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US 2018/0009167 A1Published application
Print head drop detectors
AssigneeHewlett-Packard Development Company, L.P.
InventorsIgnacio Alejandre, Sergi Culubret, Esteve Comas
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Abstract
In one example, a print head drop detector (202) is described. The print head drop detector (202) comprises a sampling volume and a fan (208) to cause an airflow though the sampling volume (206). Detection apparatus to detect the presence of non-gaseous material within the sampling volume is also provided.
Claims15
A print head drop detector comprising
- a sampling volume;
- a fan to cause an airflow though the sampling volume;
- and
- detection apparatus to detect the presence of non-gaseous material within the sampling volume.
1 more element
Three-dimensional object generation apparatus comprising:
- a fabrication chamber in which an object is generated;
- an agent distributor to selectively deliver an agent onto portions of a layer of build material within the fabrication chamber;
- and
- a detector to monitor the ejection of agent from the agent distributor and to monitor the gaseous content of the fabrication chamber for particles dispersed therein.
1 more element
A method of determining a risk of ignition of airborne particles within three-dimensional object generation apparatus, the method comprising:
- i. sampling the gaseous content of a fabrication chamber of the apparatus and determining a concentration of suspended particles therein;
- ii. determining a risk of ignition from the concentration of suspended particles;
- iii. determining if the risk of ignition exceeds a threshold risk level.
Dependencies are inferred from the claim text.