Printer

A printer comprising:

• a first cam that is configured to change a distance between a pair of rollers that are provided opposite to each other with a paper therebetween, wherein at least one of the pair of rollers is configured to feed the paper along a transfer path by its rotation,
• a second cam that is configured to change a distance between a printing head portion for printing on the paper and a platen roller that is provided opposite to the printing head portion with the paper therebetween, and
• a third cam that is configured to switch the transfer path for the paper to one of a first transfer path and a second transfer path that are formed as different transfer paths,
• wherein the first cam, the second cam, and the third cam are connected to a same rotation axis,
• wherein the first transfer path is a transfer path continuous to an ejection port for ejecting the paper outside, and the second transfer path is a decurl transfer path for decurling to reduce a curl of the paper,
• wherein the first cam is further configured to switch the printer between a feedable state where the pair of rollers contact each other and an unfeedable state where the pair of rollers are separated from each other,
• wherein the second cam is further configured to switch the printer between a printable state where the printing head portion and the platen roller contact each other and an unprintable state where the printing head portion and the platen roller are separated from each other,
• the printer further comprising:
• a printing process for feeding the paper and printing on the paper,
• a feeding process for feeding the paper without printing on the paper,
• a decurling process for feeding the paper to the second transfer path, and
• a waiting process before printing on the paper not to feed the paper,
• wherein the first cam, the second cam, and the third cam are provided in accordance with a rotational angle of the rotation axis such that
• in the printing process, the first cam switches the printer to the feedable state, the second cam switches the printer to the printable state, and the third cam switches the transfer path to the first transfer path,
• in the feeding process, the first cam switches the printer to the feedable state, the second cam switches the printer to the unprintable state, and the third cam switches the transfer path to the first transfer path,
• in the decurling process, the first cam switches the printer to the feedable state, the second cam switches the printer to the unprintable state, and the third cam switches the transfer path to the second transfer path, and
• in the waiting process, the first cam switches the printer to the unfeedable state, the second cam switches the printer to the unprintable state, and the third cam switches the transfer path to the first transfer path or the second transfer path.