Patent GB-744903-A (GB)
Title: Improvements in or relating to devices for the manufacture of threads from thermoplastic materials
IPC: F16H57/022
Filed: 1953-02-09
Abstract: In apparatus for melt-spinning having a gear-wheel pump for feeding the molten material under pressure to the spinneret, the pump shaft is rotated by means of a coupling shaft coaxial with the pump shaft, the coupling shaft and the power input shaft are spaced apart and parallel with one another, and the coupling shaft is driven from the power input shaft by a gear drive consisting of two or more intermeshing toothed wheels, which drive is connected disengageably to at least the pump coupling shaft and can be swung out of its normal driving position to allow the removal and replacement of the pump without fouling the drive unit.  As shown, 1 indicates a power input shaft which drives a pump coupling shaft 6 by means comprising gear-wheels 2-5.  The shaft 6, which can be moved axially, drives a spinning pump, part of which is shown at 7 in Fig. 3.  The gear-wheels 2-5 are located in a housing 9 which is rotatable about the shaft 1, after the shaft 6 has been withdrawn from the pump 7, by means of a knob 29 fixed to the squared end 30 of the shaft 6 by the grub-screw 31 (Figs. 2, 3 and 6).  The housing 9 rotates by means of a sleeve 32 around a fixed sleeve 33, which houses a bearing 34 supporting one end of the shaft 1 (Figs. 2 and 4).  The sleeve 32 can be made to grip tightly the fixed sleeve 33 by means of ears 35 and the bolt and nut 36, 37 (Figs. 1 and 2), this assembly serving as a clamping device to hold the housing 9 in any desired position.  After swinging the housing 9 away from the spinning pump the latter can be removed and subsequently replaced.  The gear-wheel 5 drives the shaft 6 via the bush 10 which is connected to a ring 11 (Figs. 2 and 3). In the ring 11 are located pins 12, which pass through slots 13 in a frangible disc 14 (Figs. 6 and 7) which also fits on the squared end 30 of the shaft 6 and may be removed after removing the knob 29.  By drawing out the shaft 6 the disc 14 is disconnected from the pins 12, and the shaft 6 is thereby disconnected from the gear-wheel 5.  If, during spinning, a breakdown occurs in the spinning pump 7 and the shaft 6 offers too much resistance to rotation, the disc 14 will break and the shaft 6 will be disconnected from the gear-wheel 5, thus interrupting the drive to the spinning pump.  The disc 14 is 1-2 mm. thick and has openings 17 separated by relatively thin strips of disc material 38 preferably less than 0.5 mm. in width at their narrowest portions.  The shaft 6 is maintained in engagement with the pump spindle by means of pointed spring-loaded plungers 39 engaging a circumferential V-groove 40 in the thicker portion of the shaft 6 (Fig. 2).  In order to bring the shaft 6 into correct alignment with the pump shaft the nuts 20 and 21 are slacked off and the eccentric bushes 18 and 19 (Figs. 2, 3 and 5) are turned simultaneously until the shaft 6 has been moved the required amount in a horizontal direction.  Any vertical lack of alignment of the shaft 6 with respect to the pump spindle is then corrected by slacking off the nut 37 of the clamp bolt 36 (Fig. 1) and rotating the fine adjustment screw 26, which is rotatable in an ear 27 fixed to the spinning machine (not shown) and abuts against a lug 28 fastened to the gear housing 9.  After tightening the nuts 20, 21 and 37, the coupling shaft 6 is inserted in the spinning pump.  In order that the train of gear-wheels 2-5 may remain in mesh during the alignment of the shaft 6 with the pump spindle, the shaft of the gear-wheel 4 is mounted on the pivot connecting two radius arms 15 and 16, which are mounted so as to be rotatable around the shaft of the gear-wheel 3 and the shaft 6 respectively (Figs. 1 and 2).  Thus when the shaft 6 is moved to the right (Fig. 1) the gear-wheel 5 moves to the right with it and the gear-wheel 4 moves downwards, and vice versa, owing to the knee action of the radius arms 15 and 16.  In order to prevent rotation of the gear-wheel 5 during manipulation of the shaft 6 and replacement of the spinning pump by another and to permit rotation of the shaft 6 by hand, the shaft 1 is disconnected from the gear-wheel 2 by screwing a set-screw 43 (Figs. 2 and 4) into the housing 9 by rotating the screw-head 25.  The pad 44 of the screw 43 forces the rod 24 inwards against the pressure of a spring 45, which presses together the two halves of the claw coupling 22 between the shaft 1 and the gear-wheel 2.  The half of the claw coupling with the teeth 41 on the side face of the gear-wheel is thus separated from the other half of the coupling consisting of the meshing clutch plate 42, cross-pin 23 and thrust pin 24. <PICT:0744903/IV(a)/1> <PICT:0744903/IV(a)/2> <PICT:0744903/IV(a)/3> <PICT:0744903/IV(a)/4> <PICT:0744903/IV(a)/5> <PICT:0744903/IV(a)/6> <PICT:0744903/IV(a)/7>