Three roll AI/TI decurler using resistive torque loading for uniform penetration
Publication Date: 2003-Aug-15
The IP.com Prior Art Database
This invention proposal enables a low inertial mass, low cost three roll decurler for both AI and TI decurling.
Three roll AI/TI decurler using resistive torque loading for uniform penetration.
A decurler must provide both AI and TI decurling depending on a number of paper and machine factors.� To provide this capability, existing decurlers rely on straining the paper.� The most modern technology uses an elastomer roller pressed against a small roller to strain the sheet.� The problem is the small roller deflects and must be supported.� An additional problem is that in order to provide both AI and TI either two independent decurlers must be made or a three roll decurler must have low enough inertial mass to allow reversing in a very short amount of time, that is between inter-copy gaps.
This invention proposal enables a low inertial mass, low cost three roll decurler for both AI and TI decurling.� The idea is to use a resisting torque to self load the small roller, called the pinch roller (about 6mm dia.), into the elastomer roller (about 30mm dia.; with 4mm elastomer coating).� Figure 1 and 2 shows the concept.� Figure 1 shows the decurler inducing TI curling of sheet to counter-act AI curled sheet. Figure 2 shows the decurler inducing AI curling of sheet to counter-act TI curled sheet.� By using this method of self-loading there will be no deflection of the pinch roll shaft.� Also, the penetration can be adjusted by adjusting the resistive torque.� This can easily be done using servo or stepper motors.