MULTI FEEDING DETECTION DEVICE, IMAGE FORMATION DEVICE AND MULTI FEEDING DETECTION METHOD

摘要

The present invention relates to multi-feed the presence or absence of the sheet-like member to be conveyed in a wide range of conditions with high accuracy detection It can be in. The double feed whether the A sheet 261 is transported, the double feed detection device 200 for detecting by using an ultrasonic wave, ultra is irradiated with ultrasonic waves to the paper 261 a wave irradiation unit 203, a detector 204 for ultrasonic irradiator 203 receives the secondary radiation of the ultrasonic wave irradiated to the sheet 261, once in the double feed detection, one of the received signal detector 204 receives The second detecting unit and the first detecting unit 250, in the double feed detection of one, for detecting the double feed whether based on multiple received signals detector 204 is received to detect the presence or absence of a double feed on the basis of as well and a 251, based on a predetermined condition, and includes a first detecting unit 250 and switching unit 213 for switching the second detecting portion 251.BACKGROUND 2