Patent GB-706934-A (GB)
Title: Spooling machines
IPC: B29C53/32
Filed: 1951-08-15
Abstract: 706,934. Winding webs. CELANESE CORPORATION OF AMERICA. Aug. 15, 1951 [Aug. 17, 1950], No. 19262/51. Class 100 (1). [Also in Groups VIII and XXXVII] A web winding machine comprises supporting means for a plurality of mandrels carrying winding cores, variable-speed driving means for each mandrel, means for moving each mandrel in turn, while the web is being wound on one of the cores, from a winding-station to a corechanging station, and a dangle roll supported in a loop of the web approaching the winding station, so that the position of said roll alters in response to the length of the loop and so varies the speed of the mandrel driving means to maintain the web tension substantially constant. As shown, a web 21, Fig. 1, passes through a tension control apparatus 22 to a take-up means 23. The apparatus 22 comprises a framework 24 carrying freely rotatable rollers 29 and 31 and a dangle roller 33 substantially counterbalanced by weights 36 carried by cables 39 passing around pulleys 38 and 39. Pinions (not shown) fixed to the ends of the roller shaft engage vertical racks, such that the roller 33 slides vertically up and down the framework in response to variations in web tension. The position of the roll determines the setting of a variable reactor 49 having a plunger 48 engaged by a cam 46 carried by bearings 35 supporting the roller 33. The reactor controls the speed of driving motors 80 and 89, Fig. 7, through a speed control of known type which varies the field voltages of the motors. A frame 53 comprises an arbor 54 driven through a worm wheel 64, a shaft 66, a reduction gear 69, and a motor 68. A pair of mandrels 72 and 73 are supported between freely rotatable centres 75 and 77 and similarly driven centres 74 and 76 respectively. The centre 74 is driven by the motor 80 through a shaft 88, gears 87, 85, 84, shaft 59, sprocket wheels 81 and 83. and chain 82. The mandrel centres 75 and 77 are axially slidable, to permit withdrawal of the mandrels 72 and 73, by handles 102 and 103. In operation, the web is wound on an adhesively coated core 78 on the mandrel adjacent the tension control apparatus 22, for example, the mandrel 72, such that after a length determined by a counter (not shown) has passed over the roller 31, Fig. 1, the counter closes a contact to energize the motor 68, Fig. 7, to rotate the frame 53 through 180 degrees, the motor 68 being stopped by a pin 145 on the frame 53 engaging a limit switch 146. The operation of the switch 146 also initiates operation of the motor 89 which rotates the mandrel 73 and of a reversible electric motor (not shown) which lowers standards 107, Fig. 1, supporting a webcutting mechanism 105 and roller assembly 104. The assembly comprises rollers 112, Fig. 11, which deflect the web 21 into contact with an empty mandrel for winding thereon after the web has been cut from a completed roll by a knife 121. The knife 121 is actuated to cut the web transversely by a spring 125 housed in a tubular guide 116 after release, by a disc 127, of the knife holder 120 from a slot, not shown, offset from a longitudinal slot 117. The knife is manually retracted after cutting by a handle 122, the holder being rotated by a torsion spring 123 into engagement with the offset slot for retention in the retracted position. During downward movement of the standards 107, Fig. 1, a pin, not shown, operates limit switches 182 and 191, thus stopping the motor .80. After cutting of the web, the standards are raised by the reversible motor until the roll being wound is almost complete, whereupon the counter initiates a repetition of the cycle of operation.