| 摘要 |
In the automatic threading device for the sewing machine, the treading rod is lowered and rotated, and the threading hook is automatically inserted into and through the needle eye. However, if the presser-foot detector detects the presser-foot is lowered, the threading rod is prohibited from being operated. Alternatively, if the operation detector detects the sewing-machine motor is being operated, the threading rod is prohibited from being operated. Consequently, even if the operator by mistake presses the threading switch during sewing operation when the presser foot is lowered or the sewing-machine motor operates, the threading rod is prohibited from being driven. Therefore, the threading hook is prevented from being damaged. The threading switch can be provided on the front panel of the sewing machine, near the start-stop switch or in any other easily accessible position.
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