Waterway adjustment of Heidelberg offset press
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The more sophisticated the equipment, the stricter the adjustment of the mechanism. The same is true for Heidelberg presses, where adjustments to the equipment are made accurate and precise, and data is required.
The same method is prone to problems when used on Heidelberg's presses. Due to the use of steel sheet debugging, the friction felt by the same master at different stages or different masters is difficult to be consistent, so the adjustment of the contact pressure of the water roller often occurs. If the pressure adjustment is a little lighter, this situation can easily be reflected by the water condition on the plate or from the print (such as the layout of the dots). If the pressure of land and water is large, it is often difficult to see that the expensive water roller will be squeezed out within a few days. I find such things in many printing houses. A very important reason is that the operator still likes to adjust the water roller pressure with steel sheets when using the printer.
The author suggests that Heidelberg operators may wish to try the following adjustment methods recommended by Heidelberg. It may be cumbersome to use this method at first, but with a few times you will find that there are so many benefits. What kind of benefits can you really bring to the operator? Then you have to have a hard-working master to slowly understand the operation process.
It is important to know before adjustment that all adjustment screws (except the support spring of the intermediate roller) have their specific adjustment direction. Turning the screw clockwise means increasing the contact pressure, and turning it counterclockwise means reducing the contact pressure.
The first adjustment should use the paper strip method; after adjustment, the light should be used to verify the results.
Preparation before adjustment:
1. Install the plate on the plate cylinder.
2. Adjust the ink roller F.
3. Install the intermediate roller to connect the ink system to the dampening system. Diagonal registration = O.
4. Lubricate all bearing points.
5. The printing machine jogs forward slowly so that the plate cylinder groove faces the delivery device.
note
If the groove is under the roller, the adjustment result may be incorrect. If the adjustment is made without the zero return of the diagonal registration, the adjustment result may be problematic.
Water roller A installed
(1) Insert A (the plane of the roll neck is pointed upward) into the bearing of the operating surface.
(2) Insert the water roller into the transmission surface bearing until it touches the stopper plate, and then push it toward the operation surface.
(3) Tighten the hexagonal screw on the operating surface to fix the roll neck into the bearing sleeve.
(4) Adjust with a strip of paper.
(5) Insert two strips between the drive surface and the roller to be adjusted on the operation surface. A strip of paper having a width of about 5 cm is placed against the rubber roller, and a narrow strip of paper (about 2 cm) is placed against the smooth roller/plate. The total thickness of the two strips is approximately 0.10 mm.
(6) Determine the amount of adjustment by pulling the paper strip.
Pressing ink unit
First, the dampening unit should be pressed and the roller adjusted, so the position of the roller is consistent with the position in the production state.
(1) Press the ENGAGE DAMPENING ROLLERS button to select the dampening unit.
(2) Press the press water roller button again to depressurize the dampening unit.
Adjustment of water roller A to water roller R
(1) Insert a strip of paper between A and R (wide strip against A).
(2) Pressurized dampening unit.
(3) Turn the adjusting screw to bring A into contact with R.
When the paper strip is pulled out, the pulling force acting on the operating surface and the driving surface should be the same.
(4) Remove the paper strip, at which point the roller is easily rotated by hand.
(5) Turn the adjusting screw clockwise on the operating surface and the transmission surface for 1.5 to 2 weeks.
(6) Deviation dampening unit.
Adjustment of the water roller A to the printing plate
(1) Insert a strip of paper between A and the plate (standard pad height) (the wide strip is near A).
(2) Press the SET DAMPENING ROLLER button.
(3) Adjust the screw to adjust A to the plate. Tighten the drive face hex screw after adjustment
Turn the screw clockwise to increase the force between A and the plate. When removing the strip, the tension acting on the drive surface and the running surface should be the same.
(4) Remove the paper strip.
Install intermediate roller Z:
The water roller A and the first inking roller must lean against the printing plate and the ink fountain before the intermediate roller is inserted.
(1) Insert the Z into the mounting frame of the driving surface and the operating surface with a roller core.
(2) Tighten the intermediate rollers of the drive surface and the operating surface with screws.
Adjustment of intermediate roller Z to water roller A
Before adjusting the intermediate roller:
(1) Select the PRINTING UNIT/OVERVIEW menu (select several printing units at the same time) or the PRINTING UNIT menu (select a printing unit) to select the intermediate roller off/close button on the CP2000 console. , the ink unit and the dampening unit are connected. Diagonal registration=0.
(2) Pressing the water roller and the ink roller together.
(3) Insert a strip of paper between Z and A (narrow strips are facing Z).
(4) Adjust the screws on the drive surface and the operation surface to gently lean Z toward A. (The paper should be pulled out with the same tension on the drive and operating surfaces)
(5) Remove the paper strip.
(6) Rotate the transmission surface and the adjustment screw half a turn clockwise.
