Heidelberg 102 series offset press (continued)
(This article is an original article from Bisheng. It is forbidden to reprint, and reprinting must be corrected)
※ Adjustment of delivery tooth
(1) Tools used
When adjusting the delivery tooth, the following auxiliary tools are required:
1. Dial WLm22 231 and its corresponding fixing device WLm22 232/1, positioning tool WLm22 149;
2. Test tool WLm22 1077 (part number 00.894.0565), including two test shafts and a test roller; (see Figure 1)
Figure 1
3. In addition, when a set of paper delivery rollers or paper delivery rows are provided, there is often a set of optional positioning shafts (part number 27.013.095 = full set)
There are three pairs of positioning shafts for precise selection. The tolerances are as follows (Figure 2):
Figure II
Part number 27.013.032
Part number 27.013.094
Part number 27.013.093
(2) Operation process
1. Install the dial.
2. The machine moves to the exchange position 204o between the delivery tooth and the impression cylinder.
Note: If a compensator is installed on the delivery tooth, set the compensator cam to the "0" position before making various adjustments to the delivery tooth.
3. Turn the delivery tooth in the reverse direction, as shown in Figure 3, so that the gap between the delivery tip and the front edge of the impression cylinder is 1 mm.
Install the gear on the transmission surface at this position and tighten the fixing screw.
Figure three
4. Remove the two positioning axes A (Figure 4) of the transmission surface and operation surface, and replace them with the test axis WLm22 1077 shown in Figure 1. This axis is 0.26mm smaller than the actual positioning axis size.
Figure 4
5. In order to adjust the two inner cams 27.013.003 / 004, continuously turn the machine to the dial reading 11 o30 ′ (equal to the paper feeding tooth leading the paper picking position on the paper feeding board by 0 o30 ′ or the paper feeding tooth and the paper feeding board become 90 o angular position).
Be careful when the positioning rod contacts the test shaft, because the cam is loose!
At an angle of 11 o 30 ′, the positioning rod B must be in contact with the test axis A.
6. Insert a steel sheet of 0.02 mm between the inner cam C and the pendulum drive ball D. Fix the cam with the cam close.
7. Swing out the paper tooth, install the outer cam E, and position it with the test ball F in the test tool WLm22 1077. After positioning, the test ball must move flexibly and without gap between the two cams. pin.
8. Remove the two test axes A WLm221077 and install the positioning axis 27.013.095 just removed, and then move the machine to the position 11o30 ′
At this time, you should be able to manually rotate the positioning axis A27.013.095 and feel some resistance. If the positioning shaft rotates too loosely or too tightly, you need to select the positioning shaft in Figure 2.
9. After the delivery teeth are turned over the paper pick-up position on the cardboard, the row of teeth slowly leans against the set screw A (see Figure 5), at this time between the cam B27.013.003 / 004 and the pendulum drive ball C The clearance should be at least 0.02 mm.
Figure 5
When the set screw A is turned for unexpected reasons, the adjustment parameters of the delivery row must be checked. In this case, the test tool WLm5020 (part number 00.894.0087) is required for adjustment.
10. Turn the machine to a position convenient for inspection as shown in Figure 6.
Figure 6
Note: At this position, cam ball C cannot contact cam B.
The inspection work is carried out separately on the transmission surface and the operation surface.
Remove the reference plate X of the test tool WLm5020, place the test tool positioning surfaces I and II on the axis D, rotate the test tool in the direction of the tooth row, and check whether points III and IV are in contact with axes E and F.
This correction can be made on the set screw A. For this, the delivery tooth must be swung back to the position shown in Figure 7.
11. Rotate the paper-feeding teeth to the position of picking paper on the cardboard. Use the random tool 27.024.005 to adjust the delivery pad to the "paper" position.
12. Continuously rotate the machine until the delivery teeth turn to the position shown in Figure 7.
Figure 7
This inspection should be carried out under the machine.
Install the reference board of the test tool WHm5020, and use this tool to measure the height of the dental pad. To this end, the teeth on the transmission surface and the corresponding measuring point in the central position should be removed first, and the distance from the bottom of the axis B to the delivery pad A should be 169.8mm.
