Patent GB-1053707-A (GB)
IPC: B41L11/00
Abstract: 1,053,707. Rotary duplicating machines. W. RITZERFELD, and G. RITZERFELD. June 5, 1964 [June 7, 1963], No. 23316/64. Heading B6C. In a rotary duplicating machine wherein the cylinder 8, Fig. 5, has a fixed clamp for carrying a heading- printing master sheet 1, Figs. 1-4 (not shown), an axially-movable clamp 9 for a line-printing mastersheet 2, and a clamp 10 for a masking-sheet 3, the lines of matter to be printed are arranged circumferentially of the cylinder 8 and the clamps 9, 10 for the line-printing sheet 2 and masking sheet 3 can be stepped axially by electromagnetic means controlled by the electrical sensing of indicia carried by the sheet 2. The masking sheet may be omitted, if desired. As illustrated, with the sheets 1, 2, 3 in the positions shown in Fig. 1 and the copy sheet 4 passing in contact with the sheets 1 ... 3 in a direction perpendicular to arrow B, Fig. 2, the lines 1KZ ... 3KZ of the heading master 1 and the line 1Z of the line master 2 are printed on the sheet 4. At the same time, a photoelectric sensing device senses indicia I on an exposed trailing part 5 of sheet 2, which causes a single pulse to be fed to a pulse-storage device 16 having three stages, one of which, L, is now conductive and the others OO being non- conductive. A switch 45 operated by a cam 44 on the cylinder 8 closes the circuit between the storage 16 and the sensing devices during the passage of the part 5 of the sheet over the sensing device 6. A switch 20 is subsequently closed by the first lobe of a cam 19 having three lobes corresponding to the three stages of the storage 16. Closure of the switch 20 causes the storage to be returned to O, O, O condition and an electromagnet 23 to be momentarily energized so as to actuate a ratchet-and-pawl mechanism and move the clamp 9 and sheet 2 one step in direction B, Fig. 2, to the position shown in Fig. 2. If the device 6 had sensed a II or III pulse marking on the part 5, two or three stages of the storage 16 would have been affected and the clamp 9 would have been advanced two or three steps. In the new position of sheet 2, the sheet 4 receives an imprint of lines 1KZ, 2KZ, 3KZ and 2Z, and the head 6 senses another I mark causing one axial step in direction B for sheet 2. At the same time, another sensing head 7 senses a two-pulse mark II on the part 5 causing both stages L, L of a two pulse storage 18 to be rendered conductive. These two stages cause two impulses to be transmitted to an electromagnet 24 as the switch 20 is closed by cam 19. The armature of the magnet 24 is moved in the direction F, Fig. 6 (not shown), against the action of a spring 25, and is fixed to an arm 26 carrying a pawl 27 which engages a rack 30 attached to the masking-sheet clamp 10. At the same time, a cam 31 on the arm 26 lifts a retaining pawl 32. Thus the two pulses cause the masking sheet 3 to be moved two steps in the direction F which is opposite to direction B. The sheets are now in the position shown in Fig. 3, and lines 1KZ to 3KZ and 3Z to 5Z are printed. As the rack 30 moves in direction F, it momentarily closes two switches 37, 38, one for each step, causing the two stages of a pulse storage 39 to be rendered active. After a copy sheet has passed the printing line, the two lobes of a cam 46 close a switch 47 causing the two impulses in the storage 39 to actuate an electromagnet 42, Fig. 6, which through ratchet devices similar to the devices 26, 27 cause the masking sheet to be moved back to its original position. A III mark is now sensed by the device 6, the device 7 being inoperative, so that the sheet 2 is moved three steps to the position shown in Fig. 4, for printing lines 1KZ . . . 3KZ, 6Z, on a sheet. Subsequently, the master sheet 2 is advanced one step at each revolution of the cylinder 8 under control of markings I on the sheet 2 so that succeeding copy sheets are printed with heading lines 1KZ ... 3KZ plus successive lines of the sheet 2.