Patent GB-686175-A (GB)
Title: A spinning machine of the suspended centrifuge type for spinning artificial filaments
IPC: D01D7/02
Filed: 1949-08-13
Abstract: In a spinning-machine of the suspended centrifuge type for spinning artificial threads which are passed downwardly into the centrifuges through the hollow driving-shafts thereof, the centrifuges are mounted vertically above the spinning bath or baths.  As shown, the upper part of the machine frame is provided with two horizontal channel-section frame members 2, to which centrifuges 4, 5 are secured by means of bearing-brackets 3 on both sides of the machine. The threads are drawn up from the spinning nozzles 7 in the spinning baths 1 by godets 8 between adjacent pairs of centrifuges and then pass vertically downwards into the thread funnels 9 which are suspended in supporting devices 10 secured to bars 11 of a traversing mechanism.  Each thread funnel 9 is connected by a flexible tube 14 to a pipe 12 which is secured to the back of the bar 11 and which supplies the gaseous or liquid medium by means of which the thread is conveyed through the funnel tube 13.  Gaseous media accompanying <PICT:0686175/IV (a)/1> <PICT:0686175/IV (a)/2> the thread pass to the atmosphere through an opening in the base 6 of the centrifuge casing and accompanying liquid media fall through the opening as a stream 16 and are caught in a trough 17. From the troughs 17 the liquid accompanying the thread passes through an opening 18 into a chamber 19 which extends the whole length of the machine.  Over the centrifuge 4 the traverse bar 11 is shown in its lowest position, but during spinning it is periodically raised to the position 20.  For the extraction of the cable of spun thread from the centrifuge, the traverse bar 11 and each funnel 9 are raised to position 21 shown over centrifuge 5. The lower end of the funnel tube 13 is then in a tubular projection 22 (Figs. 1 and 3) projecting above the centrifuge cover and having the same internal diameter as a protecting tube 23 which, as a guide for the funnel tube 13, extends far down into the bore of the hollow centrifuge driving-shaft.  The tubular projection 22 is cut away at the side in such a way that for a part of its length its cross-section is reduced to one quarter.  A drainage gutter 26 can be swung into or out of the lateral port 25 in the tube 22 (Fig. 3), said gutter being pivoted on a pin 27 in the centrifuge bearing bracket 3.  When the drainage gutter 26 is in the position in which it is swung out of port 25, the liquid medium accompanying the thread will convey the thread vertically downwards into the centrifuge even if the funnel tube 13 is raised to the position shown in Fig. 3.  When, however, it is required to extract a cake from a centrifuge, the drainage gutter 26 is brought into the position in which it projects into the port 25 by moving the bar 31 which is slideably located in the guide 30.  The thread will then pass via the gutter 26 into the drip tray 29 (Figs. 1 and 3) on top of the frame members 2.  The bottom of the drip tray 29 is pervious so that the liquid accompanying the thread can run off through a tube 36 (Fig. 1) into the chamber 19. The slideable bar 31 extends along the whole length of the machine, so that all the drainage gutters 26 on one side of the machine can simultaneously be brought into either of the positions referred to above.  The swinging of the gutters 26 into the port 25 is effected immediately after the raising of the funnel tube 13 into its highest position 21.  After the centrifuge has been brought to rest, the hinged bottom 6 of the centrifuge casing is snapped down (Fig. 1, right), and the cable extracted downwardly. The thread now breaks against the edges of the gutter 26.  After the extraction of the cable, the centrifuges are restarted and when they have reached the required speed, the gutter 26 is moved, by means of the bar 31, into the position in which it does not project into the port 25.  Immediately afterwards the funnels 9 are restored to their normal position.  The threads then run through the centrifuges again but do not as yet touch their inner walls, so that they do not begin spinning-on.  This is effected simultaneously for all the centrifuges on one side of the machine by blowing the threads against the inner surfaces of the centrifuges by means of streams of air passed through the nozzles of a compressed air pipe 35.  Due to the centrifuges being mounted vertically above the spinning-bath instead of behind the latter, as is customary in machines using under-driven spinning pots, the centrifuge drives are more accessible.  Furthermore, as the driving motor of each centrifuge is mounted above the latter, liquid flowing from the centrifuge cannot enter the motor casing even if the latter is not liquid-tight.