Apparatus for forming hollow article
AssigneeThe Japan Steel Works, Ltd.
InventorsTakaaki Kato, Kiyomi Suzuki, Shigeharu Hagiwara, Hiroaki Takanashi
Life of this patent
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Abstract
An apparatus for forming a hollow article, wherein all the operations such as shifting and opening/closing of a die are performed by electric actuators such as motors which operate in accordance with a program operation, thus improving the quality of the hollow article as the product. A parison extruded from an extruder is introduced into and held in a die which has been opened by the operation of a die compacting motor. A crosshead associated with the extruder is lifted to draw the parison, and a parison cutting motor operates to cut the drawn parison. Thus, fully automatic production is realized, to ensure high yield of the product.
Claims19
Apparatus for blow-molding a hollow article from moldable material, comprising
- an extruder having a crosshead for extruding said material downwardly to form a parison suspended from said crosshead;
- an openable and closable die for receiving and blow-molding said parison therein to form said hollow article, said die being movable between a parison-receiving position beneath said crosshead and an article-blowing position, and said die having a top aperture for surrounding said parison received in said die when said die is closed to permit said parison to remain suspended from said extruder crosshead;
- a compacting device having means driven by a first electric motor for opening and closing said die at either of its said positions;
- a die shifting device having means driven by a second electric motor for moving said die from either of its said positions to the other;
- a parison drawing device having means driven by a third electric motor for moving said extruder crosshead substantially vertically between a position adjacent to said die when in its said parison-receiving position with said parison received therein and suspended from said extruder crosshead and an upper position with respect to said die at said parison-receiving position to thereby draw said parison between said die and said crosshead;
- a parison cutting device including a parison cutter, means for heating said cutter, and means driven by a fourth electric motor for moving said cutter, when heated, horizontally between said die and said extruder crosshead to cut said drawn parison when said crosshead is in its said upper position;
- an air blowing device having a vertically movable air blowing nozzle adjacent to said article-blowing position of said die and having means driven by a fifth electric motor for moving said nozzle between a lower position thereof adjacent to said die top aperture and engaging said cut parison received in said die at said article-blowing position and a raised position thereof away from said die, and air blower means for blowing air through said nozzle when in its said lower position to blow-mold said parison in said die to form said hollow article.
Dependencies are inferred from the claim text.