| 摘要 |
A lumber stacker apparatus for moving a course of lumber and depositing the course on a stack of lumber includes a crank mechanism, a fork assembly, an arm member, and motor means. The crank mechanism is operatively engaged to the fork assembly by the arm membe r. The arm member has a crank arm affixed to a crank shaft to move the fork assembly in a reciprocating stroke in response to rotation of the crank shaft. The motor means is operatively connected to the crank shaft to rotate the crank shaft at a constant angular velocity through 200.degree. to 260.degree., preferably 230.degree., to drive the fork assembly through a slow forward stroke, to move the course of lumber, and to rotate the crank shaft through 100.degree. to 160.degree., preferably 130.degree., to drive the fork assembly through a rapid backward stroke once the course of boards has been deposited on the stack of lumber.
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