Dual-resolution encoding system for high cyclic accuracy of prin

Details Dual-resolution encoding system for high cyclic accuracy of prin Dual-resolution encoding system for high cyclic accuracy of prin

1994-01-31

1997-01-28

Barlow, Jr., John E.

Incremental printing of symbolic information

Ink jet

Medium and processing means

347 16, 400708, 271272, 271275, B41J 201

Patent

active

055982018

ABSTRACT:
The invention uses two very inexpensive rotary encoders in combination--a close-coupled one (or more) for high accuracy, and a remote-coupled one for high resolution. High-accuracy information is then combined with high resolution information in a digital processing system to yield composite information that is high in both accuracy and resolution. This information can be used to establish image positioning on a print medium. The overall system cost is lower than with an equivalent single encoder. Insidious cyclical errors in the coupling system (gear train or the like) are removable without expensive high tolerances and assembly or test fixtures. Residual cyclical error due to eccentric mounting or other error in the direct-coupled encoder scale also can be substantially removed, if desired, by adding another one or more encoders reading that scale, and suitably combining the information about that scale from the different sensors. The information is combined in such a way that the systematic cyclical errors cancel--or are quantified for use in explicit correction.

REFERENCES:
patent: 4734868 (1988-03-01), DeLacy
patent: 5276466 (1994-01-01), Tsukada et al.
patent: 5404020 (1995-03-01), Cobbs

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