Image forming member drive device of an automatic drawing appara

Details Image forming member drive device of an automatic drawing appara Image forming member drive device of an automatic drawing appara

1989-02-03

1991-08-27

Cuchlinski, Jr., William A.

Geometrical instruments

Scriber

346139R, 33 323, G01D 1524

Patent

active

050421557

ABSTRACT:
An image forming member, e.g. a pen or a cutter (for cutting image patterns), which member requires to be lowered onto and applied with a given pressure to a writing surface, is controlled in two modes. In a position control mode, the image forming member is controlled by means of a closed loop circuit by which it is lowered and positioned at a very small distance off of the writing surface. In accordance with a second, pressure control mode, the image forming member is controlled by means of an open loop circuit. With the aid of the open loop circuit the member is lowered and then applied with a given pressure to the writing surface. Thus, accurate and rapid controlling of such an image forming member is achieved.

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patent: 4683476 (1987-07-01), Ferrari et al.
patent: 4825555 (1989-05-01), Murayama et al.

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