IMAGE FORMING APPARATUS, PROGRAM, AND LIFE DETERMINATION METHOD
FIG10 is a flowchart showing the operation of an image forming apparatus in a modification example 2
FIG10 is a flowchart showing the operation of the image forming apparatus 1 in the embodiment. The processing in FIG10 is achieved by a cooperation between the controller 10 and the program stored in the storage 17.
flowchart
166
second sensor
164
separating roller
162
pickup roller
163
sheet feeding roller
165
first sensor
161
tray
['1. An image forming apparatus (1) comprising: a sheet feeding roller (163) which feeds a sheet (P) accumulated on a tray (161); a speed detector (10) which detects a movement speed of the sheet that is currently fed by the sheet feeding roller; and a life determiner (10) which calculates a difference amount between the movement speed and a first reference speed, and determines a life of the sheet feeding roller based on the difference amount, wherein the life determiner determines whether or not to use the movement speed of a first sheet (PO) for life determination based on a relationship between the movement speed of the first sheet and the movement speed of a sheet which is fed before the first sheet, and if the life determiner determines not to use the movement speed of the first sheet for the life determination, the life determiner calculates the difference amount by excluding the movement speed of the first sheet.', '7. The image forming apparatus according to any one of claims 2 to 4, comprising a second sensor (166) which is arranged downstream of the first sensor in the conveyance direction of the sheet and detects arrival of the front end of the sheet which is fed, wherein the first sensor is arranged at a position which is downstream of the sheet feeding roller in the conveyance direction of the sheet and at which a distance from the sheet feeding roller is shorter than a length of the sheet in the  conveyance direction, the speed detector detects, as a first movement speed, the movement speed from start of sheet feeding of the sheet by the sheet feeding roller to detection of the front end of the sheet by the first sensor, and the speed detector detects, as a second movement speed, the movement speed from the detection of the front end of the sheet by the first sensor to detection of the front end of the sheet by the second sensor.']