Magnetically induced coupling and drive apparatus

A magnetically induced coupling and drive apparatus useful for conveying webs, comprising:

• a first rotatable element having a first magnetic core;
• a first bonding layer at least partially surrounding and bonded to said first magnetic core;
• a first layer at least partially surrounding and bonded to said first bonding layer, said first layer comprising a corrosion resistant material;
• a second bonding layer at least partially surrounding and bonded to said first layer;
• a second layer at least partially surrounding and bonded to said second bonding layer, said second layer comprising a wear and abrasion resistant material;
• and,
• a second rotatable element having a second magnetic core for magnetically coupling with said first magnetic core of said first rotatable element;
• said second rotatable element further having a third bonding layer at least partially surrounding and bonded to said second magnetic core;
• a third layer at least partially surrounding and bonded to said third bonding layer, said third layer comprising said corrosion resistant material;
• a fourth bonding layer at least partially surrounding and bonded to said third layer;
• a fourth layer at least partially surrounding and bonded to said fourth bonding layer, said fourth layer comprising said wear and abrasion resistant material;
• a frame for supporting said first rotatable element in a magnetic coupled relations with said second rotatable element, said first and second elements supported in said frame having a substantially uniform nip width therebetween for conveying a contacting web therethrough;
• and,
• means for rotating one of said first and second rotatable elements, said means comprising a ferromagnetic stator member integrally associated with one of said first and second rotatable elements, said ferromagnetic stator member having a plurality of spatially separated pole teeth, each of said pole teeth having an operably connected coil arranged for producing rotation of one of said first and second rotatable elements, said coils being energized by a source of energy,
• wherein a rotation of either one of said first and second rotatable elements causes rotation of the other one of said first and second magnetic cores corresponding to said either one of said first and second rotatable elements in said magnetically coupled relations, said rotation simultaneously causes a synchronous rotation of the other one of said first and second rotatable elements.