Printer, method for determining top edge of object to be...

Details Printer, method for determining top edge of object to be... Printer, method for determining top edge of object to be...

2006-01-10

2006-01-10

Chau, Minh (Department: 2854)

Typewriting machines

Sheet or web

Including skew correction responsive to position of sheet or...

C400S578000, C400S708000

Reexamination Certificate

active

06984082

ABSTRACT:
A printing apparatus comprises feeding means, light-emitting means, and a light-receiving sensor, and is capable of detecting a change in an output value of the light-receiving sensor that is caused by the medium to be printed, which has been fed by the feeding means, blocking the light, which has been emitted by the light-emitting means, wherein, by moving the light-emitting means and the light-receiving sensor in a main scanning direction, the printing apparatus detects, at a plurality of positions, changes in the output value that are caused by an upper or lower edge of the medium to be printed blocking the light, and based on a result of the detection, the printing apparatus obtains a position, in the feeding direction, of either one of a left edge or a right edge of the upper or lower edge that is fed leading or trailing the other in the feeding direction.

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