No-lock printing plate assembly using flexible plates

Printing – Flexible-sheet-securing devices

Patent

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Details

B41F 2712

Patent

active

043041825

ABSTRACT:
A "no-lock" printing plate assembly including a plate cylinder having a smooth plate supporting surface interrupted by a narrow axial groove having parallel side walls terminating in leading and trailing edges to form a gap, the side wall adjacent the leading edge presenting a flat angularly undercut end face. A single register pin is rigidly anchored perpendicular to the undercut end face. The plate is formed of a thin sheet of resilient material having a first bend at each end spaced from the leading and trailing edges of the plate to define respective leading and trailing edge portions. The leading and trailing edge portions have alined notches dimensioned to register with the pin. The edge portions are spaced and dimensioned for insertion into the gap into a condition in which the first bends are peripherally spaced from one another to provide clearance between them. At least one of the edge portions of the plate has an acute second bend parallel to the first bend and spaced a short distance therefrom to provide a reversely bent lip of a width greater than the width of the groove sprung outwardly to form a resilient bridge between the side walls of the groove for frictional engagement. A second cylinder running in contact with the plate cylinder "irons" the plate into intimate engagement with the plate cylinder, cyclically renewing a vacuum seal between them.

REFERENCES:
patent: 2621592 (1952-12-01), Faeber
patent: 3108538 (1963-11-01), Barnes

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