| 摘要 |
In a tumbling hammer type rapper (10), a feedback signal is provided via limit switch (30) and cam (28) mounted on rapper shaft (14) to control the rotation of rapper shaft (14) through one revolution. Rapper shaft (14) rotation is monitored to ensure that rapper shaft (14) completes one revolution, returning to the initial position, within a normal predetermined time period. If rapper shaft (14) fails to rotate from the initial position or fails to complete one revolution within the normal predetermined time period, an alarm is energized.
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