FR2625485A3 - Winder with an automatic cutting and fixing device - Google Patents

Abstract

In order to enable a roll to be changed "on the fly", the winder is equipped with an automatic cutting and fixing device 15 intended for cutting the sheet material when the maximum diameter of the roll is reached, and in affixing the leader (leading end) of the sheet material 7 delivered onto a new winding cylinder 6'. This cutting and fixing device 15 is provided with a cutting head 18 consisting of a cutting blade located at the front, in the direction in which the sheet material 7 passes, intended to cut the sheet material 7, and with an inductor electrode for electrostatically charging the continuously-delivered sheet material, so as to fix, without adhesive, its leader (leading end) to the surface of the new winding cylinder. … …

Description

The subject of the invention is a reel comprising a support device

from cylinder to cylinder

  arranged in a cross, comprising a trans-

  fert to allow a roll change on the fly as well as an automatic cutting and hooking device intended to cut the strip material and

to fix it.

  We know how to equip the reels with a device

  automatic cutting which cuts the material strip

  coiled riau, when during the winding of a ma-

  strip material, such as paper or sheets of

  plastic material, on a mandrel, the maximum diameter

  roller sore is reached; we also know how to equip it

  a device which affixes the initiation zone of the material

  strip feed continuously from, for example, a

  grille, on a new bare mandrel, in order to

  put a roll change on the fly. To fix the starting zone of the strip of material, which is behind the cutting blade of the automatic cutting device in the direction of travel, on the new empty mandrel, it is important that this starting zone comes apply, immediately after the cutting operation, flat on the surface of the new mandrel. This assumes that the strip is not doubled, that the material is not wrinkled or that there is no retaining zone in the region of the primer, and that a uniform tensile force is obtained. exerts on the strip of material delivered continuously,

  because these disturbances in the winding are reflected

  cut on several initial turns of a roll, and make the strip material unusable for many applications, for example for

  products intended for printing or packaging.

  It has been found that the bonding techniques or the mechanical fixing means are less and less

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  less able to ensure a perfect transition,

  reproducible, due to an operating speed

  increasing winders, following

  greater precision requirements and

  more complicated tructions. The object of the invention is therefore to produce a reel comprising an automatic cutting and fixing device, in which, at the time of cutting the strip, the affixing operation can be initiated in a succession adjustable over time of such so that the leading edge of the incoming strip of material can be placed in an initial position where it is

pressed against an empty mandrel.

  This object is achieved with the reel according to the invention in that the automatic device for

  cutting and fixing features a pre-

  sensing a cutting blade located at the front, in the direction of passage of the strip material, as well as an inductor electrode disposed behind the cutting blade in this direction of passage, and opposite the same

face of the strip material.

  An exemplary embodiment of the reel according to the invention is described below in more detail with reference to the accompanying drawings, in which:

  Figure 1 shows schematically a winding

  their during the winding of a roll of strip material; Figure 2 shows the reel of Figure 1, immediately before the roll change, with

  retracted transfer device and automatic device

  tick for cutting and fixing in the waiting position, and FIG. 3 shows detail III of FIG. 2 on a larger scale, with the automatic device

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  cutting and fixing in standby position and

working position.

  In the drawing, the reference 1 designates one of the

  two reels supporting a reel which are available

  seeds spaced from each other on a shaft 2, and mounted, so as to be able to rotate with the latter in a clockwise direction (arrow A,

  Figure 1), in a machine chassis not shown.

  Each support cross bears at each of the extremi-

  external tees of its support arms 3, a bearing device 4 not shown in detail, for

  two return cylinders 5, 5 'diametrically opposite

  sés, and two winding cylinders 6, 6 ', also diametrically opposite. The return cylinders 5, 5 ′ can be bare steel cylinders; the winding cylinders 6, 6 ′ are preferably driven shaft elements, designed to receive so

  removable, mandrels (eg cardboard).

  FIG. 1 shows the operation during which a strip material 7, for example an electrical insulator, coming from a paper or

  sheet, or a grille, is introduced into the

  roller, by an inlet cylinder 8 and the winding cylinder 6 ', and is sent to the winding cylinder 6 where the strip material 9 is wound up

  on it, via the return cylinder

  see 5. A transfer device 11 which can pivot around a shaft 10, is, like the support device, constituted by the support crosses 1, the shaft 2, and the cylinders 5, 5 'and 6, 6' mounted on the support arms 3, carried by the machine chassis (not shown) and is shown in its position

  rest deployed. The transfer apparatus 11 is

  essentially made up of a roughly V-shaped support 12, which is fixedly connected to the shaft 10, of two auxiliary return cylinders

  strip material 13, 14 and a self-adhesive device

  cutting and fixing material 15. The role of the auxiliary return cylinders 13, 14 is best illustrated in FIG. 2, and the operation of the device

  automatic cutting and fixing system which

  tiel, consists of a bent lever 16 mounted in 19, a cylinder and piston drive group 17

  as well as a cutting head 18, is described with reference to

Refer to Figure 3.

  As soon as the diameter of the roll of strip material 9 approaches its target value, the transfer device 11 tilts inwards, in the direction

  arrow B, in the area of the support cross.

