Patent GB-474091-A (GB)
Title: Improved process and machine for throwing natural and artifical silk
IPC: B65H54/14
Filed: 1936-06-05
Abstract: 474,091. Spinning and twisting natural and artificial silk. DICKER, S. G. S. (General Patents Corporation) June 5, 1936, No. 15804. [Class 120 (ii)] A continuous process for producing in multiple down-spinning apparatus fully thrown silk or artificial silk yarn in the form of headless packages is characterized by the combination of steps of drawing the silk directly from skeins or bobbins, supplying it to feed rollers B, Fig. 1, thence supplying the yarn to the traveller of a ring spinning device 107, so operated as to impart to the yarn the entire twist in a single spinning step then winding the fully thrown yarn on to packages ready for weaving without re-drawing, coning or copping and effecting the winding of the packages by a building-motion A such that interruption and subsequent resumption of the winding of any package may occur at any point in its formation without affecting its form. The yarn is given a preliminary twist as it passes over the feed rollers and before spinning, while a twist of over twenty turns per inch is imparted in the single spinning step. The machine comprises spindles 20 normally driven from the motor 2 by the belt 3, which passes round pulleys 4, 4<1> and drives building-motion A and the roller mechanism B, through the shaft 5 and sprocket chain 10, and the shafts 16. 19. The yarn is supplied from four swifts 25, the end of the strand from each skein passing through an eve 28 carried by the hub 23 and then through a condensing guide, the condensed strand 30 being led down to the roller mechanism B. Each swift is provided with a brake shoe 32, Fig. 10, carried by a rod 33 pivoted at 34 and urged against the surface 31 by a spring 35, its opposite end being bent at 37 and arranged just outside the rod 38 carrying the eye 28, Fig. 11. When the strand 30 is under normal tension, the rod 38 and the end 37 of the rod 33 are pulled outwardly against the spring 40. If the reel rotates too fast it destroys the normal tension and the spring 35 applies the brake shoe 32. If the strand breaks, the arm 38 is forced by the spring 40 against a contact 41 to complete an electric circuit and initiate a stop-motion. The roller mechanism B supported by an arm 42 and driven from a shaft 19 through bevel gears 44, 45, Figs. 5 and 6, comprises a roller 43 at least five inches in diameter and round which the yarn is looped several times. The roller 43 and bevel gear 45 are mounted on a shaft 50 supported in a bar 48 urged away from the bevel 44 by a spring. A latch bar 53 holds the bevels 44, 45 in gear, a projection thereon engaging a member 57 to hold the gears in mesh. The member 57 also carries an electromagnet 60 having an armature 61 pivoted at 62 and carrying a trigger 63. On breakage of a strand, the magnet is energized and the armature 61 attracted, the trigger 63 then being engaged by a projection 64 on the gear 44 which moves the trigger 63 and rocks the member 57 to release the latch bar 53. The spring then separates the gears 44, 45 and stops the roller 43. The outer end of the latch bar 53 is formed with an aperture 65 through which extends a spindle-releasing rod 66 pivoted at 67, the rod 66 being disposed behind a finger 68 carried by a mounting for the spindle 20 journalled on an eccentric pivot 70. This mounting is urged towards the belt 3 by a spring. On release of the latch bar 53 the first spring forces the rod 66 outwardly against the finger 68 to swing the mounting about the pivot 70 and move the hub 21 away from the belt 3 and against the brake shoe 72. A rod 74 on the rod 66 also opens contacts 75 to de-energize the magnet 60. The composite strand 30 passes through an eye 76 and successively round the grooves 78, 79, 80 on the roller 43 and over the guide 77, thence to an eye 82 and to the building-motion A, Fig. 4, which is driven from the shaft 16 and comprises a heartshaped cam 83 which oscillates an arm 84, and a second rocker arm 99 which is oscillated by another cam 88 carried bv the arm 84. The cam 88 and a worm gear 89 are mounted on a shaft 87 and are driven from the shaft 16 through a shaft 96 and a worm gear 98. The arm 84 is loose on the shaft 85 while the rocker arm 99 is fixed thereto. A bell-crank lever is mounted on the shaft 85, the horizontal arm carrying a roller 102 engaging a thrust plate 103 on the lower end of the traverse rod 104 which carries supporting rods 106 for the rings 107, while the vertical arm is connected to a rod 108 which operates the bell-cranks 101 of other units. In operation the heart cam 83 rotates at relatively rapid speed and through the arms 84, 99, 101 produces a movement of uniform amplitude always less than the desired length of cone while the half heart cam 88 moves much slower than the cam 83, and controls the gain.