DE9300781U1 - Device for processing blanks of a sheet material - Google Patents

Description

Max Kettner Verpackungsmaschinen GmbH & Co KQ,,820q,RosenJipim, fußere.tyüqcjypr Straße 104

Device for processing cuts of a sheet material

The invention relates to a device according to the preamble of claim 1.

In known devices, suitable means are provided for separating the blanks from a stack of blanks, such as suction grippers or friction rollers. The blank separated from the stack is then fed to another processing station. In this station, the blank is fixed by holding elements and folded by levers or the like.

The disadvantage of the known devices is the required expenditure on mechanical parts and the space required for the additional processing station.

The object of the invention is to create a device for processing blanks which requires little mechanical parts and little space.

According to the invention, this is achieved by the characterizing features of claim 1.

Further developments and refinements of the invention are the subject of the subclaims.

A possible embodiment of the invention is explained in more detail below using three figures and the list of reference symbols.

Show it:
Figure 1 the device in the initial position when lifting a blank

from the stack

Figure 2 the device with a partially lifted blank

Figure 3 the device in the final position with a folded blank

Figure 1 shows a partially sectioned view of a stack of blanks and a mechanism 2 by means of which the blanks 1 are processed. The mechanism 2 comprises several suction grippers 3. In the present case, only two suction grippers 3a, 3b are shown for reasons of clarity. For larger formats of the

Max Kettner Verpackungsmaschinen GmbH&GO KG.8200 Resenheim Äußere Myocliner Straße 104 Page

For each cut 1, more suction grippers 3 are required to process the cut 1.

The mechanism 2 includes, among other elements, two levers 2a, 2b. The levers 2a, 2b are movably connected to one another via an axis 4. The suction gripper 3a is connected to the lever 2a, the suction gripper 3b to the lever 2b. The entire mechanism 2 is designed to pivot about two bearings 5a, 5b.

To move the mechanism 2, an actuator 7 engages the force linkage point 6. The actuator 7 can be, for example, a pneumatic lifting cylinder or an electric spindle drive.

Figure 2 shows the process of lifting a blank 1 from the stack. In a manner known per se, the top blank 1 is fixed by the suction grippers 3a and 3b using negative pressure and is removed from the stack by moving the mechanism 2.

The levers 2a, 2b move around the bearings 5a, 5b and 5c. The distance of the suction gripper 3a from the bearings 5a, 5b is significantly smaller than the distance of the suction gripper 3b from the bearings 5a, 5b. The suction gripper 3a moves around the bearing 5a together with the lever 2a. The suction gripper 3b moves together with the lever 2b. The lever 3b is moved around the bearings 4 and 5c, which results in a relative movement of the levers 2a and 2b. Due to these mechanical relationships, the suction gripper 3b covers a greater distance during the lifting process and lifts the blank 1 from the stack in a similar way to a peeling movement.

This has an additional advantage because an edge of the blank 1 is lifted off the stack first and air can easily flow in between the just lifted blank 1 and the stack during the lifting process. In this way, the well-known difficulties in separating, the so-called vacuum effect, are counteracted.

The already described relative movement of the suction grippers 3a, 3b to one another continues with the further movement of the levers 2a and 2b. The levers 2a, 2b rotate about the axis 4. The parts of the suction grippers 3a, 3b that touch the blank 1 are no longer in one plane but in two different, intersecting planes. According to the invention, it is provided that the intersection line of the planes is aligned with the extension of the axis 4.

Max Kettner Verpackungsmaschinen GmbH&GO KG.8200 Rosenheigi ÄußetaMüticJiner Straße 104 Page

In the final position according to Figure 3, the blank 1 is bent. The position of the bend is, as mentioned above, in the extension of the axis 4. In order to facilitate the bending, the flat blank 1 can be pre-treated along the line along which the bend is to run later, e.g. by embossing, which makes bending easier.

It is also possible to dispense with the pretreatment and instead to have a bar or an edge run over the entire width of the blank 1 in extension of the axis 4 and to fold the blank around the bar or the edge.

In the selected sectional view, only two suction grippers 3a, 3b are visible. For larger format blanks, more than two suction grippers can of course be used according to the invention. However, the suction grippers must be arranged on the levers in such a way that they form two groups and the parts of the suction grippers of each group that touch the blank are each in the same plane.

Furthermore, the invention is not limited to just two different groups of holding elements. Any number of groups of holding elements can grip and bend the blank.

With three groups of holding elements, the cut piece can be bent into a U-shape, for example. The three groups of holding elements are located in three different planes. The first plane intersects with the second plane, the second plane intersects with the third plane, the third plane runs parallel to the first plane.

Max Kettner Verpackungsmaschinen GmbH&Cp KG 8200 Rqsenheirj Äußere Münchner Straße 104

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List of reference symbols

4 *

1 2 B Cutting 2 3b mechanics 2a, lever 3a, 5b, 5c Suction cup 4 axis 5a, camp 6 Force pivot point 7 Actuator

Claims (7)

Max Kettner Verpackungsmaschinen GmbH&CO KG 8200.Rosenfeeim Äußere Münchner Straße 104 Page A Protection claims Device for processing cuts of a sheet material 1. Device for processing blanks (1) of a sheet-like material, the device having means (2) for separating the blanks (1) from a stack of blanks (1) and means (2) for folding the blanks, characterized in that the means (2) for separating comprise at least two groups of holding elements (3) that can be moved independently of one another, the blank (1) can be lifted from a stack by means of the holding elements (3), an actuator (7) is provided by which the holding elements (3) can be moved from a first position to a second position, in the first position the parts of the holding elements (3) of each group that touch the blank (1) lie in one plane, in the second position the parts of the holding elements (3) of each group that touch the blank (1) lie in different planes. 2. Device according to claim 1, characterized in that the blank (1) can be folded from the first position into the second position by the movement of the holding elements (3). 3.Device according to one of the preceding claims, characterized in that in the second position the parts of the holding elements (3) touching the blank (1) lie in different, intersecting planes. 4.Device according to one of the preceding claims, characterized in that in the second position the parts of the holding elements (3) touching the blank (1) lie in more than two different planes and these planes intersect or run parallel to one another. 5.Device according to one of the preceding claims, characterized in that the holding elements (3) comprise suction grippers (3a, 3b). Max Kettner Packaging Machines Gmby&CO KG 8200J3osenbeim Äußere Münchner Straße 104 Page Z 6.Device according to one of the preceding claims, characterized in that the means (2) for separating the blanks (1) comprise holding elements (3) that are movable via a lever mechanism (2a, 2b). 7.Device according to one of the preceding claims, characterized in that the means (2) for separating the blanks (1) comprise holding elements (3) that can be moved independently of one another.