disclosed is a mold - closing device for an injection molding machine used for processing plastic materials , in which the mold supports accommodating an injection mold therebetween and a support element for a mold - closing mechanism are mounted on the machine base . in order to be able to precisely align the mold supports , the first mold support is also mounted on the machine base so as to be movable in the closing direction , the support element is mounted on the machine base or a part thereof via a stationary bearing , and a positioning mechanism is provided for adjusting the angle between the support element and the machine base .