U.S. patent application number 13/103683 was filed with the patent office on 2011-11-17 for counterholder device for an apparatus for removing knockout parts from a workpiece sheet or the like, and apparatus having a counterholder device.
Invention is credited to Franz Vossen.
Application Number | 20110277607 13/103683 |
Document ID | / |
Family ID | 44751779 |
Filed Date | 2011-11-17 |
United States Patent
Application |
20110277607 |
Kind Code |
A1 |
Vossen; Franz |
November 17, 2011 |
COUNTERHOLDER DEVICE FOR AN APPARATUS FOR REMOVING KNOCKOUT PARTS
FROM A WORKPIECE SHEET OR THE LIKE, AND APPARATUS HAVING A
COUNTERHOLDER DEVICE
Abstract
Counterholder device (10; 10a to 10f) for an apparatus (100) for
removing knockout parts (1; 1f) from a workpiece sheet (2) or the
like, including a basic body (11) which can be arranged in a cutout
(104) of a die (105) of the apparatus (100) and which is connected
to a tongue-like portion (12; 12c) which projects into the cutout
(104) of the die (105), wherein the shape of the cutout (104) is
adapted to the shape of the knockout part (1; 1f) and wherein the
tongue-like portion (12; 12c) interacts with a knockout element
(103; 103d), which penetrates into the cutout (104) and in so doing
is arranged at a distance from the tongue-like portion (12; 12c),
and with an edge portion of the knockout part (1; 1f), wherein at
least the tongue-like portion (12; 12c) is rigidly formed in such a
way that it is arranged in a fixed position when interacting with
the knockout part (1; 1f) and the knockout element (103; 103d).
Inventors: |
Vossen; Franz;
(Stockach-Wahlwies, DE) |
Family ID: |
44751779 |
Appl. No.: |
13/103683 |
Filed: |
May 9, 2011 |
Current U.S.
Class: |
83/134 |
Current CPC
Class: |
Y10T 83/2146 20150401;
B26D 2007/1881 20130101; B26D 7/1818 20130101 |
Class at
Publication: |
83/134 |
International
Class: |
B21D 45/08 20060101
B21D045/08 |
Foreign Application Data
Date |
Code |
Application Number |
May 12, 2010 |
DE |
20 2010 006 741.3 |
Claims
1. Counterholder device (10; 10a to 10f) for an apparatus (100) for
removing knockout parts (1; 1f) from a workpiece sheet (2) or the
like, comprising a basic body (11) which can be arranged in a
cutout (104) of a die (105) of the apparatus (100) and which is
connected to a tongue-like portion (12; 12c) which projects into
the cutout (104) of the die (105), wherein the shape of the cutout
(104) is adapted to the shape of the knockout part (1; 1f) and
wherein the tongue-like portion (12; 12c) interacts with a knockout
element (103; 103d), which penetrates into the cutout (104) and in
so doing is arranged at a distance from the tongue-like portion
(12; 12c), and with an edge portion of the knockout part (1; 1f),
wherein at least the tongue-like portion (12; 12c) is rigidly
formed in such a way that it is arranged in a fixed position when
interacting with the knockout part (1; 1f) and the knockout element
(103; 103d).
2. Counterholder device according to claim 1, wherein the basic
body (11) and the tongue-like portion (12; 12c) consist of hard
material.
3. Counterholder device according to claim 2, wherein the basic
body (11) and the tongue-like portion (12; 12c) are connected to
one another in one piece and are formed as a stamped/bent part.
4. Counterholder device according to claim 2, wherein the basic
body (11) and the tongue-like portion (12; 12c) are connected to
one another in one piece and are formed as a cast part or milled
part.
5. Counterholder device according to claim 1, wherein the basic
body (11) is accommodated in the cutout (104) with a form and force
fit, and wherein the basic body (11) has a conical shape.
6. Counterholder device according to claim 1, wherein the upper
side of the basic body (11) and of the tongue-like portion (12;
12c) terminates at least approximately flush with the upper side of
the die (105).
7. Counterholder device according to claim 1, wherein the
tongue-like portion (12; 12c) has a structured shape on the side
facing away from the basic body (11).
8. Counterholder device according to claim 7, wherein the
structured shape is formed as a toothing (15; 15a; 15c; 15e;
15f).
9. Apparatus (100) for removing knockout parts (1) from a workpiece
sheet (2), having a counterholder device (10; 10a to 10e) according
to claim 1.
10. Counterholder device according to claim 2, wherein the basic
body (11) and the tongue-like portion (12; 12c) consist of metal.
Description
BACKGROUND OF THE INVENTION
[0001] The invention relates to a counterholder device for an
apparatus for removing knockout parts from a workpiece sheet or the
like.
[0002] Such a counterholder device is known from DE 697 01 218 T2.
The known counterholder device is characterized by a tongue-like
portion which projects into a cavity for a knockout part of a die,
with regions of the knockout part resting on the ends of the
tongue-like portions. During the knockout process, a knockout
member moves vertically from top to bottom and thus comes into
contact with the knockout part. In so doing, the knockout part is
pressed at its edge regions against the tongue-like portions of the
counterholder device. During the further downward movement of the
knockout member, the tongue-like portion of the counterholder
device moves downward together with the knockout member and with
the interposition of the knockout part. At the same time, an
elastic deformation of the tongue-like portion of the counterholder
device takes place. During the further downward movement of the
knockout part, the tongue-like portions are overstretched until
(with the knockout part already separated out) they snap over the
knockout parts and assume their original position again. It is thus
ensured that, during the subsequent upward movement of the knockout
member, the knockout part possibly adhering to the knockout member
is stripped from the knockout member at the tongue-like portion of
the counterholder device. The design and dimensioning of the known
counterholder device must be designed as a function of the
respective knockout part. Moreover, owing to the required
flexibility or elasticity of the tongue-like portion, the
counterholder device is usually produced from compression-molded
material whose durability or number of cycles is limited.
