Industrial Sewing Machine Class / Industrijska Šivaća Mašina Klase

The word "class" itself is somehow interesting, where does that prefix with "industrial sewing machine" come from ?? Many change the serial number with the class of the machine, it has nothing to do with each other, although the serial number of some models can determine which class of machine it is, for example, older Singer sewing machines.
Class is a foreign word, but it has become a standard in our country, it could be "roughly" translated as a "category" of sewing machines. It originates from the German word "Klasse nähmaschinen" or the English "class sewing machines".
Sama riječ "klasa" nekako je zanimljiva, od kud taj prefiks uz "industrijska šivaća mašina"??
Mnogi mijenjaju serijski broj sa klasom mašine, to nema veze jedno s drugim, mada se po serijskom broju kod nekih modela može odrediti o kojoj je klasi mašine riječ, recimo kod starijih Singer šivaćih mašina. Klasa je strana riječ ali je se kod nas ustalila kao neki standard, ona bi se mogla "grubo"prevesti kao "kategorija" šivaće mašine. Porijeklo vodi od njemačke riječi "Klasse nähmaschinen" ili engleski "class sewing machines".

Bernina 540 Favorit / Vintage Bernina / Bernina Favorit 540

This Bernine model is specific in many ways, first of all it is most likely a small series of Bernine, a rare model or the owners are reluctant to sell it, it is certain that they have a reason.
Namely, this model is designed for medium-heavy working conditions, some call such machines "semi-industrial", the construction is as massive as all parts, the drive pulley (flywheel) is larger in diameter and weight, it is made of cast iron with plastic coating. The first interesting thing is the drive of the machine, it is not done classically using ...