Beiren County is a web offset press stacking device

Domestic early stacker applications

Most web-fed presses use a folded way to page out. What kind of receiving method is used depends on the form of the printed product and the type of printer used.

Most domestic printers use home-made paper and book printing presses for book printing. The earliest domestic book printing presses had speeds of around 2,500 copies/hour. North JJ204 as the main representative models, are equipped with a random horizontal pager. Power is obtained from the folding machine via gears. There is a roller underneath. When it is closed at 8 and 32, it is placed at the side outlet. When it is closed at 16, it can be pushed to the front outlet for operation.

With the advancement of technology, domestic printing equipment manufacturers are no longer producing such old-fashioned books and periodicals printing presses, but instead they are new-generation products with printing speeds of up to 3,600 copies/hour and superior machine performance, such as the Beiren YP890 and YP787 books and periodicals printing presses. . At this point the pager also changed, replaced by an independent motor drive, Beiren company is equipped with a model for the JWS-02 type horizontal pager.

Using the above two types of pagers, functions such as counting of stacks, folding of posts, and discharge of air can be realized. At the same time, since the folds can be turned over to the higher position for receiving posts, the operator does not need to bend over, which can greatly reduce the labor intensity. JWS-02 horizontal type of pager, the maximum speed of up to 40,000 copies / hour, not only welcomed by the printing presses, newspaper printing companies are also a large number of matching. The counting method of this type of pager is: collecting the pulse signal set at the paper ejecting impeller of the folding machine. The cylinder or the electromagnet drives the paper stopping hook or the blocking paper board to pull the continuously output folding frame to empty , generally set to once every 50 actions, the stack of folded notes is a stack of 50 copies. Therefore, to ensure that the number of folded signatures per stack is accurate, the printed samples taken during the printing process must be promptly returned to their original locations, otherwise the accuracy of the quantity will be affected. At the same time, high-speed printing and thin or thick folds also have an effect on the uniformity of the stack. Because the cost of the page-feeding machine is low and relatively economical, it is very suitable for the printing presses, which are not particularly demanding in terms of printing speed, the number of single stacks, and the like, and the paper path change requirements are not high.

Domestic Stacker Technology Development

In recent years, with the large number of foreign high-end printing equipment imported, the matching stackers dedicated to folding collections have also begun to enter the Chinese market. The use of a stacker for receiving posts increases production efficiency and reduces labor intensity. Because of its own photoelectric counting device, it also has a waste discharge function, making the counting more accurate and reliable. People's eyes are aiming at this ascendant market, and some domestic manufacturers have also started to research and develop and manufacture stacking machines.

The stacking machine is generally selected by the user alone. Since it has a drive motor and an independent electrical control system, the user only needs to have a good power supply. The stacker's drive motor tracks the speed of the press through its own speed-measuring device. The movement of the paper table is largely accomplished by the cylinder.

The stacker reflects the light of the signature and counts the pulses generated by the photoelectric counter. Since the counter only counts the number of signatures that actually enter the stacker, no matter how the signature is drawn before the signature does not enter the pager, or The removal of bad prints does not affect the accuracy of the count. Depending on the signature, the number of stacks can be set to 50 or 100 stacks.

When the number of counters counted by the counter reaches the set value, the stacked bins are rotated by 180°, so that when the next stack of folded signatures accumulates, they will naturally cross the stack of folded signatures by 180°, after several such rotations. , Stacks of paper stacked neatly on a fixed number of copies will be sent simultaneously by the putter. Bundles can be issued or bound.

Beiren County was officially established in April 2004. It manufactures and sells stacking equipment in the country, and mainly produces stacking balers and stackers that are matched with web offset presses. The LS-654B stacker used in the newspaper industry is the main model sold in the Chinese market. Many users who use the Beiren 45A or the domestically-made tower-type printers are most likely to have such stackers. At the same time, major newspapers such as the Economic Daily and the use of imported newspapers and newspapers also used this model. It can be said that the domestic manufacturers represented by Beiren County already possess considerable technical strength. After continuous technological improvement, Beiren County is the HS-654B high-speed newspaper stacking machine has reached the highest page rate of 90,000 copies / hour, with the ability to compete with imported equipment.

Of course, due to the difference in printing speed and signature type, the type of stacker is also varied. For example, some high-speed printers need not only to consider the maximum delivery speed, but also to take into account factors such as the maximum stacking height. Under the premise of fully respecting the wishes of users, the appropriate stacker should be selected according to the actual situation of the user. In order to ensure that high-end home-made newspaper in the overall performance is not inferior to the import press.

Import stacker application

Previously, since the domestic import duty-free standard for printing presses was 60,000 copies/hour, large and medium-sized newspapers imported a large number of large and medium-sized newspapers that had a printing speed of 75,000 copies/hour (a double-width machine is known as 150,000 copies/hour). , The domestic users of imported ink jet printers randomly selected Germany's Km550 VARIO PACK stacker.

The pre-collection bin of this stacker can vibrate longitudinally and transversely, and can be folded together. The lower stacker has lifting and rotating functions. The workbench is equipped with a printout belt and an air nozzle, which is mainly suitable for a printing speed of 7.5. Million/hour business or newspaper presses.

This type of stacker uses a laser counter to count, and gives instructions to the control system to control the action of the entire machine. The input portion of the paper post has a waste discharge port. After the paper feeder automatically receives the paper, the control system will also indicate the discharge port according to the instructions given by the paper feed device through the count of the counting device to the set number of sheets. , Discharge the folded paper with the paper head. At the same time, the use of a photoelectric sensor to check the uniformity of the flow of the paper, when the paper frame is skewed to make the paper moving direction deviate too much from the Qi paperboard, the photoelectric head is blocked and commands will be issued. Waste discharge.

Now the world’s more advanced newspaper stacking machines use elevator-type grid stacking principles to ensure that newspapers have smaller distances. The principle is similar to that of the paper table of a sheet-fed printing press. As the number of folding posts increases or decreases, the delivery tray moves up and down. In this way, the fall distance of the signature will be effectively controlled, so that when collecting the thinner newspapers affected by the air resistance at the time of falling, the receipt will be neat.

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 stacking machines use rotary magazine discharge technology and servo motor-driven rotary stacking bins to achieve this goal, thus reducing the cycle time of the stacker to 1 second. When you collect thick newspapers in this way, even if you set the number of copies to 25 rotations, you can work at 75,000 copies/hour.

In short, with the development of the technology of web printing presses, the technical level of signature collection devices is also constantly improving. Although the user chooses the right stacking machine, it needs to invest some money at one time. However, in the long run, due to the improvement of production efficiency and the reduction in the number of operators, the rate of return is still very large. Therefore, I believe that as the level of people's understanding increases, the demand for signature collection equipment will further increase, and the market outlook will become even brighter.

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