Method and apparatus for position referencing the rotating drum

Details Method and apparatus for position referencing the rotating drum Method and apparatus for position referencing the rotating drum

1975-11-14

1977-05-17

Habecker, Thomas B.

Communications: electrical

Systems

Call station

358127, G08C 1916

Patent

active

040245187

ABSTRACT:
A method and apparatus are disclosed for referencing the position of a rotatable drum in a scanner/plotter. The rotatable drum is rotatable held in axial alignment by means of a drum headstock and a spring loader, moving center tailstock. An optical shaft encoder provides a reference pulse for the headstock drum shaft and a plurality of drive shaft position pulses. The rotatable drum has a magnetic pellet mounted thereon. A magnetic transducer is positioned with respect to the predetermined drive shaft position to detect the presence of the drum pellet. As the drum rotates, the transducer detects the pellet and produces an output signal which is used to electronically cross-reference the drum pellet to the predetermined drive shaft position.

REFERENCES:
patent: 784393 (1905-03-01), Grabosch
patent: 2740952 (1956-04-01), Jacobs
patent: 2770798 (1956-11-01), Roth
patent: 2775755 (1956-12-01), Sink
patent: 2970302 (1961-01-01), Gridley
patent: 3261007 (1966-07-01), Frisch
patent: 3262105 (1966-07-01), Bell
patent: 3745544 (1973-07-01), Ono

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