Riso Kagaku Corporation

Shuntaro Yoshida

Takanori Hasegawa

Takao Sato

Susumu Oshio

Takanobu Shimada

Masakazu Kera

Shinichi Shimoyama

The stencil duplicator includes: a cylindrical porous rotary printing drum and a means for selectively rotating it in a preferred direction; a means for clamping the leading edge of a stencil master along a generator of the printing drum; a means for supplying printing ink to the inner surface of the printing drum; a press roller means for pressing a paper sheet to the outer surface of the printing drum with a progressive rolling action; a means for feeding a paper sheet between the printing drum and the press roller means; a means for making a stencil master, including a light transmitting plate, a light source which selectively illuminates the light transmitting plate, and a pressure plate facing the light transmitting plate, with the light transmitting plate and the pressure plate being selectively able either to be separated or pressed together; a means for feeding the leading edge of a stencil master which has passed between the light transmitting plate and the pressure plate towards the clamping means so that it may be clamped thereby; and a means for controlling operation so that, when the light transmitting plate and the pressure plate are separated from one another with a stencil master interposed therebetween, the printing drum is rotated and by pulling via the clamping means on the leading edge of the stencil master withdraws it and wraps it around the printing drum.

Stencil duplicator providing automatic stencil performation, charging,

A method for exposing a sheet to light radiation while it is under pressure, in which successive portions of the sheet which slightly overlap one another are sequentially clamped between a pressure plate and a light transmitting plate, and are irradiated with electromagnetic radiation through the light transmitting plate in the clamped condition. Further, a device for practicing the method is disclosed, which includes: a light source; a light transmitting plate arranged with the light source on one of its sides; a pressure plate which opposes the other side of the light transmitting plate; a member for relatively biasing the light transmitting plate or the pressure plate towards and away from each other; a device for transporting the sheet passing between the light transmitting plate and the pressure plate; and a control for controlling the light source, the biasing member, and the transporting device, which causes the light source to emit light when the pressure plate and the light transmitting plate are pressed against each other with the sheet between them, and which causes the transporting device to transport the sheet through a distance less than the width of the light transmitting plate, when the light transmitting plate and the pressure plate are separated by more than a certain predetermined distance.

Divided exposure method and device

Growing community of inventors

Tokyo, Japan

Shuntaro Yoshida