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公开(公告)号：AU1360883A
公开(公告)日：1984-01-05
申请号：AU1360883
申请日：1983-04-18
Applicant: IBM
Inventor： CARRINGTON JAMES EDWARD , HRYCK MICHAEL DAVID , SKINNER DEAN WILLIAM , WESTCOTT GERALD RALPH
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：BR8300058A
公开(公告)日：1983-09-20
申请号：BR8300058
申请日：1983-01-07
Applicant: IBM
Abstract: 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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Patent Agency Ranking
公开(公告)号：DE3279602D1
公开(公告)日：1989-05-18
申请号：DE3279602
申请日：1982-10-14
Applicant: IBM
Abstract: 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：DE3376365D1
公开(公告)日：1988-05-26
申请号：DE3376365
申请日：1983-05-19
Applicant: IBM
Inventor： CARRINGTON JAMES EDWARD , HRYCK MICHAEL DAVID , SKINNER DEAN WILLIAM , WESTCOTT GERALD RALPH
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：AU559438B2
公开(公告)日：1987-03-12
申请号：AU1360883
申请日：1983-04-18
Applicant: IBM
Inventor： CARRINGTON JAMES EDWARD , HRYCK MICHAEL DAVID , SKINNER DEAN WILLIAM , WESTCOTT GERALD RALPH
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：DE3167577D1
公开(公告)日：1985-01-17
申请号：DE3167577
申请日：1981-06-03
Applicant: IBM
Inventor： BOLCAVAGE RICHARD DONALD , HRYCK MICHAEL DAVID , KAUCZKA WILLIAM BERNARD , KINTER HAROLD BLAINE
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：DE2405315A1
公开(公告)日：1974-10-17
申请号：DE2405315
申请日：1974-02-05
Applicant: IBM
Inventor： GILBERT RICHARD LYMAN , HRYCK MICHAEL DAVID
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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