초록 ▼

A four-sided turret interposed between a fixed and a movable platen of an injection-molding machine, mounted on a carriage which is slidable in the direction of platen motion, is rotatable about an axis perpendicular to that direction into four operative positions spaced 90°apart. In each of these p

A four-sided turret interposed between a fixed and a movable platen of an injection-molding machine, mounted on a carriage which is slidable in the direction of platen motion, is rotatable about an axis perpendicular to that direction into four operative positions spaced 90°apart. In each of these positions, in which one or more cores carried on one of its faces enter respective cavities of a confronting mold plate on the fixed platen while a corresponding core or cores on an opposite face are received in a companion plate on the movable platen, the turret is positively indexed by two aligned pins on these plates which enter respective bores in the turret upon closure of the mold; such closure, conversely, is prevented by the pins until the turret is in the proper position. The core or cores on each turret face may traverse a respective stripper plate overlying that face or may be penetrated by ejector pins carried on a relatively movable holding plate; after a workpiece molded around a core of any such face has been rotated through three turret positions, rollers linked with the associated stripper or holding plate are engaged by a pair of cam bars on the two platen-associated plates during a mold-closing stroke to dislodge the molded workpiece from its core.

대표청구항 ▼

An injection-molding machine comprising: a pair of relatively movable platens; a mold plate with at least one cavity on one of said platens communicating with a source of plastic material for forming a workpiece in said cavity upon relative movement of said platens toward each other into a mold-clos

An injection-molding machine comprising: a pair of relatively movable platens; a mold plate with at least one cavity on one of said platens communicating with a source of plastic material for forming a workpiece in said cavity upon relative movement of said platens toward each other into a mold-closed position; a turret with at least four faces rotatable into as many operating positions about an axis transverse to the path of platen motion, said turret being shiftable along said path between said platens upon relative movement of said platens away from each other into a mold-open position and being provided with a core on each of said faces receivable in said cavity in a respective operating position for extracting a freshly molded workpiece from said path of platen motion; indexing means including coacting formations on at least one of said platens and on said turret for positively locking said turret in any operating position during incipient relative movement of said platens into said mold-closed position; a companion plate on the other of said platens confronted by one of said faces in any operating position of said turret and adapted to receive the core of the confronting face during mold closure; and ejection means on each of said faces for removing a workpiece from a respective core, at least one of said platens being provided with actuating means effective during a mold-closing stroke to engage the ejection means on a face of said turret not confronting either of said mold and companion plates for dislodging a workpiece in a direction away from said path.