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US 5,782,178 AGranted
Stencil printer
AssigneeTohoku Ricoh Co., Ltd.
InventorTomoya Otomo
Life of this patent
Estimating the term…
Abstract
A stencil printer of the present invention is selectively operable in a simplex print mode or a duplex print mode and includes two drums. The drums each has a respective master support on its circumferential surface. The master supports of the two drums are movable into and out of contact with each other without the distance between the shafts of the drums being changed. In the duplex print mode, the master supports contact each other with the intermediary of a paper so as to print images on both sides of the paper at the same time. The printer obviates noise and insures high image quality.
Claims15
A stencil printer comprising:
- a first drum including a first flexible master support;
- a second drum including a second flexible master support and having a circumferential surface adjoining said first drum;
- first ink feeding means arranged in said first drum and including a first ink roller capable of rotating in pressing contact with an inner periphery of said first master support;
- second ink feeding means arranged in said second drum and including a second ink roller capable of rotating in pressing contact with an inner periphery of said second master support;
- and
- control means for controlling said first and second drums and said first and second ink feeding means;
- said first ink roller or said second ink roller being supported by said first ink feeding means or said second ink feeding means in such a manner as to be movable between an inoperative position not causing said first and second master supports to contact each other and an operative position causing said first and second master supports to pressingly contact each other;
- said control means moving, when a paper is passed between said first and second drums for printing, at least one of said first and second ink rollers from said inoperative position to said operative position to thereby bulge said first master support or said second master support, whereby said first and second master supports are brought into pressing contact with each other with the intermediary of the paper.
5 more elements
A stencil printer comprising:
- a first drum including a first flexible master support;
- a second drum including a second flexible master support and having a circumferential surface adjoining said first drum;
- first ink feeding means arranged in said first drum for feeding ink to said first drum, and including a first ink roller selectively movable between a first inoperative position preventing said first master support from contacting said second master support and a first operative position bulging said first master support into pressingly contact with said second master support;
- second ink feeding means arranged in said second drum for feeding ink to said second drum, and including a second ink roller selectively movable between a second inoperative position preventing said second master support from contacting said first master support and a second operative position bulging said second master support into pressing contact with said first master support;
- first ink roller moving means for moving said first ink roller from said first inoperative position to said first operative position;
- second ink roller moving means for moving said second ink roller from said second inoperative position to said second operative position;
- and
- control means for causing, when a paper is passed between said first and second drums for printing, said first and second ink roller moving means to respectively move said first and second ink rollers to said first and second operative positions to thereby bulge said first and second master supports into pressing contact with each other with the intermediary of the paper.
5 more elements
A stencil printer as claimed in 6, wherein said first and second drums are caused to rotate in synchronism with each other by a single driving means.
A stencil printer comprising:
- a first drum including a first flexible master support;
- a second drum including a second flexible master support and having a circumferential surface adjoining said first drum;
- first ink feeding means arranged in said first drum and including a first ink roller capable of rotating in pressing contact with an inner periphery of said first master support;
- second ink feeding means arranged in said second drum and including a second ink roller capable of rotating in pressing contact with an inner periphery of said second master support;
- and
- control means for controlling said first and second drums and said first and second ink feeding means;
- said first ink roller or said second ink roller being supported by said first ink feeding means or said second ink feeding means in such a manner as to be movable between an inoperative position spaced from the inner periphery of said first master support or said second master support and an operative position pressingly contacting said inner periphery;
- said control means moving, when a paper is passed between said first and second drums for printing, said first ink roller or said second ink roller from said inoperative position to said operative position to thereby bulge said first master support or said second master support, whereby said first and second master supports are brought into pressing contact with each other with the intermediary of the paper.
5 more elements
Dependencies are inferred from the claim text.