Patent ID: 8336357

Claim:
A roller dice device comprising: a pair of rolling rollers respectively including circumferential rolling grooves formed at outer circumferential surfaces thereof; a supporting portion rotatably supporting the pair of rolling rollers respectively around roller axes extending in parallel with each other; a spaced portion configured by a rolling portion, through which a rolling material moves, and formed by the circumferential rolling grooves facing each other; a restricting portion formed at the outer circumferential surfaces of the pair of the rolling rollers and restricting displacement of the pair of rolling rollers relative to each other in the axial direction of the roller axes, wherein the restricting portion includes a first cylindrical surface formed at one of the outer circumferential surfaces to be in parallel with the roller axes, an outer taper surface extending along an end of the first cylindrical surface toward a radially outer direction of one of the rolling rollers, a second cylindrical surface formed at the other of the outer circumferential surfaces to be in parallel with the roller axes, and an inner taper surface extending along an end of the second cylindrical surface toward a radially inner direction of one of the rolling rollers, wherein the first cylindrical surface is formed at both sides of the rolling roller in a direction of the rollers axes across the circumferential rolling groove, wherein the second cylindrical surface is formed at both sides of the rolling roller in the direction of the rollers axes across the circumferential rolling groove, wherein each of the first cylindrical surfaces is provided between the circumferential rolling groove and the outer taper surface in the axial direction of the roller axes to directly connect to the circumferential rolling groove and the outer taper surface, wherein each of the second cylindrical surfaces is provided between the circumferential rolling groove and the inner taper surface in the axial direction of the roller axes to directly connect to the circumferential rolling groove and the inner taper surface, and wherein the outer taper surface contacts the inner taper surface in the axial direction of the roller axes so that the restricting portion restricts the displacement of the pair of rolling rollers.