Canon W6400 Series Service Manual

Contents

Chapter 22-22F-2-24d) Cut sheet feeding when skew detection is offWhen skew detection is off, media width detection which is performed at the trailing edge of the media is performed simply to determine the position forthe next media leading edge detection and the actual media width used for printing is detected at the trailing edge of the media after media leading edgedetection.Cut sheets that are loaded on the platen are transported by the feed rollers.When cut sheets are loaded with the cut sheet option selected, the upper cover is closed by returning the media release lever, and then the sheet type is set,the feed motor turns forward and the media sensor detects the trailing edge of the cut sheets loaded on the platen.After calibrating the registration sensor in this state, media leading edge detection and media width detection are performed and then the cut sheet is stoppedat the print standby position.The cut sheets are then fed by a length equivalent to the margin of the leading edge, and printing is started. Feeding of the cut sheets during printing isperformed by controlling the rotation of the feed rollers according to the printing mode.Media leading edgedetection (continued)1) Feed the mediaforward and detectthe media leadingedge.Media skewingdetection1) Move the media sensor over the platen at themedia left edge and feed the media 50mm forward.2) Detect the left edge of the media (temporarily stopforward movement of the carriage when detected),compare with the media left edge determinedduring media width detection and determine theskew amount.Media skewing detection 1) Detect the media left edge(temporarily stop forward movementof the carriage when detected).Compare with the media left edgedetermined during media widthdetection to determine the skewingamount.Media leading edgedetection (shutdown)1) Move the registration sensor overthe platen at left edge of the media.Media trailingedge detection1) Feed the media forward and tentatively detect the media trailing edge with the mediasensor (temporarily stop feeding when detected).2) Feed the media backward and detect the media trailing edge with the media sensor(stop feeding when detected).Media leading edgedetection (recovery)1) Move the media sensor to the leadingedge detection interrupt position.2) Feed the media backward andtentatively detect the media leadingedge (stop feeding when detected).3) Feed the media forward and detectthe media leading edge (stop feedingwhen detected).Registrationsensor calibration1) Move the registration sensor over the media.2) Determine the sensor output and check the sensor input value over the media checked.3) Move the registration sensor over the platen.4) Check the sensor input value over the platen.This is performed each time the media is loaded since the sensor input value varies dependingon the media type.Media leadingedge detection (start)1) Move the registration sensor over the media.2) Feed the media 300 mm in the backward direction (stop feeding when detected).Paper width detection 1) Detect the media left edge (temporarily stop forward movement of the carriage whendetected).2) Tentatively detect the media right edge (stop forward movement of the carriage whendetected).3) Detect the media right edge (temporarily stop return movement of the carriage whendetected).Leading edge detection Unable to detectDetectedEnd cut sheet feedingStart cut sheet feedingPrint standby positionPrint