Method and apparatus for duplex printing
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United States of America Patent
Stats
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Jun 19, 1990
Grant Date -
N/A
app pub date -
Jun 28, 1989
filing date -
Jun 28, 1989
priority date (Note) -
Expired
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Abstract
A duplex printing apparatus has a printing unit for consectively printing images on the first sides of paper sheets and on the second sides of paper sheets. A reversing unit is mounted adjacent to the printing unit for receiving the paper sheets discharged from the printing unit and for consecutively reversing the paper sheets. A duplexing unit is mounted adjacent to the reversing unit and the printing unit, for receiving the reversed paper sheets from the reversing unit and for feeding the reversed sheets back into the printing unit for printing on the second sides of the sheets. A control unit is coupled to the printing unit, the reversing unit, and the duplexing unit. The control unit determines an interleave number that equals the maximum number of sheets with images printed on their first sides that can fit within a duplex feed path, so that each consecutive sheet is spaced a sufficient distance apart to interleave a new sheet therebetween. The control unit is operable so that after the number of sheets equal to the interleave number have the images printed on their first sides, the new sheets are consecutively interleaved therebetween. The new sheets are the printed on their first sides alternately with the reversed sheets that are duplex printed on their second sides.
First Claim
Family
- 15 United States
- 10 France
- 8 Japan
- 7 China
- 5 Korea
- 2 Other
Patent Owner(s)
- HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.
International Classification(s)
Inventor(s)
Inventor Name | Address | # of filed Patents | Total Citations |
---|---|---|---|
Veeder, Nicholas P | Weston, MA | 1 | 44 |
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Maintenance Fees
Fee | Large entity fee | small entity fee | micro entity fee | due date |
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Fee | Large entity fee | small entity fee | micro entity fee |
---|---|---|---|
Surcharge after expiration - Late payment is unavoidable | $700.00 | $350.00 | $175.00 |
Surcharge after expiration - Late payment is unintentional | $1,640.00 | $820.00 | $410.00 |
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