Shuttle Hook Sewing Machine / Grajfer Šivaće Mašine / Sewing Machine Hook

The theme, then, is the shuttle hook (German: greifer nähmaschinen), the upper thread hook, or the loop; an inexhaustible topic when it comes to sewing machines, the term "grapple / hook " is most often used. Mostly in this post, we will talk about the grapple on industrial machines, on home machines the grapple is something different and in principle a simpler construction, read something about it HERE.

Tema je dakle, grajfer (njemački: greifer nähmaschinen), hvatač gornjeg konca ili petljač; neiscrpna tema kada su u pitanju šivace masine, najčešce se koristi termin "grajfer". Uglavno u ovom postu će biti riječi o grajferu na industrijskim mašinama, na kućnim masinama grajfer je nešto drugačije i u principu jednostavnije konstrukcije, nešto o tome pročitaj OVDE.

The shuttle hook is one of the most important elements when it comes to the quality of the machine stitch. His work is unknown to many, but in principle it is a "simple" assembly.-loop. The shuttle hook could be divided into oscillating and rotating.

The oscillating hook could be shown as a constant work "back and forth", the oscillating hook is usually on older machines, often on home, on sewing machines for heavy materials, where no speed is required, although there are exceptions, say "bernina" it generally has an oscillating shuttle hook and can run at high speeds, true solved in a slightly different way. The rotary shuttle hook has some advantages, how to describe it, its movement is always in one direction, constant rotation.

With the rotating hook (sew hook), significantly higher sewing speeds are achieved with very good stitch quality, which is easier to maintain. Rotary type shuttle hook in modern machines also have the definition of a "cutter" that cuts each thread that falls between the two surfaces and prevents stagnation. Next would be the position of the shuttle hook in relation to the machine, I would divide them into horizontal and vertical. With a horizontal shuttle hook, the spool approach is simple, the spool is clearly visible, the vertically placed hook is most common with high-speed machines, the spool access is somewhat more difficult, conditionally speaking. Mostly modern industrial machines have vertical grabs. The shuttle hook can be damaged during operation, it can happen for many reasons, for example one of them is a strong blow to the tip of a thicker needle that can significantly damage the grapple, in the worst case it can break off a piece of it. Every grip on the hook and its correct adjustment really requires an experienced master, that I don't know what kind of machine if the hook is not, as I say "brought into phase", that machine will not sewing, or the stitch will be useless

Grajfer je jedan od najbitnijih elemenata kada je u pitanju kvalitet mašinskog štepa. Njegov rad je za mnoge nepoznanica ali u principu se radi o "jednostavnom" sklopu, grajfer pri radu-okretanju zahvata jednim svojim dijelom u obliku kuke (hook) gornji konac (igleni), povezuje ga sa donjim koncem i uz pomoc određenih zatezača formira bod-petlju. Grajfer (petljač) bi se mogao podijeliti na oscilirajući i rotacioni (rotirajući).Oscilirajuci grajfer bi se mogao prikazati kao konstantan rad "naprijed-nazad", oscilirajuci grajfer je obično na starijim masinama, često na kućnim, na šivaćim mašinama za teške materijale, gdje se ne zahtijeva neka brzina, mada ima i izuzetaka, recimo "bernina" uglavnom ima oscilirajući grajfer i može raditi na velikim brzinama, istina riješen na nešto drugačiji način. Rotacioni grajfer ima nekih prednosti, kako njega opisati, njegovo kretanje je uvijek u jednom smijeru, konstantna rotacija. Kod rotirajuceg grajfera se postižu znacajno veće brzine šivenja uz vrlodobar kvalitet štepa, održavanje mu je jednostavnije. Grajferi rotirajuceg tipa kod savremenih masina imaju u sebi i odredenje "rezače" koji svaki konac koji dospije medu dvije površine siječe i sprečava zastoj. Sledaće bi bilo pozicija grajfera u odnosu na stroj-mašinu, ja bi ih podijelio na horizontalni i vertikalni. Kod horizontalnog grajfera pristup bobini-špulni je jednostavan, špulna se jasno vidi, vertikalno postavljeni grajfer je najčešce kod mašina sa velikim brzinama, pristup špulni je nešto teži, uvjetno kazano. Uglavnom savremeni industrijski strojevi imaju vertikalne grajfere. Grajfer-petljač pri radu može da se ošteti, to se može desiti iz dosta razloga, recimo jedan od njih je i snažan udarac vrha deblje igle koja može znacajno da ošteti grajfer, u najgorem slučaju može da se i odlomi komadic istog. Svaki zahvat na grajferu i njegovo pravilno podešavanje stvarno traži iskusnog majstora, da je neznam kakav stroj ako grajfer nije, kako ja kažem"doveden u fazu" ta masina prošiti neće, ili će štep biti beskoristan.

