| 摘要 |
<p>Apparatus and methods involving lacing or tying cord about end turn portions of coils that project beyond faces of dynamoelectric machine magnetic cores. Method involves pulling and holding final cord segments; and subsequently releasing such segments. In apparatus, stator core having coils therein is placed at tying station and supported while the core and tying units are periodically relatively indexed. Loops of cord are placed about winding portions, for example in the formation of stitches. As the last loop (e.g., stitch) in a tying cycle is commenced, cord pulling member and core are moved relative to each other so that the cord pulling member is located to receive a final cord segment. Alternatively, cord pulling member moves after full development of final cord segment. A portion of final cord segment is grasped in a cord receiving region of cord pulling member. Cord clamping member engages and tightly holds the cord; cord pulling member retracts; and final cord segment is pulled taut and severed. The leading or advancing end of the cord pulling member may be of a blunt or pointed configuration. When a core is to be laced or tied, an end of cord is held in the cord puller and at least part of one or more loops (e.g., stitches) are made on the wound stator assembly. At a predetermined time or after a predetermined number of stitches (or portions thereof) have been made, the end of cord is released. Such release is effected before excessive tension is applied to the core so as to reduce, if not eliminate, cord fraying and cord debris build-up in and around the cord puller. This also prevents malfunctions that might occur as a result of excessive tension on a cord end during indexing of a core being laced.</p> |
