DE102021103029A1 - Device for removing punched parts - Google Patents

Abstract

The invention relates to a device for removing a punched-out part (13) from a punching device (10), wherein the parts are punched from an endless web of a film and discharged through an output opening in the die (21), the punched-out part (13) through an insertion opening reaches a magazine (15).
The invention is characterized in that the device has at least one holding part with an outer surface (7), that the outer surface (7) has at least one suction area (19) which is in operative connection with a negative pressure source (vacuum source), that the holding part is movable along a path from the dispensing opening to the introduction opening, in the area of which the punched-out part (13), preferably by a stripping surface (16), is stripped from the holding part and fed to the introduction opening.

Description

The invention relates to a device for removing punched parts from a punching device, according to the preamble of claim 1.

• - Aluminium in Kombination mit einem Siegelmedium, Siegelmedien können sein Heißsiegellacke oder siegelfähige Coexbeschichtungen;
• - Polyester (PET) in einer oder mehreren Lagen mit einer Siegelbeschichtung;
• - Kombinationen von Papier mit Kunststoff, zum Beispiel PET/Papier/PET;
• - Papier (insbesondere bei papierhältigen Folienbahnen kann die maximale Dicke erreicht werden) mit zumindest einer Sperrschicht;
• - kompostierbare Kunststoffe wie PLA; auch in den oben genannten Kombinationen mit Kunststoffen;
• - laminierte Aluminiumfolien, gegebenenfalls mit Kunststofffolie(n) oder Papier kaschiert,
• - auch Aluminium / Aluminium Verbunde sind denkbar,
• - ebenso mehrlagige V, bei 2-Schicht Verbund spricht man von Duplex, bei 3-Schichten von Triplex Verbundfolien.

The punching device to which the invention relates in particular punches parts, so-called blanks, which are used to close yoghurt cups, coffee capsules and other containers from continuous material which is in the form of a film. The thickness of the endless web is less than 0.5 mm, mostly far less. The foils are mainly structured as follows:

• - Aluminum in combination with a sealing medium, sealing media can be heat sealing lacquers or sealable coex coatings;
• - Polyester (PET) in one or more layers with a sealing coating;
• - combinations of paper with plastic, for example PET / paper / PET;
• - Paper (especially with paper-containing film webs, the maximum thickness can be achieved) with at least one barrier layer;
• - compostable plastics such as PLA; also in the above-mentioned combinations with plastics;
• - Laminated aluminum foils, possibly laminated with plastic foil (s) or paper,
• - Aluminum / aluminum composites are also conceivable,
• - also multi-layer V, with 2-layer composite one speaks of duplex, with 3-layer of triplex composite film.

All of these foils can be printed, both in mirror and frontal printing.

In the prior art, the punched-out part, the board, is pressed by the punch into a through opening, the punching opening, of the die and forms a growing stack in this, consisting of the punched-out parts. On the outside of the die, where the through opening forms an output opening, a magazine is attached with an inner shape that corresponds to the circumferential shape of the punched parts, and in which a movable, variously spring-loaded or otherwise guided stop is provided, if necessary. The bottom of the stack of punched-out parts rests against the stop; and it is either moved by the punching force, or it is moved accordingly from the outside. If a sufficiently high (thick) stack has been formed in this magazine, depending on the experience of the user, punched parts in the appropriate height, thus estimated number, are removed by hand, the stamp is brought back into the adjacent position and if necessary all of this takes place either without or with only a brief interruption in the punching process.

For the punching process itself, it should only be stated that usually several rows of parts to be punched out, offset from one another in the direction of movement, are provided from the cyclically moved endless material in order to utilize the endless material as much as possible. In doing so, attention is paid to the pressure, etc. that has already been applied; all of this is known in the prior art and therefore does not require any further explanation here.

