Plotting head for consumable marking material

Details Plotting head for consumable marking material Plotting head for consumable marking material

1974-10-30

1976-07-20

Hartary, Joseph W.

Recorders

Markers and/or driving means therefor

Stylus feature

33 18R, G01D 1524

Patent

active

039710360

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.

REFERENCES:
patent: 2316906 (1943-04-01), Wait
patent: 2375267 (1945-05-01), Wise
patent: 3293658 (1966-12-01), Sicking
patent: 3345640 (1967-10-01), Sicking
patent: 3398452 (1968-08-01), Little et al.

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