Test article pressing mechanism of printing ink decoloration testing machine

The utility model discloses a test article hold-down mechanism of a printing ink decoloration testing machine, which is applied to the technical field of hold-down mechanisms, and has a synchronous pressing function by arranging a first servo motor to drive a driven wheel and a screw rod to rotate through a driving wheel and a chain, and the test article hold-down mechanism can be used for holding down a test article in a linkage rotation mode. A movable plate and a lower extrusion assembly can be effectively pushed to press downwards at the same time, the automation degree of the pressing mechanism is improved, the problems that a plurality of screws are manually rotated to enable a lead screw to rotate, and operation is tedious, time-consuming and labor-consuming are solved, and the practicability of the pressing mechanism is greatly improved; an inserting rod is pushed to slide in a sleeve in the downward pressing process of a moving plate, meanwhile, an arc-shaped extrusion block is matched with an anti-s