Registers – Platform operated – Platform actuated traffic counters
Patent
1978-07-12
1980-10-21
Thesz, Joseph M.
Registers
Platform operated
Platform actuated traffic counters
235 92FP, 235 92PL, 235 92PE, 235 92MP, G06M 306
Patent
active
042296471
ABSTRACT:
An improved electronic counter for use with an incremental measuring device is disclosed. The counter includes two or more individual counters, a display unit, and a switch for selectively connecting any one of the individual counters with the display unit. Each of the individual counters may be individually set to a separate zero point so that each counter may be used to store a position value in a separate frame of reference. The position value stored in any one of the individual counters may be switched to the display unit without disturbing the contents of the other individual counters. In the preferred embodiment, the counter includes a circuit for automatically resetting a first individual counter to zero whenever the measuring device senses a predetermined reference mark, thereby automatically maintaining a calibrated zero point in that counter. The preferred embodiment also includes a power fail circuit which generates a warning signal when the measuring device is operated following an interruption in the line voltage used to power the device. This warning signal is maintained until the first individual counter is automatically reset, and the device is again calibrated for use.
REFERENCES:
patent: 3811648 (1974-05-01), Ream et al.
patent: 3872288 (1975-03-01), Sampey
patent: 3962563 (1976-06-01), Schulz-Methke
patent: 3982106 (1976-09-01), Stutz
patent: 4107516 (1978-08-01), Hvidsten
Dr. Johannes Heidenhain GmbH
Thesz Joseph M.
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