Stripper Unit

Abstract

A stripper unit that includes an unround cylindrical pressure plate, wherein the outer contour of the unround cylinder shape in a cross section transversely through the pressure plate defines the installation space thereof transversely to the direction of extent of the cylinder. A stripper plate is also provided, placed on the end face of the pressure plate and mounted on spring elements such that it can be moved up and down with respect to the pressure plate, wherein the stripper plate is formed geometrically in such a way that it fits completely flush within the outer contour of the cylinder shape of the pressure plate and does not protrude beyond it.

Description

CROSS REFERENCE TO RELATED APPLICATIONS

[0001] This application is a 35 U.S.C. .sctn. 371 national phase application of International Application No.: PCT/EP2020/067282, filed Jun. 22, 2020, which claims the benefit of priority under 35 U.S.C. .sctn. 119 to German Patent Application No.: 20 2019 106 189.8, filed Nov. 7, 2019, the contents of which are incorporated herein by reference in their entirety.

FIELD

[0002] The invention relates to a stripper with a particularly compact construction.

BACKGROUND

[0003] The statements in this section merely provide background information related to the present disclosure and several definitions for terms used in the present disclosure and may not constitute prior art.

[0004] A variety of embodiments of mechanical strippers for punch retaining plates are known, such as, appropriate solutions for standard punch retaining plates according to automotive standard of the working group (BAK/NAAMS) for Ball Lock, heavy and light load, as well as for shoulder punches.

[0005] The strippers are typically guided precisely in a housing on the shoulder and on the outer diameter over the entire stroke. Some of the solutions have a stripper housing, precision-drilled and rolled smoothly on the inside, to effect good sliding and supporting forces.

[0006] The housing can be made of stable, pre-cured steel and provided with corrosion protection. Critical active areas can be manipulated with precision, so that best angularity and alignment is obtained, so that even upon exposure to side thrusts a long service life is achieved.

[0007] However, it is desirable to reduce the structure and thus the outer dimensions and optimize the required installation space.

[0008] WO 2007018695A3 discloses a stripper unit which contains a precision threaded plug that preloads a mechanical die spring, which, in turn, preloads the movable or moving stripper adjacent the punch tip. The precision threaded plug simultaneously accurately positions the stripper unit on a commercially available ball-lock punch retainer. The stripper unit is entirely self-contained on the face of the ball-lock retainer, thus minimizing the space required on the pressure plate.

[0009] A disadvantage of the known embodiments is the fact that the stripper unit protrudes from the punch retaining plate, which requires additional installation space and in less than optimal force distribution.

SUMMARY

[0010] The present disclosure is therefore based on the object of providing a stripper in which the installation space is optimized. This object is achieved by a stripper unit, comprising an unround cylindrical pressure plate, wherein the outer contour of the unround cylinder shape in a cross section transversely through the pressure plate defines the installation space thereof transversely to the direction of extent of the cylinder, and a stripper plate is provided, placed on the end face of the pressure plate and mounted on spring elements such that it can be moved up and down with respect to the pressure plate, wherein the stripper plate is formed geometrically in such a way that it fits completely flush within the outer contour of the cylinder shape of the pressure plate and does not protrude beyond it.

[0011] Further areas of applicability will become apparent from the description provided herein. It should be understood that the description and specific examples are intended for purposes of illustration only and are not intended to limit the scope of the present disclosure.

BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order that the disclosure may be well understood, there will now be described various forms thereof, given by way of example, reference being made to the accompanying drawings, in which:

[0013] FIG. 1 shows a plan view of a disadvantageous solution from the prior art;

[0014] FIG. 2 shows an isometric view of an exemplary embodiment of a stripper unit according to the teachings of the present disclosure;

[0015] FIG. 3 shows a sectional view through FIG. 2;

[0016] FIG. 4 shows a plan view on FIG. 2;

[0017] FIG. 5 shows an isometric view of a pressure plate;

[0018] FIG. 6 shows an isometric view of a stripper plate; and

[0019] FIG. 7 shows an isometric view of a stripper socket.

[0020] In the following, the invention will be explained in more detail with reference to FIGS. 1 to 7, wherein like reference numerals in the figures indicate the same structural and/or functional features.

