Riso Kagaku Corporation

Tadayuki Igarashi

Susumu Oshio

To the end of reliably and accurately detecting a failure to properly eject a master plate and positively preventing the occurrence of secondary failures due to a failure to properly eject a master plate, the passage of both the leading edge and the trailing edge of the ejected master plate beyond a prescribed point in the conveying path of ejected master plates is used as an indication of a successful ejection of a master plate. An ejected master plate sensor for detecting the presence of a master plate in a path for conveying a stencil master plate to an ejected master plate receiving box is provided in the conveying path, and the state of the ejected master plate sensor is monitored if the change of its state from the one indicating the absence of a master plate to the one indicating the presence of a master plate is followed within a prescribed time period by the change of its state from the one indicating the presence of a master plate to the one indicating the absence of a master plate so that a start of a next operation may be permitted when such a sequence of the change of the state of the stencil master plate detecting sensor took place, and a start of a next operation may be otherwise prohibited as being a case of a failure to properly eject a stencil master plate.

Growing community of inventors

Tokyo, Japan

Tadayuki Igarashi