US3752288A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrographic printer with plural oscillating print head
Assignee: Olivetti SpA
•
Filing: 1971-02-18
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Granted: 1973-08-14
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Expires: 1991-02-18
Abstract
Abstract A high speed, electrographic, non-impact printer for printing matrix-type characters on the dielectric coated face of a paper web. A print head having a plurality of linearly arranged styli therein is transported in an oscillatory fashion across the dielectric coated face of the web with the styli in virtual contact therewith. Means are provided for selectively energizing the styli for depositing dots of electric charge in image configuration on the dielectric as the print head traverses the web in both directions. The position of the print head as it traverses the web in both directions is sensed for controlling the selective energizing means for depositing dots of electric charge on the dielectric only when the print head is in predetermined positions in its path across the web. The dots of electrical charge are developed by means of a toner system.
Inventors
- 👤 R Detig
- 👤 B Boyson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:33
CPC Classifications
B; B41; B41J; B41J2/00; B41J2/385; B41J2/39; Y; Y10; Y10S; Y10S101/00; Y10S101/37
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
284 words
An electrographic printer for printing dot matrix-type characters on a web of dielectric coated paper comprising: means for moving said web along a path; a printing assembly including a slidable member and a plurality of print heads mounted in said slidable member, the spaces between adjacent print heads being equal, each of said print heads having a plurality of styli, said slidable member being mounted for movement transverse to the path of the said web with said styli in contact with the dielectric cOated face thereof; means for transporting said slidable member in an oscillatory fashion across said web; the amplitude of the oscillations being at least equal to the distance between adjacent print heads; means for selectively energizing said styli for depositing dots of electric charge in image configuration on said dielectric coated face of said web as said slidable member traverses said web in either direction, each of said print heads being operational to print a portion of a line simultaneously with the printing of other portions of the line by the other print heads of said plurality of print heads; means coupled to said slidable member for sensing the position of said slidable member as it traverses said web in either direction and for enabling said selective energizing means for depositing dots of electrical charge on said dielectric coated face of said web only when said slidable member is in predetermined positions in its path across said web, said means for moving said web operating to advance said web by a predetermined amount after each traverse of said slidable member across said web; and processor means for developing said dots of electrical charge deposited by said styli of said print heads.
Claim 2
Dependent Claim
284 words
An electrographic printer for printing dot matrix-type characters on a web of dielectric coated paper comprising: means for moving said web along a path; a printing assembly including a slidable member and a plurality of print heads mounted in said slidable member, the spaces between adjacent print heads being equal, each of said print heads having a plurality of styli, said slidable member being mounted for movement transverse to the path of the said web with said styli in contact with the dielectric cOated face thereof; means for transporting said slidable member in an oscillatory fashion across said web; the amplitude of the oscillations being at least equal to the distance between adjacent print heads; means for selectively energizing said styli for depositing dots of electric charge in image configuration on said dielectric coated face of said web as said slidable member traverses said web in either direction, each of said print heads being operational to print a portion of a line simultaneously with the printing of other portions of the line by the other print heads of said plurality of print heads; means coupled to said slidable member for sensing the position of said slidable member as it traverses said web in either direction and for enabling said selective energizing means for depositing dots of electrical charge on said dielectric coated face of said web only when said slidable member is in predetermined positions in its path across said web, said means for moving said web operating to advance said web by a predetermined amount after each traverse of said slidable member across said web; and processor means for developing said dots of electrical charge deposited by said styli of said print heads.
Claim 3
Dependent Claim
141 words
The printer of claim 1 wherein said position sensing means includes: a light transmitting mask mounted for movement with said slidable member; a plurality of parallel opaque lines on said mask, said lines being spaced by the intercolumn distance between the columns of dots of said matrix-type characters being printed and being oriented orthogonally with respect to the path of movement of said slidable member; means fixedly mounted for projecting light through said mask at a point in its path from one side thereof; means fixedly mounted opposite said light projecting means on the other side of said mask for sensing the amount of light transmitted through said mask at a point in its path; and means responsive to the sensing of the passage of said opaque lines by said sensing means for controlling the actuation of said selective energizing means.
Claim 4
Dependent Claim
43 words
The printer of claim 2 wherein said light projecting means include a lamp and a fiber optic bundle for transmitting light from said lamp to a line portion of said path, said line portion being parallel to said opaque lines on said mask.
