Abstract A positioner includes a feeler rod extensible by a piston carried by a pivotably mounted cylinder biased toward a normal position actuating a switch to one condition. When a log is moved laterally by a bottoming out type of setworks of a head rig into engagement with the feeler rod, the cylinder is pivoted away from its normal position to actuate the switch to a different condition, which causes an indication of a precise position of the log. A setworks in which a series of additively connected cylinder drives functions to locate a knee means for a desired cut on a log. A setworks in which a vernier adjusting mechanism precisely locates the knee means, which is held in position by an independent stopping means, and wherein while the knee means is so held the vernier mechanism is reset for subsequent full range operation.
In combInation, feeler means at a sawline having a log contact member, setwork means for advancing a log laterally toward and past the feeler means, means responsive when the contact member is engaged by the forward side of the log for indicating a position of the log in which the forward side of the log is at the sawline, and retracting means for lowering the contact member out of the path of the log to permit the setworks means to advance the log beyond said position, the retracting means comprising a cylinder for raising the contact member to an extended position in the path of a log and for lowering the contact member to a retracted position out of the path of a log, said responsive means including sensing means responsive to the contact of the log with the contact member for giving an indication of the contact.
Claim 2
Dependent Claim
148 words
In combInation, feeler means at a sawline having a log contact member, setwork means for advancing a log laterally toward and past the feeler means, means responsive when the contact member is engaged by the forward side of the log for indicating a position of the log in which the forward side of the log is at the sawline, and retracting means for lowering the contact member out of the path of the log to permit the setworks means to advance the log beyond said position, the retracting means comprising a cylinder for raising the contact member to an extended position in the path of a log and for lowering the contact member to a retracted position out of the path of a log, said responsive means including sensing means responsive to the contact of the log with the contact member for giving an indication of the contact.
Claim 3
Dependent Claim
22 words
The combination of claim 1 including mounting means mounting said cylinder pivotally, and limit switch means operable by pivoting of said cylinder.