ES2539718T3 - Arrangement to form a loop of tape and procedure and device for manufacturing tear caps - Google Patents

Abstract

Arrangement (1) that is provided and configured to form a tape loop (7) between a tape stock roll (2) driven for unwinding and a driven input equipment (4) for performing step-by-step input of a tape (6), characterized in that the layout has two side walls (8, 9), between which the tape runs, and a hollow cylinder (10) that is guided on the front side by each of the side walls of the layout and can move freely between the side walls to a predetermined extent, the free mobility of the hollow cylinder being limited by a horizontal cross bar (11) which is attached on both sides to the side walls and runs through the hollow cylinder, being intended the hollow cylinder to come to rest on the tape (6) during the operation of the arrangement and to deflect the tape to form the loop (7), the hollow cylinder (10) resting only with its weight on the tape.

Description

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DESCRIPTION

Arrangement to form a loop of tape and procedure and device for manufacturing tear caps

Field of the Invention

The invention relates to an arrangement for forming a loop of tape between a roll-up roll of actionable tape for unwinding and a tape introduction equipment. In particular, the arrangement is used in a process for manufacturing tear-off caps, which comprises the formation of several parallel rows of metal cover rings, in which a step-by-step transport of the cover pieces to several machining stations is carried out. and a step-by-step feeding of the film tape from a roll of tape stock to the cover rings and the die-cutting of film segments, as well as the application and hot stamping of the film segments on the cover rings in a stamping and sealing machining station, a loop of film tape being formed between the roll of film tape and the insertion point of the film is formed on the film tape by means of a hollow cylinder of the arrangement. film tape in the stamping and sealing machining station. In this case, a movement of the hollow cylinder is limited by means of a crossbar. Also, the invention concerns a device for manufacturing tear-off lids with an arrangement according to the invention.

Background

It is known to build caps for cans or cans as metal caps permanently fixed on the upper side of the container, which form an extraction opening that is closed until the first use of the contents of the container with a tear-off film, especially a metal film, applied by hot stamping. An additional plastic lid disposed on the metal lid allows the container to be closed again while the consumption of its contents lasts. Next, devices for the manufacture of such metal covers are explained with the aid of Figure 5. Figures 6 to 12 serve to explain manufacturing steps during the manufacturing process of such covers. The tear-off film is removed from a roll of tape stock in the form of a wide film band during manufacturing and introduced into the stamping and sealing stations or conducted until it is left on top of the cover pieces. In order to provide a stock of tape intended for the introduction of the film tape into the hot stamping and stamping machining station, so-called single or multiple touch roller systems are used which, however, can cause problems during transport. passing the film at high manufacturing rates, especially also in the case of thin film tapes. Conventional-class tape loops are produced by controlling the drive of the tape reserve roll being unwound and are regulated, for example, by means of a distance sensor that measures the loop distance to the stationary sensor. For strongly changing lengths of introduction at high speed of the belt this is complicated in terms of drive or yields insufficient results. In DE-A 40 02 194 it is proposed the formation of a tape loop by means of an air current.

US 4 842 681 discloses a device in which a tape of material is unwound from a reserve roll and processed in another installation. Between the reserve roll and the installation, the material tape is conducted with a loop that is obtained by causing a cylinder to act on the tape in order to reduce or increase the extension of the loop.

Document DE 43 27 670 A1 discloses a device in which a film is unwound from a reserve winder and cut into a cutting machine, a loop of the film tape being formed in between. In this case, a bar is placed on the film tape that is vertically movable on rails by means of suitable supports to increase or reduce the extent of the loop. The vertical path of the bar is then monitored by means of sensors, with which an upper travel limit and a lower travel limit of the bar are defined.

Exhibition of the invention

The invention is based on the problem of creating an arrangement with which a loop of tape can be provided in a simple manner and that works safely even at high manufacturing rates with belt transport step by step and with the most different materials of movie.

This problem is solved with an arrangement according to claim 1.

It has been seen that, by means of the freely movable hollow cylinder within limits, which thus looses temporarily loose on the tape and forms the lower deviation of the tape loop, a stable tape loop can be achieved even under the aforementioned conditions. In this way, plastic films or laminate films or aluminum films with belt speeds of 60 meters / min and introductory strokes of 50 to 150 millimeters per stroke can also be handled very well, which makes it possible to use the provision in manufacturing

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of tear caps with high cadence.

