A system of injection-machine closing units comprising first and second closing units, wherein each of the first and second closing units is constructed as a toggle lever closing unit, wherein each of the first and second closing units comprises:
- a fixed platen;
- a movable platen;
- a support plate;
- a crosshead movable by means of a drive along an axis of symmetry of the first or second closing unit;
- and
- at least one toggle lever mechanism able to be actuated by means of the corresponding crosshead, arranged between the corresponding support plate and the corresponding movable platen and articulatedly connected with the corresponding support plate and the corresponding movable platen, said at least one toggle lever mechanism comprising:
- a first lever having first and second ends, the first end of the first lever being articulatedly connected to the corresponding support plate at a first articulation point;
- a second lever having first and second ends, the first end of the second lever being articulatedly connected to the corresponding movable platen at a second articulation point, and the second end of the second lever being articulatedly connected to the second end of the first lever at a third articulation point;
- and
- a third lever having first and second ends, the first end of the third lever being articulatedly connected to the first lever at a fourth articulation point, said fourth articulation point being located between the first and second ends of the first lever, and the second end of the third lever being articulatedly connected to the corresponding crosshead at a fifth articulation point,
- wherein each of the first and second closing units is constructed according to a first closing force F1, wherein one of the first and second closing units is configured such that its movable platen is of a first size and constitutes a closing unit of a first kind, wherein the other of the first and second closing units is configured such that its movable platen is of a second size and constitutes a closing unit of a second kind, wherein the movable platen of the closing unit of the second kind is larger than the movable platen of the closing unit of the first kind with respect to a tool clamping area,
- wherein the first, second, and third levers of the toggle lever mechanism of the closing unit of the first kind are identical to the first, second, and third levers of the toggle lever mechanism of the closing unit of the second kind such that respective distances between:
- the first articulation point and the third articulation point of the toggle lever mechanism of the closing unit of the first kind and the first articulation point and the third articulation point of the toggle lever mechanism of the closing unit of the second kind are the same,
- the second articulation point and the third articulation point of the toggle lever mechanism of the closing unit of the first kind and the second articulation point and the third articulation point of the toggle lever mechanism of the closing unit of the second kind are the same, and
- the fourth articulation point and the fifth articulation point of the toggle lever mechanism of the closing unit of the first kind and the fourth articulation point and the fifth articulation point of the toggle lever mechanism of the closing unit of the second kind are the same, and
- said respective first, second, and third levers of the toggle lever mechanism of the closing unit of the first and second kinds corresponding to one another with respect to their spatial arrangement in the respective closing unit, wherein the first, second, and third levers of the toggle lever mechanism of the closing unit of the second kind are articulated at a greater distance to the axis of symmetry at the corresponding support plate and the corresponding movable platen than the first, second, and third levers of the toggle lever mechanism of the closing unit of the first kind, and wherein the crosshead of the closing unit of the second kind has a greater length in a direction perpendicular to the axis of symmetry than a corresponding length of the crosshead of the closing unit of the first kind, such that the toggle lever mechanisms of the first and second closing units have the same kinematics.