Patent GB-864648-A (GB)
Title: Improvements in and relating to roll winding machines
Inventor: MACKIE JOHN KAY PRINGLE
IPC: B65H54/24
Filed: 1956-04-24
Abstract: 864,648. Winding yarns. JAMES MACKIE & SONS Ltd. April 17, 1957 [April 24, 1956], No. 12512/56. Class 120(2). In a travelling roll winder comprising a number of winding units arranged for repeated circulation over a closed circuit in which each winding unit in the course of each circuit passes through a supply package doffing station, a supply package replenishing station and a roll doffing station, the replenishing station is provided with means for automatically connecting the end of yarn on the new supply package to the end of yarn on the roll and the roll doffing station is provided with means which come into operation to doff the roll if, but only if, the roll has reached a predetermined diameter, the replenishing station and the doffing station being so relatively disposed that there will be a yarn connection between the roll and the supply package when the winding unit approaches the doffing station. In the arrangement shown each winding unit 11 is carried on a track 10 consisting of upper and lower rails 13 and 14, by rollers 16 and has an upstanding peg 22 carrying a supply bobbin 24, a pair of arms 26 carrying traverse scroll 28 which is driven by a tyre 33 kept in contact with shaft 12 by spring means, and which drives roll 41 supported in arms 35 and kept in contact with the scroll 28. Yarn is led from supply bobbin 24, through a tensioner 30 to the traverse scroll 28 and is thence wound on to roll 41. The roll 41 is wound on a centre 40 carried between arms 35 which are mounted to pivot together about horizontal axis 36 and individually about vertical axis 38. Supply bobbin doffing takes place at station A (Fig. 1) and the speed of the machine is so arranged that when a winding unit has travelled the full length of shaft 12 its supply bobbin will be exhausted. The empty bobbin is removed by riding up a ramp 42 on the lower rail 14 (Fig. 4) such that it is lifted from the peg 22 and drops into a receptacle. Supply bobbin replenishing is done at station B at which there is a magazine 44 containing a number of filled bobbins 45 the yarns from which are led to a central suction duct 46. The duct 46 has an extension which extends to the vicinity of the roll 41 whilst the latter is being rotated backwards by shaft 48 and presents the end of the roll and the 'end' from the new bobbin to a knitter. The new bobbin is then automatically dropped from the magazine on to the vacant peg 22. The yarn which extends from the roll 41 to the new supply bobbin 24 must be engaged in the tensioner 30 and to facilitate this a ramp 51 is provided on the rail 13 which ramp engages a roller 50 (Fig. 6) on an arm pivoted at 49 which arm removes a retaining fork 32 from the path of the yarn and opens the tensioner against spring means. Roll doffing. The roll 41 is lifted from the scroll 28 when the unit reaches station A by means of a roller 54 (Fig. 8) carried by roll carrying arms 35, engaging a ramp 55 and being swung upwards thereby. When the winding unit reaches the doffing station C the roll passes a pivotally mounted feeler 57. If the roll has not reached the predetermined size it passes the feeler and the doffing procedure does not occur. If however the roll has reached the desired size it pivots the feeler 57 which closes a circuit for a solenoid 58 energization of which brings a cam surface 64 into the path of a pin 61 which is connected with the arm 35 such that continued movement of the winding unit causes the pin 61 to engage the cam 64 and cause the opening of the arms 35 thus releasing the roll which falls on to table 65. The yarn is severed automatically and the end held ready for attachment to a new winding centre. Winding centre replenishment takes place at station D which comprises a turret centred on the axis of the chain sprocket 18 and having four pairs of arms 82 carrying pivotally mounted troughs 84 which support new winding centres. If on reaching station D there is a partly formed roll between the arms 35 then the replenishment mechanism is rendered inoperative. If however the roll has been doffed a new centre is fed between the arms 35 and clamped thereby, the end of yarn from the supply bobbin being clamped between one of the arms and the centre. The slack yarn between the supply bobbin and the roll is then tensioned by means at station E before winding recommences. The winding unit next proceeds to station F at which if a new centre has been inserted into the winding unit, a tag-ending operation is effected. A pin is brought into the yarn path to prevent the yarn entering the traverse scroll 28 and causing the yarn to be wound in a groove 110 on the roll centre outside the normal traverse length of the roll. The bobbin doffing and the knotting operations can alternatively be done by hand and the supply packages can be mounted on a conveyer separate from the winding units but moving in synchronism therewith. Also the winding centres may be driven by separate electric motors mounted on the unit. Specifications 865,653 and 865,654 are referred to.