Stitch flap cutting block

A cutting machine for cutting blanks for boxes and the like, provided with a cutting block comprising a body having a first side mountable to a lateral side face of a first rotatable cutting head of the cutting machine, a compression spring housed within a recess in the body, the recess extending from a mouth portion on a top face of the body into the body, a removable cap closing an end of said recess, and a blade extending transversely across the top face of the body opposable with a second head of the blank cutting machine, wherein:

• the body is provided with a slot that intersects with the mouth portion of the recess, within which the blade is constrained to move, the slot being oriented at an angle greater than zero degrees from a normal to said first side of the body;
• the blade is mounted, within the recess, to the compression spring housed within the recess,
• the blade is so mounted to the compression spring as to be resiliently retractable into the body, and
• the blade is so mounted to the compression spring as to be freely pivotally displaceable within the slot;
• whereby
• when the body is mounted to the lateral side face of the first rotatable cutting head of the blank cutting machine, the blade extends transversely to the direction of rotation of the first rotatable cutting head and an angle between the blade and a normal to said direction of rotation is greater than zero degrees, and the blade is adapted to produce a slicing action when cutting a tapered edge in a board being cut.