公开(公告)号：DE3169337D1

公开(公告)日：1985-04-25

申请号：DE3169337

申请日：1981-04-28

Applicant: IBM

Inventor： HEIBEIN HARRY PARMER ,  TSAO CHEIN-HWA SCHULER

IPC: B41J2/08 ,  B41J2/12 ,  B41J3/04

公开(公告)号：DE3269555D1

公开(公告)日：1986-04-10

申请号：DE3269555

申请日：1982-04-07

Applicant: IBM

Inventor： BILDSTEIN CARL ROBERT ,  HEIBEIN HARRY PARMER ,  MATHEWS HARLAN PAUL

IPC: B41J2/175 ,  B41J23/32 ,  H01F7/18 ,  B41J3/04

Abstract: An ink jet pump is switched from a mechanically off or idle state to a mechanically on or active state with no drift in pressure output by maintaining the pump at the same point in its force-temperature characteristic when it is on and off. This is accomplished by driving the pump in both the active and idle states with signals that dissipate the same amount of power in the pump. The frequency of the idle state signals is high enough that the pump can not mechanically respond. The power dissipations in the active and idle states are matched by adjusting the current build-up and current decay through the coil of the pump during the idle state. When the RMS current through the coil in the active state equals the RMS current in the idle state, the power dissipations are matched.As shown voltage regulator circuit (20) provides potential (V2) and current is drawn through the pump solenoid (12) via transistor (14) or (16). When the pump is active a 60 Hz signal is applied to transistor (14) and when the pump is idle a 26 KHz signal is applied to transistor (16). The 60 Hz signal switches transistor (14) on and off, alternately reverse and forwardly biasing diode (30) and causes the current I to build-up and decay. This occurs at a frequency the pump diaphragm can follow. Operation is similar at 26 KHz but the pump stops because it cannot operate at the high frequency. The idle current level is set by adjusting resistor (R3).

公开(公告)号：DE3066869D1

公开(公告)日：1984-04-12

申请号：DE3066869

申请日：1980-11-20

Applicant: IBM

Inventor： HEIBEIN HARRY PARMER ,  MILLINGTON RICHARD GEORGE ,  SALVADORE JOHN MICHAEL ,  SCOTT DEAN JEROME ,  SENDELWECK MICHAEL LYNN

IPC: B41J2/01 ,  B41J2/135 ,  B41J3/04

Abstract: The ink jet head assembly disclosed herein has modular subassemblies with predetermined relationships between the subassemblies to minimize realignment of the ink stream when a subassembly is replaced in the field. The head assembly is modularized into nozzle, charge electrode, deflection electrode and gutter subassemblies. The charge electrode module is mounted on the nozzle module in a manner such that no field adjustment is necessary to center the charge electrode horizontally to the ink stream. The deflection electrode module is mounted on the gutter module in a manner such that no field adjustment is necessary to center the deflection electrode horizontally to the ink stream. The nozzle and charge electrode subassembly have a preset adjustment, and the gutter and deflection electrode assembly have a preset adjustment such that no field adjustment between these two subassemblies is necessary to maintain a constant flight distance for the ink drops. Finally, the nozzle module is adjustable to reposition the ink stream about the pitch axis (vertical adjustment) and the yaw axis (horizontal adjustment). The yaw axis adjustment may be preset. The pitch axis adjustment is the only mechanical adjustment necessary in the field when replacing the nozzle module.