Patent ID: 6298887
Filing Date: 2001-10-09
Classification: B27C,F16H

Abstract:
A wood planing machine comprising:an elongated machine base having a top surface, opposed left and right mounting short sides, and opposed feed-in and take-out long sides, said feed-in long side being disposed in front of said take-out long side;left and right pairs of posts fixed on said top surface of said machine base at said left and right mounting short sides, respectively;a cutter carriage disposed above said machine base, and having opposite end portions mounted respectively, vertically and movably on said left and right pairs of posts;vertical left and right threaded rods mounted respectively and rotatably on said left and right mounting short sides of said machine base such that said drive rods are disposed respectively between said left and right pairs of posts and extend threadedly through said opposite end portions of said cutter carriage for moving said cutter carriage along said posts when said threaded rods rotate on said machine base, thereby adjusting height of said cutter carriage relative to said machine base;two sprockets sleeved respectively and fixedly on said left and right threaded rods;an endless transmission chain engaging said sprockets so as to rotate said left and right threaded rods synchronously with each other, said chain having a front chain section that is disposed adjacent to said feed-in long side of said machine base, and a rear chain section that is disposed adjacent to said take-out long side of said machine base; anda chain tensioner device includinga movable pushing piece disposed movably inside said chain,a guiding unit for guiding said pushing piece to move horizontally between said front and rear chain sections of said chain, anda biasing unit for biasing said pushing piece to contact and move one of said front and rear chain sections away from the other one of said front and rear chain sections, thereby tensioning said chain.