High speed printer

949,675. Selective printing. ANELEX CORPORATION. May 9, 1960, No. 16266/60. Heading B6F. [Also in Division G4] Pulse operated high-speed printer.-A print roll 20, Fig. 1, having columns of type is constantly rotated past a row of print hammers 52, 72, which are actuated by timed pulses to effect. impression on sheets of paper 49 by an ink ribbon 46 or carbons 50. A pulse generator 23, Fig. 2, produces in each revolution a number of pulses equal to the number of type in each column and a clock generator 26 produces a pulse just before the start of each cycle. Printing occurs when pulses from a storage representing the character required in each column coincides with a pulse from the generator 23 indicating that the desired character for that column is at the print position. Hammer - impression arrangements. Groups 60 of hammers are placed in staggered relation to similar groups on the opposite side of the print position and each group contains alternately hammers 52, 72, the magnetic operating coils 70, 81 of which are arranged in line and below their respective hammer bars 62, 73, so that the hammers 9 and print columns can be closely spaced. Each hammer bar 73, Fig. 9, is secured to a reed 77 attached to a frame part of a group 60 and energization of the coils 81 attracts a portion 79 so that the bar 73 swings to effect impression. Hardened surfaces 5, 51 contact as the hammer moves towards the print roll and the time of flight can be adjusted by a screw rod 88 contacted by a rod 84 of the bar 73 in its rest position. The hammer bars 62 are similarly mounted on reed 66 but extend straight back over operating coils 70, Fig. 2. Blocks 91 on outer ends of reed 92 act as spring rests for the hammers. Adjustments for different numbers of sheets 17. The print roll 20 is mounted on a plate which by a hub 19 can be pivoted about a shaft and its position can be adjusted by turning a rod 104 which engages a set bolt 105 to accommodate different thicknesses and numbers of record sheets as indicated on a dial 108. Electric selection see Division G4. Specification 765,059 is referred to.