The main disadvantage of this procedure known from the prior art is that the number of manually removed parts can never be precisely determined, and that it is therefore necessary for the manufacturer to work with a certain safety margin in order to avoid complaints, and that this leads to a significant loss of profitability. Another set of problems concerns the necessary manual handling of the removed stack itself, because despite the use of gloves and breathing masks, in rare cases, but inevitably, individual parts are contaminated, which is disadvantageous in subsequent use, practically exclusively in connection with food is. Any kind of late removal of a sufficiently grown stack either leads to an emergency stop of the punching device as a whole or, even worse, to overflowing of the stack or to problems with the punching itself when the stack "grows back" into the punching form, the foil deformed or damaged and thus also interferes with the punching of the other webs.

There is thus a great need for a device which avoids these disadvantages and it is the aim and object of the invention to provide such a device.

The object according to the invention is achieved by a device which has the features specified in the characterizing part of claim 1. In other words, a device is attached to the outside of the punch in the area of the dispensing opening which moves a holding part with an outer surface past the dispensing opening, the outer surface having at least one area which is in operative connection with a negative pressure source (vacuum source) stands (suction area), whereby a board located in the dispensing opening is sucked in and placed against it, and the outer surface including the adjacent Board is moved from the dispensing opening to a delivery area, where the board, preferably by a stripping surface, is stripped from the outer surface and arrives in a magazine.

In the application and the claims, the term negative pressure source means that it has the effect that an air pressure below ambient pressure always prevails in the at least one area of the outer surface during the operative connection.

• In der ersten Variante weist die Vorrichtung zumindest einen Arm auf, der mit einer Welle um deren, bevorzugt horizontale, Achse drehbar gelagert ist und an seinem freien Ende entweder selbst, oder in Form eines aufgesetzten Kunststoffteils, die äußere Oberfläche aufweist, wobei diese durch den Arm und die Welle hindurch mit der Unterdruckquelle in Verbindung steht.

These features can essentially be achieved by two types of devices:

• In the first variant, the device has at least one arm which is rotatably mounted with a shaft about its, preferably horizontal, axis and at its free end either itself or in the form of an attached plastic part, has the outer surface, this being through the Arm and the shaft through with the vacuum source in communication.

When using a plastic part, the arm has an end face which preferably runs approximately tangentially to the axis and is either flat or cylindrical, with generatrices approximately parallel to the axis of rotation of the arm.

In a variant, the arms can be designed to be radially divided, the outer part being designed to be pivotable within limits with respect to the inner part, as a result of which the circumferential speed of the suction area can be well controlled.

In the second variant, the outer surface is formed on a plate or plate-shaped part, which is moved past the dispensing opening in a guide, for example by means of a toothed belt, and is guided to the dispensing area. There, after the board has been dispensed, the small plate is moved back to the dispensing opening, with an intermediate storage facility possibly being arranged in order to be able to easily and quickly exchange one type of plate for another type of plate.

The generally preferred clocking of the movement can be achieved by appropriate transfer of the platelets to different transport devices in the individual sections of their movement path, which has the advantage that only individual platelets have to be delayed and accelerated again. A certain disadvantage is the not so simple supply of vacuum, but this can be done by the individual transport devices where it is necessary along the path of movement, and otherwise be dispensed with without disadvantages.

More about the first embodiment:

If the arm is now, preferably clocked, with the standstill or strong deceleration, then when the end face is in the area of the dispensing opening, is rotated around its axis, the respective foremost plate (the punched piece) remains on the due to the negative pressure hanging on the outer surface and is guided by the further rotation to the delivery area, in which it is stripped from the surface and, due to the circumferential speed, slides approximately tangentially, preferably along a guide surface, into the magazine.

The cycle of the arm movement can, but does not have to be, matched to the cycle of the punching device. For example, a slightly higher number of cycles can be provided in order to facilitate and make possible a time reservoir for changing the magazine when the arm is stationary, without having to stop the punching device.

