The factory purchased a DQ8C saddle stitching linkage line from Shanghai Ziguang Company in 1990. Over the years, this equipment has made great contributions to the production of saddle stitching textbooks for the factory. In order to improve the quality of the finished book processed by the saddle stitching linkage line, the technicians carried out a major overhaul of the equipment, but after the overhaul, the finished book produced by the production line still cannot meet the requirements of high-quality products. Due to the low quality of some varieties of paper, books with more than 6 posts, especially offset paper books and periodicals, when the thickness of the finished product reaches more than 4mm, especially the double-opened book with 32 openings, the finished product has a groove at the front of the book, which is the largest It is over 2.5mm, and the middle knife shrinks and embosses more than 2mm, which seriously affects the quality of the finished book, and even fails to meet the national standard of high-quality books. In order to improve the quality of the finished book, the operator used a single paper cutter to cut off the bevel part of the front bevel book. As a result, the finished product size was less than the standard size of 2mm, which was judged as unqualified by the quality inspection department. For this reason, it caused a loss of more than 100,000 yuan to the factory, which seriously affected the reputation of the factory.
We conducted a research and analysis on the latest type of saddle stitching linkage line of Shanghai Ziguang Company and the saddle stitching linkage line manufactured in Switzerland, and think that the mechanical structure of the three-sided knife on these two linkage lines and our factory DQ8C saddle stitching linkage line three-sided knife They are basically the same with little changes. Even repurchasing the latest equipment will not necessarily solve the above quality problems, and requires more than 1 million yuan in investment. In view of the problems such as the front bevel, middle knife shrinkage and convex sticking of the book cut out by the DQ8C saddle stitching linkage line, we carefully studied the cutting part of the DQ8C three-sided knife. It is believed that after 4 nails are booked by the stapler with more than 6 posts and 32 open double books, the back of the book is arched, which is all pressed by the transmission belt and the brush on the three-sided knife. After the brush is pressed, the book is not in place. , Affecting the quality of the finished book. When the book enters the middle knife cutting position, there is a lot of space on both sides of the middle knife. When the middle knife cuts the book, there is no book presser, which causes the back of the book to be unrealistic and easy to arch. The side knife pressers on both sides first press down and then make the middle The back of the book has a higher arch. After the middle knife cuts the finished book, there are shrinking and protruding posts. After stacking the books, the phenomenon of shrinking and protruding posts is particularly obvious. After the middle knife and the side knife have cut through the book, the book is transferred to the front cutting part through the transmission belt. When the door knife cuts the book, the book is pressed by the transmission belt and the brush. More than 6 books are booked by the stapler After passing the nail, the belt and brush alone cannot be pressed at all. If the brush is adjusted too tightly, the book is not in place.
Therefore, we added two sets of book presses on both sides of the reciprocating cutter blade holder of the middle knife to ensure that when the three-sided knife is cutting the book, the book pressers on both sides of the middle knife first pressed the book to make it flat and not bow When the book is cut, the book is not loose. The specific method is: remove the knife holder of the middle knife, and use the plane above the knife holder as the reference on the planer, plan out the vertical plane with a width of 60mm on both sides of the extended part of the knife holder (knife mounting section) to ensure the pressure The verticality of the cutting device is the same as that of the middle knife. A group of two sides of the middle knife are fixed with screws. After adjusting the position, the positioning pin hole is punched and the positioning pin is installed to ensure easy assembly and disassembly. The book presser goes up and down with the middle knife during work. The book presser first presses the signature, then the middle knife cuts the book. After adjusting the positioning of the book press once, there is no need to adjust. The middle knife presser is composed of guide bracket, guide rod, left and right pressure block, spring, nut and so on.
The door knife book press is installed on the reciprocating lifting seat of the door knife, and the arch extends outward. When working, the book presser first presses the back of the book, then the front part presser presses the book again, so that when the book is cut on the front of the three sides of the book, the back of the book is uniform, not bowed, to ensure that the cut front of the book is not slope. Then, the concave parts on both sides of the book-feeding bottom plate of the door knife are milled into a long slot with a width of 25 mm and a depth of 8 mm on the milling machine, and two book-holding boards are installed to ensure that the sides of the book do not sag when the book presser is pressed down, causing a groove. When installing, adjust the book presser at the front mouth first, and then adjust the book presser at the back of the book. The book-presser at the back of the book is 3 to 4 mm lower than the book-presser at the front mouth. Make sure the back of the book is compacted first, and then the front mouth is compacted. The book-presser at the back of the book moves up and down with the book-presser at the front mouth. After one-time positioning adjustment, no further adjustment is needed. The book presser at the back of the book is composed of a fixed bar, a short pressing block, a pressing block, a guide rod, a guide bracket, a spring, a nut, a pin, a support, and a screw.
More than a month of production practice has proved that after adding a book presser, the quality problems of the front mouth bevel, middle knife shrink and convex stickers are solved, the quality of the finished book is improved, and a guarantee is provided for the production of high-quality riding book .
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