| 摘要 |
Electrical elements are moved by vibrator apparatus to a position below a multi-arm having a plurality of circumferentially spaced pickups to which respective tubes are connected. The spider is on a post that is moved in steps, and at the end of each step is raised and lowered. Via a control element around which the spider moves, each pickup tube is connected to a vacuum source as it reaches a pickup station, so that it captures a single element, and is maintained on vacuum through a test station to a drop station, where the vacuum is cut off and the element is released and directed to a receptacle selected as a result of a measurement previously made at the test station. Test contact arrangements shown include spaced spring contacts on nonconductive discs releasably mounted on a post, and spaced contacts wherein one is mounted on such a disc and the other is on the pickup. For the latter, connection to a stationary terminal is effected through a respective wiper for each contact carried by the spider structure. Also shown is photoelectric detection and associated air blast apparatus for returning components to the vibrator which do not have predetermined light reflective surfaces facing upward.
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