CH702938A1 - An arrangement for forming a strap loop and method and apparatus for the production of tear-open. - Google Patents

Abstract

When handling a film strip (6) to be unwound from a supply roll (2), which is drawn in step by step by a draw-in device (4), a film loop (7) is produced. So that this can take place without interference at high production cadences, an arrangement (1) is provided in which a hollow cylinder (10) loosely rests with limited freedom of movement to form the belt loop on the belt. Such an arrangement is preferably provided in the manufacture of tear-open lids, in which a foil strip is unwound from a supply roll and fed to a punching and sealing station.

Description

Technical area

The invention relates to an arrangement for forming a belt loop between a unwound drivable tape supply roll and a tape feed device. In particular, the assembly is used in a method of manufacturing tear-open covers, comprising forming a plurality of parallel rows of metal lid rings, progressively conveying the lid members to a plurality of processing stations, and feeding a film strip from a supply roll to the lid rings and punching Film sections and the application and heat sealing of the film sections on the cover rings in a punching and sealing processing station takes place, wherein in the film strip by means of the arrangement a film loop is formed, which comes to rest between the film roll and the collection of the film strip in the punching and sealing processing station. Furthermore, the invention relates to a device for the production of tear-open lids with an arrangement according to the invention.

State of the art

It is known to carry out lid for can or box-like packaging on the top of the package permanently attached metal lid, which form a removal opening, which is closed until the first use of the package contents with a heat-seal applied, tearable film, in particular metal foil , An additional, arranged over the metal lid plastic lid makes the packaging during the period of use for their contents closed again. Devices for producing such metal lid are explained in more detail with reference to FIG. 5. FIGS. 6 to 12 serve to explain manufacturing steps in the production of such covers. The tear-off film is withdrawn during manufacture as a broad film web from a tape supply roll and introduced into the punching and sealing stations or guided over the lid parts. To provide a tape supply for the collection of the film strip in the punching and heat sealing processing station one or more so-called dancer roller systems are used, which however can result in high manufacturing cadences problems in the stepwise film transport, especially in thin film strips. Belt loops of conventional type are produced by the control of the drive of the unwinding tape supply roll and e.g. by means of a distance sensor which measures the distance of the loop from the stationary sensor. For strongly changing pull-in lengths at high belt speeds, this is costly in terms of drive or results in unsatisfactory results. DE-A 4 002 194 proposes forming a belt loop by means of an air flow.

Presentation of the invention

The invention is based on the object to provide an arrangement with which a belt loop can be provided in a simple manner, which operates safely even at high production cadences with gradual tape transport and in a variety of film materials.

This object is achieved with an arrangement according to claim 1.

It has been shown that a stable belt loop can be achieved even under the conditions mentioned by the free movable hollow cylinder, which thus temporarily rests loosely on the tape and forms the lower deflection of the belt loop. In this way, plastic films or laminate films or aluminum foils with belt speeds of 60 meters / min. and stroke from 50 to 150 millimeters per stroke very easy to handle, which allows the use of the arrangement in the production of high-speed tear-open lids.

Preferably passes through the hollow cylinder a horizontal lying, held on both sides in the side walls crossbar, which limits the free mobility of the hollow cylinder. This results in a particularly simple travel restriction for the hollow cylinder. Further, it is preferred that the crossbar is arranged vertically displaceable in each case in a vertical slot guide in the side walls in order to limit the freedom of movement of the hollow cylinder in the vertical direction. The diameter and also the material of the hollow cylinder can be chosen differently. Thus, the diameter can be e.g. 20 cm or larger. As a material in particular plastic comes into question.

The invention is further based on the object to provide a method and apparatus for the production of tear-open, in which the advantageous arrangement is used to achieve the belt loop. This is achieved by the method according to claim 9 or the device according to claim 12.

Preferably, the film strip is horizontally and seen in plan view supplied with its longitudinal direction substantially perpendicular to the conveying direction of the lid parts in the punching and sealing processing station with partially uneven step lengths.

