Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
  • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
  • B26D7/00—Details of apparatus for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting
  • B26D7/26—Means for mounting or adjusting the cutting member; Means for adjusting the stroke of the cutting member
  • B26D7/2628—Means for adjusting the position of the cutting member
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
  • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
  • B26D7/00—Details of apparatus for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting
  • B26D7/26—Means for mounting or adjusting the cutting member; Means for adjusting the stroke of the cutting member
  • B26D2007/2607—Means for mounting or adjusting the cutting member; Means for adjusting the stroke of the cutting member for mounting die cutters

Definitions

• the present invention relates to a device for positioning a cutting plate on a cylinder with magnetic fixing.
• the cutting of cardboard blanks mainly uses two essential techniques, namely the process known as SK (“Single Knife”) in which the cardboard blank is admitted between two associated cylinders, namely a cutting cylinder and a counterpart cylinder, and the so-called TK process (“Twin knife”) in which the cardboard blank is admitted between two cutting cylinders, the imprints of which are rigorously identified with respect to one another.
• SK Single Knife
• TK twin knife
• a first means consists, after identification and positioning, of welding the plate to the support cylinder by its two ends.
• such a technique has the drawback of requiring significant mechanical means to ensure tension and a perfect application of the plate on the support cylinder.
• a second means consists in placing, on one of the faces of the plate, at each of its longitudinal ends, a parallelepipedic holding element, each holding element coming to be embedded in a longitudinal groove provided on the surface of the cylinder.
• the tension is ensured by a system of wedges which tends to bring the two parallelepipedic elements together.
• a disadvantage of this type of technique is that it requires a voltage which is constant on the plate to be effective and which is also distributed around the periphery of the cylinder.
• a third means of fixing the plate to the support cylinder consists of using magnetic means which essentially consist of magnetic bars which are embedded in longitudinal grooves provided at the periphery of the support cylinder. Plate holding devices of the latter type are inexpensive and easy to implement.
• a disadvantage however of this technique is that, once the plate positioned on the cylinder, it is no longer possible to make a correction, however small, of its positioning. Precise positioning, especially when cutting is carried out using the TK technique, is essential for the proper functioning of the system. This is why such a type of attachment is not used when extremely precise positioning of the plate on the cylinder proves necessary.
• the cutting machines are provided with means making it possible to ensure such a displacement of the support cylinders so as to compensate for any offset in the longitudinal direction.
• the plate support cylinders are provided with means making it possible to provide angular compensation for one cylinder with respect to the other, in particular by acting on gears ensuring their drive.
• the present invention aims to provide a means for ensuring both the correction of the orientation of a cutting plate in the direction transverse to the cylinder and the correction of the relative angular positioning of two associated cylinders.
• the present invention thus relates to a device for positioning a plate on a cylinder, in particular a cutting or fold-forming cylinder, characterized in that the cylinder is provided on the one hand with magnetic fixing means ensuring the maintenance of the plate on the surface thereof, and on the other hand of two centering elements, at least one of which is movable and longitudinally spaced from the first, so as to cooperate with means complementary to the plate, the element of mobile centering being linked to control means capable of ensuring its displacement at least along one transverse axis of the cylinder.
• the positioning device will include a centering element fixed relative to the cylinder, so as to ensure an orientation of the major axis of the plate relative to the transverse axis of the cylinder.
• the present invention also makes it possible, when the two centering elements are mobile elements whose displacement takes place along the transverse axis of the cylinder, to move the plate parallel to itself, which amounts to rotating it around the cylinder so that this ensures an angular offset of this plate relative to the plate disposed on the associated cylinder.
• the centering elements will consist of pins and the complementary elements will consist of holes provided in the plate.
• the pins will preferably be made of cylindrical elements of circular cross section.
• the orifice corresponding to the movable pin may have an elongated shape in the longitudinal direction of the axis of the cylinder, its other dimension corresponding strictly to the external diameter of the pin.
• the control means may advantageously be constituted by a lever mounted pivoting about an axis integral with the cylinder, one end of which will include a locating element integral with the other side of the plate and which will be able to effect an angular displacement under the action of control means arranged at the other end of the lever.
• the control means can be constituted by a screw provided with a control button comprising an adjustment vernier.
• the control means may also be constituted by a system comprising a sloping wedge mounted movable substantially in a plane tangent to the cylinder and inclined relative to the longitudinal axis thereof, on which is disposed the movable centering pin.
• Figure 1 is a schematic view illustrating the angular offset caused by improper positioning of a plate on a cutting cylinder.
• Figure 2 is a partial schematic view illustrating the principle of implementation of the invention.
• Figure 3 is a view of a cutting cylinder coated with its plate and showing the means for controlling the correct positioning of the latter.
• Figure 4 is a partial sectional view showing a cutting plate disposed on a cylinder and the device for ensuring the correct positioning of said plate.
• Figure 4a is a tangential sectional view with respect to the cylinder, of a method of holding the plate by a pin integral with the latter.
• Figure 4b is a sectional view along line IV-IV of Figure 4, of an alternative embodiment of one invention.
• Fig 5 is a partial radial section view of an alternative embodiment of a plate positioning device according to the invention.
• Figure 6 is a schematic sectional view of the device shown in Figure 5 along line VI-VI thereof.
• FIGS. 7 and 8 schematically represent an alternative embodiment of the embodiment shown in FIGS. 5 and 6.
• Figure 9 is a partial sectional view of an embodiment allowing a transverse movement of a movable centering pin.
• Figure 10 is a partial elevational view of a cylinder and a device assisting in the establishment of the plate thereon.
• Figure 11 is an enlarged partial sectional view of the device shown in Figure 10 along line XI-XI thereof.
• Figure 12 is a partial radial sectional view along the axis of the cylinder of an alternative embodiment of the invention.
• Figure 1 shows, in unwound form, the external surface of a cutting cylinder 1 with a longitudinal axis xx 'and a cutting plate 3 which is held on the surface thereof by longitudinal magnets, not shown in the drawing, which are distributed over the periphery of the cylinder.
