Patent ID: 9193548
Filing Date: 2015-11-24
Classification: B65H

Abstract:
1. A sheet supply device comprising: a lifting plate made of a flexible material and liftably mounted on a sheet stacking surface; a driving unit for driving up and down the lifting plate; a pickup roller placed above the lifting plate and for feeding the sheet abutting on an upper surface of the sheets loaded on the lifting plate; a sensor for detecting an arrival of the sheet fed by the pickup roller on a downstream side of the pickup roller; a paper remaining amount detection unit for determining a remaining amount of sheets loaded on the lifting plate; a controller for controlling the sheet supply device; an abnormality detection unit for monitoring whether or not a time between a drive start time of the pickup roller and a sheet detection time by the sensor is within a predetermined normal time; and an abnormality detecting condition correction unit for correcting an abnormality detecting condition concerning the predetermined normal time depending on the remaining amount of sheets detected by the paper remaining amount detection unit when the abnormality detection unit detects an abnormality indicating that the predetermined normal time has passed.