Switching device for double nozzles of 3D printer

A switching device for double nozzles of a 3D printer, mounted on a case of the 3D printer, and characterized in that:

• the case is provided with two guide slots, and two vertically disposed nozzle devices respectively penetrate into the two guide slots;
• and
• the switching device for double nozzles comprises:
• two transmission blocks, which are in mirror image structures with each other, are respectively mounted on upper ends of the two nozzle devices and are respectively inserted into the two guide slots, wherein each transmission block is provided with a pressure supporting and transmitting portion and a block body;
• each pressure supporting and transmitting portion having a pressing-down stopping portion, a pressure transmitting portion and a restoring stopping portion which are connected in sequence;
• each block body having a vertical center axis with a coaxial hole passing therethrough for feeding a respective nozzle;
• a rotary part, movably connected to the case and provided with two pressing parts;
• and
• two spring parts, respectively sleeving the two nozzle devices (200), wherein each spring part supports a corresponding transmission block, so that the pressure supporting and transmitting portions of the two transmission blocks respectively push against corresponding pressing parts;
• wherein:
• the rotary part is capable of rotating in a reciprocating manner, the rotary part drives the two pressing parts to respectively move on the two pressure supporting and transmitting portions and when each pressing part moves to the pressing-down stopping portion from the restoring stopping portion, each pressing part pushes the pressure transmitting portion to move downward;
• when one pressing part moves to the pressing-down stopping portion of the contacted transmission block, the other pressing part moves to the restoring stopping portion of the contacted transmission block;
• when each pressing part moves on the pressing-down stopping portion or the restoring stopping portion, the pressure supporting and transmitting portion keeps a stopping state;
• the coaxial hole of each block body is always aligned with a central axis of each nozzle;
• and
• there is always an offset between the central axis of each nozzle and each pressure transmitting portion.