Since a horizontally located crossbar and secured to both sides on the side walls runs through the hollow cylinder, which limits the free mobility of the hollow cylinder, an especially simple travel limitation for the hollow cylinder is obtained. It is preferred that the crossbar be arranged vertically movable on vertical groove guides provided on the side walls 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 chosen, for example, 20 cm or more. The material is especially considered plastic.

The invention is also based on the problem of creating a method and a device for manufacturing tear-off caps in which the advantageous arrangement is used to achieve the tape loop. This is achieved with the method according to claim 8 and with the device according to claim 11.

Preferably, seen horizontally and in plan view, the film tape, viewed horizontally and in plan, and with its longitudinal direction substantially perpendicular to the transport direction of the cover pieces, is fed in this case to the machining station of stamping and sealing with partially uneven passage lengths.

A film saving of approximately 20% can be achieved compared to conventional oblique feeding with the right angle feed of the film strip. However, straight feeding results, in the case of more than two rows of parallel produced caps, a strongly fluctuating passage length of the film tape feed. The stabilization of the film tape loop by means of the arrangement makes it possible in this case the handling of the film or large fluctuations of the passage length even at high feed rates.

Brief description of the drawings

In the following, examples of embodiments of the invention and the manufacture of tear-off lids are explained in more detail using the drawings. They show in these:

Figure 1, a schematic side view of an exemplary embodiment of an arrangement according to the invention in use between a tape reserve roll and a tape insertion point;

Figure 2, the arrangement of Figure 1 with the hollow cylinder raised from the belt;

Figure 3, the arrangement according to Figure 1 in a perspective representation;

Figure 4, a side view of the arrangement with another position of the hollow cylinder;

Figure 5, a schematic side view of a known device for transporting and manufacturing tear caps; Y

Figure 6 to Figure 12, sectors of metal covers to explain the manufacture of said covers.

Embodiment (s) of the invention

Figures 1 to 4 show an exemplary embodiment of an arrangement 1 according to the invention. This is provided and configured to form a loop of tape 7 on a tape 6. The tape 6 is unwound in a driven manner from a roll of tape stock 2 and then arrives at the arrangement 1. After this, the tape is transported by an introduction device 4 belonging to a device in which the tape is used or processed. An example of this device is explained below. The tape direction D of the belt is the result of the tape transport represented. The unwinding from the tape reserve roll is generally carried out with a uniform speed or can be adapted only relatively slowly, via drive 19, to rapid variations in the speed of the introduction equipment 4. In particular, the Introduction 4 can produce a step-by-step introduction of the tape with changing introduction lengths. The arrangement 1 has in this case the mission of compensating, by means of the loop of tape 7, the fluctuations of introduction in speed and / or length of introduction step forming for this the loop a reserve of material of slightly retractable tape. This is basically known.

A drive 19, not shown in detail, is provided, which is formed, for example, by an electric motor. These drives are known to the expert, so there is no need to give more information about them here. The drive 19 can be carried out by the device controller with the introduction equipment 4 to adapt the unwinding of the tape to the demand of the tape. A sensor 19 'may also be provided, for example in the form of a distance sensor, whereby the drive 19 can react to the increase in length or the decrease in length of the loop. The sensor signals can be delivered to the device controller and can be treated there for control of the drive 19 or can be delivered to a controller

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directly associated with the drive to complement the control signals that come from the device. The arrangement 1 has two side walls 8 and 9 consisting, for example, of plastic or metal. Between these side walls the belt runs and this forms the loop 7 there. A hollow cylinder 10 is provided that rests on the tape and forms the deviation thereof and thus favors the formation of the loop and, therefore, determines the unwinding reserve . The diameter of the hollow cylinder can be chosen differently. The hollow cylinder may consist, for example, of plastic, especially polymethylmethacrylate (PMMA abbreviation, in the current language acrylic glass). A material with a higher specific weight can also be chosen to achieve a higher prestress, for example aluminum. The hollow cylinder preferably has the circular cross-section depicted, but could also have an oval or polygonal cross-section. The hollow cylinder is guided with its front sides substantially beams between the side walls, so that this cylinder can move freely between the side walls, without tilting with respect to the side walls. The hollow cylinder here has a limited degree of freedom in its movement, so that it can move freely in a predetermined amount in the direction of movement of the belt and perpendicular to it. This amount depends on the diameter and the unwind. The limitation of movement can be restricted with the help of means of any kind acting on the hollow cylinder. To this end, the hollow cylinder is operated from within by means of a crossbar 11 that is arranged horizontally between the side walls and extends through the hollow cylinder. The cross bar 11 can be fixedly arranged on the side walls or can preferably be guided in a vertical direction. For this purpose, the vertical groove guides 12, 12 'shown may be provided.

