EARLE M CHASE
Engineering in Wilbraham, MA
License number
Massachusetts 15440
Expiration Date
Jun 30, 1984
Type
Mechanical Engineer
Address
Address
Wilbraham, MA 01095
Professional information
Plotting Head For Consumable Marking Material
US Patent:
3971036, Jul 20, 1976
Filed:
Oct 30, 1974
Appl. No.:
5/519072
Inventors:
Heinz Joseph Gerber - West Hartford CT
Earle Merritt Chase - Wilbraham MA
Earle Merritt Chase - Wilbraham MA
Assignee:
The Gerber Scientific Instrument Company - South Windsor CT
International Classification:
G01D 1524
US Classification:
346139C
Abstract:
A plotting head is provided for a slender shaft of consumable marking material, such as pencil lead or graphite, which is capable of producing uniform line intensity at any plotting speed as long as a light stylus pressure is applied to the shaft. The head includes a magazine capable of storing a plurality of such shafts, a feed mechanism for advancing the shaft of marking material as it is consumed during a plotting operation, and an indexing mechanism for rotating the magazine and placing a new shaft of marking material in registration with the feed mechanism each time a shaft is substantially consumed. A torque motor in the feed mechanism maintains a substantially uniform stylus pressure on the shaft when line traces are being drawn and also energizes the indexing mechanism to bring a new shaft of marking material into the plotting position when the old shaft is substantially consumed.