Winding machine with automatic introduction of reinforcing sheet

Abstract

A device is for automatically introducing a reinforcing sheet into a coreless coil applicable to a coreless winding machine. The winding machine includes such a device. In particular, a device is for introducing a reinforcing paper sheet into a coreless roll being wound with a continuous strip material by a coreless winding machine. The device includes a feeding tray for paper sheets, a feeder of the paper sheets taken from the feeding tray, and an introduction member of a paper sheet loaded into a roll being wound in the winding machine.

1 . A device for introducing a reinforcing paper sheet into a coreless roll being wound with a continuous strip material by a coreless winding machine, comprising:
 a feeding tray for paper sheets;   a feeder of the paper sheets taken from the feeding tray;   an introduction member of a paper sheet loaded into a roll being wound in said winding machine.   
     
     
         2 . The device according to  claim 1 , wherein the introduction member of the sheet comprises a first conveyor member and a second conveyor member placed in sequence along an inclined path, wherein the first conveyor member is inclined with a gradient less than a gradient of the second conveyor member. 
     
     
         3 . The device according to  claim 2 , wherein both the first and second conveyor members comprise conveyor belts wound about pulleys supported on shafts rotating by independent drives, wherein the drive of the second conveyor member is configured to operate at a speed to move the sheet homokinetically with respect to a winding speed of the roll. 
     
     
         4 . The device according to  claim 2 , wherein the first conveyor member comprises a series of idle rollers arranged at one end of respective arms hinged onto support bars to form gravity pressing means for the paper sheets. 
     
     
         5 . The device according to  claim 2 , wherein the second conveyor member comprises a belt presser placed above the conveyor belts and comprising belts wound about pulleys supported idly on shafts. 
     
     
         6 . The device according to  claim 2 , wherein the second conveyor member comprises a proximal end with respect to the first conveyor member and a distal end, wherein said distal end is associated with a guide member for the sheet arranged in a substantially vertical position and comprising a shaft which supports idle pulleys, a drive belt being wound on said pulleys and on corresponding pulleys supported idly on a shaft arranged at the distal end of the second conveyor member. 
     
     
         7 . The device according to  claim 1 , wherein the feeding tray comprises containment edges and an open bottom placed above a proximal end of the feeder, wherein the containment edge placed straddling the feeder ends proximate a gripping surface of the feeder without coming into contact with the feeder, to allow the paper sheet to be singularized and taken from a stack of sheets from below. 
     
     
         8 . The device according to  claim 1 , wherein the feeder comprises an ascending belt system running about motorized pulleys and idle pulleys, wherein the belt system changes the gradient thereof proximate a distal end of the feeder, forming a substantially horizontal segment. 
     
     
         9 . The device according to  claim 8 , wherein a plurality of idle rollers is placed above the belt system, at one end of respective arms hinged onto support bars to form gravity pressing means for the paper sheets transiting on the feeder. 
     
     
         10 . A coreless-type winding machine comprising a device according to  claim 1 , wherein said winding machine comprises:
 a coil-holder roller which rotationally supports a coil of continuous strip material;   a first motorized drive roller and a second motorized drive roller, wherein the second drive roller is coupled to a pressing roller so that the continuous strip material passes between said two rollers;   a plurality of motorized winding mandrels, placed on a revolver member, said revolver member being discontinuously rotatable, to present a different winding mandrel from time to time at the second drive roller;   wherein the guide member of the second conveyor member of the device ends above a contact point between the second drive roller and the winding mandrel of the roll being wound; and   wherein said winding mandrels have, along a cylindrical surface thereof, fixed circular arc sectors alternating with retractable circular arc sectors, which form a cylindrical surface during the step of winding to form the roll and retract radially during the step of extracting the roll.   
     
     
         11 . A method of winding a coreless roll of a continuous strip material comprising the steps of:
 providing a winding machine for coreless rolls of said continuous strip material;   winding on a mandrel of said winding machine a first set of turns of said continuous strip material;   introducing a reinforcing paper sheet into said winding roll while winding a second set of turns;   singularizing a roll formed.   
     
     
         12 . The method according to  claim 10 , comprising the step of providing a coreless winding machine comprising a device for introducing a paper sheet into a coreless roll being wound with a continuous strip material by a coreless winding machine, the device comprising:
 a feeding tray for paper sheets,   a feeder of the paper sheets taken from the feeding tray,   an introduction member of a paper sheet loaded into a roll being wound in said winding machine.   
     
     
         13 . A coreless roll of a continuous strip material, comprising a central hole surrounded by a first set of turns of said continuous strip material and a second set of turns of said continuous strip material, wherein the first set of turns comprises a smaller number of turns than the second set of turns, and wherein a paper sheet is placed between the first set of turns and the second set of turns. 
     
     
         14 . The roll according to  claim 13 , wherein the wound paper sheet protrudes from two axial ends of the roll. 
     
     
         15 . The roll according to  claim 13 , wherein the paper sheet comprises information, including advertising lettering, recipes, or contest indications. 
     
     
         16 . The device according to  claim 1 , wherein the introduction member of the sheet comprises a first conveyor member and a second conveyor member placed in sequence along an inclined path, wherein the first conveyor member is inclined with a gradient less than the second conveyor member, and wherein an angle formed by the plane of the second conveyor member with respect to a horizontal plane is greater than 45°. 
     
     
         17 . The device according to  claim 1 , wherein the introduction member of the sheet comprises a first conveyor member and a second conveyor member placed in sequence along an inclined path, wherein the first conveyor member is inclined with a gradient less than the second conveyor member, and wherein an angle formed by the plane of the second conveyor member with respect to a horizontal plane is greater than or equal to 70°. 
     
     
         18 . A coreless roll of a continuous strip material, comprising food grade aluminum or alloys thereof or food grade paper, comprising a central hole surrounded by a first set of turns of said continuous strip material and a second set of turns of said continuous strip material, wherein the first set of turns comprises a smaller number of turns than the second set of turns and comprises between 1 and 9 turns, and wherein a paper sheet is placed between the first set of turns and the second set of turns. 
     
     
         19 . The roll according to  claim 13 , wherein the wound paper sheet protrudes from two axial ends of the roll by 2-7 mm.