Boots – shoes – and leggings
Patent
1981-11-03
1986-01-28
Krass, Errol A.
Boots, shoes, and leggings
346 29, 318571, 318574, 364167, G05B 1918
Patent
active
045675651
ABSTRACT:
A pen-lift system is provided which can achieve high speed plotting while maintaining line definition of drafting quality. The system includes a pen-lift mechanism for raising and lowering the pen, a pressure control system in order to provide a constant pen force for different kinds of pens, a velocity controller for varying the vertical velocity of the pen in response to changes in platen height and relative lateral pen position, and a position controller for sensing the present pen height relative to the platen and for actuating the pen-lift mechanism to achieve the desired pen-lift heights for different plotting situations.
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Haselby Robert D.
Haugh Samuel R.
Stewart Lowell J.
Black Thomas G.
Hewlett--Packard Company
Krass Errol A.
Kundrat Douglas A.
Smith Joseph H.
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