Device for longitudinal cutting of a continuous web material, such as corrugated cardboard

Abstract

The device comprises a path for the web material (N) and, along said path, at least one cutting unit ( 7 A). The cutting unit comprises: a plurality of intermediate disk-shaped blades ( 9 A) disposed on one side of the feed path of the material, which can be positioned transversely to the direction of feed and cooperating with a fixed counter-blade ( 33 A) disposed on the opposite side of said path. Also provided are two lateral disk-shaped blades ( 10 A) to cut the trimmings; and a member for transverse positioning of the blades. The two lateral blades each cooperate with a respective movable counter-blade ( 71 A), separate from the fixed counter-blade, which can be positioned transversely to the direction of feed of the web material.

1 . A device for longitudinal cutting of a continuous web material, comprising a path for the web material and, along said path, at least one cutting unit comprising: a plurality of intermediate blades disposed on one side of said path, which can be positioned transversely to the direction of feed of the web material and cooperating with a fixed counter-blade disposed on the opposite side of said path; at least two lateral blades to cut the trimmings; and a member for transverse positioning of said blades; wherein said two lateral blades each cooperate with a respective movable counter-blade, separate from said fixed counter-blade, and which can be positioned transversely to the direction of feed of the web material.  
     
     
         2 . Device as claimed in  claim 1 , wherein said lateral blades are produced and disposed to be disengaged from the web material and engaged in the web material in concurrence with order changes.  
     
     
         3 . Device as claimed in  claim 1 , wherein each of said movable counter-blades is connected to the respective lateral blade and movable jointly therewith to be positioned together with the blade transversely to the direction of feed of the web material.  
     
     
         4 . Device as claimed in  claim 2 , wherein each of said movable counter-blades is connected to the respective lateral blade and movable jointly therewith to be positioned together with the blade transversely to the direction of feed of the web material.  
     
     
         5 . Device as claimed in  claim 1 , wherein said fixed counter-blade comprises a fixed rectilinear element extending transversely to the direction of feed of the web material for a substantial part of the useful width of the device.  
     
     
         6 . Device as claimed in  claim 2 , wherein said fixed counter-blade comprises a fixed rectilinear element extending transversely to the direction of feed of the web material for a substantial part of the useful width of the device.  
     
     
         7 . Device as claimed in  claim 3 , wherein said fixed counter-blade comprises a fixed rectilinear element extending transversely to the direction of feed of the web material for a substantial part of the useful width of the device.  
     
     
         8 . Device as claimed in  claim 5 , wherein said rectilinear element comprises a metal bar and an interchangeable block made of a plastic material.  
     
     
         9 . Device as claimed in  claim 8 , wherein said metal bar and said interchangeable block form a flat supporting and sliding surface for the web material.  
     
     
         10 . Device as claimed in  claim 8 , wherein said metal bar is produced on a section bar integral with a base plate, said section bar and said base plate forming a channel to house said interchangeable block.  
     
     
         11 . Device as claimed in  claim 8 , wherein said interchangeable block is produced of a plurality of sections aligned along the extension of the counter-blade.  
     
     
         12 . Device as claimed in  claim 1 , wherein the axes of rotation of said lateral blades are staggered with respect to the axes of rotation of the intermediate blades along the direction of feed of the web material.  
     
     
         13 . Device as claimed in  claim 1 , wherein each of said lateral blades and of said intermediate blades is carried by a respective slide movable along a transverse guide.  
     
     
         14 . Device as claimed in  claim 1 , wherein each of said movable counter-blades is carried by a shoe sliding transversely to the direction of feed of the web material.  
     
     
         15 . Device as claimed in  claim 14 , wherein the shoes which carry the movable counter-blades slide along the transverse guide on which the slides carrying the lateral blades and the intermediate blades slide.  
     
     
         16 . Device as claimed in  claim 14 , wherein the shoe of each of said movable counter-blades is connected to the slide carrying the corresponding lateral blade.  
     