  In doing so, the auxiliary return cylinder 14 comes first (FIG. 1) in contact with the strip material 7 at C, and pushes the latter into the zone of the

  support cross until the cylinder

  reference link 13 also comes into contact with the

  strip material permanently delivered. The pivot

  inside the transfer device 11

  is finished when it has approximately reached the posi-

  tion shown in Figure 2 which can be defined by a stop (not shown). The wrapping of the winding cylinder 6 ′, provided with a mandrel, has thus passed from a simple contact line to approximately / 8 of the circumference of the mandrel. The strip material then passes from the input cylinder 8 to the winding cylinder 6 ', to the auxiliary return cylinders 14 and 13, and from the return cylinder 5 to the

  strip material 9. At this time, the initial position

  tial of the automatic cutting and fixing device

  tion 15 has not changed yet on the trans-

  fert 11, and the cutting head 18 of the automatic device

  cutting and fixing tick is located between the two strands 20 and 20 'leading to and from the auxiliary return cylinder 14, as shown more

particularly Figure 3.

  In this figure, the cutting head 18, located at the elbow end of the lever 16, is drawn on a larger scale and in more detail. It consists of a cutting blade 21 and a point electrode device 22 which, provided with a mounting flange 23, is screwed onto the bent lever 16. The cutting blade 21 and the device tip electrodes 22 extend substantially over the entire length of the cylinders 6 ', 14 or on the roll of strip material 9. The tip electrode device 22 may include a conventional elongated inductor electrode with a support electrode 24 embedded in a plastic body, which support connects

  spiked electrodes, spaced 3 10 cm apart, spring

  both a front U-shaped groove. The point electrodes are advantageously inclined on the side of the cutting edge of the blade, at an angle α of 45 5 with respect to the front of the cutting blade, and lie between approximately 10 and 15 mm from the surface of the material in question. strip, when cutting the strip material. The inclination of the electrodes p relative to

  the trajectory of the strip material is at this point

  both equal to 55-65; after cutting the strip

  and application of the edge 26 of the backband material

  vant against the mandrel 27, its value approaches 90.

  The tip electrode device 22 is advantageously designed so as to form a unit

  removable with the cutting blade 21.

  Roll change in a rewinder

  vant the invention is "on the fly", that is to say that the passage of the winding of the web material from a first roll to a second roll, can be done without interrupting the supply of material in a band. To this end, when the target diameter of the first roller 9 is reached, the material supply thereof is terminated, and the strip material fed continuously is sent to another roller already rotating synchronously. In the reel according to the invention, this is done - with reference to Figure 3 - so that just before the cutting instruction by which the tilt lever 16 (shown in dotted lines) places the cutting blade 21 against the strip material 7, on the strand 20, the spike electrode device 22 is put under a positive direct voltage of about kV, the strip material, for example of electrical insulation, is positively charged with static electricity . As soon as the strip strand 20 is cut in half at point 25, the edge of strip material 26 located at the front of the blade 21 is applied against the electrically negative surface of the mandrel 27 placed on the winding cylinder 6 'earthed. The location of the cutting point 25, including possible displacement by inertia of the electrode device towards the surface of the cylinder

  winding 6 ', and the charging voltage of the device

  electrode 2 must be adapted to each other so that the primer of the strip material 26 lies flat on the surface of the mandrel 27, upstream of the insertion slot 28 separating the cylinders 6 ' and 8, into which the strip material is introduced, passing through the intermediate positions 26 ′, 26 ". Only in this way can an accumulation of material be prevented upstream from the insertion slot 28 , which would disturb the winding operation. After applying the primer of the 26 "strip material, on the mandrel 27, the electrode device 22 remains for two or three turns of the winding cylinder 6 ', at point where it is closest to this cylinder. The power supply to the electrode device 22 is then cut, and the automatic cutting and fixing device 15 as well as the transfer device 11 are returned to their respective starting positions.

or rest.

  After that, the device of s, Drt of the cylinders 5, 5 'and 6, 6' rotates clockwise in two steps of 90. On the one hand, the roll of strip material which is to be formed on the cylinder 6 'driven continuously, first reaches the location of the support cylinder, and the roll of strip material 9 finished which

  continues to turn until it stops, arrives at the

  right of the return cylinder 5 '. The roll of material

  strip riau 9 is removed, at this location, with its winding cylinder, from the corresponding bearing device 4, and a new winding cylinder with mandrel is put in place. During the second step of 900, this last winding cylinder passes to the location of the initial winding cylinder 6 'and

  is driven again, while the roller

  the hoe turns to reach the lower position of the initial winding cylinder 6. We again have the situation shown in Figure 1. This cycle can

repeat itself at will.

Claims (3)

  1. Rewinder comprising a cylinder support device (2, 3) with cylinders arranged in a cross, comprising a transfer device (11) for allowing a change of roll on the fly as well as an automatic device for cutting and fixing (15) intended to cut the material into strips and to fix it, characterized in that the automatic cutting and fixing device comprises a cutting head (18) having a cutting blade (21) located at the front, in the direction of passage (20) of the strip material (7), as well as an inductor electrode (22) disposed behind the cutting blade in this direction of passage, and   opposite the same side of the strip material.   2. Reel according to claim 1, character-   risé in that the inductor electrode is a dispo-   point electrode electrode (22) whose electrodes form an angle a of 45 5 with respect to the front of the cutting blade.   3. Winder according to claim 2, character-   rised in that the spike electrode device (22) is a unit comprising a mounting flange (27), and which can be mounted on a bent lever device (16) of the automatic cutting and fixing device, at the same time the cutting blade (21).