Clocked is understood to mean that the rotation of the shaft is always briefly stopped or at least almost stopped when the outer surface of the arm is essentially in the center (in the area of the centroid) of the punched-out part, so that the suction and adhesion can take place, without causing a (disruptive) sliding movement. As a result, the relative position between the punched-out part and the surface of the arm is determined with sufficient accuracy, and is maintained even when the punched-out part is accelerated and transported.

Since there are punching rates with a cycle rate of up to 500 / min, it is not possible to get by with just one arm on the shaft, and in one embodiment of the invention it is therefore provided that several arms are provided, evenly distributed around the shaft , of course, are always in the same plane normal to the shaft. Excellent results were achieved with six-armed devices in which the offset in the circumferential direction was 60 ° in each case, which requires the shaft and arms to stop six times per revolution, something that is not a problem with stepper motors or the like even at the necessary speeds.

For reasons of strength and ease of processing, turning, milling, wire erosion, etc. from an aluminum disc is the preferred manufacturing method, whereby aluminum (or aluminum alloy), due to its low density, also favors the necessary acceleration and stopping compared to stainless steel or other materials. The use of plastic is possible, but because of the more complex In comparison to aluminum, production only makes sense in special cases.

For better adhesion of the punched parts and to reliably prevent their unwanted contact with aluminum, as is often required, the actual contact surface (= surface of the arm) is optionally formed from a layer of food-grade plastic (silicone, NBR, PUR), which is clamped, screwed or otherwise fastened onto the aluminum part of the arm, whereby either a distribution of the suction channels can also be provided in the plastic part, or channels that are aligned with the openings provided for this purpose in the aluminum part and run essentially radially are provided. Instead of individual clamping parts on the respective arm, it is also possible to form a ring, possibly with a suitably structured inner surface, complementary to the end faces.

• die 1 eine Axialansicht einer erfindungsgemäßen ersten Ausbildung, teilweise im Schnitt,
• die 2 einen Schnitt entlang der Linie II-II der 1,
• die 3 eine Ansicht in die Richtung des Pfeiles III der 1,
• die 4 eine perspektivische Ansicht,
• die 5 eine Seitenansicht der gesamten Vorrichtung, z.T. im Schnitt,
• die 6 eine Ausgestaltung der ersten Variante an einer Stanze, teils im Schnitt und
• die 7 die zweite Ausführungsform.

The invention is explained in more detail below using an exemplary embodiment of the first embodiment and with reference to the accompanying drawing. It shows, or show,

• the 1 an axial view of a first embodiment according to the invention, partially in section,
• the 2 a section along the line II-II of 1 ,
• the 3 a view in the direction of arrow III of FIG 1 ,
• the 4th a perspective view,
• the 5 a side view of the entire device, partly in section,
• the 6th an embodiment of the first variant on a punch, partly in section and
• the 7th the second embodiment.

the 1 shows a view in the axial direction of a shaft on which a removal wheel 1 with six arms 2 is mounted. There is an opening in the center 3 recognizable, which is used to attach to the (not shown) shaft. The six arms 2 are connected to each other by a stabilizing ring 4th connected to increase mechanical stability and prevent vibrations. At the outer end point the arms 2 Heads 5 on that for attaching plastic supports 8th serve, which in turn come into contact with the stamped parts to be removed. In the exemplary embodiment shown, approximately U-shaped plastic parts (support 8th ) over the central areas of the heads 5 attached and by means of elastically deformable terminal strips 9 in the U-shaped recesses of the respective head 5 fixed by frictional engagement. This has proven to be easy to replace and therefore easy to clean after it has been removed.

