Sheet registration for a multipass electrophotographic printer
AssigneeEastman Kodak Company
InventorJames D. Shifley
Life of this patent
Estimating the term…
Abstract
A method and system for printing image documents using a variety of toners where some toners using a multi-development station having two or more development stations. These toners are co-printed prior to fixing, on the receiver by the multi-development station.
Claims23
A method of correcting for misregistration of images printed on a receiver sheet resulting from multiple transfers during simplex imaging comprising:
- a. establishing one or more actual positions of the receiver sheet relative to a primary imaging member by one or more of determining a position of an in-track front edge of a receiver sheet traveling on a paper path through a printer using a sensor, determining a position of an in-track rear edge of the receiver sheet with a second sensor, and determining a position of one of a cross track edges with a third sensor array;
- b. establishing a look up table (LUT), including content representing an actual position of the receiver sheet;
- c. comparing one or more measured positions with the LUT content representing reference positions;
- d. determining a correction factor from a difference between reference positions and measured positions of one or more of the in-track front and rear and the cross track positions;
- e. adjusting a position of an electrostatic latent image on the primary imaging member by varying a writer output to compensate for the correction factor and;
- wherein the method is implemented by one or more controllers for updating the LUT.
A method of correcting for misregistration of images printed on a receiver sheet resulting from multiple transfers during simplex imaging comprising:
- a. establishing one or more actual positions of the receiver sheet relative to a primary imaging member by one or more of determining a position of an in-track front edge of a receiver sheet traveling on a paper path through a printer using a sensor, determining a position of an in-track rear edge of the receiver sheet with a second sensor, and determining a position of one of a cross track edge with a third sensor array;
- b. establishing a look up table (LUT), including content representing an actual position of the receiver;
- c. comparing one or more measured positions with the LUT content representing reference positions;
- d. determining a correction factor from a difference between reference positions and measured positions of one or more of the in-track front and rear and the cross track positions;
- e. adjusting the position of an electrostatic latent image on the primary imaging member by varying a writer output to compensate for the correction factor wherein the method is implemented by one or more controllers for one or more of updating the LUT, comparing the measured positions with the reference positions in the look up table, determining the correction factor from the difference between the reference positions and the measured positions of the in-track front and rear edges and the cross track edge, and adjusting the position of the electrostatic latent image on the primary imaging member by varying the writer output.
An electrophotographic print engine comprising a single development station, at least one multi-development station having two or more development stations;
- two or more primary imaging members such that a number of primary imaging members is less than a number of development stations;
- and a controller for correcting misregistration of images printed on a receiver during printing further comprising content on the controller to predict one or more errors based on one or more sensor readings and a look up table (LUT) for multiple conditions and substrate types.
Dependencies are inferred from the claim text.