Impact folding principle

借助于纵折三角板，沿纸张的纵向获得折，活动伸出折页滚筒冲折纸张，将纸张推至两个连续旋转的折辊4之间，将所折页帖压实，并传送到收帖花滚筒。按此原理进行折页的折页装置称为冲击式折页机。冲击式折页机结构简单，适于高速印刷，但折页精度稍低。

With the help of the longitudinal folding triangle, the paper can be folded 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.

滚折式折页原理

Roll folding principle

已经断切待折的纸张在折页滚筒2和输出滚筒1上，由挑针4挑住转动，在对滚滚筒的连心线上，弹性折刀5将纸张3入滚筒2的空档中，夹板6和7沿折线将其夹紧，并由滚筒2带走，折刀从折缝中退出。利用一个滚筒的折刀和另一个滚筒的夹板在相对滚动中完成折页的装置称为滚筒式折页机。

The paper that has been cut and to be folded is held and rotated by the pick-up needle 4 on the folding drum 2 and the output drum 1. On the connecting line of the 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.

滚动式折页机折页精度较高，速度快，一般用在卷筒纸书刊轮转印刷机上。根据所完成的折页次数，折帖的类型，采用不同数目的折页滚筒和折页方案。

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.

刀式折页原理

Knife folding principle

刀式折页是采用折刀1将纸张4压入两个相对旋转的折页辊2之间，再由折页辊送出，完成一次折页过程。完成折页后的纸张被传送带带走，进入第二折，第三折。

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 paper after folding is taken away by the conveyor belt and enters the second and third folds.

刀式折页具有较高的精度，书帖折缝压的实，由于折刀的运动惯性，折页速度较慢。

Knife folding has high precision, and the folding seam of the book is pressed. Due to the motion inertia of the folding knife, the folding speed is slow.

栅栏式折页原理

Principle of fence folding

由输页装置送出的印张4，经过两个旋转的折页辊2，输送到折页栅栏里，撞到栅栏档板5时，印张便被迫弯曲成对半形折入折页辊3中间，完成折折页，然后将折过一折的书帖到下一个折页栅栏里，用同样的方法进行第二、第三折。后被送到收纸台，完成一个书贴的折叠工作。

The printing sheet 4 sent out 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 a 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.

冲击式、滚折式、刀式以及栅栏式这四种是常见的折页方式，每一种都有各自的特点。实践固然重要，但是理论知识是实践的提和基础，二者不可荒废其一。

Impact type, roll folding type, knife type and fence type 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.