In the partial section, one of the arms is inside 2 a longitudinal hole 6th can be seen from the central opening 3 up to the face 11 of the arm, below (within) the support 8th made of plastic, is enough.

the 2 represents a section along the line II-II of FIG 1 represent the longitudinal holes 6th are just like the thin editions 8th and the central opening 3 clearly visible.

the 3 , a view in the direction of arrow III of FIG 1 , shows the one with multiple suction openings 12th provided outer surfaces 7th of the requirements 8th . The branch from the longitudinal bore 6th The suction openings are preferably carried out through grooves in the end face, which through the inner surface of the supports 8th become channels that lead to the individual suction openings 12th and in total the suction area to be acted upon with vacuum (negative pressure), possibly also with overpressure 19th form.

the 4th Figure 3 illustrates an embodiment of the invention in perspective view, the arms 2 , the ring 4th who have favourited suction openings 12th and the terminal strips 9 can be clearly seen.

the 5 shows, schematically and partially in section, the arrangement of a removal wheel 1 on a punching device 10 , of which only the area where the punched parts, the sinkers 13th , a stack 14th in the through opening of the die 21 form up to the dispensing opening is shown. For the sake of simplicity, the punching plane is shown oriented vertically, but in practice it is mostly inclined “backwards” so that the punching tool performs a downward movement with one component in the working direction.

It is the moment of contact with one of the outer surfaces 7th with the foremost board of the stack 14th shown without loss of generality with a horizontal arm 2 and vertical position of the boards in the stack 14th . The direction of rotation of the wheel 1 is indicated by arrow D, for the sake of clarity, no board is shown on the neighboring arm; only again on the arm, which is the area of a magazine 15th is close, one is drawn in. This board protrudes several times over the width of the outer surface on both sides of the plane of the drawing 7th and is from one either side of the outer surface 7th provided sliding surface 16 , which can be part of the magazine or, preferably, is fixedly arranged on the removal device, in the movement of the outer surface 7th detached and through their momentum moves along the sliding surface 16 into the magazine 15th where the pile already formed 20th is indicated by corresponding hatching. The clear dimensions of the magazine correspond at least essentially to those of the output opening of the punching device. In practice that is Length of the magazine 15th mostly significantly longer to accommodate a larger number of boards 13th to be able to record.

The timing of the movement of the wheel 1 facilitates the precise counting of the blanks removed and, when the desired number of pieces is reached, stops the removal and thus enables the magazine to be changed. After the magazine has been changed, blanks are removed again at greater speed than are punched, the stack 14th becomes "airier" and the game repeats itself.

The situation in the area of removal from the stack can be varied in different ways and adapted to the circumstances. Thus, a retaining device for the blanks is preferably provided at the end of the punching device in the area of the dispensing opening, which allows the arm to pass through in a suitable (radial) size and thus ensures that removal conditions are always the same. It can also be stacked when the wheel is stationary (removal of the magazine) 14th directed arm 2 also support this, namely in the central area of its end face.

A configuration of this embodiment is shown in FIG 6th depicted showing a situation similar to that of the 5 shows: The die 21 the punch is together with the passage opening 18th shown, as well as the stack currently being formed in the passage opening 20th . The removal wheel 1 points in the configuration on the stabilizing ring 4th Joints 23 for the arms 2 with axes of rotation parallel to the axis of rotation 17th so that their inner sections, from the shaft to the opening 3 up to the ring 4th , do not move relative to each other, their outer sections 22nd but can be pivoted about the respective axis.

The joints 23 preferably also have the transition openings for the discharge of air to the shaft, these can be interrupted in suitable positions under certain circumstances in order to facilitate the detachment of the boards and to prevent the suction of air when empty. If this is not desired, flexible hoses can be arranged in cross bores to ensure the connection.

This pivoting is done by a lever 24 causes the fixed, in particular non-rotatable, with the outer section 22nd is connected, which at its free end by means of a sliding block or a roller 25th in a backdrop 26th to be led. In a manner known per se, the local angular velocity (and thus the local circumferential velocity) of the suction area is determined by the interaction of the link, the lever joint and the outer section 19th determined and can be adapted to the respective requirements. In particular, on the one hand, the removal wheel can be completely stopped 1 can be avoided as a whole, while at the same time the suction area comes to a complete or almost complete standstill in the removal area.

