EP0844176A2 - Cutting device and a closure device with a cutting device - Google Patents

Abstract

The cutter has two cutting knives (30, 32). The second knife is pivoted about an axis parallel to the pivot axis of the first. It is pretensioned in a position at right angles to the plane of the material to be cut. The first knife has a guide stop (54), which during a pivot movement of the first knife towards the second knife, engages on a section on the second knife before the cutting blades of the knives engage. Due to this, the second knife is moved slightly out of its pretensioned position, and during the subsequent pivot movement of the first blade into end position, the second knife is positioned mainly parallel to the first one.

Description

The invention relates to a cutting device according to the Preamble of claim 1 and a capping device with a Cutting device.

A cutting device according to the preamble of claim 1 is part of a machine for closing Containers using a metal foil in DE 25 18 679 A1 disclosed. In such a capping machine an open container on a fixed machine base arranged for example in the form of a bowl, and by one The roll with the film for closing the container is the Unrolled film in a suitable length so that the opening of the container is completely covered with film.

Between the container to be closed and the roll with the film is in an area near the container fixed knife of a cutting device attached. Furthermore, between the knife mentioned and the film roll the top of the capping machine is pivotally attached. On the swiveling upper part of the device is a second one Knife arranged so that when swiveling the upper part in The two knives in the direction of the container to be closed slide past each other and separate the film. While the further swiveling movement of the machine head up to an end position in which the machine head largely is aligned parallel to the bottom of the container Foil in the area of the edges of the container to be closed through suitable devices on the machine head in such a way turned over that the container closed with the film becomes.

This known device has the disadvantage that the knife attached to the machine head essentially over the cutting edge of the fixed knife passes on. To a certain extent stand during the swinging down of the Upper part the cutting planes of the two knives in one variable angles to each other, so that the film between the blades are pinched and not cut cleanly. A parallelism of the two cutting planes, which for one jam-free and clean cut is required after cutting the film in the end position of the Machine head.

Another capping device with a cutting device is disclosed in EP 0 091 813 B1. Here is the lower part the device in a direction perpendicular to the flat Extension of the film slidably attached and with a initially provided with an inclined first knife. The first knife is rotatable on one end articulated second knife, the first knife rotatable and Slightly displaceable on the horizontal Machine base is supported. As part of the movement of the Machine lower part in the direction of the to be closed Container moves on the machine base attached knife in the direction of the film upwards and works with the second knife like scissors together that the film material is cut. Hereby a clean scissor-like cut is achieved, it However, especially in the area of the scissor hinge, So the rotatable attachment of the lower knife on the upper knife pinching the film material between the both knives cannot be prevented. Because of the low Opening width of the knife legs in the area of the The fulcrum of the knife is also the retraction of the film from a role that can be carried out as quickly and freely as possible should be handicapped.

Given these disadvantages, the prior art known cutting devices, in particular from Cutting devices on closing devices, is the Invention, the object of a cutting device and to create a sealing device with a cutting device, by means of which the film can be separated cleanly without having to accept a pinch, and at the further good access after a previous cutting process to the beginning of the film material is guaranteed to the To be able to pull the film quickly and without hindrance. The necessary cutting forces are also to be reduced.

This task is performed by a cutting device according to the Claim 1 and a capping device according to claim 11 solved.

Accordingly, the cutting device according to the invention in Agreement with the closest state of the art first knife, one by one to the plane of the cut Material largely parallel axis is pivotable and in an end position largely perpendicular to the plane of the cutting material is aligned, and a second Knife on. According to the invention, the second knife is one Axis that is largely to the pivot axis of the first knife is parallel, rotatable and largely in one position perpendicular to the plane of the material to be cut biased. Also on the first pivoting knife an element is provided which during the pivoting movement of the first knife in the direction of the second knife before Engagement of the cutting edges of the two knives with one Section on the second knife engages that second knife at least slightly from its prestressed Position deflected and during the following Swiveling movement of the first knife to the end position is aligned parallel to the first knife.

With the cutting device according to the invention, that the cutting of the two knives throughout Separation are aligned parallel to each other and in like a pair of scissors gliding past one another enable a clean, pulling cut. The possibility the parallel orientation of the according to the prior art fixed knife to the pivotable knife according to the invention by the rotatable attachment of the second Knife reached. In particular, the second knife is through an element that precedes the first knife from his prestressed position, that of the Foil material vertical position corresponds, as in State of the art is common, deflected, and during the subsequent cutting process by the engagement of the two Cut in a substantially parallel orientation held the swiveling first knife. This will achieved that the cutting of the two knives clean slide past each other and not at an angle pass on to each other, so that by the invention jamming of the cover film can be prevented. Further there is no scissor hinge on which the film clamps can, and in the area of the penetration to the The beginning of the film is hindered since the first according to the invention Knife is pivotally attached and for pulling the film can be swiveled up sufficiently.

