Patent GB-190714995-A (GB)
Title: Improvements in or relating to Veneer Cutting Machines
Inventor: BOULT ALFRED JULIUS
Filed: 1907-06-29
Granted: 1907-11-07
Abstract: 14,995. Boult, A. J., [Nonnast, L. F.]. June 29. Cutting-up &c.- The knife of a veneer-cutting machine is made to compress the flitch, the strains produced being taken by the framing, and the knife is automatically cleansed to avoid breakage of veneers. The flitch h, Fig. 3, is fixed on a staylog D<2> with a strengthening-arch d<11>, attached to a slide D<3> reciprocated in vertical guides d<9>, d<10> by a crank and connecting-rod from a shaft D', which is operated by chain-gearing from a shaft geared to the driving-shaft so that it may operate synchronously with an horizontally-reciprocating knifecarriage B driven by the same shaft. The knife b<3> is carried by a support B', which is pivoted at the point b to the carriage B, and carries standards B<2> at each end to support blocks B<3>; these are bifurcated to receive guide-blocks B<5> which are revolubly mounted on a shaft B<4> rigidly fixed to the blocks B<3>. The guide-blocks B<5> slide in a guide B<6>, which is provided on its upper surface with members having ranged flanges, so that it can slide towards the work on inturned flanges on the two frame members C, but is fixed longitudinally. At each side of depending flanges b<8> from the guide B<6>, bars B<7>, B<8> are arranged, connected together by plates b<12> , and carrying wedges B9, Fig. 5. One of these bars has bevel surfaces b<17> and notches b<18>, which are alternately engaged by one of the spring- catches B'‹, B" on the knife-carriage so as to move the bars to the left or right respestively. The wedges act on similar wedges b<15>, which support them on flanges b<13>, Fig. 11, and are fixed to the frame C, to move the guide B<6> away from or towards the work and hence tilt the knife-support on its pivot away from or towards the work. When the catches by the motion of the knife-carriage engage cams B<12> on the guide B<6>, they are disengaged, Fig. 9. The knife-blade b<3>, Fig. 18, is double-bevel in shape, the base compressing the flitch ; the strain produced is resisted by the guide B<6> and frame members C. A presser-box b<33> with flat surface b<34> is adapted to press on the flitch above the knife, and-the veneer is caused to pass between the concave surface of the knife and the convex surface of the bar, kept close together to prevent gumming of the knife and consequent breakage of the veneers. The presser-bar is mounted on an angle-bar b<30>, Fig. 11, having end flanges b<31> and triangular vertical ribs b<32>, which is fixed to brackets b<24> adjusted by set-screws b<28> on a shaft B<17>, to which they are fixed by slots and bolts b<26>. The shaft is square except at the ends, which are rounded and pass through brackets b<23> fixed to the guide B<6>. The presser being thus pivoted on the shaft B<17>, it is moved out of contact with the work on the idle stroke by a link b<37> and lever b<18> pivoted to a block secured to the guide B‹, and the veneer passes along an apron b<21> pivoted to the brackets b<22>. At the end of the cutting-stroke, a cam B<14>, Fig. 5, on the knife-carriage moves the presser out of contact, and on the return of the carriage it is still held in that position by a cam B<15> on the bar B<7>, until this bar is moved by the catch B'‹. The movement of the bar is limited by setscrews b<36> abutting brackets b<23>. A stop-bar g, Fig. 9, is fixed on the guide B<6> to limit the motion of the bars B<7>, B<8>. The stay-log carriage D' is fed forward by screws D<7> and ratchet-mechanism consisting of an eccentric and rod, Fig. 15, a pawllever e<3> and pawl e', which may be raised out of gear with the ratchet-wheel by a cam e<5>, having a slot to receive the screw-stem D<7> and having an arm e<6> ; this arm may be raised by a crank e<8> operated by a handle, which is held in position by a spring-pin engaging a hole in the frame. The stems of the feed - screws have thrust collars embracing the bearings to take up the strain on the stay-log. Specifications No. 1884, A.D. 1859, and No. 13,478, A.D. 1888 ; and No. 18,312, A.D. 1894, [Abridgment Class Fuel, Manufacture of], are referred to.