Trimmer flexible positioning fence

A board positioning device for selectively positioning, in a lateral direction in a generally horizontal plane, relative to a laterally spaced array of trimmer saws, a board translating in a longitudinal direction on a lugged transfer chain in said horizontal plane, wherein said board is aligned along its length in said lateral direction, said device comprising:

• a selectively deformable flexible fence, lying generally in said longitudinal direction in said generally horizontal plane, mounted to a supporting frame along a lateral edge of said lugged transfer chain, said flexible fence rigidly mounted to said supporting frame at a single upstream location along said flexible fence, thereby defining a downstream end, distal from said single upstream location, of said flexible fence, downstream relative to said translation of said board in said longitudinal direction on said lugged transfer chain,
• fence positioning means for selectively deforming and positioning said downstream end of said flexible fence in said lateral direction in said generally horizontal plane so as to deform said flexible fence along a curved transition path to a board optimizing position, said fence positioning means rigidly mounted to said supporting frame and to said downstream end, so as to extend between said supporting frame and said downstream end,
• board ending means for laterally urging and translating said board against said flexible fence when said flexible fence is selectively deformed and positioned in said board optimizing position, said board ending means mounted to said supporting frame so as to engage said board on said lugged transfer chain,
• board disengaging means mounted to said supporting frame for selective disengaging of said board from said board ending means while said board is being translated on said lugged transfer chain.