GB1324470A - Driving arrangement for rollers on printing machines - Google Patents

Abstract

1324470 Printing apparatus ADAMOVSKE STROJIRNY NARODNI PODNIK 5 Oct 1971 [12 Nov 1970] 46292/71 Heading B6C An inking and damping apparatus for an offset printing machine includes a primary drive means, a damping roller rotated continuously by the primary drive means and a secondary drive means, driven from the primary drive means, by which an ink duct roller may be intermittently rotated. The primary drive means is an endless chain. The ink duct roller may be driven by a ratchet gear, operated by a pawl brought into operation by a cam driven by the chain, or may be actuated by spaced pins which extend laterally from the chain to contact a gear-wheel. The cam-controlled pawl may be arranged to follow two fixed similar cams, having inset portions and arranged side by side, as it is swept around them by a chain-driven gear. If the inset profiles of the cams coincide the pawl is able to contact the ratchet gear during a maximum part of its circuit, and so impose a maximum rotation on the ratchet gear and duct roller. To reduce the rotation of the duct roller one cam is rotated relative to the other, so that their inset profiles coincide over a reduced are only. If the chain-carried pin drive is used, the driven gear and one which carries the chain may be locked by rotation of an eccentrically-mounted pin on the gear which is driven by the chain-carried pins, so that it contacts an abutment on the chain-driven gear and causes the two gears to rotate in unison, without regard to the chaincarried pins. The duct roller then rotates continuously. Ink from the duct roller is picked up by a cam-oscillated messenger roller, actuated continuously from the chain-driven gear.