DETAILED DESCRIPTION

[0021] The following description is merely exemplary in nature and is in no way intended to limit the present disclosure or its application or uses. It should be understood that throughout the description, corresponding reference numerals indicate like or corresponding parts and features.

[0022] According to one aspect of the present disclosure, an unround cylindrical pressure plate is provided, wherein the outer contour of the unround cylinder shape, in a cross section transversely through the pressure plate, defines the installation space thereof transversely to the direction of extent of the cylinder, and a stripper plate is provided, placed on the end face of the pressure plate and mounted on spring elements such that it can be moved up and down with respect to the pressure plate, wherein the stripper plate is formed geometrically in such a way that it fits completely flush within the outer contour of the cylinder shape of the pressure plate and does not protrude beyond it.

[0023] According to another aspect of the present disclosure, it is provided that further a punch retaining plate is provided, on which the stripper unit is installed, and the stripper plate and the punch retaining plate are geometrically arranged to each other and formed in such a way, that the stripper plate, in the installed state, fits completely flush within the outer contour of the cylinder shape of the punch retaining plate and does not protrude beyond it.

[0024] One advantageous solution of the present disclosure is when the stripper plate has the same cross section as the pressure plate and, further advantageous, as the punch plate for mounting in the tool.

[0025] According to yet another aspect of the present disclosure, it is provided that the stripper plate has a cylindrical recess into which a stripper socket is inserted, wherein the socket preferably, on one side, has an open receptacle for a punch, for example.

[0026] It also may be advantageous if the stripper plate at an end face forms a stepped end face thereby dividing the end face by a step separated into two partial surfaces which are in different planes.

[0027] Another aspect of the present disclosure provides that the recess for the stripper socket is arranged in the first partial surface opposite to which the second partial surface protrudes in the direction of extent of the cylinder.

[0028] A further likewise aspect of the present disclosure provides that the top of the stripper socket is in a common plane together with the top of the second partial surface, or is set back relative to the plane defined by the second partial surface.

[0029] One design of the present disclosure provides that the stripper socket has a head plate formed with a collar, which head plate is formed on one side with a linearly extending side edge surface which abuts against a corresponding side edge surface on the stripper plate.

[0030] Also favorable is a configuration in which the corresponding side edge surface is formed on the stripper plate by the step.

[0031] The present disclosure may also include an implementation in which the stripper plate has a part-circular cross section in the area of the first partial surface, which merges at the end of the part-circular cross section to a linear course, in each case, and this linear course preferably extends symmetrically to the cylinder extension axis almost up to the step, in each case.

[0032] Similarly, another solution for the optimization of installation space, it is further provided that the stripper plate has a part-circular cross section in the area of the second partial surface and has the same cross section as the pressure plate.

[0033] Furthermore, it may be advantageous if the stripper socket has a head plate formed with a collar, which head plate is formed with a part-circular side edge surface which is flush against the side surface of the stripper plate or is set back relative to the same.

[0034] Further, it may be desirable if the stripper plate has a symmetrical cross section in the area of the second partial surface, which cross section is bounded on one side edge by the step and bounded by two part-circular sections, respectively, which are interconnected by a linear intermediate area.

[0035] It is likewise of advantage, when the printing plate and the stripper plate in the installed state each have a flush centering opening into which a guide pin is inserted, wherein the guide pin preferably has a thread at its one end face, which protrudes from the lower plane of the pressure plate.

[0036] To better illustrate the disadvantages of the prior art, FIG. 1 illustrates a non-installation-space-optimized solution, in which the stripper protrudes beyond the pressure plate or the punch retaining plate.

[0037] FIG. 2 illustrates an isometric view of a stripper unit 1 formed according to the teachings of the present disclosure, and FIG. 3 illustrates a sectional view and FIG. 4 illustrates a top view thereof.

[0038] The stripper unit 1 has an unround cylindrical pressure plate 10, as shown in detail in FIG. 4. The outer contour is clearly visible in the view of FIG. 3 that shows a cross section transversely through the pressure plate 10 and the installation space thereof is defined transversely to the direction of extent of the cylinder.

