The kinematic synthesis of the unknown parameters of the rectilinearly - enveloped mechanism of jaw crusher presented, which is linked dependencies with known parameters of the crushing chamber, unloading and loading slot. The dependence obtained on the basis of the method of interpolation approximation of functions. The description jaw crusher with complex movement of an agency on a basis rectilinearly - bent around the mechanism is submitted, her dignity and the area of application

Keywords: rectilinearly - enveloped mechanism, kinematic synthesis, and jaw crusher.