With the rectangular feed of the film web can be achieved in comparison to the conventional oblique feed a film savings of about 20%. However, the straight feed results in more than two parallel rows of lids a widely varying step length of the film strip feed. The stabilization of the film strap loop by means of the arrangement makes it possible to handle the film or large step length variations even at high feed rates.

Short illustration of the drawings

In the following, embodiments of the invention and the production of tear-open is explained in more detail with reference to the drawings. It shows <Tb> FIG. 1 is a schematic side view of an embodiment of an arrangement according to the invention in use between a supply roll and a tape feeder; <Tb> FIG. Fig. 2 shows the arrangement of Fig. 1 with the hollow cylinder lifted from the belt; <Tb> FIG. 3 <sep> the arrangement according to FIG. 1 in a perspective view; <Tb> FIG. Fig. 4 is a side view of the assembly with another position of the hollow cylinder; <Tb> FIG. 5 is a schematic side view of a known device for conveying and producing tear-open lids; and <Tb> FIG. 6 to Fig. 12 <sec> sectors of metal lids for explaining the lid manufacturing.

Ways to carry out the invention

1 to 4 show an embodiment of an inventive arrangement 1. This is provided to form a belt loop 7 in a band 6 and configured. The belt 6 is driven unwound from a supply roll 2 and then passes into the assembly 1. After this, the belt is conveyed by a feeder 4, which belongs to a device in which the belt is used or processed. An example of such a device will be explained below. The unwinding of the tape supply roll is usually carried out at a uniform speed or can be adjusted only relatively slowly via the drive 19 to rapid changes in speed of the intake device 4. In particular, the drawing-in device 4 can bring about a gradual introduction of the strip with changing catchment lengths. The arrangement 1 has the purpose on the belt loop 7 to compensate for the Einzugsschwankungen in speed and / or Einzugsschrittlänge by the loop forms an easily retractable strip material supply. This is known in principle.

There is provided a drive 19 not shown in detail, e.g. is formed by an electric motor. The person skilled in such drives are known, so that no further information must be made here. The drive 19 can be done by the control of the device with the intake device 4 in order to adapt the tape processing to the tape needs. It can also be a sensor 19, in particular in the form of a distance sensor, be provided, whereby the drive 19 can respond to the increase in length or decrease in length of the loop. The sensor signals can be delivered to the controller of the device and processed there for the control of the drive 19 or they can be delivered to a directly associated with the drive control to supplement the control signals from the device.

The arrangement 1 has two side walls 8 and 9, which are e.g. made of plastic or metal. There is a hollow cylinder 10 is provided, which lies on the band and the deflection of the same forms and thus supports the loop formation and thus determines the Abwicklungsreserve. The diameter of the hollow cylinder can be chosen differently. The hollow cylinder may e.g. Made of plastic, in particular polymethyl methacrylate (abbreviated PMMA, colloquially acrylic glass). It is also possible to choose a material with a higher specific weight in order to obtain a greater prestress, e.g. Aluminum. The hollow cylinder preferably has the illustrated circular cross section, but could also have an oval or polygonal cross section. The hollow cylinder is guided substantially flush with its end faces between the side walls, so that it can move freely between the side walls without tilting relative to the side walls. The hollow cylinder is free to a limited extent in its movement, so that it can move freely in the direction of tape travel and perpendicular thereto by a predetermined amount. This amount depends on the diameter and depends on the processing. The restriction of movement can be limited by any means acting on the hollow cylinder. Preferably, this is acted upon from the inside to the hollow cylinder and in particular by a cross bar 11, which is horizontally disposed between the side walls and extends through the hollow cylinder therethrough. The crossbar 11 may be arranged fixed in the side walls or preferably guided vertically displaceable therein. For this purpose, the illustrated vertical slot guides 12, 12 may be provided.

