| 摘要 |
An improved instrument for measuring and indicating the load experienced during a cycle of a machine, as a reciprocating press. A piezoelectric transducer mounted on the press provides a signal which is proportional to the press frame deformation during operation. In one aspect of the instrument, the signal from the transducer is amplified and compared with reference voltages representative of excessive machine load and a minimum load level. During each cycle of operation either a NORMAL, UNDER or OVER (LOW, OK or HI) indicator is actuated. The NORMAL indicator remains on so long as the machine load is within the selected limits represented by the reference voltage. A safety circuit stops the press when an excessive load is experienced. In another aspect of the instrument, the reverse load experienced by the machine is detected.
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