In Figures 1 and 3 the hollow cylinder 10 is shown in its vertically lowest position. In this case, said cylinder rests with its inner wall on the crossbar 11, which in turn is located entirely below the groove guides. If the introduction equipment 4 now removes more tape than the one that is unwound in a driven manner from the reserve roll, then the tape loop is shortened, thereby diverting the hollow cylinder out from the lowest position shown. Said cylinder then has freedom in its movement between the side walls. It has been seen that, by means of a freely movable hollow cylinder of this kind which, within free mobility, thus rests only with its weight (which is adaptable by the choice of the diameter and / or the choice of the material of the hollow cylinder) on the tape and forms the deviation of this and produces the prestressing of the tape, very thin and light film tapes can be handled equally well as loops. Therefore, the free mobility of the hollow cylinder through the belt is limited by the crossbar 11. When the travel length of the free mobility (resulting here due to the inner diameter of the hollow cylinder) has been consumed, the hollow cylinder first contact the crossbar 11 in this exemplary embodiment, whereby its free mobility is exhausted upwards and also reduced laterally. This position is represented in Figure 3. If more tape is still introduced than the unwind, the hollow cylinder then pulls the crossbar upwards. This can be seen well in Figure 4. A position is shown here in which for a certain time more tape has been introduced by the introducing equipment 4 than the one supplied by the tape reserve roll, so that it has shortened the loop 7 to the point that the hollow cylinder 10 has been pressed upward and then has also moved the crossbar 11 upward in its slit guides 12, 12 '. The upper end of the slit guides 12, 12 'would also limit this upward movement. If the introduction equipment then introduces less tape than the one supplied by the reserve roll, or the reserve roll drive is adjusted in a controlled or regulated manner so that more tape is unwound per unit of time, then the loop 7 and the hollow cylinder located on the belt moves down again, at most to the position of figures 1 and 2. An additional lengthening of the loop must be prevented by the controller of the drive of the reserve roll 2, since the tape or loop 7 must not run through arrangement 1 without the stabilizing action of the hollow cylinder.

In the embodiments shown, the arrangement has an upper belt offset 14 on the input side and an upper belt offset 15 on the output side. The tape deviations are arranged here on the upper side of the side walls. The deviations can be rollers that rotate together with the tape. However, non-rotating deviations may also be provided. Preferably, lateral limitations are provided for the belt so that it runs in a defined position on the belt deviations 14, 15. In the embodiment shown, respective attack discs are provided for this purpose in the respective deviation 14 and 15. axially movable and immobilizable 14 'and 14' 'on the belt deviation 14 and discs 15' and 15 '' of the same class on the belt deviation 15. These attack discs, after releasing their fixation, adjust to their distance to the width of the tape and then fixed again, thereby forming some lateral limitations for the tape.

As an alternative to the tape guidance shown on the deviation 14 of the input side of the arrangement 1, the tape can also be guided on the input side of a deviation 16 (Figure 3), so that the tape runs from the roll of reserve 2 below the deflection roller 16 and up to the hollow cylinder 10. The arrangement 1 is preferably fixed by adjustable fixing means 17, 18 to the supports 5 and 3 for the reserve roll 2. The adjustability makes it possible in this in case of adjusting the distance of the arrangement 1 to the supports 5, 3 in the horizontal direction. The preferred use of the arrangement in the manufacture of tear-off lids is now explained. In this case, the tape present in the tape reserve roll 2 is the tear film material in which the tear film for each lid is punched. With the help of figures 5 to 12, some machining equipment is briefly explained and

