Tape-shaped label printing device

A tape cassette mounting system, comprising:

• a printing head support supporting a thermal printing head, the printing head support including first and second coupling ridges;
• a cassette casing having a head recess formed therein for accommodating the printing head support, the cassette casing including first and second slots formed in at least one wall defining the head recess, the first and second slots receiving the first and second coupling ridges of the printing head support.

A tape cassette for use in a printing device having a tape cassette mounting area including a base surface, a printing head support extending upwardly from the base surface, the printing head support comprising a first surface supporting a thermal printing head, a second surface opposite to the first surface, and a laterally extending coupling ridge on the second surface, the tape cassette comprising:

• a cassette casing comprising upper and lower surfaces and a lateral surface extending between the upper and lower surfaces;
• a head recess formed in the cassette casing and interacting with the coupling ridge of the printing head support to locate the tape cassette in a predetermined orientation relative to the printing head support when the tape cassette is mounted in the mounting area.