| 摘要 |
A detector unit (30) for use in a wire handling machine (10) includes an encoder (38) for monitoring movement of the wire (26) along a wire feed path (28) and for detecting the presence of a splice (130) and the end of the wire (26) as it is being fed. The shaft (58) of the encoder is electrically interconnected to the frame (12) of the machine by means of a brush (66) and leaf spring (68) and includes an enlarged diameter (62) for engaging and being driven by the wire being fed. A presser member (84), which is electrically isolated from the frame (12), is arranged to urge the wire against the enlarged diameter (62) so that when a the wire is fed it causes the shaft (58) of the encoder to rotate proportionately. When the controller unit (126) detects wire movement that is substantially different from that expected, the machine is stopped and an appropriate message is displayed. When a splice (130) is present the presser member (84) is momentarily electrically interconnected to the frame (12) through the splice and the enlarged diameter (62). Similarly, when the end of the wire (26) being fed reaches and passes through the detector unit (30) the presser member (84) electrically engages a stop surface (94) thereby electrically interconnecting the presser member (84) to the frame (12). When this grounding of the presser member (84) is detected by the controller unit (126) the machine is stopped and an appropriate message is displayed.
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