Plotter with pencil-lead detecting system
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United States of America Patent
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Oct 11, 1994
Grant Date -
N/A
app pub date -
Dec 14, 1992
filing date -
Dec 25, 1991
priority date (Note) -
Expired
status (Latency Note)
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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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