Pen and ink supply tube assembly for plotters and the like

Details Pen and ink supply tube assembly for plotters and the like Pen and ink supply tube assembly for plotters and the like

1995-07-21

2000-12-12

Barlow, John

Recorders

Markers and/or driving means therefor

With ink supply to marker

G01D 1516

Patent

active

061605638

ABSTRACT:
A coiled ink supply tube for an X, Y plotter and the like is connected between an ink reservoir and a pen mounted within a pen holder and moveable with the pen holder between a raised non-drawing position and a lowered drawing position for drawing lines or graphics on receiving surfaces. The ink supply tube defines a preformed coil having 11/4 turns or windings in the form of a helix with substantially zero spacing between turns. The ink supply tube also defines a straight inlet section coupled between the coil and the reservoir and oriented parallel to the axis of the coil, and a straight outlet section substantially coaxial with a vertical axis of the pen and lying in a plane substantially perpendicular to the axis of the coil. As the pen moves up and down between the raised non-drawing and lowered drawing positions, the diameter of the helical coil changes very little and substantially no lateral forces are imposed by the ink supply tube on the pen. Similarly, the coiled ink supply tube presents a slight and substantially uniform vertical resistance to the pen throughout each cycle of the pen's up and down movement.

REFERENCES:
patent: 3213460 (1965-10-01), Gilovich
patent: 3335424 (1967-08-01), Hartai
patent: 4484202 (1984-11-01), Sayko
patent: 4749314 (1988-06-01), LeBlond
patent: 5489931 (1996-02-01), Shibata et al.
patent: 5602577 (1997-02-01), Shibata et al.

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