A printing apparatus includes a platen roller that transports a medium, a print head that is disposed to face the platen roller and prints on the medium, a cutter that cuts off, from the medium, a printed portion on which printing has been performed by the print head, a drive that drives the platen roller, and a processor that controls the drive. After the printed portion is cut off by the cutter, the processor controls the drive such that the platen roller transports the medium in an ejection direction and holds the medium still. After an instruction to start next printing by the print head is received, the processor controls the drive such that the platen roller transports the medium in a reverse direction opposite to the ejection direction.

A cassette is detachably attachable to a printing device in a first direction, the printing device including a print head, a platen roller, a motor for generating a driving force to rotate the platen roller, and a power transmission portion for transmitting the driving force to the platen roller. The cassette includes a printing tape, a casing accommodating the printing tape, and a pressure portion. Upon attachment of the cassette to a cassette receiving portion of the printing device, the pressure portion is configured to move a specific gear of the power transmission portion in the first direction to allow the power transmission portion to mechanically switch a ratio of a rotation number of the platen roller to a rotation number of the motor in accordance with a position of the specific gear in the first direction.

A printing apparatus including: a first roller mechanism including: a first shaft part having a first gear; and a first roller in which the first shaft part is inserted; and a second roller mechanism including: a movable holder configured to be moved in directions coming close to and being separated from a printing medium by a displacement mechanism; a second shaft part which is rotatably supported on the movable holder and having a second gear; a second roller in which the second shaft part is inserted, tiltable with respect to a shaft center of the second shaft part, and having an engaging groove recessed in an inner peripheral surface of an intermediate part of the second roller in a shaft center direction; and a protrusion protruding from an outer peripheral surface of the second shaft part and engaged with the engaging groove of the second roller.

A printing apparatus including: a first roller mechanism including: a first shaft part having a first gear; and a first roller in which the first shaft part is inserted; and a second roller mechanism including: a movable holder configured to be moved in directions coming close to and being separated from a printing medium by a displacement mechanism; a second shaft part which is rotatably supported on the movable holder and having a second gear; a second roller in which the second shaft part is inserted, tiltable with respect to a shaft center of the second shaft part, and having an engaging groove recessed in an inner peripheral surface of an intermediate part of the second roller in a shaft center direction; and a protrusion protruding from an outer peripheral surface of the second shaft part and engaged with the engaging groove of the second roller.

A printing device includes: a print head; a platen roller positioned to face the print head; a motor configured to generate a driving force to rotate the platen roller; a cassette receiving portion; and a power transmission portion configured to transmit the driving force of the motor to the platen roller. A cassette incorporating a printing tape to be printed by the print head is detachably attachable to the cassette receiving portion in a first direction. The power transmission portion includes a plurality of gears including a first gear movable from a first position to a second position downstream of the first position in the first direction. The power transmission portion is configured to switch a ratio of a rotation number of the platen roller to a rotation number of the motor depending on whether the first gear is at the first position or at the second position to transmit the driving force to the platen roller.

A printing device includes: a print head; a platen roller positioned to face the print head; a motor configured to generate a driving force to rotate the platen roller; a cassette receiving portion; and a power transmission portion configured to transmit the driving force of the motor to the platen roller. A cassette incorporating a printing tape to be printed by the print head is detachably attachable to the cassette receiving portion in a first direction. The power transmission portion includes a plurality of gears including a first gear movable from a first position to a second position downstream of the first position in the first direction. The power transmission portion is configured to switch a ratio of a rotation number of the platen roller to a rotation number of the motor depending on whether the first gear is at the first position or at the second position to transmit the driving force to the platen roller.

A toothed roller includes: a wheel having teeth on a peripheral surface; and holders that hold n wheels, which satisfy condition 1 and condition 2 described below, such that the n wheels are stacked in an axial direction, n being a natural number of 2 or more. Condition 1 is Pr=Pt/n, where Pr is a tooth pitch of the toothed roller and Pt is a tooth pitch of the wheel. Condition 2 is such that a minimum value of sums of angles each formed by a reference tooth and another reference tooth adjacent thereto in a circumferential direction of one to n wheels is greater than 180 degrees, where one of the teeth is a reference tooth, one of the n wheels is a reference wheel, and wheels having reference teeth near to the reference tooth of the reference wheel are second to nth wheels sequentially.

A toothed roller includes: a wheel having teeth on a peripheral surface; and holders that hold n wheels, which satisfy condition 1 and condition 2 described below, such that the n wheels are stacked in an axial direction, n being a natural number of 2 or more. Condition 1 is Pr=Pt/n, where Pr is a tooth pitch of the toothed roller and Pt is a tooth pitch of the wheel. Condition 2 is such that a minimum value of sums of angles each formed by a reference tooth and another reference tooth adjacent thereto in a circumferential direction of one to n wheels is greater than 180 degrees, where one of the teeth is a reference tooth, one of the n wheels is a reference wheel, and wheels having reference teeth near to the reference tooth of the reference wheel are second to nth wheels sequentially.

A printer configured to cut recording paper with a fixed blade and a movable blade has a blade unit including the movable blade and a slider to which the movable blade is attachable, and the slider includes: a contact part configured to contact the movable blade; a flexible part formed thinner than the contact part; and a first protrusion provided on the flexible part and configured to engage with a first opening provided in the movable blade.

A printing apparatus including: a first roller mechanism including: a first shaft part having a first gear; and a first roller in which the first shaft part is inserted; and a second roller mechanism including: a movable holder configured to be moved in directions coming close to and being separated from a printing medium by a displacement mechanism; a second shaft part which is rotatably supported on the movable holder and having a second gear; a second roller in which the second shaft part is inserted, tiltable with respect to a shaft center of the second shaft part, and having an engaging groove recessed in an inner peripheral surface of an intermediate part of the second roller in a shaft center direction; and a protrusion protruding from an outer peripheral surface of the second shaft part and engaged with the engaging groove of the second roller.