Patent GB-981588-A (GB)
Title: Improvements in or relating to web splicing apparatus
Inventor: STONE HORACE ALEXANDER
IPC: A24C5/20
Filed: 1961-08-23
Abstract: 981,588. Feeding webs. MOLINS ORGANISATION Ltd., H. A. STONE, and R. E. M. GEMMELL. Aug. 22, 1962 [Aug. 23, 1961], No. 30374/61. Heading B6B. A web splicing device comprises means to stop movement of a portion of a running web while a reserve formed from the running web continues to be fed to the machine, means to superimpose a replacement web on the stationary portion of the running web, cutting means to sever both webs, means to supply adhesive to one severed end, means to move one severed end by a desired length while the other end is held stationary, and clamping means to splice the ends in overlapping relation, the width of the splice being equal to the desired length. Running and replacement rolls 20 and 1 are mounted on carriages 16 and 3 respectively engaging a rail 6. The carriage 16 may be removed from the rail 6 by releasing a stop 14. Feed rollers 27, 28 feed the running web into a container, not shown, in which it forms a reserve, the roller 27 being driven by high and low speed clutches substantially as disclosed in Specification 964,066. The quantity of web in the reserve is controlled in the manner disclosed in Specification 933,019, between a maximum and minimum quantity. The diameter of the running roll is sensed by an arm 29, fixed to an arm 30 freely rotatable on a pivot 31 carrying a cam 32 engaging rollers 38, 39 of microswitches 40, 41. The microswitch 40 controls the high speed clutch (not shown) driving the roller 27, while the microswitch 41 starts a motor 42, driving a camshaft 48. The shaft 48 carries a carriage cam 49, a heater cam 50, a knife cam 51, and a paster cam 52. In operation, the replacement web from the roll 1 is threaded through the cutting and splicing section 24 and is anchored in the clamp 118. The arm 29 causes actuation of microswitch 40 when the diameter of the roll reaches a predetermined value, such that roller 27 is driven at a high speed to accumulate web in the reservoir, not shown. When the roller 27 stops, the running web is held by suction to plates 57 and 58 and the cam-shaft 48 is rotated by the motor 42. A gum dauber 106 is lifted out of a slot 108 in a gum bath 109 by the cam 52, thus wiping excess gum from the dauber. The cam 49 moves the carriage 53 forwards in the direction of web feed and then the cam 51 causes knife 83 to cut both webs. The cam 50 lowers the heater unit about its pivot 68, such that suction openings 79 and 80 contact the new web and hold it. The gum dauber 106 is lowered and contacts the severed end of the running web and is then raised by the cam 52. A spring 90 then raises the knife 83 and the severed end of the new web is swung upwardly by the heater unit 76. The cam 49 retracts carriage 53 with the severed end of the running web, held to the carriage by suction, to form the overlap of the two webs which are then spliced by lowering of the heater unit 76. The dauber 106 returns into the gum bath and the roller 28 is returned into contact with the roller 27 under the action of spring 126. The heater unit 76 swings upwards, a microswitch 117 switches off current to the unit, and the drive to roller 27 is restarted.