Bridgestone Corporation

Kabushiki Kaisha Bridgestone

Takashi Ishiwatari

Koji Okuyama

Jun Nagano

Conveyor device

A positive displacement extruder for a viscous material, such as unvulcanized rubber, includes a feed member arranged in a chamber of a main body and driven for rotation so that the viscous material charged into the chamber is extruded from its outlet. A mouthpiece has an inlet that is spaced in a circumferential direction from the outlet of the main body and, in communication therewith, an extrusion nozzle. At least one cylinder device is rotatable about a center axis of the extruder so that the cylinder is alternately bought into communication with the outlet of the main body and the inlet of the mouthpiece. The viscous material is charged from the chamber of the main body into the cylinder device and discharged from the cylinder device into the mouthpiece, as the cylinder device is rotated about the center axis of the extruder and the piston of the cylinder device is driven by a cam device to reciprocate in the cylinder.

Positive displacement extrusion of viscous material

The front end and rear end of a belt-shaped member having a predetermined length are grasped by front end grasping pawls and rear end grasping pawls, respectively, movable in synchronism with and independently from each other when required. The front and rear end grasping pawls are moved in synchronism with each other until the front end of the belt-shaped member arrives at the forming drum. After the front end of the belt-shaped member has been pressure-joined with the forming drum, only the rear end grasping pawls grasping the rear end of the belt-shaped member are moved to attach the belt-shaped member to the circumference of the forming drum. The length of the belt-shaped member is modified to a predetermined length or the circumferential length of the forming drum while the front and rear ends are grasped by the front and rear end grasping pawls, respectively, or the belt-shaped member is being attached to the forming drum.

Growing community of inventors

Tokyo, Japan

Takashi Ishiwatari