JPS5848320B2 - Method and device for punching containers individually or in groups - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is a method of individually forming containers formed from a hot eave plastic sheet by deep drawing, sealed with a cover sheet, and arranged in a row extending at right angles to the longitudinal direction of the sheet. A method and apparatus for punching out wedges or clusters at the edge of the container, comprising first punching a wedge-shaped piece from the sheet to round the corners of the container, and then punching out the remaining cutting lines on the edge of the container. and/or with a planned break line between the containers.

A method and a device of this type are known from German Patent Application No. 1511618 F3A.

In this known device, the punching out of the wedge-shaped piece and the punching out of the remaining container edges and/or optionally the provision of a predetermined break line between the containers are carried out simultaneously or are otherwise offset by the distance of the feed. They are done one after the other.

If these working steps are carried out simultaneously, as mentioned in DE 15 11 618, the cutting edge for the wedge-shaped piece and the cutting to punch out the remaining container rim The blades must be arranged on the same plane, and it cannot be constructed as a punching tool with a punch and a die.

On the contrary, the cutting tool has to work on a flat, elastic plywood board, which is extremely detrimental to the quality of the cut surface.

If, according to another proposal in German Patent Application No. 1,511,618, the wedge-shaped piece cutting blades are arranged offset by the width of the feed with respect to the cutting blades on the remaining container edge, then The difficulty arises in that the cutting edge of the edge of the wedge has to be arranged at the same spacing as the feed spacing relative to the tip of the wedge-shaped piece cutting edge.

Otherwise, the cutting edge of the remaining edge will not extend exactly through the cusp of the wedge-shaped gap, so that an undesirable barb will form on the edge of the package at that point.

According to another proposal for punching out containers individually or in groups, which is described in DE 2000 618 A1, the containers are punched out in a sequential feed cutting method. It has become.

In this case, punches and dies are also used, but these punches and dies are arranged so that they punch out only one edge in the circumferential direction of the container at the initial stage. However, the remaining portion of the rim of the container is punched out after the container has been advanced by the feed interval.

The above-mentioned drawbacks also occur with this punching device.

That is, manufacturing tolerances and the effects of anisotropic sheet materials, which are unavoidable in thermoforming machines, mean that in this case too, the cut line of the remaining edge of the container does not always extend through the tip of the wedge. In this case as well, an inconvenient thorn occurs.

Furthermore, it can be mentioned that it is disadvantageous in this case that the very expensive punching tool has to extend over a double feed interval and is therefore unnecessarily large and complex.

It is an object of the present invention to eliminate the disadvantages of known punching methods and devices, and also to ensure that the cut line or intended break line for punching out the remaining edge of the container is precisely aligned with the tip of the wedge-shaped piece even when manufacturing tolerances are relatively large. a punching method which allows for overlap and thus eliminates the splinters that would otherwise occur when punching out the wedge-shaped piece and cutting the remaining edge of the container are carried out one after the other by exactly the distance of the feed; The object of the present invention is to provide a device of simple structure that works according to the method.

This object is achieved by a method and a device having the characteristics described in the claims of the invention.

The punching out of the wedge-shaped piece and the cutting and/or predetermined break line for punching out the remaining container rim are done so sequentially, but with the same movement of the punching tool, and thus in one working process. When the containers are also individualized and wedge-shaped pieces are punched out, there is no generation of any waste other than the wedge-shaped pieces, possibly at the edge of the sheet, thereby ensuring that the appearance of splinters on the edges of the containers is eliminated; Furthermore,
It is possible to obtain a relatively simply constructed punching tool whose dimensions only slightly exceed the dimensions of the container to be punched.

By combining the punches and punches, the cross-sectional contours of these punches match the cross-sectional contours of the edges of the container, so that within one frame the cutting line of the remaining edge of the container can easily be aligned with the tip of the wedge-shaped gap. It can be obtained that it matches.

This is because the cutting lines are forced to coincide with the tangents of the individual punches, while the wedge-shaped gap die emerges from the cavity formed between the punches.

Another advantage of the device according to the invention, which has a punch for the wedge-shaped pieces in the lower tool and a die for the wedge-shaped pieces in the upper tool, is that the wedge-shaped pieces punched from the sheet can be punched in the punch in the upper tool. The wedge-shaped piece can be guided upwards without interfering with the removal of the punched container.

