Improved Printing Machine.

28,578. Thenard, L. P. Arnould, Baron, and Simon, J. M. A. Dec. 19. Cylinder machines.-In order to decrease the size of the cylinders and the travel of the bed in cylinder printing machines, the sheets are first perfected on one half by two cylinders 7, 8 co-operating with formes 1, 1', 2, 2<1> on the bed 40, and are then perfected on the other half by cylinders 13, 16 and formes 3, 3<1>, 4, 4<1>. Suitable bed-reciprocating mechanism is provided, comprising segmental wheels 37, 38 turning in opposite directions and gearing alternately with a single rack 39 under the bed 40, the reversals being accomplished by means of cams 41', 42<1>, 43', 44<1> on the wheels 37, 38 engaging rollers 41, 42, 43, 44, respectively, on brackets 45, 46, 47, 48 fixed to the bed. If desired, the rollers might be fixed to the wheels 37, 38 and suitablyshaped cams attached to the bed. The sheets are carried through the machine along the path indicated, by tapes and grippers.