Automatically controlled machine for making double-faced polyboard
AssigneeWestvaco Corporation
InventorPartha S. Chaudhuri
Life of this patent
Estimating the term…
Abstract
A polymer plastic coated paper double-facer corrugating machine equipped with web preheating cylinders having position adjustable wrap control arms is described having a variable response relationship between the machine production speed and a corresponding wrap control arm setting. The double facing nip of the machine is provided with a series coupled pneumatic loading spring and worm jack to set the nip clearance. For transitional support of double faced product between the load variable nip roll and the lower tractor belt of the double-faced board pulling section, an air table is provided.
Claims9
In a corrugated board machine having a web preheating cylinder rotationally driven by first motor means and wrap guide roller means mounted on swing arms secured for rotation about the axis of said preheating cylinder, the angular positionment of said swing arms being placed by transmission means driven by second motor means, the improvement comprising:
- A. velocity signal generating means for producing a signal range proportional to the surface velocity range of said preheating cylinder;
- B. feedback signal generating means for producing a signal range proportional to the angular location of said swing arms about said preheating cylinder over an arc of less than 360.degree., the proportional range of said feedback signal corresponding to the proportional range of said velocity signal;
- C. comparator means for receiving and comparing said velocity and feedback signals;
- and
- D. logic means for emitting a second motor directional control signal according to the polarity of the difference between said velocity and feedback signals.
In a double facer corrugating machine having web preheating cylinders respective to each of a single faced corrugated web supply and a double face liner web supply, each of said preheating cylinders having wrap guide rollers secured at the distal end of swing arms journaled for rotation about respective preheating cylinder rotational axes, selective positionment of swing arms respective to each cylinder being simultaneously driven by power and transmission means, velocity signal generating means for emitting a velocity signal having a range proportional to the operating velocity range of one of said web supplies, wrap angle signal generating means for emitting a wrap angle signal having a range proportional to the angular location of swing arms respective to one of said cylinders about an operational arc, the range of said velocity signal corresponding to the range of said wrap angle signal, signal comparison means for comparing said velocity and wrap angle signals and emitting an error signal corresponding to the comparative difference therebetween, logic means for evaluating said error signal and emitting a corrective direction command signal, and power control means responsive to said direction command signal to actuate said power and transmission means to reposition swing arms respective to both of said preheating cylinders accordingly.
Dependencies are inferred from the claim text.