B - Operations – Transporting – 26 – D
Patent
B - Operations, Transporting
26
D
164/114, 341/45
B26D 5/32 (2006.01) B26D 5/34 (2006.01)
Patent
CA 1281634
ABSTRACT Apparatus for severing sections from a web by transverse severing cuts at locations related to printed marks on the web comprises a rotary cutter and feed rollers, which are spaced apart, a differential transmission by which the feed rollers are operatively connected to the means for driving the rotary cutter, a servomotor for im- parting a correcting rotation to said transmission, a mark detector for detecting the printed marks, a sensor for de- tecting the position of the rotary cutter, and a controller for controlling the servomotor in dependence on the de- viation of the spacing of the printed marks from the pre- determined web section length. In order to provide such an apparatus which has simplified and less expensive drive means, the servomotor consists of a stepping motor , which receives form the controller stepping pulses (SM) in a number which represents the difference between the theoretical length of each web section, corresponding to that distance which would be obtained between each cut and the next following cut if the servomotor was arres- ted, and the distance between the printed marks asso- ciated with said cuts.
524472
Feld Karl-Heinrich
Feldkamper Richard
Fischer Herbert
Marks & Clerk
Windmoller & Holscher
LandOfFree
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