公开(公告)号：US20240017553A1

公开(公告)日：2024-01-18

申请号：US17867400

申请日：2022-07-18

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

Inventor： Russell Sterling SAUER ,  Jeffrey A. WAGNER

IPC: B41J2/175 ,  B41J2/045

CPC classification number: B41J2/17566 ,  B41J2/04501 ,  B41J2002/17569

Abstract: An example printing device includes a plurality of printing agent reservoirs and a printing assembly that is to emit printing agent onto print media. In addition, the printing device includes a pumping assembly fluidly coupled between the plurality of printing agent reservoirs and the printing assembly. The pumping assembly includes a motor and is to transport the printing agent from the plurality of printing agent reservoirs to the printing assembly. Further, the printing device includes a controller coupled to the motor. The controller is to: receive a work parameter of the motor; receive printing agent usage data; and determine that a first printing agent reservoir of the plurality of printing agent reservoirs is empty based on the work parameter and the printing agent usage data.