Riso Kagaku Corporation

Osamu Kakurai

Masao Suzuki

Hiroyuki Sunagawa

Makoto Miyaki

A print medium feed device and a stencil printing machine employing the same are disclosed wherein a print medium as a print sheet, transferred with a pair of secondary paper feed rollers, is transferred through a pair of transfer guide members to a press drum by which transfer of the print medium is succeeded. An upper transfer guide member, with which the print medium is brought into sliding contact, is periodically shifted between a guide position to allow the print medium to be guided to the press drum, and an inoperative non-guide position in which the upper transfer guide member is separated from the other transfer guide member. A shaft of one secondary paper feed roller is exerted with a rotational braking effect by a torque limiter, whose rotational braking effect is periodically released by a clutch unit.

Print medium feed device and stencil printing machine

A stencil printer includes a rotary printing drum around which the stencil master is wrapped, a main motor which rotates the printing drum, a press roller which is rotatable in parallel to the printing drum in contact with the printing drum, and a pair of opposed conveyor rollers which feed a printing paper between the printing drum and the press roller so that the leading end of the printing paper meets the printing drum in a predetermined position of the printing drum. A conveyor roller motor is provided separately from the main motor and drives the conveyor rollers. A reference position sensor detects a reference position on the printing drum, a printing drum rotation detector detects rotation of the printing drum on the basis of the reference position, and a conveyor roller rotation detector detects rotation of at least one of the conveyor rollers. A conveyor roller controller controls the conveyor roller motor on the basis of the rotation of the printing drum and the rotation of the conveyor roller so that the leading end of the printing paper meets the printing drum in the predetermined position of the printing drum.

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Ibaraki-ken, Japan

Osamu Kakurai