Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
  • B65H23/00—Registering, tensioning, smoothing or guiding webs
  • B65H23/04—Registering, tensioning, smoothing or guiding webs longitudinally
  • B65H23/34—Apparatus for taking-out curl from webs

Definitions

• the present invention relates to a device for
• webs are used which are cut continuously from a reel and which are then cut, after having been previously printed or not.
• Such is, for example, the case of a machine for manufacturing pieces or "blanks" of cardboard, intended to subsequently constitute boxes, these blanks being cut from a sheet of cardboard supplied from a reel. Since this cardboard sheet is wound on
• the radius of curvature of the natural shape of the cut cardboard blanks varies according to the turn of the sheet considered, the radius of curvature being naturally much greater in the vicinity of the periphery of the reel than in the central part of that -this.
• the devices known rectifier comprise a pair of return cylinders with parallel axes on which the web passes by forming a flat section contained in the plane tangent to the two return cylinders, and a rectifier block mounted movable between the two return cylinders, in a direction perpendicular to the plane of the web between these two cylinders.
• This rectifier block comprises at least one pressure member extending transversely with respect to the ply and which can come to bear, by exerting pressure, on a face of the planar section of the ply, so as to repel it outside the plane tangent to the two return cylinders and thus create a V-shaped ply section between the two cylinders.
• This action of the mobile rectifier block pressure member makes it possible to break the fibers of the cardboard somewhat and to counterbalance the natural curvature of the cardboard web, which makes it possible to obtain flat cardboard blanks later.
• this device for straightening a sheet of material, for example cardboard, continuously scrolling, cut from a reel, comprising a frame comprising supports for the bearings of two return cylinders, with parallel axes , over which the ply passes by forming a flat section contained in a plane tangent to the two cylinders, and a rectifier block mounted movably between the two return cylinders, perpendicular to the ply section extending between these two cylinders, this rectifier block mobile comprising at least one transverse pressure member capable of coming to bear on one face of the ply to push it out of the plane tangent to the two cylinders and give it the shape of a V between these two cylinders, is characterized in that the bearing supports of the two return cylinders constitute guides for the bearings mounted movable on these supports and connecting means are provided between the bearing supports of the two return cylinders.
• Figure 1 is a simplified schematic elevational view of a device for straightening a sheet fed from a coil, the movable rectifier block being shown in the inactive position in which it does not act on the sheet.
• Figure 2 is a simplified schematic elevational view similar to that of Figure 1, the movable rectifier block being shown in an active position in which it causes a V-shaped deformation of the web.
• Figure 3 is an elevational view of an alternative embodiment of the straightening device.
• the straightening device according to the invention is intended to act on a web 2 continuously scrolling and which is delivered at from an upstream coil 3.
• the sheet 2 can be a sheet of any material having a "shape memory", that is to say which tends to resume, when it is cut into pieces, downstream , its natural curved shape that it previously had within the reel 3.
• shape memory that is to say which tends to resume, when it is cut into pieces, downstream , its natural curved shape that it previously had within the reel 3.
• the axis of the coil 3 and the axes of all the cylinders 4,5,6,7 are horizontal and transverse with respect to the direction of travel of the sheet 2.
• the rectifying device 1 according to the invention comprises a rectifier block 8 which is disposed between the two return cylinders 5 and 6.
• This rectifier block 8 is mounted vertically movable on the frame, not shown, of the device 1, as indicated by the arrow f.
• the rectifier block 8 can move perpendicular to the horizontal section 2a of the ply 2 which is located in the upper plane P tangent horizontally to the two return cylinders 5 and 6.
• the rectifier block 8 comprises two pressure members s' extending transversely, namely an upper horizontal and transverse rod 9, situated above the section 2a of the ply, and a lower horizontal and transverse rod 1 1 situated below the section 2a.
• the stems of pressure 9 and 11 are separated from each other by a small interval and they can act respectively on the ply section 2a, according to the direction of movement of the rectifier block 8.
• the respective bearings 12 and 13 of the return cylinders 5 and 6 are movably mounted on suitable supports 14, 15 provided on the frame of the straightening device 1, these supports 14,15 being constituted by housings or cams which can be straight.