     
         17 . Device as claimed in  claim 16 , wherein said shoe and said slide are connected by a system which allows adjustment of the relative distance between shoe and slide.  
     
     
         18 . Device as claimed in  claim 17 , wherein said shoe and said slide are connected reciprocally by a threaded bar.  
     
     
         19 . Device as claimed in  claim 14 , wherein each movable counter-blade is connected to the respective shoe by an upright and a cross member parallel to the direction of transverse translation of the counter-blade, the upright being distanced laterally from the cutting surface of the respective lateral blade.  
     
     
         20 . Device as claimed in  claim 1 , wherein said movable counter-blades are disposed downstream of the fixed counter-blade with respect to the direction of feed of the web material.  
     
     
         21 . Device as claimed in  claim 1 , wherein each of said movable counter-blades comprises a pair of adjacent supports, defining a slot inside which the respective lateral blade penetrates.  
     
     
         22 . Device as claimed in  claim 21 , wherein said supports are elastically stressed against the sides of the respective lateral blade.  
     
     
         23 . Device as claimed in  claim 1 , wherein the fixed counter-blade is carried by an oscillating support, to take an inoperative position distanced from the path of the web material.  
     
     
         24 . Device as claimed in  claim 1 , wherein each of said intermediate blades and of said lateral blades is carried by a movable arm, controlled by a respective actuator, to be carried alternately to an operating position or to an inoperative position.  
     
     
         25 . Device as claimed in  claim 24 , wherein the movable arms carrying said intermediate blades and said lateral blades are oscillating arms.  
     
     
         26 . Device as claimed in  claim 24 , wherein the arms carrying the intermediate blades and the arms carrying the corresponding lateral blades are oscillating about a common axis.  
     
     
         27 . Device as claimed in  claim 1 , including at least two cutting units disposed along the feed path of the web material, each comprising said intermediate blades cooperating with a fixed counter-blade and a respective pair of said lateral blades with the respective movable counter-blades.  
     
     
         28 . Device as claimed in  claim 17 , wherein said cross-member carries two fixed counter-blades cooperating with the cutting blades of said two units.  
     
     
         29 . Device as claimed in  claim 28 , wherein said cross-member is produced in two portions hinged about an axis approximately parallel to said fixed counter-blades, to move the respective fixed counter-blade away from the web material when the respective blades are inoperative.  
     
     
         30 . Device as claimed in  claim 27 , wherein the lateral blades of each of said cutting units are disposed to act adjacent to the corresponding intermediate blades.  
     
     
         31 . Device as claimed in  claim 1 , wherein said blades are positioned under the feed path of the web material, said path being essentially horizontal.  
     
     
         32 . Device as claimed in  claim 1 , including one or more scoring units disposed along the feed path of the web material.  
     
     
         33 . Device as claimed in  claim 1 , wherein said blades are disposed under the feed path of the web material and said counter-blades are disposed over said path.  
     
     
         34 . A device for longitudinal cutting of a continuous web material, comprising a path for the web material and, along said path, at least one cutting unit comprising: a plurality of blades disposed on one side of said path, which can be positioned transversely to the direction of feed of the web material and cooperating with a fixed counter-blade disposed on the opposite side of said path, comprising a rectilinear element extending transversely to the direction of feed of the web material and for a substantial part of the useful width of the device, wherein said rectilinear element comprises a metal bar and an interchangeable block made of plastic material associated therewith.  
     
     
         35 . Device as claimed in  claim 34 , wherein said metal bar and said interchangeable block form a flat supporting and sliding surface for the web material.  
     
     
         36 . Device as claimed in  claim 34  or  35 , wherein said metal bar is produced on a section bar integral with a base plate, said section bar and said base plate forming a channel to house said interchangeable block.  
     
     
         37 . Device as claimed in  claim 34 , wherein said interchangeable block is produced of a plurality of sections aligned along the extension of the counter-blade.