• the longitudinal axis xx ′ will be denoted by the longitudinal axis xx ′ of the cylinder 1, and by the transverse axis zz ′ the axis perpendicular to the longitudinal axis xx ′ when the surface of this cylinder is deployed.
• the major axis uu 'of the plate 3 will denote the axis of the latter which can be arranged along the transverse axis zz' of the cylinder, and the minor axis w 'the axis of the plate 3 perpendicular to the major axis. uu '.
• the present invention thus proposes to avoid the angular offset and to ensure that the major axis uu 'of the plate 3 is parallel to the transverse axis zz' of the cylinder 1.
• a fixed centering pin 5 has been placed on the external surface of the cylinder 1, near one of the edges thereof, at the top of the plate 3, at an angle of this corresponding to the pin 5, an orifice 7 perfectly adjusted to the pin 5, and it is therefore understood that if the plate 3 is made to rotate according to the arrow F around the pin 5, it will therefore be possible to bring the axes uu 'and zz' parallel, as shown in Figure 2.
• the second pin 9 is arranged on means 13 making it possible to move it in the direction of the transverse axis zz 'of the cylinder 1. Under these conditions, to implement the invention, the procedure will be done as described below.
• FIG. 4 shows a device making it possible to achieve, in a controlled manner, the required displacement of the pin 9 in the direction of the transverse axis zz 'of the cylinder 1.
• This device consists of a lever 15, which is arranged in a cavity 17 hollowed out in the cylinder 1, and which is rotatably mounted about an axis 19. The internal end of the lever 15 is articulated around the second centering pin 9 intended to cooperate with a fixed centering pin 5 integral with the cylinder 1, to ensure the positioning of the plate 3.
• the opposite external end of the lever 15 is pierced with a threaded hole in which a screw 21 takes place, the end of which bears against one of the bordering sides the cavity 17 under the action of a spring 25 which is supported, by each of its ends, in respective cavities 20 and 29 provided in the cylinder 1 and in the lever 15.
• the other end of the screw 21 is provided of a control head 23.
• a portion of the head 23 of the screw 21 can be provided with a vernier 24.
• this vernier 24 may include graduations which correspond to the value b of the displacement in the direction of the axis zz 'which it is desired to apply to the pin 9. It is also possible, which simplifies the role of the adjuster, to graduate the vernier 24 with a graduation corresponding directly to the value a constituting the offset in the longitudinal direction xx 'of the cylinder 1, of the two marks C and D. Thus the user, to carry out his correction, will only have to carry out the measure the value a and transfer it to the vernier 24 of the screw control button 21.
• the present invention is particularly advantageous in that it makes it possible to combine the simplicity of the method of attachment with the repetitive nature of the adjustment, so that it is possible to note on each of the plates 3 the value of the offset to be adjusted on the vernier 24 to, without prior operation, ensure correct positioning thereof. It is thus possible for the user to switch particularly quickly from one plate 3 to another according to his needs.
• the orifice intended to receive the movable pin 9 an elongated shape in the longitudinal direction of the axis of the cylinder xx '.
• the width of the light 11 ′, as well as shown in FIG. 4a, will be equal to the diameter of the centering pin 9.
• any other means making it possible to ensure a controlled movement of the centering pin 9 in the transverse direction zz 'of the cylinder 1. It would thus be possible, as shown in FIGS. 5 and 6, to place the movable centering pin 9 'eccentrically on an axis 26 of larger diameter E, the latter being rotatably mounted in a housing 27 provided in the cylinder 1.
• the diameter E of the axis 26 will be large relative to the diameter d of the centering pin 9 ', so that the displacement of the center O of the pin 9' in the longitudinal direction is negligible compared to the required displacement of this same center O along the transverse axis zz 'of the cylinder 1.
• the centering pin 9 ′ will be immobilized by blocking the axis 26 in rotation by any suitable means.
• the plate 3 is provided with a pin 9 "which comes to take place in an orifice 12 provided on the upper surface of the axis 26.
• the fixed pin 5 will be disposed on plate 3 and the corresponding orifice will be hollowed out in cylinder 1.
• FIG. 9 One could also according to the invention, in order to move the movable stud 9 along the transverse axis zz 'of the cylinder 1, replace the lever with a slide system, as shown in FIG. 9.
• the external surface of the cylinder 1 is hollowed out with a groove 40 whose axis aa 'is inclined at an angle ⁇ relative to the transverse direction zz' of the cylinder 1.
• This groove 40 receives a slide 42 which is movable in translation inside of the latter under the action of a screw 44 which is screwed into the slide 42 and which is immobilized in translation relative to the cylinder 1 and movable in rotation relative to the latter.
• any rotational movement communicated to the screw 44 by a control member 46 disposed at the end thereof has the effect of moving the pin 9 along the axis aa ', for example of a length 1 , and that this displacement corresponds to a displacement along the transverse axis zz 'equal to lcos ⁇ .
• an orifice for receiving the pin 9 of elongated shape will be used, as shown in FIG. 4a.
• means for assisting the installation and removal of the plate 3 are provided.
• these means consist essentially of a flat positioning plate 50 made of a non-magnetic material, which is able to be arranged using means (not shown in the drawing ) so that its lower face is substantially tangential to the external surface of the cylinder 1.
• the upper corners of the positioning plate 50 are provided with notches 52 intended to release the pins 5, 9 which maintain the plate 3.
• Such an arrangement allows the user to easily position the orifice 7 of the plate 3 on the fixed pin 5 secured to the cylinder 1 since, under these conditions, the magnetization effect caused by the magnetic elements embedded in the cylinder 1 is exerted on the plate only by the reduced surface thereof which is released by the notch 52. Thanks to the position plate The user can thus easily pivot the plate 3 to put the second free orifice in place in the movable pin 9.
• the positioning plate 50 may consist of two elements, namely a thick rigid support element 50a and an element 50b thinner and thinner than the pin 5.
• one of the lower angles thereof will preferably be cut so as to present a bevel 54.
• the user will be able to slide a metal spatula 56 in the angle formed by the bevel 54 and the upper surface of the cylinder 1 so that the plate 3 can be detached from the surface of the latter.
• the present invention also makes it possible to ensure the correction of the relative angular positioning of two plates arranged on two associated cylinders such as a cutting cylinder and its counterpart cylinder.
• at least one of the two cylinders will use two movable pins 9 adjustable along the transverse axis zz 'of the cylinder. This arrangement makes it possible, if desired, to move the two pins parallel to this transverse axis zz ', that is to say to rotate the plate relative to the cylinder while keeping it parallel to itself.
• the present invention also makes it possible, with the same device, to correct both the relative angular positioning of two associated cylinders and to correct the orientation of the plate by giving each of the two movable pins 9 displaced in the transverse direction zz ' of the cylinder different displacements.

