Patent ID: 8870480
Filing Date: 2014-10-28
Classification: B41F,B41J,B41P,B65H

Abstract:
1. A roll-to-roll printing system comprising: driven rolls configured to apply a feeding force to a flexible substrate so that the flexible substrate is fed from an unwinder to a rewinder; nip rolls respectively disposed above two opposite end portions of each of the driven rolls, the nip rolls configured to pressurize two opposite side portions of the flexible substrate; nip roll driving motors connected to the nip rolls, the nip roll driving motors configured to rotate the nip rolls; a control unit configured to receive information regarding a change of torque values of the nip roll driving motors and to control tension of the flexible substrate based on the information; nip roll units including the nip rolls and pressurizing cylinders, the pressurizing cylinders configured to pressurize the nip rolls; and nip roll unit driving motors connected to the nip roll units, the nip roll unit driving motors configured to spin the nip roll units, wherein the control unit is configured to control the tension of the flexible substrate in a cross machine direction based on information regarding a change of torque values of the nip roll unit driving motors.