Early domestic stacker application
Web printing presses mostly use the method of folding the pages. The method of receiving the post depends on the form of the printed product and the type of printing machine used.
Most domestic printing plants use domestic web book printing machines for book printing. The earliest domestic printing presses for books and periodicals are all around 2,500 copies / hour. With Beiren JJ204 as the main representative model, it is equipped with a horizontal pager. Power is obtained from the folding machine through gears. There are rollers underneath. It is placed at the side exit when it is opened at 8 and 32. When it is opened at 16, it can be pushed to the front exit for operation.
With the advancement of technology, domestic printing equipment manufacturers gradually no longer produce this type of old-fashioned book printing press, replaced by a new generation of products with a printing speed of 3600 copies per hour and more excellent machine performance, such as the Beiren YP890 and YP787 book printing presses. . At this time, the pager also changed, and replaced with an independent motor drive. Beiren Company was equipped with a model type JWS-02 horizontal pager.
The use of the above two types of page collectors can realize functions such as counting piles, folding and compacting, and discharging air. At the same time, since the folded post can be turned to a higher position by the roller to receive the post, the operator does not need to bend down to work, which can greatly reduce the labor intensity. The JWS-02 horizontal page harvester has a maximum page speed of 40,000 copies / hour, which is not only welcomed by book printing companies, but also by newspaper printing companies. The counting method of this type of page collector is: collecting the pulse signal set at the paper output impeller of the folding machine, the paper hook or paper board is driven by the cylinder or the electromagnet, and the continuous output of the folding folds is pulled out to be empty for stacking. , Generally set to act once every 50 copies, and the pile of folded posts is a stack every 50 copies. Therefore, in order to ensure the accuracy of the number of folds per stack, the print samples taken during the printing process must be quickly replaced, otherwise the accuracy of the number will be affected. At the same time, high-speed printing and thinner or thicker folds also have an effect on the uniformity of the piles. Due to the low cost and economical performance of the page collector, it is still very suitable for book printing presses that are not particularly demanding and do not require high paper path changes for printing speeds and the number of single-fold folding posts.
Development of domestic stacker technology
In recent years, with the large amount of foreign high-end printing equipment imported, the matching stacker dedicated to the collection of folding posts has also begun to enter the Chinese market. Using a stacker for receipt operations increases production efficiency and reduces labor intensity. And because of its own photoelectric counting device, it also has a waste discharge function, making the counting more accurate and reliable. People's eyes have targeted this ascending market, and some domestic manufacturers have begun to develop and manufacture stackers.
The stacker is generally selected separately by the user. Because it has its own drive motor and independent electrical control system, the user only needs to be equipped with a power supply. The drive motor of the stacker tracks the speed of the printing machine through its own speed measuring device. The movement of the paper table lifting and rotating is mostly completed by the air cylinder.
The stacker passes the light reflection of the folding stickers, and the photoelectric counter generates pulses for counting. Since the counter only counts the number of folding stickers actually entering the stacking machine, before the folding stickers do not enter the page collector, no matter how to take the printed samples, or take some The rejection of bad prints will not affect the accuracy of counting. According to the situation of folding posts, the number of posts can be set to 50 or 100 copies.
When the number of folds counted by the counter reaches the set value, the stacking bin will rotate 180 °, so that when the next stack of folds is stacked, it will naturally cross the previous stack of folds by 180 °, and after several such rotations , Paper stacks neatly stacked according to a fixed number of copies will be sent out simultaneously by the pusher. After bundling, it can be issued or bound.
Beiren County was formally established in April 2004. It manufactures and sells stacker equipment in China. The main business is the production of stacking baler and stacker that are compatible with rotary offset presses. The LS-654B stacker used in the newspaper industry is the main model sold in the Chinese market. At present, many users who use Beiren 45A or similar domestic tower printers can choose this type of stacking machine. At the same time, major newspapers such as the Economic Daily, although using imported printers, also chose this type of model. It can be said that domestic manufacturers represented by Beiren County already have considerable technical strength. After continuous technical improvement, Beiren County is the HS-654B high-speed newspaper stacker with a maximum page collection speed of 90,000 copies per hour, and it has the strength to compete with imported equipment.
Of course, due to the difference in printing speed and folding type, the type of stacker is also diverse. For example, for some high-speed printing presses, the selection of the stacking machine should not only consider the maximum delivery speed, but also take into account the maximum stacking height and other factors. On the premise of fully respecting the user's wishes, choose the appropriate stacking machine according to the user's actual situation In order to ensure that the overall performance of high-end domestic printers is not inferior to that of imported printers.
Import stacker application
Previously, because the duty-free standard for domestic imported printing presses was 60,000 copies / hour, large and medium-sized newspapers imported a large number of large and medium-sized printing presses from abroad with a printing speed of 75,000 copies / hour (the double-format machine was called 150,000 copies / hour). For users who use imported printing presses in China, KL550 VARIO PACK stacking machine from German Gömer company is randomly selected.
The pre-collection bin of this stacker can be vibrated longitudinally and laterally, and can be folded together. The lower bin has lifting and rotating functions. The worktable has a print output belt and air nozzle, which is mainly suitable for printing speed of 7.5 Ten thousand copies / hour of commercial or newspaper printing presses.
This type of stacking machine uses a laser counter to count, and gives instructions to the control system to control the operation of the whole machine. The input part of the paper post has a waste discharge port. After the paper feeder automatically picks up the paper, the control system will also instruct the waste discharge port to open when the number of sheets is set by the counting device according to the instructions issued by the paper feeder. , And discharge the folded paper with paper head. At the same time, the photoelectric head is used to detect the regularity of the paper post flow. When the paper post is skewed and the direction of the paper is deviated too much, beyond the level of the paper alignment of the cardboard, the photoelectric head is blocked, and a command will be issued to fold the poster by row. The waste port is discharged.
Nowadays, the world's most advanced newspaper stacking machines mostly use the elevator grille stacking principle to ensure a smaller fall distance for newspapers. This principle is similar to the lifting of the paper table of a sheet-fed printing machine. In this way, the falling distance of the folded post will be effectively controlled, so that when collecting thin newspapers that are seriously affected by the air resistance when falling, it can also ensure that the post is neatly received.
In addition, in order to adapt to high-speed printing, the cycle time of each operation should be shortened as much as possible, that is, the operation cycle should be shortened. Therefore, some stackers use rotary bale discharge technology and a rotating stacker driven by a servo motor to achieve this purpose. In this way, the cycle time of the stacker can be shortened to 1 second. When collecting thick newspapers in this way, even if the number of copies is set to 25 copies and rotate once, it can work normally at a speed of 75,000 copies / hour.
In short, with the technical development of web printing presses, the technical level of the fold collection device is also constantly improving. The user chooses a suitable stacker, although it needs to invest some money at one time, but in the long run, due to the increase in production efficiency and the reduction in the number of operators, the return rate is still very large. Therefore, I believe that with the improvement of people's awareness level, the demand for fold post collection equipment will be further increased, and the market prospect will be brighter.
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