Device for joining by calendering at least one sheet of glass and at least one film of plastic material

A calendering device comprising:

• a frame;
• a plurality of pressure rollers mounted side-by-side in first direction;
• a plurality of counterpressure rollers mounted side-by-side in said first direction, each of said counterpressure rollers being positioned for cooperation with one of said pressure [rollres] rollers to form a plurality of pairs of cooperating pressure and counterpressure rollers;
• piston rod means for separately supporting each of said pressure rollers and counterpressure rollers;
• means for moving each said piston rod means in a second direction so that said rollers of each said pair of rollers move toward one another to calender a product therebetween, said means for moving comprising:
• (a) at least one pair of first and second fixed fluid tight casings fixed to said frame,
• (b) an elastic diaphragm for each said fixed casing tightly dividing each said fixed casing into two portions,
• (c) means for supplying pressurized fluid to one of said two portions of each said fixed casing,
• (d) [a plurality of pistons] at least one piston in the other of said two portions of each said fixed casing, [all of said pistons] said at least one piston in each said first fixed casing being fixed to said piston rod means of said pressure rollers and engaging said diaphragm in said first fixed casing such that movement of said diaphragm due to fluid pressure in said one of said two portions of said first fixed casing presses [all of said pistons] said at least one piston in each said first fixed casing to move a corresponding pressure roller in said second direction, wherein [all of said pistons] said at least one piston in each said second fixed casing [are] is fixed to said piston rod means of said counterpressure rollers and [engage] engages said diaphragm in said second fixed casing such that movement of said diaphragm due to fluid pressure in said one of said portions of said second fixed casing presses [all of said pistons] said at least one piston in each said second fixed casing to move a corresponding counterpressure roller in said second direction,
• wherein said [piston] pistons are spaced from any walls of said at least one fixed casing;
• [and] means for compensating for movements of said rollers and piston rod means due to the weight thereof, means for equalizing the pressure between said diaphragms , and
• ball guide sleeve means for guiding movement of said at least one piston with low friction,
• wherein said pressure rollers are positioned above said counterpressure rollers, and wherein for said pressure rollers the means for supplying pressurized fluid supplies the pressurized fluid to only an upper one of said portions of each said casings.