With knowledge of the invention, the person skilled in the art can easily determine the necessary shape of the backdrop. The stabilizing ring 4th does not have to be provided if it is also a simple and stable design of the joints 23 permitted.

the 7th shows an example of the second embodiment of the invention in a representation analogous to that of FIG 6th . A continuous, endless belt 27 indicates the suction areas 19th on. The ribbon 27 runs over a curved guide in the example shown 28 and two pulleys 29 , 30th with the direction of travel in the direction of arrow L. The role is preferred 30th at the end of the tour 28 is arranged, driven so that the belt 27 in the field of leadership 28 (Upper strand) is reliably stressed on train and therefore on the guide 28 is present. A regulation of the tension of the belt 27 can, either by a movable, preloaded bearing of the roller 29 or your own clamping device. As an alternative to the driven roller, a drive via a friction roller or a toothed belt (with a toothed belt) can be provided in the lower strand.

In the area of leadership 28 is achieved by applying a vacuum between the guide and the back of the tape and matching openings in the tape in the area of the suction areas 19th their supply with negative pressure ensured. It can be in the area of the delivery point, on the roll 30th , the supply can be minimized, for example, by the lack of connections to the vacuum source or even the provision of ventilation openings, the negative pressure, thus facilitating the delivery; A subdivision transverse to the direction of movement is also possible, which allows overpressure to be applied in the delivery area. The sliding surface of the guide is, because of the necessary supply of negative pressure, at least in the area covered by the openings in the belt, correspondingly profiled in order to allow the air drawn in to pass through; The supply openings in the guide must also be provided in this area.

There, as mentioned at the beginning, the parts to be punched out 13th are usually provided in several tracks on the endless belt, there are also several, mutually offset removal devices in the punching device 10 to arrange what a person skilled in the art can easily do with knowledge of the invention.

A wide variety of sensors can be provided for monitoring, for example optically recognizing the unwanted detachment of circuit boards with the arm during transport and ensuring a suitable response via an IT system.

The possibility created by the device according to the invention of arranging one or more sensors for checking the quality of the board in the area of its movement path is particularly favorable. These sensors can optically check the print image including its conformity with the outline of the punched-out part, they can check the uniformity of the thickness of the sealing layer and the like. The fact that they are connected to a corresponding evaluation unit and trigger the intended reaction when anomalies are detected then again corresponds to the state of the art and does not need to be explained in more detail here.

It should be noted geometrically that the total radius of the axis of rotation 17th to the face 11 or, if present, to the outer surface 7th one edition 8th corresponds to the distance between the axis of rotation and the output opening of the die, the tolerance being the strength (thickness) of a few of the punched-out parts 13th is equivalent to. With regard to this “output opening of the die, it should also be noted that it does not have to be aligned with an outer surface of the punching device, but can be at a distance from it, for example by means of guides, as shown in FIG 6th is shown. It is preferred that, as in 5 depicted the arm 2 comes into a with the axis of the stack (leading through its center of gravity) parallel, preferably aligned, position. Then the moment the wheel comes to a standstill 1 a safe suction of the foremost board at the right place is guaranteed.

To avoid sucking in dust or foreign bodies, it is possible to connect the longitudinal bores 6th with the central opening or the vacuum line there in such a way that a connection with the vacuum source is only made in the angular position in which it is necessary for sucking in and holding a circuit board. This can also reduce the power of the vacuum source. In further refinements, it is possible to open the opening 3 to divide and the arms 2 to apply excess pressure in the angular positions in which they do not transport a blank in order to reliably blow any dirt out of the various bores, openings and lines.

In the description and the claims, the terms “front”, “rear”, “top”, “bottom” and so on are used in their usual form and with reference to the object in its usual position of use. When it comes to an endless belt, “running direction” refers to the local direction of movement in the intended operation, “transverse to it” essentially means a direction that is rotated by 90 °.

