Abstract: A mold closing unit for an injection molding machine or press; includes a drive mechanism, and a toggle mechanism having a first pair of linkages which are connected to one another at a first knuckle point. One linkage is connected to a stationary component at a second knuckle point and the other linkage is connected to a movable mold mounting plate at a third knuckle point. At least one of the linkages is operatively connected to the drive mechanism at a fourth knuckle point, wherein the fourth knuckle point is spaced from the first knuckle point by a first distance, and spaced from the second knuckle point by a second distance, wherein a sum of the first and second distances is greater than 1.2 times a distance between the first and second knuckle points.

Abstract: A two-platen injection molding machine with a stationary mold carrier plate and a movable mold carrier plate which are connected via tiebars having piston-cylinder units which build up and cancel the clamping force. At least one driving cylinder is arranged at the carrier plates for quick driving movement thereof. The tiebars are constructed as loose clamping pins forming the piston rod of the piston-cylinder units. The tiebars are guided through the movable mold carrier plate and the stationary mold carrier plate, and have a hydraulic high-pressure closing unit and a quick-locking mechanism mounted thereon external to the mold carrier plates. Elements are provided which detect the position of the movable mold carrier plate in a defined manner and control the quick-locking mechanism the closing unit, and the driving cylinder.