Bearing type handle roller cutter

An apparatus comprising:

• a handle body comprising an upper cover and a lower cover, wherein the upper cover and the lower cover are configured to attach with each other, and wherein a first portion of the lower cover comprises a first through-hole;
• a bearing configured to be disposed in the first through-hole, wherein the bearing comprises an inner wall and an outer wall configured to rotate relative to each other, and wherein the outer wall of the bearing is connected to a wall of the first through-hole;
• a circular blade comprising a second through-hole at a center portion of the circular blade;
• a screw assembly comprising a screw and a nut, wherein:
• the nut is disposed at the first portion of an exterior surface of the lower cover and covers the first through-hole,
• the circular blade faces an interior surface of the lower cover,
• the screw is configured to pass through the second through-hole and the first through-hole, and attach to the nut;
• an exterior surface of the screw connects to the inner wall of the bearing;
• the screw applies a tangential force on the inner wall of the bearing causing the inner wall to rotate relative to the outer wall when the circular blade is rotated;
• and
• a rigid plate attached to the first portion of an interior surface of the lower cover, wherein the rigid plate comprises a third through-hole that encircles the first through-hole in which the bearing is disposed, and wherein the rigid plate provides rigidity to a structure of the lower cover.

An apparatus comprising:

• a handle body comprising an upper cover and a lower cover, wherein the upper cover and the lower cover are configured to attach with each other, and wherein a first portion of the lower cover comprises a first through-hole;
• a bearing configured to be disposed in the first through-hole, wherein the bearing comprises an inner wall and an outer wall configured to rotate relative to each other, wherein the outer wall of the bearing is connected to a wall of the first through-hole, wherein the bearing is a ball bearing comprising a plurality of balls disposed between the inner wall and the outer wall, and wherein the inner wall rotates relative to the outer wall when the plurality of balls rolls inside an area between the inner wall and the outer wall;
• a circular blade comprising a second through-hole at a center portion of the circular blade;
• a screw assembly comprising a screw and a nut, wherein:
• the screw is configured to pass through the second through-hole and the first through-hole, and attach to the nut;
• an exterior surface of the screw connects to the inner wall of the bearing;
• and
• the screw applies a tangential force on the inner wall of the bearing causing the inner wall to rotate relative to the outer wall when the circular blade is rotated;
• and
• a rigid plate attached to the first portion of the lower cover, wherein the rigid plate comprises a third through-hole that encircles the first through-hole in which the bearing is disposed, and wherein the rigid plate provides rigidity to a structure of the lower cover.