Offset duplicating machine
OwnerLaurent Doucetinventor
Life of this patent
Estimating the term…
Abstract
In an offset duplicating machine, an implement for marking, such as perforating, slitting, scoring or the like, each printed sheet conveyed through the machine; for transverse marking, a first marking strip is affixed lengthwise on an impression cylinder and a rotatable counter-roller is mounted adjacent and at a skew inclination to the impression cylinder; the counter-roller has an outer surface of hyperboloidal shape which allows the strip to progressively mark the passing sheet. By grooving the counter-roller or by varying the distance separating it from the impression cylinder, additional marking strips may be affixed to the impression cylinder to provide various marking configurations on the printed sheet.
Claims6
An offset duplicating machine comprising, in combination:
- a loading station for stacking sheets to be printed;
- means for successively conveying separate sheets from said loading station;
- a printing station for printing sheets conveyed from said loading station;
- means for transferring printed sheets from said printing station;
- an impression cylinder receiving said printed sheets from said transferring means and having a rotational axis perpendicular to the axis of travel of said printed axis;
- first marking means on said impression cylinder and including a sheet marking edge extending lengthwise of said impression cylinder;
- rotatable counter-roller mounted adjacent said impression cylinder and having a rotational axis of skew inclination relative to the rotational axis of said impression cylinder, said counter-roller having an outer surface of hyperboloidal shape lying adjacent to the outer surface of said impression cylinder and contacting said marking edge progressively along the length thereof as said sheets travel successively between said impression cylinder and said counter-roller whereby said sheets are marked transversely;
- second marking means mounted on said impression cylinder in a plane coincident with the line of travel of said sheets;
- said second marking means defining a marking edge whereby said sheets may be marked lengthwise;
- said first and second marking means consisting of elongated metallic strips having a base adhesively secured to the outer surface of said impression cylinder and teeth integral with said base, said teeth of said first-mentioned marking means being higher than that of said second marking means;
- pressure roller having a rotational axis parallel to the rotational axis of said impression cylinder;
- said pressure roller being mounted circumferentially spaced from said counter-roller in the direction of the transferring means and extending over said second marking means whereby lengthwise perforation of said sheets is effected as said sheets pass between said pressure roller and said impression cylinder toward said first marking means, and
- a delivery station for receiving said printed and marked sheets.
Dependencies are inferred from the claim text.