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公开(公告)号：CA1186782A
公开(公告)日：1985-05-07
申请号：CA416979
申请日：1982-12-03
Applicant: IBM
Inventor： DAYGER DOUGLAS A , HRYCK MICHAEL D , SKINNER DEAN W , WESTCOTT GERALD R
Abstract: CONTROL SYSTEM FOR TIMING HAMMERS OF IMPACT PRINTERS A hammer timing control system for a line printer has a register for continually storing a digital delay fire quantity representative of the actual flight of a controlled hammer. A delay fire counter activated by an initiate fire pulse from hammer selection circuitry of the printer control system counts the timing pulses from a clock means until it registers a count equal to the delay quantity stored in the delay fire register. A comparator circuit is connected to both the delay value register and the counter and generates a hammer fire signal when the delay quantity and the count are equal. The single counter continues counting clock pulses until a second count is registered which is equal to a terminate fire value. The control system provides circuit means responsive to the second count registered in the counter to terminate the hammer fire signal. In one embodiment, the terminate fire circuitry comprises a decode connected to the output of the counter means for detecting the second count condition. In a second embodiment, the control system has a second register which stores a terminate fire quantity which represents a fixed time after the initiate fire signal and prior to hammer impact. In a third embodiment, the counter is an up/down counter which counts in one direction to turn on the hammer driver circuit and in the other direction to turn off the hammer driver circuit. The delay fire quantities for the plurality of hammers are preferably stored in an external memory device for transfer to the individual registers for each of the print hammers. The external storage may be a magnetic record such as a disk.
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公开(公告)号：CA1019249A
公开(公告)日：1977-10-18
申请号：CA193591
申请日：1974-02-27
Applicant: IBM
Inventor： GILBERT RICHARD L , HRYCK MICHAEL D
Abstract: Print hammers in a printer are energized from a source of electrical energy whose voltage may vary. The motor driving the type carrier is energized from an oscillator whose frequency is caused to vary with the voltage of the print hammer source to prevent misregistration between the print hammers and the type characters on the type carrier. The duration of the pulses energizing the print hammers is controlled by print scan pulses derived from timing marks on the type carrier to provide constant print density.
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公开(公告)号：BR8303129A
公开(公告)日：1984-01-31
申请号：BR8303129
申请日：1983-06-13
Applicant: IBM
Abstract: @ The control system for a line printer includes compensation circuit means (29) for electronically changing the timing of the reference or home pulse to compensate for changes in the speed of the type characters (16) on a continuous type carrier (10).,The compensation circuit includes a storage register, a counter and a comparison circuit for comparing the content of the storage register and the counter. The counter when activated by a reference pulse generated from a reference mark on the moving type carrier (10) counts subscan pulses generated from timing marks moving with the type characters. The storage register, which is programmable, stores different numeric values dependent on the speed of the type carrier representing different numbers of subscan pulses to be counted by the counter means. The comparator circuit compares the numeric value in the register with the count registered in the counting means. When an equality is detected, the comparator circuit generates a modified reference or sync pulse which is applied to sync control circuitry (41) which checks the character signal produced by the type position circuitry of the printer controls.
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公开(公告)号：CA981588A
公开(公告)日：1976-01-13
申请号：CA193590
申请日：1974-02-27
Applicant: IBM
Inventor： GILBERT RICHARD L , HRYCK MICHAEL D , MAKO JOHN
Abstract: 1435846 Automatic control of printing INTERNATIONAL BUSINESS MACHINES CORP 15 Feb 1974 [5 March 1973] 6902/74 Heading G3N A selective printer comprises a control means for a motor moving a type carrier adapted to vary the speed of the motor in accordance with variations in the value of a common source of energy for the control means and a hammer operating means so as to maintain registration between print hammers and type characters. As shown, an endless type-belt 12 carries type characters 16 on fingers 18 and is driven by a pulley 14 coupled to a stepping motor 30. A plurality of print hammers, such as 22, are electromagnetically actuated by windings 23 energized in timed relationship with marks 20 on the belt. as sensed by a photo-electric device 20 and controlled by a device 24. The motor 30 is stepped by pulses from a device 32. Since the flight-time of a print hammer is related to the voltage applied to the windings 23, the pulse rate of the pulses applied to the motor 30 is varied in correspondence by deriving the pulses from a relaxation oscillator, the charge/ discharge capacitor being fed through a voltage dependent transistor-diode circuit. A gradual initial start-up is provided by biasing the transistor by a ramp generator. The pulses are gated to the stepping-motor windings by a binary counter.
