Rotary type injection molding machine

Claim 1

In a rotary type injection molding machine having a mold pressuring device: A. a pair of rotatable plates which are disposed in fixed parallel planes and can be rotated in the vertical planes intermittently around a horizontal supporting shaft mounted on a base structure of the injection molding machine; B. a plurality of die plates with operating rods arranged between said pair of rotatable plates and around said supporting shaft in a radially spaced apart relationship with the die plates being movable freely on and between said pair of rotatable plates; C. a plurality of mateable mold halves, respectively mounted on one said rotatable plate and on said die plates; D. pressurizing cylinders of the same number as that of the die plates attached on the rear side of one of said rotatable plates at positions aligning with said die plates; E. each of said pressurizing cylinders having a piston rod extended forwardly to penetrate said one of the rotatable plates and connected integrally to a said operating rod of said die plate; F. each of said pressurizing cylinders having a fluid circulating path provided with one accumulator for reducing fluid pressure in one of said fluid chambers in said pressurizing cylinder, a check valve inserted in a part of the fluid path between said two accumulators, and transfer valve means inserted in said fluid path between the fluid chambers in each of said pressurizing cylinders; G. separate accumulator and valve means being severally mounted in operative connection with each said mold pressurizing cylinder fixedly attached on said one said plate; H. a pair of stationary memberS fixed to said base structure and mounting said supporting shaft; I. a device for intermittently rotating the rotatable plates; J. a mold opening-and-closing device which opens or closes the metal mold by movement of a said mold half on a said die plate by means of the mold operating rod which is connected to the piston in the mold pressurizing cylinder and also to the die plate; K. a hydraulic device for strongly clamping the metal mold halves together through said piston and die plate; L. said opening and closing and clamping devices being all disposed on said stationary members mounting said pressurizing cylinders; and M. an injecting device located in the lower portion of the other stationary member at a position opposing said mold clamping device.