Patent ID: 7210918

Claim:
An injection molding machine comprising a toggle type mold clamping system, wherein a fixed platen and a rear platen are coupled to each other by a tie bar, a movable platen is guided by the tie bar so as to be movable between the fixed platen and the rear platen, and the toggle type clamping mechanism comprises a toggle mechanism which is positioned between the rear platen and the movable platen and which is stretched and contracted, said injection molding machine comprising: means for contracting said toggle mechanism as much as the amount corresponding to a mold clamping force which is set in advance; means for moving the rear platen forward toward the fixed platen in a state in which said toggle mechanism is contracted; means for detecting that a movable mold half attached to the movable platen touches a fixed mold half, which is attached to said fixed platen, by moving said rear platen forward; and means for moving the rear platen backward along the tie bar as much as the amount of stretch of the tie bar generated from the mold touch, when it is detected that said movable mold half touches the fixed mold half.