Finger joint cutter

A finger joint cutter (40, 60), comprising a plurality of blade array groups (44a, 44b, 44c, 44d) made of a plurality of cutting blades (14) aligned at a predetermined pitch (L) along a rotary shaft (R), the cutting blades (14) of each blade array group (44a, 44b, 44c, 44d) in rotation cutting into an end portion of a material (32) to be cut per blade array group (44a, 44b, 44c, 44d) at a same time and thereby shaving a plurality of joint fingers (24) aligned at an identical pitch (L) at the end portion of the material (32) to be cut, wherein

• the cutting blades (14) are either a main blade (46) shaving a valley portion (26) and a slope portion (30) of the joint fingers (24) or an auxiliary blade (48) shaving in proximity to the valley portion (26) of the joint fingers (24),
• the main blade (46) has a rake face (50) in an angle shape being tapered off towards an outer diameter,
• the auxiliary blade (48) is set to have a rake face (54) with a width dimension (l1) parallel to the rotary shaft (R) in a portion on an inner diameter side being smaller than a width dimension (l2) parallel to the rotary shaft (R) in a portion on the inner diameter side in the rake face (50) of the main blade (46),
• the pitch (L) is set to be not less than the width dimension (l2) of the main blade (46), and
• the main blade (46) is provided to be adjacent to the auxiliary blade (48) along the rotary shaft (R) and also not to be adjacent to the main blade (46) with each other along the rotary shaft (R).