Automatic pencil apparatus for an automated drafting system

Details Automatic pencil apparatus for an automated drafting system Automatic pencil apparatus for an automated drafting system

1975-07-17

1977-03-29

Hartary, Joseph W.

Recorders

Markers and/or driving means therefor

Stylus feature

33 18R, 401 65, G01D 1524

Patent

active

040152693

ABSTRACT:
An automatic pencil apparatus for use with an automated drafting system comprises a gripping mechanism for releasably gripping a lead and comprised of a cylindrical tube, and a collet mounted for longitudinal movement in the tube for gripping and releasing the lead. A driving mechanism including an electromagnet selectively drives the gripping mechanism to actuate the collet and release the lead so that a drawing operation can be carried out. A pneumatic cylinder applies a predetermined constant pressure to the lead while in its released state thereby pressing the lead into contact with a drafting paper under constant pressure so that high quality lines can be drawn throughout consumption of the lead and independent of lead wear.

REFERENCES:
patent: 3293658 (1966-12-01), Sicking
patent: 3345640 (1967-10-01), Sicking
patent: 3541579 (1970-11-01), Von Hippel
patent: 3857525 (1974-12-01), Gerber et al.

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