Patent ID: 8029200

Claim:
A printing apparatus connected to a computer and for printing on a substrate by actuating a print head based on print data sent from the computer, comprising: a detection signal receiving device that receives a detection signal for detecting the printing apparatus transmitted from the computer; a printable condition determining device that, when the detection signal is received by the detection signal receiving device, determines whether or not a predetermined printable condition is satisfied; a power-ON device that, when it is determined that the printable condition is satisfied by the printable condition determining device, turns ON the main power supply of the printing apparatus; and a control device that executes print preparation processing after the main power supply is turned ON by the power-ON device; wherein when the power-ON device turns ON the main power supply of the printing apparatus, the printing apparatus is in sleep mode or energy saving mode in which electric power is supplied only to the control device and the detection signal receiving device; and wherein the printing apparatus includes a power supply equipped with a battery, and when the power supply is started, first, the printing apparatus turns into sleep mode or energy saving mode in which electric power is supplied only to the control device and the detection signal receiving device.