Patent ID: 8028423

Claim:
A reciprocating-type cutting blade device, having: first and second driving bodies formed by a pair of plate-like bodies which are superposed in a thickness direction and reciprocatingly driven in opposite directions by a predetermined driving mechanism; first and second cutting blade bodies formed by a pair of plate-like bodies which are integrally reciprocatingly driven by and detachably engaging with non-drive side ends of the first and second driving bodies and which have cutting blades having a predetermined shape on lateral edges thereof; and a pair of detachable guide plates which are disposed on both sides of the cutting bodies and driving bodies in the thickness direction so as to hold the cutting bodies and driving bodies slidably, the reciprocating-type cutting blade device being characterized in that a first boundary is formed between engaging portions of the first cutting blade body and the first driving body, and a second boundary is formed between engaging portions of the second cutting blade body and the second driving body, the first and second boundaries intersect one another only at non-contiguous points in a planar view at all positions during reciprocating motion of the cutting blade bodies and the driving bodies and so that at no point during the reciprocating motion does a line segment of the first boundary register with a line segment of the second boundary.