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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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公开(公告)号：AU552177B2
公开(公告)日：1986-05-22
申请号：AU1193083
申请日：1983-03-01
Applicant: IBM
Inventor： CARRINGTON JAMES EDWARD , WESTCOTT GERALD RALPH
Abstract: A hammer limit control for an on-the-fly line printer comprises a counter which counts compare signals from a compare circuit which detects coincidences of print data and type position data in synchronism with the motion of an endless type carrier. The counter maintains a running count of the number of compare signals for a control interval having a duration which is a function of the printing interval of a print line cycle. A hammer on storage device stores a plurality of compare counts registered by the counter at the end of each of a plurality of control intervals. An adder adds the running count registered in the counter to the total count stored in the storage means and stores the total sum in a hammer on register. When the total sum in the hammer on register equals a maximum number, a limit comparator generates a control signal which inhibits further comparisons by the compare circuit. The content of the hammer on storage device is updated each control interval by transferring the compare count registered in the compare counter to the storage device and by deleting the oldest count in the hammer on storage after a predetermined number of control intervals. The maximum number is stored in a register which is programmable.
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公开(公告)号：BR8300891A
公开(公告)日：1983-11-16
申请号：BR8300891
申请日：1983-02-24
Applicant: IBM
Inventor： CARRINGTON JAMES EDWARD , WESTCOTT GERALD RALPH
IPC: B41J9/00
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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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Patent Agency Ranking
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：DE3371128D1
公开(公告)日：1987-05-27
申请号：DE3371128
申请日：1983-11-03
Applicant: IBM
Inventor： CARRINGTON JAMES EDWARD , WESTCOTT GERALD RALPH
Abstract: This control system for a multispeed/multipitch line printer basically comprises two read/write memories called the Band Image Buffer (19) and the Print Line Buffer (17). The Band Image Buffer (19) is loaded with the character image of the print band or chain (10) and can be visualized as an electronic band running in synchronism with the type carrier (10). The Print Line Buffer (17) is loaded with a line of data to be printed. Both buffers (17, 19) are read during each option time of a print subscan, their contents are compared in a comparator (47)-which controls the hammer firing circuits (51, 53)-, and their respective address registers (23, 22) are modified to a new value at the end of each subscan. A control bit is stored in a check buffer (20) to detect the end of each subscan. Comparison of the contents of the Band Image and Print Line Buffers (19, 17) continues until the control bit is detected signifying that a Band Image Buffer correction cycle followed by a Print Line Buffer correction cycle should be performed.
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公开(公告)号：AU2015983A
公开(公告)日：1984-07-05
申请号：AU2015983
申请日：1983-10-13
Applicant: IBM
Inventor： CARRINGTON JAMES EDWARD , WESTCOTT GERALD RALPH
Abstract: This control system for a multispeed/multipitch line printer basically comprises two read/write memories called the Band Image Buffer (19) and the Print Line Buffer (17). The Band Image Buffer (19) is loaded with the character image of the print band or chain (10) and can be visualized as an electronic band running in synchronism with the type carrier (10). The Print Line Buffer (17) is loaded with a line of data to be printed. Both buffers (17, 19) are read during each option time of a print subscan, their contents are compared in a comparator (47)-which controls the hammer firing circuits (51, 53)-, and their respective address registers (23, 22) are modified to a new value at the end of each subscan. A control bit is stored in a check buffer (20) to detect the end of each subscan. Comparison of the contents of the Band Image and Print Line Buffers (19, 17) continues until the control bit is detected signifying that a Band Image Buffer correction cycle followed by a Print Line Buffer correction cycle should be performed.
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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：DE3867170D1
公开(公告)日：1992-02-06
申请号：DE3867170
申请日：1988-07-29
Applicant: IBM
Inventor： CARRINGTON JAMES EDWARD , WESTCOTT GERALD RALPH
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