DE697517C - Method for separating the connecting threads between two adjacent book blocks in book stitching machines - Google Patents

Description

Method for teasing the connecting threads between two adjacent ones Book blocks in saddle stitching machines The invention relates to a method to separate the connecting threads between two. neighboring book blocks in saddle stitching machines according to patent 65 5 682, in which the connecting threads to be separated by a catching organ bent out of the needle track. and independently in advance of further assistance with a cutting device. be merged. -.

For further development of the process according to the main patent, there is Invention'darin that the piece of thread to be cut from the swinging hook trained catching organ in a manner known per se from the needle track or the stapling area pulled out while approaching the cutting element in loop form and in this Position is held until the cutting element in any, expediently later by a separate control with the counter knife acting as h Catch organ is brought together, so that the drawn piece of thread is cut off will.

The thread caught by the holder remains until it is cut lie quietly, no matter how many layers after catching and before cutting still to be stapled.

While the process according to the main patent is primarily for separating the cutting thread from the loop hanging in the hook needle is suitable, The present development of this method is preferably for segregation »Of the cutting thread on the sewing needle.

Previously known was z. B. by -the patent 544083 the segregation of the thread to be cut on a guide element on which the thread with the gradually wandered backwards-sliding books to a knife and at it was cut ..

The secretion by a secretion organ that shifts laterally parallel to the spine of the book was also known (French patent 720 365), on which the loop also gradually migrated to a wedge-shaped knife.

In contrast, the novelty and progress of the invention consists in that the wandering behind the. separated thread and a very specific one, " however, any point in time for cutting is adhered to. In the exemplary embodiment selected arrangement of the separation and cutting organs in front of the stapling point offers also the advantage of good accessibility and the possibility of monitoring all parts.

The Zurseiteschwingen -des catching organ can, as soon as it z. B. to that is. Sewing on back material is so big to be made. that the for it required lateral movement the needles remove the thread from the catching organ can not slip off.

For the invention it is unimportant whether a stapling system with uniform stapled layers, d. H. one in which the naeli threads are attached to the same in every position Place lee. gen, is chosen or one in which the stitching threads alternate are offset. It is also irrelevant whether the stitching is double threads or simple in any position and whether the catching of the threads to be cut takes place on the sewing needle or a hook needle used for basting. In the latter Trap becomes the. The thread hook does not grasp both threads, but only one, i.e. in step in the eyelet and hold it.

In the drawing is the new method of catching the cutting lines shown in one embodiment, namely a stapling system is selected in which Sewing and hook needles are used, and the thread catcher is on the sewing needle appropriate. But it could also stand in front of the hook needle with the same success.

The drawing only shows the mechanisms necessary for actuation; in particular, all parts that do not belong to it have been omitted. It shows: Fig. I the cross section through the stapling mechanism at the sewing point, Fig.2 to q. the different Phases when pulling the thread, catching and cutting, Fig. 5 to 8 the associated needle positions and Figs. 9 to 13 show the gripping and cutting mechanism in connection with the stapled Positions of the books.

During normal stapling in a known manner is the hook i, which is somewhere, e.g. B. on the needle bar (Fig. I), stored can and receives its drive on it, to the side of the needle (Fig. 2, 5, 9), like this that the stapling can take place unhindered. When a book is finished, it becomes by any impulse from outside the hook i is moved to the left (Fig. 3, 6 and i o). In doing so, @er grasps the sewing or chain thread and pushes it to the side (Fig: -. Io). In this position he can be ge% old as long as desired, so that z. B. at the beginning of the next book, when the needles stick in the first layer, the A thread hangs over it like an eyelet (Fig. I i to 12). Either the hook i will now by an additional movement, as shown, rotated further and the thread thereby to knife 2 (Fig. 8 bit 12), or the Knife 2 towards the thread. Instead of the oscillating movement shown, the could Holder or the knife also = pushed to the side or in a special way He moves appropriately, including the empty stitch that is required with some stitching systems between two books can be produced unhindered (Fig. 11 to 13). Since that Cutting off the thread is not tied to any time, any number of new layers can be created after catching the thread, before the knife starts to work. This is the case with stitching systems with stitching threads offset inside the layer. important; if the end sewing needles are operated alternately (Fig. 13). If with a such stitching the cutting on the sewing needle takes place too early, z. B. at or after the next layer has been sewn, the caught thread still hangs unsecured in the needle and, if cut too early, can jump out of its eye and make stitching impossible. Here, if you don't prefer, in this one If catching the chain loop, the cutting only takes place during or after completion stapling in the third position. With other stapling systems this is To apply the procedure accordingly.

The drawing contains only those necessary for the present procedure Parts; but from Fig. i their connection with the book sewing machine can be seen.

Claims (1)

PATENT CLAIM; Process for separating connecting threads between two adjacent book blocks in saddle stitching machines according to patent 655 682 where the connecting threads to be separated are bent out of the needle path by a catching element and can be merged with a cutting device independently of further stapling, characterized in that the piece of thread to be cut is different from the one that is vibrating Hook-shaped catching organ (i) in a manner known per se from the needle track or pulled out from the stapling area while approaching the cutting element (2) in a loop shape and is held in this gap until the cutting element (2) is in any expediently later by a separate control with the as Counter knife acting catching organ (i) is brought together so that the pulled out Piece of thread is cut.