| 摘要 |
A device for prehemming at least a portion of an upstanding flange (16,18) of a sheet metal panel (20) which has a tapered roller (32) which is moved into engagement with the flange while moving the roller along the flange with its axis of rotation disposed in a path which is substantially parallel to the fold line (30) of the flange along the periphery of the panel. The roller is journalled for rotation on an arm (34) pivotally carried by a slide (36) which is moved by a drive cylinder (44) along a lineal path generally parallel to the fold line of the portion of the flange to be prehemmed. As the slide moves linearly the arm is pivoted to move the roller transversely by a follower (46) carried by the arm and received in an elongate cam track (48) having a portion contoured to impart pivotal movement of the arm to cause the roller to follow the desired path of travel substantially parallel to the fold line of the flange for prehemming the flange by bending it to an acute included angle relative to an adjoining portion of the panel. <MATH> |