Next, embodiments of the present invention will be described with reference to the drawings.

As can be seen in FIG. 1, the punching tool consists of a stationary upper tool and a lower tool that is moved relative to the upper tool by suitable equipment.

The alignment of the upper tool and the lower tool is carried out in the hole 23 of the block 1 of the lower tool and in the frame 14 of the upper tool.
This is done via a guide rod (not shown) that enters the hole 24 of the.

The block 1 is provided with cutouts 3, 5 for containers formed by deep drawing in a thermoplastic sheet and sealed with a cover sheet;
It is limited by the webs γ, 9, and IL13 formed in the.

This notch 3 is formed by step-shaped steps γa, 9a, lla (1 in the drawing) where the webs 1, 9, 11.
1b), 13a and cutting edge 7b,
9b, 1lb, 13b, the cutting edges of which pass exactly into the tips of the punches 6, 8, 10, 12 for the wedge-shaped pieces, so that This is different from the notches 5 which are arranged offset.

This notch 5 is limited by webs 11 and 13 toward the inside of the notch 3, while step-shaped steps γC and 9c are provided in the webs 7 and 9 toward the outside. and the cutting edge γd directed outward,
It has 9d.

The punches 6, 8, 10.12 are manufactured as separate components and the point of the punch cuts precisely into the cutout of the web 1, 9, 11.13 at the cutting edge γb. , γd, 9b, 9d, Nb, 'f3b.

The punches 6, 8, 10, 12 for wedge-shaped pieces cut the webs 7, 9, 11, 13 at predetermined intervals of a few millimeters.
protrudes from the upper edge of

As can be seen in the drawing, the punch 6 is adapted to punch out substantially triangular wedge-shaped pieces.

These punches 6 are curved outwards in order to strengthen the tips located in the direction of feed.

The punch 8, which is arranged in the center of the block 1 at the intersection of the web IL13, has a substantially diamond-shaped cross section.

The punches 10, 12, which are arranged on the inlet and outlet sides of the punching tool in the direction of feed, again punch out essentially triangular wedge-shaped pieces.

In this case, these punched out, approximately triangular wedge-shaped pieces complement each other to form an approximately perfect diamond-shaped gap between the containers.

Since it is not possible in this region to strengthen the tip of the wedge-shaped gap in the manner described for the punch 6, the punch 10 is provided with faces 10b which extend away from each other in the form of a chevron. Furthermore, in its central region it is provided with a notch, the leading edge 10c of which extends parallel to the cutting edge 9 b t 9 e of the web 9 .

On the other hand, the punching punch 12 has a surface 12b formed by a step and having a notch.
The leading edge 12C extends in alignment with the cutting edges 9f, 9d of the web 9, which are arranged at the front end of the lower tool, viewed in the direction of feed.

Rear cutting edge 9b and front cutting edge 9 of the lower tool
d is only slightly larger than the feed interval, whereas the edge 10c of the punch 10, 12
and 12c is exactly the same as the feed interval.

The purpose of this arrangement will be explained in relation to the working type of the punching device.

The upper tool consists of a frame 14 in which, as already mentioned, a guide hole 24 for a guide rod (not shown) is provided.

A punch 2 and a punch 4 for containers are arranged on the frame 14 .

These punches 2, 4 have a cross-sectional contour that corresponds to the cross-sectional contour of the rim of the container.

In this case, since it is desired that the edge of the container has rounded corners, voids Pfr1B, 18, 20, 22 are formed between the frame 14 and the punches 2, 4. The hollow space is formed by the punch 6 of the lower tool for the wedge-shaped piece.
It forms dice for numbers 8, 10, and 12.

Cutting edges 16a, 1 of dies 16, 18, 20, 22
8a, 20a, 22a are undercut, as illustrated by dashed lines in FIG. 2, so that a wedge-shaped piece punched from the sheet can be guided upwards without getting caught.

The punch 4 is arranged recessed relative to the punch 2, so that in each case only the punch 2 cooperates with the corresponding recess 3 in the lower tool to cut.

In this case, the cut is made at the cutting edge 2 in front of the punch 2.
b1 Lateral cutting edge 2c and rear cutting edge 2a
These cutting edges 2b, 2c, 2
a cooperates with a corresponding front cutting edge 11b1, a lateral cutting edge γb, 13b and a rear cutting edge 9b, which are arranged on the web 9, γ, 11.13 in the block 1.

