An image forming device includes: a tray; an image forming unit; a drive source; a feeding roller; a support portion; a support shaft; and a drive shaft. The tray is configured to support a recording sheet. The image forming unit is configured to form an image on the recording sheet. The drive source is configured to generate a driving force. The feeding roller is configured to rotate upon receipt of the driving force to feed the recording sheet supported by the tray toward the image forming unit. The support portion is configured to rotatably support the feeding roller. The support shaft is disposed above the tray and configured to pivotally movably support the support portion. The drive shaft is independent of the support shaft and configured to rotate upon receipt of the driving force from the drive source.

The disclosure discloses a printer including a load circuit, a controller, a power receiving terminal, a first switching circuit, and a second switching circuit. The controller is configured to control voltage supply to the load circuit, and is connected to an input part. The power receiving terminal is configured to be connected to a power feeding terminal of an external power source device. The first switching circuit includes a first switch element configured to switch between conduction and interruption in accordance with a first control signal input from the controller, and is connected between the power receiving terminal and the input part. The second switching circuit includes a second switch element configured to switch between conduction and interruption in accordance with a second control signal input from the controller, and is connected between the battery storage part and the input part.

A needed job is quickly performed even if a recovery operation for a print head performed by a recovery mechanism needs a long time as a result of sharing of the same drive source between a discharge roller and the recovery mechanism. To achieve this, a recovery operation for the print head is suspended when a print job is received while the recovery operation is being performed, on a condition that a printing apparatus is in a state where the printing apparatus permits the print job to be performed.

A printing mechanism having an engaging body that is rotatable between an engaging position, in which it retains a printing roller in a position facing a thermal printing head, and a disengaging position wherein it enables the printing roller to be removed; a reversible drive shaft rotating in one direction rotates the printing roller and rotating in the opposite direction moves the engaging body to the disengaging position, owing to a unidirectional joint that connects the drive shaft to the engaging body only when the drive shaft rotates in an opposite direction.

A print system includes a head, a conveyance motor, a first connector, and a second connector, a power supply circuit. When a first power source is connected to the first connector and a second power source is connected to the second connector, the power supply circuit supplies at least some of a first power to the head and supplies at least some of a second power to the conveyance motor. The first power is a power of the first power source. The second power is a power of the second power source.

A print system includes a head, a conveyance motor, a first connector, and a second connector, a power supply circuit. When a first power source is connected to the first connector and a second power source is connected to the second connector, the power supply circuit supplies at least some of a first power to the head and supplies at least some of a second power to the conveyance motor. The first power is a power of the first power source. The second power is a power of the second power source.

A maintenance device includes a cap, a cap moving portion, a suction portion, a switching portion, and a drive transmission unit, wherein the drive transmission unit includes a drive source, a first transmission mechanism, and a second transmission mechanism, the first transmission mechanism includes a first drive delay unit that does not transmit driving of the drive source even when the drive source drives by a certain amount when the drive source performs switching of the switching portion via the second transmission mechanism, and the second transmission mechanism includes a second drive delay unit that does not transmit driving of the drive source even when the drive source drives by a certain amount when the drive source performs moving of the cap via the first transmission mechanism.