Method and apparatus for controlling the braking system for an u

Winding – tensioning – or guiding – Coil holder or support – Spool or core

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B65H 2522

Patent

active

042867576

ABSTRACT:
A brake control system for an unwinder measures the line speed of the moving web and the rpm of the roll and produces electrical output signals proportional to each, which signals are operated upon to produce a main brake control signal to apply a braking force proportional to the roll diameter as it is constantly decreasing, and a further output signal which is proportional to the energy in the roll based on the calculation of the cube of the diameter of the roll so that required braking force modification will occur during acceleration and deceleration of the web in order to maintain essentially constant web tension. An additional feedback from a web tension measuring device is also provided which adjusts the braking force to produce an actual tension equal to the desired tension which has been included in the main braking force output signal proportional to the roll diameter.

REFERENCES:
patent: 2974893 (1961-03-01), Aaron
patent: 2974894 (1961-03-01), Aaron
patent: 3057574 (1962-10-01), Justus
patent: 4199118 (1980-04-01), Tetro

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