Patent ID: 8182262

Claim:
An injection molding machine ( 1 ) comprising a stack mold ( 2 ) for producing injection molded parts said machine formed of a first partial pre-mold and a second partial pre-mold, a fixed exterior molding part ( 3 ), a rotationally or pivotally supported central block ( 5 ), and a movable exterior molding part ( 4 ), with molding cavities being formed between exterior molding areas ( 9 a , 9 b ) located at interior sides of the exterior molding parts ( 3 , 4 ) and interior molding areas ( 10 a , 10 b ) located at opposite exterior sides of the rotationally or pivotally supported central block ( 5 ), said central block ( 5 ) includes the interior molding areas ( 10 a ) at two of the exterior sides, located adjacent to each other in a rotary or pivotal direction, for forming the first partial pre-molds ( 8 a , 8 c , 8 e ) and the interior molding areas ( 10 b ) for forming the second partial pre-molds ( 8 b , 8 d ) are located at the two other of the exterior sides that are adjacent to each other, and the two exterior molding parts ( 3 , 4 ) each comprise the exterior molding areas ( 9 a , 9 b ) for forming a respective one of the first or second partial pre-molds ( 8 a , 8 b , 8 c , 8 d , 8 e ), the central block ( 5 ) is moveable in an oscillating manner in a clockwise and a counterclockwise direction between a first position, in which a first one of the interior molding areas ( 10 a ) for forming one of the first partial pre-molds is located adjacent to the exterior molding area ( 9 a ) of the fixed exterior molding part while a first one of the interior molding areas ( 10 b ) for one of the second partial pre-molds is located adjacent to the exterior molding area ( 9 b ) for the movable exterior molding part ( 4 ), and a second position, in which a second one of the interior molding areas ( 10 b ) for forming the first partial pre-molds is located adjacent to the exterior molding area ( 9 a ) of the fixed exterior molding part while a second one of the interior molding areas ( 10 b ) for one of the second partial pre-molds is located adjacent to the exterior molding area ( 9 b ) for the movable exterior molding part ( 4 ), and at least one gripper ( 11 a , 11 b ) each being provided for removing and holding one of the first partial pre-molds ( 8 a , 8 c , 8 e ) and for positioning a previously removed one of the first partial pre-molds ( 8 a , 8 c , 8 e ) at the second partial pre-mold ( 8 b , 8 d ) for connection thereto or to remove and hold a molded one of the second partial pre-molds ( 8 f , 8 g , 8 h , 8 i , 8 l ) and to insert a previously removed one of the first partial pre-molds ( 8 f , 8 g , 8 h , 8 i , 8 l ) into a molding area ( 10 b 1 , 10 b 2 ) for the second partial pre-molds ( 8 j , 8 k ) of the central block ( 5 ), the at least one gripper is located off-set in the rotary or pivotal direction in reference to the exterior molding parts ( 3 , 4 ).