Patent GB-1033188-A (GB)
IPC: D01H5/36
Filed: 1965-04-07
Abstract: 1,033,188. Apparatus for making knop yarns. VEREINIGTE GLANZSTOFF FABRIKEN A.G. April 7, 1965 [April 11, 1964], No. 14762/65. Heading B5B. A machine for spinning multiple denier knop yarns uses a spinning pump adapted to be driven at more than one speed of rotation, said pump being connected to the drive controlling the foundation denier through a freewheel effective in a direction opposite to that in which the pump rotates, and two or more drives controlling the knop denier are each connected, one at a time, to the pump shaft through quick operating clutches, the freewheel being combined with a quick operating brake in such a way that, when one of the drives controlling the knop denier is switched off, the brake slows the pump shaft down to the rotational speed at which the foundation yarn is spun, bypassing the freewheel as it does so. The quick operating clutches and brakes are desirably of the electromagnetically active, quick-excitation friction type. Preferably, the rotational speeds of the drives controlling the knop deniers are between two and ten times higher than the rotational speed of the drive controlling the foundation denier. In Figs. 4 and 5, the spinning pump 10 is connected through the gearwheels 14 and 15 to the pump driving shaft 16 which extends into the transmission mechanism 19. The pump shaft is connected through a freewheel 23 to the gear-wheel 17 through which the drive controlling the foundation denier is transmitted. Connected with the gear-wheel is the first part of the electromagnetic brake coupling 24, whilst the other part is displaceably mounted on the pump shaft 16. Apart from the brake 24, the shaft 16 also carries the clutches 20, 21 and 22. One part (30, 31) of each of these clutches is mounted for displacement but not for rotation on the shaft. The clutches are connected through the gears 27, 28, 29 to the shaft 26 which in turn is driven by the motor 18 via the belt drive 25. The gear ratios of 27, 28 and 29 may be varied, e.g. by change gears. Clutches 20, 21, 22 rotate continuously at rotational speeds determined by the speed of rotation of shaft 26 and by the transmission ratios of gears 27, 28, 29, these speeds being designed to reach two to ten times that of the rotational speed of gear-wheel 17 governed by the drive controlling the foundation denier. Clutches 20, 21, 22 and brake 24 are operated in known manner by means of an impulse generator to which switching units associated with each of the clutches are connected. Impulse generator 44 comprises a signal carrier 33 and tappers 34, 35, 36 each associated with one of the clutches. These tappers may be switched on or off by switches 37, 38, 39 in accordance with the desired number of different knops. The impulses are transmitted through lines 40 to time limiters 45 in which they are converted into switching and braking commands. The switching times are transmitted from switch timers 46 through lines 48 to each of clutches 20, 21, 22, whilst the braking impulses are transmitted from brake timers 47 through lines 42, to brake 24. Signal lamps 41 may be incorporated in known manner in the lines for monitoring purposes, and a knop-monitoring device 43 may be connected through lines 42 to the impulse lines for the clutches and the brake so that the entire operation of the spinning machine may be monitored. Spinning liquid is delivered from the pump 10 driven in accordance with the programme stored in the signal carrier 33 to nozzle 11 where yarn 12 provided with knops is drawn off over drawoff roller 13.