Abstract

According to the present invention, crease lines for precisely folding a cardboard sheet are formed. One end of a belt-shaped metal member (11) is used as a creasing part (12), and the creasing part (12) is provided with an odd number of ridges (13a, 13b) extending in the length direction of the belt-shaped member (11) such that one ridge (13a) is provided at the center of the creasing part (12) in the width direction. Intersecting grooves (16) that are inclined with respect to the center ridge (13a) are formed on both sides of the center ridge (13a), which is provided at the center of the creasing part (12) in the width direction, at intervals in the length direction of the creasing part (12). The ridges (13b) provided on both sides of the center ridge (13a) are each segmented in the length direction to form segmented ridges (13c), forming a straight groove (20), discontinuous grooves (21), segmented ribs (22), and intersecting ribs (23) in the groove bottom of a crease line (L) that is formed by pressing the creasing part (12) into a cardboard sheet (A).

IPC Classes  ?

• B31B 1/25 - Surface scoring

Abstract

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.

IPC Classes  ?

• B31B 1/25 - Surface scoring
• B31F 1/10 - Creasing by rotary tools

Abstract

Protruding lines (14) in an odd number of at least three that extend in the longitudinal direction of a band-shaped member (11) are provided on the creasing section (12) of a crease pressing member (10) and in the center of the width of the creasing section (12), one of the protruding lines (14) divides the remaining even number of lines equally and disposes same respectively on the two sides. Of the various protruding lines (14), at least the apex of the center protruding line (14) disposed at the center of the creasing section (12) in the width direction is formed in a beveled shape and between the various protruding lines (14), a groove (15) is provided. When the creasing section (12) is faced downwards in a ruled lining orientation, the apices of the odd number of protruding lines (14) are disposed as a mountain-shaped protruding form overall with the apex of the protruding line (14) located at the center being lowest, and on both sides of the protrusion formed by the center protruding line (14), recesses formed by grooves (15) and protrusions formed by the protruding lines (14) are formed in continuous succession.

IPC Classes  ?

• B31B 1/25 - Surface scoring
• B31F 1/10 - Creasing by rotary tools