ITUB20156877A1 - A winder module for winding a band around a core and with a pre-cut section, winding and tearing incorporated in the same module. - Google Patents

Description

A WINDING MODULE TO WIND A RIBBON AROUND A CORE AND WITH A PRE-CUT, WINDING AND TEAR SECTION INCORPORATED IN THE SAME MODULE

Scope of the invention

The present invention relates to the technical sector relating to machinery for the production of rolls of continuous tape, generally a tape of plastic material.

In particular, the invention refers to a particularly compact and versatile wrapping module.

Brief notes on the known art

The production lines for rolls of tape, for example in plastic material, which then has multiple industrial uses, have been known for some time.

Through these lines, reels of various sizes of tubular film or single sheet are produced.

The reel is wound on a cardboard or plastic core in various different lengths.

According to the uses for which the roll is intended, the tape can be continuous or pre-cut transversely at a predetermined pitch to facilitate the detachment of a segment from the previous one during the unwinding in use.

Reels of agricultural film or cover sheets can also be produced.

The uses are therefore multiple and range from carpentry and hardware (for example as protective sheets for painters that are found in usual retailers) up to applications in the agricultural field in which the sheets are unrolled and spread in fields to protect crops or greenhouses.

The length and width dimensions of the wound tape can be different, depending on the needs.

Basically, the production line starts from an extruder from which a continuous belt is produced which must then be wrapped around the aforementioned cores and for a predetermined length.

The elements of these lines mainly provide a pre-cut section, a winding section, a tear section and an unloading area for the completed web.

The pre-cut serves to incise the tape transversely so that, during winding, it can be torn along the weakening line upon completion of the wound reel (therefore upon reaching the predetermined length) and thus allow a new winding. Furthermore, as mentioned, a pre-cut could also be made at each predetermined length of tape to create flaps that can be torn during use.

Having said all this, generally the pre-cut, winding and tear-off sections are placed on modules that are separate from each other. All this forces the purchase of single modules with large dimensions and little versatility of the entire line.

Summary of the invention

It is therefore an object of the present invention to provide an innovative winding module for the production of rolls of tape which at least partially solves the aforementioned technical drawbacks.

In particular, it is an object of the present invention to provide a rewinding module for winding a tape around a core which is versatile and independent, performing itself all the necessary functions.

These and other purposes are therefore achieved with the present winding module for winding a tape, according to claim 1.

This winding module (1) is characterized by the fact that it simultaneously incorporates a pre-cutting section (20) for the tape, a section (30) for winding-change and a tear-off section (70) for the tape.

In this way all the aforesaid technical drawbacks are easily solved.

In particular, the winder module is now independent and can even be placed downstream of an extruder alone.

Having incorporated both a pre-cut section, a winding-exchange section 30 and the tear-off section 70, it is no longer necessary to purchase and put several separate modules on-line, i.e. the pre-cutting module separate from the one of winding-exchange and finally tear but, on the contrary, everything is included in a single unit, therefore with a considerable saving of dimensions and costs. The whole is therefore extremely more versatile even in the uses for which it is intended.

Further advantages can be deduced from the dependent claims.

Brief description of the drawings

Further characteristics and advantages of the present winding module, according to the invention, will become clearer with the following description of some of its embodiments, given by way of non-limiting example, with reference to the attached drawings, in which: - Figure 1 shows an overall axonometric view of a winding module according to the present invention;

- Figure 2 is a side view of the winder module as a whole to highlight its components.

- Figures 3 to 6 show side views to highlight the operation during a production phase;

Description of a preferred embodiment Figure 1 describes the winding module according to the present invention in an overall axonometric view.

The rewinder module 10 includes the following sections inside which will be detailed below:

- Pre-cut section 20, to engrave the tape; - Winding and exchange section 30,

- A tear section 70 cooperating with the winding and exchange section 30;

- Finished roll removal section 40.

Going more into the descriptive detail of the invention, Figure 2 shows the above components in a side view.

The pre-cut section provides an upper assembly 2 on which a transverse blade 6 is mounted.

A counter-support 2 'is then provided on which the tape rests during its passage. The counter-support is in fact a stop against which the blade contrasts during cutting, so that the belt is trapped between the blade and the counter-support, allowing the blade to penetrate the material.

The blade is generally of the notched type, i.e. it cuts into the tape creating a weakening line formed by a line that includes empty spaces, in which the material has been removed as the tooth of the blade has penetrated, and spaces of coherent material (precisely defined pre-cut).

The counter-support is therefore shaped with a seat for receiving the cutting edge of the blade such that the tape can be engraved.

The blade could for example be movable only vertically with a fixed counter-support.

However, in the preferred configuration of the invention, the blade and counter-support are rotatably movable and synchronized with each other, in such a way as to follow the direction of advancement of the belt.

This can be achieved by fixing the bar that mounts the blade to an eccentric connected to a rotating pulley. When the pulley rotates, the eccentric to which the bar is attached also rotates.

The same happens for the counter-support in such a way that both go towards each other along a curved path, in such a way as to follow the advancement of the belt.

Continuing in the structural description of the invention, the winding-change section combined with the tear-off section is then provided.

In particular, with reference again to Figure 2, a side view shows the winding and exchange section 30, which collaborates with said tearing section 70.

