Patent ID: 7739936

Claim:
A paper punch comprising: an operating member; a die; and a die holder with an upper jaw member and a lower jaw member which are spaced apart from each other by a slot; wherein said operating member is operable to move said die relative to said die holder to punch at least a piece of paper out from a sheet of paper received within said slot of said paper punch; wherein said upper jaw member of said die holder includes an unpowered restrictor adapted to limit the extent of relative movement between said upper and lower jaw members; wherein insertion of said piece of paper into said slot causes said restrictor to move relative to said upper jaw member along a path substantially parallel to a path of movement of said die relative to said die holder; wherein said lower jaw member has a flat surface facing said upper jaw member; and, wherein, when in an absence of said sheet of paper within said slot, said restrictor contacts said flat surface of said lower jaw member wherein said restrictor is a wheel member that has a hole with a diameter larger than that of a pin about which said wheel member is rotatable, the maximum extent of relative movement between said upper and lower jaw members is determined by the difference between said diameter of said hole of said wheel member and said diameter of said pin.