The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 09, 2021
Filed:
Jun. 27, 2017
Robert Bosch Tool Corporation, Broadview, IL (US);
Jeremy Rubens, Palatine, IL (US);
Daniel John Blythe, Palatine, IL (US);
Chris R. Dvorak, Chicago, IL (US);
ROBERT BOSCH TOOL CORPORATION, Mount Prospect, IL (US);
ROBERT BOSCH GMBH, Stuttgart, DE;
Abstract
An automatic mechanical spool changer for 3-D printers includes a filament guide and a pre-loading device. The input to the filament guide receives at least a primary filament from a primary spool and a secondary filament from a secondary spool. The output from the filament guide connects to an extruder, and the output from the filament guide sequentially and automatically provides the primary filament and then the secondary filament to the extruder. The pre-loading device exerts a pre-loaded force on the secondary filament during the extrusion of the primary filament. After the primary filament passes a predetermined location within the filament guide, the force exerted on the secondary filament threads the secondary filament through the output of the filament guide and into the extruder.