Walter Hvostik from Berwyn, IL, age 76

Walter Hvostik Phones & Addresses

Strip Chart Recorder
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US Patent:

44266510, Jan 17, 1984
Filed:

Mar 3, 1982
Appl. No.:

6/354406
Inventors:

William C. Muellner - LaGrange IL
Walter Hvostik - Berwyn IL
Assignee:

The Perkin-Elmer Corporation - Norwalk CT
International Classification:

G01D 1524
US Classification:

346136
Abstract:

An improvement to a chart recorder where the chart paper is driven by a motor responsive to pulses counted by a microprocessor makes it possible for the operator to return the pen at any time to the starting point of the last chart scan by merely pressing a key. Using a programmed counter the microprocessor keeps track constantly of the number of counts since the start of the scan. On key command the microprocessor directs the motor to return through this number of counts plus 50; then to go forward 50 counts thus taking up any backlash in the chart drive so as to return exactly to the initial point of the scan. The subroutine also raises the pen during return and lowers it at the starting point.