Patent GB-192364-A (GB)
Title: Improvements in or relating to the manufacture of inking surfaces
IPC: B41C3/04
Filed: 1922-10-31
Abstract: 192,364. Soc. d'Exploitation des ProcÚdÚs d'Impression Sardou, (Assignees of Soc. Sardou et Cie). Jan 28, 1922, [Convention, date]. Inking-apparatus; rotary machines; offset machines; embossing and intaglio - plate printing; printing-surfaces.- Rubber inking-surfaces for inking only the printing parts of relief or intaglio printing-surfaces, are obtained by moulding from a lead matrix coated with a uniform layer of sodium silicate. The design is impressed into the matrix by means of a stereotype or like surface. The inking-surface is obtained by moulding and vulcanizing a rubber sheet attached to a paper band, which serves subsequently for attachment of the inking-surface to the inking-roller. The Specification as open to inspection under Sect. 91 (3) (a) comprises also a machine for printing in several colours at one impression from a plate having a design in relief or intaglio, or from a rubber offset surface comprising a rotary cylinder A, Fig. 1 (Cancelled), to which a. brass or zinc printing-plate M' is attached, or which may be fitted with a rubber offset surface, and a series of cylinders H fitted with rubber printing-surfaces I, and one or more similar cylinders M winch are employed for printing additional impressions on the outside of a sheet which is printed on its underside with offset impressions collected by a rubber surface substituted for the plate. M<1>. The cylinder A is arranged to coact with an ordinary impression cylinder when printing from a relief surface or from an offset surface M<1>, the cylinders H applying inks of different colours in designs to the surface M<1>. The sheets are taken from a table L and delivered by a cylinder K. When both sides of the sheet are printed, the sheet is delivered by a cylinder K<1> after receiving an offset design on its underscde, and a design in one or more colours from one or more cylinders M on its outside. The sheet is held by grippers N<11>to the cylinder A. When printing from a plate engraved in intaglio, the raised parts of the rubber surfaces on the cylinders H are adapted to apply ink directly to the depressed parts of the engraved plates, and the pressuremember in this case takes the form of a counterplate attached to a curved member O supported by a rocking toggle-lever P, and attached to a radially moving slide 0<11> Fig. 5 (Cancelled). The member O at the commencement of the embossing operation is in the dotted line position, Fig. 5 (Cancelled), and clamps on the cylinder A act on clamps on the member 0 and the members 0<1>, P force the member O against the plate M<1> and so produce the printing-pressure, which is maintained until a block 0<1> on the cylinder acts on a lever T pivoted to the member O and returns it to the dotted line position. Stops X. X<1> limit the motion of the member 0, and by moving the lever P by a handle R about its eccentric pivot Q, the member 0 may be tripped out of action. The cylinder A is normally driven by uniform gearing but it is driven by variable gearing arranged to have a slow motion when coacting with the pressure-member O. The rubber surfaces I receive their ink from polished metal, or glass, rollers obtaining ink from plates supplied by gelattine rollers arranged in fountains. The rollers H are adjustable laterally and are mounted in eccentric bearings which are adjustable to enable the cylinders to move nearer to the cylinder A when inking of intaglio-surfaces is required. To obtain a cameo printing-plate, the brass plate M' is printed from the rubber surfaces I, covered with " Palestine bitumen " and the unprotected part of the plate etched. To obtain the intaglio plate, the brass plate is treated with powdered bitumen treated with a solution of lacquer, alcohol, celluloid, and acetone. The design is developed in benzine which acts on the printed portion only, and etching with iron chloride completes the process. This subject-matter does not appear in the Specification as accepted.