Patent GB-627312-A (GB)
Title: Improvements in a bobbin winding machine
IPC: B65H54/14
Filed: 1946-10-03
Abstract: 627,312. Winding yarn. BURGESS, A. F. (Barber Colman Co.). ' Oct. 3, 1946, No. 29519. [Classes 120 (ii), and 120 (iii)] The traversing device of a yarn winding machine is moved axially of a winding spindle by a feed mechanism having a disengageable connection with a drive shaft, the feed of the traversing device being initiated at the beginning of a winding operation by a control mechanism including a rotatable shaft with cam means for effecting the engagement of the driving connection, following which engagement, the movement of the shaft is interrupted by the control mechanism, which also includes means operative automatically in response to the completion of the wind, to restart the movement of the shaft and disengage the driving connection. The machine in general. The machine comprises a plurality of winding units, arranged sideby-side, the spindles extending horizontally and each unit comprising bobbin-holding means A and a yarn supply B. Below each spindle is a means C for temporarily supporting the doffed filled bobbin. Each unit has an empty bobbin magazine D provided with an escapement device for releasing successive bobbins on to a reciprocating donning slide E by which they are fed to the device A, the yarn extending between the doffed bobbin and the supply B being clamped by the butt of the bobbin, a device F on the slide E clamping and shearing the yarn. The doffed bobbin is discharged from the holder C into a posket I for final discharge into a container J. Before a new wind is effected, a bunch is formed on the donned bobbin by a builder H, the normal. traversing device G being retracted during bunch-building and then advanced quickly at first and then slowly and continually, during the winding of the pirn, towards the tip thereof. The units have a common drive and control mechanism partly enclosed in hollow frame members of the machine. Bobbin holding means. The bobbin holders each comprise a spindle 6 driven by bevel and spur gearing from the main shaft 12 extending the length of the machine. The spindle 6 is provided with a chuck 7 having pivoted weighted jaws 16 which grip the bobbin butt under centrifugal force. The tail centre 8 for the bobbin comprises an anti-friction bearing carried on a pivoted spring-urged arm 21, rocked by a shaft 24, through a cam 26 on the main cam shaft 27, and lever train 28, 29, 30, to release the bobbin' tip for doffing and to position the centre 8 above the level of the slide E when a fresh bobbin is being fed to the chuck. Yarn supply. Each bobbin is fed with yarn from a package c enclosed within a housing 31 the front of which is closed by a cover 32, apertured at 33, swingable upwardly (to open the housing) about pivots 43, 44, the cover being attached to weighted levers 41, 42 and held open or closed by an over-centre device 45, 46. The yarn is led through aperture 33, about a pin 34 and then through a grid comprising fixed pins 48 and movable pins 49, spring-urged against the yarn. To facilitate threading, the finger 49 may be swung clear of the fingers 48. Lint produced at the tensioning device is removed by a suction trunk 58 and flexible connections 59. The yarn then passes over guides 36, 37 to the bobbin. Empty bobbin supply. Empty bobbins contained in a magazine D are released one by one, by an escapement device comprising fingers 67a, 68 rocked by a bar .73 through a bell-crank lever and a compressible link 72, the bar 73 being reciprocated by a cam 74 on the cam shaft 27. Bobbin donning. Upon release by the escapement device, the lowermost bobbin from the magazine drops on to spring-biased members 84, 85 in the slide E reciprocated by an arm 92 on a shaft 93 rocked by a cam on, the cam shaft 27, the arm 92 yieldingly actuating the slide E. During donning of a bobbin, the tail centre is held upwardly by its cam 26. Attached to the slide E is a notched plate 100, for guiding the yarn, having attached thereto a blade 102 with which co-operates a yarn shearing and clamping blade 103 operated by stops 107, which it meets during its reciprocation with the slide. The plate 100 positions the yarn across the chuck 7 so that as the bobbin is placed therein, its butt will clamp the yarn ready for bunch building. Bunch building. After