Tape cassette and automatic attaching apparatus for heat-fusible tape pieces

In an automatic heat-fusible tape pieces attaching apparatus, a plurality of tape cassettes, each including a reel support part rotatably supporting a tape reel and a tape guide part defining a tape guide path extending from the reel support part in a direction of drawing a thermoplactic tape, the tape guide part having pressure rollers sectioning a part of the tape guide path, and a window through which part of the pressure rollers is exposed to the outside from the tape guide part, are detachably supported at predetermined distances on a tape cassette support base situated alongside of a traveling path of the strip and movable along the traveling path for positioning. The support base is moved to position and hold a desired cassette in an extension line of the attaching portion, and the tape is cut off as the tape piece is left on the attaching portion, whereupon the tape is attached to the front surface of the strip by a thermoplastic tape piece fusing means.