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公开(公告)号：DE2800416A1
公开(公告)日：1978-08-17
申请号：DE2800416
申请日：1978-01-05
Applicant: IBM
Inventor： GALETTO LOUIS VALENTINE , JENSEN DONALD FREDERICK
Abstract: In a magnetic ink jet printer a continuous stream of ferrofluid ink drops is projected toward a print medium. A magnetic selector located proximate the stream is operated in synchronism with the flight of the ink drops for deflecting individual unwanted ink drops into a drop catcher. Due to fringing effects produced by the selector when unwanted drops are selected, adjacent print drops are deflected a lesser amount from the initial stream trajectory. Print drops not affected by the fringe magnetic field produced to select unwanted drops are subjected to a compensation deflection depending on their position relative to the unwanted drops so that all print drops follow the same trajectory, after passing the magnetic selector in their travel through a vertical deflector and deposition onto the print medium.
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Patent Agency Ranking
公开(公告)号：DE3273241D1
公开(公告)日：1986-10-16
申请号：DE3273241
申请日：1982-12-02
Applicant: IBM
Inventor： GALETTO LOUIS VALENTINE , RAKES JAMES MITCHELL
Abstract: Control circuit for selectively energizing individual wires (20) in an electroerosion printhead for forming marks on metal coated paper (4). Including a plurality of wires (20) arranged in M groups having an equal number N of wires. … It comprises M selector transistors (22) for selecting a group M of wires; N transistor switches (36) for selecting individual wires in a group M; means for generating a first current (I1 = V2/R2) from ground through the metal coated paper and each non-selected wire to make a mark; and means for generating a second current (I2 = V1/R1) bypassing the paper wire junction to avoid making a mark.
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公开(公告)号：DE3266498D1
公开(公告)日：1985-10-31
申请号：DE3266498
申请日：1982-05-14
Applicant: IBM
Inventor： GALETTO LOUIS VALENTINE , ROSS CHARLES OWEN
Abstract: 1. Apparatus for processing serial scan dotline data of a display device with a screen consisting of several scan dot lines for recording by a matrix printer on a record carrier, characterized in that the matrix printer comprises, in a manner known per se, a print head (17) with a left-hand and a right-hand column with respectively equidistant print elements (17), the print element columns being staggered relative to each other in such a manner that in a recording process where the print head and the record carrier are moved relative to each other in a line pass each print element prints one of p dot scan print lines with n scan dots each, that a randomly addressable memory (62) is provided to process the printing data, that the memory (62) is divided into an area (63) associated to the left-hand print element column, and an area (64) associated to the right-hand print element column, that each storage area (63, 64) is divided into successive fields, each field being associated to a print position of the print head on the record carrier for a recording pass, that each bit of a field is associated to a predetermined print element, that successively, with microprocessor (20) and counter control (37, 47), p scan dots are selected of each k-th screen line (k = 1, 2, 3, 4 to n) and transferred into a register (53A, 53B) with p stages, each register stage being associated to a print element in order to form, for each dot scan print line associated to the print head for a recording pass and to be recorded subsequently, the k-th bit information, that the contents of the register stages are transferable separately under clock control via gates (54A, 54B) for each print element column into the individual fields of the storage areas (63, 64), that following the loading of the storage areas (63, 64) with print data for a recording pass for each print position, the print data for the left-hand and right-hand print element column can be called up from the storage area fields corresponding to a print position, and that this processing for the respective subsequent p scan dots of the screen lines can be repeated until all screen scan dots have been printed.
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公开(公告)号：DE2945697A1
公开(公告)日：1980-05-29
申请号：DE2945697
申请日：1979-11-13
Applicant: IBM
Inventor： ARNOLD ROBERT WALKER , GALETTO LOUIS VALENTINE
Abstract: 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 of or pulse width modulating a DC voltage applied to the motor drive circuits of a DC motor.
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