Yazaki Corporation

Hiroshi Murashita

Norio Kawamura

Kenji Takahashi

Takashi Masuda

Kazuhiko Hiraguchi

Toshimi Nakashima

Junichi Hamamoto

Junich Hamamoto

Fumio Asai

Yoshiyuki Akiyama

Toshihiro Kitagawa

A molding and tentatively retaining mold of the invention has a plurality of molds which are relatively movable with respect to a fixed mold, and molds a housing and rear holders and , which are respectively independent, in a plurality of cavities formed in cooperation with the fixed mold. When the rear holders and are relatively moved with respect to the housing by a pair of rear-holder tentatively retaining cylinders after molding, and are tentatively retained, the amount of movement of a pair of third movable molds is set to be greater by a predetermined amount than an amount of movement necessary for tentatively retaining the rear holders and , and the third movable molds after movement are stopped at the moved positions until a predetermined time elapses.

Molding and tentatively retaining mold and method of molding and tentative retention

A molding machine comprising an injection portion with an injection nozzle which injects a molding material, a turntable comprising a rotation driving apparatus, a plurality of molds placed along a peripheral edge of the turntable, an attaching and detaching station, an injection station and a plurality of curing stations. Each mold comprises a material receiving port communicating with the injection nozzle when the mold is positioned at the injection station. Each mold further comprises a mechanism which close the material receiving port so as to prevent the molding material from flowing backward when the mold is separated from the injection nozzle. The molds are transferred by rotation of the turntable to each station one by one. Primary formed products are attached to the molds at the attaching and detaching station, injected at the injection station, cured to be second formed products at the curing stations and finally took out at the attaching and detaching station.

Molding machine

A molding and tentatively retaining mold of the invention has a plurality of molds which are relatively movable with respect to a fixed mold, and molds a housing and rear holders and which are respectively independent, in a plurality of cavities formed in cooperation with the fixed mold. When rear holders and after molding are relatively moved with respect to a housing by movable molds and and are tentatively retained, a runner for a cavity for molding the housing is kept connected to the housing through a tunnel gate In addition, a portion of the fourth movable mold for forming the cavity in the housing is kept fitted to the housing as it was during molding.

In a production apparatus ( ), after rear holders ( ) and a housing body ( ) are molded by molding die cavities, slides ( ) are moved apart from the housing body ( ). Then, cylinders ( ) are driven to move the rear holders ( ), holders ( ) and the slides ( ) together with slide plates ( ), so that the rear holders ( ) are located in opposed relation to the housing body ( ). Then, cylinders ( ) are driven to move the rear holders ( ) toward the housing body ( ), thereby provisionally retaining the rear holders ( ) on the housing body ( ). Therefore, the amount of movement of the slides ( ) is small, and it is not necessary to provide any space for holding the slides ( ), moved into their respective stand-by positions, and therefore the small-size design of the production apparatus can be achieved, and also the production efficiency can be enhanced.

Growing community of inventors

Shizuoka, Japan

Hiroshi Murashita