Patent US3624731A successfully refreshed from Google Patents.
US3624731A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Printing apparatus and process for controlling ink fog
Assignee: Denver Post Inc
•
Filing: 1969-07-16
•
Granted: 1971-11-30
•
Expires: 1989-07-16
Abstract
Abstract Ink fog is controlled or reduced by mixing with the ink finely divided particles of a magnetic material, such as iron oxide, and feeding the ink from the ink fountain to the impression cylinder by a series of rollers, at least some of which are magnetized, so as to attract ink-fog-containing magnetic particles. The magnetized rollers preferably include alternating north and south poles on the outside, as through the use of a series of magnetic rings having alternating poles on the outside, interspaced between unmagnetized discs, by electromagnetic coils wound to produce the alternating poles on spools formed of a core material, or by induced magnetism. In the latter instance, the outer layer of the roller may be formed of a magnetizable metal, or of rubber in which is embedded finely divided magnetic particles. The spacing of the permanent magnet discs may also be adjusted by sponge rubber discs interspaced therebetween.
Inventors
- 👤 Eugene T Lindberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:35
CPC Classifications
B; B41; B41F; B41F31/00; B41F31/001
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
130 words
A method of controlling ink fog in a printing press which is generated when the ink moves from one rapidly revolving roller to a second rapidly revolving roller contacting the first, and including the steps of: a. providing a group of not less than three rollers arranged in sequence with one roller at one end of the sequence adapted to receive ink from a fountain roller and the roller at the other end of the sequence adapted to apply ink to a plate cylinder; b. rendering the ink responsive to magnetic stimulus; and c. magnetizing at least one of every pair of contacting rollers whereby the ink which is normally ejected from the contacting region of the said rollers as fog particles will be attracted to the said magnetized roller.
Claim 2
Independent Claim
130 words
A method of controlling ink fog in a printing press which is generated when the ink moves from one rapidly revolving roller to a second rapidly revolving roller contacting the first, and including the steps of: a. providing a group of not less than three rollers arranged in sequence with one roller at one end of the sequence adapted to receive ink from a fountain roller and the roller at the other end of the sequence adapted to apply ink to a plate cylinder; b. rendering the ink responsive to magnetic stimulus; and c. magnetizing at least one of every pair of contacting rollers whereby the ink which is normally ejected from the contacting region of the said rollers as fog particles will be attracted to the said magnetized roller.
Claim 3
Dependent Claim
27 words
In the method defined in claim 1, wherein the ink is rendered magnetic by the addition of comminuted iron oxide as a pigment to the ink vehicle.
Claim 4
Dependent Claim
33 words
A method as defined in claim 1, wherein said magnetized rollers have a rubber-type outer layer, which includes: embedding a plurality of magnetizable particles in said outer layer prior to inducing magnetism therein.
Claim 5
Dependent Claim
21 words
A method as defined in claim 1, including: producing said magnetized rollers to provide alternating magnetic poles longitudinally of said rollers.
Claim 6
Dependent Claim
107 words
In a printing press combination; a group of not less than three rollers arranged in sequence with one roller at one end of the sequence adapted to receive ink from a fountain roller and a roller at the other end of the sequence adapted to apply ink to a plate cylinder; means for supplying magnetic ink to said rollers; means for rotating said rollers thereby producing ink fog particles at the contacting nips thereof; at least one of each contacting pair of rollers in the said sequence being magnetized, whereby to eliminate ink fog in a printing operation when said magnetic ink is used in the operation.
Claim 7
Dependent Claim
107 words
In a printing press combination; a group of not less than three rollers arranged in sequence with one roller at one end of the sequence adapted to receive ink from a fountain roller and a roller at the other end of the sequence adapted to apply ink to a plate cylinder; means for supplying magnetic ink to said rollers; means for rotating said rollers thereby producing ink fog particles at the contacting nips thereof; at least one of each contacting pair of rollers in the said sequence being magnetized, whereby to eliminate ink fog in a printing operation when said magnetic ink is used in the operation.
Claim 8
Dependent Claim
25 words
In printing apparatus as defined in claim 5, wherein: at least one of said magnetized rollers is magnetized to provide alternating magnetic poles longitudinally thereof.
Claim 9
Dependent Claim
42 words
In printing apparatus, as defined in claim 5, wherein: some of said magnetized rollers have a metallic outer surface and other rollers have an outer, rubber-type layer; and at least one of said outer, rubber-type layers is provided with embedded, magnetized particles.
Claim 10
Dependent Claim
38 words
In printing apparatus as defined in claim 5, wherein: at least one of said magnetized rollers has a metallic outer surface and includes a series of circumferentially magnetized, metallic discs having alternating magnetic poles longitudinally of said roller.
Claim 11
Dependent Claim
30 words
In printing apparatus as defined in claim 7, wherein: each said disc is hollow and has a magnetic pole on the inside opposite to the magnetic pole on the outside.
Claim 12
Dependent Claim
22 words
In printing apparatus, as defined in claim 7, wherein: said magnetized roller is provided with unmagnetized discs alternating with said magnetized discs.
Claim 13
Dependent Claim
39 words
In printing apparatus as defined in claim 5, wherein: at least one said magnetized roller has an exterior metal surface formed by a relatively thin tube of nonmagnetic metAl; and a series of electromagnets disposed longitudinally within said tube.
Claim 14
Dependent Claim
46 words
In printing apparatus as defined in claim 11, wherein: said electromagnets comprise wire coils wound within spools formed of electromagnetic materials, said coils being wound so as to produce alternating magnetic poles longitudinally of said roller; and means for supplying a direct current to said coils.
Claim 15
Dependent Claim
40 words
In printing apparatus as defined in claim 5, wherein: at least one said magnetized roller has an exterior metal surface formed by a relatively thin tube of nonmagnetic material; and a series of permanent magnets disposed longitudinally within said tube.
Claim 16
Dependent Claim
116 words
In printing apparatus as defined in claim 13, wherein: said permanent magnets comprise a spaced series of hollow discs having a different magnetic pole at the inside than at the outside, said discs being disposed to provide alternating magnetic poles longitudinally of said roller; a series of hollow rings of compressible, nonmagnetic material interspaced with said magnetized discs; a central shaft for supporting said roller for rotation; a series of hollow cylinders formed of magnetic material and surrounding said shaft for supporting said compressible rings, said support cylinders having a lesser width than the uncompressed width of said rings; and means exerting force longitudinally of said roller for holding said magnetized discs against said compressible rings.
References Cited (Backward Citations)
US1531492A
Cited
US2224391A
Cited
FR1142671A
Cited
US3067718A
Cited
US3011435A
Cited
US3082171A
Cited
US3121131A
Cited
US3097598A
Cited
US3329088A
Cited
US3278441A
Cited
US3370546A
Cited
US3438324A
Cited
US3509819A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-29 | 1975-05-31 | 1975-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-29 | 1979-05-31 | 1979-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-29 | 1983-05-31 | 1983-11-30 | $7700.00 | Window Closed / Lapsed |