In the area of the punch 2, the frame 14 has recessed edge areas 14d, 14e which each extend from the center of the die 16 to the center of the die 20 or which extend from another edge area. Dice 1
6 to the center of the die 22.

This recessed edge region 14d lies in the same plane as the punch 4 and has a cutting action only within the area of the dies 16, 20, 22.

The edge region 14f of the frame 14 is located at the same level as the punch 2 and is provided with a front cutting edge 14b and a lateral cutting edge 14C, viewed in the feed direction, these cutting edges 14b, 14c The corresponding rear cutting edge 14a cooperates with the rear cutting edge 9e of the web 9 and with the lateral cutting edge 1d, whereas the corresponding rear cutting edge 14a cooperates with the rear cutting edge 9e of the web 9 and with the lateral cutting edge 1d. Cutting edges 14c and 1d cooperate accordingly.

The transition between the edge area 14f located at the level of the punch 2 and the edge area 14d located at the level of the punch 4 is
This takes place via an edge area 14g starting from the center of the die 16 and configured in the form of a ramp, and an edge area 14h starting from the center of the die 20 or 22.

The cross-sections of the dies 16, 18, 20, 22 correspond exactly to the cross-sections of the wedge-shaped piece punches 6, 8, 10, 12.

The die 22 has a recessed mountain-shaped surface 22b and a protrusion 22C directed toward the wedge-shaped gap surface, whereas in the case of the die 20, the surface 20b is recessed at a step. In addition, only the central projection 20c directed toward the wedge-shaped gap surface is interrupted.

The cutting edge 20a of this projection 20c and the cutting edge 22a of the die 22 have a spacing between them that corresponds exactly to the feed spacing.

In this case, the cutting edge 20a of the projection 20C is preferably configured to align with the front line of the punches 2, 4, whereas the cutting edge 222 of the projection 22C is arranged at the trailing edge of the rear punch 2, 4. It is shifted forward by approximately one space.

This is necessary because the rear punches 2 and 4
This is because the spacing of the leading edge of the forward punches 2, 4 with respect to the trailing edge exceeds the feed spacing by approximately the same amount.

In this way, during successive punching of containers, it is ensured that the approximately triangular wedge-shaped pieces punched out by the forward wedge-shaped piece punch 12 and the corresponding die 20 do not fall downwards from the die 20. can get.

This is because the wedge-shaped piece is cut out by punching on at least three sides, as in the case of the separate dies 16, 18, 22, and the cutting is always carried out when the sheet material is cut out by the punch 6 for the wedge-shaped piece. ,8,10.Dice 1 by 12
6, 18, 20, 22, so that the punched wedge-shaped pieces are inserted into the dies 16, 18.
, 20, 22, which are not undercut.

Furthermore, in this connection, the front cutting edges 2b, 14b of the upper tool in the feed direction and the corresponding front cutting edges 9d, 9f of the lower tool perform their cutting action.
It can be seen that this occurs only when a new sheet is being drawn into the machine and the front end of the sheet projects past the punching tool.

In the case of the next cut during continuous operation of the punching device, the area of the container cut by the rear cutting edges 2a, 14a is cut by the front cutting edges 9d, 9f of the lower tool, which cooperate with the front cutting edges 9d, 9f of the lower tool. It is punched out by cutting edges 2b, 14b.

During continuous operation, the block 1 of the lower tool is moved upwards by means of an actuating device, not shown, in each machine cycle, when the container still present in the extension of the sheet comes to rest in the area of the punching device. It will be done.

The wedge-shaped piece punches 6, 8, 10, 12 project above the level of the cutting edges γb, γd, 9b, 9d, 9e, 9f of the lower tool, so that the corresponding die 1 of the upper tool
Punches 6, 8, 1 working together with 6, 18, 20, 22
0,12 initially punch out a wedge-shaped piece.

This lower tool continues its upwardly directed movement so that the cutting edges 2a, 2b, 2c of the punch 2 then cut the cutting edges 7b, 9b, 9r, ll of the web of the block 1.
b, 13b 7 and correspondingly also the W edges 14a, 14b, 14c of the frame 14 come within the cutting edges 7 d t 9 d , 9 e of the block 1, whereby the remaining The contour of the container rim is completely stamped out.

