Document reproduction machine with enhanced book copying capabil

Details Document reproduction machine with enhanced book copying capabil Document reproduction machine with enhanced book copying capabil

1990-05-22

1990-12-25

Grimley, A. T.

Photocopying

Contact printing

Light boxes

355 25, 355 69, G03G 1528

Patent

active

049807200

ABSTRACT:
A book copying mode of operation is presented which utilizes a height detector device associated with the scan mechanism to obtain a series of output signals representing changes in the distance between the scan mirror and the book pages being copied. As the book page is characteristically tend to be lifted away from the platen towards the central spine area, a distance designated as .DELTA.z is formed between the platen and the book page. A profile of this changing distance .DELTA.z is captured and electronically stored in computer memory. A controller then processes the stored signal to provide compensating signals for the errors in the projected image resulting from the changing .DELTA.z. Thus, the angular misalignment of the object image plane is corrected by causing the scan mirror to pivot during scan so as to maintain the proper orientation vis-a-vis sloping book pages. Also, the change in object conjugate caused by the increase in .DELTA.z is corrected by increasing the speed of the 1/2 rate mirror to shorten the relative distance between the full rate mirror and the 1/2 rate mirror. In one embodiment all the correction signals are generated during a pre-scan excursion with the correction signals applied by the controller during imaging scan.

REFERENCES:
patent: 3630612 (1971-12-01), Lehovec
patent: 3775008 (1973-11-01), Schaeffer et al.
patent: 4659207 (1987-04-01), Maekawa
patent: 4711554 (1987-12-01), Nishimori
patent: 4716439 (1987-12-01), Acquaviva
patent: 4924265 (1990-05-01), Partilla et al.
patent: 4935772 (1990-06-01), Wakui et al.

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