Heidelberg offset press waterway adjustment

(This article is an original article from Bisheng. It is forbidden to reprint, and reprinting must be corrected)

Often, the more precise the equipment, the stricter the adjustment of the mechanism. Heidelberg printing machine is the same, no matter where the adjustment of the equipment must be accurate and precise, and requires to be digital. This is different from many of our domestic offset printing equipment. Many domestic equipment are more experience-first in the adjustment process, often one master one method, one master one standard. In terms of the contact pressure of various parts of the waterway, many teachers use steel sheets to insert the test and adjust it, of course, there are limitations of the equipment itself (the water wheel of the water roller in the author's memory can only Trial adjustment with steel sheet).

And the same method used in Heidelberg's printing machine is prone to problems. Due to the use of steel sheet for debugging, it is difficult for the same master to feel the friction at different stages or different masters, so the problem of adjusting the contact pressure of the water roller will often occur. If the pressure adjustment is a little lighter, this situation can easily be reflected by the water condition on the plate, or reflected from the printing work (such as the screen dots are blurred). If the land and water pressure is high, it is often not easy to see that the expensive water roller will be crushed within a few days. I found this kind of thing in many printing houses. A very important reason is that the operator still likes to adjust the pressure of the water roller with a steel sheet when using the printing machine.

The author recommends that Heidelberg operators may try the following adjustment methods recommended by Heidelberg. It may be cumbersome to use this method at first, but you will definitely find many benefits after using it a few times. As for what benefits can it really bring to the operator? Then you have to realize slowly during the operation.

Before adjusting, it is necessary to know that all adjusting screws (except the support spring of the middle roller) have their specific adjusting direction. Turn the screw clockwise to increase the contact pressure, and turn counterclockwise to decrease the contact pressure.


Picture 1

The first adjustment should use the note method; after the adjustment, light ink should be used to verify the results.

Preparation before adjustment:

â’ˆ Install the printing plate on the plate cylinder.

â’‰ Adjust the ink roller F.

â’ŠInstall the middle roller, connect the ink system and dampening system. Diagonal registration = O.

â’‹Lubricate all bearing points.

â’ŒThe printing machine jogs forward slowly, so that the groove of the plate cylinder faces the paper receiving device.

note

If the groove is under the roller, the adjustment result may be wrong. If the adjustment is made on the premise that the diagonal registration does not return to zero, there may be a problem with the adjustment result.

Water roller A is installed


Figure 2

(1) Insert A (Picture 2 / â‘ ) (the plane of the roll neck points upward) into the bearing of the operation surface (Picture 2 / â‘¡).

(2) Insert the water roller into the bearing of the transmission surface until it contacts the stopper plate, and then push it toward the operation surface.

(3) Tighten the hexagonal screws on the operation surface (Figure 2 / â‘¢) to fix the roller neck in the bearing sleeve.

â‘·Adjust with a piece of paper.

⑸ Insert two paper strips respectively between the rollers to be adjusted on the transmission surface and the operation surface. Place a strip of paper with a width of approximately 5 cm against the rubber roller and a strip of narrower paper (approximately 2 cm) against the smooth roller / plate (Figure 3). The total thickness of the two paper strips is about 0.10 mm.


Figure 3

⑹ Determine the adjustment amount by pulling the paper strip.

Ink pressure unit

First, the dampening unit should be pressed before adjusting the roller, so the position of the roller is the same as the position in the production state.

(1) Press the ENGAGE DAMPENING ROLLERS button to select the dampening unit.

⑵ Press the water pressure roller button again to release the pressure plate unit.


Figure 4

Adjustment of water roller A to water drum R

(1) Insert a paper strip between A and R (the wide paper strip leans toward A).

⑵ Close the pressure dampening unit.


Figure 5

(3) Turn the adjusting screw (figure 5 / â‘ ) to make A and R contact.

