Patent GB-162903-A (GB)
Title: Improvements in and relating to apparatus for applying stop-motion pins to warp threads
IPC: D03D51/20
Filed: 1920-04-13
Abstract: 162,903. Magnano, S. April 13, 1920. Warp-stop detectors, threading.-Consists of apparatus for applying stop-motion pins to a sheet of warp threads, the pins being separated in and discharged from magazine in regular sequence crossways of the warp, the threads of which are positioned to receive the pins so discharged. The apparatus is supported on frame bars 1, Figs. 2 and 3, carrying racks 5 driving pinions 6 on the shafts 7, 7a, one of which has a hand-wheel 9, and a ratchet-wheel 10, the pawl 11 of which is on a loose arm connected to the main shaft 15, which is driven preferably by an electric motor. The shaft 15 is connected by a sprocket belt 29 and gears to shafts 17, 22, and 24, the first of which carries four cams 19 operating levers 31 against springs 35 in an arch 34. The levers 31 are connected by rods 55 to slides 57, Fig. 9, mounted in guides 61 at the end of four magazines 62, in which pins 59 are pressed forward by spring-pressed followers 63 and a cross-bar 70 having nuts 72 on screwed shafts 73 gearing with a shaft 76 operated through a ratchet 77 and pawl 78 and link-work from a crank 85 on the shaft 22. The pins 59, Fig. 7, are supported between straight and flared walls 66, 67 and the front pin is adapted to be discharged by the depression of a projection 58 on the slide 57. The shaft 24 carries triple cranks 25, portions 25a, 25<b>, 25<c> of which are linked to depending elements z, c, b respectively, which elements act to pick, position, and hold the thread. The shaft 15 carries opposed cams 40, 41 which operate rocker arms 43 against springs 44, and one of these arms is linked to an arm 95 passing loosely through which is a stem 91 having an abutment 93 and carrying a hammer 92 adapted to rest upon a considerable number of warp threads. When these are removed, the hammer 92 drops and its stem 91 pulls down a rod 90 connected to the pawl 11, thereby causing the carriage to be moved across the warp until the arm 95 lifts the abutment 93 and the hammer, which may then be rested upon another batch of threads. Beneath the magazines are opener rods a reciprocated by connection to the shaft 82, and having lateral endprojections 95, Fig. 9, to open the prongs of pins 59 as they fall over the threads 2. Each arm 43 carries a thread hold-back 100 and a crank 102 on shaft 22 carries a picking-finger 101, working at the crossing of the threads 2, the hold-backs only reaching the upper row of threads between lease rods 4. In operation, the carriage is turned by the wheel 9 until the hammer 92 rests on a batch of threads. The shaft 15 is then driven and a hold-back 100 descends between first and second threads under the hammer, as shown in Fig. 2. The finger 101 is then moved down to sweep over the threads and engage the first which is moved back and positioned under the central bifurcated prong 108 of the three-pronged elements z which are thereupon moved down to hold the thread in position to be straddled by a pin 59 displaced from a magazine 62, the opener a acting to open the pin in its fall. The elements z are then raised, and elements b moved down to cause their curved fingers 106 to engage and move the thread rearwards. The elements b are then raised and elements c move down to hold the thread against forward movement. This completes the cycle of operations. When a magazine is empty, the pawl 78 is raised and the shafts 73 turned back by a hand-crank on a spur-gear 201.