Demag - building toggle systems for over 50 years.
Fast, secure clamping, energy-saving and reliable
Toggles are the most commonly built and used clamping system in Europe. Almost two thirds of all injection moulding machines of over 100 tonnes clamp-force used in Europe employ toggles as the clamping system. That the design is not static, but is constantly being developed and optimised, makes it the most reliable and dependable type of clamping system, with distinct technical and economic advantages.
Innovation is not just a matter of developing new systems, but also of developments which have characterised a whole epoch of injection moulding and which have withstood the test of time. This is the toggle clamping unit for injection moulding machines, i.e. the toggle as the closing, clamping, locking and opening system with one fixed and one moving platen, an end or anchor platen as a fixed pivot point for the toggle links, i.e. as an abutment for the mould clamping and locking force, and four tie-bars to contain the force and guide the moving platen.
The designers of the first single-screw injection moulding machines in 1956 at Ankerwerk Goller Bros. in Nuremberg put their trust in this closing principle. This was, of course, a toggle of simple construction and it would be a long development road to the computer-optimised 5-point double toggle system (of which more later) in today’s clamp units with ramped control of the endpoints. On this road the toggle system has undergone an exemplary, detailed development. It continues to be the guarantor of precise and reliable injection moulding, as this article will show.
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