After punching the container punched by punch 2,
The container rests on the step-like steps 7a, 9a, 11a, 13a, while the container punched in the area of the punch 4 rests on the web γ, 9, 11, 13 with its edge. ing.

After the end of the punching process, the lower tool moves downwards again.

The punched containers are supported by ejectors, which are not shown, so that they still remain at the level of unpunched containers and are moved out of the punching device by these ejectors during lifting. .

The containers can be punched out in such a way that significantly less C-sheet waste is produced.

In the most advantageous case, i.e. when the width of the flange-shaped container rim is sufficient so that it can be gripped by a feed device (not shown) on the side of the sheet, the waste material is It is a problem that only the wedge-shaped pieces that are pulled out are generated.

Furthermore, it has become clear that the punching of wedge-shaped pieces is necessarily always carried out in such a way that the tip of the wedge-shaped gap lies exactly within the cutting line, so that the already mentioned disadvantages and injuries occur when the punched-out It cannot occur on the edge of the container.

Rather than punching out containers individually, it is desirable to connect them in groups, for example, two containers, and a planned break line may be provided between the connected containers. If so, the punching device can be changed to a simpler type.

This embodiment is readily apparent from the foregoing and subsequent explanations, so that this embodiment will not be specifically illustrated.

For example, if a punching device for four containers as shown in FIGS. 1 and 2 is used to punch out two containers connected to each other via a predetermined break line, then
The punches 2 are not arranged longitudinally or laterally offset from each other, but in each case two punches 2 and two punches 4 are juxtaposed in the frame 14.

The cutting edges of the upper and lower tools are correspondingly configured as shown in FIGS. The difference is that the gaps are not provided with any cutting edges.

Within the tangents of the two punches 2 or the two punches 4, the corresponding web of the lower tool is approximately
Step-shaped step portions γa, 9a, lla, 13a illustrated in the figure
It is retracted to the level of , and is structured in a smooth manner.

A tool is arranged on the tangent between the two punches 2 and between the two punches 4 for producing a predetermined break line, so that in this case the punching process is carried out with the punching device according to the invention. First, a wedge-shaped piece is punched out, then the containers that are connected to each other are punched out, and finally a predetermined break line between the containers that are connected to each other is produced.

With this description, although the punching of the wedge-shaped part of the container and the marking of the predetermined break line take place virtually one after the other in time, this can be done in a single working process in the punching device. It has become clear that no difficulties can be identified, such as occur with known punching machines which operate in a sequential feed-cutting manner.

[Brief explanation of the drawing]

The drawings show one embodiment of the apparatus according to the invention, in which FIG. 1 is a perspective view of an upper tool and a lower tool according to the invention, and FIG. 2 is a bottom view of the upper tool. 1...Block, 2...Damp punch,
3...notch, 4...punch, 5...
... Notch, 6, 8, 10.12 ... Punch, γ, 9, 11, 13 ... Wafer, 14.
...Frame, 16, 18, 20, 22...
...Vacancy, 23, 24... Hole, γa, 9
a, 1 1 a, 1 3 a-=-... step part,
7b, 9b, 1lb, 13b, 2a, 2b, 2c, 14
a, 1 4 b t 1 4 c, 9 d, 9 e
+ 9 f , 1 6 a , 1 8 a , 20 a
, 22 a-cutting edge, 14d, 14e, 1 4
f, 14g, 14h... -- Frame edge range.

Claims (1)