• connection means are provided between the rectifier block 8 and the bearings 12, 13 of the return cylinders 5,6.
• These connecting means may preferably be of the mechanical type and they may then be constituted, as shown in FIGS. 1 and 2, by connecting rods 16 and 17, both located below the horizontal section 2a of the ply and which are articulated, at one of their ends, on the rectifier block 8, around respective axes 18,19 and, at their other ends, on the bearings 12, 13 of the return cylinders 5,6.
• the axes 18, 19 of articulation of the connecting rods 16, 17 are located at a level lower than that of the lower rod 11 and symmetrically with respect to the vertical and transverse plane PI containing the axes of the rods 9 and 11.
• the axes of the cylinders 5,6 are separated by a distance d and the connecting rods 16, 17 can extend horizontally, as shown in FIG. 1, or they can be inclined relative to the horizontal, the angle of inclination depending on the geometry of the straightening device.
• the housings or cams 14, 15 which constitute the guide supports for the movable bearings 12, 13 of the return cylinders 5, 6 can also be horizontal or even inclined relative to the horizontal, depending the geometry of the straightening device.
• the straightening block 8 When the straightening device 1 is put into service, that is to say it is placed in an active position as shown in FIG. 2, the straightening block 8 is lowered so that its upper pressure rod 9 comes into contact with the upper face of the ply section 2a and then pushes this section down, giving the ply section 2a a V shape with a point directed downwards, as shown in the figure 2.
• This action of the upper pressure rod 9 has the effect of breaking the fibers of the cardboard web and of compensating for the natural curvature of the cardboard blanks cut later which would tend to have a "bulge” or an upward convexity. , due to the "shape memory" of the cardboard constituting the ply wound in the form of the coil 3.
• the supports 14, 15 constituting movable bearings
• the rectifier block 8 would then be moved up, its lower rod 11 would raise the ply section 2a. in order to form a V-shaped section with an upward-pointing point, the axes 18, 19 of the connecting rods 16, 17 would be driven upwards, passing the connecting rods in positions inclined downwards 3 and in the direction return cylinders 5,6, and the bearings 12,13 would again be close together and slightly elevated on their supports 14, 15. The same effect would compensate for the variation in length of the ply 2. In the variant of execution shown in the figure
• the upstream 5 and downstream 6 return cylinders are located respectively below and above the horizontal tangent plane P along which extends the horizontal section 2a of the ply 2.
• the ply 2 passes under the cylinder of downstream return 6 and it is then deflected upwards, in the direction of the downstream debtor cylinder 7 which is located above the plane P.
• the connecting rods 16 connected to the bearings 12 of the upstream return cylinder 5 are located under the horizontal section 2a of the ply 2, while the connecting rods 17 connected to the bearings 13 of the downstream return cylinder 6 are located above this horizontal section 2a.
• the articulation axes 18, 19 of the connecting rods 16, 17 on the rectifier block 8 are symmetrical to one another with respect to the intersection of the horizontal plane P and the vertical plane PI.
• the straightening device shown in Figure 3 is particularly interesting because it can allow 100% compensation for the variation in length of the ply 2 by playing on the profiles of the cams 14, 15 constituting the supports of the bearings 12, 1.
• connecting means between the movable rectifier block 8 and the return cylinders 5,6 have been described as being constituted by connecting rods, it goes without saying that they could be produced in any other way, in particular by pneumatic means , hydraulic, electrical, etc., controlling the movement of the movable bearings 12, 13 of the return cylinders 5, 6 to the movement of the rectifier block 8.

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• Making Paper Articles (AREA)
• Winding Of Webs (AREA)

Applications Claiming Priority (3)

Publications (2)

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ID=9445303

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Country Status (5)

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• 1993
  • 1993-03-24 FR FR9303398A patent/FR2702993B1/fr not_active Expired - Fee Related
• 1994
  • 1994-03-24 EP EP94911214A patent/EP0642461B1/de not_active Expired - Lifetime
  • 1994-03-24 WO PCT/FR1994/000327 patent/WO1994021546A1/fr active IP Right Grant
  • 1994-03-24 JP JP6520736A patent/JPH07507530A/ja active Pending
  • 1994-03-24 DE DE69405180T patent/DE69405180T2/de not_active Expired - Fee Related

Non-Patent Citations (2)

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