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manufacturing steps for the production of metal covers with a tear-off film according to the state of the art. Figure 5 shows in this respect a schematic side view of a known equipment 21 presenting on a machine frame 22 several machining stations 23 to 28 and an additional station 29. A transport equipment for the cover pieces is, according to a Preferred embodiment, a linear transport equipment, such as this is known from WO2006 / 042426. This linear transport device is configured for the transport of lid-shaped objects of the class then exposed by means of toothed belts and is suitable for transporting or manufacturing caps very quickly. In the opposite toothed belts and moved in synchronism mutually opposite housings are provided for the cover pieces. The transport device is used for intermittent transport of the cover pieces or of the covers to the different machining stations, as explained below. The transport device shown in Figure 5 transports the cover pieces or the end caps with a film that can be started in the direction of transport, which is indicated by arrow C, from the beginning of the equipment in stack 31 to the end of the equipment , where the covers reach the trays 36 or 37 through inclined planes. The cover pieces are unstacked from the stack 31 in a known manner and arrive at the transport equipment. The transport device shown has a different construction from that of the preferred linear transport equipment according to WO2006 / 042426 and is only briefly explained here. In this case, two long rails are provided, each individually arranged on one side of the cover pieces or the covers, which, by raising the bars by means of the drive in the direction A upwards, raise the cover pieces. or the covers located on trays or at stations 23 to 29 and then move them with a crank drive in a certain amount forward by a forward movement in the direction of arrow B (oriented in the same direction as arrow C ). Next, the bars are moved down in the direction of arrow A, the cover pieces or the caps being deposited again on their deposition sites. The bars are then moved backward in the direction of arrow B opposite to arrow C below the deposition positions to then perform the described process again. The cover pieces or the caps rest between the transport on their deposition positions or are in the processing stations and are processed there. After a processing step of all the processing stations the new transport is carried out. Figure 6 shows stacked sheet metal blanks 120 as examples of sheet metal parts, such as these are presented in stack 31. These blanks 120 are, for example, metal discs of, for example, 11 cm in diameter. Naturally, other basic shapes, for example square or rectangular discs, and other diameters are possible without difficulties. The blanks 120 have already been preformed at their edge, as shown in Figure 5, in a processing machine not shown. In figure 6 and in the following figures, only one sector of the complete disk is shown each time to simplify the drawings. In the first processing station 23 of Figure 5 an opening 129 is punched in the disk by means of a die-cutting processing with upper and lower useful, which can be seen in Figure 7, in which the edge of the opening and with 127 the round disc die cut. This disk is evacuated as waste. The punching processing station 23 is driven - as is the case with the other stations as well - by a drive 115. In the processing station 24 a traction of the edge 121 is carried out downwards, whereby tracing 122 of the edge is achieved shown in Fig. 8. The annular lid blanks 120 now arrive at the die-cutting and processing station 25, in which the tear film 125 is placed over the opening of the lid 120 and fixed there by sealing in hot, which can be seen in Figures 9 and 10. The tear film 125 is preferably a laminate film or an aluminum film and, in a known manner, is provided with a plastic layer on its lower side. The necessary film cutout 125 is punched out and separated from a wide film band at station 25 and placed on the central recess of the annular disc and, by means of the hot stamping station, the film is pressed under heat action against the edge of the round recess of the piece 120, whereby the film 125 is tightly joined with the metal cover 120 by melting and subsequent cooling of the plastic layer. This is known and is not explained here in more detail. It can also be provided that the tear-off film is previously sealed only in the stamping and processing station 25 and then its definitive sealing is carried out in another hot stamping station. For cooling, a cooling processing station 27 may be provided in any case. In a processing station 28, the film 125 can be provided with a print 124 (FIG. 11), and the edge 122 is further beaded to obtain the finished edge 123. In a test station 29, the now finished covers are subjected to a test which generally comprises the tightness check explained below with more precision for the tear film 25 applied on the cover. When the film is tightly fixed on the remaining metal cover, this cover then reaches the housing for the finished covers. If a lack of tightness is detected, the lid then reaches the waste container through the other inclined plane shown.

With the above-mentioned linear transport device, the cover pieces or the covers with a high number of cycles of, for example, 200 objects per minute and with reproducible partial passages between the stations can be transported. It is also a flexible concept for a large format range of objects or covers that can be extended in round covers, for example, from a diameter of 50 to 200 mm, and can also accommodate various rectangular formats, for example for fish cans currents The transport device is also designed as a compact module especially for multipath construction. In combination with this manufacture of caps with high cadence, the arrangement can be used in an especially advantageous way to form the tape loop. Therefore, it can also be used in other devices

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in which a loop of tape has to occur.

During the handling of a film tape that must be unwound from a reserve roll and introduced step by step in an introduction device, a film tape loop is generated. So that this can be done without disturbances at high manufacturing rates, an arrangement is provided in which a hollow cylinder

5 rest loose on the tape with limited freedom of movement to form the tape loop. This arrangement is preferably provided in the manufacture of tear-off lids in which a film tape is unwound from a reserve roll and this tape is fed to a stamping and sealing station.

