Printer having replaceable print head

A printer having a replaceable print head, comprising a printer body (11) and a print head housing (12), the printer body (11) being provided with a flicking needle base (15) and a locking base (16), wherein a flicking needle (14) matched with the flicking needle base (15) is disposed at a bottom end of the print head housing (12);

• the locking base (16) is internally provided with a fixation component for fixing the print head housing (12);
• the print head housing (12) is internally provided with a thermal print head (13);
• a first connector (24) is disposed on one side of the printer body (11) and is internally and electrically connected with a second connector (25);
• the second connector (25) is fixedly disposed on one side of a mounting box (23) that is internally provided with a reel (26) internally sleeved with a reel roller (27);
• a guide component for guiding a printing material is disposed at an upper end of the printer body (11);
• several sliding chutes are disposed on the reel roller (27) in an equal interval and are each internally provided with a locking slide block (31) slidably;
• the reel roller (27) is internally provided with a thrust gear for pushing the several locking slide blocks (31) to move;
• a calender roller (51) is clung to one side of the reel (26) and is rotatably disposed in an inner side of a rotating frame;
• one side of the rotating frame is fixedly connected to output ends of several spring extension rods (52), respectively;
• the spring extension rods (52) are disposed into a mounting hole on one side of the mounting box (23);
• and the mounting box (23) is internally provided with a driving gear for driving the reel (26) to discharge evenly.