Preferred embodiment of the invention Cutting devices are in claims 2 to 10 described.

It is preferred that the first described above Knife an upper knife and the second knife a lower knife is. In this embodiment, the first knife in particularly simple way on the top of a Sealing device be attached, which is for the application of the Cap and the unimpeded insertion of the container is pivoted, while the lower knife, such as described, biased and deflectable on the largely fixed machine base is attached.

It has proven to be a trouble-free cutting process proven advantageous when the first knife is a sloping, preferably concave curved cutting edge having. This training will make a smooth cut when sliding along the described cutting edge of the first Knife on a largely straight cutting edge of the second Knife reached. Due to the geometric shape and storage both knives result in one compared to the state of the Technology significantly reduced cutting force.

For the element with the second knife for it Deflection engages, an approach is preferred that on the first knife in the direction of the pivoting movement is arranged in front of the cutting edge of the knife. By this training can make the first knife structurally simple be executed and at the same time the described deflection of the second knife.

To further avoid jamming of the film material between the two knives it has been certain Use cases proven to be advantageous when the second Knives with a free grinding of preferably about 3 ° to Cutting plane is provided. This free grinding extends from the cutting edge of the second knife in one direction away from the plane of the material to be cut so that as it were below the cutting edge of the second knife a slightly recessed slope is formed in the Area of the cutting edge of the second knife without jamming is recorded.

For the rotatable attachment of the second knife preferred that the axis of rotation of the second knife in the range the cutting plane lies through the two knives in the End position is formed. So the second knife is with in other words around an axis that lies in the knife plane, rotatable and deflectable. This made it possible Deflection movement has for the constructive execution and the parallel alignment of the two knives to each other during the cutting process as particularly advantageous proven. There are many options for the first knife pivotable attachment conceivable, but it is preferred and has proven to be advantageous, the pivot axis of the first knife at a clear distance from the cutting plane to be arranged so that the first knife, if necessary together can be swung open wide with the machine head, and creates good accessibility

For pretensioning the second knife into an end position largely perpendicular to the plane of the material to be cut a spring element is preferred, by means of which the second Knife is biased against a stop that is preferably adjustable. With this Arrangement can be a structurally simple and easily customizable Attachment of the second knife can be achieved.

In special applications and when using special Materials can be used for the invention Cutting device advantages can be achieved when the second Knife when viewed perpendicular to the plane of the cutting material at a slight angle the first knife is aligned. This allows during of the cutting process any clamps in an advantageous manner Way can be prevented.

For the angle of attack of the two knives to each other 0.1 ° to 0.5 ° preferred, and an angle in the range of 0.2 ° has proven to be particularly advantageous.

The closing device according to the invention for closing a open object, preferably a container with a sheet material, for example a film, has a Cutting device in one of the described Embodiments on. This allows for a Sealing device that separates a section of a Foil and the subsequent closing of a container with serves the separated film, a cleaner, scissor-like and a jam-free cut of the film material is guaranteed will.

For the closing device according to the invention it is preferred that the first knife removable on the swiveling upper part of the Sealing device is attached, and that the upper part further has a handle. The removable attachment of the First knife is the exchange option for this Given component and by attaching to the pivotable The upper part, which is provided with a handle, is one simple operation of the closing device according to the invention possible.

Fig. 1

eine Seitenansicht eines erfindungsgemäßen Verschließgeräts mit einem Teilschnitt;

Fig. 2

eine Detailansicht der beiden Messer der erfindungsgemäßen Schneidvorrichtung in dem in Fig. 1 gezeigten Verschließgerät;

Fig. 3

eine Schnittansicht entlang der Linie III-III gemäß Fig. 1; und

Fig. 4

eine teilweise Draufsicht des in Fig. 1 gezeigten Verschließgeräts.

The invention is described in more detail below using an exemplary embodiment shown in the drawings. Show it:

Fig. 1

a side view of a capping device according to the invention with a partial section;

Fig. 2

a detailed view of the two knives of the cutting device according to the invention in the closing device shown in Fig. 1;

Fig. 3

a sectional view taken along the line III-III of FIG. 1; and

Fig. 4

a partial plan view of the capping device shown in Fig. 1.

