Patent ID: 11865616
Assignee: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.
Field: Other special machines (Mechanical engineering)
Classification: CPC B | IPC B

Claim 8:
9. A process to decake a group of green parts printed with a powder based 3D printer, the process comprising:
vibrating a platform supporting multiple green parts surrounded by unbound powder;
photographing the green parts on the vibrating platform as the unbound powder is removed from around the green parts;
detecting a pattern of light intensity in the photographs;
determining a detected pattern matches a reference pattern, wherein determining a detected pattern comprises at least one of:
identifying more darker regions and fewer brighter regions in a pattern of a decaked green part compared to a pattern of a caked green part;
identifying less darker regions and more brighter regions in the pattern of the decaked green part compared to the pattern of the caked green part; or
counting an increasing number of holes visible in the photographs; and

based on the determining, modulating or stopping vibrating the platform.