Method and apparatus for adjusting read start position of docume

Details Method and apparatus for adjusting read start position of docume Method and apparatus for adjusting read start position of docume

1990-11-15

1993-09-14

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Facsimile measuring, testing, or calibrating

358488, 358496, 250561, H04N 100

Patent

active

052454401

ABSTRACT:
An apparatus for adjusting a read start position of a document to be read is provided. A read unit has at least a transportation element for transporting the document to be read. A detection switch detects a top of the document, and an optical read unit reads the document. A control unit has a memory for storing a reference read start time and a corrected read start time. A timer counts the reference read start time, and a correction unit corrects the reference read start time. The control unit corrects the reference read start time in such a way that, in a read position adjusting mode set prior to an actual read operation of the document, a test chart is inserted into the transportation element. An actual read line provided on the test chart is detected and an error is obtained between the actual read line and a reference read line provided on the test at an angle to the actual lead line is obtained. A time lag is calculated from this error and the reference read start time is corrected based on the time lag.

REFERENCES:
patent: 4605970 (1986-08-01), Hawkins
patent: 4675741 (1987-06-01), Shinohara
patent: 4686577 (1987-08-01), Arimoto
patent: 4709147 (1987-11-01), Arai
patent: 5138144 (1992-08-01), Sakamoto

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