Writing instrument identification process and device

Details Writing instrument identification process and device Writing instrument identification process and device

1989-06-22

1991-12-03

Fuller, Benjamin R.

Recorders

Performance of multiple functions of steam and gas engines

Pressure responsive element

346139R, 346 49, G01D 1516

Patent

active

050703447

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: 4779104 (1988-10-01), Lawrence et al.

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