Sometimes it happens that the screws holding the shuttle hook on the shaft loosen completely or partially and there is a complete stoppage in the operation of the machine, where the shuttle hook remains completely unadjusted and in the worst case completely immobile (the sleeve rotates freely in it). The hook consists of a movable and stable part, the parts are tied with very fine screws and damage to any part creates a problem. All surfaces on the shuttle hook must be smooth "like glass". 

What can be done freely is occasionally thorough cleaning of the loop-hook from the remnants of thread, accumulated dust, etc. (preferably with compressed air from all sides, who has), and then add a few drops of original sewing machine oil to the shuttle hook and start the machine that the oil spills nicely. Of course, more serious work on the hook should be left to a professional, such as Me (a little self-praise is not out of the question. 

Many "masters" use the situation and often know how to declare the shuttle hook defective and its price is not small). that it is unusable, in industrial sewing machines the shuttle hook is made of very high quality material and is quite durable, the masters install a new shuttle hook and still leave a "defective" one which is solidly cashed, if a piece of hook is broken then there is no help and if part of the shuttle hook is furrowed , this can sometimes be solved, with home sewing machines the grapple-loop is in principle "simpler", although even newer home machines have a complex grapple.This topic is extensive and will be discussed in addition to this text or in some other topics ... 

Detailed instructions for tuning - adjusting the shuttle hook can be found HERE

Ponekad se desi da vijci koji drže grajfer na osovini popuste u potpunosti ili djelimično i da dođe do potpunog zastoja u radu mašine, gdje grajfer ostane potpuno nepodešen a u najgorem slučaju i potpuno nepokretan (rukavac se slobodno vrti u njemu). Grajfer se sastoji iz pokretnog i stabilnog dijela, dijelovi su vezani veoma sitnim vijcima a oštećenje bilo kojeg dijela stvara problem. Sve površine na grajferu moraju biti glatke "kao staklo". Ono što se može slobodno uraditi je povremeno detaljno čišćenje petljača-grajfera od ostataka konca, nakupljene prašine i sl, (najbolje zrakom pod pritiskom sa svih strana, ko ima) a poslije toga dodati u grajfer nekoliko kapi originalnog ulja za šivaće mašine i pokrenuti stroj da se ulje lijepo razlije. Naravno ozbiljnije radove oko grajfera treba prepustiti strucnoj osobi, kao recimoo MENI (malo samohvale nije na odmet ☺☺. Mnogi "majstori" koriste situaciju i često znaju proglasiti grajfer neispravnim a njegova cijena nije mala (zavisi od masine), u suštini grajfer rijetko strada da je neupotrebljiv, kod industrijskih šivaćih mašina grajfer je izrađen od veoma kvalitetnog materijala i prilično je dugotrajn, majstori ugrade novi grajfer a sebi još ostave "neispravan" koji solidno unovče, ako je komadić grajfera odlomljen onda mu nema pomoći a ako je dio grajfera izbrazdan, to se ponekada može riješiti, kod kućnih šivaćih mašina grajfer-petljač je u principu "jednostavniji", mada već i novije kućne mašine imaju složeni grajfer. Ova tema je opširna i o njoj ce biti još rijeci ili kao dodatak na ovaj text ili u okviru neke druge teme.....Detaljno uputstvo za štelovanje - podešavanje grajfera možete pogledajte OVDE