Patent GB-629978-A (GB)
Title: Improvements in selective printing devices
IPC: B41J1/20
Filed: 1947-07-15
Abstract: 629,978. Printing-machines ; typewriters. MOSSBACH, H. July 15, 1947, No. 18770. [Classes 100 (ii) and 100 (iv)] A hand-operated printing-machine which prints a single letter or a numeral or sign at each operation selectively is constructed with a casing 1 which has marked thereon two rows, one of letters, and one of numerals &c., as shown in Fig. 1, and a sleeve 35 made of plastic or other transparent material is made to slide on the casing 1, and by the aid of a mark x the sleeve 35 can adjust the types as required. The sleeve 35 can be secured to the casing 1 when making an impression, but is freed from the casing when making a type selection. 'Mounted within the casing 1 and movable relatively thereto is an indexing member 5 which is formed with flanges 6 and fitted with knurled discs 15 adapted to be rotated by pawl-and-ratchet mechanism as the casing 1 is depressed to make an impression. During this action the sleeve 35 is clamped to the casing 1, and the discs 15 move the work so as to leave the required spacing between each letter or other marking. The instrument is maintained in contact with the work during the printing of a line, but during each change of type the sleeve 35 is freed from the casing 1. The type surfaces 54 are pivoted to form an endless chain, and the chain is passed round a pulley 51 having four square sides, and an adjustably mounted pulley 50 carried by a bar 10 arranged in the casing 1 and secured thereto by screws. The type chain is held in place by a bar 55 secured to the bar 10. The sleeve 35 is connected by an arm 56 to a link 60 which is connected to a blank type member 52<SP>1</SP> arranged between the types corresponding to the letters and those corresponding to the numerals &c. To change from one set to the other the sleeve 35 is depressed to its lowest position and means are provided to switch the link 60 over from one side of the pulley 51 to the other to change the position of the blank type 52<SP>1</SP> from engaging the left set as shown in Fig. 3 to a position in which it engages the right set. Means operated by a spring-pressed prong 75, Fig. 18, act to carry the link 60 over the dead centre position when the change occurs. Inking of the types is effected by pads 90 carried by a trough-shaped metal frame 92, Figs. 3 and 18, each limb of which is attached to an inverted U-shaped yoke 95 formed of a spring metal strip and fixed to a plate 2 which closes the upper end of the casing 1. The pads 90 are normally kept out of contact with the types, but are moved inwards each time the casing 1 moves downwards relatively to the member 5. The plate 2 is held in place by screw means 99, 100, which permit withdrawal of the inking means. The casing 1 is pressed away from the bar 5 by means of a coiled spring 34 which surrounds a sleeve 32 formed with a screw which engages a threaded aperture in a flange 30 on the bar 10, and passes freely through an aperture 31 on a flange 7 of the member 5. In a modification the type belt is replaced by a type wheel corresponding to the pulley wheel 51, and selection is made by a flexible belt or linkage between the selector sleeve and the type wheel.