In Figs. 1 and 3, the hollow cylinder 10 is shown in its vertical lowermost position. He lies with his inner wall on the crossbar 11, which in turn is located at the bottom of the slot guides. Now pulls the feeder 4 more tape from, as is handled by the supply roll unwound, so the belt loop shortens, causing the hollow cylinder is deflected from the illustrated bottom layer. He is free in his movement between the side walls. It has been shown that by such a freely movable hollow cylinder, which thus within the free mobility only with its weight (which is adaptable by diameter selection and / or choice of material of the hollow cylinder) rests on the tape and forms the deflection and causes the bias of the tape , even very thin and light foil bands are very good as a loop handle. The free mobility of the hollow cylinder through the band is, however, limited, in the example shown by the crossbar 11. If the path length of the free mobility is used up (resulting here by the inner diameter of the hollow cylinder), contacted in this embodiment, the hollow cylinder first, the crossbar eleventh , whereby his free mobility is used up and is also reduced laterally. This position is shown in Fig. 3. If more ribbon is drawn in than unwound, the hollow cylinder pulls the cross bar upwards. This is clearly visible in FIG. Here, a position is shown in which more tape has been drawn by the retractor 4 for a certain time, as has been supplied by the tape supply roll, so that the loop 7 has shortened so far that the hollow cylinder 10 has been pushed up and while the crossbar 11 has also moved in their slot guides 12, 12 upwards. The upper end of the slot guides 12, 12 would also limit this upward movement. If the feeder device subsequently pulls in less strip than is supplied by the supply roll, or if the drive of the supply roll is adjusted or controlled in such a way that more strip is unwound per unit of time, the loop 7 extends again and the hollow cylinder lying on the strip lengthens moves further down, maximum in the position of Fig. 1 and 2. A further extension of the loop should be prevented by the control of the drive of the supply roll 2, since the tape or the loop 7 without the stabilizing effect of the hollow cylinder the arrangement 1 should run.

In the embodiments shown, the arrangement has an upper inlet side band deflection 14 and an upper outlet side band deflection 15. The tape deflections are arranged at the top of the side walls. The deflections may be rollers that rotate with the tape. But it can also be provided non-rotating deflections. Preferably, adjustable lateral boundaries are provided for the band so that it runs in a defined position over the band deflections 14, 15. In the embodiment shown, axially displaceable and fixable thrust washers 14 and 14 on the band deflection 14 and 15 and 15 on the band deflection 15 are provided on the respective deflection 14 and 15, respectively. These thrust washers, after loosening their attachment, are adjusted in their spacing to the width of the belt and then re-attached to form lateral boundaries for the belt.

As an alternative to the tape guide shown on the inlet-side deflection 14. The arrangement 1, the tape on the inlet side via a deflection 16 (Fig. 3) are guided so that the tape from the supply roll 2 under the guide roller 16 and the hollow cylinder 10 extends ,

The arrangement 1 is preferably fixed by adjustable fastening means 17, 18 to the carriers 5 and 3 for the supply roll 2. The adjustability makes it possible to adjust the spacing of the arrangement 1 in the horizontal direction from the carriers 5, 3.

