Method of detecting residual amount of web roll

Details Method of detecting residual amount of web roll Method of detecting residual amount of web roll

1992-03-27

1994-01-18

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

226 11, 226100, 242 57, G08B 2100

Patent

active

052802744

ABSTRACT:
A method of measuring and expressing the unwound amount or residual amount of a web roll, such as carbon film roll or printing paper roll in terms of a unit length of the web roll includes the steps of: starting a count of pulses to be produced by a rotation displacement detecting sensor for each predetermined angle of rotational displacement when the residual amount of the web roll is considered to have been reduced to a predetermined value; and emitting a warning signal when the count reaches a predetermined count number (initially set on the basis of the average value of the amounts of unwinding rotation of the web roll per unit length) during the time when the web roll is unwound and fed by a unit length from the count start time.

REFERENCES:
patent: 3820101 (1974-06-01), Bolick, Jr.
patent: 4157575 (1979-06-01), Satoh et al.
patent: 4204180 (1980-05-01), Usui et al.
patent: 4338645 (1982-07-01), Mohri et al.
patent: 4970531 (1990-11-01), Shimizu et al.
patent: 4994851 (1991-02-01), Iwai

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