leaving the guide pin 36, the yarn is engaged by a pin 109 oscillated by a shaft 111, the normal yarntraversing cam 132, with guide 37, having been retracted to an idle position, The pin 109 is oscillated from a cam 113, driven from the main shaft 12, only when arms 118, 119 are' in contact. The arm 118, however, is under the control of a cam 121 on the cam shaft 27, through lost motion device 126, 127 and rack and pinion gearing 122, 123, so that, upon the raising of the arm 118 by the cam 121, the bunch building ceases, the pin 109 being moved to an elevated position and away from the yarn. Main traverse and building motion. The yarn, released by the pin 109, is now traversed by a rotary cylindrical cam 132 moved forwardly from a retracted position, the cam having two oppositely sloping surfaces, a. finger 135 restraining. the yarn against lateral motion as it is engaged by the cam. All the traverse cams 132 are carried by a rail 136 having end portions 137 which slide in guides 138 on the end frames, the cams 132 ,being rotated by a shaft 143 through worm and wheels, the shaft 143 being driven from the mainshaft 12 through bevel wheels and splined shafts. During winding, the rail 136 is moved forwardly to build the pirns, by a shaft 147, pinions 150 and racks 151 ; the return motion of the rail being effected by a torsion spring 148 and controlled by a cam 149 on the cam shaft 27. The shaft 147 is driven by a disengageable worm and wormwheel connection 152, 153 from the shaft 12, the worm 153 from time to time being moved from the wheel 152, against a spring 155, by a cam 156 on the cam shaft 27. At the end of a winding operation, the connection 152, 153 is disengaged, the traverse rail is returned rapidly under the control of cam 149, which cam, following new donning and bunch building operations, brings the rail 136 forwardly for the next wind and the connection 152, 153 is re-engaged. Filled bobbin disposal. After the completion of the wind, the filled bobbins drop into a pivotally-mounted trough 163, tilted by a cam 165, on the cam shaft 27, after the thread has been clamped and sheared, so that the bobbin is discharged from the trough 163 on to an apron 170 and thence into a pocket' 171. The pocket 171 comprises plates tilted, from time to time, by a rock shaft which operates the bobbin escapement device, to discharge the bobbins into receptacles 172. Yarn positioning device. To meet starting up requirements, or if through yarn breakage, no filled bobbin has been received into a trough 163, the end of the supply thread may be placed, by the operative, into a clamp 184 disposed at the end of an arm 183 oscillated by a rock shaft 185 moved by the engagement of a rack and pinion 123, 122, to position the yarn in the notch of the plate 100 of the bobbin-donning slide E. Drive and control mechanism. The main shaft 12, which operates the spindles, traverse and building mechanism is driven by a motor M through a clutch and brake device 193, 194 normally controlled by a cam 225 on the cam shaft 27 which has two rest positions, through a link and lever system, but also manually, if desired. The clutch 193 is spring-urged towards a dis-engaged position but is held engaged by a yieldable latch 217, which is tripped, on completion of the wind, by a stop member 222 carried by the builder slide 137. Upon completion of a set of bobbins, the cam shaft 27, actuated separately by an electric motor M<SP>1</SP>, through a clutch and brake unit 231, is set in motion to reposition the elements for the next wind, the unit 231 being controlled by a solenoid 237 which may be energised by three switches (a) 238 (b) 239 or (c) 240 arranged in parallel circuits. The switch 238 is closed by the builder slide 137. at the completion of its travel. The switch 239 is closed upon disengagement. of the builder feed mechanism 152, 153. In the circuit to the switch 239 are positioned, in series, hand switches 244, so that when the-operative breaks this circuit by opening a switch 244, the cam shaft 27 will be stopped in its first rest position, i.e. a position corresponding to no winding, by the opening of the switch 240 by the cam 246 on the cam 156. The switch 240 is also under the control of another cam 245 on the cam 156 which will stop the shaft 27 in its second rest position, i.e. during a -winding operation.