It will now be explained the preferred use of the arrangement in the production of tear-open. In this case, the tape present on the supply roll 2 is the tear-open film material from which the tear-open film is punched out for each cover. With reference to FIGS. 5 to 12, processing devices and manufacturing steps for the production of metal lids with tear-off foil according to the prior art are briefly explained. FIG. 5 shows a schematic side view of a known device 21, which has a plurality of processing stations 23 to 28 and a further station 29 on a machine frame 22. A conveyor for the lid parts is according to a preferred embodiment, a linear conveyor, as it is known from WO2006 / 042 426. This linear conveyor is designed to promote ceiling-shaped objects of the type described below by means of toothed belt and is suitable for a very rapid promotion and lid production. At the opposite and synchronously moving timing belt opposite receptacles for the cover parts are provided. The conveyor device is used for cyclically conveying the lid parts or covers to the individual processing stations, as will be explained below. The conveying device shown in FIG. 5 conveys the cover parts or the finished cover with tear-off foil in the conveying direction, which is indicated by the arrow C, from the beginning of the device at the stack 31 to the end of the device, where the covers slide over the shelves 36 or 37 arrive. From the stack 31 lid parts are stacked in a known manner and get into the conveyor. The conveying device shown has a different construction than the preferred linear conveyor according to WO2006 / 042 426 and will be explained only briefly here. There are two each individually laterally of the cover parts or cover arranged long rails are provided which raise the shelves or in the stations 23 to 29 cover parts or covers when lifting the rods by means of the drive in the direction A upwards and then by a forward movement in the direction of arrow B (rectified as the arrow C) by the crank drive by an amount forward. Thereafter, the rods are moved in the direction of the arrow A downwards with the lid parts or lids are in turn stored on their filing points. The rods are then moved below the storage positions in the direction of arrow B against the arrow C backwards to then perform the process described again. The cover parts or cover rest between the transport on their storage positions or are located in the processing stations and are processed there. After a processing step of all processing stations, the renewed promotion. FIG. 6 shows stacked metal lid blanks 120 as an example of lid parts as they are in the stack 31. These blanks 120 are e.g. round metal discs of e.g. 11 cm diameter. Of course, other basic forms, e.g. square or rectangular discs and other diameters readily possible. The blanks 120 are already preformed in a processing machine, not shown, at its edge as shown in Fig. 5ge. In Fig. 6 and the following figures, only one sector of the entire disk is shown to simplify the drawings. In the first processing station 23 of Fig. 5, an opening 129 is punched into the disc by a punching operation with upper and lower tool, which can be seen in Fig. 7, in which the edge of the opening is denoted by 121 and the punched round disc with 127th This disc is discharged as waste. The punching processing station 23 is - as is the case with the other stations - driven by a drive 115. At the processing station 24, the edge 121 is pulled down, whereby the course 122 of the edge shown in FIG. 8 is achieved. The annular blank blanks 120 now pass into the stamping and processing station 25, in which the tear film 125 is placed over the opening of the lid 120 and fixed there by heat sealing, which can be seen in Figures 9 and 10. The tearing film 125 is preferably a laminate film or is an aluminum foil and is provided on its underside in a known manner with a plastic layer. The required foil blank 125 is punched out in the station 25 from a wide film web and placed over the central recess of the annular disc and the film is pressed by the heat sealing station under heat at the edge of the circular recess of the part 120 under heat, so that the film 125 with the metal lid 120 is sealed by melting and subsequent cooling of the plastic layer. This is known and will not be explained here. It can also be provided that the tear-open film in the stamping and processing station 25 is only pre-sealed and subsequently sealed in a further heat-sealing station. At most, a cooling processing station 27 may be provided for cooling. In a processing station 28, the film 125 can be provided with a stamping 124 (FIG. 11), and the edge 122 is further crimped to the finished edge 123. In a test station 29, the now finished covers are subjected to a test, which usually includes the below-explained in more detail density test for the applied on the lid liner 25. If the film is tightly attached to the rest of the metal lid, the lid enters the receptacle for the finished lid. If a leak is detected, the lid passes over the other slide shown in the waste container.

With the above-mentioned linear conveying device, the lid parts or lids with a high number of cycles of e.g. 200 objects per minute and be promoted with reproducible steps between stations. There is also a flexible concept for a large format range of the objects or covers, which in the case of round covers, e.g. from a diameter of 50 to 200 mm and also various rectangular formats e.g. for the common fish cans. The conveyor is also designed as a compact module especially for multi-lane construction. In combination with such a production of high cadence lids, the arrangement for forming the belt loop can be used particularly advantageously. However, it can also be used in other devices in which a belt loop must be created.