A block 31 is therefore provided that can rotate around the axis 32 on which the winding axes 33 and 34 are mounted. Figure 1 shows this rotatable block 31 on which the aforementioned winding axes 33 and 34 are also highlighted.

These winding axes, as can also be seen from Figure 1, are extractable / retractable tips that are controlled to fit into the two ends of the core tubular, locking it and then bringing it into rotation. The core can be in plastic or cardboard.

A core loading surface 50 is provided in proximity to section 30 (below it in a suitable position) and is formed by a chute where a plurality of cores can be arranged.

The core placed at the end of the stroke 51 is the one ready to be picked up. Once the penultimate core has been picked up, it rolls to the end of its stroke, given the slope of the loading surface.

This loading system, as immediately described below, allows for great autonomy and automation throughout the production process.

The tearing section 70 is composed of a first arm hinged in the fulcrum 75 and which provides a pressure roller 71, to follow the growth of the web, and a curved arm 72 that can be rotated. A second arm is coupled to them, hinged at the point 75 'and provided with an actuator 73 from which a straight arm 76 protrudes.

The sequence of the following figures from 3 to 6 shows a winding-exchange and therefore tearing cycle.

Figure 3 shows the passage of the ribbon (N) which is in the winding phase and is forming the roll (A). The tape prevents from another machinery, such as an extruder.

The tearing system, as mentioned, provides for the pressure roller 71 which serves to correctly tension the tape during winding. The whole assembly which mounts the roller 71 and the arm 72 is hinged in such a way as to be able to rotate around the point 75 to follow the growth of the roll.

At this point, once a predetermined length of winding has been reached, the exchange phase starts. The whole assembly (71, 72) is raised by rotating and detaching itself from the roll being formed and, at the same time, the block 31 can thus begin its rotation towards the exchange position as in figure 4. In figure 4 it can be seen that the block 31 station a few seconds in a position such that the tips 33, still free, grasp the core which was waiting in the pick-up station 50.

After picking up, the rotation continues up to the position of the new winding, as shown in figure 5. In this phase, the tearing has not yet occurred and the winding of the previous roll which has inverted the position is being completed.

The assembly (71, 72) is again rotated into a position of contact with the core intended for the formation of the new roll.

When the correct footage has been reached, at the end of a count in millimeters selected from an operator panel, the pre-cut 20 moves in synchrony with the feed speed of the material and performs a cross-stitch cut (pre-cut).

At this point, as shown in Figure 6, the tearing of the tape takes place so that the completed roll can be unloaded while a new winding begins.

Figure 6 shows this tear-off phase which is obtained through the rotation of the curved arm 72 which is part of the assembly (71, 72) and the simultaneous exit of the straight arm 76 from the actuator 73. The arm 72, as seen from figure 6, is curved in such a way as to favor the wrapping of the free edge formed around the new core. The combined effect of the straight arm 76 and the curved arm 72 allows tearing along the pre-cut line which straddles the two aforesaid elements.

The completed roll is now unloaded onto the platform 40 and transported away in such a way that the cycle can start again identically again.

The unloading platform 40 is preferably vertically movable and at the same time rotatable.

The vertical motion allows it to be moved away / closer with respect to the section 30 to receive the completed roll. The platform 40, having received the roll, is lowered and then partially rotates in such a way as to make the roll formed fall back onto a conveyor belt or into a collection area.

The machine as described winds up belts that advance continuously.

Claims (10)

CLAIMS 1. A rewinding module (1) for winding a continuous ribbon (N) characterized by the fact that it simultaneously incorporates a pre-cut section (20), a winding and exchange section (30) and a tear-off section (70) of the tape. A rewinder module (1), according to claim 1, in which the pre-cut section is synchronized with the tear section (70) of the web. A rewinding module (1), according to claim 1 or 2, in which the tearing section (70) comprises at least one arm (72, 76) movable towards the passage area of the tape (N), to cause its tear at the pre-cut line. 4. A winding module (1), according to claim 3, in which a first straight arm (76) is provided, operated by a linear actuator (73) and collaborating with a second arm (72) with a curved shape and rotatable around a point (75) of infulcrament o. A winding module (1), according to claim 1 or 2, in which the pre-cutting section comprises a support (2) on which the blade is fixed and movable towards a counter-support (2 '). A rewinding module (1), according to claim 1, in which both the support and the counter-support have a reciprocal approach motion following the direction of advance of the tape. A winding module (1), according to claim 1, wherein the winding and switching section (30) comprises a rotatable block (31) on which at least two winding axes (33, 34) are mounted. A rewinder module (1), according to claim 7, in which the winding and exchange section (30) is synchronized in such a way that before the strip tearing phase there is an exchange phase in which the block ( 31) rotates to a starting position of a new winding and unloading from the completed winding. 9. A method to carry out the winding of a ribbon (N) around a core, the method foreseeing the steps of: Winding the ribbon (N) around a core; Carrying out at least one pre-cutting of the strip consisting of a plurality of material-free portions interspersed with coherent material; Tearing of the tape when a predetermined winding length has been reached around the core; And in which said phases are carried out in a single winder module (10). 10. A method, according to claim 9, in which the winding step of the tape takes place through a winding and exchange section (30) provided with a rotating block (31) on which at least two axes (33, 34) are mounted. winding, and in which, before the strip tearing step, an exchange step is provided in which the block (31) rotates into a position for starting a new winding and unloading from the completed winding.