[Scope of Claims] 1. Containers formed by deep drawing on a thermoplastic sheet, sealed with a cover sheet, and arranged in rows extending perpendicular to the longitudinal direction of the sheet, either individually or in groups. In the method of punching out wedges, wedges are first punched out of the sheet to round the corners of the container, and then the remaining edges of the container are punched out of the sheet and/or a predetermined break line is created between the containers. A method for punching out containers individually or in groups, characterized in that the steps are carried out one after another at different levels perpendicular to the direction of movement of the punching tool, one after the other, in one step. 2. The method according to claim 1, wherein the wedge-shaped piece is punched out in an upward direction with respect to the cooperation of a punch and a die, and the remaining edges are punched out and/or the predetermined break line is provided in a downward direction. . 3. An apparatus for punching out containers, individually or in groups, formed from a thermoplastic sheet by deep drawing, sealed with a cover sheet, and arranged in rows extending at right angles to the longitudinal direction of said sheet, Punches 6, 8, 10, 12 and the associated die 1 for punching out wedge-shaped pieces
6, 18, 20, 22 are respectively arranged on the punching tool 2 and the associated die 3 at different levels extending perpendicularly to the direction of movement of the punching tool. A device that punches out containers individually or in groups. 4 Punches 6, 8, 10, 1 for the wedge-shaped pieces mentioned above
2 is arranged on the lower tool and a corresponding die 16
, 18, 20, 22 are arranged on the upper tool, while a punch 2 is arranged on the upper tool for punching out the remaining edge of the container from the sheet and/or for marking a predetermined break line. 4. The device according to claim 3, wherein a corresponding die 3 is arranged on the lower tool. 5. The device according to claim 4, wherein the punches 2 for every other container to be punched are offset from one another in the transverse direction and, if appropriate, also in the longitudinal direction. . 6 An upper tool is assembled from the individualized punches 2, 4, the cross-sectional contour of which corresponds to the cross-sectional contour of the container rim, and the punch 4 is connected to the punch 2.
the punches 2, 4 are surrounded by a frame 14 which has cutting edges 14a, 14b, 14c outside the area of the punching punches 2; is located approximately at the same level as the cutting edge 2 a t 2 b t 2 c of the punch 2, whereas the edge area 1 4 d t 1 is located within the range of the punch 2 4 e is recessed, and also the cavities 16, 18, 20, 22 created by the cross-sectional contour of the punches 2, 4 between these punches 2, 4 and the frame 14 are wedge-shaped pieces. 6. The apparatus according to claim 5, forming a die for punching out. γ The cavity 16, 20, 22 existing between the punches 2, 4 and the frame 14 is configured as an approximately triangular wedge-shaped gap with three cusps. The device according to item 6. 8 The surfaces 202, 22a formed by the frame 14 in the sheet feeding direction are located at a right angle σ to the feeding direction; a surface 22b or step extending in the shape of a mountain starting from the apex; a protrusion directed into the cavity in a central region having a face 20b recessed by the part and said faces 20a, 22a facing the point formed by the punches 2, 4; 2
0c, 22C, and the distance between the mutually parallel edges 20a, 22a of the protrusion corresponds to the repitch of one feed of the sheet. 9. Apparatus according to claim 6, 7 or 8, in which the cutting edges 16a, 18a, 20a, 22a of the wedge-shaped dies 16, 1B, 20.22 are undercut. 10 A distance between the punch 2 or the frame 14, in which the front cutting edges 2b, i4b and the rear cutting edges 2a, 14a, slightly exceed the one-feed repitch of the sheet. 10. A device according to any one of claims 6 to 9, comprising: 11 The lower tool has cutouts 3, 5 for the container.
It consists of a block 1 having a cutout 3,
The web γ, 9, IL 13, which surrounds 5 and is formed between the cutouts, is lowered in order to receive the wedge-shaped piece punch 6, 8, 10, 12 at the point where the wedge-shaped piece is punched out. The web γ is provided with a stepped part and is in contact with the notch 3 into which the raised punch 2 of the upper tool enters.
, 9, 11, 13 are step-shaped steps γa toward the inside,
9a, lla, and 13a, and the web 7
, 9, 11, 13, the cutting edges 7b, 9b, 9f whose upper edges facing inward are assigned to the punch 2.
, 11b, 13b and which are also assigned to the frame part provided with cutting edges 14a, 14b, 14c, the webs γ, 9 extend outwardly into step-shaped steps γc, 9c, and web γ
, 9 form cutting edges γd, 9d, 9e which are assigned to the cutting edges 14a, 14b, 14c of the frame 14, and also the wedge-shaped piece punch 6. , 8, 10, 12 is at a higher level than the level placed by the upper edges of the webs γ, 9, 11, 13.
Apparatus according to any one of the clauses. 12 In order to punch out a group of adjacent containers with a predetermined break line, the punches 2 or 4, respectively juxtaposed to one another, are arranged at the same height and also have a lower side. A corresponding web located between the containers of the tool is configured with a smooth surface at its upper edge, the upper edge of the web facing the retracted punch 4. is located at the same level as the web with the cutting edge, while the web facing the punch 2 is located at a level that is lower relative to that level and is also at the same height. 12. The apparatus according to claim 11, further comprising a tool for producing a predetermined break line on the tangent line between the punches or the punches arranged at the center.