IL22776A - Device for wiping engraved copperplates for monochrome or polychrome printing - Google Patents

Description

processes are known which the engraved copperplate is inked by means of inking rollers which spread the ink over the entire surface of the plate in the case of monochrome or distribute the several inks over the copperplate in the case of polychrome The copperplate then wiped so as to leave the ink only in the engraved In known processes the wiping effected either by means of a strip of cloth or which is appropriate for monochrome or by means of a roller which is cleaned by means of a solvent at each The latter process is particularly convenient for polychrome Sometimes a steel doctor is used in the process for recovering the ink from the surface of the engraved which has the disadvantage that the plates are apt to be The present invention concerns several improvements in the aforesaid wiping The invention consists in a device for wiping engraved copperplates for monochrome o polychrome characterised by a roller comprising radial doctor blades of a resilient material for rubbing the surface of the engraved plate and splashing the ink outwards by the centrifugal This arrangement enables the engraved plates to be wiped without danger of scratching Accordin to one rotary rollers are disposed in the the roller carrying the doctor blades for catchin the ink splashed outwards by the said doetor blades and conducting it to a collecting in tho below variouo A wiping device for engraved plates according the invention is shown diagrammatically in the single figure of the accompanying The engraved plate is fitted in a known manner to a roller 9 turning about its axis The wiping device is mainly constituted b rolle 1 turning at a high speed and comprising at its surface radial fins 2 of a resilient material such as a synthetic When moving past the inked engraved plate 3 the fins 2 touch the plate and scrape the ink from its Because of the high of rotation of the roller the ink is splashed on to rotatable rollers 7 which are disposed the roller catch ink and conduct it to a collecting ledge The wiping device accordin to the invention has numerous and in particulars it can serve as an ink recovering device for monochrome printing without the risk of scratching the as they would be by a metallic it can serve as a first wiper for polychrome printing and improve the quality of the can serve one of a larger number of wiping where several of them are The Invention is not limited to the embodiment described above and illustrated in the but numerous other embodiments are possible within scope of the insufficientOCRQuality

Claims (1)

1. HOW particularly described and ascertained the nature of our said invention and in what manner the same is to be we declare that what we claim A device for wiping engraved copperplates for monochrome or polychrome characterized by a roller comprising radial doctor blades of a resilient material for rubbing the surface of the engraved plate and splashing the ink outwards b the centrifugal A device according to Claim further comprising rotary rollers disposed in the vicinity of the roller carrying the doctor blades for catching the ink splashed outwards by these doctors and conducting it to a collecting A device wiping engraved substantially as described with reference to the Dated this 13th day of 1965 insufficientOCRQuality