(57) The invention relates to a corner knife mechanism (100A, 100B) of a welting machine
(10). The corner knife mechanism (100A, 100B) includes a plurality of first corner
knives (101, 102, 101A, 102A) having different cutting edge angles (θe1, θe2) or different
mounting angles (θ1, θ2), a plurality of second corner knives (103, 104, 103A, 104A)
having different cutting edge angles (θe3, θe4) or different mounting angles (θ3,
θ4), a corner knife holder (105) on which the first and second corner knives are arranged,
a knife selecting actuator (121) which moves the corner knife holder (105) in a direction
(Y) along which of the first and second corner knives are arranged, a cutting actuator
(131, 132) which selectively moves up and down the first and second corner knives;
and an operation control means (80) which controls the knife selecting actuator (121)
and the cutting actuator (131, 132) to select a combination of one of the first corner
knives and one of the second corner knives and to form a corner cut. The first corner
knife and the second corner knife of the combination are symmetrically oriented with
respect to the cloth feeding direction (F) and have the same mounting angle (θ1, θ3;
θ2, θ4) or the same cutting edge angle (θe1, θe3; θe2, θe4).
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