Veneer lathe
AssigneeMeinan Machinery Works, Inc.
InventorKenzo Watanabe
Life of this patent
Estimating the term…
Abstract
A veneer lathe that can provide a veneer produced by cutting out a log, which is substantially free from surface scratches, and thus can be used as a surface sheet for plywood. A roller bar drives a log while pushing its peripheral surface on the upstream side of a knife fixed to a knife carriage for cutting the rotating log in a log rotating direction. The roller bar 3 has a large number of grooves defined in a peripheral surface thereof. The shape of the grooves 5a in a section crossing the shaft centerline of the roller bar 3 is set so that an angle between a tangent at a corner portion 3e constituted by a line 3d of an outer periphery of the roller bar 3 and a line 3b extending outward from an upstream side face of the grooves 5a is 130 to 160 degrees.
Claims18
A veneer lathe comprising:
- a knife for cutting a rotating log, said knife being fixed to a knife carriage;
- a roller bar provided at a position upstream of said knife in a log rotating direction for pushing a peripheral surface of the log, said roller bar comprising a plurality of grooves formed in a peripheral surface thereof;
- sliding bearings for rotatably supporting said roller bar, said sliding bearings being fixed to said knife carriage and having, when viewed in a section crossing a centerline axis of said roller bar, an arcuate sectional shape opening towards the log and being positioned on a side of said roller bar that is opposite to a side of said roller bar that faces the log;
- and
- a driving source for rotating said roller bar supported by said sliding bearings;
- wherein the shape of each of said grooves, when viewed in said section crossing the centerline axis of said roller bar, is such that an angle between a tangent at a corner of said groove on the upstream side of said roller bar in said rotating direction, which is constituted by a line on an outer periphery of said roller bar, and a first line extending outward from an upstream side face defining said groove, is 130 to 160 degrees.
A veneer lathe comprising:
- a knife for cutting a rotating log, said knife being fixed to a knife carriage;
- a roller bar provided at a position upstream of said knife in a log rotating direction for pushing a peripheral surface of the log, said roller bar having a plurality of grooves formed in a peripheral surface thereof;
- sliding bearings for rotatably supporting said roller bar, said sliding bearings being fixed to said knife carriage and having, when viewed in a section crossing a centerline axis of said roller bar, an arcuate sectional shape opening towards the log, and being positioned on a side of said roller bar that is opposite to a side of said roller bar that faces the log;
- and
- a driving source for rotating said roller bar supported by said sliding bearings;
- wherein the shape of each of said grooves, when viewed in said section crossing the centerline axis of said roller bar, is such that:
- a first angle between a tangent at a corner of said groove on the upstream side of said roller bar in said rotating direction, which is constituted by a line on an outer periphery of said roller bar, and a first line extending outward from an upstream side face defining said groove is 130 to 160 degrees,
- a second angle between a second line extending outward from the downstream side face defining said groove and said first line is at least 70 degrees, and
- a depth from the outer peripheral surface of each said roller bar to the bottom of said groove is at least 0.05 mm.
Dependencies are inferred from the claim text.