Patent ID: 7469605
Filing Date: 2008-12-30
Classification: B29C

Abstract:
1. Device for detecting a force on an injection molding machine for processing plastics materials and other plasticisable compounds, said device comprising: at least one first component, which interacts with at least one mechanical drive, which is displaced at least indirectly by the mechanical drive in a direction of displacement and is displaced during the displacement relatively to at least one additional component of the injection molding machine, the additional component being adjacent the first component, and at least one force detecting device for detecting the force acting on at least one of the first component and the additional component due to an activation of the injection molding machine as a result of the relative displacement between the first component and the additional component, a hydraulic chamber being formed between the first component and the additional component, the size of the hydraulic chamber changing during the relative displacement by means of a change in the pressure of a hydraulic medium situated in the hydraulic chamber, wherein the change in pressure is an input signal for controlling a force or a pressure, wherein a pressure-relief valve is provided for diverting hydraulic medium into a hydraulic medium container when a predetermined or predeterminable pressure is exceeded in a hydraulic chamber, wherein the hydraulic chamber is defined by the first component and the additional component and by a piston-type element, which is mounted on one of the first component and the additional component in a manner sealing the hydraulic chamber and wherein the piston-type element is displaceable in the direction of displacement of the first component if the predetermined or predeterminable pressure of the hydraulic medium is exceeded in the hydraulic chamber.