In the ordinary flat lock, a threading needle, a threading hook and a hook needle form a group to complete the thread locking process. After the book signature enters the thread-locking position during work, the bottom needle 3 moves upwards, punching all the staple holes from the inside to the outside along the crease of the signature. Then the threading needle 4 and the hooking needle 5 move downward together, so that the threading needle and the hooking needle thread the thread into the signature from the corresponding fixing holes, and at the same time, the bottom needle retracts. The pulling hook claw 1 moves from left to right, pulls the yarn sleeve into double strands, and feeds the yarn into the hook groove of the hook needle. Then the claws return to their original positions. Then the threading needle and the crochet needle are driven back up at the same time. At this time, the yarn hooked by the crochet needle wraps around a hook outside the signature and returns to its original position as shown in Figure 143f. This completes the thread-locking process of a book.
The thread-locking process of the second signature is basically the same as that of the first signature, except that the clasp that the hook needle hooks out of the second signature is nested in the clasp of the first signature, so that one set forms a chain of chains one by one. Until a book is locked. When the thread lock of a book is finished, let the machine run idle once. At this time, the coil hooked out in the last post is also beaten to stay outside the book post, and the thread is cut off to form a book core.
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