| 摘要 |
Apparatus for sensing contaminant material or hung-up work pieces on mandrels, such as the core rods of injection blow molding machines, consists of a sensing member adapted to be moved through a programmed path corresponding to the bottom contour edge of the mandrel and to give an output responsive signal when any material or work piece remains on the mandrel and interrupts the programmed movement of the sensing member. Generally, one or more horizontally extending mandrels are checked by a sensing member linked through a connecting member with a cam following a cam track corresponding in shape and located below the bottom contour edge of the mandrel to be checked. In the preferred form of the invention, an injection blow molding machine includes an automatic stripper and checker, in which stripping fingers associated with the connecting member precede the sensing member and thus strip a preformed work piece off the mandrel simultaneously with the checker sensing member movement along the mandrel length. Preferably, the sensing member consists of a horizontally disposed rod adapted to travel along either one or a plurality of parallel core rods with the sensing member forming part of an electrical circuit. Upon engagement of the sensing member with hung-up material or work piece, the sensing member is adapted to yield downwardly and thereby to open the circuit and provide a responsive output signal.
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