| 摘要 |
A sewing machine has a frame formed of a base, a column, a lower free arm having an upper working surface, an upper arm and a head. A retractable shelf is connected to the base by a set of articulated parts comprising panels hinged to three sides of the shelf and arms pivoted to the base at one end and articulated to an intermediate point along the height of each panel at the other end. The shelf is displaceable between an operative level in which it fits around the lower free arm at the working surface thereof and a retracted level below the lower free arm to allow access thereto. Flaps are also hinged to the shelf and can, when the shelf is at the operative level, be folded in line with the panels against the frame to form a case therewith. In both operative and inoperative levels of the shelf, the flaps can be folded down to allow access to the machine for operation thereof.
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