There are two types of horizontal folding methods in the newspaper rotation class, one is an impact folding and the other is a splint folding. As the impact folding has the advantages of simple structure and convenient adjustment, it has been widely used by newspaper round planes. Although impact folding also exists when the speed of the machine changes, the seam position on the newspaper product will change, especially when the newspaper printing ink is relatively large, it is easy to be embossed by the folding clamp and other shortcomings, but the right amount For newspapers that are not very demanding, as long as the problem is not so severe, these shortcomings of the impact folding machine will be completely covered by its post and telecommunications.

The working process of the impact folding machine is as follows:

1 After the printed strip is folded vertically by the triangle board, it is hooked by the guide pin on the folding roller through the guide stick and pull stick;

2 The tape passes between the folding cylinder cutting knife pad and the cutting cylinder cutting blade, and the serrated cutting blade cuts it into a single sheet;

The planetary folding knife on the 3 folding rollers inserts the newspaper into a pair of folding clamps to complete the transverse folding;

Four-fold newspapers fall from the folds of the folder into the wing wheel and are then sent to the conveyor belt.

To use a good impact folding machine, the key is to make adjustments to the folding cylinder. However, this is also difficult to grasp. The following example of a Japanese Gaussian impact printer is an example.

1. Relative position adjustment of folding roller and cutting roller

During assembly, the cutting blade pad of the folding cylinder should be facing the zigzag cutting blade on the cutting cylinder. The folding roller and the cutting roller are driven by a pair of meshing gears. The cutting roller and the transmission gear are keyed. The folding roller and the transmission gear are connected by a long hole screw. Changing the connection position between the long hole and the screw can achieve the purpose of adjusting the relative position of the folding roller and the driving roller. Its slight adjustment can be achieved by changing the distance between its pick pin hole and the trimming edge, but it does not advocate adjustment here in actual production.

2. Needle adjustment

The telescopic movement of the picking needle is controlled by the cam on the transmission side. The telescopic stroke of the picking needle is determined by the cam mechanism, but the height of each picking pin protruding from the surface of the folding roller can be adjusted independently. In order to ensure that the picking needle can be fully retracted inside the folding roller, the height of the pin protruding from the surface of the folding roller should be smaller than the retracting stroke of the picking pin. Measure the telescopic height of the needle so that when the folding roller is turned to the maximum value of the picking needle, the height of the picking pin protruding from the surface of the folding roller is 6 mm. In actual production, the height of the picking needle can be fine-tuned according to the requirement of different thickness of the folding pattern.

During the folding process, the picking needle is pre-extended. As the folding drum rotates, the picking pin will stick into the paper tape because the picking time of the picking pin is not required to be accurate, and it is not necessary to consider at the adjustment time. Pick the needle out of time. However, when the folding knife inserts the newspaper into the folding blade clamp, the picking pin must be retracted in a timely manner, that is, the pinching time of the picking pin must be very accurate, otherwise the indenting too late will extend the paper knife and tear the paper, indent too early. Causes the paper to run out of control for a period of time, affecting the accuracy of the folding. In addition, the indentation process of picking needles should also be rapid, so that the picking pin and the planetary folding knife coordinate with each other. When adjusting, release the needle cam fastening screw on the transmission side. If it is too early, the picker cam will move in the forward rotation direction of the folding roller, and the taper cam will face the folding roller when it is too late. Move in the opposite direction.

3. Adjust the knife height

The main axis of the folding knife is to make planetary motion by the folding drum operation gear, so that the folding knife shaft has auto-transmission and revolution. The transmission ratio of the auto-transmission and co-rotation of the folding knife is expressed by the relationship between the number of teeth of the sun gear and the planetary gear. The autobiography is actually the planetary wheel autobiography. The revolution of the folding knife is the rotation of the folding cylinder. The folding knife is extended 3 times for each revolution of the folding cylinder. The phase difference is 30%, and it only extends downwards. , Only then interleaved between the folding rollers to complete the transverse folding action.

According to the principle of mechanics, only when the folding length is equal to half of the center of the center of the folding knife shaft to the center of the folding roller, the trajectory of the blade near the folding pinch roller is a triangular star curve, and the position of the folding seam is accurate. The length of the knife is too long. The trajectory of the knife edge at the folder roller is a small circle. The length of the knife is too short. The trajectory of the blade at the folder roller is a small arc. The height of the blade on the surface of the folding cylinder is 40 cm.

4. Adjustment of folding knife and folding roller position

Adjust the long hole screw on the gear shaft of the folding knife shaft and change the position of the long hole and the screw to change the phase of the knife so that the relative relationship between the folding knife and the folding bar can be adjusted.

When adjusting, apply ink to the knife edge of the knife, rotate the folding roller, and check the coloring of the folding knife and the folding pinch roller. Under the condition that the clearance between two folding nip rollers is 0.22 mm, it is not preferable that the folding nip rollers on both sides of the folding knife are colored. Since a newspaper has undergone vertical and horizontal folding, it has been folded into four layers here, so this accuracy can meet the requirements for use.

5. Adjustment of folding knife position in newspaper

After assembling the newspaper rotary machine, the distance between the cutting position of the newspaper and the picking pin has been determined. Adjusting the position of the folding knife in the newspaper folding line is actually adjusting the distance between the folding line of the folding knife and the picking pin hole.

Two folding knives in the symmetry position of the folding roller are fixed on the folding roller by a unified bracket. Fixing screws are arranged on both sides of the roller. Positioning and adjusting the top thread are performed at both ends of one of the folding knife shaft frames. When adjusting, loosen the fixing screw and the positioning adjustment screw, and use the positioning adjustment screw to move the two folding knifes to the required position by the same distance. After the adjustment, the top wire and the screw can be fastened again. . When the newspaper is printed, the alignment of the folded paper is adjusted to the normal printing speed. When the picking side paper surface is too short, the folding knife shaft bracket is moved in the reverse direction of the folding drum; when the picking side paper surface is too long, the folding knife bracket is moved in the forward rotation direction of the folding drum. Note that there is a reference 0-point mark on the folding roller and the knurled shaft holder, align with the 0-point mark, the amount of movement at both ends should be equal. When printing magazines that need to be bound, consider that the amount of trimming should be reduced as much as possible.

When adjusting the position of the fold line, although the front and rear positions of the folding knife on the folding roller are changed, the relative position of the folding knife and the folder roller is not affected. As the folding knife shaft holder is moved, the driving gear of the folding knife shaft also moves accordingly, and the entire planetary gear mechanism does not change. Therefore, the contact relationship of the folding knife during the insertion between the folding rollers is not affected.

Due to the change of position of the folding knife shaft frame on the folding cylinder, it is the working relationship between the folding knife shaft pre-picking needle and the folding knife. However, it should be noted that if the length of the side of the paper is increased, the picking cam should be moved in the forward direction of the folding drum; if it is adjusted by reducing the length of the side of the pick, it should be selected. The needle cam moves in the reverse direction of the folding roller.