-
公开(公告)号：US3509474A
公开(公告)日：1970-04-28
申请号：US3509474D
申请日：1967-11-09
Applicant: IBM
Inventor： ARNOLD ROBERT W , GREESON JAMES C JR
CPC classification number: G06G7/25
-
公开(公告)号：US3609565A
公开(公告)日：1971-09-28
申请号：US3609565D
申请日：1969-12-29
Applicant: IBM
Inventor： ARNOLD ROBERT W
CPC classification number: G01R19/30 , G01R19/0038 , G06G7/25
Abstract: A system for identifying and selecting the maximum or minimum value signal from among a plurality of signals. The system includes an amplifier for each input signal. The outputs of the amplifiers are connected to a common load through individual diodes. A negative feedback connection is provided from the load to an amplifier input. The polarity of the voltage drop across the diodes is monitored to determine the diode which is forward biased. This indicates the amplifier with the extreme valued input signal. A second set of diodes across the amplifiers limits the output voltage to reduce overload conditions.
-
-
Patent Agency Ranking
公开(公告)号：CA1172341A
公开(公告)日：1984-08-07
申请号：CA399141
申请日：1982-03-23
Applicant: IBM
Inventor： ARNOLD ROBERT W , SKINNER DEAN W
Abstract: CONSTANT ENERGY DRIVE CIRCUIT FOR ELECTROMAGNETIC PRINT HAMMERS A constant energy drive circuit comprises two interconnected chopping circuits successively operable to control the current in a coil of an electromagnetic actuator. One chopping circuit operates during the rise time portion of the operating interval, the other operates beginning with the occurrence of a predetermined peak current and for remainder of the operating interval of fixed duration.
-
公开(公告)号：CA1169142A
公开(公告)日：1984-06-12
申请号：CA399140
申请日：1982-03-23
Applicant: IBM
Inventor： ARNOLD ROBERT W
Abstract: CONSTANT ENERGY DRIVE CIRCUIT FOR ELECTROMAGNETIC PRINT HAMMERS A constant energy drive circuit for an electromagnetic print hammer has a chopping circuit including a comparator which cycles a switch connecting the energizing coil of the print hammer to an unregulated power supply. Changes in the drive voltage of the unregulated source are compensated for by altering the switching rate of the switch by adjusting the amplitude of a reference signal applied to the comparator. The reference signal adjustment is inverse to changes in the drive voltage.
-
公开(公告)号：CA1143785A
公开(公告)日：1983-03-29
申请号：CA335624
申请日：1979-09-14
Applicant: IBM
Inventor： ARNOLD ROBERT W , GALETTO LOUIS V
Abstract: ANALOG DC MOTOR VELOCITY CONTROL LOOP A pulse width modulated DC motor control system is designed to operate a DC motor at constant velocity. Feedback pulses generated at a rate proportional to the rotational velocity of the motor are converted to control pulses having a fixed on-time period which is independent of changes in the velocity of the motor. The control pulses are used to modulate a constant current source whose output is integrated to generate a sawtooth voltage signal whose average DC value is used as the basis for pulse width modulating a DC voltage applied to the motor drive circuits of a DC motor. EN977026
-
公开(公告)号：CA1085903A
公开(公告)日：1980-09-16
申请号：CA287431
申请日：1977-09-26
Applicant: IBM
Inventor： ARNOLD ROBERT W , TOMASKY THOMAS
Abstract: METHOD AND APPARATUS FOR ADJUSTING THE VELOCITY OF INK DROPS IN AN INK JET PRINTER A servo system for adjusting the velocity of ink drops in a magnetic ink jet printer has a coarse control loop for making coarse increment adjustments to the pump which supplies ink under pressure to a nozzle and a fine control loop for making fine increment adjustments to the pressure of said pump. The velocity of the drops is determined by a pair of drop sensors located one drop wavelength apart at a fixed distance from the drop generation point. The direction of any phase error between pairs of drops is used to generate direction control signals applied to the coarse control loop until a reversal in phase error occurs. A toggle control allows the coarse control loop to make coarse adjustments in pump pressure around a null point velocity before switching direction control signals to the fine control loop.
-
-
-
-
-
-
-
Search Results
8
records
(took 0.017 seconds)
