Device for estimating a size of an original document

Details Device for estimating a size of an original document Device for estimating a size of an original document

1995-01-10

1996-07-30

Ramirez, Nestor R.

Photocopying

Contact printing

Light boxes

355233, G03G 2100

Patent

active

055417132

ABSTRACT:
An original document size estimating device includes a first optical sensor and a second optical sensor operable to detect an original document placed on a specified position. The first optical sensor is positioned before the second optical sensor with respect to a forward direction. The first and second optical sensors are moved in both the forward direction and a backward direction opposite to the forward direction by a driver. The driver is controlled in such a manner as to forcibly move the first and second optical sensors in the forward direction further a predetermined additional distance when the first optical sensor generates absence signal and the second optical sensor generates presence signal, and return them after both generating absence signal to measure a length of the original document for size estimation.

REFERENCES:
patent: 4456372 (1984-06-01), Yamauchi
patent: 4814833 (1989-03-01), Matsushita et al.
patent: 4974022 (1990-11-01), Nezu
patent: 5119130 (1992-06-01), Tsudaka et al.

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