Two-sided single-needle under-thread stitching process
A needle guide, sandwich structure technology, applied in the direction of high-efficiency propulsion technology, air transportation, application, etc., can solve problems such as expanding sewing threads, and achieve the effect of eliminating the cutting process to length
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[0031] A hook, clip or needle (clamping system) 1 together with reinforcing material 3 such as sewing thread or roving can be used to reinforce the sandwich structure (Fig. I).
[0032]The hook, clip or needle 1 together with the reinforcing material 3 is guided to the next piercing point during a simultaneous 180° swivel movement (Figures I and II). If the hook, needle or clip is fixed to a slider, the rotational movement may be foregone.
[0033] Hooks, clips, needles 1 are used to introduce a through hole into the core material 2 or if necessary through one or more skin and core materials (Figure III). At this time, the reinforcing material is not carried. The reinforcing material slides past the hooks, pins or clips (Fig. IV) and remains on the upper surface of the core material.
[0034] Needles, hooks or clips take the reinforcement from below, which is then introduced into the sandwich structure by an upward and rotational movement (Fig. IV). If the hook, needle or c...
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