Imaging device of correcting longitudinal alignment, and its correction method

Abstract

An image forming device has a first calculator applying any one of setting values for plural alignment patterns pre-set corresponding to magnitudes of feeding error values according to feeding amounts of a printing sheet of paper by feeding rollers and calculating first correction values for the feeding error values depending upon operation modes, a second calculator calculating second correction values for the feeding error values depending upon the printing sheet, and a controller controlling the feeding rollers to be driven to correct the feeding error values depending upon the operation modes and the printing sheet using the first and second correction values calculated by the first and second calculators. Accordingly, the image forming device can correct the feeding error values depending upon the operation modes, the printing sheet, and the printing position sections, thereby obtaining a best quality images in the respective modes.

Description

[0001] This patent application is a divisional application of the patent application with the filing date of May 26, 2003, the application number of 03137838.2, and the title of "imaging device for correcting vertical alignment and its correction method". technical field [0002] The present invention relates to an imaging device, in particular to an imaging device capable of correcting longitudinal alignment, and a correction method thereof. Background technique [0003] Generally speaking, an image forming apparatus such as a photocopier, a scanner, a printer, etc. picks up a sheet of printing paper one by one from a paper supply cassette, transfers the printing sheet through a predetermined conveying path, and moves the printing sheet to a driving feeding roller (feeding roller). roller) to feed the feeding position of the printed page. The feeding roller driven by the controller according to the printing command conveys the printing page at the feeding position at an app...

AI Technical Summary

Problems solved by technology

And, the printing position part of the printed page is divided into a first part where the printed page is inserted into the pickup roller and the feed roller, a second part where the printed page is inserted into the pickup roller, the feed roller and the exit roller, and a printed page is inserted into the feed roller and the exit roller. The third section in the roller, and the fourth section where the printed page is inserted into the exit roller, and, at the moment the printed page is inserted into each section, there is a phenomenon that causes the printed page to go over the top

[0013] Then, for the feed error value that appears different depending on the print mode, print page, and print position section, the feed error value was corrected all at once using a predetermined correction value in the past, so that the feed error value could not be accurately corrected.

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