Three-dimensional printer extrusion head capable of feeding in switching mode

Abstract

The invention discloses a three-dimensional printer extrusion head capable of feeding in a switching mode. The three-dimensional printer extrusion head comprises a base, a feeding switching assembly, a printing filament heating fusing channel, a filament driving motor, a driving feeding wheel and a linkage swinging mechanism, wherein the feeding switching assembly is rotatably connected with the base through a first rotating shaft, driven feeding pressing wheels are arranged on two sides of the driving feeding wheel respectively, one end of the printing filament heating fusing channel is connected with printing filaments respectively, the other end of the printing filament heating fusing channel is connected with printing filament extrusion nozzles respectively, the filament driving motor is installed on the base, the driving feeding wheel is directly connected with the filament driving motor, the linkage swinging mechanism has the bistable state characteristic, and positions of the printing filament heating fusing channel and printing filament extrusion nozzles are not changed respectively during the switching printing of two kinds of printing materials. Only one feeding driving motor is used, the alternate switching feeding of two kinds of filaments can be achieved through changing of the rotation direction of the motor and positions of corresponding driven feeding pressing wheels, mechanical positioning errors caused by switching moving of the extrusion head or nozzles are avoided, the feeding friction force of the driving feeding wheel is constant, and the stable feeding during printing can be achieved.

Description

technical field [0001] The invention relates to a three-dimensional printer based on a fusion deposition rapid prototyping process, in particular to a three-dimensional printer extrusion head with switchable feeding. Background technique [0002] The 3D printer based on the fused deposition rapid prototyping process uses plastic filaments with a diameter of about 1-2 mm, and melts and extrudes the plastic filaments into filaments of about 0.2-0.4 mm through a computer-controlled printing extrusion head and scans them layer by layer. Print stacks into three-dimensional objects. Usually, the fused deposition rapid prototyping process needs to add supports when manufacturing objects with cantilever structures. If the extrusion head of the 3D printer only has a single melt channel design structure, the printed object and support can only be constructed with the same material. Although during the printing process, the support part can be loosened by controlling the operation of...

AI Technical Summary

Problems solved by technology

Obviously, the former mechanical switching mechanism is complicated and increases the weight of the extrusion head assembly, which is not conducive to the high-speed printing movement of the extrusion head, and the latter uses two motors, which not only increases the cost but also increases the weight of the extrusion head assembly

Due to the two designs disclosed above, the mechanical position of the nozzle needs to be moved and reset when the flow channel of the extrusion head is switched, and the mechanical positioning error is easily generated during the moving process, which affects the dimensional accuracy of the printed object

The problem that needs to be solved is how to realize the printing switching feeding of the extrusion head of the 3D printer in a simple way without affecting the printing size accuracy of the object due to switching feeding

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