| 摘要 |
When processing a stem of a felled tree using a timber-working device, it is useful to centralise the stem relative to the drive mechanism of the device in order to improve effectiveness and accuracy of the device’s operation. Existing devices rely on manual control by an operator to achieve this. An automated method is provided for locating at least one stem relative to a feed axis of a frame of a timber-working device having a first pair of arms and a second pair of arms, each pivotally attached to the frame. The method includes receiving, at a controller, a signal indicating initiation of closure of the second pair of arms to grasp at least one stem currently grasped by the first pair of arms. In response to the signal indicating initiation of closure of the second pair of arms, and during closure of the second pair of arms, the first pair of arms are opened in accordance with at least one predetermined control parameter. The first pair of arms are closed once the opening of the first pair of arms has met the at least one predetermined control parameter. |
