US 4,375,190 AGranted

Printing press having a plurality of printing stations

AssigneeHalm Instrument Co., Inc.

InventorsEmanuel Quinci, Clement R. Konars

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Abstract

Paper gripper improvement in a printing press of the type having a frame, a large paper carrying impression cylinder drum mounted on the frame and a plurality of retractable printing stations mounted on the frame and spaced around the drum. Each gripper has a stationary finger and a second finger reciprocatable with respect to the stationary finger. A cam is connected to operate the reciprocatable finger to grip the paper as it is fed onto the drum. To detect a missing paper, an electrical circuit is completed by contact between the stationary finger and the reciprocatable finger in the absence of a paper between them insulating them from each other, whereby the need for photo-cells or other detectors to detect missing papers is eliminated. The inking rollers are driven separately from the drum to facilitate retracting the printing stations in the event of a missing paper.

Claims3

Dependent claims

In a printing press of the type having a frame, a large paper carrying impression cylinder drum mounted on the frame and a plurality of printing stations mounted on the frame and spaced around the drum:

means to positively grip papers on said drum comprising at least one gripper having a stationary finger and a second finger reciprocatable with respect to the stationary finger,
and cam means connected to operate the reciprocatable finger to grip a paper as it is fed onto the drum, the reciprocatable finger being spring loaded to absorb shock,
wherein each printing station has a printing roller normally in contact with said drum, means to pivotally mount the printing rollers on the frame,
means to pivotally move the printing rollers with respect to the surface of the drum and means to detect a missing paper comprising an electrical circuit completed by contact between the stationary finger and the reciprocatable finger in the absence of a paper between them insulating said fingers from each other, each printing station having a plurality of inking rollers,
and a timing belt connected to drive the inking rollers independently of the printing rollers.

2 more elements

Dependencies are inferred from the claim text.