摘要:
An apparatus to be appended to a rotary printing press for binding a succession of stacks ( S ) of printings with a thermally fusible paper band ( B ), comprising means ( R 1 , R 2 ) for supplying a continuous length of thermally fusible band, a band looper (2) for looping the band around the stack ( S ) on a slotted platform (1), a tightening roller (51) for tightening the looped band against the stack, a band heater (35) for heating the lapping parts of the tightened band under the platform into a fused joint, and a cutter (36) for cutting off the band in a position just upstream of the fused joint. With a view to efficient fusion of the thermoplastic overlay of the fusible paper band on the successive stacks ( S ), a heater control circuit (37) is provided for causing the band heater (35) to be normally energized for a first preassigned period of time ( T a ) at constant intervals during the operation of the apparatus and, in response to the heating of the band on each stack, after the fusion jointing, at least for a second preassigned period of time ( T b ) which is longer than the first preassigned period time.