Patent Application
20160332834
The present Patent Application claims priority to German Patent Application No. DE202015102476.2, filed May 13, 2015 by the inventor named in the present Application. The entire disclosure of the above-referenced patent application is incorporated herein by reference.
The present disclosure concerns a ramp device for accurate guidance of stamped parts or raw material sheets.
During the processing of paper-based products for packaging, such as those made of paper, cardboard, or carton, raw material sheets are typically guided across tools such as presses, punches or break-out tools. In this process, it is essential for the raw material sheets to be fed reliably and constantly the same and not to slip or in any way become skewed or buckled. Furthermore, it is of equal importance that products punched out, broken out or blank-separated from a raw material sheet are taken away reliably and quickly. An irregular feeding or takeaway due to possible skewing or jamming of the raw material sheets or the punched, broken-out, or blank-separated products leads to far-reaching problems in the processing. For example, if the raw material sheets are skewed at the openings of the stripping boards or blank separating tools, they will be wrongly punched, broken out, or blank separated; products not taken away result in blockage in the further processing sequence or faulty stack laying in the case of a blank separation. A jamming or skewing of the raw material sheets especially during the feeding through relatively large-area openings of the stripping boards or lower blank separation dies is therefore an enormous problem. Although the edges of the openings of the stripping boards and lower blank separation dies are rounded to avoid such problems, this measure is not enough to ensure a permanent and faultless production sequence, particularly for raw material sheets which are especially light or especially heavy. If such a problem should occur, costly time, costly material, and labor expense will be wasted, so that avoidable costs are incurred. Thus far, there has been no solution to the existing technical problem.
A problem which the present disclosure proposed to solve is to create a device which prevents the aforementioned technical problems, especially the skewing or jamming of the various raw material sheets at the openings of the stripping boards or lower blank separation dies and supports the takeaway and further transport of the products.
The ramp device provides a more precise feeding or placing of raw material sheets in the tool or on the stripping board and on the other hand the takeaway of the products is supported.
According to embodiments of the invention, the ramp device is designed to form a ramp at one edge of an opening of a stripping board and/or a lower blank separation die of a tool so that a raw material sheet being fed at this place is not skewed or buckled, which can lead to a defective production or outage of the tool. In order to ensure this, several ramp devices generally are also placed at one edge, depending on the side of the opening of the stripping board or the lower blank separation die.
In some embodiments, the ramp device comprises a holding block. Typically, the holding block can be placed reversibly by hand into a ramp receptacle and a holding slot of a stripping board or a lower blank separation die. The holding block is typically square-shaped and has at least one rounding. Furthermore, holding slats can be arranged on the holding block to prevent a slippage or unwanted loosening of the holding block in and out from the ramp receptacle.
A spring element arranged at the holding block can stick out 0.3 to 1.0 mm above the edge of the stripping board or the lower blank separation die. The spring element can, at first, have a curved course above the top surface of the holding block and then arch down toward the bottom surface of the holding block after reaching a vertex point, in an essentially quarter-circle shape. This projecting piece can help facilitate the ramp function, and help prevent a faulty feeding of the raw material sheets.
In certain embodiments, the spring element may have a weakening at the vertex point, which determines the spring constant of the spring element. In different embodiments of the ramp device, this weakening can be varied, according to the type and material properties of the raw material sheet. With color coding, different spring constants or different ramp devices can be distinguished by the user. This can enable a user to quickly and easily select the proper ramp device for the corresponding raw material sheet.
In some embodiments, the holding block has at least one rounding. For example, several edges of the square-shaped holding block can have roundings or be rounded off. Furthermore, the holding block can have holding slats. This design further can make it easier for the user to move the holding block into a ramp receptacle and the holding slot of the stripping board or the lower blank separation die of a tool on the one hand, and help ensure a reliable positioning of the holding block in the ramp receptacle and the holding slot on the other hand.
When using the ramp device according to embodiments of the invention, the ramp device generally is inserted by hand into a ramp receptacle and a holding slot of a stripping board or a lower blank separation die. The spring element can stick out by its arch at the vertex point beyond the edge of the stripping board or the lower blank separation die so that a ramp is formed. The ramp so formed prevents a skewing, jamming or buckling of the raw material sheet being fed at the edge of the stripping board or the lower blank separation. Depending on the size of the individual opening, several ramp devices can be used.
If a raw material sheet is then fed and positioned, the resulting product will be pressed down by an upper break-out tool or upper blank separation die, while the spring element of the ramp device is loaded and the abutting bulge is pressed in the direction of the holding block. When a certain pressing depth of the product is reached by the upper break-out tool or upper blank separation die, the spring element rebounds to the position of rest. In this process, a downward directed push is transmitted to the product, via the abutting bulge at the free end of the spring element. This push transmitted to the product by the rebounding of the spring element promotes a smooth takeaway and further transport and helps prevent blockages or standstill due to products getting stuck.
