Patent GB-1228489-A (GB)
IPC: G06C25/00
Filed: 1968-10-22
Abstract: 1,228,489. Selective printing. BURROUGHS CORP. 22 Oct., 1968 [6 Nov., 1967], No. 50037/68. Heading B6F.  Type-bar machines with additional type-wheel mechanism.-A full keyboard calculator, having the usual type bars (79, Fig. 4), is combined within a unitary case (Fig. 1) with an additional printing mechanism (21<SP>1</SP>) for printing in magnetic ink on cheques or other documents. Printing is accomplished by activating an impression roller 125 across a plurality of printing wheels 113 is serial fashion. Only when a cheque is correctly positioned in the document shoot 35, a two-way switch (37) positioned for encoding and other necessary electric circuits completed, are the type wheels 113 selectively set in accordance with the angular movement of auxiliary sectors (87, Fig. 5). Code racks (95, Figs. 4 and 5) are released and move under the power of their individual springs (97), thereby driving via pinions (91) the auxiliary sectors (87). The extent of the angular movement of the sectors (87), and therefore the movement of the code racks (95), is governed by the angular movement of the adding sectors (75) of the calculator. The movement of each code rack 95 is mechanically transferred via pinion (99), shaft 101 and pinion 103 to a corresponding code bar 105 of a plurality of code bars associated with the printing wheels of the cheque printer. Toothed slides 107 on the code bars 105 engage with the teeth of intermediate code wheels 111 which are adapted to drive the print wheels 113. During that part of the cycle of the cheque printer when the code bars 105 are returned to their starting position and the print wheels 113 are retained by the aligning mechanism in their selected positions, the code bars 105 move relative to the fixed slides 107, whereby springs 109 are tensioned. The slides 107 return to their starting position under the power of their individual springs 109 when the type wheels are released. Roller impression arrangement, Figs. 6 and (12).-Impression in the cheque printer (21<SP>1</SP>, Fig. 1) is effected by the roller 125 moved transversely across the selected and aligned characters on the type wheels 113. The roller 125 is carried by a block 127 slidably mounted on a head section 121, which section is mounted for reciprocation to and from the type wheels. The roller 125 is propelled transversely by a pin (131) on the block 127 following a helical groove (137) in the surface of a roller (133) rotatably mounted in the head section 121. Aligning for impression (Figs. 9 and 10).- Each of the type wheels 113 comprises a plurality of characters equally spaced and disposed along its periphery, and each character is separated from its adjacent character by a notch. A detent blade (117) carried by a pivoted bail (299) is moved into engagement with the notches on the type wheels prior to printing. In addition, a movable shaft (115) is moved into engagement with the intermediate code wheels 111 which drive the type wheels 113. Movement of the detent blade (117) and the shaft (115) is derived from a pair of slides (181 and 183) driven by a pair of cams (165, 167) on the drive shaft (163) of the cheque printer. Power (Figs. 7 and 8).-The drive shaft (163) of the cheque printer is driven by a onerevolution dog clutch (187, 193) controlled by a solenoid (217). The power for the clutch is derived from the electric motor (221) of the calculator. Special holder for cheque (Figs. 2 and 3).-A cheque inserted into the shoot 35, Fig. 6, drops between a front plate 51 and a backplate 49 and rests against bottom-edge switches (39 and 41) which provide bottom edge alignment. Right edge alignment is provided by manually sliding the cheque to right into right-edge contact with a limit plate (67). When the cheque is correctly positioned a solenoid (45) causes a plunger (59) to rock a lever (61), thereby rotating a cam-shaft (65). The raised portion (71) of the cam-shaft (65) is thereby lowered into contact with finger spring assemblies (55 and 55<SP>1</SP>). Each finger of the assemblies carries a ball tip (57) which projects an aperture (73) in the backplate 49 to securely hold the cheque against the front plate 51 of the shoot 35. Ink-ribbon mechanism, Figs. 6 and (9 and 13). -A magnetic ink transfer web for the cheque printer has a width equal to the printed line length. A supply spool 343 and a rewind spool 341 are mounted between two spaced and parallel frame members 151 and (153) which are pivotally mounted by a shaft (395) to the cheque printer for ribbon changing purposes. The ribbon is stepped forward after each printing cycle by a feed roller 355 intermittently driven by a ratchet-and-pawl mechanism (377, 375). The pawl (377) derives its motion from an upturned portion of the detent slide (181) of the aligning mechanism (see above). A pulley and belt system 403 transmits the drive from the feed roller 355 to the take-up spool 341. A spring-loaded bar 347 tensions the ribbon, and should the ribbon be exhausted or break, moves to operate a switch which channels current to a warning light (31, Figs. 1 and 15).