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Patent Agency Ranking
公开(公告)号：FR2291636A1
公开(公告)日：1976-06-11
申请号：FR7518138
申请日：1975-06-03
Applicant: IBM
Inventor： GILBERT RICHARD L , HRYCK MICHAEL D , MAKO JOHN
Abstract: The control circuit is used for regulating the movement of a step by step motor having several active windings which are all connected so as to be sequentially exited by selectively actuated switching means. The system includes a series of voltage controlled oscillator circuits which are connected so as to activate the switching means at given time intervals. Also, it has means which function is response to the counter electromotive force which is produced by the active windings. The latter means are connected so as to vary the frequency of the oscillators in response to the variations of the counter electromotive force.
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公开(公告)号：DE2404799A1
公开(公告)日：1974-09-19
申请号：DE2404799
申请日：1974-02-01
Applicant: IBM
Inventor： GILBERT RICHARD L , HRYCK MICHAEL D , MAKO JOHN
Abstract: 1435846 Automatic control of printing INTERNATIONAL BUSINESS MACHINES CORP 15 Feb 1974 [5 March 1973] 6902/74 Heading G3N A selective printer comprises a control means for a motor moving a type carrier adapted to vary the speed of the motor in accordance with variations in the value of a common source of energy for the control means and a hammer operating means so as to maintain registration between print hammers and type characters. As shown, an endless type-belt 12 carries type characters 16 on fingers 18 and is driven by a pulley 14 coupled to a stepping motor 30. A plurality of print hammers, such as 22, are electromagnetically actuated by windings 23 energized in timed relationship with marks 20 on the belt. as sensed by a photo-electric device 20 and controlled by a device 24. The motor 30 is stepped by pulses from a device 32. Since the flight-time of a print hammer is related to the voltage applied to the windings 23, the pulse rate of the pulses applied to the motor 30 is varied in correspondence by deriving the pulses from a relaxation oscillator, the charge/ discharge capacitor being fed through a voltage dependent transistor-diode circuit. A gradual initial start-up is provided by biasing the transistor by a ramp generator. The pulses are gated to the stepping-motor windings by a binary counter.
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公开(公告)号：CA1179889A
公开(公告)日：1984-12-27
申请号：CA425350
申请日：1983-04-06
Applicant: IBM
Inventor： CARRINGTON JAMES E , HRYCK MICHAEL D , SKINNER DEAN W , WESTCOTT GERALD R
Abstract: HOME PULSE COMPENSATION FOR MULTIPLE SPEED LINE PRINTER The control system for a line printer includes compensation circuit means for electronically changing the timing of the reference or home pulse to compensate for changes in the speed of the type characters on a continuous type carrier. The compensation circuit includes a storage register, a counter and a comparison circuit for comparing the content of the storage register and the counter. The counter when activated by a reference pulse generated from a reference mark on the moving type carrier counts subscan pulses generated from timing marks moving with the type characters. The storage register, which is programmable, stores different numeric values dependent on the speed of the type carrier representing different numbers of subscan pulses to be counted by the counter means. The comparator circuit compares the numeric value in the register with the count registered in the counting means. When an equality is detected, the comparator circuit generates a modified reference or sync pulse which is applied to sync control circuitry which checks the character signal produced by the type position circuitry of the printer controls. EN981003
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公开(公告)号：AU534543B2
公开(公告)日：1984-02-02
申请号：AU7163281
申请日：1981-06-11
Applicant: IBM
Inventor： BOLCAVAGE RICHARD D , HRYCK MICHAEL D , KAUCZKA WILLIAM B , KINTER HAROLD B
Abstract: A method and apparatus for testing print elements of a printer, such as a belt printer, in which the print element operating circuits are energized at an energy level insufficient to cause printing but sufficient to generate feedback signals for checking operativeness by a microprocessor.
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公开(公告)号：CA1149310A
公开(公告)日：1983-07-05
申请号：CA378641
申请日：1981-05-29
Applicant: IBM
Inventor： BOLCAVAGE RICHARD D , HRYCK MICHAEL D , KAUCZKA WILLIAM B , KINTER HAROLD B
Abstract: A method and apparatus for testing print elements of a printer, such as a bell printer, in which the print element operating circuits are energized at an energy level insufficient to cause printing but sufficient to generate feedback signals for checking operativeness by a microprocessor.
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