It should also be pointed out that in the description and the claims, information such as “lower area” of a suspension, reactor, filter, structure, or a device or, in general, an object, the lower half and in particular the lower quarter of the total height means "lowest area" the lowest quarter and in particular an even smaller part; while "middle area" means the middle third of the total height (width - length). All of this information has its common meaning, applied to the intended position of the object in question.

In the description and the claims, “essentially” means that a deviation of up to 10% of the specified value, if physically possible, both downwards and upwards, otherwise only in the sensible direction, is included. When specifying degrees (angle and temperature), this means ± 10 °.

In terms such as: “a solvent”, a suction area, etc., the word “a” is not to be seen as a numerical word, but as an indefinite article or as a pronoun, if nothing else emerges from the context.

Unless otherwise stated, the term: “combination” or “combinations” stands for all types of combinations, starting from two of the constituents concerned up to a large number or all of such constituents, the term: “containing” also stands for “consisting the end".

The features and variants specified in the individual configurations and examples can be freely combined with those of the other examples and configurations and used in particular to characterize the invention in the claims without necessarily including the other details of the respective configuration or the respective example

List of reference symbols

1

Removal wheel

2

poor

3

opening

4th

Stabilizing ring

5

Heads

6th

Longitudinal bore

7th

outer surface

8th

Plastic overlay

9

Terminal block

10

Punching device

11

Face

12th

Suction opening

13th

Circuit boards

14th

Stack (passage opening)

15th

magazine

16

Sliding surface

17th

Axis of rotation

18th

Through opening

19th

Suction area

20th

Stack (magazine)

21

die

22nd

outer section

23

joint

24

lever

25th

Leadership role

26th

Backdrop

27

tape

28

guide

29

Pulley

30th

Pulley

31

Punching tool

Claims (7)

Device for removing a punched-out part (13) from a punching device (10), the parts being punched from an endless web of a film and discharged through an output opening in the die (21), the punched-out part (13) being inserted through an introduction opening into a Magazine (15), characterized in that the device has at least one holding part with an outer surface (7), that the outer surface (7) has at least one suction area (19) which is in operative connection with a negative pressure source (vacuum source), that the holding part can be moved along a path from the dispensing opening to the introduction opening, in the area of which the punched-out part (13) is stripped from the holding part, preferably by a stripping surface (16), and is fed to the introduction opening. Device according to Claim 1 , characterized in that the punched-out part (13) is stripped off by applying excess pressure to the suction area (19). Device according to Claim 1 or 2 , characterized in that it has at least one arm (2) which is rotatably mounted with a shaft about its, preferably horizontally arranged, axis of rotation (17), that the arm (2) at its free end, its head (5), which forms the holding part, has an end face (11) that at least one opening in this end face is connected to the vacuum source through the arm (2) and the shaft, and that the end face (11) is the outer surface (7) , or this is formed on a support (8) on the head (5). Device according to Claim 3 , characterized in that the arms (2) are divided into inner sections, which are immovable with respect to the shaft, and outer sections (22) which are connected to the inner sections via joints (23), and that the outer sections (22 ) are non-rotatably connected to levers (24), the free ends of which are guided by means of guide rollers (25) which run in a link (26). Device according to Claim 4 , characterized in that it has several arms (2), that these are connected to one another by means of a stabilizing ring (4), and that the joints (23) are arranged in the connecting area. Device according to Claim 1 or 2 , characterized in that the suction areas (19) of the outer surface are arranged on an endless belt (27) and are connected to the underside of the belt by means of through openings, so that the belt (27) moves from the dispensing opening to the introduction opening and in this area is guided by a preferably curved guide (28), that the vacuum source is in operative connection with the volume between the guide (28) and the belt (27), that in the area of the dispensing opening and the introduction opening deflection rollers (29, 30) for the belt ( 27) are provided. Device according to Claim 6 , characterized in that the deflection roller (30) provided in the area of the feed opening drives the belt.

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