| 摘要 |
PURPOSE:To prevent position deviations, etc. of the work by coupling a regular hem to one of approachable upper and lower platens, fixing pre- and regular bending blades to the regular hem and disposing the guide and cam for defining the movement of the above-mentioned bending blades as specified. CONSTITUTION:In approachably providing an upper platen (ram) 24 by way of a cylinder 26 to a lower platen 20 fixed with a lower die 23, coupling a regular hem 28 to the ram 24 by way of links 29, 29', integrally fixing a prebending blade 30a and regular blade 30 to the regular hem 28 and bending the assembly of the outer plate 2 and inner plate 3 on the lower die 23, a shifting guide 32 is provided to the lower platen 20 and a shifting cam 31 to the regular hem 28 and are so constituted that by the engagement of the both the prebending blade 30a contacts the work at an angle of 20-70 deg. and the regular bending blade 30 becomes parallel to the die face in the final bent state of the work so that the switching of the force of the regular hem 28 is smoothly accomplished, where by the occurrence of the position deviation and creasing of the outer plate 2 is prevented. |
