Back to results
US 2012/0256993 A1Published application
Print process for duplex printing with alternate imaging order
AssigneeXerox Corporation
InventorsDaniel Clark Park, Brent E. Fleming, Michael E. Jones, Zhikui Ren
Life of this patent
Estimating the term…
Abstract
A method for performing duplex printing with improved throughput has been developed. The method includes forming an image of a back side of a first duplex page and an image of a front side of a second duplex page on an image receiving member. Two recording media sheets are serially passed through a nip to transfer the image of the first duplex page back side to a bare side of a recording media sheet that also bears the image of the front side of the first duplex page on an obverse side and to transfer the image of the second duplex page to a bare side of a recording media sheet that has not been previously printed.
Claims25
A method of operating a printer comprising:
- forming a first ink image that is a second side image of a duplex page on an image receiving member and forming a second ink image that is a first side image of another duplex page on the image receiving member, the first ink image and the second ink image being separated by a first inter-document zone and a second inter-document zone;
- moving a transfix roller into engagement with the image receiving member to form a nip as the first ink image on the image receiving member approaches the nip;
- and
- continually rotating the image receiving member as the first ink image is transferred to a second side of a first sheet of recording media bearing an ink image on a first side of the first sheet as one of the inter-document zones on the image receiving member moves through the nip, and as the second ink image is transferred to a first side of a second sheet of recording media on which no other ink image has been previously transferred.
1 more element
A duplex printing system comprising:
- an image receiving member;
- an actuator operatively connected to the image receiving member to rotate the image receiving member;
- a transfix roller operatively connected to a transfix roller actuator to move the transfix roller into and out of engagement with the image receiving member;
- a marking unit including at least one printhead, the marking unit being configured to eject ink drops onto the image receiving member;
- and
- a controller operatively connected to the marking unit, actuator, and transfix roller actuator, the controller being configured to:
- operate the marking unit to form a first ink image that is a second side image of a duplex page on the image receiving member and form a second ink image that is a first side image of another duplex page on the image receiving member, the first ink image and the second ink image being separated by a first inter-document zone and a second inter-document zone
- operate the transfix roller actuator to move the transfix roller into engagement with the image receiving member to form a nip as the first ink image on the image receiving member approaches the nip;
- and
- operate the actuator to rotate the image receiving member continually as the first ink image is transferred to a second side of a first sheet of recording media bearing an ink image on a first side of the first sheet as one of the inter-document zones on the image receiving member moves through the nip, and as the second ink image is transferred to a first side of a second sheet of recording media on which no other ink image has been previously transferred.
7 more elements
A method of operating a printer comprising:
- forming a plurality of ink images in on an image receiving member that are separated by a plurality of inter-document zones, each ink image in the plurality of ink images being separated from at least one of the other ink images by one of the plurality of inter-document zones;
- moving a transfix roller into engagement with the image receiving member in one of inter-document zones to form a nip as one ink image in the plurality of ink images on the image receiving member approaches the nip;
- continually rotating the image receiving member as a plurality of sheets of recording media pass through the nip, each ink image in the plurality of ink images being transferred to a side of one sheet in the plurality of sheets on which no other ink image has been previously transferred;
- and
- contacting only a portion of a surface of the transfix roller that contacts the one of the inter-document zones with each of the other inter-document zones as the plurality of sheets pass through the nip.
2 more elements
A method of operating a printer comprising:
- forming an ink image on a second side of a first media sheet, a first side of the first media sheet having an ink image that is fixed to the first media sheet;
- forming another ink image on a second media sheet;
- applying release agent to a first pressure roller;
- engaging the first pressure roller with a second pressure roller to form a nip as the first media sheet approaches the nip;
- rotating the first pressure roller and the second pressure roller as the first media sheet moves through the nip to enable the ink image on the second side of the first media sheet to be fixed to the first media sheet by the first pressure roller and to transfer a release agent from the second pressure roller to the first side of the first media sheet;
- continuing to rotate the first pressure roller and the second pressure roller for a predetermined time after the first media sheet exits the nip and prior to the second media sheet entering the nip, a portion of the release agent on the first pressure roller transferring to the second pressure roller;
- and
- rotating the first pressure roller and the second pressure roller as the second media sheet moves through the nip to enable the ink image on the second media sheet to be fixed to the second media sheet by the first pressure roller without transferring the portion of the release agent transferred to the second pressure roller to a surface of the second media sheet engaging the second pressure roller, the second pressure roller having a circumference that is equivalent to a sum of a length of the first media sheet and a product of a linear velocity of the second pressure roller and the predetermined time.
5 more elements
Dependencies are inferred from the claim text.