On the four-color machine inking roller handle the ups and downs chattering

PZ 4 8 8 0 - 0 1 A, B type offset printing cylinder bearing the three are: the impression cylinder is supported by two fixed bearings, rubber roller is composed of two eccentric slide bearing, on the one hand it effect from the clutch, the other is also used to adjust the center of the blanket cylinder and the impression cylinder from the plate cylinder is composed of two sliding bearing eccentric for adjusting the center distance. Three printing cylinders specific work situations as described below.

 

First, from the blanket cylinder, combined pressure principle

 

Figure 1 shows: forks 5 wraps under loads fulcrum O 4 sliding back and forth through the rod 4, the coupling plate 3 (the right side of the fulcrum when the coupling plate can be seen as a fulcrum), the eccentric shaft 2 driven squeegee angle of rotation α sets, rubber rollers mounted on the eccentric shaft kit, relying on the body, outward rotation of the eccentric side, pushing the blanket cylinder and the plate cylinder and the impression cylinder from and cooperation.

 

Second, the center distance adjustment principle

 

Outwardly by the press body and a set of icons of the mechanism for adjusting blanket cylinder and the impression cylinder of the center distance, the figure 9 is to adjust the header 8 is limited dead nuts position, it can only rotate, no will retreat. Turn the adjusting nut 8 Table 9 driven rotation of the lead screw 7 generates retreat movement, pushing or pulling the lever 6 driven coupling plate moves to the left or right (center distance adjustment, the fork lever 5 can be regarded as stationary), By coupling plate lever 2 O 1 around the eccentric rotation, thus changing OO 2 distance, so that the blanket cylinder and the impression cylinder center distance can be adjusted. Plate cylinder and blanket cylinder center distance from the plate cylinder eccentric adjustment.

 

Three, PZ4880-01B using the clutch, pressure regulating device as shown in Figure 2: When a combined pressure signal, the electromagnet 13 work will be pushed to hold the pawl 12 tooth 11 notches in the combined pressure cam under the action of pushing the swing pole teeth 11, so brace teeth 11 to promote cooperation through the pawl 12 finale rotation, thus through the combined pressure agencies to promote 1 0 a - 5 a - 4 a - 3 a - 2 a-by eccentric body and 1 0 b - 5 b - 4 b - 3 b - 2 b-outward eccentric work in parallel, in order to make the blanket cylinder combined pressure; away from the pressure action is mainly through this mechanism to achieve reverse rotation of the eccentric sleeve. Center distance adjustment, turn the adjusting nut in Table 9 a-8 a-rotating screw 7 a move - push lever 6 a-2 a and 4 a change in the distance between, thereby changing the blanket cylinder and the impression cylinder center distance (DPRK outside empathy).

 

Get your sleeve eccentric clutch pressure regulator works well with the actual work process, I think the models inking roller handle the ups and downs chattering to make a superficial analysis:

 

1. Printing pressure caused by excessive inking roller jitter

 

Open by body panels, combined pressure machine running along each link Find a vibration source. Observed eccentric vibration is large, touch and hold the pawl 12 tooth 11, I feel a slight vibration. The vibration transmission path: through 2 a, 3 a, 4 a transfer to 5 a, then transmitted through the hinge point of lever 1, the ups and downs of the inking roller handle vibration. Then you can judge from this vibration between three rollers, one may be due to excessive pressure bag lining inappropriate, on the other hand may be due to center distance adjustment problems. In order to ensure eradication of stress issues, from the dispatch center distance adjustment work begins. We used to measure the drum shell gap (mainly on account of roll pillow fouling, measurement is not necessarily accurate, but the drum body wrapped in a bag lining, relatively clean), remove the bag lining, the drum surface with a pencil drawing three pitch 5 cm parallel to the cylinder axis parallel lines and three lines were labeled good left, right, nine measurement points. Jog the machine manually close the three rollers, measuring the impression cylinder and the blanket cylinder gap, measured with butter applied to the measurement point, clipping a short fuse 5 mm diameter stick in butter, after exit after rolling off, thousands of scorecard measurement instructions directly transferred to a predetermined gap. And then in the other two parallel lines, and then were measured mainly used to check whether a consistent gap roller surface, there may be 0. 0 1 mm such small differences, so not a big problem (if the difference is significant, it should Check the drum surface is concave pressure, depression can be a small amount of rubber to make up shimming, large depression only repair drum), followed by filling in the form will get the value, the average value considered as a liner thickness data. Secondly blanket cylinder pressure measurement together with the plate cylinder gap, concocted by the former method. Here are three points to note:

 

First, select the measurement point to note that the impression cylinder of the drum should be selected within the area are often embossed (ie, substrates coated area), outside of the drum surface may corrode low; blanket cylinder liner bag in the package should be selected cover within a region;

 

Second, the fuse should be placed in the measuring point, the surface of the drum to prevent the problem, resulting in uncertainty measurements; Third, figure out adjusting device exists between the amount of air travel, especially if you adjust too far, to go go back to when the stroke volume should estimate included. After careful adjustment, reasonable packings, then boot print, the problem is solved.

 

2. Parts processing quality problems caused by inking roller handle the ups and downs jitter There was once a printing press workers at high speed occurred during the cast member 5 a a connecting hole cracked damaged, replace parts, resulting in a landing ink roller handle jitter phenomenon. The actual control observation, the discovery of new accessories two connecting hole distance is too large relative to the original components, resulting in a total pressure by the body within the organization through force, but also make eccentric joint pressure when pushing excessive, causing by the body, outward two eccentric twisted position. Although the combined pressure state, compensate for this by adjusting the center distance partial lot, so when combined pressure on both sides of the eccentric position accuracy, but after pressure from the blanket cylinder axis is bound to have some distortion, so the good parts should be replaced . Based on this experience, we are on the machine before the new accessories, new accessories can be fitted with two links link dowel pin holes, and then with the old parts fitting, if the two holes can be nested, and then check the fixed bearing shaft hole can match exactly, Three holes relative position accuracy, the machine side to ensure that no danger.

 

3. Inking roller landing bump off the ups and downs caused by inking roller handle jitter:

 

Figure 3 shows: four inking rollers supported by the landing gear 4. Inking roller action by the ups and downs of pushing the pendulum bump 2 3 implementation, when the bump 2 steering Omo, lift lever 3, thus promoting the landing gear 4 on the move, pushed away from the ink roller surface of the plate; when the convex steering facet block, then the pendulum four whereabouts, so that the landing gear down, the ink roller to the plate surface to fall on the graphic ink. If the block 2 is somewhat offset projections, the lever 3 is not completely fall off in place by the bump force F 2 in the printing operation, the roller face with the neutral conversion, generating inking roller vibration, by the landing gear 4 is transmitted to the lever 3, thereby creating a periodic force F, resulting in jitter handlebar 1. At this time, loosen lug 2 Tighten the screws to adjust it to the proper position locking can be.

 

We print in the actual work, often encounter this or that problem, figuring out the appropriate parts of the structure and working principle, the problem determination and resolution is of great help. The above describes three inking roller handle the ups and downs of jitter failure phenomenon, hoping to get experts and colleagues correction.