| 摘要 |
An automatic grinding device for sharpening the knives of a forage harvester chopper drum includes a controller including a counter for counting the number of times the grindstone is adjusted toward the chopper drum during sharpening operation. The controller includes a microprocessor having a non-volatile memory in which may be store d a threshold value, determined by the type of grindstone, to which the count of the count er may be compared for generating a signal indicating the degree of wear of the grindstone so that it may be replaced when worn out.
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