| 摘要 |
There are not used scores of plane lower molds different in size and shape. In stead, there are used one or a few pairs of lower bar molds provided with a push spring, etc. as a rotary control. By controlling the rotation of the lower bar molds, the metal plate is pressed thereby to the metal contact surfaces of lower bar molds. The pressure of the upper mold is properly conveyed to the metal plate. According as the bending angle of the metal plate for which it is used, it is neatly bent and there are formed no scratches thereon. Thus, improvements are made in the bending preciseness and quality of the metal plate. The apparatus provided with rotary control function for bending metal plates by controlling the rotation of metal contact surfaces on two (2) lower bar molds by the control of the push spring by lifting the pull-up rod attached to the support against the resilience of the push spring for bending the metal plate by loading the reverse convex surfaces of two (2) lower bar molds semicircular in section so as to rotate slidably on the support provided with two (2) concave surfaces having the groove in the intermediate thereof, by attaching the upper end of the pull-up rod rotatively to the rim part or reverse concave surface of two (2) lower bar molds, placing each pull-up rod projectively on the side of the support so as to run through the stopper provided on the support and setting the push spring on the projected part of each pull-up rod, simultaneously putting the fixture on the lower end of each pull-up rod, fixing the push spring set on each pull-up rod on the side of the support in such manner as to be retained by the stopper and fixture, placing the metal plate on the metal contact surfaces of two (2) lower bar molds, and rotating the metal contact surfaces of two (2) lower bar molds in V-shape by pressing the metal plate on the lower bar molds and thereby bending the metal plate. The apparatus provided with rotary control function for bending metal plates in U-shape by controlling the rotation of metal contact surfaces on two (2) lower bar molds by the control of the push spring by lifting the pull-up rod attached to the support against the resilience of the push spring for bending the metal plate in U-shape by cutting off lengthwise the adjacent odd part/parts between the metal contact surfaces of two (2) lower bar molds semicircular in section to form the odd press part/parts, loading the reverse convex surfaces of these two (2) lower bar molds so as to rotate slidably on the support provided with two (2) concave surfaces having the groove in the intermediate thereof, attaching the upper end of the pull-up rod rotatively to the rim part or reverse convex surfaces of two (2) lower bar molds, placing each pull-up rod projectively on the side of the support so as to pass through the stopper provided on the support, setting the push spring on the projective part of each pull-up rod and, simultaneously, attaching the fixture on the lower end of each pull-up rod, attaching the push spring set on each pull-up rod on the side of the support so as to retain the spring with the stopper and the fixture, placing the metal plate on the metal contact surfaces of two (2) lower bar molds, pressing the metal plate on the lower bar molds by the tip-rounded upper mold, subjecting the metal plate to the first stage bend in U-shape and thereafter subjecting the metal plate to the second stage bend in U-shape by rotating the odd press part/parts of two (2) lower bar molds.
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