Board lumber position fence
Discloses a positioning fence for use in lumber saw mills that facilitates automated positioning of lumber for cutting. A continuous moving track loop has a plurality of paddles laterally positionable across the width of the track. Each paddle has a brake to hold the paddle in position. A positioning cam releases the brake to align each successive paddle to a desired lateral offset and a zeroing cam resets each paddle to a zero position.
1. An apparatus for positioning lumber pieces comprising:
i) a length of continuous track loop to translate lumber pieces to be positioned operable for movement in a direction along its length, said pieces moving in a direction generally perpendicular to their longitudinal direction along said track loop;
ii) a plurality of paddles spacedly disposed along the length of the continuous track loop, each of said paddles slideably mounted along bearing ways coupled to said track loop, and wherein each of said paddles form a lumber seat for contacting an end of a lumber piece, each of said paddles being laterally displaceable across a width of the track loop;
iii) brake means operable to lock the lateral position of each of said paddles; and
iv) a positioning cam for controlling the brake means to position the paddle and activateable between a locked position preventing lateral movement of the paddle lumber seat and a released position allowing lateral movement of the paddle lumber seat.
2. The apparatus of claim 1 further including biasing means to urge said brake means to lock the lateral position of the paddle.
3. The apparatus of claim 1 further including a reset cam to displace the lumber seat of each paddle into a zero lateral position.
4. The apparatus of claim 1 wherein each paddle includes a positioning cam follower to engage said positioning cam when in the released position and effect release of said brake means to displace the paddle laterally.
5. The apparatus of claim 1 wherein each paddle includes a reset cam follower to engage said reset cam and effect release of said brake means to displace the paddle laterally.
6. The apparatus of claim 1 further including actuator means to move the positioning cam between the locked position and the released position.
7. The apparatus of claim 1 wherein said positioning cam is comprised of a plurality of segments, each said segment activateable between a locked position preventing lateral movement of the paddle lumber seat and a released position allowing lateral movement of the paddle lumber seat.
8. The apparatus of claim 7 further including actuator means for each positioning cam segment to move the positioning cam segment between the locked position and the released position.