GB1312803A - Warp knitting machines - Google Patents

Abstract

1312803 Knitting machines PLATT INTERNATIONAL Ltd 13 Aug 1971 [14 May 1970] 23425/70 Heading D1C A pair of measuring rollers 2, 3 which engage the yarn build 1 on the beam of a warp knitting machine at circumferentially spaced points are carried on a pivotal mounting and drive an output member 19 rotatable about the axis of the mounting which acts through control means to control the rotational speed of the beam so that the yarn delivery speed is substantially constant. Rollers 2, 3 are rotatable on a rocker plate 7 pivoted on a hollow shaft 9 secured to a column 11 carried on a mounting block 12 freely rotatable on a hollow shaft 13 encircled by a coil spring 14 which biasses rollers 2, 3 against yarn build 1. A timing belt 26 transmitts the drive from rollers 2, 3 to shaft 19 carrying a second sprocket 21 which through chains and sprockets drives a differential 33. A second input shaft 34 to differential 33 is driven through gearing from a steplessly adjustable variable speed drive unit 41 controlled by hand wheel 47 and having a constant speed input shaft 43 driven from main shaft 45. Shaft 45 also drives a shaft 50 carrying the warp beam through a variable speed drive unit 48 whose control shaft 51 is driven by the output shaft 35 of differential 33. When yarn is being delivered at the required speed shafts 32, 34 are driven at the same speed and therefore output shaft 35 is at a standstill. As the delivery speed falls, shaft 35 begins to turn and adjusts unit 48 to increase the speed of shaft 50 until equilibrium is achieved again.