Riso Kagaku Corporation

Toshimitsu Sakai

Yasuhiro Takahashi

Takeshi Saitoh

Hideo Negishi

A stencil printing machine includes a thermal head for perforating a stencil sheet; a platen roller situated adjacent to the thermal head, the platen roller conveying the stencil sheet in a predetermined direction while holding the stencil sheet in contact with the thermal head; a printing drum situated near the thermal head and the platen roller, the printing drum being adapted to receive the stencil sheet perforated by the thermal head and the platen roller; and a discharging member situated near the platen roller on a downstream side of the predetermined direction relative to the thermal head and the platen roller, the discharging member discharging static electricity charged on the stencil sheet.

Stencil printing machine having static electricity discharging members

Strap-like step portions each having a smaller external diameter than the external diameter of an ink supply roller are provided at opposite ends of the ink supply roller provided in a drum. Guide surfaces of ink dams urged by springs are brought into contact with the strap-like step portions respectively. Inclined surfaces of the ink dams are brought into contact with the strap-like step portions and side end surfaces of the strap-like step portions respectively. Ink leaked onto the strap-like step portions is led to the inclined surfaces in conjunction with the rotation of the ink supply roller and returned to the inner side of the ink supply roller. Ink is prevented from being leaked out of the ink supply range of the ink supply roller, so that a printing apparatus and sheets of printing paper are not stained with ink. The state of contact between the ink dams and the ink supply roller is kept stable. If the elastic force of the springs is changed, the state of contact can be changed.

Stencil printing drum structure

A paper delivery apparatus of a printing machine includes a holding device having at least a pair of rotating members fitted, in the vicinity of both side edges of printed sheets, with a paper receiving section for holding the side edges of the printed sheets ejected from the printing machine, a driving device for rotating the rotating member to move downward in succession the printed sheets held on the paper receiving section. A paper stacking section disposed beneath the rotating body for holding the printed sheets which have been released from the paper receiving section; and a space between the paper receiving section for holding one side edge of the printed sheet and the paper receiving section for holding the other side edge of the printed sheet is set narrower at the lower part of the rotating member for discharging the printed sheet than at the upper part of the rotating member for receiving the printed sheet.

Growing community of inventors

Ibaraki-ken, Japan

Toshimitsu Sakai