Accommodation cassette

Abstract

An accommodation cassette including: a plurality of rear accommodating grooves that are formed at least in the laterally central area of the inner surface of a rear wall connecting the rear edges of right and left side walls and extend laterally and parallel to each other at vertical spacings in such a manner as to be associated with right and left accommodating grooves.

What is claimed is: 
     
         1 . An accommodation cassette comprising:
 a right side wall;   a left side wall provided parallel to the right side wall;   a rear wall adapted to connect the rear edges of the right and left side walls;   a plurality of right accommodating grooves that are formed on the inner surface of the right side wall and extend longitudinally and parallel to each other at vertical spacings;   a plurality of left accommodating grooves that are formed on the inner surface of the left side wall and extend longitudinally and parallel to each other at the vertical spacings in such a manner as to be associated with the right accommodating grooves; and   a plurality of rear accommodating grooves that are formed at least in the laterally central area of the inner surface of the rear wall and extend laterally and parallel to each other at the vertical spacings in such a manner as to be associated with the right and left accommodating grooves.   
     
     
         2 . The accommodation cassette of  claim 1 , wherein
 a plurality of protruding pieces are formed in the laterally central area of the inner surface of the rear wall and extend laterally and parallel to each other at vertical spacings, and wherein   the rear accommodating grooves are defined by the protruding pieces.