Patent GB-175310-A (GB)
Abstract: 175,310. Alvord, C. Aug. 10, 1920. Printing yarns.-Warp yarns for carpets &c. are wound on a drum which is rotated intermittently to variable amounts which are controlled by Jacquard mechanism, the drum being brought to rest between these movements and printing effected by traversing a colour roller across all the yarns on the drum. A scraper is brought into action automatically when the drum moves through its smallest interval, this scraper acting to prevent a ridge of colour accumulating at the junction of two adjacent stripes. The yarns 3 are wound evenly on a drum 1 from spools 4 and reciprocating guides 6, and after the yarns are wound, printing is effected by a roller 146 in a spring-mounted duct which is traversed to and fro across the drum by a band 89 passing over a pulley 88 operated by a sector gear 86 geared to a reciprocating rack 84. The rack is normally reciprocated by a crank-arm 67 which operates to traverse the roller 146 in one direction after the drum 1 has rotated through a given interval, and the roller prints also in its return motion after the drum has moved through another interval. In some cases, however, the roller may remain at rest while several movements are given to the drum, the arm 67 being de-clutched from its drive to permit of this. The various motions are obtained from a pulley 2 geared to a shaft 58 which drives the crank 67 and is geared by two segmental gears with a shaft 57 operating the means for advancing the drum 1. The drum 1 is geared to a shaft 15 fitted with a hand-wheel 14<1> and geared to a wheel 38 on a ratchet 28 formed with apertures 29 in which move pins 30 one of which is adapted to be projected by a hook 19 controlled by Jacquard mechanism 16, 17, 18. A freelymounted arm 40 oscillates, under the action of a weighted band, from the position shown in Fig. 10 until it reaches a projected pin 30 which holds the arm until a pusher finger 52 on an oscillating gear 54, which moves quickly in a counter-clockwise direction, Fig. 10, and returns slowly, carries the arm 40 with it, thereby advancing the wheel 28 and the drum 1 by the required distance. The arm 40 is limited in its motion by stops 45, 46, and if the movement of the drum requires a greater movement of the wheel 28 than half a rotation, the arm 40 acts on a lever 92 to cause the arm 67 to be declutched, and so delay the action of the colour roller carriage. The lever 92 acts by lever mechanism 96, 97, 100, 116 to cause a hook 126 to move over a lever 127 which is turned in a counter-clockwise direction to cause the end 127<a> of the lever 127 to engage a projection on a bolt with a part of semicircular section normally clutching the arm 67 to a driving-hub. A spring-pin 64 is fitted in one of the holes in the wheel 28, and this is kept projected by a spring. The various movements are timed from a position in which the arm 40 and pin 64 are in the line XX position, and at this position cams are provided for withdrawing the pins 30, 64 as they pass this position. When the arm 40 is stopped by the pin 64 and the pattern does not require a stripe at this position, the colour can is tripped by operating the lever 127 by a rod 116 connected to a lever 102 which is operated by a spring-controlled lever 107. Fig. 14, pulled into a slot 111 in a ring attached to the wheel 28. If, however, a strip is required in this position, a pin. 114 is projected by the Jacquard mechanism to prevent this actuation of the trip mechanism. Two scraper devices 155, 156 on opposite sides of the colour rollers 146, are so mounted on rollers with. hinge connections that when a bar 154 is in its raised position the rear scraper acts to prevent blurring of colours, the front scraper being inoperative. The bar 154 is normally depressed by a spring and can be raised by a pedal 150. The bar is automaticallv raised whenever two colour stripes are printed in adjacent positions. The pedal 150 is connected to a rod 167 on which reciprocates a pusher 172 operated by a cam 176 on shaft 58. Normally the pusher 172 reciprocates freely, but if a pawl 163 is brought into its path the rod 167 is depressed and the scraper brought into action. The pawl 163 is operated by a cord 161 attached to a lever 157 arranged to be moved to the position shown in Fig. 10, when the arm reaches the stop 45. Normally the cord 161 acts on pawl 163 too late to cause depression of rod 167, but if the arm 40 meets a pin 30 after moving back through one tooth only,. the pawl remains in operative position and thescraper bar is raised. This action is, however, cut-out when the arm 40 is moved back one tooth after the arm has been stopped by the spring-pin 64 with consequent tripping of the printing action. In this case, the pawl 163 is tripped by a cord 190 connected to a lever arm 187 acted on by a cam 183 which is moved through a third of a revolution by means controlled from a pawl' on the lever 127. The scraper mechanism forms. the subject-matter of Specification 175,584.