Patent GB-563983-A (GB)
Title: Improvements in machines for cutting continuous filamentary material into staple fibres
IPC: D01G1/04
Filed: 1943-04-12
Abstract: 563,983. Stapling continuous filaments. AMERICAN VISCOSE CORPORATION. April 12, 1943, No. 5811. Convention date, April 30, 1942. [Class 120 (iii)] In an apparatus for cutting continuous filaments into staple fibres, alternate cuts are directed into separate discharge channels ; successive cuts may give fibres of differing lengths, each alternate cut of the same length being directed into the same separate discharge channel or the fibres of individual alternate cuts may vary in length, the alternate cuts of the same variation in cut being directed into the same separate discharge channel. As shown, the filaments are delivered to the axial channel 8 of a rotary disc 2 and expelled from the radial channel 9 thereof by centrifugal force, supplemented, if desired, by a fluid blast. A cutting knife 14, with a wavy or serrated edge co-operating with a complementary-waved or serrated portion 26 of the disc, is mounted on a standard 12 at one side of the apparatus and a pair of overlappng rotary cutting, discs 16, 17 are mounted at the other side of the apparatus on a standard 13 which is adjustable around the periphery of the disc by means of a foot carrying bolts 24 engaging an arcuate slot 25 on the base 5 of the apparatus to vary the length of the fibres cut ; the standard 12 may also be adjustable. Each clump of fibres cut has a wavy or serrated cut at one end and a straight cut at the other, and the alternate clumps are directed into the separate ducts 21, 22 and contain a mixture of fibres of various lengths regularly or irregularly staggered at one end. The portion 26 may be a cylindrical, frusto-conical or a segment of a spherical surface and the waves or serrations may be of varying amplitude and pitch and regular or irregular. More than two cutting elements with a corresponding number of discharge ducts may be arranged around the periphery of the disc 2. In a modification, the radial discharge channel of the disc is formed in a guide oscillatably mounted in a transverse slot in the disc and carrying an internal rotatable sleeve through which the filaments are delivered to the cutter and which has a ring gear engaging an annular gear rack on the sloped bottom of the hub of the disc ; the transverse slot in the disc converges towards the centre thereof and by varying the gear ratios of the ring gear and rack any twist may be removed from the filament being cut or any desired twist may be put therein. In another form, the periphery of the disc is shaped to conform with shaped cutters and pivoted deflecting members, extending about a portion of the periphery of the disc, force the filaments into position to be cut at one or other of the shaped portions of the disc. In the form shown in Fig. 8, a sheet of filaments is fed at an adjustable rate by rolls 51 into the path of a pair of cutters 52, 53 driven by gearing and each carrying a number of blades 57 having straight, curved, wavy or serrated edges and which cut the sheet alternately at opposite angles and produce mixtures of various fibre lengths which are delivered into two separate receptacles 59, a member 60 pivoted along the line of division between the two receptacles being rocked from a crank disc 62 to deflect the cut fibres of each alternate cut into a separate receptacle. Specification 560,670 is referred to.