Cassette tape with guiderails on cassette holder apparatus

A tape cassette recording and/or reproducing apparatus capable of selective operation with at least a large-sized cassette or a small-sized cassette having differenet respective widths each measured in a transverse direction, said large-sized cassette having a bottom surface with a plurality of grooves therein spaced apart in the respective transverse direction and each extending at right angles to said transverse direction, said appratus comprising:

• a cassette holder movable between a cassette receiving and discharging position and a cassette loading position;
• two parallel guide rails on said cassette holder, said guide rails being spaced apart laterally for slidable reception in the grooves of said large-sized cassette so as to position the latter in respect to said holder in said loading position of the latter, and so as to guide said large-sized cassette in and out of said holder in said receiving and discharging position;
• and
• confronting surfaces on said two guide rails which are spaced apart by the width of said small-sized cassette so that said confronting surfaces are slidably engageable with opposed side surfaces of said small-sized cassette for positioning the latter in respect to said holder in said loading position and for guiding said small-sized cassette in and out of said holder in said receiving and discharging position.