The disclosure will be explained below with the help of schematic drawings. The drawings show:
The holding block 2 has a top surface 8, four side surfaces 10.1 to 10.4 and a bottom surface 9. The bottom surface 9 is arranged on the other side of the top surface 8 of the holding block 2, while the side walls 10.1 to 10.4 extend from the top surface 8 to the bottom surface 9.
Since the holding block 2 of the present disclosure is shown as essentially a cuboid, every two opposite side surfaces 10.1 to 10.4 generally have the same area. In turn, two of the side surfaces 10.2 and 10.4 have a larger area than the other two side surfaces 10.1 and 10.3. In the sample embodiment shown here, holding slats 7 arranged parallel to each other are formed on the other two side surfaces 10.1 and 10.3, which are shown for example in the partly see-through
The holding block 2 has at least one rounded edge 3.
Furthermore, in
The course 4a as shown further can extend beyond the dimension of the side walls 10.1 to 10.4 from the bottom surface 9 to the top surface 8. In particular, it can extend beyond the top surface 8.
This spring element 4 generally has a weakness 6 at the vertex point 13, which can determine the spring constant of the spring element 4. Furthermore, an abutting bulge 5 is arranged in this sample embodiment at the free end of the spring element. The abutting bulge is meant to prevent the spring element 4 from possibly being pressed too much in the direction of the side wall 10.4 or taking too much time to return from this position to the starting position, as shown in
The spring element 4 stands out from the top surface 8 where it is joined to the holding block by a preferred distance of about 0.3 to 1.0 mm above the holding block 2, depending on the type of configuration.
The spring element 4 can be free running and protrudes into an opening of the tool 11, and also can protrude at least partly into the holding slot 15 of the tool 11.
The holding slats 7 are arranged on the opposite side walls 10.2 and 10.4. The bottom surface 9 of the holding block 2 is furthermore typically more narrow as compared to the top surface 8. This generally results in a slightly wedge-shaped configuration, which can make it easier to insert the holding block 2 into the ramp receptacle 13 and the holding slot 15.
The spring element 4 in this sample embodiment has no abutting bulge at its free end and likewise no weakening at the vertex point 13.
In this embodiment, the spring element 4 at first runs with a preferred height a of around 1.0 mm in a curve above the top surface 8 of the holding block 2 and then after reaching a vertex point 13 it arches downward in an essentially quarter-circle shape to the bottom surface (9) of the holding block (2). The spring element 4 protrudes into the holding slot 15 and an opening of a tool 11 such that it projects beyond the cutting line M, for example, by around 4.0 mm, though greater or lesser projections/distances also can be provided.
In this embodiment a configuration of the spring element 4 can be provided wherein it broadens from a width b of about 3.0 mm at the start on the holding block 2 to a width c of about 0.5 mm at the free end. With such a configuration, in addition to the ramp function, the takeaway and further transport of certain products can be substantially ensured in reliable manner. The broken line M marks the position at which the raw material sheet is cut, punched, or broken off.
The mode of operation is as follows:
The ramp device 1 is inserted with the holding block 2 in a ramp receptacle 12 and a holding slot 15 of the tool 11, so that the spring element 4 in the starting position stands above the edge of the tool so that a ramp is formed.
The raw material sheets can be fed by a feeding device, not otherwise depicted, to arrive at the defined punching or breaking position and slide partly or entirely across the ramp device 1. In the sample embodiment shown here, the raw material sheet is brought into the defined punching or breaking position. Buckling or skewing can be generally prevented by the ramp device. After the product 20 has been punched out, the rest of the raw material sheet is transported away across the ramp device, especially at first across the vertex point 13 of the spring element 4 and then across the top surface 8 of the holding block 2.
After this, the product 20 is broken off and/or blank-separated. Next, the product 20 is pressed in the arrow direction x, so that the spring element 4 is loaded and the free end is pressed in the direction of the side wall 10.4.
The pressed-down product 20 slides along the arc surface of the spring element 4 arranged at the side wall 10.4 until the product 20 has passed the abutting bulge 5 of the spring element 4. Thereupon, the product 20 is ejected downward in the direction of a floor, not otherwise described, by a rebounding of the spring element 4 into the starting position of
The foregoing description generally illustrates and describes various embodiments of the present invention. It will, however, be understood by those skilled in the art that various changes and modifications can be made to the above-discussed construction of the present invention without departing from the spirit and scope of the invention as disclosed herein, and that it is intended that all matter contained in the above description or shown in the accompanying drawings shall be interpreted as being illustrative, and not to be taken in a limiting sense. Furthermore, the scope of the present disclosure shall be construed to cover various modifications, combinations, additions, alterations, etc., above and to the above-described embodiments, which shall be considered to be within the scope of the present invention. Accordingly, various features and characteristics of the present invention as discussed herein may be selectively interchanged and applied to other illustrated and non-illustrated embodiments of the invention, and numerous variations, modifications, and additions further can be made thereto without departing from the spirit and scope of the present invention as set forth in the appended claims.
| Number | Date | Country | Kind |
|---|---|---|---|
| 20 2015 102 476.2 | May 2015 | DE | national |
