Patent GB-834804-A (GB)
Title: Improvements in and relating to balers
IPC: A01F15/14
Filed: 1956-04-19
Abstract: 834,804. Baling-presses. MASSEY-FERGUSON Inc., [formerly MASSEY-HARRIS FERGUSON Inc.]. April 19, 1956 [April 26, 1955], No. 11946/56. Class 94(1). In bale-tying mechanism for a pick-up baler, wires 238 are led from lower reels 235 over guide rollers 240 and further guide rollers 252, 253 carried by a pair of needles 246 and are joined to wires 237, led from upper reels 235 through guides 239, thus forming loops which are extended by the bale in formation until a metering wheel 230, rotated by the bale, operates trip mechanism to cause engagement of a one-revolution clutch 265 in the drive to a transverse shaft 256. This shaft carries a cam 255 which operates through linkage to cause swinging movement of pivoted arms 249 carrying the needles, whereby the latter are moved through the baling chamber as shown in Fig. 7 to carry the end portions of the loop into twisting and severing mechanism 231 which twist the wires together at spaced points and severs them between the twists, thus securing the loops around the bale and leaving the wires 237, 238 joined together so as to be extended by the next bale in formation. Retrograde movement of the material forming the bale is prevented by a spring-loaded finger 244<SP>1</SP>, and a pivoted spring-loaded stop 248<SP>1</SP> is provided to prevent forward movement of the bale-forming plunger when the needles are in the position shown in Fig. 7. This stop is coupled by a cable 250<SP>1</SP> to a lever 251<SP>1</SP> which is engaged by part of the needle assembly when the latter is in the retracted position, Fig. 5, so that the stop is withdrawn to allow normal movement of the plunger. The wire twisters 310, Figs. 3, 8 and 9, are carried by a support 311 which is rotatable on the shaft 256 so that it may be swung from the position shown in Fig. 7 to the retracted position shown in Fig. 5 to facilitate withdrawal of the needles at the end of the twisting operation. The mechanism for swinging the support comprises a lever 353 pivoted to the machine frame and carrying a roller 357 engaging a slot 358 in the support and a roller 355 engaging a cam 356 on the shaft 256 under the action of a spring 361. Each twister comprises a slotted pinion 326 cooperating with a slotted anvil 328 and meshing with a gear 312 or 313 on the shaft 256, each gear being formed with a toothless portion 322 arranged to engage in a groove 336 in the associated pinion so that one revolution of the shaft 256 causes four revolutions of the pinion preceded and followed by dwell periods to allow the severing and introduction of the wires. A shaft 337, journalled in the support 311, carries a wire-retaining finger 338, an upper wire-bending and cutting element 341 and a lower wire-bending element 342. During the dwell period following the twisting operation, this shaft is rocked against the action of a spring 344 by a cam 350 on the associated gear 312 or 313 to effect severing of the wires and bending of the twisted portions 245 and 352 through approximately 90 degrees so that they become embedded in the surface of the bales. By removing the pivot pin of the lever 353, the support 311 may be swung to a fully retracted position for cleaning purposes.