Patent ID: 8291737

Claim:
An automatic extrusion device, comprising: a main body having an accommodating room therein; a driving unit disposed in the accommodating room for supplying power; a first transmission unit disposed in the accommodating room and connected with the driving unit for receiving the power from the driving unit; a second transmission unit disposed in the accommodating room, the second transmission unit comprising an inner threaded pipe, an outer threaded pipe, an action sleeve and a driving member, the inner threaded pipe being fixed in the accommodating room, one end of the outer threaded pipe having an engaging portion, the engaging portion being screwed in the inner threaded pipe, another end of the outer threaded pipe extending out the inner threaded pipe and being formed with a stop portion, one end of the action sleeve having a connection portion to connect with the first transmission unit, another end of the action sleeve being formed with a head, the driving member being disposed between the stop portion of the outer threaded pipe and the head of the action sleeve, the action sleeve transmitting the power to the outer threaded pipe for driving the outer threaded pipe to turn in the inner threaded pipe, one end of the driving member having a slip inclined surface, another end of the driving member having a press portion, the press portion being adapted to press an elastic member which is axially provided, the slip inclined surface of the driving member providing a slip effect when the outer threaded pipe stops running; and an extrusion unit having a center shaft, one end of the center shaft having a fixing portion, the fixing portion being inserted through the inner threaded pipe and the outer threaded pipe and connected to the action sleeve, another end of the center shaft having a coupling portion, a front end of the coupling portion being connected with a mandrel assembly.