Method and apparatus for printing on opposite sides of a web
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Jul 14, 1998
Grant Date -
N/A
app pub date -
Apr 4, 1997
filing date -
Apr 4, 1997
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A continuous web of material is unwound from a roll by driven pull rolls that feed the web material to a printing unit in a feedline of an envelope making machine. The printing unit prints a selected one of the inside surface and the outside surface of the web before the web is cut and folded to form envelopes. The printing unit is supported by a base which is mounted for pivotal movement on a platform of a fixed frame member. The base is connected to the platform by a vertical pivot pin for movement through a 180.degree. between a first position for printing the inside surface of the web and a second position for printing the outside surface of the web. The base of the printer is locked to the platform in the selected one of the first and second positions to perform the desired printing operation. The web is fed between counter-rotating impression and plate cylinders rotatably mounted and driven on the printer base. A film of ink is transferred by an anilox roll on the printer base to the plate cylinder which transfers the inked image to either the inside or outside surface of the web. To reverse the printing to the opposite surface of the web, the printer base is unlocked from the platform and pivoted about the pivot pin to move the plate cylinder to the opposite side of the web. The base is then locked to the platform, and the printing operation is resumed. With this arrangement, a single printing unit is used to print both surfaces of the web material.
First Claim
Other Claims data not available