Patent GB-749563-A (GB)
Title: Apparatus for the production of artificial filaments of varying denier
IPC: D01D5/20
Filed: 1953-12-17
Abstract: <PICT:0749563/IV(a)/1> <PICT:0749563/IV(a)/2> <PICT:0749563/IV(a)/3> <PICT:0749563/IV(a)/4> Apparatus for producing variations in denier in artificial filaments in response to the action of a rotary cam surface comprises a driven member connected to the cam surface, a driving member, and a connecting member between the driven and driving members adapted to rotate about the axes of these members and to oscillate relatively to one or both of the members so as to vary the speed ratio between them, whereby the cam surface is rotated at a continuously varying speed.  In an apparatus for spinning viscose rayon, a pump 13, Figs. 1 and 2, supplies spinning solution to a spinneret through a delivery passage 19 provided in a cylinder block 18 attached to the pump casing.  The passage 19 is intersected by a cylindrical bore 23 closed at one end by a screw plug 22.  A piston 24 is fitted within the bore 23 and is urged away from the passage 19 by a spring 27 provided between a head piece 25 of the piston and an extension 28 of the block 18, or alternatively between a wider portion 26 of the headpiece and the block 18.  A tappet member 32 is fixed to a shaft 31 and is provided with an adjustable tappet screw 36 bearing on the head 25.  The shaft 31 is freely mounted in a bearing 29 and has fixed thereto an arm 37 carrying a cam follower 38, the position of which along the arm 37 is adjustable.  The follower 38 engages a cam 39 provided with irregularly spaced points 41 so that rotation of the cam causes reciprocation of the piston 23 and provides alternately and in irregular arrangement slubs and portions of narrowed diameter in the spun yarn by variation of the pressure in the delivery passage 19.  The spinning pump 13 is driven by a shaft 11 through a connecting plate 48 from a gear wheel 47. The cam 39 is connected to a gear wheel 43.  Gear wheels 43 and 47 are freely mounted on a stub shaft 45 attached to the pump 13.  The gear wheel 47 is driven through a mechanism 68, 67, 66, 64, 62 from a shaft 61, Fig. 3, connected to a source of power, not shown.  The gear wheel 43 is also driven from the shaft 61 through gears 63, 69, a device for producing continuous variation of speed, 72, 73, so that the cam is rotated at a continuously varying rate so as to provide a high degree of irregularity in the spacing of the slubs, and gear train 75, 77, 78.  The device for continuously varying the speed of the cam 39 comprises two discs 72 and 73 mounted upon shafts 71 and 74, the axes of which are not co-linear.  A member 82 is arranged to slide in a radial slot 83 in the disc 73, and drive from the shaft 71 to the shaft 74 is transmitted by engagement of a peg 79 in a hole in the member 82. When the sliding block 82 is furthest from the axis of rotation of shaft 74 the rotational speed of shaft 74 will be at a minimum, and when nearest the axis of rotation will be at a maximum. The gears 75 provide a ratio between 3:4 and 4:3.  The gears 61 and 69 and mechanism 62, 64, 66 may be omitted and the shafts 67 and 71 may be driven from separate sources of power.  In a modification, Fig. 4, gear wheels 103 and 86 are mounted upon a stub shaft 85, the gear wheel 86 being connected to the pump driving shaft 11. The gear wheel 86 is provided with a boss 89 having an eccentric outer surface 92.  The cam 99 is freely mounted on a boss 106 concentric with the shaft 85.  A wobble plate 93 having a rectangular opening 94, whose shorter side is equal to the diameter of the eccentric surface 92, is fitted over the boss 89. A short peg 96 fixed to the plate 93 engages a radial slot 98 in the cam 99, and a longer peg 97 fixed to the plate 93 extends through an arcuate slot 101 in the cam 99 and engages a hole 102 in the gear 103.  Rotation of the gear 86 causes an oscillatory motion relative to the gear 103.  The gear wheels 103 and 86 are driven by the gears 104 and 87 respectively and are selected so that the cycle of rotation of the cam is long relative to the cycle of rotation of the pump gear wheel 86.  The gears 104 and 87 may be driven by an arrangement similar to that for driving the gears 43 and 47 described above.  The apparatus may also be employed for spinning cuprammonium solutions of cellulose or solutions of nitrocelluse, cellulose acetate, cellulose propionate, ethyl cellulose, polyacrylonitrile, vinyl chloride, copolymers of acrylonitrile, zein, or casein and for melt-spinning nylon.