Patent GB-1051094-A (GB)
IPC: B41L11/00
Abstract: 1,051,094. Rotary duplicating machines. W. RITZERFELD and G. RITZERFELD. April 2, 1964 [April 26, 1963; June 7, 1963], No. 13563/64. Heading B6C. A rotary duplicating machine for printing selected lines or sections from a master sheet 3 comprises a printing cylinder 1 adapted to carry the sheet 3 with its lines extending in its axial direction, an impression roller 9 arranged to co-operate with the cylinder 1 under the control of an arm 13 which rotates synchronously with the cylinder 1, a stepping mechanism provided in a drive transmission from the cylinder 1 to the arm 13 and adapted to be actuated by at least one switching roller 21 designed to be selectively introduced into the path of a switching pawl 11, and a lamp 15 and a photo-cell 14 for sensing indicia allocated to lines or sections of the sheet 3 and automatically controlling the stepping mechanism for the arm 13 for controlling the co-operation of the cylinder 1 and the roller 9, the number of indicia determining either the magnitude of the line transport of the arm 13 to be performed after each rotation of the cylinder 1, or the number of drum revolutions for which the automatic line transport is interrupted. One line cam 10 only is shown in Fig. 1 and this rotates synchronously with the arm 13. Operation.-When a contact stud 18 on the arm 13 reaches a fixed contact 19 the lamp 15 is illuminated, simultaneously with the marking field 17 of the first line being disposed in register with the photo-cell 14. Since there is no marking present the condition of a pulse counter 16 remains " 000 " and the current circuit to the magnet 20 controlling the roller 21 and to the lamp 15 is unchanged and the roller 21 remains in the path of the pawl 11. A projection 22 on the cylinder 1 then closes a switch 23 but the counter is unaffected since it reads " 000 ". The pawl runs over the roller 21 and through a stepping mechanism, not shown, the cam 10 and arm 13 are transported by one step corresponding to the breadth of one line on the perphery of the cylinder 1. The second line is similarly printed by the line cam engaging a roller 8 connected by a linkage, not shown, to the roller 9, since there is no marking in the field 17 for the second line. On the third revolution two markings are sensed and the counter 16 reads '' LL0 " and the current to the electromagnet 20 and the lamp 15 is interrupted by this information. The third line is printed, the projection 22 closes the switch and the resultant pulse sets the counter at " L00 ", and line three is again printed, this time on a second copy sheet. When the switch 23 is again closed the counter reads " 000 " and the current is restored to the electromagnet 20 and the lamp 15 for normal line transport operation. Fig. 2 (not shown), depicts a similar apparatus in which the number of markings per line determines how many steps the line cam 10 springs back through, there being a marking for each line to be printed and a further marking if the subsequent line is not to be printed. Up to three markings may be allocated to each line, there being an electromagnet and a switching roller associated with each marking position via a pulse counter. Figs. 3 and 4 (not shown) illustrate a modification in which an additional photo-electric sensing device is provided to detect a marking on the master sheet indicating the last line of the master to be printed. When the said marking is detected warning lights &c. indicate that no further copy sheets are to be fed and the machine is restored to its initial position for the master sheet to be charged etc.