Claim 5
Dependent Claim
30 words
The printer of claim 3 wherein the width of said line portion in the path of said mask is less than the width of said opaque lines on said mask.
Claim 6
Dependent Claim
125 words
The printer of claim 3 wherein said transmitted light sensing means includes a photosensitive device and a fiber optic bundle for delivering light from a line portion of the path of said mask directly opposite the line portion illuminated by the fiber optic bundle of said light projecting means to said photo-sensitive device. 6. The printer of claim 1 wherein said means for transporting said slidable member includes: a motor; a disc rotated at a constant angular velocity by said motor; cable means connecting a point proximate the periphery of said disc to both ends of said slidable member; and resilient means connected in series with said cable means for compensating for changes in length of said cable means during the rotation of said disc.
Claim 7
Dependent Claim
79 words
The printer of claim 1 wherein said slidable member transporting means include a motor, and a clutch brake mechanism between said motor and said slidable member for selectively stopping said slidable member at either end of its traverse of said web and wherein said printer further includes means for causing said web moving means to advance said web by a selected amount while said slidable member is held at an extreme of its path by said clutch brake mechanism.
Claim 8
Dependent Claim
72 words
The printer of claim 1 wherein said styli on said print heads are oriented in a line perpendicular to the direction of motion of said print heads and are spaced from one another by the row distance of the dots of the matrix-type characters to be printed, and further including an underlining stylus spaced from said plurality of styli and selectively energizable for underlining information printed by said plurality of writing styli.
Claim 9
Dependent Claim
31 words
The printer of claim 1 further including a grounding plate directly opposite said print heads on the opposite side of said web, said grounding plate being urged toward said print heads.
Claim 10
Dependent Claim
38 words
The printer of claim 9 wherein said print heads are slidably mounted in said slidable member for movement perpendicular to said web and said printing assembly further includes: means for resiliently biasing said print heads against said web.
Claim 11
Dependent Claim
77 words
The apparatus of claim 1 wherein said styli of said print heads are arranged in a spaced linear relationship and wherein said print heads further include: insulating layers on either side of said line of spaced styli; and bearing members having a substantially higher resistance to wear than said insulating layers attached to either side of said insulating layers, said bearing members, insulating layers and styli being arranged with a smooth flush face oriented towards said web.
Claim 12
Dependent Claim
197 words
An electrographic printer for printing characters on the web of dielectric coated paper comprising: means for moving said web along a path; a printing assembly including a slider having a printing face and a plurality of groups of linearly arranged spaced styli therein, the ends of said styli being substantially flush with said printing face, said slider being mounted for oscillatory movement transverse to the path of said web with said printing face in contact with the dielectric coated face thereof; means for transporting said slider in an oscillatory fashion across said web; means for selectively energizing said styli for depositing dots of an electric charge in image configuration on the said dielectric coated face of said web as said slider traverses said web in both directions, said groups of said styli being arranged in equal spaced relationship with one another for depositing charge on equal adjacent segments of said web, each of said groups of styli being operational to print a portion of a line simultaneously with the printing of the other portions of the line by the other groups of styli; and processor means for developing said dots of electric charge deposited by said styli.
Claim 13
Dependent Claim
197 words
An electrographic printer for printing characters on the web of dielectric coated paper comprising: means for moving said web along a path; a printing assembly including a slider having a printing face and a plurality of groups of linearly arranged spaced styli therein, the ends of said styli being substantially flush with said printing face, said slider being mounted for oscillatory movement transverse to the path of said web with said printing face in contact with the dielectric coated face thereof; means for transporting said slider in an oscillatory fashion across said web; means for selectively energizing said styli for depositing dots of an electric charge in image configuration on the said dielectric coated face of said web as said slider traverses said web in both directions, said groups of said styli being arranged in equal spaced relationship with one another for depositing charge on equal adjacent segments of said web, each of said groups of styli being operational to print a portion of a line simultaneously with the printing of the other portions of the line by the other groups of styli; and processor means for developing said dots of electric charge deposited by said styli.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-13 | 1977-02-12 | 1977-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-13 | 1981-02-12 | 1981-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-13 | 1985-02-12 | 1985-08-14 | $7700.00 | Window Closed / Lapsed |