Patent ID: 7955005

Claim:
A roll rotation mechanism which is used to continuously rotate a roll at a constant rate, comprising: a motor; a gear-type reduction mechanism for reducing the rate of output rotation of the motor; and a shaft coupling for transmitting the reduced-rate output rotation of the gear-type reduction mechanism to the roll; wherein the shaft coupling forms a connection between a drive-side shaft part positioned on a side of the gear-type reduction mechanism and a driven-side shaft part positioned on a side of the roll in such a state as to have latitude of movement about a central axis of the shaft coupling, and wherein when the roll is continuously rotated at a constant rate, the latitude of movement of the shaft coupling is not present in a rotational direction of the roll so that rotational torque is transmitted via the shaft coupling, but is present in a direction opposite to the rotational direction so that a vibration transmission path via the shaft coupling is blocked.