JPS5594440A - Method and apparatus for terminal heat treatment of elastic plate - Google Patents

Abstract

PURPOSE:To prevent the variations owing to the deformation of the both end heat- treated parts of the elastic plate by forming curved parts to the elastic plate, letting the same fall onto a transfer body, and passing the same into a heat-treating furnace while keeping it upright so that its width direction becomes perpendicular direction. CONSTITUTION:Curved parts r whose axial direction of curvature becomes plate width direction are formed at one or more places by a curving device 5 to the elastic plate a which is let-off from a material feed stand 4. Thence, it is introduced into a guide body 6 and when its leading end reaches a photoelectric tube device 7, it is cut to the specified length by a cutter 8. The cut elastic plate a falls onto a transfer body 1. At this time, the elastic plate a erects on the transfer body 1 owing to the collision energy of this time and the elastic repulsion force of the curved parts r. With the both end heat treating parts of the elastic plate a being held protruded to the both sides of the transfer body 1, it is loaded into a heat treatment furnace 2, where it is heat treated. At this time, the both side heat treating parts of the elastic plate 1 are held perpendicularly and are therefore prevented from being deformed by the heat. In addition, the changing of the length in the heat treating parts does not occur.