Ribbon guide in a tape cassette

A tape cassette, with a ribbon guide, configured to be removably mounted onto a tape printing apparatus provided with a print head at a cassette mounting portion, wherein the tape cassette comprises:

• a cassette case main body;
• a ribbon feed spool housed in the cassette ease main body;
• an ink ribbon wound around the ribbon feed spool, with an inked surface thereof facing inside;
• a head insertion portion being a space for the print head to be inserted into when the tape cassette is mounted in the cassette mounting portion, the head insertion portion passing through the cassette case main body vertically and extended along one side of the cassette case main body;
• an arm portion including:
• a base end portion positioned in proximity of a feed portion at which the ink ribbon is drawn out from the ribbon feed spool, the base end portion supporting an arm main body projecting at the one side of the cassette case main body;
• and a top end portion provided with a discharge slot which opens toward the head insertion portion, wherein the ink ribbon travels in a predetermined direction which is a direction from the feed portion passing through the discharge slot, toward the head insertion portion;
• a plurality of guide ribs;
• a first guide rib being one of the plurality of guide ribs, provided between the feed portion and the discharge slot, and positioned on the discharge slot, or immediately before the discharge slot, on an upstream side in a travel direction of the ink ribbon, wherein the first guide rib bends and guides travel of the ink ribbon in the predetermined direction while making contact with a reverse side of the inked surface of the ink ribbon, and is evenly-formed along a width direction of the ink ribbon which orthogonally crosses the travel direction of the ink ribbon except for a center portion of the first guide rib;
• a second guide rib being one of the plurality of guide ribs, provided between the feed portion and the discharge slot, and positioned on an upstream side in the travel direction of the ink ribbon with respect to the first guide rib, wherein the second guide rib bends and guides the travel of the ink ribbon in the predetermined direction while making contact with the reverse side of the inked surface of the ink ribbon, and is evenly-formed along the width direction of the ink ribbon which orthogonally crosses the travel direction of the ink ribbon except for a center portion of the second guide rib;
• a third guide rib being one of the plurality of guide ribs, provided between the feed portion and the discharge slot, and positioned on a downstream side in the travel direction of the ink ribbon with respect to the first guide rib, wherein the third guide rib bends and guides the travel of the ink ribbon in the predetermined direction while making contact with the reverse side of the inked surface of the ink ribbon, and is evenly-formed along the width direction of the ink ribbon which orthogonally crosses the travel direction of the ink ribbon;
• a first upstream-side projecting piece portion provided at the center portion of the second guide rib, the first upstream-side projecting piece portion being a stepped portion having a trapezoidal cross section projecting along the width direction of the ink ribbon which orthogonally crosses the travel direction of the ink ribbon;
• and
• a downstream-side projecting piece portion provided at a center portion of the first guide rib, the downstream-side projecting piece portion being a stepped portion having a trapezoidal cross section projecting along the width direction of the ink ribbon which orthogonally crosses the travel direction of the ink ribbon, and lower in height than the first upstream-side projecting piece portion.

A tape cassette, with a ribbon guide, configured to be removably mounted onto a tape printing apparatus provided with a print head at a cassette mounting portion, wherein the tape cassette comprises:

• a cassette case main body;
• a ribbon feed spool housed in the cassette case main body;
• an ink ribbon wound around the ribbon feed spool, with an inked surface thereof facing inside;
• a head insertion portion being a space for the print head to be inserted into when the tape cassette is mounted in the cassette mounting portion, the head insertion portion passing through the cassette case main body vertically and extended along one side of the cassette case main body;
• an arm portion including:
• a base end portion positioned in proximity of a feed portion at which the ink ribbon is drawn out from the ribbon feed spool, the base end portion supporting an arm main body projecting at the one side of the cassette case main body;
• and a top end portion provided with a discharge slot which opens toward the head insertion portion, wherein the ink ribbon travels in a predetermined direction which is a direction from the feed portion, passing through the discharge slot, toward the head insertion portion;
• a plurality of guide ribs;
• a first guide rib being one of the plurality of guide ribs, provided between the feed portion and the discharge slot, and positioned on the discharge slot, or immediately before the discharge slot, on an upstream side in a travel direction of the ink ribbon, wherein the first guide rib bends and guides travel of the ink ribbon in the predetermined direction while making contact with a reverse side of the inked surface of the ink ribbon, and is evenly-formed along a width direction of the ink ribbon which orthogonally crosses the travel direction of the ink ribbon except for a center portion of the first guide rib;
• a second guide rib being one of the plurality of guide ribs, provided between the feed portion and the discharge slot, and positioned on an upstream side in the travel direction of the ink ribbon with respect to the first guide rib, wherein the second guide rib bends and guides the travel of the ink ribbon in the predetermined direction while making contact with the reverse side of the inked surface of the ink ribbon, and is evenly-formed along the width direction of the ink ribbon which orthogonally crosses the travel direction of the ink ribbon;
• a third guide rib being one of the plurality of guide ribs, provided between the feed portion and the discharge slot, and positioned on a downstream side in the travel direction of the ink ribbon with respect to the first guide rib, wherein the third guide rib bends and guides the travel of the ink ribbon in the predetermined direction while making contact with the reverse side of the inked surface of the ink ribbon, and is evenly-formed along the width direction of the ink ribbon which orthogonally crosses the travel direction of the ink ribbon;
• a downstream-side projecting piece portion provided only at the center portion of the first guide rib, the downstream-side projecting piece portion being a stepped portion having a trapezoidal cross section projecting along the width direction of the ink ribbon which orthogonally crosses the travel direction of the ink ribbon.