(7) Tighten the lock nut on the drive surface and the operating surface.
Adjustment of the intermediate roller Z to the plate roller F:
In order to adjust properly, the water roller and the plate roller must be pressed first.
(1) Loosen the lock nut.
(2) Unscrew the hollow shaft until it is slightly apart from the shoulder iron.
(3) Pull the hollow shaft back and re-contact the shoulder iron, and slightly feel the spring's rebound force (transmission surface and operation surface).
(4) After the contact pressure is adjusted evenly, turn the hollow shaft half turn clockwise.
※note
The ink-indented pressure bar produced by the spring is about 3 mm wide.
Install metering roller D
(1) Engage D with the gear on the drive face, place the roll neck into the bearing sleeve of the operating surface, and point the flatter end upwards.
(2) Push the roller D toward the transmission surface until it contacts the stopper plate.
(3) Wrap the bearing sleeve around the roll neck and tighten.
Installation of the bucket roller T
(1) Insert the roller T into the bearing on the operating surface, and then insert T into the bearing of the transmission surface.
(2) Push the roller toward the stop plate of the bearing sleeve in the direction of the transmission surface.
(3) Cover the drive neck and the roll neck on the operating surface with a bearing sleeve and tighten.
Adjustment of roller D to roller T
Metering roller - water bucket roller
(1) Insert the sink.
(2) Let the fountain solution flow into the water tank.
Adjustment of the metering roller to the water roller
(3) Loosen the screws on the drive surface and the bearing plate on the operating surface.
(4) Press the “Cleaning Dampening Roller” button to turn T and D.
(5) Turn the adjusting screw counterclockwise to separate D from T so that there is a uniform dampening solution on the entire surface of the bucket roller.
(6) Then turn the screw clockwise to engage D with T until the middle of the roller becomes dark.
(7) The roller D is closed in the same manner so that the left and right sides of Y have a water raft of 10 cm width. Turn the screw clockwise half a turn.
(8) Retighten the locking screw.
(9) Use a wrench to position the small hole on the marking dial to the bottom. This base position allows the operator to find this position in future adjustment work.
Adjustment of roller D to A
※Note: For correct adjustment, the opening of the plate cylinder is oriented toward the delivery direction.
(1) Dry D with a quick cloth.
(2) Turn the adjusting screw counterclockwise to separate the roller D from the roller A.
(3) Insert a strip of paper between D and A (the strip is close to D).
(4) Close the water roller.
(5) Adjust D to A with the adjusting screw, and pull out the paper strip with the same pulling force on the driving surface and the operating surface.
(6) Separate the water roller.
(7) Continue to turn the adjusting screw 1.5 turns clockwise.
Check the adjustment of the water roller according to the contact area
※ Note: Before adjusting, first press the printing machine to the groove of the plate cylinder to point to the delivery.
(1) Stop the supply of dampening solution and empty the dampening solution.
(2) Turn off the dampening system on the press operation control.
(3) Applying a light ink to the inking device and performing ink splicing.
(4) The intermediate roller Z is brought into contact with the ink roller and the water-feeding roller by the printing machine operation control system (between seamless). By this operation, the rollers of the dampening unit are inked.
(5) After the ink is evenly inked, the machine is stopped for a few minutes, and the contact points of the ink are formed into contact strips.
The width of the contact area on the rollers of the drive face and the operating face should be the same. If the widths are different as shown in Fig. 19, it is necessary to readjust the individual rollers.
(6) Adjust the contact area width between A and R to 6 to 7 mm.
(7) The contact width between A and the printing plate: about 5-6 mm.
(8) To check the adjustment of A to the plate, simply press the water roller and the ink roller against the plate and then leave it. The intermediate roll Z must be in contact with A, F, and the contact pressure directly affects the width of the ink bar which is pressed between the two rolls A and F.
(9) The contact width between D and A should be 6 mm.
(10) The contact width between Z and F is about 3 mm.
(11) Jog the printing press until a contact ink stick is produced on the printing plate between A and F.
(12) After adjustment, clean all the rollers of the dampening unit.
Check the even distribution of the fountain solution over the entire print area.
(1) Put the plate water roller, the ink roller and the printing plate together, and start the ink.
(2) Set the speed of the water fountain roller on the printing machine console so that the printing plate is evenly inked on the driving surface and the operating surface.
When the speed of the bucket roller increases, the plate must run smoothly (the ink must be separated in the non-image portion of the plate).
If the plate does not run smoothly on the drive and operating surfaces, the adjustment between D and T must be corrected:
(3) Separate the dampening roller.
(4) Loosen the elastic screws.
(5) Correct the adjustment by turning the screw.
Turning the adjusting screw clockwise increases the pressure between D and T and reduces the amount of dampening solution delivered.
Turning the adjusting screw counterclockwise reduces the pressure between D and T and increases the amount of fountain solution delivered.
(6) Tighten the locking screw.