| 摘要 |
A centerless sheet metal bending machine is provided for forming cleats in sheet metal. The machine includes a housing having a table upon which a piece of sheet metal can be supported. The housing has a mouth through which the sheet metal can be extended and a gap between an end of the table and the mouth. The machine includes a clamping assembly for holding said sheet metal in place and a bending assembly for forming bends (cleats) in the sheet metal. The clamping assembly comprises a hold down bar and a table bar having a clamping surface. The table bar is link driven between an open position in which the clamping surface of the table bar is spaced from the hold down bar and a closed position in which the table bar clamping surface is positioned beneath the hold down bar. The bending assembly comprising a bending bar mounted on a gear segment which rides in a curved track. The gear segment defines an arch of less than 360° and the track defines a slot so that the machine, when in the start position, can accept sheet metal having a width greater than the width of the machine. To facilitate the bend, the bending bar bending surface defines an obtuse angle with the table bar clamping surface and a complimentary acute angle with the horizontal. The acute angle is preferably less than about 20°.
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