Pressing and releasing mechanism for printing rubber roller

The utility model discloses a printing rubber roller pressing and releasing mechanism which specifically comprises a machine core support, a rotary knob is installed on one side of the upper surface of the machine core support in a rotating mode, a face A and a face B are arranged on the rotary knob, a guide roller swing arm is installed on the machine core support and located on one side of the rotary knob in a rotating mode, and a printing rubber roller swing arm is installed on the back face of the machine core support in a rotating mode. A printing head assembly is installed on the machine core support, a printing rubber roller shifting piece is installed on the back face of the machine core support, a rubber roller pressing tension spring is movably connected to the printing rubber roller shifting piece, and the rubber roller pressing tension spring is located on the back face of the machine core support and connected with the end of the printing rubber roller swing arm. Through cooperative use of the ro