Postpress Technology 1000 (762-775)

762. What are the operating requirements for automatic thread sewing machine threading and threading?
A: (1) The distance traveled by the yarn must be correct and no leakage phenomenon must occur. (2) The pressure on the reel must be appropriate and must not be too tight to avoid pulling the yarn and causing thread breakage or tearing. It should not be too loose to make the yarn of the book after the lock float, the looseness of the book is not tight, or the yarn is formed into a circle bubble, which affects the accuracy of the book thickness and the modeling process of the next process; (3) The swinging amplitude of the lever should be appropriate. Adjust the length required to match the lock line.

763. Automatic thread sewing machine threading work requirements?
Answer: (1) The position of the threading needle and the position of the bottom needle must be accurate; (2) The height of the threading needle must be appropriate, and the threading needle lead should be accurately caught by the hook triangle when it is lowered; (3) Threading needle and hook thread The distance from the tip of the triangle is generally 0.7~1mm. (4) The groove of the hook needle must be smooth, and the hook mouth should not be too large or too small, so as not to cause failures such as unhooked lines and broken wires.

764. What do you mean by the automatic thread locker?
A: It is the position where the signature was sent to the posts. It is the position where the upper and lower posts dropped to the position where the signatures were pressed. When the posts were dropped to contact the signatures, it was exactly the position of the signatures that was more than 50 mm past the center line of the posts. When the tie reaches this position, it is the position of the platen and the sending wheel square in the same straight line. Only three points are on a single line for the smooth transmission of the signature.

765. What are the operating requirements of the automatic sewing machine secant?
A: The sewing machine will idle for one revolution each time it is locked, and will cut the line. Its operation requirements: (1) The secant blade should be kept sharp; (2) The position of the secant blade should be accurate, so that it can be cut through the coil smoothly, and the longer the thread stay, the better.

766. What are the operating requirements for automatic bookbinding machines?
Answer: (1) The pressure on the desk block holder is appropriate, so that the book that can block the lock does not collapse and it is suitable for elasticity; (2) The book that is locked should not be piled up too much. Lift the baffle and unload the book. Immediately after launching the book, the book blocker will block the book that is being locked out so as to avoid inconsistency and inconsistency. (3) Check carefully if there is any disqualification, and if any unqualified product is removed or repaired, there will be (4) It is forbidden to put the mistakes of the matching process to the next process.

767. What are the sewing machine backup tools?
Answer: (1) Large, medium, and small screwdrivers; (2) sleeve wrenches; (3) Hexagon socket wrenches; (4) 14, 17, 19, 22 or movable spanners; stitches (for repairing the original); 5) Scissors.

768. What are the vulnerable parts of the sewing machine?
Answer: (1) threading needle; (2) hook thread needle; (3) under the sender wheel small belt; (4) rubber suction nozzle.

769. What kind of machine is there in the oval package?
Answer: The elliptical bag machine has 3 clips, 4 clips, 5 clips, and 11 clips (clippers) depending on the speed.

770. What is the work process of the elliptical package machine?
Answer: Into the clamp → milling back slot → adhesive glue → stick cover → clamping stereotypes → output received book.

771. What are the operational requirements for the pre-operation of the elliptical package?
Answer: The books in front of the elliptical pack should be bundled with the back of the book, so that the air can be excluded after the bulk posts are tightly bound. The booklet can be molded to ensure the quality of the book.

772. What are the operational requirements for the elliptical package for this machine?
Answer: (1) The distance between the clip board is set according to the thickness of the book block, and the actual thickness of the book block cannot be dropped; (2) The book block placed in the clip board is flat and not skewed. (3) The height of the tray is adjusted correctly according to the book width, and the required width of the exposed sticking and milling back is generally about 10mm; (4) The clip board must be kept clean and the glue is not dirty. (5) When there is inconsistency between the upper and lower thickness of the book block, it is necessary to stick the paper according to the thickness difference to ensure the balance of the book clamping force.

773. What are the operating requirements for the elliptical baled machine's native milling backdraft?
Answer: (1) Under normal circumstances, the back depth is (2 ± 0.5) mm, and the depth of the groove is (1.5 ± 0.5) mm so that the innermost page of the signature can be drilled; (2) Milling Back straight straight not skew, tolerance is less than 0.5mm; (3) milling cutter to keep parallel, milling cutter to keep sharp, milled paper hair, paper scraps should be cleaned, can not be left on the back of the book.
774. What are the operating requirements for the elliptical packaged machine adhesive?
Answer: (1) The EVA hot melt adhesive used should be selected according to the paper quality of the processed book; (2) It must be preheated 2 hours in advance before using the glue, and can be injected into the working glue pot after being warmed up; (3) the glue temperature According to standard technical parameters ± 5 °C, special circumstances allow ± 10 °C; (4) the height of the coating roller and the book back distance should be properly, to be able to glue liquid into the slot, without making the book back adhesive layer stalactite-like hole Prevail; (5) Keep a certain amount of glue in the working glue pan to ensure the uniformity of the rubber roll and glue; (6) The glue liquid in the glue pot can not be continuously and repeatedly heated to prevent aging and clean up on time. Plastic pots, under normal circumstances, pre-cooked pots are cleaned every 3 months, and working pots are cleaned once every two months.

775. What are the operational requirements for the elliptical pack's native cover?
Answer: (1) The cover stock is positioned correctly, the book back should be in the center of the back of the book; (2) The offset of the back cover of the bag cover is based on the back center line of the book, and the thickness tolerance below 25 mm is ≤ 2.5 mm, and the thickness is more than 25 mm. The difference should not exceed 2.5mm; (3) The cover should have a tolerance of ≤ 2mm above and below the back of the book.

Excerpted from ----<Printing Technology>