| 摘要 |
Protruding lines (14) in an odd number of at least three that extend in the longitudinal direction of a band-shaped base plate (11) are provided on the ruled lining section (12) of a ruled line pressing member (10) so that one of the protruding lines (14) is positioned at a position of left-right symmetry at the center of the width of the ruled lining section (12). Each protruding line (14) forms a V-shaped cross-section, the apex (14a) of which is rounded and the two side surfaces (14b) of which form slanting surfaces that slant in opposite directions. V-shaped grooves (15) are provided between adjacent protruding lines (14). When the ruled lining section (12) of the band-shaped base plate (11) is faced downwards, the apices of the odd number of protruding lines (14) are disposed in an overall mountain shape so that the apex of the protruding line (14) located at the center is lowest and the apices become higher as the protruding lines approach the protruding lines (14) at the two sides. Ruled lines with left-right symmetry that are smooth, wave-like depressions and protrusions that do not have corners in the bottoms of the grooves and have an overall mountain shape that is reversed from the mountain shape described above are formed. |