13. If the value is not 169.8mm, you must adjust the position of the delivery pad A, and then adjust the positioning block 27.013.080 as needed and tighten the positioning pin.
14. The cam 76.013.038 controls the swing lever cam 66.013.044 of the transmission surface and the operation surface. These two swing lever cams control the movement of the opening and closing teeth of the paper feeding teeth on the cardboard.
The paper delivery teeth of the transmission surface and the operation surface should be in contact with the swing lever cam at the position shown in Figure 8. The distance between the contact point and the front end of the swing lever cam is 5 to 7 mm.
Figure eight
15. The swing lever cams on both sides should be in contact with the delivery ball at the same time. At this time, the roller of the swing lever 66.012.081 must be located at the highest point of the cam 76.013.038.
Adjust the swing lever cam and hinge the positioning pin holes as needed (if the adjustment is accurate, the maximum opening size of the delivery teeth before taking the paper on the cardboard is 10.5 ~ 11.5mm).
16. On the cam 76.013.038, correct the paper picking time of the delivery teeth on the cardboard. Swing the paper delivery tooth to the position of hAO at a 90 ° angle between the dental pad and the paperboard, and check the dental slices with a thin paper strip. Rotate the cam until the paper strip can be just taken out, and check the condition of each tooth piece separately. If necessary, adjust the dental blade adjustment screw C (Figure 7).
17. The opening time of the delivery tooth and the impression cylinder is adjusted by the transmission surface and operation surface cam 27.013.048. The opening time of the delivery tooth is 205o, and the time for the delivery tooth and the impression cylinder to hold the paper together is 1 o (1 o = 2.35 mm).
Note: The contact time of the cam ball and the cam on the transmission surface and the operation surface should be the same.
18. Adjust the front gauge to the maximum gripping position, arrange a piece of paper, and check whether there is enough distance between the front edge of the delivery blade and the front edge of the paper to prevent the paper from touching the blade.
19. Finally, it is necessary to check whether the opening range of the delivery teeth is proper when the machine stops feeding after the paper is fed (failure of paper feed). At this time, it is necessary to be able to easily insert 0.2 mm thick jammed paper on the delivery blade.
※ Analysis of some faults in the paper delivery tooth
(1) The first color of the printed product
After the equipment is used for several years, the first color overprinting rule of the printed product is often larger than the back color, especially the trailing part of the paper is more serious, and the overprinting of the paper in the up and down direction is accurate. This phenomenon is called flicker. .
The reason for the flick angle is that the paper is not flat enough or the mouth is inconsistent when it enters the first color. It forms micro-wrinkles when printing the first color. These micro-wrinkles are partially or completely crushed when printing the next few colors, making the first color ratio The back is big.
The reason for the flicker angle caused by the failure of the delivery tooth is as follows:
â‘ When picking the paper at the paper transfer table, the closing time of each tooth is inconsistent, which makes the paper not smooth enough during the handover, causing a flick angle;
â‘¡The backing spring of the paper delivery tooth is damaged or backing activity, so that the paper delivery tooth cannot produce sufficient gripping force when closing the tooth, and the paper edge of part of the tooth part is dragged backward. When handing over the first color impression cylinder, each tooth The size of the film mouth is inconsistent, causing a flick angle;
â‘¢The tooth closing time of the paper delivery tooth is too late, even when the paper delivery tooth starts to move, it is not completely closed, which makes the handover process unstable and causes a flick angle;
â‘£ There are dead teeth on the paper delivery teeth. These dead teeth seem to be closed or too tight when handing over, making the gripping force of each tooth inconsistent, and the paper edges of some teeth are dragged backwards to form a flick angle;
⑤ Due to poor maintenance or wear of related parts, the movement of the delivery shaft is inflexible, and the gripping force of each tooth is insufficient during the handover, and the paper edge of some teeth is dragged backwards, causing a flick angle;
â‘¥ The opening ball of the delivery tooth is worn or the opening and closing tooth cam is improperly adjusted, which makes the delivery time inaccurate and causes the flick angle;
⑦The large spring of the paper tooth is broken, the spring shaft or bearing is worn, or the pendulum drive ball is worn, which makes the pendulum's movement time inaccurate and causes a flick angle;
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