Impact folding principle
With the help of the longitudinal folding triangle, the folding is obtained along the longitudinal direction of the paper, the movable folding knife extends out of the folding roller to fold the paper, pushes the paper between two continuously rotating folding rollers 4, compacts the folded paper and transmits it to the collection roller. According to this principle, the folding device for folding is called impact folding machine. The impact folding machine has simple structure and is suitable for high-speed printing, but the folding accuracy is slightly low.
Roll folding principle
The paper that has been cut and to be folded is held and rotated by the pick-up pin 4 on the folding drum 2 and the output drum 1. On the connecting line of the opposite rolling drum, the elastic folding knife 5 puts the paper 3 into the neutral of the drum 2, the clamping plates 6 and 7 clamp it along the folding line and take it away by the drum 2, and the folding knife exits from the folding seam. The device that uses the folding knife of one drum and the splint of another drum to complete folding in relative rolling is called drum folding machine.
The rolling folding machine has high folding accuracy and high speed. It is generally used in the rotary printing machine of Web books and periodicals. According to the number of completed folding and the type of folding, different number of folding rollers and folding schemes are adopted.
Knife folding principle
Knife folding uses a folding knife 1 to press the paper 4 between two relatively rotating folding rollers 2, and then sent out by the folding roller to complete a folding process. The folded paper is taken away by the conveyor belt and enters the second and third folds.
Knife folding has high precision, and the book folding seam is pressed. Due to the motion inertia of the folding knife, the folding speed is slow.
Principle of fence folding
The printing sheet 4 sent by the page conveying device is transported to the folding fence through two rotating folding rollers 2. When it hits the fence baffle 5, the printing sheet is forced to bend into half shape and fold into the middle of the folding roller 3 to complete the folding, and then the folded book is pasted into the next folding fence, and the second and third folding are carried out in the same way. Then it is sent to the paper receiving table to complete the folding of a Book sticker.
Impact folding, roll folding, knife folding and fence folding are four common folding methods, each of which has its own characteristics. Practice is important, but theoretical knowledge is the basis of practice. One of the two should not be abandoned.
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