| 摘要 |
A method and apparatus for making rectangular frames, e.g., for doors, are described. Stiles and headers are spaced apart on conveyors, automatically closed into rectangles, and fastened at the corners without clamping them together. Fastening means, e.g., staple guns, are suspended to pivot through arcs above the frame and inject fasteners when they are in the bottom dead center position in the arcs. Stiles with lockblocks attached can be rotated to position the lockblocks inside the rectangle.
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