Patent GB-1522819-A (GB)
Title: Yarn delivery apparatus for textile machines
IPC: B65H51/22
Filed: 1975-12-23
Abstract: 1522819 Yarn supply apparatus G MEMMINGER [trading as GUSTAV MEMMINGER VERFAHRENSTECHNIK FUR DIE MASCHINENINDUSTRIE] 23 Dec 1975 [31 Dec 1974] 52734/75 Headings D1C and D1J A yarn storage device, for a textile machine such as a knitting machine, and of the kind comprising a rotatable storage drum 1 onto which the yarn. 24 is fed tangentially and from which it is drawn off overend of the drum is characterized in that there is a yarn guide 33 extending into the path of the yarn as it is being drawn off the drum, the yarn guide 33 controlling the pull-off position of the yarn and being adjustably mounted so that it can be set to engage a selected side of the yarn according to the direction of rotation of the drum 1. In Fig. 1 the yarn guide 33 is inclined towards the viewer and the yarn runs over that side of the guide 33 that faces the viewer. The yarn guide is mounted on a rotatable plate 34 that can be rotated through 180 so that the yarn guide 33 becomes inclined away from the viewer and the yarn is then manually repositioned so that it runs across the side of the guide 33 facing away from the viewer. A ball and socket connection 38 holds the plate 34 in either of these settings. The plate 34 is rotatably mounted on a lever 36 pivoted at 39 and held against rotation about the pivot 39 by a ball and socket connection 40. The drum 1 is on a shaft 4 on which are rotatably mounted two pulleys 10 and 11. The pulleys may be driven in opposite directions or at different speeds. The shaft 4 is secured to a coupling disc 9 that can be selectively engaged with pulley 10 or pulley 11. As shown, the drum 1 comprises end discs 2, 2' interconnected by rods 22 to form a cage. Cooperating with this cage is gear construction 16 having teeth or pins 21 that mesh with the spaces between the rods 22. The gear construction 16 is inclined to the horizontal, as shown, and is freely rotatable. In operation, when the drum 1 rotates the gear construction also rotates and the teeth or pins 21 serve to tamp down the yarn turns on the drum 1 to force them in a downward direction. Stop motion. Resting on the lower disc 2 is a ring 29, see also Fig. 3, the ring 29 being maintained eccentric with respect to the drum I so as to leave a crescent shaped space 31 through which the yarn passes to an eye or hook 28 of a stop-motion sensor and thence to a guide eye 15. If the inclined yarn guide 33, due to inattention, is in a position which is inappropriate with respect to the direction of rotation of the drum 1, the yarn drawn off will not be held by the guide 33 against rotation about the drum 1 and this will cause a lateral force on the sensor 28 and so stop the machine. If the tension in the yarn being pulled off rises, for example due to erroneous adjustment of the textile machine, the guide 33 will have a laterally directed force of such magnitude applied to it that the ball and socket connection 40 that holds the lever 36 in position releases its hold. The lever 36 then rocks to a setting in which the yarn 24 slips off the yarn guide 33 and the stop motion then operates as above. If due to fluff, dirt or other contamination there is an improper run-out of the yarn; due to stoppage at the guide eye 15, or due to erroneous adjustment of the textile machine, less yarn may be used than is supplied by the drum 1. This will permit the edge 3 of the lower disc to move the yarn off the yarn guide 33 and along the crescent shaped space 31 until the thread becomes wedged in the narrowing gap. This motion of the yarn around the drum will be sensed by the sensor 28 to cause the machine to stop. The sensor 28 can be omitted if the ball 40 is set in an insulating bushing and is used to close a circuit when the thread tension on the pin 33 is sufficient to cause rotation of the pin 33. If a plurality of the above described yarn supply devices are located around the circumference of a knitting machine, as in Fig. 7, a common belt drive 715 is preferably arranged as shown to obtain the maximum angle of contact between the belt and the pulleys.