Printing device having restricting part on cover for restricting displacement of mounted tape cassette due to thrust load, and tape cassette therefor

A tape cassette mountable in a mounting compartment of a printing device in a mounting direction, the printing device including:

• a housing;
• the mounting compartment provided in the housing and having a recessed shape to provide an opening, the mounting compartment comprising a first support part and a second support part;
• a printing unit provided in the housing;
• and a cover attachable to and detachable from the housing to provide a closed state where the cover closes the opening of the mounting compartment and an open state where the cover exposes the opening of the mounting compartment, wherein the printing unit includes:
• a print head;
• a platen roller configured to oppose the print head;
• and a platen gear connected to the platen roller,
• the tape cassette comprising:
• a tape roll which is a roll of a printing tape subject to printing by the printing unit of the printing device;
• a case accommodating the tape roll, the case having one end portion and an other end portion opposite each other in the mounting direction, the one end portion being configured to face a bottom surface of the mounting compartment while the tape cassette is mounted in the mounting compartment, the case including:
• a first receiving part provided at the one end portion, the first receiving part being configured to be supported by the first support part through contact therewith while the tape cassette is mounted in the mounting compartment;
• a second receiving part provided at the one end portion, the second receiving part being configured to be supported by the second support part through contact therewith while the tape cassette is mounted in the mounting compartment;
• and
• a contact part provided at the other end portion, the contact part being configured to contact a restriction part of the cover while the tape cassette is mounted in the mounting compartment and the cover is in the closed state;
• and
• an output gear rotatably supported by the case and rotatable about an output-gear axis parallel to the mounting direction,
• wherein the output gear is configured to mesh with the platen gear at a mesh point to transmit a driving force from an outside of the tape cassette to the platen gear while the tape cassette is mounted in the mounting compartment,
• wherein the output gear and the platen gear are helical gears configured such that a thrust load is applied to the output gear at the mesh point while the output gear and the platen gear meshing each other are rotating,
• wherein, while the tape cassette is mounted in the mounting compartment, the contact part is positioned in a region that is on an opposite side of an axis from the mesh point when viewed in the mounting direction, the axis passing through the first receiving part and the second receiving part, and
• wherein, while the tape cassette is mounted in the mounting compartment, the contact part is configured to contact the restriction part of the cover in the closed state to restrict the tape cassette from rotating about the axis by the thrust load applied on the output gear.