Patent GB-119846-A (GB)
Title: Improvements in Machines Employed in the Cutting of the Pile of Pile Fabrics.
Inventor: ROGER GEORGE
IPC: D06C13/08
Filed: 1918-07-26
Abstract: 119,846. Roger, G. July 26, 1918. Pile, cutting; stop-motions.-In a machine for cutting the pile of pile fabrics and comprising a knife retained in position by one or more members adapted to turn about an axis under pressure or on release of pressure, a pressures-adjustment device is provided and means whereby the adjustment may be effected during the running of the machine ; special means for supporting and tensioning the fabric are provided. An ordinary knife-holder i, Fig. 3, is pivotally mounted on a vertical pin on a rest j bearing on the fabric, and the holder or the rest is pressed forwards by a finger device h slidably mounted on a rectangular shaft f pivoted in brackets secured to the machine frame F. An arm k' on the shaft f is connected to a stop l by a spring k<2> and a flexible connexion k<3> passing around a pulley m and an eccentric piece n, which is provided with a handle n' for adjusting the pressure exerted by the device h on the holder or rest. The setting-in position of the knife is towards the front of the machine, in which the fabric a, Fig. 1, passes from a roller b through a series of tension bars to a back roller c<1> mounted on a driven shaft c<4> between guiderollers c<2>, a roller d, preferably with a brush or like frictional surface, being employed adjacent to the rear roller c<2>. The accumulated fabric is carried to the front of the machine by a travelling scray e, which delivers it to an inclined board e<1>, whence it passes to the roller b. The board v extends the greater part of the distance between the rollers c, c', is preferably wider than the fabric, and is supported by cross-bars v' on or in the frame F. Local tension is applied to the part of the fabric being cut by a short cylinder 1, Fig. 9, rotatable on or fixed to rods 3 passing freely through a bracket 4, slidable along a fixed bar 5, and through a cross-piece 6 adjusted by a screw 7, passing through a bracket 8 slidable on a fixed bar 9, and acting through springs 10 on collars 3<x> on the rods 8. The cylinder 1 bears on the fabric between rollers 2, Fig. 1, and may be mounted to bear downwards or upwards thereon. The cylinder may be weighted, the springs 10 and screw 7 being dispensed with. A uniform drag may be given to the fabric by connecting the shaft c<3> of the roller c by a gear wheel to a spiral, which is mounted on the frames and may be provided with a governor. If the knife point pierces the fabric, the device h is pressed backwards and raised, freeing the knife holder and rest which move with the fabric until the machine stops, the stoppage being effected by the turning of the shaft f, as described below. The race is then cut by hand up to the setting-in place x, and, during the operation, extra tension is put on the fabric by treadle-operated ratchet-mechanism acting to turn the roller c'. If the knife leaves its race, the holder i is pressed forwards by the device h until a projection x<2> on the holder meets a stop-bar x', the machine being stopped in this even also by the consequent turning of the shaft f. The machine is driven electrically, and its motor circuit is connected by wires q<1>, Fig. 8, to insulated springs o<2>, p bearing respectively on a cam o on the shaft f and a spring o<1>. The wires q<1> are also connected by wires u<1> to electro-magnets u, the circuit through which is short-circuited through the cam o when the shaft f is turned, so that the magnets release a starting-lever t, Fig. 6. connected by a flexible connexion t<2> passing round a pulley t<3> to the stopping-lever, which is acted upon by a spring to move the driving-strap from the fast to the loose pulley when the lever t is released. The action of this spring on the lever t may be modified by a wire t' connected to the lever t and passing over a wheel to a balance weight. When the lever t is moved away from the magnets u, a bowl t<1> therein is moved away from an arm s<2> of a lever s, and this lever is pulled down by a weight s<1> to apply a brake band c<5> to a pulley c<4> on the shaft c<3> of the roller c. When the join of the fabric reaches the knife, it acts on a brush roller to turn it and wind a cord thereon, the cord being connected to an arm on the shaft f, which is thereby turned to stop the machine. The setting-in of the knife may be effected by hand or by the mechanism described in Specifications 19381/95 and 114,127.