solution Contentsolution Content

HP Scitex LX850 and LX820 Printer Series - Load a roll onto the spindle

Single-roll printing and double-sided printing

The spindle has a pneumatic connector at one end and a gear at the other.
  1. Rest the roll securely on the Spindle Supports.
  2. Check that the gear is on the correct side (which depends on the intended winding direction).
  3. Insert the spindle into the roll.
    The spindle is quite heavy in order to ensure stiffness and so avoid skew and wrinkles, so two people are recommended for this operation. With only one person, you are recommended to put the roll on the Spindle Supports, lift one end of the spindle and insert it into the roll, then lift the other end carefully so that the first end does not fall out, and push the spindle into the roll.
  4. Connect the air gun to the pneumatic connector on the spindle, and inflate the spindle so that it cannot move inside the roll.
  5. Note the position of the end of the roll on the scale marked at the geared end of the spindle. Its position should be not less than 3.2 cm on that scale, otherwise the substrate may go out of the print zone and start touching the printer covers. The input and output rolls should be positioned identically on their respective spindles.
    When loading heavy rolls of inelastic substrates that are approximately half the spindle length, you may find it useful to load the substrate closer to the center of the spindle, to reduce the risk of skew, wrinkles and telescoping.
If the substrate is telescoped on the input roll, there is a risk of substrate jams and damage to the printheads. Try to straighten the edges of the substrate to minimize telescoping on the input roll before loading it into the printer.
Check that the substrate is attached to the input core.
The roll is now ready to be loaded into the printer.
If you are a regular user of different substrate types, you can change rolls more quickly if you preload rolls of different substrate types on different spindles. Extra spindles are available for purchase.

Dual-roll printing

You can print on two rolls at the same time by using the dual-roll spindles provided with your LX850 printer or available as accessories for your LX820 printer.
The dual-roll spindle is marked to assist you in positioning the differential hub.
Loading the dual-roll spindles
  1. With the spindles inserted into the Spindles Supports, Ensure that the differential hubs on the input and output spindles are aligned with each other.
  2. When both differential hubs are correctly positioned, use an Allen key 4 to tighten the screws and secure them in place. If a differential hub is loose, the substrate could become skewed during printing.
    You should tighten the screw until the washer touches the bolt. If you can still see the yellow spring, tighten the screw further.
    It will be easier to load the roll onto the spindle if you lock the differential.
  3. At each end of the spindle, unscrew and remove the outer parts of the hub, using an Allen key 4.
  4. Unscrew and remove the inner part of each hub.
  5. Insert the first roll on the spindle.
  6. Replace the hub, and secure it with the Allen key.
  7. Insert the second roll on the spindle.
  8. Replace the hub, and secure it with the Allen key.
  9. Ensure that the end of the right-hand roll is located within the maximum allowed distance from the right-hand end of the spindle: it should be between the gear and the dashed line.
  10. Ensure that the roll core fits tightly on the hub.
  11. Ensure that the roll core fits tightly on the differential hub.
  12. Load the spindle at the rear of the printer, and secure the spindle latches.
  13. Use the same process to load the output spindle at the front of the printer, but load the spindle with two empty cores to receive the printed substrate.