[0039] Furthermore, the stripper unit 1 has a stripper plate 20 which is installed on the end face of the pressure plate 10 to define a distance and mounted on spring elements 40 such that it can be moved up and down with respect to the pressure plate 10.

[0040] The stripper plate 20 is formed geometrically in such a way that it fits completely flush within the outer contour of the cylinder shape of the pressure plate 10 and does not protrude beyond it as in the example of FIG. 1. Such a flush contour is achieved in that the spring elements 40 such as, for example, a compression spring or elastomeric spring is not arranged within the socket contour of the stripper socket 30. This decoupling offers the advantage that the stripper socket 30 is also located entirely within the contour of the stripper plate 20 and the stripper unit 1.

[0041] Also not shown is a punch retaining plate, on which the stripper unit 1 is or may be installed, and the stripper plate 20 and the punch retaining plate are geometrically also arranged to each other and formed in such a way, that the stripper plate 20 in the installed state fits completely flush within the outer contour of the cylinder shape of the punch retaining plate and does not protrude beyond it.

[0042] As already explained, for this purpose the spring elements (e.g., compression springs 40) are arranged in the stripper plate 20 adjacent to the stripper socket 30 and are thus separated from them.

[0043] The stripper plate 20 has a cylindrical recess into which the stripper socket 30 (shown in detail in FIG. 6) is inserted. The stripper socket 30 has an annular circumferential groove 35 into which a retaining ring 37 engages in order to fix the stripper socket 30 at the stripper plate 20.

[0044] At the end face pointing upwards in the figure, the stripper plate 20 has a stepped end face 21, wherein the end face 21 is divided by a step 21 separated into two partial surfaces 21a, 21b which thereby are in different planes. Said recess 25 for the stripper socket 30 is arranged handily in the first partial surface 21a in an installation space-optimized manner. In the installed state, the top of the stripper socket 30 forms a common plane or surface plane with the top of the second partial surface 21b.

[0045] As can also be seen from FIGS. 2 and 3, the stripper socket 30 has a head plate 32 formed with a collar 31, which is formed on one side (side pointing to the right in the plane of the drawing) with a linearly extending side edge surface 34 which abuts in a form-fitting manner against a corresponding side edge surface at the stripper plate 20. Said corresponding side edge surface on the stripper plate 20 is implemented by step 21.

[0046] Overall, the stripper unit 1 has an optimized shape and thus an optimized installation space. For this purpose, the stripper plate 20 has a part-circular cross section (section TQ) in the area of the first partial surface 21a, which merges at the end of the part-circular cross section to a linear course (LV) and this linear course preferably extends symmetrically to the cylinder extension axis almost up to the step 21, in each case.

[0047] The stripper socket 30 has a head plate 32 formed with a collar 31, which (in addition to the aforementioned side edge contact surface 34) is formed with a part-circular side edge surface which is flush with the side surface TQ of the stripper plate 20.

[0048] In the area of the second partial surface 21a, the stripper plate 20 has a symmetrical cross section which is bounded on one side edge by the step 21 and by two part-circular sections 26, which are interconnected by a linear intermediate area 27, which is clearly visible in the view of FIG. 4.

[0049] Next, it can be seen from the figures that the pressure plate 10 and the stripper plate 20 in the installed state each have a flush centering opening 19, 29, into which a guide pin 50 is inserted, wherein the guide pin has a thread at its one end-face, which protrudes from the lower plane of the pressure plate 10.

[0050] Within this specification, embodiments have been described in a way which enables a clear and concise specification to be written, but it is intended and will be appreciated that embodiments may be variously combined or separated without parting from the invention. For example, it will be appreciated that all preferred features described herein are applicable to all aspects of the invention described herein.

[0051] The implementation of the invention is not limited to the preferred exemplary embodiments specified above. Rather, a number of variants are conceivable which make use of the solution shown even in the case of fundamentally different embodiments. Thus, it will be appreciated that the invention is susceptible to modification, variation and change without departing from the proper scope and fair meaning of the accompanying claims.

Claims

1. A stripper unit, comprising: an unround cylindrical pressure plate, wherein the outer contour of the unround cylinder shape in a cross section transversely through the pressure plate defines the installation space thereof transversely to the direction of extent of the cylinder, and a stripper plate, placed on the end face of the pressure plate and mounted on spring elements such that it can be moved up and down with respect to the pressure plate, wherein the stripper plate is formed geometrically in such a way that it fits completely flush within the outer contour of the cylinder shape of the pressure plate and does not protrude beyond it.

