Duplicate feeding detection device for sheet-like member

Details Duplicate feeding detection device for sheet-like member Duplicate feeding detection device for sheet-like member

2009-03-03

2011-11-01

McCullough, Michael (Department: 3653)

Sheet feeding or delivering

Feeding

By means to convey sheet

Reexamination Certificate

active

08047541

ABSTRACT:
A duplicate feeding detection device for use with sheet-like members may include a control part for controlling an ultrasonic transmission part, a duplicate feeding judging part for judging duplicate feeding of the sheet-like members on a basis of an output from an ultrasonic receiving part, a temperature measuring part for measuring temperature of a vicinity of the ultrasonic transmission part, and a memory part in which a relationship between an oscillation frequency of the ultrasonic transmission part and a temperature is stored. The control part sets an oscillation frequency corresponding to a temperature which is measured by the temperature measuring part on a basis of the relationship between the oscillation frequency and the temperature stored in the memory part.

REFERENCES:
patent: 4412147 (1983-10-01), Nagura et al.
patent: 2005/0275159 (2005-12-01), Yoshimura et al.
patent: 2006-1691 (2006-01-01), None
patent: 2006-298598 (2006-11-01), None

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