Patent US3812495A successfully refreshed from Google Patents.
US3812495A
Expired / Lapsed
US
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Mosaic printer
Assignee: Bull SAS
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Filing: 1972-10-04
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Granted: 1974-05-21
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Expires: 1992-10-04
Abstract
Abstract A mosaic printer is provided with a cylindrical rotating drum on the outer surface of which is a raised spiral threading, and a plurality of print hammers in the form of elongated plates is located along the lengthwise edge of said drum, the print medium moved between the drum and the hammers at a fixed speed during printing. Each of the elongated plates is sloped in relation to the axis of the drum, the lower end of the plates, in relation to the movement of the print medium, being directed towards the upstream side of the corresponding movement of the spiral threading, as compared with these plates.
Inventors
- 👤 H Venker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:53
CPC Classifications
B; B41; B41J; B41J2/00; B41J2/485; B41J2/495
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
131 words
A mosaic printer, comprising a cylindrical rotating drum, the outer surface of said drum having a raised Spiral threading, a number of print hammers in the form of elongated plates located along said drum, a print medium, means to move said print medium between said drum and said hammers at a fixed speed during printing, each of said plates being inclined relative to the axis of said drum in order to compensate for the continuous displacement of said print medium, the length of each of said plates being slightly greater than the pitch of said spiral with the adjoining ends of adjacent plates overlapping longitudinally, said threading having a plurality of identical notches arranged in a row parallel to said drum axis, said notches dividing the threading into consecutive separate turns.
Claim 2
Dependent Claim
131 words
A mosaic printer, comprising a cylindrical rotating drum, the outer surface of said drum having a raised Spiral threading, a number of print hammers in the form of elongated plates located along said drum, a print medium, means to move said print medium between said drum and said hammers at a fixed speed during printing, each of said plates being inclined relative to the axis of said drum in order to compensate for the continuous displacement of said print medium, the length of each of said plates being slightly greater than the pitch of said spiral with the adjoining ends of adjacent plates overlapping longitudinally, said threading having a plurality of identical notches arranged in a row parallel to said drum axis, said notches dividing the threading into consecutive separate turns.
Claim 3
Dependent Claim
45 words
A machine according to claim 1, characterized in that the length of the notches is such that when one of the plate ends is positioned directly above a turn the other end of said plate is located opposite the notch of the corresponding adjoining turn.
Claim 4
Dependent Claim
51 words
A machine according to claim 1, characterized in that the spiral thread consists of a series of identical spiral half-turns which are turned alternatingly 180* in relation to the preceding one around the drum axis, the ends opposite the two adjoining half-turns being separated from each other by a constant span.
Claim 5
Dependent Claim
30 words
A machine according to claim 3, characterized by each half-turn being associated with the printing of a character, while the interval between said half-turns corresponds with the span between characters.
Claim 6
Dependent Claim
72 words
A machine according to claim 3, characterized in that each plate has two parallel rectangular sections extending in opposite directions from a connecting section joining adjacent ends of said rectangular section, the rectangular section positioned on the upstream side of the connecting section relative to movement of the spiral threading having its end joined to the downstream end of said connecting section relative to the direction of movement of said print medium.
Claim 7
Dependent Claim
26 words
A machine according to claim 5, characterized in that the length of said connecting section is roughly equal to half the height of a print dot.
Claim 8
Dependent Claim
26 words
A machine according to claim 5, characterized in that each rectangular section of the plate is associated with one of two consecutive half-turns rotated by 180*.
Claim 9
Dependent Claim
71 words
A machine according to claim 7, in which each half-turn and plate section are adapted for printing x dots and in which the span between two sequential turns corresponds with the width of y dots, characterized in that the length of a plate corresponds at least with 2 x + y dots, while the span between two consecutive plates is at the most equal to a distance corresponding with y dots.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-05-20 | 1977-11-19 | 1978-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-20 | 1981-11-19 | 1982-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-20 | 1985-11-19 | 1986-05-21 | $7700.00 | Window Closed / Lapsed |