This machine is equipped with a mechanism to keep the ITB and ITB roller straight and centered. The position of the belt is corrected by moving the far end of the belt centering roller when the ITB strays from the center. Viewed from the far end of the belt centering roller toward the back of the machine, the movement to correct positioning is as follows:
- When the slant of the belt centering roller is tilted left, the ITB moves to the front.
- When the slant of the belt centering roller is tilted right, the ITB moves to the rear.
After the ITB returns to the center position, the centering roller stops at the adjusted position, and then normal operation continues.
The centering roller is moved to its slanted position by the belt centering motor.
Just before the belt centering correction operation starts, the belt centering roller HP sensor [A] detects the arm [B] of the belt centering roller at its home position.
After movement to home position [A] is completed:
If this home position detection operation (homing) fails, the machine will issue SC471-02. The home position sensor checks the belt centering roller to make sure that it is positioned correctly:
- At power on
- When the machine recovers from Energy Save mode
- When the front doors are closed
- After lubrication
No. | Name |
|---|---|
1 | Belt Centering Motor |
2 | Belt Centering Roller |
3 | Belt Centering Roller HP Sensor |
4 | Belt Centering Sensor |
5 | PTR Separation Sensor |
In this belt transfer system:
- The ITB must remain centered over the image transfer roller, so the unit is provided with a mechanism to do this.
- The belt centering sensor [4] monitors the rear edge of the ITB to make sure that it is straight.
- The belt centering sensor [4] switches on the belt centering motor [1] to operate the pulley that can nudge the belt centering roller [2] to straighten the belt.
- A belt steering HP sensor [3] switches off the belt centering motor after adjustment is done.
- The position readings of belt centering sensor [4] are used to determine the slant of the steering controller adjusted at the end of the roller toward the back of the machine. These readings are used to correct ITB skew, but if centering roller has skewed too far out of position at either the front or back (readings of sensor [4] determined to be out of range), then the machine issues an SC code (ITB positioning eror).
- SC471-03, -04, 05 are ITB positioning error codes 1, 2, 3, and SC471-006 is the belt centering sensor error. If for any reason the position of the ITB centering roller cannot be corrected, or if there is no input from the belt centering roller HP sensor, the machine will shut down automatically to prevent damage to the fragile ITB.