Patent ID: 8181897

Claim:
A winding device, comprising: a first winding roller, which is rotatable in a predetermined direction and has a circumferential surface that defines a plurality of grooves; a plurality of core support plates, which is arranged at a predetermined distance below the first winding roller, an interval between the core support plates and the first winding roller being defined as a curved channel, having an inlet end and an outlet end, wherein a web material is fed into the inlet end and conveyed out the outlet end to reach a winding zone where the web material is wound as a roll; a plurality of arms, each comprising an extension section, which is extended a circular arc portion at a lower end thereof to stretch into a respective groove of the first winding roller, the circular arc portion having a bottom side facing the curved channel and forming a protuberance, wherein when the arms are driven to move downward to a clamping position, the protuberances of the circular arc portions are projected from the circumferential surface of the first winding roller; and when the arms are driven to move upward to a home position, the protuberances of the circular arc portions are retracted back into the grooves of the first winding roller; and a planetary-roller tear-off mechanism comprising: a plurality of rotary arms, which is set at a predetermined location below the first winding roller, each rotary arm having a driving end and a free end, wherein the driving end is coupled to a shaft, and a plurality of planetary rollers, each of which serves as a passive rotatable roller and is mounted to the free end of the respective rotary arm to result that the planetary roller is driven to rotate according to a rotation axis, wherein when the free end of the rotary arm rotates to a location facing the protuberance of the circular arc portion of the respective arm and the circular arc portion of the arm is moved downward to the clamping position to have the protuberance of the circular arc portion projecting beyond the circumferential surface of the first winding roller, the web material is clamped between the protuberance of the circular arc portion and the planetary roller to temporarily stop the web material conveying, and the roll located in the winding zone being continuously rotated still, the web material is subjected to a force acting thereon and thus torn off.