| 摘要 |
A placket sewing machine is provided for attaching a placket patch to a fabric part of a garment. The placket patch and fabric part are positioned in overlying relation to form a multiple layer placket assembly. The placket patch has a leading end for being fed together with the fabric part through the sewing machine, and a trailing end. A sewing head is mounted above the base of the machine, and includes at least one reciprocating sewing needle. The sewing head is operatively connected to a motor for actuating the sewing needle. A controller controls operation of the sewing motor. A throat plate supports the overlaid placket patch and fabric part on the working surface of the machine base in an area of the sewing needle. The throat plate includes a side extension located outside of the area of the sewing needle. A ply-sensing assembly including a transmitter and receiver is operatively connected to the controller for automatically stopping operation of the sewing motor and needle upon sensing the trailing end of the placket patch. The extension of the throat plate defines a port therein for holding the receiver in signal passage alignment with the transmitter during placket sewing operations.
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