Patent GB-1179305-A (GB)
Title: High Speed Serial Printing Device for Teleprinters, Accounting Machines and Data Processing Equipments.
IPC: B41J3/54
Filed: 1967-04-05
Abstract: 1,179,305. Selective printing. ING. C. OLIVETTI & C. S.p.A. 5 April, 1967 [12 April, 1966], No. 15632/67. Heading B6F. High-speed continuously rotating type-wheel machines.-A serial printing device for teleprinters, accounting machines, data-processing equipments comprises a type-wheel 15, Fig. 1, continuously rotating about a vertical axis, one sector 14 bearing a set of type and another sector 17 devoid of type and having a predetermined circumferential expanse commensurate to the time required for an impression hammer 22 to be restored taking into account the rotating speed of the type-wheel, the hammer having a striking width 24 so as to engage, during each revolution of the type-wheel 15 the entire printing face of a selected type despite a continuous feeding movement of a record paper 37 or 37<SP>1</SP>. Web feeding arrangements.-A paper web 37 is fed from a spool 38 over idle rollers 41, 39, 42, between the type-wheel and print hammer, and roller 43 by driven roller 45 as determined by the electromagnetically actuated pressure roller 47. The second paper web 37<SP>1</SP> which is printed from a hammer mechanism at the other side of the type-wheel is advanced by a similar mechanism. Ink-ribbon mechanism.-Ink-ribbons 57, 57<SP>1</SP>, one for each web, are advanced from spools 58, 58<SP>1</SP> across the printing position by frictionally driven take-up spools 65, 65<SP>1</SP>. The spools are continually urged to wind the ribbon by a machine drive and are permitted to rotate by rollers 62, 62<SP>1</SP> driven from shafts 63, 63<SP>1</SP> geared to shafts 44, 44<SP>1</SP> which are rotated by rollers 43, 43<SP>1</SP> as the webs 37, 37<SP>1</SP> are advanced. Hammer mechanism.-The print hammer, electrically operated, spring restored, has a hammer face 24 extending substantially a character pitch in width so that the timed operation will fully contact the whole surface of the type irrespective of its position at the printing station (see Figs. 4-7, not shown). Hammer anti-rebound device.-When the hammer 22 is restored by its spring 25 the armature 27 engages a stack of rectangular metallic plates 35 which cushion vibrations. Type-carriage, multiple printing point machines.-In the embodiment shown in Figs. 8 and 9, the printing device is designed as a page printer on continuous paper form. The printer comprises a type-carriage 78 advanced in both directions by the alternative engagement of nuts 105, 106 with a shaft 101 threaded with reverse threads. The carriage carries four equidistant type-wheels 15, each having their own hammer mechanism also mounted on the carriage 78. The type-wheels are continuously driven by shafts 16, and a shaft 92 which is axially slidable by means of fluting 93 to a driving pulley 95. Each type-wheel types in one-quarter of a page width both in letterspacing and return directions under the control of incoming electrical signals and local signals from synchronously rotating bored discs 96 in associating with a sensing device 197, 198, 199. Margin stops.-The carriage is provided with a pair of pins 99 secured to arms 81 on the carriage adapted to be engaged each by a corresponding spring-urged yieldable locking member 98 at each margin position.