公开(公告)号：US20210010849A1

公开(公告)日：2021-01-14

申请号：US16505490

申请日：2019-07-08

Applicant: Hewlett-Packard Development Company, L.P.

Inventor： Alexander David LAWS ,  Bradley Alan BENSON ,  Joshua Ryan SCHMALE ,  Leon Johannes Arnoldus BRUNKEN ,  Justin Michael ROMAN ,  Lukas Peter SOSNOWSKI

IPC: G01G5/00 ,  B29C64/255 ,  B33Y30/00 ,  G01G17/04

Abstract: An example of an apparatus is provided. The apparatus includes a container to store a powder. The apparatus includes a flow generator to move a gas to the container. The flow generator is to move the gas at a first velocity and a second velocity, the first velocity to fluidize the powder in a fluidized state, and the second velocity to pass through stationary powder in a powder pack. The apparatus includes pressure sensors to measure pressures in the container. The apparatus includes a measurement engine in communication with the pressure sensors, wherein the measurement engine is to calculate a mass of the powder based on a fluidized pressure differential and based on a pack pressure differential.

公开(公告)号：US20210206091A1

公开(公告)日：2021-07-08

申请号：US16075493

申请日：2017-06-27

Applicant: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.

Inventor： Samantha KANG ,  Alexander David LAWS

IPC: B29C64/35 ,  B29C64/314 ,  B29C64/357 ,  B29C64/165 ,  B33Y30/00 ,  B33Y40/10 ,  B33Y50/00 ,  B29C64/386

Abstract: In some examples, an apparatus includes an optical sensor to detect a material in a printing system, a light transmissive layer to pass light to the optical sensor, and a wiper actuatable to wipe a surface of the light transmissive layer to remove particles of the material away from the surface of the light transmissive layer.

公开(公告)号：US20210094233A1

公开(公告)日：2021-04-01

申请号：US17050781

申请日：2018-09-28

Applicant: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.

Inventor： Randall WEST ,  Justin M. ROMAN ,  Alexander David LAWS ,  Jeffrey BERGESON ,  Kevin HULICK

IPC: B29C64/329 ,  B33Y40/00 ,  B01F13/02

Abstract: A 3D printing system comprises a pressure system to provide a negative pressure and a hopper having a first opening to receive powder to be used for printing, wherein the powder is received in an open state of the first opening. The hopper has a second opening to guide air from outside the hopper to inside the hopper and has a third opening connected to the pressure system so as to provide for a negative pressure inside the hopper, the negative pressure to overcompensate for the air receive through the second opening such that a pressure being lower when compared to an ambient pressure of the hopper is generated inside the hopper.

公开(公告)号：US20210221062A1

公开(公告)日：2021-07-22

申请号：US16075494

申请日：2017-06-27

Applicant: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.

Inventor： Alexander David LAWS ,  Samantha KANG ,  Jay OSBORNE

IPC: B29C64/35 ,  B29C64/25

Abstract: Printers and associated printer maintenance methods and apparatus are disclosed. An example printer includes a build material dispenser to dispense build material onto a work area; a contaminant filter to receive at least some of the build material from the work area, the contaminant filter being structured to filter contaminants from the build material received; and a drawer including the contaminant filter, the drawer to enable the contaminant filter to be removed for cleaning.

公开(公告)号：US20210206098A1

公开(公告)日：2021-07-08

申请号：US16075484

申请日：2017-07-20

Applicant: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.

Inventor： Randall WEST ,  Alexander David LAWS ,  Robert Lawrence WINBURNE ,  Samantha KANG

IPC: B29C64/357 ,  B29C64/314 ,  B29C64/35 ,  B33Y10/00 ,  B33Y30/00 ,  B33Y40/10

Abstract: In some examples, a build material recycling device of a three-dimensional (3D) printer can include an upper chamber including an inlet and a material separator coupled to the inlet, a classifier coupled to the upper chamber, and a lower chamber coupled to the classifier, where the classifier is located between the upper chamber and the lower chamber.

公开(公告)号：US20210197469A1

公开(公告)日：2021-07-01

申请号：US16076359

申请日：2017-07-27

Applicant: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.

Inventor： Alexander David LAWS ,  Peter BOUCHER ,  Devin KOEPL ,  Samantha KANG ,  Charles Hugh OPPENHEIMER ,  Justin M ROMAN

IPC: B29C64/314 ,  B29C64/393 ,  B29C64/357 ,  B33Y10/00 ,  B33Y30/00 ,  B33Y40/00 ,  B33Y50/02

Abstract: According to one aspect there is provided a build material processing apparatus for a 3D printing system. The system comprises a sieve to sieve build material, the sieve to receive a flow of build material, a vibrator mechanism to vibrate the sieve at a resonant frequency. A controller is provided to determine displacement characteristics of the sieve, determine, based on the displacement characteristics, a fill state of the sieve, and control a flow of build material to the sieve based on the determined fill state.