2. The stripper unit according to claim 1, characterized in that further a punch retaining plate is provided, on which the stripper unit is installed, and the stripper plate and the punch retaining plate are geometrically arranged to each other and formed in such a way, that the stripper plate in the installed state fits completely flush within the outer contour of the cylinder shape of the punch retaining plate and does not protrude beyond it.

3. The stripper unit according to claim 1, characterized in that the stripper plate has the same cross section as the pressure plate.

4. The stripper unit according to claim 1, characterized in that the stripper plate has a cylindrical recess (A) into which a stripper socket is inserted.

5. The stripper unit according to claim 4, characterized in that the stripper plate at an end face forms a stepped end face thereby dividing the end face by a step separated into two partial surfaces which are in different planes.

6. The stripper unit according to claim 4, characterized in that the recess (A) is arranged in the first partial surface opposite to which the second partial surface protrudes in the direction of extent of the cylinder.

7. The stripper unit according to claim 6, characterized in that the top of the stripper socket is in a common plane together with the top of the second partial surface, or is set back relative to the plane defined by the second partial surface.

8. The stripper unit according to claim 4, characterized in that the stripper socket has a head plate formed with a collar, which head plate is formed on one side with a linearly extending side edge surface which abuts against a corresponding side edge surface on the stripper plate.

9. The stripper unit according to claim 8, characterized in that the corresponding side edge surface is formed on the stripper plate by the step.

10. The stripper unit according to claim 1, characterized in that the stripper plate has a part-circular cross section in the area of the first partial surface, which cross section merges at the end of the part-circular cross section to a linear course and this linear course preferably extends symmetrically to the cylinder extension axis almost up to the step, in each case.

11. The stripper unit according to claim 1, characterized in that the stripper plate has a part-circular cross section in the area of the second partial surface, has the same cross section as the pressure plate.

12. The stripper unit according to claim 4, characterized in that the stripper socket has a head plate formed with a collar, which head plate is formed with a part-circular side edge surface which is flush against the side surface of the stripper plate or is set back relative to the same.

13. The stripper unit according to claim 5, characterized in that the stripper plate has a symmetrical cross section in the area of the second partial surface, which cross section is bounded on one side edge by the step and bounded by two part-circular sections, which are interconnected by a linear intermediate area.

14. The stripper unit according to claim 1, characterized in that the pressure plate and the stripper plate in the installed state each have a flush centering opening into which a guide pin is inserted, wherein the guide pin preferably has a thread at its one end face, which protrudes from the lower plane of the pressure plate.

15. The stripper unit according to claim 2, characterized in that the stripper plate has the same cross section as the pressure plate.

16. The stripper unit according to claim 3, characterized in that the stripper plate has a cylindrical recess (A) into which a stripper socket is inserted.

17. The stripper unit according to claim 5, characterized in that the recess (A) is arranged in the first partial surface opposite to which the second partial surface protrudes in the direction of extent of the cylinder.

18. The stripper unit according to claim 7, characterized in that the stripper socket has a head plate formed with a collar, which head plate is formed on one side with a linearly extending side edge surface, which abuts against a corresponding side edge surface on the stripper plate.

19. The stripper unit according to claim 5, characterized in that the stripper plate has a part-circular cross section in the area of the first partial surface, which cross section merges at the end of the part-circular cross section to a linear course and this linear course preferably extends symmetrically to the cylinder extension axis almost up to the step, in each case; wherein the stripper plate has a part-circular cross section in the area of the second partial surface, has the same cross section as the pressure plate.

20. The stripper unit according to claim 10, characterized in that the stripper plate has a symmetrical cross section in the area of the second partial surface, which cross section is bounded on one side edge by the step and bounded by two part-circular sections, which are interconnected by a linear intermediate area; wherein the pressure plate and the stripper plate in the installed state each have a flush centering opening into which a guide pin is inserted, wherein the guide pin preferably has a thread at its one end face, which protrudes from the lower plane of the pressure plate.