Registers – Transfer mechanism – Traveling pawl
Patent
1976-08-19
1977-09-06
Wise, Edward J.
Registers
Transfer mechanism
Traveling pawl
177 25, 340347P, 23515131, 235 92WT, 328 41, G01G 300, H03K 2100
Patent
active
040470075
ABSTRACT:
A system for processing cyclic signal pairs generated by an optical transducer to provide an accurate measurement of the displacement of one member with respect to a reference is suitable for determining weight by measuring spring scale tare deflection. The system includes a pair of comparator Schmitt trigger circuits for shaping pulse waveform signals. The pulse signals are processed by fully clocked digital circuits including edge discriminators to generate multiple count pulses which are processed by combination logic for direction determination. Further processing includes sign determination (positive-negative) and zero identification circuits to provide up and down pulses which are filtered and fed to up/down counter stages. Counter stage information is decoded for feedback control and processing logic indication. The zero identification circuit facilitates an unambiguous zero reference indication by skipping one count at zero to provide a display sign change indication on either side of zero prior to incrementing display counts to better define true zero as an edge or line between successive displays rather than as a zone. In an alternate embodiment, zero transition indicators are provided by feeding the count pulses directly to an updown counter and utilizing the most significant counter bit to invert the counter outputs upon a transition through actual zero.
REFERENCES:
patent: 3487399 (1969-12-01), Wogatzke
patent: 3665169 (1972-05-01), Henderson et al.
patent: 3763362 (1973-10-01), Griem, Jr.
patent: 3913095 (1975-10-01), Dlugos
patent: 3927309 (1975-12-01), Fujiwara et al.
patent: 3973109 (1976-08-01), Foster
patent: 3997769 (1976-12-01), Hansmann
Dlugos Daniel F.
Manduley Flavio M.
Pitney-Bowes Inc.
Salzman Robert S.
Scribner Albert W.
Soltow, Jr. William D.
Wise Edward J.
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