US2642135A - Cutting machine for synthetic silk and rayon yarns - Google Patents

Description

CUTTING MACHINE FOR SYNTHETIC SILK AND RAYON YARNS Filed Feb. 25. 1948 June 16, 1953 G. c. REGALIA 2 Sheets-Sheet l //AI m June 16, 1953 e. c. REGALIA 2,642,135

CUTTING MACHINE FOR SYNTHETIC S ILK AND RAYON YARNS Filed Feb. 25, 1948 2 Sheets-Sheet 2 to shaft I.

Patented June 16, 1953 CUTTING MACHINE FOR SYNTHETIC SILI AND RAYON YARNS Gian Carlo Regalia,-Milan, Italy 7 Application February 25, 1948, Serial No. 10,616 In Italy March 1946 g 1 section 1, Public Law 690, August 8, 1946 Patent expires March 5 1966 The present invention relates to a cutting machine for synthetic silk and rayon yarns for outting the latter in staple fibers of various lengths.

- Difiiculties arise from cutting synthetic silkand rayon yarns, which, as it is customary, are delivered from the spinneret in the form of a continuous filament, which however, to be woven and worked in the way of natural fibers, must be cut in staple fibers of various lengths, usually from three to twelve centimeters, according to the working and type of fabric for which they are to be employed.

The cutting machines heretofore known have knives that are lowered onto the tow of filaments, while the same travel and perform a rectilinear motion, whereby the fibers bend and unfavorably act on the knives, which must be honed after a few hours of work.

The cutting machine forming the subject mat ter of the present invention avoids the above disadvantages in as much as the cutting of the rayon or synthetic silk yarns is performed while same travel over a rotating drum on which are secured knives working in combination with clamping members that look the yarns or filaments in two zones around the drum, namely,

ahead and past of each knife, respectively so that clamping members and cutting members (knives) alternate and are positioned on both sides of the drum. Thus the above drawbacks are avoided and the life of the knife edges is considerably prolonged.

The accompanying drawings illustrate schematically and by way of example an embodiment 1 of the invention, in which:

Fig. 1 is a cross-sectional view of one half of the drum and members connected thereto, on

which are cut the synthetic yarns emerging from r a spinneret (not shown) Fig. 2 is a partial plan view of the drum of Fig. 1;

Fig. 3 is a vertical sectional view through the clamping means and blade means seen in Fig. 1.

Fig. 4 is a schematic layout of the drum proper showing the sequence of the different operations.

As is evident from the drawing, on rotating shaft I is mounted a drum 2 onwhich is wound the rope or tow of filaments emerging from the spinnerets.

Clamping and cutting members alternate with each other and extend from the two sides of the drum.

Drum 2 is supported by discs H and I2 keyed Laterally to drum Zover which passes theyarn, are pivotally mounted on supports 9 2 Claims. (01. 164-42) which are attached at one side of drum-2, knives 3 which may rotate about pivots=5' adapted to be inserted between two compression and clamping members 4', which in turn are also pivotally mounted on supports in at pivots '5, on the other side of the drum. Knives Band members 4 are respectively mounted on the two sides of the drum all along the periphery thereof.

The cutting operation of the yarn is performed as follows:

Filaments F (see Fig. 4), just a little after having made contact with the outer surface of drum 2, are clamped thereon at location A, by the lowering of one of members 4, which exerts a clamping action to be completed when threads F reach location B, whereupon knife 3 begins to lower and at location C comes in contact with the filaments, under which is positioned a stationary blade 6. Thus the cutting is performed by knives 3 and relative to blades 6 in a very accurate manner and similar to the action of a pair of scissors and is ended at D, whereupon the clamping members i are lifted, so that at E. the staplefibers are set free and drop in a bin or vat wherein they are subjected to a cleansing bath and other surface treatments.

As indicated in Fig. 1 each arm 3 or 4'is operatively connected with a toothed sector IE or I6 engaging with a corresponding rack [5, I6, re-

spectively, to thereby perform a reciprocal horizontal motion. This motion is due ;to the fact that small, rollers ll, l3 are, respectively, connected to corresponding arms I7, 'I 8' carrying the racks l5, i6. The rollers are engaged in preshaped slots [9, 28 provided on respective sta tionary rings [8, 20 so that these rollers l1, [8 during rotation of the drum and in accordance with the formation of the slots perform movements causing the corresponding racks to rotate the sectors l5, |6 along an arch around-the corresponding pivots 5, 5' whereby the clamping and cutting means 4!, 3 are actuated about said pivots 5, 5' to thereby rise and descend alternately with respect to the drum 2 and stationary blade 6 fixed thereon.

As it appears from the above description, the peculiar-feature realized in the cutting machine according to the invention is that of applying the In the drawings are shown some mechanical and constructive details of the difierent parts constituting the above described machine which may vary according to necessities without therefore departing from the field of the present invention.

Having thus described the invention, what is claimed as new and desired to be secured by Letters Patent, is:

1. A cutting machine for synthetic silk and rayon yarns, filaments and textile fiber material comprising a rotatable drum having a peripheral surface for supportin said filaments, clamping means pivotally mounted on one side of said peripheral surface for movement toward and away from said surface, blade means pivotally mounted on the other side of said peripheral surface for movement toward and away from said surface, said clamping means alternating with said blade means about; the periphery of the drum, means extending laterally from each side of the drum surface toward the surface of the latter and operatively connected to said cutting and blade means respectively for operating them in sequence during rotation of the drum, whereby the cutting of said filaments is efiectuated to predetermined lengths while the same are held in taut and stretched condition by said clamping means.

2. A cutting machine according to claim 1, including stationary blade means positioned on the median portion of said drum and below said pivotally mounted blade means and cooperable with the latter, whereby cutting of the filaments is performed in scissor-fashion.

GIAN CARLO REGALIA.

References Cited in the file of this patent UNITED STATES PATENTS Germany June 27, 1913

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