Cutting – With means to monitor and control operation – Including means to correct the sensed operation
Patent
1986-12-02
1988-11-01
Schran, Donald R.
Cutting
With means to monitor and control operation
Including means to correct the sensed operation
83 76, 83312, 83365, 83371, B26D 534, B26D 540
Patent
active
047810904
ABSTRACT:
Apparatus for severing sections from a web by transverse severing cuts at locations related to printed marks on the web. The apparatus includes a rotary cutter and pair of feed rollers, a differential transmission by which the feed rollers are operatively connected to a common drive motor for driving the rotary cutter and the feed rolls. A servomotor is provided for imparting a correcting rotation to the transmission. A mark detector for detecting the printed marks, a sensor for detecting the position of the rotary cutter, and a controller for controlling the servomotor in dependence on the deviation of the spacing of the printed marks from the predetermined web section length are also provided. The servomotor is a stepping motor which receives stepping pulses in a number which represents the difference between the theoretical length of each web section and the actual distance between the printed marks.
REFERENCES:
patent: 3796117 (1974-03-01), Mukai et al.
patent: 4267752 (1981-05-01), Byrt et al.
patent: 4449433 (1984-05-01), Miyamoto
patent: 4519868 (1985-05-01), Hoffman
Feld Karl-Heinrich
Feldkamper Richard
Fischer Herbert
Schran Donald R.
Windmoller & Holscher
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