公开(公告)号：FR2370521A1

公开(公告)日：1978-06-09

申请号：FR7729868

申请日：1977-09-28

Applicant: IBM

Inventor： JANSEN DONALD F ,  TAMULIS JOHN C ,  TOMASKY THOMAS ,  ZABLE JACK L

IPC: B41J2/175 ,  B41J2/12 ,  B41J2/125 ,  B05B12/08 ,  B41J3/04 ,  B41J27/18 ,  B41J29/38

公开(公告)号：DE2750303A1

公开(公告)日：1978-05-18

申请号：DE2750303

申请日：1977-11-10

Applicant: IBM

Inventor： ARNOLD ROBERT WALKER ,  TOMASKY THOMAS

IPC: B41J2/125 ,  B41J3/04

Abstract: Ink jet printer has a control for regulating the speed of the ink jet within a predetermined speed range. Two ink droplet detectors (24, 25) are positioned at a predetermined distance from one another and the droplet selection unit (17) and are connected to a servo-control (23) to which an impulse generator (16, 16a) is also coupled. This generator is connected to an oscillator (15). In the direction of flight the distance of the first detector (24) from the droplet formation point and the distance of the second detector (25) from the selection unit (17) amount in each case to a certain number of droplet wave lengths. When the droplets are travelling at the desired speed, the spacing between the two detectors amounts to.

公开(公告)号：DE2744701A1

公开(公告)日：1978-05-18

申请号：DE2744701

申请日：1977-10-05

Applicant: IBM

Inventor： JENSEN DONALD FREDERICK ,  TAMULIS JOHN CARL ,  TOMASKY THOMAS ,  ZABLE JACK LOUIS

IPC: B41J2/175 ,  B41J2/12 ,  B41J2/125 ,  B41J3/04

公开(公告)号：CA1098160A

公开(公告)日：1981-03-24

申请号：CA287943

申请日：1977-10-03

Applicant: IBM

Inventor： JENSEN DONALD F ,  TAMULIS JOHN C ,  TOMASKY THOMAS ,  ZABLE JACK L

IPC: B41J2/175 ,  B41J2/12 ,  B41J2/125 ,  G01D15/16 ,  G01D18/00

Abstract: METHOD AND APPARATUS FOR CONTROLLING THE VELOCITY OF INK DROPS IN AN INK JET PRINTER In an ink jet printer, drops are generated at a test frequency which is a harmonic of the drop generation rate for printing. If an error in velocity is detected at the test frequency, a coarse correction velocity is made to bring the correct number of drops within the range of onehalf the wavelength at the nth drop location relative to a drop detector. Drops are then generated at the printing frequency and a fine correction in the velocity is made if a velocity error is detected.

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

IPC: B41J2/175 ,  B41J2/12 ,  B41J2/125 ,  G01D15/18 ,  B41J3/04 ,  G01D15/16

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.

公开(公告)号：FR2370522A1

公开(公告)日：1978-06-09

申请号：FR7729895

申请日：1977-09-29

Applicant: IBM

Inventor： ARNOLD ROBERT W ,  TOMASKY THOMAS

IPC: B41J2/175 ,  B41J2/12 ,  B41J2/125 ,  G01D15/18 ,  B05B12/08 ,  B41J3/04 ,  B41J27/18 ,  B41J29/38