| 摘要 |
<p>INKING UNIT ATTACHMENT FOR LITHOGRAPHIC PRINTING MACHINES An inking-unit attachment for a printing press includes a fountain roller, a ductor roller for rocking movement between the fountain roller and a receiver roller, an idler roller in the nip between the receiver roller and an oscillator roller, and a pair of form rollers for transferring ink from the oscillator roller to the plate cylinder of the printing press. The receiver and oscillator rollers rotate at different peripheral speeds to provide a skidding action between one or both of such rollers and the idler roller to provide an even distribution and an increased quantity of ink to the oscillator roller. A three-function cam serves to reciprocate the oscillator roller in an axial direction, rock the ductor roller between positions in engagement with the fountain and receiver rollers respectively, and intermittently to drive the fountain roller. The form rollers are movable between a position in the nip between the oscillator roller and plate cylinder, a position spaced from the plate cylinder and engaged with the oscillator roller, and a lift position spaced from both the plate cylinder and oscillator roller. The inking-unit attachment is adapted to be releasably hung on the frame of the printing press, and to be driven from the plate-cylinder gear on the printing press through a shaft affixed to the platecylinder frame, where the shaft has an overload clutch to guard personnel from injury and the unit from damage. The form roller has positioning and adjusting means to permit its spacing with respect to the plate cylinder, independently of the attitude and position of the inking unit. The construction of the unit permits the isolation of the inkcarrying members and mechanism requiring lubrication, whereby contamination of the ink is minimized; the structural integrity of the unit minimizes ink spatter and misting on nearby objects. Access covers protect the ink from contamination from exterior sources and from exposure to incident radiation, and decrease the exposure of operating personnel to the hazard of moving parts.</p> |
