Injection moulding machine comprising: - a movable moulding platen, - a fixed moulding platen, - a fixed support plate, and - a clamping unit having = a drive element which is preferably driven parallel with the infeed direction of the movable platen in order to introduce an actuating force into the clamping unit, and = a linkage assembly between the support plate and the movable platen, which, for transmitting the movement of the drive element to the movable platen in the context of an infeed movement of the movable platen relative to the fixed platen, is connected in an articulated manner to the drive element, and - a configuration of the linkage assembly having three control arms (13, 14, 15) intercoupled in an articulated manner, comprising = an auxiliary control arm which is articulated on the support plate, = a central control arm which is articulated on said auxiliary control arm and is coupled to the drive element, and = an output control arm interdisposed between the central control arm and the movable platen, characterized by a coupling of the control arms (13, 14, 15) such = that the articulation axis between the central control arm and the output control arm runs on a non-circular motion path, and = that in a closing position of the movable platen the four articulation axes (16, 17, 18, 19) of the linkage assembly which are in each case formed between the support plate, the control arms (13, 14, 15), and the movable platen lie on a straight line which is perpendicular on a reversal point tangent on the motion path of the articulation axis between the central control arm and the output control arm. - a movable moulding platen, - a fixed moulding platen, - a fixed support plate, and - a clamping unit having = a drive element which is preferably driven parallel with the infeed direction of the movable platen in order to introduce an actuating force into the clamping unit, and = a linkage assembly between the support plate and the movable platen, which, for transmitting the movement of the drive element to the movable platen in the context of an infeed movement of the movable platen relative to the fixed platen, is connected in an articulated manner to the drive element, and = a drive element which is preferably driven parallel with the infeed direction of the movable platen in order to introduce an actuating force into the clamping unit, and = a linkage assembly between the support plate and the movable platen, which, for transmitting the movement of the drive element to the movable platen in the context of an infeed movement of the movable platen relative to the fixed platen, is connected in an articulated manner to the drive element, and - a configuration of the linkage assembly having three control arms (13, 14, 15) intercoupled in an articulated manner, comprising = an auxiliary control arm which is articulated on the support plate, = a central control arm which is articulated on said auxiliary control arm and is coupled to the drive element, and = an output control arm interdisposed between the central control arm and the movable platen, characterized by a coupling of the control arms (13, 14, 15) such = that the articulation axis between the central control arm and the output control arm runs on a non-circular motion path, and = that in a closing position of the movable platen the four articulation axes (16, 17, 18, 19) of the linkage assembly which are in each case formed between the support plate, the control arms (13, 14, 15), and the movable platen lie on a straight line which is perpendicular on a reversal point tangent on the motion path of the articulation axis between the central control arm and the output control arm. = an auxiliary control arm which is articulated on the support plate, = a central control arm which is articulated on said auxiliary control arm and is coupled to the drive element, and = an output control arm interdisposed between the central control arm and the movable platen, = that the articulation axis between the central control arm and the output control arm runs on a non-circular motion path, and = that in a closing position of the movable platen the four articulation axes (16, 17, 18, 19) of the linkage assembly which are in each case formed between the support plate, the control arms (13, 14, 15), and the movable platen lie on a straight line which is perpendicular on a reversal point tangent on the motion path of the articulation axis between the central control arm and the output control arm.