Coded data generation or conversion – Digital pattern reading type converter – Optical
Patent
1990-08-20
1993-08-24
Logan, Sharon D.
Coded data generation or conversion
Digital pattern reading type converter
Optical
341 6, 341 11, H03M 130
Patent
active
052392970
ABSTRACT:
A position-encoded screw, and a method and system for calibrating a position-encoded screw. In one embodiment, the screw includes a threaded portion and a set of position-encoding marks arranged along a spiral path around the threaded screw portion. To calibrate the screw, a set of sensors detects each mark as the screw is incrementally advanced past the sensors, and the absolute position of the screw is independently measured using an auxiliary device such as a precision electro-optic scale. The output of the sensor set is processed to generate encoded position signals representing encoded displacements of the screw relative to a known position. A set of the independently generated absolute position signals, one corresponding to each encoded position signal, is stored in the form of a look-up table, so that each absolute position signal may be read from the table in response to a corresponding encoded position address signal. The look-up table may be used with the screw by advancing the screw relative to a nut which includes a set of position sensors until the screw reaches a fixed position. Screw position signals generated by the sensors are processed to generate an encoded position signal corresponding to the fixed position. An accurate position of the screw is determined by reading an absolute position signal from the table which corresponds to the encoded position signal.
REFERENCES:
patent: 1167644 (1916-01-01), Jacques, Sr.
patent: 2613445 (1952-10-01), Zuckerman
patent: 3028589 (1962-04-01), Broadwell
patent: 3293759 (1966-12-01), Moe et al.
patent: 3465269 (1969-09-01), Hendershot
patent: 3705400 (1972-12-01), Cordes, Jr.
patent: 3742488 (1973-06-01), Von Voros
patent: 3768094 (1973-10-01), Henrich
patent: 3794814 (1974-02-01), Lay et al.
patent: 4103427 (1978-08-01), Ledley, III
patent: 4218823 (1980-08-01), Matsumoto et al.
patent: 4488051 (1984-12-01), Brown et al.
patent: 5012239 (1991-04-01), Griebeler
LandOfFree
Position-encoded screw and method and system for calibrating a p does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Position-encoded screw and method and system for calibrating a p, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Position-encoded screw and method and system for calibrating a p will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-832182