公开(公告)号：US20240100772A1

公开(公告)日：2024-03-28

申请号：US18371273

申请日：2023-09-21

Applicant: MARKFORGED, INC.

Inventor： Benjamin Fine ,  Nathaniel Berman ,  Angus MacMullen ,  David Piper ,  Nicholas Kalweit ,  Peter Kelly

IPC: B29C64/209 ,  B29C64/118 ,  B33Y30/00

CPC classification number: B29C64/209 ,  B29C64/118 ,  B33Y30/00

Abstract: A three-dimensional printer for the additive manufacturing of a part is provided. The printer includes a build platen, a pre-extrusion system, and a print head located downstream of the pre-extrusion system and configured to receive and deposit a filament. The print head includes a receiving section configured to receive the filament, an outlet through which the filament is deposited onto the build platen or a previously added layer of a part, a feeding mechanism constructed and arranged to feed the filament into the outlet, and a path length adjustment system positioned on the print head disposed between the pre-extrusion system and the feeding mechanism. The path length adjustment system constructed and arranged to create slack in the filament being delivered from the pre-extrusion system. Path length adjustment devices incorporating sliding components and flexure components are also disclosed.