Landscapes

• Life Sciences & Earth Sciences (AREA)
• Forests & Forestry (AREA)
• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Details Of Cutting Devices (AREA)
• Feeding Of Articles To Conveyors (AREA)
• Supply, Installation And Extraction Of Printed Sheets Or Plates (AREA)
• Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
• Iron Core Of Rotating Electric Machines (AREA)
• Registering, Tensioning, Guiding Webs, And Rollers Therefor (AREA)
• Folding Of Thin Sheet-Like Materials, Special Discharging Devices, And Others (AREA)
• Bending Of Plates, Rods, And Pipes (AREA)
• Magnetic Heads (AREA)
• Coating With Molten Metal (AREA)
• Adjustment Of The Magnetic Head Position Track Following On Tapes (AREA)

Applications Claiming Priority (3)

Publications (2)

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• 1999
  • 1999-07-09 FR FR9908934A patent/FR2795988B1/fr not_active Expired - Fee Related
• 2000
  • 2000-07-07 EP EP00949680A patent/EP1112154B1/de not_active Expired - Lifetime
  • 2000-07-07 US US09/786,558 patent/US6629914B1/en not_active Expired - Lifetime
  • 2000-07-07 DK DK00949680T patent/DK1112154T3/da active
  • 2000-07-07 WO PCT/FR2000/001974 patent/WO2001003894A1/fr active IP Right Grant
  • 2000-07-07 AT AT00949680T patent/ATE240192T1/de not_active IP Right Cessation
  • 2000-07-07 DE DE60002653T patent/DE60002653T2/de not_active Expired - Lifetime

Non-Patent Citations (1)

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