Hitachi Koki Co., Ltd.

Teruo Suzuki

Shinki Ohtsu

Takuji Torii

Masao Miyasaka

Tsuneki Kobayashi

Toshifumi Kubota

Yo Kawakami

Hiromu Utsumi

Tsunehisa Terayama

Yoshinori Ishizawa

Akira Uno

Yoshimitsu Kawasaki

Yasuyuki Hirano

A combustion gas powered tool includes a member defining a part of cylindrical combustion chamber having an axis. A piston is movable in a direction along the axis of the combustion chamber. The piston defines the combustion chamber in conjunction with the member. A mixture of air and fuel is generated in the combustion chamber. The air-fuel mixture in the combustion chamber is burned to drive the piston. An orifice grille extends in the combustion chamber, and is parallel to the axis of the combustion chamber.

Combustion gas powered tool

A combustion gas powered fastener driving tool includes inlet and outlet openings through which the combustion gases are discharged from a combustion chamber. These openings are located above the uppermost driving position (top dead center) of a slidable piston, so that an air and fuel mixture is fully trapped in the combustion chamber until after it is combusted. Since an outflow of the unburnt air and fuel mixture is completely prevented, the rate of fuel consumption of the fastener driving tool is high and there is no danger of accidental explosion of unburned fuel even when the fastener driving tool is used in a badly ventilated working place or site. An electric fan for forcing fresh air into the combustion chamber is disposed outside the cylinder and isolated from high temperatures. The fan is durable in structure and reliable in operation.

Combustion gas powered fastener driving tool

An apparatus for feeding a paper having holes utilizes an endless belt which contains a plurality of pins which are mounted so that they are positioned to a side of an outer periphery of the endless belt. The pins fit into holes in the paper to feed the paper as the endless belt is driven by two main pulleys. An auxiliary pulley is rotatably mounted on one of the shafts which supports one of the main pulleys in such a manner that the auxiliary pulley confronts and supports the bottoms of the pins, thus preventing the pins from being deflected inward. Because the auxiliary pulley is driven with one of the main pulleys, friction between the bottoms of the pins and the auxiliary pulley is minimized.

Tractor apparatus for feeding paper

A clamping device for a printer has a plurality of sideways-slippage preventing rollers housed in a roller housing which is fixed to a rear face of a wall of a ribbon shield. These preventing rollers prevent the printing paper from slipping sideways during a printing operation. A plurality of pressing plates are fixed on a hammer cover and biased towards the preventing roller by springs. A printing paper travels between the preventing rollers and the pressing plates, and the preventing rollers are oriented to rotate in the direction in which the printing paper travels. Since the preventing rollers prevent the printing paper from slipping sideways during printing, the printing lines are aligned properly. The preventing rollers also exert a minimum forward clamping force on the printing paper, which thus prevents the paper from tearing.

Paper clamp device for a printer

Growing community of inventors

Hitachi, Japan

Teruo Suzuki