Recorders – Record receivers and/or driving means therefor – Web
Patent
1978-09-28
1980-12-16
Miller, Jr., George H.
Recorders
Record receivers and/or driving means therefor
Web
318696, G01D 1524
Patent
active
042400830
ABSTRACT:
A strip-chart recorder, including a stepper motor for advancing a recording medium from a roll by a predetermined distance upon each step of the motor; and a recording duration controller coupled to the motor for controlling the frequency at which the motor is stepped. The recording duration controller includes a selector system for selectively varying the frequency at which the motor is stepped.
The selector system includes a timing circuit having a given number of outputs for providing timing pulses at different predetermined frequencies at different respective outputs; a like number of frequency selection circuits, each including a switch for selecting one of the predetermined frequencies, and a latch for providing an enabling signal in response to the actuation of the switch; and a logic circuit coupled to the timing means and the frequency selection circuits for providing a control signal for stepping the motor at the predetermined frequency associated with the enabling signal provided by the frequency selection circuit that includes the actuated switch. The latch continues to provide the enabling signal until the latch is reset. The frequency selection circuits are interconnected for causing a given one of the frequency selection circuits to provide its enabling signal whenever none of the switches of any of the frequency selection circuits has been selectively actuated.
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patent: 3991355 (1976-11-01), Reehil et al.
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patent: 4074275 (1978-02-01), Stires
patent: 4100470 (1978-07-01), Andrews
patent: 4112344 (1978-09-01), Klein
patent: 4112345 (1978-09-01), Goddijn
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