Patent ID: 7438289

Claim:
A sheet material stacking apparatus comprising: a conveying device configured to convey a sheet material; a rotatable blade-type runner configured to allow the sheet which is conveyed by the conveying device to enter into a blade-to-blade space while being rotated and guide the sheet toward a predetermined direction; a scraping-out device configured to allow the sheet which is guided through the rotation of the runner to abut thereagainst and scrape the sheet out of the blade-to-blade space; a stacking section configured to allow the sheet which is scraped out by the scraping-out device to the stacked therein; a first detecting device configured to detect the sheet which is conveyed by the conveying device; a second detecting device configured to detect the sheet which reaches the scraping-out device through the rotation of the runner; a control device configured to, after a passage of a predetermined time following the detection of the sheet by the first detecting device, start detecting the sheet by using the second detecting device, and to stop stacking the sheet when the second detecting device detects no sheets; and a third detecting device configured to detect the blade of the rotating runner, wherein, after the detection of the sheet by the first detecting device, the control device starts the detection of the sheet by the second detecting device based on the detecting of a predetermined number of, as detected by the third detecting device.