Printing – Rolling contact machines – Rotary
Patent
1982-09-29
1983-11-22
Eickholt, E. H.
Printing
Rolling contact machines
Rotary
226143, 83 74, B41F 1304
Patent
active
044162006
ABSTRACT:
In die cutting the impression roll is maintained at constant peripheral velocity and the web, while engaged by the die, travels at the peripheral velocity of the impression roll. As the trailing edge of the die approaches the nip formed by the impression and complementary rolls, one or both of the feed rolls driven by the web is clutched into a cam mechanism for positive driving at a constant velocity equal to the die-induced velocity of the web. This constant velocity driving of the web jointly by the die and feed rolls continues until the die releases the web beyond the aligned centers of the treatment rolls when the web comes under exclusive control of the feed rolls. The cam-controlled velocity of the feed rolls and web then decreases to zero, is maintained at zero velocity for a period of time dependent upon the peripheral distance between the die trailing edge and die leading edge, and is then driven in a reverse direction for a fixed distance and accelerated forward to the peripheral velocity of the impression roll at which point, during the constant velocity motion of the feed rolls as induced by the cam mechanism, the leading edge of the die engages the web at the exact point of disengagement of the trailing edge of the die on the previous cycle. While still in the constant velocity portion of the feed roll drive cycle, the clutch is disengaged and the feed rolls freed for web induced travel, the web itself now being driven by the die engaged therewith.
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"Variable Cutlength Rotary Die Press", Leaflet No. 774, Deritend Engineering Co., Aug. 1980.
Eickholt E. H.
Sonoco Products & Company
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