| 摘要 |
1,240,437. Shaft speed monitoring. DEERE & CO. 29 April, 1970 [29 April, 1969], No. 20665/70. Heading A1F. [Also in Division H3] A shaft speed monitoring system in an agricultural machine, e.g. a combine harvester; in which an audible and visual signal actuated by pulse producing magnetic pickup means is conveyed to the operator if the speed of one or more shafts in the harvester falls to a predetermined value comprises magnetic actuator elements 64 attached to shafts 21, 23, 25, 28, 34 driving the separator conveyer, tailings conveyer, straw walkers, grain elevators and straw distributors which cause magnetic pick ups 66 to provide one or more electric pulses per shaft revolution to enter a multi channel control system 70. The values of the electronic compopents in system 70 are chosen so that if the rate of pulses falls to a certain predetermined value, corresponding to 80% of the normal shaft working speed in the preferred embodiment, current from the harvester battery 44 is allowed to illuminate an indicator light 106 in the operator's station and blow the horn 100. Electronic delay device 52 provdes a delay of 15 seconds after closure of clutch 42 operated switch 48 to allow the shafts to reach their normal operating speeds before the monitor system becomes operative. The horn 100 can be disconnected from the battery 44 by a switch 120 in the operator's station. |
