GB1415361A - Yarn winding mechanism and method - Google Patents

Abstract

1415361 Drum drive control JOSEPH BAN CROFT & SONS CO 31 Jan 1973 11 Feb 1972] 4898/73 Headings D1F and D1J This invention is concerned with a yarn winding apparatus, Fig. 1, in which the yarn package 31 is driven by a drum 38, the pressure between the package and the drum being automatically varied between the limits of full engagement and complete disengagement according to the quantity of yarn that is sensed at the exit end of a yarn treating chamber 10, said sensing means 26 being coupled to control means comprising a rotatable drum 42 and a control linkage 40, 35 connecting the drum 42 with the displaceable one of the package 31 or drum 38. If the package is normally in driving engagement with the drive roll then the apparatus is set to move the drive roll and the package apart when the quantity of yarn at the exit end of the chamber 10 falls below a predetermined value. If the package is not normally in driving engagement with the drive roll then the apparatus is set to move the drive roll and the package into driving relationship when the quantity of yarn at the exit end of the chamber 10 reaches a predetermined value. The movable component may be the package or the driving roll. In Fig. 6 a piston and cylinder unit 51 rocks arm 96 anti-clockwise on receiving a signal from the sensing means 26. This causes friction shoe 97 to engage and rotate drum 42 through an arc'sufficient to cause cable 40 to rock the package 31, Fig. 1, away from the drive roll 38. When the signal ceases the piston and cylinder unit 51 reverts to its original setting and the spring 10 rocks the arm 96 about the pin 95 to ensure that the friction shoe 97 does not engage the drum 42 on this return stroke. There is a spring arrangement associated with the drum 42 to rotate it in a manner taking up any slack that may develop in the cable 40 as the package 31 grows. In Fig. 8 a piston and cylinder unit 130 is pivotally mounted on a plate 125 that carries the drum 121. When the unit 130 receives a signal from the sensing means 26 the piston 132 is forced outwardly so that the friction shoe 133 thereon engages the inner surface of the drum 121 and causes it to rotate by a small value. This rotation is transmitted by the cable 120 to the arm 35 in Fig. 1. When the piston and cylinder unit 130 is not in operation a helical spring 136 causes the drum 121 to take up any slack in the cable 120. Fig. 9 shows an embodiment similar to Fig. 8 except that the previous fricton shoe 133 is replaced by a disc 145 pivotally mounted at the end of an arm 141 carried by a pin 140 fixed to the plate 125. When the piston and cylinder unit 130 is operated the disc 145 rotates clockwise until an adjustable stop 149, 150 thereon strikes arm 141. Thereafter further expansion of the piston and cylinder unit 130 causes the disc 145 to engage the inner surface of the drum 121 and so turn it clockwise. This motion continues until the arm 141 has been raised to a setting in which the pin 140 strikes the bottom of the elongated slot 142. When the piston and cylinder unit 130 retracts, the spring 153 ensures that the disc 145 disengages from the drum 121 during the whole of said retraction. The spring 136 ensures that there is no slack in the cable 120 as the package 31 grows. A further embodiment, Fig. 10 (not shown), is somewhat similar to Fig. 6 except that the piston and cylinder unit (52) oscillates a cam (167) which, when the piston and cylinder unit is extended clamps a friction shoe (171) between the cam (167) and the drum 42 to cause a partial rotation of the drum for continued expansion of the piston and cylinder unit. When the piston and cylinder unit retracts a spring (173) pulls the friction shoe (171) away from the drum. In a further embodiment Figs. 11, 12 and 13 (not shown), expansion of a piston and cylinder unit causes a helical spring (218) encircling a clutch element (214) of a drum (240) to shrink radially on the clutch element (214) and grip it. Further expansion of the piston and cylinder unit then causes the grip of the spring (218) to deliver a partial rotation to the clutch element (214) and then also the drum (240). The drum (240) is coupled by a cable 40 to the arm 35 in Fig. 1. When the piston and cylinder unit retracts the helical spring (218) opens up and releases its grip on the clutch element (214). Stop-motion. If there is a break in the yarn 15, Fig. 1, an arm 33 is then free to rotate clockwise to halt the winding operation. When the arm 33 rotates clockwise it rocks lever 84, Fig. 5, clockwise pulls arm 35 via beam 80. The resulting pull on the arm 35 lifts the package 31 off the drive roll 38 and so stops the windng operation. During normal winding the gradually increasing package diameter rocks the arm 36 clockwise and the ratchet teeth 82a slide over a pawl 85 carried by the lever 84. The stop-motion may also include means to stop the feeding of yarn into the chamber 10 by rolls 18 and 19. Crimping apparatus. The apparatus shown in Fig. 1 in a stuffer crimper, the feed rolls 18, 19 being driven at a constant rate. Roll 19 is biassed towards roll 18 by a weight 20. Back pressure in the crimping chamber 10 is controlled by a choke means 21 applying pressure to the core of crimped yarn 22.