Sheet feeding or delivering – Feeding – By means to convey sheet
Reexamination Certificate
2000-01-19
2001-11-06
Ellis, Christopher P. (Department: 3651)
Sheet feeding or delivering
Feeding
By means to convey sheet
C399S364000, C400S579000
Reexamination Certificate
active
06311972
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of Invention
This invention relates to methods and systems that control the feed out of a receiving substrate.
2. Description of Related Art
Various imaging systems include transport paths. Receiving substrates that will receive an image are conveyed along the transport paths and imaged. In duplex copying, the receiving substrates are fed into the transport path. Movement of the receiving substrates through the transport path is controlled so that the receiving substrates receive images. Receiving substrates receive images by passing along a transport path through an imaging station.
Multipass printing, such as duplex printing, is used to print images on a receiving substrate. For example, in duplex printing, images are formed on both sides of a receiving substrate.
Many imaging systems that are capable of duplex printing include receiving substrate transport paths in the shape of a loop. The scheduling process involves: a) inserting a receiving substrate into the loop; b) forming an image on a first side of the receiving substrate at an imaging station; c) inverting the receiving substrate so that a second side of the receiving substrate will face the imaging station when the receiving substrate is reconveyed past the imaging station; d) forming an image on the second side of the receiving substrate at the imaging station; and e) outputting the receiving substrate from the receiving substrate transport path loop toward a final destination, such as a tray, a binder, finishing devices, or the like.
SUMMARY OF THE INVENTION
Misregistration of a developed image on the receiving substrate, even if only a few mils or tens of microns, is well within the acuity of the human eye. Since the human eye can sense this misregistration, the quality of the resulting image suffers greatly even for small misregistration errors.
This invention provides imaging methods and systems wherein a developed image is to be substantially registered onto a receiving substrate.
This invention separately provides methods and systems that include a feed out controller that controls the feed out of the receiving substrate from an inverting station.
In accordance with the systems and methods of this invention, problems in registration, such as incorrect registration of a developed image with a receiving substrate, are reduced or eliminated.
This invention separately provides an image processing device that includes a feed out controller sensors mounted in the transfer station and a controller to determine the required adjustments to feed out.
The methods and systems of this invention improve the registration of the images onto the receiving substrate.
According to the systems and methods of this invention, registration errors that occur due to the misregistration of the developed images onto the receiving substrates can be reduced or eliminated by the application of the feed out controller.
In various exemplary embodiments of the systems and methods of this invention, a method of scheduling receiving substrates in a duplex copy mode includes transporting first and second receiving substrates along a transport path.
In various exemplary embodiments of the systems and methods of this invention, feeding out the receiving substrate from the inverter station is adjusted based on a determined relationship between the trailing edge of the first receiving substrate and the leading edge of the second receiving substrate at the registration station and the inverting station. In various other exemplary embodiments of the systems and methods of this invention, the stop time of the inverting roller is adjusted based the determined relationship.
The feed out controller determines the trailing edge/leading edge relationships and then monitors the relationships during the print run. As the trailing edge/leading edge relationships change from nominal values, the feed out controller determines and applies the necessary adjustments to the inverting roller stop time to keep the developed images and the receiving substrates registered.
These and other features and advantages of this invention are described in or are apparent from the following detailed description of various exemplary embodiments of the systems and methods according to this invention.
REFERENCES:
patent: 4873547 (1989-10-01), Sasaki et al.
patent: 5423527 (1995-06-01), Tranquilla
patent: 5560595 (1996-10-01), Kulpa
patent: 5687010 (1997-11-01), Van Tilborg et al.
patent: 5921539 (1999-07-01), Westcott et al.
patent: 5934661 (1999-08-01), Kameyama
patent: 5957598 (1999-09-01), Berkers et al.
Bower Kenneth W
Ellis Christopher P.
Oliff & Berridg,e PLC
Xerox Corporation
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