| 摘要 |
Open end spinning apparatus is provided which includes a magnetic reed switch for controlling sliver feed. A yarn sensor magnet attached to a movable yarn sensor engageable with a running yarn is disposed so as to open the magnetic switch and interrupt sliver feed upon occurrence of a yarn breakage. In order to prevent the need for moving the yarn after a piecing operation so as to properly engage the yarn sensor, an auxiliary magnet is provided which is movable into position to magnetically move the yarn sensor away from a blocking position in front of the yarn takeoff passage at a spinning unit. The auxiliary magnet is controlled by way of its position, and/or its magnetic field strength, so as to also selectively control the operation of the magnetic reed switch during piecing operations, while maintaining the sensor magnet, and yarn sensor out of a blocking position in front of the yarn takeoff passage.
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