Claims (13)

5 10 fifteen twenty 25 30 35 40 Four. Five fifty 1. Arrangement (1) that is intended and configured to form a tape loop (7) between a tape reserve roll (2) actuated for unrolling and driven introduction equipment (4) to perform a step-by-step introduction of a belt (6), characterized in that the arrangement has two side walls (8, 9), between which the belt runs , and a hollow cylinder (10) that is guided on the front side by each of the side walls of the arrangement and can move freely between the side walls in a predetermined measure, the free mobility of the hollow cylinder being limited by a crossbar horizontal (11) that is attached to both sides on the side walls and that runs through the hollow cylinder, the hollow cylinder being intended to be placed on the belt (6) during operation of the arrangement and to divert the tape to form the loop (7), resting the hollow cylinder (10) only with its weight on the belt.

2.

Arrangement according to claim 1, characterized in that the transverse bar (11) is arranged vertically movable on vertical groove guides (12, 12 ') provided on the side walls (8, 9).

3.

Arrangement according to any one of claims 1 and 2, characterized in that a deviation of tape from the input side and a deviation of tape from the output side (14, 15) are provided above the side walls.

Four.

 Arrangement according to any one of claims 1 and 2, characterized in that a deviation of tape (16) is provided on the inlet side in front of the side walls and a tape arrangement (15) on the outlet side above the walls lateral.

5.

Arrangement according to any of claims 3 or 4, characterized in that lateral limitations (14 ', 14' ', 15', 15 '') are arranged in the belt deviations for the tape that can be adjusted to the width of said tape .

6.

 Arrangement according to any one of claims 1 to 5, characterized in that it has fixing means (17, 18) for fixing it to the support (3, 5) of the ink reserve roll, with the aid of which the distance can be adjusted from the arrangement (1) to the tape reserve roll (2) in the tape transport direction.

7.

 Arrangement according to any one of claims 1 to 6, characterized in that it comprises a contactless sensor (19 ') for acquiring the position of the tape loop, especially a distance sensor for acquiring the vertical distance of the tape loop to the sensor.

8.

 Method for manufacturing tear-off caps using an arrangement according to any one of claims 1 to 7, comprising the steps of

-formation of a row or several parallel rows of metal cover rings, making a step-by-step linear transport of the cover piece to several processing stations, Step-by-step feed of a film tape from a roll of tape stock to the cover rings and die cut of film segments, as well as applications and hot stamping of the film segments on the cover rings at a station stamping and sealing processing, being formed by the arrangement in the film tape, by means of a hollow cylinder (10) of the arrangement, a loop of tape that is to be located between the tape reserve roll and the point of introduction of the film tape into the stamping and sealing processing station, a movement of the hollow cylinder being limited by a transverse bar (11) that is arranged horizontally between the side walls of the arrangement and extends through the hollow cylinder.

9.

 Method according to claim 8, characterized in that

-the film tape, viewed horizontally and in plan, and with its longitudinal direction substantially perpendicular to the transport direction of the cover pieces, is fed to the stamping and sealing processing station with partially uneven passage lengths.

10.

 Method according to claim 8 or 9, characterized in that the step-by-step linear transport of the cover pieces is carried out on a transport equipment with housings of cover pieces formed by toothed belts and dragging elements.

eleven.

 Device for manufacturing tear-off lids with an arrangement according to any one of claims 1 to 7, comprising a transport equipment that is intended for step-by-step linear transport of cover pieces to several consecutive processing stations, among which a stamping and sealing processing station that is configured to punch film segments, as well as to apply and heat seal the film segments on the cover rings, and a film tape feed that is intended to feed step by step a film tape from a tape reserve roll to the stamping and sealing processing station, a loop of film tape being able to be placed between the tape reserve roll and the point of introduction of the tape can be produced by the arrangement. movie band in the

7 hot stamping and die processing station. 12. Device according to claim 11, characterized in that the film tape feed is arranged such that the film tape, seen horizontally and in plan, and with its longitudinal direction substantially perpendicular to the transport direction of the parts of lid, can be fed to the station 5 stamping and sealing processing. 13. Device according to claim 11 or 12, characterized in that, for the step-by-step linear transport of the cover pieces, a transport equipment is provided with housings of cover pieces formed by toothed belts and towing elements. 10 8