| 摘要 |
<p>A double-acting cylinder piston unit for controlling the feed motion of a saw blade relative to a workpiece in a mechanical frame saw having a stationary machine frame, a housing part pivotally mounted on the machine frame and a saw frame guide movably mounted in the housing part and carrying a saw blade. The piston of the cylinder piston unit is pivotally connected to the machine frame, while the cylinder thereof is pivotally connected to the pivotally mounted housing part. The cylinder includes a cylinder head in the form of a block, and the unit includes a reservoir delimited by one face of the block, a first wall extending from, and substantially perpendicular to, the one face and a second wall spaced from, and substantially parallel to, the face. The block is provided with two bores each defining a portion of a flow path between a respective cylinder chamber and the reservoir; each bore communicates with its associated valve and forms the seat for a throttle valve communicating with its associated chamber. A flow path between the reservoir and one cylinder chamber includes a tube extending within the cylinder and along the axis thereof from that bore in the block which forms a part of the same flow path. The piston is provided with an axially extending bore communicating with the one cylinder chamber and into which said tube extends, and the piston bore is sealed in a manner to permit relative movement, in the axial direction of the cylinder, between the tube and the piston.</p> |
