Frame for sewing upper pillows on covering shells for mattresses, machine for sewing upper pillows on covering shells for mattresses, and method of sewing upper pillows on covering shells for mattresses

Abstract

A frame for sewing upper pillows on covering shells for mattresses, which comprises four perimetric walls; each wall is perpendicular to the two contiguous walls and comprises at least one laminar portion that constitutes a resting surface, the laminar portion being co-planar with a lower edge of the respective wall, at least one of such walls comprising at least one locking element for at least one component, selected from between an upper pillow and a covering shell, arranged on a respective laminar portion.

What is claimed is: 
     
         1 . A frame for sewing upper pillows on covering shells for mattresses, comprising four perimetric walls, each wall being perpendicular to the two contiguous walls and comprising at least one laminar portion that constitutes a resting surface, said laminar portion being co-planar with a lower edge of said wall, at least one of said walls comprising at least one locking element for at least one component, selected from between an upper pillow and a covering shell, arranged on a respective laminar portion. 
     
     
         2 . The frame according to  claim 1 , wherein each wall comprises at least two bands that are mutually aligned and can slide with respect to each other in order to vary the overall length of the wall. 
     
     
         3 . The frame according to  claim 1 , wherein each wall comprises at least two coaxial bars, one inside the other, which can slide telescopically in order to vary the overall length of the wall. 
     
     
         4 . The frame according to  claim 1 , wherein said at least one laminar portion that constitutes a resting surface is extended along the entire length of the respective wall, said laminar portions of said walls defining a lower resting border that lies on the plane that contains the lower edge of said walls. 
     
     
         5 . The frame according to  claim 1 , wherein each one of said walls comprises at least one respective element for locking the at least one component arranged on a respective laminar portion, each said locking element being movable from a free configuration, in which one of its ends is spaced from a respective laminar portion, to a coupling configuration, in which said end faces and is proximate to the respective laminar portion in order to fasten the at least one component, selected from between an upper pillow and a covering shell, which is interposed between them. 
     
     
         6 . A machine for sewing upper pillows on covering shells for mattresses, comprising a supporting structure for at least one coupling frame for upper pillows and covering shells for mattresses, which is associated with respective movement elements that are arranged on said structure, and a guiding track for at least one sewing head, said sewing head being translationally moveable along said track in a direction at right angles to the direction of motion of said frame on said structure, said frame having a substantially rectangular shape and comprising at least one laminar portion that is co-planar with a lower edge thereof, said frame comprising at least one locking element for upper pillows and covering shells for mattresses arranged on the at least one said laminar portion. 
     
     
         7 . The machine according to  claim 6 , wherein said guiding track is arranged substantially at the centerline of said machine, said structure being provided with a respective recess for the passage of the needle of the head up to a respective abutment arranged below said structure. 
     
     
         8 . The machine according to  claim 6 , wherein said movement elements are of the type selected from between belts, preferably of the toothed type, and chains, said movement elements being coupled to at least one respective actuation motor that is controlled by a control and management unit which is also associated with said sewing head for the coordinated movement of the head along the track and of the frame, through the elements, on the structure. 
     
     
         9 . A method for sewing upper pillows on covering shells for mattresses, comprising the steps of:
 arranging a covering shell for mattresses on a coupling frame dimensions and shape of which are complementary to those of said shell, said frame comprising at least one laminar portion that is co-planar with a lower edge thereof;   juxtaposing, on said covering shell accommodated in said frame, a respective upper pillow;   coupling, by means of at least one locking element of said frame, said upper pillow and the respective covering shell for mattresses on the at least one said laminar portion;   aligning said frame, within which said shell and said upper pillow are mutually juxtaposed and accommodated, with a sewing head that surmounts said frame, for the coupling, by way of stitch lines, of said upper pillow and said covering shell.   
     
     
         10 . The method according to  claim 9 , wherein before said step of arranging said shell within said frame there is a step of adjusting the length of the walls of said frame, each wall being constituted by at least two components that can translationally move with respect to each other in order to determine a variation of the overall length of the wall that they define. 
     
     
         11 . The method according to  claim 9 , wherein, following the translational movement of said frame containing said shell and said pillow, and following the sliding of said sewing head along a respective guiding track, said stitch lines have any orientation, shape and/or pattern.