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US 5,361,960 AGranted
Off-line web finishing system with splice and missing mark stability
AssigneeSequa Corporation
InventorsRobert Fokos, Robert M. Williams, Orfeo J Salvucci
Life of this patent
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AssigneeSequa Corporation
InventorsRobert Fokos, Robert M. Williams, Orfeo J Salvucci
Estimating the term…
An off-line web finishing system performs plural functions on a pre-printed and rewound web at a series of pieces of equipment arranged in a line. Tension in the web is set at a variable infeed at a substantially constant value that is sufficient to facilitate handling of the web. A common web-transport system drives all draw rolls in the line in unison, at substantially the same speed, and without slippage between the web and the rolls. A second drive system, preferably one using a second drive shaft, rotates the function cylinders of one or more registration sensitive pieces of equipment in unison. A continuously adjustable variable transmission is operatively connected between the secondary line shaft and a main line shaft for the web transport. A control system adjusts the variable transmission. It includes a central microprocessor, an optical scanner associated with each function cylinder, and an encoder to measure the speed of rotation of the function cylinder. Each scanner senses adjacent registration marks on the web that define each impression. Control logic compares the sensed speed in the time interval T for one impression to pass on and produces an output control signal if the proper speed is not sensed and if the misregistration is less than a predetermined limit.
A system for maintaining the registration between i) a succession of impressions printed on a web of paper in a regularly repeated pattern extending along the web in a first direction coincident with the direction of movement of the web said web carrying registration marks associated with the impressions where the distance between adjacent marks is correlated with the repeat length of the impression and ii) the location on the web where at least one finishing machine, forming a finishing line, having at least one function cylinder performs an operation on the printed web at a position on the web which must be accurately correlated along the first direction with respect to said repeated pattern, comprising
A process for maintaining registration in a web finishing system between (i) a series of impressions printed in a regular, repeating pattern along the length of a web that is moving along its length and (ii) the point of operation on the web of a series of function machines having operating elements mounted on rotatable function cylinders which intermittently perform the operation as the web moves therethrough, comprising the steps of:
Dependencies are inferred from the claim text.