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 Title: |
US4864323:
Continuous ink jet printing
[ Derwent Title ]
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| Country: |
US United States of America
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| Inventor: |
Lecheheb, Ammar; Newmarket, United Kingdom
Doyle, James J.; Histon, United Kingdom
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| Assignee: |
Domino Printing Sciences PLC, Cambridge, United Kingdom
other patents from DOMINO PRINTING SCIENCES PLC (151595) (approx. 40)
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| Published / Filed: |
1989-09-05
/ 1988-04-12
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| Application Number: |
US1988000180460
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| IPC Code: |
Advanced:
B41J 2/02;
B41J 2/115;
B41J 2/12;
H04N 1/40;
Core:
B41J 2/015;
B41J 2/07;
more...
IPC-7:
G01D 18/00;
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| U.S. Class: |
Current:
347/078;
347/006;
347/089;
Original:
346/001.1;
346/075;
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| Field of Search: |
346/1.1,75
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| Priority Number: |
| 1987-04-14 |
GB1987000008885 |
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| Abstract: |
A method of operating a continuous ink jet printing system which includes a nozzle arranged to be vibrated by a piezoelectric oscillator. The nozzle, in use, passes a stream of ink past a charging electrode. The continuity of charge detection is sensed by a charge detector disposed immediately downstream of the charging electrode. The amplitude of the stimulation voltage applied to the piezoelectric oscillator is set sufficiently low such that the level of charge detected by the charge detector is below a threshold value. The amplitude of the stimulation voltage is then increased in discrete steps until the charge detector detects intermittent and proper droplet charging. The amplitude of the stimulation voltage is then further increased from its level at the end of the second step by a predetermined amount.
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| Attorney, Agent or Firm: |
Robbins & Laramie ;
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| Primary / Asst. Examiners: |
Shaw, Clifford C.; Preston, Gerald E.
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| Maintenance Status: |
E3 Expired Check current status
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| INPADOC Legal Status: |
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| Designated Country: |
DE FR GB
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| Family: |
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First Claim:
Show all 4 claims |
We claim:
1. A method of operating a continuous ink jet printing system which includes a nozzle; a piezoelectric oscillator arranged to vibrate the nozzle and driven by a stimulation voltage; a charging electrode, said nozzle, in use, passing a stream of ink under pressure past said charging electrode; and a charge detector disposed immediately downstream of said charging electrode, said method comprising :
- sensing the continuity of charge detection by means of said charge detector; and the steps of:
- (a) firstly, setting the amplitude of said stimulation voltage applied to the piezoelectric oscillator sufficiently low that the level of charge detected by said charge detector is below a predetermined threshold value;
- (b) secondly, increasing the amplitude of said stimulation voltage in discrete steps until said charge detector detects intermittent and proper droplet charging; and,
- (c) thereafter increasing the amplitude of said stimulation voltage from its level at the end of the step (b) by a predetermined amount.
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| Background / Summary: |
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| Drawing Descriptions: |
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| Description: |
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| Forward References: |
Show 5 U.S. patent(s) that reference this one
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