Side-to-side Registration
In this machine, rollers in duplex paper path shift to perform side-to-side registration.
After the leading edge of the paper passes the edge detection unit [A], the edge detection sensor [B] shifts in the main-scan direction to detect the paper edge. The edge detection sensor [B] is driven by the edge detection sensor shift motor [C].
For paper with a feed length of 220 mm (8.66 inches) or less (A4 LEF / LT LEF or less), the duplex transport roller 4 [F] and the duplex exit roller [G] shift in the main-scan direction in order to adjust the paper position in the main-scan direction after the leading edge of the paper passes the duplex exit roller [G]. The machine corrects the paper position in the main-scan direction based on the data detected by the edge detection sensor [B]. The duplex transport roller 4 [F] and the duplex exit roller [G] are driven by the duplex transport shift motor 2 [H].
For paper with a feed length of more than 220 mm (8.66 inches) (B5 SEF or more), the duplex transport shift motor 1 [I] drives in addition to the duplex transport shift motor 2 [H], so that the duplex exit roller [G] and the duplex transport roller 2/3/4 [D] [E] [F] move at the same time to adjust the paper position in the main-scan direction. The adjustment amount can be set with SP1-003-017 to 022 (Duplex Side-to-Side Reg Adj: Tray1-3) for each tray. The machine adds the value of SP1-003-017 to 022 to the value of SP1-003-006 (Side-to-Side Reg: Duplex), and then performs image adjustment for the second side. This value is fixed within ±3mm.
Comparing Side-to-side Registration Methods of Similar Models
| No. | Description |
|---|---|
| [A] | The paper enters the side-to-side registration section. |
| [B] | The machine detects the leading edge of the paper. |
| [C] | The paper exits from the side-to-side registration section. |
| [D] | The paper exits from the machine. |
| * | The machine does not have the mechanism for [B]. |
- MPC7501/MPC6501 (Jogger Fence Method)
The registration correction is performed by the jogger fence when the machine transports the paper from the duplex inverter path to the duplex paper path by switching back. Therefore, the paper position and distance between the sheets are not adjusted for the first print side of the paper. The transport distance between the end of the registration section and the image transfer section is long. - MP C6503/C8003, Pro C5200S/C5210S (Roller Shift Method)
The machine detects the leading edge of the paper, and then perform the registration correction with the paper transport roller using the detected data. The registration correction is performed in the duplex paper path. Therefore, the paper position and distance between the sheets are not adjusted for the first side of the paper. The transport distance between the end of the registration section and the image transfer section is shorter than that of MP C7501/C6501. This means that the paper transport stability of this machine is superior to MP C7501/C6501. - ProC751EX/Proc651EX (Roller Unit Shift Method)
Regardless of first side or second side printing, the machine performs the registration correction whenever the paper passes the shift unit in the paper transport section. Therefore, the registration correction is performed before the image transfer for both sides of the paper. This means that this machine has high stability for transporting the paper and high registration accuracy for both sides of paper.