When the paper strip is pulled out, the pulling force acting on the operation surface and the transmission surface should be the same.

â‘·Remove the paper strip, at this time the roller is easy to rotate by hand.

⑸ Turn the adjusting screw clockwise on the operation surface and the transmission surface for 1.5 to 2 weeks.

⑹ away from the compressed version unit.


Figure 6

Adjustment of water roller A to printing plate

Insert a paper strip between A and the plate (standard pad height) (wide paper strip near A).

⑵ Press the SET DAMPENING ROLLER button.

(3) Adjust the screws (Figure 5 / â‘¡, 15 / â‘ ) to adjust A to the printing plate. After adjustment, tighten the hex screw on the transmission surface (Figure 7 / â‘¡)


Figure 7

Turn the screw clockwise to increase the force between A and the plate. When removing the paper strip, the pulling force acting on the transmission surface and the operating surface should be the same.

â‘·Remove the paper strip.


Figure 8

Install intermediate roller Z:

Before inserting the intermediate roller, the water roller A and the first inking roller must lean against the plate and ink fountain.


Figure 9

(1) Use the roller core head to insert Z into the assembly frame of the transmission surface and the operation surface (Figure 9 / â‘ ).


Picture 10

⑵Tighten the middle roller between the transmission surface and the operation surface with screws (Fig. 10 / ①).

Adjustment of intermediate roller Z to water roller A


Picture 11

Before adjusting the middle roller:

(1) On the CP2000 console, select the intermediate roller clutch button in the PRINTING UNIT / OVERVIEW menu (select several printing units at the same time) or PRINTING UNIT (printing unit) menu (elected to select a printing unit) , Connect the ink unit and dampening unit. Diagonal registration = 0.

⑵Press the water roller and ink roller together.

(3) Insert a paper strip between Z and A (the narrow paper strip leans toward Z).


Picture 12

â‘·Adjust the screws on the transmission surface and operation surface (Fig. 12 / â‘ ), and push Z gently towards A. (The paper strip should be pulled out with the same tension on the transmission surface and operation surface)

⑸ Take out the paper strip.

⑹Turn the adjusting screw (Fig. 12 / ①) half a turn clockwise.

⑺ Tighten the lock nuts on the transmission surface and operation surface (Fig. 12 / ②).

Adjustment of the intermediate roller Z to the inking roller F:

In order to adjust correctly, the water roller and the form ink roller must be pressed together first.


Figure 13

â‘´ Loosen the lock nut (Figure 13 / â‘ ).

⑵ Unscrew the hollow shaft (Fig. 13 / ②) until it is slightly away from the shoulder iron (Fig. 13 / ③).

(3) Pull the hollow shaft back, contact the shoulder iron again, and feel the spring rebound force (transmission surface and operation surface) slightly.

â‘·After the contact pressure is adjusted uniformly, turn the hollow shaft half a clockwise.

※note

The ink pressure bar produced by the spring is about 3 mm wide.

Install the measuring roller D

(1) Engage D with the gear on the transmission surface, put the roller neck in the bearing sleeve on the operation surface, with the flat end facing upward.

(2) Push the roller D in the direction of the transmission surface until it contacts the stopper plate.

(3) Put the bearing sleeve around the roll neck and tighten it.


Figure 14

Installation of water bucket roller T


Figure 15

(1) Insert the roller T into the bearing on the operation surface (Fig. 15 / â‘ ), and then insert the T into the bearing on the transmission surface.

(2) In the direction of the transmission surface, push the roller toward the stop plate of the bearing sleeve.

(3) Use the bearing sleeve to cover and tighten the roller neck on the transmission surface and the operation surface.

Adjustment of roll D to roll T


Figure 16 Metering roller-water bucket roller

â‘´Insert into the sink.

⑵ Make the fountain solution flow into the sink.


Figure 17 Adjustment from metering roller to bucket roller

(3) Loosen the screws of the bearing plate on the transmission surface and operation surface (Fig. 17 / â‘ ).

