Patent GB-1032437-A (GB)
Title: Yarn handling apparatus
IPC: D01H13/18
Filed: 1963-04-03
Abstract: 1,032,437. Yarn-handling apparatus; stopmotions. LEESONA CORPORATION. April 3,1963 [April 17, 1962], No. 13103/63. Heading DID. Yarn handling apparatus comprises means for forwarding the yarn, means for driving the forwarding means, a detector for sensing interruption in the yarn being forwarded which operates means to disengage the driving-means, and a brake to arrest the forwarding-means coming into operation when the disengagement takes place. The forwarding means may comprise rollers 104, 92, 84, Fig. 2 which forward a number of yarns to be taken up as a composite strand on a ring-twister. The stop and braking means are operative whether the break occurs in one of the threads entering the rollers or in the composite strand emerging from the rollers and is operatively connected with a brake on the take-up spindle. Rollers 104, 92 are on arms 100, 88 which can be pivoted for threading- up. Roller 84 is fast on a shaft 82 and is driven from a shaft 16 by meshing gears 120,122,146 and 128, gear 146 being on a lever 140 to be shifted out of mesh with gear 122 to interrupt the drive. Lever 140 is one of the three integral levers loose on shaft 82; of the others, lever 139 serves as a signal according to its position and lever 138 is connected by a cable 137 to a spring which, when the cable is slackened, contracts to apply a brake to the take-up spindle. Lever 140 is normally held by a catch 148 on a pawl 200 urged by a spring 204 to rotate counterclockwise about a pivot 86. Fast with gear 128 is a brake-drum 130, and a shoe 188 is carried by a pivoted lever 184 urged to braking position by a spring 194 connected to one of a series of holes, whereby its tension can be adjusted, in a pivoted member 196. The shoe is normally held off the drum by the engagement with a roller 190 on the lever 184 of a surface 142 on lever 139 which is subject to the tension of cable 137. The member which brings about the operation of the stop and braking parts is a rod 214 which is normally supported by a bar 215, Fig. 6, on a U- shaped rocker-arm 216 and depends through a slot in the end of a pivoted lever 108, the forward end 110 of the lever having a pigtail at 112 whereby the lever is supported against the action of an adjustable counterweight 116 by the emergent composite strand. The incoming yarns Y each pass through a pivoted guide 240, Fig. 6 which is thus held in the position shown against the action of a counterweight 244. When one of these yarns fails, the counterweight falls to engage bar 215 and depress the rod 214. When the emergent thread fails the lever 108 rotates to depress the rod 214 by engaging a stop 220. When the rod is depressed, it comes between an anvil 212 on pawl 200 and a cam 126 which is rotating with pinion 126. The cam is thereby enabled to rock pawl 200 and free the catch 148 which holds the three associated levers 139, 140, 141. These are thus freed to slacken cable 137 and release the spring associated with the brake for the take-up spindle. The brake is thus applied, and the release of the spring rotates the three levers anti-clockwise. Lever 140 thus moves pinion 146 to interrupt the drive and it slides down a camface 206 to force anvil 212 away from cam 126 to prevent the rod 214 chattering between them. As lever 139 rotates, the surface 142 slips past roller 190 thus freeing lever 184 to apply the brake-shoe 188. A hand lever 136 also loose on shaft 82 can be depressed against the pull of a spring 158 to a first position where it lifts the brake-shoe off the drum to allow roller 84 to rotate for re-threading, Fig. 4 not shown, and to a second position where it resets the parts to the operating position of Fig. 2. When the lever is depressed, an ear 180 on its hub engages the roller 190 to move lever 184 to withdraw the shoe, it being then held by the roller slipping into a shelf 182 behind the ear. On further depression of the lever 136 a pin 156 engages lever 139 so that the two move together, surface [42 of lever 134 engaging roller 90 to move lever 184 to fully retracted position and holding it there. Lever 140 moves with lever 139 until the catch 148 re-engages to restore the pinion 146 to a position where it operatively connects the pinions 122, 128, while lever 138 moves to tension cable 137 and lift the brake off the take-up spindle. To raise rod 214 a lever 172 connected to lever 136 pivots to contact a collar 218. A different arrangement of forwarding rollers is described (Figs. 7,8, not shown). Where a number of units as described are mounted to be driven from a common shaft 16, one or more units may be rendered imperative through the means described. The guide 240 is traversed to distribute wear on the rollers.