As can be seen in Fig. 1, the inventive Capping device 10 on a lower part 12, which has feet 14, only one of which is shown on a pad 16 is supported. In the left area of FIG Sealing device 10 is a roll 18 with film material recognize that in a suitable manner on the lower part 12 of the Sealing device 10 is stored.

In the right area in the illustration of FIG Sealing device 10 is an upper part 20 in the form of a lid via a lever 22, which is in an open position in FIG is shown with a chain line in the area of The roller 18 is pivotally supported on the lower part 12 appropriate. In Fig. 1 is also with a chain line the open position of a handle 24 shown by an operator can be gripped so that he can be in the solid end position is drawn, in which by means of the upper part 20 a container 52 which in the Lower part 12 is arranged with a preceding one severed section of a film from the roll 18 is closed.

To separate the film section, the upper part 20 attached an upper knife 30 via a screw 26. The Upper knife 30 is removable and from the machine upper part 20 can be used for regrinding or replacement if necessary can be removed by a new knife 30. To cut of the film material unrolled from the roll 18 acts Upper knife 30 during its swiveling movement, which it along with the upper part 20 with a lower knife 32 together. The lower knife 32 is via a screw 34 detachably attached to a knife carrier 36 which by a Axis 38 is pivotally attached to the lower part 12. over a largely horizontal leg 40 of the Knife carrier 36 is the arrangement of lower knife 32 and Knife carrier 36 by means of a spring element 42 against one Stop 44 in the form of an adjustable screw in a Prestressed position in which the lower knife 32 and especially its cutting edge largely perpendicular to that to be cut film material is arranged according to the 1 runs largely horizontally.

In Fig. 2 is the arrangement of the components of the Shown cutting device according to the invention. Complementary 1 can be seen that the Lower knife 32 below its cutting edge 46 with a Free grinding 48 is provided, through which the cutting knife 32nd with a somewhat inclined area is provided, which has a free space for that on the lower knife 32 passing upper knife 30 forms to a jam to prevent between the two knives. The same purpose serves a free grinding 50 extending upwards the knife carrier 36.

In order to close a container, the upper part 20 together with the attached upper knife 30 Operation of the handle 24 is initially pivoted upwards. By rotating the pivotable components around an axis in the The left-hand area of FIG. 1 moves the arrangement mentioned upwards and at least slightly sideways, to the left as shown in the figures. While this movement is the lower knife 32 by it sliding upper knife 30 pressed to the left, so that the arrangement consisting of lower knife 32 and knife carrier 36 against the bias applied by the spring 42 rotates slightly about the axis 38 and from its in Fig. 2nd shown so-called end position is deflected. Once the lowest section of the upper knife 30 the area above of the upper edge of the lower knife 32, the ends Intervention between the two knives and the application of the leftward compressive force on the lower knife 32, so that the knife carrier 36 together with the lower knife 32nd due to the spring preload in its shown in Fig. 2 End position moved back. In this open position a container 52, which is indicated in Fig. 2, in the Bottom part 12 can be arranged.

Below is a section of sheet material 58 from the Roll 18 pulled and over the container to be closed 52 placed. As part of the pivoting movement of the upper part 20 to close the container, see above process described so to speak in reverse order instead of. As soon as the lowest section 54 of the upper knife 30 (see FIG. 3) reaches the upper edge of the lower knife 32, these two elements come into engagement with each other, and the lowest section 54 of the upper knife 30 expresses this Lower knife 32 a little to the left according to the drawing, see above that this together with the knife carrier 36 at least slightly deflected by rotation about axis 38 becomes. During the subsequent swiveling process of the Upper part 20 up to its end position shown in FIG. 2 is the lower knife 32 by means of the spring 42nd applied pre-tension always against the upper knife 30 depressed, a section of which is continuously engaged with the lower knife, and the lower knife 32 will always in an arrangement parallel to the upper knife 30 held. This creates a clean, scissors-like cut allows without rolling or pinching the film material 58 by the pivoting Movement of the upper knife 30 over a fixed one Lower knife is made. Rather, as described, the Lower knife 32 in a suitable manner by engaging with a section 54 deflected on the upper knife 30 and in held parallel to the upper knife 30, so that a jam-free cutting of the film material 58 despite Swiveling of the upper knife is achieved.

From the representation shown in Fig. 3, which is characterized by a Section along the line III-III of FIG. 1 results again clearly how the different sections of the Knife for the deflection of the lower knife 32 and the Upper knife 30 parallel alignment is achieved. For 3 is an open position of the shown two knives. It can be seen in particular like the lower knife 32 rotatable about the knife carrier 36 the axis 38 in the form of a bolt on an element of the Lower part 12 is attached. The lower knife 32 has one largely straight, according to the usual orientation of such a closing device arranged horizontally Cutting edge 46 on.

