GB211442A - - Google Patents

Abstract

211,442. Fallot, A. Feb. 14, 1923, [Convention date]. Rotary offset machines.-A rotary offset machine for printing in colours in various ways consists of an offset cylinder e fitted with two offset surfaces d, i which coact with printing-plates f, k of printing-cylinders g, l of the same size as cylinder e and arranged with their axes in the same plane. The arrangement is such that the plate f commences to print on the offset surface d at the same time that the plate k prints on the offset surface i. An impression cylinder b of half the diameter of cylinder e may be fed with sheets from a feedboard a, or with sheets cut by cutters z from a web b<1>. The parts m, o of the plate cylinders are below the printing level, but can be fitted with plates if desired, and from these extra plates direct or offset impressions can be obtained. When these are not used a two-colour impression can be obtained by passing a sheet around cylinder b and taking an offset impression from the surface d, and then transferring the sheet printed face downwards to grippers h to the surface i, which prints a second impression when it passes the cylinder b. For forming a perfected impression an offset surface is fitted to cylinder b, and it receives a double offset impression from the surface d which is printed on the opposite side of the sheet to the impression obtained from the surface i. Tripping-arrangements.-The cylinders b, g, l are mounted in eccentric bearings which are capable of being operated simultaneously by a threearmed lever u when it is desired to trip the cylinders. The centres of the eccentric bearings of the cylinders g, l are disposed at different sides of the common plane passing through the axes of these cylinders and the offset cylinder e. The Specification as open to inspection under Sect. 91 (3) (a) comprises also other arrangements of the machine for multi-colour printing. By fitting printing plates to the parts m, or o, a sheet can be printed with two double offset impressions on one side and a direct offset impression on the other side. Or the plate m can superpose a direct impression on a sheet which receives an offset impression from the surface i, and a double offset impression from the cylinder b. This subject-matter does not appear in the Specification as accepted.