â‘·Press the "cleaning dampening roller" button to rotate T and D.

⑸Turn the adjusting screw (Figure 17 / ②) counterclockwise to separate D from T, so that there is a uniform layer of fountain solution on the entire surface of the bucket roller.

⑹ Then turn the screw clockwise to make D and T engage until the middle of the roller becomes dark without water.

⑺Close the roller D in the same way, so that the left and right sides of Y are 10 cm wide with water. Then turn the screw half a clockwise.

â‘»Retighten the locking screw (Fig. 17 / â‘ ).

⑼Use a wrench to position the small hole (Figure 17 / ③) on the marking dial at the bottom. This base position is convenient for the operator to find this position in the future adjustment work.

Adjustment of rollers D to A

※ Note: For correct adjustment, position the opening of the plate cylinder toward the paper collection direction.

â‘´Dry D with a quick cloth.

⑵Turn the adjusting screw (Figure 17 / ④) counterclockwise to separate roller D from roller A.

(3) Insert a paper strip between D and A (the narrow strip is close to D).

â‘·Close the water roller.

⑸ Adjust D to A with the adjusting screw (Fig. 17 / ④), the paper strip must be pulled out with the same pulling force on the transmission surface and operation surface.

⑹ Separation water roller.

⑺Continue to turn the adjusting screw (Fig. 17 / ④) clockwise 1.5 turns.


Figure 18

Check the adjustment of the water roller according to the contact area

※ Note: Before adjustment, first move the printer to the groove of the plate cylinder to point to the paper collection.

(1) Stop the supply of fountain solution and empty the fountain solution.

⑵ Close the dampening system on the operation control of the printing press.

(3) Apply light-colored ink into the inking device and carry out cross-inking.

â‘·Through the printing press operation control system, the intermediate roller Z is in contact with the ink roller and the water roller (seamlessly). Through this operation, the rollers of the dampening unit are inked.

⑸After the ink is evenly connected, stop the machine and wait for a few minutes. The contact points of the ink form contact strips.


Figure 19

The width of the contact area on the rollers of the transmission surface and the operation surface should be the same. If the width is different as shown in FIG. 19, each roller needs to be readjusted.

⑹ Adjust the width of the contact area between A and R to 6 to 7 mm (Figure 19 / ①).

⑺ Contact width between A and printing plate: about 5-6 mm.

â‘» To check the adjustment of A to the printing plate, just put the water roller and ink roller close to the printing plate, and then leave it. The middle roller Z must be in contact with A and F, and its contact pressure will directly affect the width of the ink bar pressed between the two rollers A and F.

⑼ The contact width between D and A should be 6 mm.

⑽ The contact width between Z and F is about 3 mm.

⑾ Jog the printing machine until there is a contact ink strip on the printing plate between A and F.

â‘¿After adjustment, clean all rollers of dampening unit.

Check the even distribution of fountain solution over the entire printing area.

(1) Close the plate water roller, the ink roller and the printing plate, and start the ink evenly.

⑵Set the speed of the water bucket roller on the printing machine console, so that the printing plate is evenly inked on the transmission surface and operation surface.

When the speed of the water bucket roller increases, the printing plate must run smoothly (the ink must be separated in the non-graphic part of the printing plate).

If the printing plate runs unevenly and evenly on the transmission surface and operation surface, the adjustment between D and T must be corrected:

⑶ Separate dampening roller.


Figure 20

â‘· Loosen the tightening screw (Fig. 20 / â‘ ).

⑸ Correct the adjustment by turning the screw (Figure 20 / ②).

Turning the adjusting screw clockwise can increase the pressure between D and T and reduce the amount of fountain solution transferred.

Turning the adjusting screw counterclockwise can reduce the pressure between D and T and increase the amount of fountain solution transferred.

⑹ Tighten the locking screw.

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