US 11,726,725 B2
Printing device and power control method
Akio Takamoto, Shiojiri (JP)
Assigned to Seiko Epson Corporation, Tokyo (JP)
Filed by SEIKO EPSON CORPORATION, Tokyo (JP)
Filed on Oct. 27, 2020, as Appl. No. 17/81,461.
Claims priority of application No. 2019-195078 (JP), filed on Oct. 28, 2019.
Prior Publication US 2021/0124534 A1, Apr. 29, 2021
Int. Cl. G06F 3/12 (2006.01); H04N 1/00 (2006.01)
CPC G06F 3/122 (2013.01) [G06F 3/1224 (2013.01); G06F 3/1229 (2013.01); H04N 1/00904 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A printing device that is communicable with an external device via a cable and performs printing by using first power supplied from an external power supply, the printing device comprising:
a power supply switch via which the first power is supplied;
a first hardware function section including a printing mechanism that performs the printing;
a connector that is coupled to the cable and is used for both communication with the external device and supply of second power from the external device; and
a second hardware function section including a communication control section that controls communication with the external device via the cable, wherein
when the external power supply is connected and the power supply switch is in an off state, the first power is not provided at all from the external power supply,
when the external power supply is connected and the power supply switch is in an on state, the first power is provided from the external power supply,
when the external power supply is not connected, the external device is connected via the cable, and the power supply switch is in the off state, the second hardware function section operates by using the second power,
when the external power supply is not connected, the external device is connected via the cable, and the power supply switch is in the on state, the second hardware function section operates by using the second power, and
when both the external power supply and the external device are connected and the power supply switch is in the off state, the first hardware function section does not operate by using the first power, but the second hardware function section operates by using only the second power.