Plotter with pencil-lead detecting system

Details Plotter with pencil-lead detecting system Plotter with pencil-lead detecting system

1992-12-14

1994-10-11

Fuller, Benjamin R.

Recorders

Markers and/or driving means therefor

Stylus feature

33 181, G01D 1516, B43L 1300

Patent

active

053551575

ABSTRACT:
A preliminary sensor read unit (83A) performs preliminary sensor read for a movable ring (38) by using a sensor (29) with a pencil (20) set in an upper position. After the preliminary sensor read, a knock control unit (83B) performs a single lead-knocking operation for the pencil. After the lead-knocking operation, a determining sensor read unit (83C) performs determining sensor read for the movable ring by using the sensor, with the pencil set in the upper position. Using a determining threshold prepared on the basis of a sensor value obtained by the preliminary sensor read, a determining unit (83D) discriminates a difference between a sensor value of the determining sensor read and the sensor value of the preliminary sensor read and determines whether or not the length of the lead held by the movable ring has an effective value for plotting.

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