| 摘要 |
PURPOSE:To enable paper supply despite the circumferential length of a new and an old rolls of paper to be unwound, by determining circumferential lengths for the rolls of paper in accordance with prescribed formulae and controlling the circumferential lengths to be smaller than the actual values. CONSTITUTION:The energizing of a pasting press 13 for a new roll of paper to be unwound and the movement of a cut-off knife 14 for an old roll of paper to be unwound are started at points P', K' downstream to pasting positions PP, KP. Operation time is taken into consideration so that circumferential lengths LP, LK for the new and the old rolls of paper are determined as LP=V.TP+LM and LK=V.TK-LT. To cause the press 13 to act, a preset timer circuit 8 is put in operation by a gate signal T1 so that a preset counter circuit 9 receives a frequency FLP after the lapse of time TP and starts substraction with a margin length LM. The subtraction is replaced with addition by a signal T2. The addition is stopped by a signal T3. Throughout the generation of the signal T3, a result of measurement is used as a latch output and the content of the circuit 9 is denoted by the formula LP. For the action of the knife 14, the quantities TP, LM in the calculation for the action of the press 13 are replaced with those TK, LK so that addition and subtraction are replaced with each other. |
