US3672298A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ink mist suppression for a rotary printing press
Assignee: Boeing North American Inc
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Filing: 1970-01-29
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Granted: 1972-06-27
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Expires: 1990-01-29
Abstract
Abstract An ink mist suppressing arrangement for a printing press having a resiliently covered roller and cooperating cylinder carrying a film of ink and rotated at high speed in which the roller is insulated from the cylinder and charged with high voltage for the setting up of an electric field between the roller and cylinder for acting upon and returning ink mist particles to the film. The resilient surface layer on the roller may be formed of conventional material, for example synthetic rubber and in conventional thickness. No auxiliary wire or similar electrode, such as commonly used for establishing a corona discharge, need be employed.
Inventors
- 👤 Robert B Reif
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 00:57
CPC Classifications
B; B41; B41F; B41F31/00; B41F31/001
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
307 words
In combination with a printing press having a press frame, a printing cylinder and an impression cylinder mounted on the press frame for printing on a cooperating moving web, and an ink fountain supplying ink for the printing cylinder, ink train apparatus for transferring ink from the ink fountain to the printing cylinder comprising: a fountain roll having a rotational axis with a fixed location relative to said press frame during printing and receiving ink at its cylindrical surface from said ink fountain, a high voltage electrical energy supply having terminals of substantially different electrical potential, a plurality of intermeDiate transfer rolls in serial rolling contact comprised of first rolls having metallic surfaces joined to respective electrically conducting first roll cores and of second rolls alternated with said first rolls and having resilient, dielectric-coated surfaces joined to respective electrically conducting second roll cores, means rotatably mounting said transfer rolls on said press frame including means for electrically insulating said first roll cores from said second roll cores so as to prevent a short circuit relationship between said first roll cores and said second roll cores through said press frame, first means electrically connecting each of said first roll cores directly without an air gap to one of said electrical energy supply terminals, and second means electrically connecting each of said second roll cores directly without an air gap to another of said electrical energy supply terminals of substantially different electrical potential, the first one of said intermediate transfer rolls in serial rolling contact additionally contacting said fountain roll in rolling relation and the last one of said intermediate transfer rolls in serial rolling contact additionally contacting said printing cylinder in rolling relation when ink supplied by said ink fountain is sequentially transferred from said fountain roll, serially through said intermediate transfer rolls, and to said printing cylinder.
Claim 2
Dependent Claim
307 words
In combination with a printing press having a press frame, a printing cylinder and an impression cylinder mounted on the press frame for printing on a cooperating moving web, and an ink fountain supplying ink for the printing cylinder, ink train apparatus for transferring ink from the ink fountain to the printing cylinder comprising: a fountain roll having a rotational axis with a fixed location relative to said press frame during printing and receiving ink at its cylindrical surface from said ink fountain, a high voltage electrical energy supply having terminals of substantially different electrical potential, a plurality of intermeDiate transfer rolls in serial rolling contact comprised of first rolls having metallic surfaces joined to respective electrically conducting first roll cores and of second rolls alternated with said first rolls and having resilient, dielectric-coated surfaces joined to respective electrically conducting second roll cores, means rotatably mounting said transfer rolls on said press frame including means for electrically insulating said first roll cores from said second roll cores so as to prevent a short circuit relationship between said first roll cores and said second roll cores through said press frame, first means electrically connecting each of said first roll cores directly without an air gap to one of said electrical energy supply terminals, and second means electrically connecting each of said second roll cores directly without an air gap to another of said electrical energy supply terminals of substantially different electrical potential, the first one of said intermediate transfer rolls in serial rolling contact additionally contacting said fountain roll in rolling relation and the last one of said intermediate transfer rolls in serial rolling contact additionally contacting said printing cylinder in rolling relation when ink supplied by said ink fountain is sequentially transferred from said fountain roll, serially through said intermediate transfer rolls, and to said printing cylinder.
Claim 3
Dependent Claim
91 words
The invention defined by claim 1 wherein said electrical energy supply terminals have an electrical potential difference in the approximate range of 10 to 15 kilovolts, said intermediate transfer rolls having an electrical current path between each combination of a first roll core and a serially adjacent second roll core which extends through a second roll resilient, dielectric-coated surface and an ink film contacting said surface and which develops an electrical current in the approximate range of 1 to 5 milliamperes in said path by reason of said electrical potential difference.
References Cited (Backward Citations)
US2151390A
Cited
US2558900A
Cited
US2558901A
Cited
US3011435A
Cited
US3316879A
Cited
GB1159923A
Cited
US3477369A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-27 | 1975-12-27 | 1976-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-27 | 1979-12-27 | 1980-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-27 | 1983-12-27 | 1984-06-27 | $7700.00 | Window Closed / Lapsed |