| 摘要 |
A bed portion, minutely speaking, a portion corresponding to a rise-and-fall position of a needle, of a lock stitching machine or an over-lock stitching machine is formed into a unit and combined with a machine proper in a mounting/detaching free state, and uses plural sewing units that are selectively exchanged for each other. The machine proper 1 is formed by cutting of a top portion of a bed 1'' on the right of a needle plate portion, leaving the cut-off portion as a connecting surface 5. A sewing unit 2 or 3 is formed by providing a needle plate 12, feeding teeth 13, a shuttle drive mechanism 15, a cloth feed mechanism 19 or loopers 47 and 49 and their drive mechanism 48 and 58 in one unit body. Its right side is left as a connecting surface 20, and the two elements are combined as one body in a mounting/detaching free state through a shaft coupling 7, a fitting portion 10 and a combining means 11, respectively protruding on the abovementioned two connecting surface.
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