Device for sensing a recording medium in a line printer

Details Device for sensing a recording medium in a line printer Device for sensing a recording medium in a line printer

1984-12-05

1987-01-27

LaRoche, Eugene R.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250223R, G01N 904

Patent

active

046396071

ABSTRACT:
The present invention is directed to a sensing device for a printing apparatus which has a printing head that moves line-wise along a recording medium that is conducted across a reflective surface. The sensing device includes a source of radiation projected onto an area of the reflective surface adjacent to the area or spot of printing and a radiation receiving device for receiving a reflected beam of radiation from the spot, which receiving device has a convergent lens system positioned in the path of the reflected beam of radiation and positioned with the focal point being approximately at the reflective spot or area so that the lens system directs beams deflected from the desired path onto the receiving surface due to deformations in the reflective surface.

REFERENCES:
patent: 3739177 (1973-06-01), Ko

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