For the deflection of the lower knife 32 is in a lower Area of the upper knife 30 a neck 54 or a nose provided that during the pivoting movement of the upper knife 30th down ahead of the upper knife 30 to a certain extent. Of the Approach 54 consequently comes to one during the pivoting movement Time engaged with the lower knife 32 at which the inclined and curved cutting edge 56 of the Upper knife 30 still from the cutting edge 46 of the lower knife 32 is spaced. At the initial deflection of the Then slide the lower knife 32 through the shoulder 54 successively the individual points along the cutting edge 56 of the upper knife 30 at the corresponding points on the Cutting edge 46 of the lower knife 32 over and ensure a separation of the film material. Furthermore, that Lower knife 32 continues through that of the various Places on the cutting edge 56 applied force in its held deflected position and thus remains during the entire separation process in a parallel orientation the knife 30 which is pivoted downwards. With a dash-dotted line is in the region of the lower part 12 End position of the upper knife 30 shown, the 2 corresponds, and in which Foil material 58 is already completely severed.

4 is another advantageous feature of shown embodiment of the invention Cutting device clearly. From the top view is namely the angle α can be seen at which the lower knife 32 to the Longitudinal axis L is arranged, which is essentially the Direction of supply of the roll material corresponds. It is noted that the upper knife 30 is so on the upper part 20th the sealing device 10 is attached that it is under a 90 ° to L direction. In contrast to is the lower knife with respect to the upper knife under one Angle of 0.2 ° made so that the angle α according to FIG. 4th Is 90.2 °. Because of this minor employment between the two knives with a slight opening towards the Area of the upper knife, which is shown in FIG. 3 on the left and at a later time with the lower knife engages, a clamp between the both knives prevented and in cooperation with the deflection according to the invention of the lower knife and the Upper knife 30 parallel arrangement a clean and Scissors-like separation of the film material achieved.

Claims (12)

Cutting device, with: a first knife (30) which is pivotable about an axis largely parallel to the plane of the material to be cut and, in an end position, is oriented substantially perpendicular to the plane of the material to be cut, and, a second knife (32)
characterized in that the second knife (32) is rotatable about an axis (38) which is largely parallel to the pivot axis of the first knife (30) and is biased into a position substantially perpendicular to the plane of the material to be cut, and the first knife (30) has an element (54) which, when the first knife (30) pivots in the direction of the second knife (32) before the cutting edges (46, 56) of the knives (32, 30) engage a section on the second knife (32) engages in such a way that the second knife (32) is deflected at least slightly from its pretensioned position and largely parallel to the first knife (30) during the subsequent pivoting movement of the first knife (30) up to the end position is aligned. Cutting device according to claim 1,
characterized in that
the first knife (30) is an upper knife and the second knife (32) is a lower knife. Cutting device according to claim 1 or 2,
characterized in that
the first knife (30) has a sloping, preferably concave curved cutting edge (56). Cutting device according to at least one of the preceding claims,
characterized in that
the first knife (30) has a shoulder (54) which is arranged in the direction of the pivoting movement in front of the cutting edge (56) of the knife (30) and engages with a section on the second knife (32). Cutting device according to at least one of the preceding claims,
characterized in that
the second knife (32) has a free cut (48) of preferably approximately 3 ° to the cutting plane, which extends from the cutting edge (46) of the second knife (32) away from the plane of the material to be cut. Cutting device according to at least one of the preceding claims,
characterized in that
the axis of rotation (38) of the second knife (32) lies in the region of the cutting plane which is formed by the two knives (30, 32) in the end position. Cutting device according to at least one of the preceding claims,
characterized in that
the pivot axis of the first knife (30) is arranged at a distance from the cutting plane which is formed by the two knives (30, 32) in the end position. Cutting device according to at least one of the preceding claims,
characterized in that
the second knife (32) is biased by means of a spring element (42) against a stop (44) which is preferably designed to be adjustable. Cutting device according to at least one of the preceding claims,
characterized in that
the second knife (32), when viewed perpendicular to the plane of the material to be cut, is oriented at an angle to the first knife (30). Cutting device according to claim 9,
characterized in that
the angle is in the range between 0.1 ° and 0.5 ° and is preferably 0.2 °. Closing device (10) for closing an open one Object, preferably a container (52) with a flat material, preferably a film, with a cutting device according to at least one of the preceding claims. Closing device according to claim 11,
characterized in that
the first knife (30) is removably attached to a pivotable upper part (20) of the closing device (10), which preferably has a handle (24).

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