Denso Corporation

Nippondenso Co., Ltd.

Nipponfrndo Co., Ltd.

Sojiro Tsuchiya

Hideto Takeda

Toshihiro Takahara

Hisatoshi Kojima

Nobuo Ota

Yoshihisa Sanami

Hiromichi Morita

Takeharu Maekawa

Atushi Kosaka

Takayoshi Muto

Goshin Ohashi

Shinzi Sugiura

Kenzo Kawasaki

Toshihiko Murase

Hironao Yamada

Masahito Sugiura

In a machine tool by pulse drive of a hydraulic system, a piston of a hydraulic cylinder is connected with a table, and an outflow valve and an inflow valve, which form a pair, are respectively connected with a right and a left hydraulic chamber. When the feed table is moved to the right, for example, control is conducted so that the valve-opening period of one valve can be a portion in the middle of the valve-opening period of the other valve. Since a portion of pressure in the hydraulic chamber is canceled, an effective pressure, the pulse width of which is narrow, remains. Accordingly, even in the case where a common inexpensive electromagnetic valve is used, it is possible to accomplish a smooth feed motion.

Table feed system

A filter element for use in an oil filter is composed of main fibers of at least 5 .mu.m diameter and micro fibers of less than 5 .mu.m diameter. The micro fibers are filled in a density of 0.005 to 0.02 g/cm.sup.3. A slurry including the fibers is drawn into a suction unit through suction openings to form a molded body. The filter element is given a density gradient such that the micro fibers are denser in the inner periphery than in the outer periphery. Following the drawing step, the molded body together with the inner mold is removed for subsequent dehydration and heating. During those processes the inner mold is kept located within the molded body.

Filter element and fabrication method for the same

An electromagnetically operated valve for injecting fluid comprises first guiding element connected to one end portion of a stationary iron core and containing a movable core slidably therein for guiding a movement of a movable valve connected to the movable core, and second guiding element for slidably guiding the movable valve in a position between a large-diameter portion and a seat portion of the movable valve. According to such fluid injection valve, as the movable core and movable valve are axially guided by first guiding means and second guiding element in the above respective positions, the wear of the stopper portion of the movable valve is lessened due to the outer force to the movable valve.

Electromagnetic valve for fluid injection

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Nagoya, Japan

Sojiro Tsuchiya