| 摘要 |
A control coupling for a delimbing and cutting apparatus, provided for feeding means and for changing their feeding speed, and compirising at least two feed motors (1, 2) driven by a pressurized medium, each of the motors being intended to drive a feeding means which is intended to be placed against a tree trunk and to feed the tree trunk through said apparatus, a first channel (4), via which the pressurized medium can be supplied to the first feed motor (1) and alternatively returned therefrom, and a second channel (5), via which the pressurized medium can be returned from the second feed motor (2) and alternatively supplied to the same. Said feed motors are multi-capacity motors, wherein each motor (1, 2) has at least a first rotational capacity (1a, 2a) and at least a second rotational capacity (1b, 2b) as well as a first and a second basic connection for each capacity. The first basic connections of each motor (1, 2) are coupled together as a first connection (R1, R2), and the second basic connections of each motor (1, 2) constitute a second connection (A1, A2) and a third connection (B1, B2), which are separate. The control coupling further comprises first valve means for coupling at least two different feeding speeds in operation, wherein the valve means are arranged to couple desired connections (A1, A2, B1, B2, R1, R2) and channellings (4, 5) together.
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