Writing instrument

Details Writing instrument Writing instrument

1991-03-07

1992-03-03

Fuller, Benjamin R.

Recorders

Markers and/or driving means therefor

Stylus feature

346 49, 33 181, G01D 1516, B43C 1300

Patent

active

050936727

ABSTRACT:
This device relates to graphics apparatus of the pen-plotter type comprising a plotter head which is moveable in a horizontal direction Y and supports a writing instrument which is vertically moveable (Z direction) on the head. Each writing instrument bears an identification surface the location of which along the Z direction depends on the instrument type. The apparatus further includes a fixed abutment. The instrument type is identified by detecting the vertical position of the instrument when the identification surface is brought into contact with the abutment. For greater accuracy, a differential measurement can be obtained between this vertical position and a reference position obtained by bringing a reference surface of the instrument into contact with a reference abutment.

REFERENCES:
patent: 4274102 (1981-06-01), Lum
patent: 4677572 (1987-06-01), Gunderson et al.
patent: 4849771 (1988-10-01), Lawrence et al.

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