gle to each other, of cams adapted to project and retract the bars, a pair of yarn feeds adapted to feed yarns to the needles, preparatory to knitting a, course, the bars. being adapted to engage one of said yarns and hold and elongate the loops thereof, projections on the ends of the bars preventing the loops from slipping off after the bars are retracted, a third yarn feed adapted to feed yarn to the needles preparatory to knitting a second course, and a yarn-severing device beyond the third yarn feed' 1zgdapted to-sever the loops still held on the are. 1

4 In a knitting machine, the combina:

tion with bars and needles reciproeable at preparatory to knitting a second course, a an angle to each other, of earns adapted to cam adapted to again project the bars and project and retractthe bars, a pair of yarn a yarn-severing device adapted to sever the feeds adapted to feed yarns to the needles loops still held on the bars.

5 preparatory to knitting a course, the bars In testimony ofwhich invention, I have 15 being adapted to engage one of said yarns hereunto set my hand, at Philadelphia, and hold and elongate the loops thereof, Pennsylvania, on "this 25th day of March, cams beyond the first named cams adapted 1925. to project and retract the bars, a third yarn 10 feed adapted to feed yarn to the needles ALFRED A. GRUNDY.

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