Devices for cleaning wiping cylinders in a printing apparatus

Claim 1

In a printing apparatus having a rotatable wiping cylinder and a receptacle for cleaning fluid, the receptacle being arranged to receive a portion of the periphery of the wiping cylinder, an improvement which comprises a scraper mounted for movement between a first position for engaging the periphery of the wiping cylinder and a second position in which it is spaced from the periphery of the wiping cylinder, a plurality of secondary scrapers arranged downstream of the main scraper in the direction of rotation of the wiping cylinder, the secondary scrapers being spaced from each other and engaging the periphery of the wiping cylinder, means being provided whereby the pressure with which each of said secondary scrapers engages the periphery of the wiping cylinder is adjustable by altering the angular position of each scraper with respect to the periphery of the wiping cylinder, and wherein a support assembly is provided for the secondary scrapers, the support assembly including a plurality of support members on which the respective secondary scrapers are mounted, a plurality of support shafts connected one each to said support members, a plurality of operating arms connected one each to the support shafts and being mounted in the receptacle, an elongated arcuate rail arranged co-axially with the wiping cylinder and having each said operating arm resiliently coupled thereto, means mounting the rail for slidable movement in an arcuate path substantially co-axial with the wiping cylinder, for adjusting the pressure with which the secondary scrapers engage the periphery of the wiping cylinder.