Printer to control power supply via a host

Abstract

A printer is connected to a host via an interface having a data wire and a power supply wire. The printer includes a power supply portion to convert an external power to a driving power and to supply the driving power to the respective electronic components of the printer, a switch portion to determine whether to supply the driving power to the respective electronic components, and a controller capable of operating from the voltage applied through the power supply wire, to control the switch portion according to a transmission of printing data through the data wire. The controller controls the switch portion to stop a supply of the driving power to the respective electronic components when the printing data is not transmitted for a predetermined time, and when the voltage is not applied through the power supply wire of the interface. Accordingly, unnecessary power consumption is reduced and convenience is improved.

Dependencies are inferred from the claim text.