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By means of the longitudinal tribrach, a first fold is obtained in the longitudinal direction of the paper, and the movable folding knife extends out of the folding cylinder and punches the paper, pushes the paper between two continuously rotating folding rollers 4 and compacts the folded placard. And send it to the receipt flower drum. A folding device that folds according to this principle is called an impact folding machine. The impact folding machine has a simple structure and is suitable for high-speed printing, but the folding accuracy is slightly lower.
Second, the principle of folding folding
The paper that has been cut off is folded on the folding cylinder 2 and the output cylinder 1, picked up by the picking needle 4, and on the connecting line of the rolling drum, the elastic folding knife 5 pushes the paper 3 into the neutral position of the rotating drum 2. The cleats 6 and 7 are clamped along the fold line and taken away by the drum 2, and the folding knife exits from the crease. A device that uses a folding knife of one cylinder and a clamping plate of another cylinder to complete folding in relative rolling is called a tumbler.
The scroll folding machine has high folding accuracy and high speed, and it is generally used in roll paper printing presses. Depending on the number of folds completed and the type of signature, different numbers of folding cylinders and folding solutions are used.
Third, knife folding principle
Knife folding is the use of a folding knife 1 to press the paper 4 between two relatively rotating folding rollers 2 and then fed out by the folding rollers to complete a folding process. The folded paper is taken away by the conveyor belt and enters the second fold and the third fold.
Knife-folding has a high accuracy, and the fact that the signatures are folded and stitched is due to the inertia of the knives, and the folding speed is slow.
Fourth, the barrier folding principle
The sheet 4 sent by the sheet feeding device is conveyed through the two rotating folding rollers 2 into the folding fence. When the sheet is hit against the fence plate 5, the printed sheet is forced to be bent into half pairs and folded into the middle of the folding roller 3 The first folding page is completed, and then the folded one-folded booklet is placed in the next folding fence. The second and third folding are performed in the same way. It was finally sent to the paper delivery desk to complete the folding of a book.
First, the impact of folding principle