| 摘要 |
In a method, when using a single-grip harvester head for felling and processing trees, of controlling the press power which, by means of a limbin g knife assembly (6), is exerted on a stem (3) which is horizontally fed throu gh th head with its butt end first, the diameter of the stem is measured and th e press power is reduced in accordance with a control diagram as the diameter decreases during the feeding. The measured diameter values are registered, a nd each measured diameter value is compared with a predetermined diameter value which is selected from the diameter values of the stem (3) which are previously registered during the feeding of the stem. If a measured diameter value is found to equal or be greater than this predetermined diameter value , the press power is increased to a corrective power value, which is maintaine d until a later measured diameter value falls below a reference value.
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