In the handling of a unwinding of a supply roll film strip, which is gradually retracted into a feeder, a film loop is produced. So that this can take place without interference at high production cadences, an arrangement is provided in which a hollow cylinder loosely rests with limited freedom of movement to form the belt loop on the tape. Such an arrangement is preferably provided in the manufacture of tear-open lids, in which a foil strip is unwound from a supply roll and fed to a punching and sealing station.

Claims (14)

1. Arrangement (1), which is provided and configured to form a belt loop (7) between a unwinding driven tape supply roll (2) and a driven feed device (4) for a gradual introduction of a tape (6), characterized in that the arrangement two side walls (8, 9), between which the band runs, and a hollow cylinder (10), each of which is guided through one of the side walls of the arrangement and freely movable between the side walls to a predetermined extent, the hollow cylinder being intended to to come to rest during operation of the arrangement on the belt (6) and to redirect the belt to the loop (7). 2. Arrangement according to claim 1, characterized in that through the hollow cylinder a horizontally extending, held on both sides in the side walls crossbar (11) which limits the free movement of the hollow cylinder. 3. Arrangement according to claim 2, characterized in that the transverse rod (11) in each case a vertical slot guide (12, 12) in the side walls (8, 9) is arranged vertically displaceable. 4. Arrangement according to one of claims 1 to 3, characterized in that above the side walls of an inlet side and an outlet side band deflection (14, 15) is provided. 5. Arrangement according to one of claims 1 to 3, characterized in that upstream of the side walls a band deflection (16) and the outlet side above the side walls, a band deflection (15) is provided. 6. Arrangement according to one of claims 4 or 5, characterized in that in the band deflections to the width of the band adjustable lateral boundaries (14, 14, 15, 15) are provided for the band. 7. Arrangement according to one of claims 1 to 6, characterized in that said fastening means (17, 18) for attachment to the carrier (3, 5) of the tape supply roll, through which the distance of the arrangement (1) to the supply roll (2) in Belt conveying direction is adjustable. 8. Arrangement according to one of claims 1 to 7, characterized in that it comprises a non-contact sensor (19) for determining the position of the belt loop, in particular a distance sensor for determining the vertical distance of the belt loop from the sensor. A method of making tear-open lids using an assembly according to any one of claims 1 to 8, comprising the steps Forming a series or a plurality of parallel rows of metal lid rings, whereby a stepwise linear conveyance of the lid parts to a plurality of processing stations takes place, - Gradually feeding a film strip from a tape supply roll to the cover rings and punching of film sections and applying and heat sealing the film sections on the cover rings in a punching and sealing processing station, wherein formed in the film strip by the arrangement of a belt loop, which between the tape supply roll and the feeder of the Foil tape in the punching and sealing processing station comes to rest. 10. The method according to claim 9, characterized in that - The film strip is horizontally and seen in plan view with its longitudinal direction substantially perpendicular to the conveying direction of the lid parts in the punching and sealing processing station with partially unequal step lengths is supplied. 11. The method according to claim 9 or 10, characterized in that the stepwise linear promotion of the cover parts takes place on a conveyor with lid part receivers formed by toothed belts and drivers. 12. A device for producing tear-open lids with an arrangement according to one of claims 1 to 8, comprising a conveyor, which is provided for the stepwise, linear promotion of cover parts to a plurality of successive processing stations, including a punching and sealing processing station is provided, which Punching of film sections as well as for applying and heat sealing of the film sections is configured on the lid rings, and a film strip feeder, which is provided for the stepwise feeding a film strip from a supply roll to the punching and sealing processing station, the device being able to produce a film belt loop which is located between the supply roll and the entry of the film web comes to lie in the punching and heat sealing processing station. 13. The apparatus according to claim 12, characterized in that the film strip feed is arranged such that the film strip horizontally and seen in draufsieht 'with its longitudinal direction substantially perpendicular to the conveying direction of the lid parts in the punching and sealing processing station can be fed. 14. The apparatus of claim 12 or 13, characterized in that for the stepwise linear promotion of the lid parts a conveyor is provided with formed by toothed belt and drivers cover part recordings.