Patent GB-926980-A (GB)
Title: Printing apparatus
IPC: B41K3/00
Filed: 1961-05-23
Abstract: 926,980. Selective printing. BURROUGHS CORPORATION. May 23, 1961 [May 31, 1960], No. 18636/61. Class 100 (4). [Also in Group XIX] Type-bar machine with additional type-wheel mechanism.-An adding machine (basically a Burroughs "Series P ") having the usual typebars 21 set by the mechanism 11, 12, 14-18, and accumulator wheels 13, has an additional printing mechanism for printing on cheques. This mechanism comprises fourteen type-wheels 24 selectively set by sector extensions 23 which are coupled to the adding sectors 12. Impression arrangement.-The arrangement for impression comprises a combination of moving the cheque up to the type-wheels by a series of interposes 33 and then operating a hammer 34 after the movement of the interposers 33. Although there are fourteen wheels, impression may be suppressed in certain places in accordance with a preset programme, and in any event only half of the hammers are operated at once to relieve the load on the hammer drive roll. The interposers 33 are vertically slidable on a square bar 101 and urged upwardly by springs 102 but are normally prevented from so doing by the end part 202 of slides 200 engaging a notch in the side of the interposers 33. At a certain moment in a machine cycle the slides move to the left, Fig. 6, and their left ends 201 either enter a notch 38 in a programme disc 37 or if they engage the perimeter of one of these discs the end 202 does not release the interposer 33. There are fourteen programme discs 37, Fig. 8, which can be rotated into any eight positions according to which wheels are to effect printing. The rotation is controlled by a programming device 36 which responds to the depression of certain keys on the keyboard. The discs 37 are rotated by a shaft 150 and a knurled roller 160 which, is driven at the appropriate moment in the machine cycle by an intermediate roll 175, Fig. 5, which is moved to couple the roller 160 with a power-driven roller 170. The disc 160 has electrical contacts and when preselected contacts on a fixed switch plate 151 are reached an electromagnet 52 is reached and a dog 193 arrests the rotation of the programme device by engagement in a notch in a stepped disc 165 attached to the roller 160. Hammer impression action occurs only for the wheels required as only the slides 200 which move permit a link 122 to trigger a pawl 119 for engagement with a hammer power roller 35. The last movement of the hammer is completed by momentum. The slides 200 are normally biased by springs 204 to engage the coding discs 37 but are restrained by a bail 205 operated by cams on the cyclically main shaft 40. Operation of bail 205 allows all slides to move but only half do so as a further bail 215 which is cut-away over half its length (see 215<SP>1</SP>, Fig. 7, not shown), permits only those links 122 with the raised part 217 opposite the cut-away to move. At about 15 degrees later in the machine cycle bail 215 is released by a further cam action from shaft 40 to permit the second half of the hammers to operate. Double operation of the hammers is prevented by a latch 131, 130 which is released later in the print cycle. Auxiliary power.-The type-wheels and typebars are set by a cylindrically operating pitman 20 eccentrically coupled to a main machine shaft 40 rotated by a one-revolution electricallyoperated torsion clutch driven by an electric motor M (see Fig. 4, not shown). Aligning for impression.-The type-wheels 24 are aligned by bail 28 on cams 258-251, Fig. 2, actuated by a further cam on mainshaft 40. A resilient coupling is made between arms 258 and 251 and corresponding arms at the other end of the bail 28 so that the coupling will yield if the bail engages a high point in a printing wheel. Cheque-feeding and positioning.-The cheques are inserted in a feed shoot and transported by belts 29 through a guide plate 30 formed on a cheque table 30<SP>1</SP> to a position underlying the printing wheels 24. The cheques are halted by a stop mechanism 31. Interlocking arrangements.-A switch associated with the stop 31 and photo-electric sensing devices ensure that printing of the cheque does not occur unless, the stop is raised, the cheque is there, and the cheque is not in a skewed position.