[0003] Furthermore, in the 1970s, the Applicant developed the
so-called "Power Stripping Dyn Stiftsystem". Here, the die is
provided with stud-like projections which serve as abutments when
pressing down the knockout parts. Owing to the resistance of the
stud-like projections, the necessary nonpositive engagement for a
relatively reliable knockout operation results between the knockout
part and the pins responsible for the downward movement of the
knockout part. A disadvantage here, however, is that the stud-like
protuberances on the die tend to wear as a result of the constant
friction between the knockout parts and said protuberances.
Consequently, it is relatively difficult to ensure the functional
reliability of the knockout process over a prolonged period.
SUMMARY OF THE INVENTION
[0004] Starting from the prior art represented, the object on which
the invention is based is to develop a counterholder device for an
apparatus for removing knockout parts from a workpiece sheet or the
like such that, together with a high process reliability, a very
long service life of the counterholder device is made possible.
This object is achieved in the case of a counterholder device as
disclosed herein. The idea behind the invention is to reduce the
wear of the counterholder device by means of rigid, tongue-like
portions.
[0005] Advantageous developments of the counterholder device
according to the invention are also specified herein. Falling
within the scope of the invention are all combinations of at least
two features disclosed in the claims, the description and/or the
figures.
[0006] With particular preference, it is provided that the basic
body and the tongue-like portion consist of hard material, in
particular of metal. Owing to the metal design, the counterholder
devices have a particularly high durability or service life and,
moreover, can be handled particularly easily, for example can be
fitted into the corresponding recesses of the die.
[0007] The counterholder devices can be produced particularly
economically and cost-effectively if the basic body and the
tongue-like portion are connected to one another in one piece and
are formed as a stamped/bent part.
[0008] In an alternative embodiment, it is also possible that the
basic body and the tongue-like portion are connected to one another
in one piece and are formed as a cast part or milled part.
[0009] For simple fastening of the counterholder device in the die,
it is provided that the basic body is accommodated in the recess
with a form and force fit, and that the basic body has a conical
shape. Given a correspondingly accurately produced cavity, the
conical shape moreover makes possible or ensures an exact height
positioning of the counterholder device in the die.
[0010] In this case, it is also particularly provided that the
upper side of the basic body and of the tongue-like portion
terminates at least approximately flush with the upper side of the
die. This also reliably prevents a catching of parts of the blanks
during their transport above the die.
[0011] Furthermore, it is particularly preferred if the tongue-like
portion has a structured shape on the side facing away from the
basic body. This makes it possible in an advantageous manner to
ensure a high operational reliability of the apparatus.
[0012] It is particularly preferred here if the structured shape is
formed as a toothing. By means of such toothings, in particular by
means of fine toothings, it becomes possible to adapt the
counterholder device to the respective waste contours to be knocked
out.
[0013] The invention also comprises an apparatus for removing
knockout parts from a workpiece or the like, having a counterholder
device according to the invention. Such an apparatus has the
advantage of a particularly high operational reliability and
service life.
BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Further advantages, features and details of the invention
will emerge from the following description of preferred exemplary
embodiments and with reference to the drawings, in which:
[0015] FIG. 1 shows a longitudinal section through an apparatus for
removing knockout parts from a workpiece sheet or the like using
counterholder devices according to the invention,
[0016] FIG. 2 shows a plan view of the die of the apparatus
according to FIG. 1,
[0017] FIG. 3 and FIG. 4 show exemplary embodiments of
counterholder devices according to the invention, in each case in a
perspective view, and
[0018] FIG. 5 to FIG. 10 show partially simplified plan views of
counterholder devices according to the invention in order to
illustrate the different fine toothings in the region of the
tongue-like portions.
DETAILED DESCRIPTION
[0019] Like parts or parts having the same function are provided
with identical reference numbers in the figures.
[0020] FIGS. 1 and 2 depict an apparatus 100 for removing knockout
parts 1 from a workpiece sheet 2 or the like.
[0021] The workpiece sheet 2 is in particular a cardboard or a
corrugated board and the knockout part 1 is a part which is
connected via webs or the like to the remaining workpiece sheet 2
and which is intended to be detached from the workpiece sheet 2 by
means of the apparatus 100. Such an operation is also referred to
as knocking out.
[0022] The apparatus 100 comprises a lower part 101 which is
arranged in a fixed position, preferably consisting of multi-glued
plywood, and an upper part 102 which is arranged movably up and
down with respect to the lower part 101 and which likewise
preferably consists of multi-glued plywood. Arranged on the
underside of the upper part 102 is preferably a plurality of
knockout elements 103 which, in the exemplary embodiment
represented, are formed as bent sheet-metal parts or else as steel
pins. The knockout elements 103 can in particular also be designed
in accordance with EP 1 068 053 B1 of the Applicant and have, for
example, additional pushing teeth for the targeted movement of the
knockout part 1.
[0023] As can best be seen from FIG. 2, the lower part 101, which
is also designated as "knockout board", has a cutout 104 which is
rectangular in the exemplary embodiment and whose outline is
adapted to the shape or size of the knockout part 1 in such a way
that the knockout part 1 is somewhat smaller than the cavity 104
and is enclosed at a distance thereby. Moreover, for the sake of
better clarity, FIG. 2 only shows the knockout part 1 but not the
remaining workpiece sheet 2. Owing to the design of the cavity 104
in the lower part 101, the lower part 101 acts as a die 105.
[0024] The cavity 104 is equipped with additional recesses 107 in
order to accommodate counterholder devices 10 according to the
invention. Moreover, like the cavity 104, the recesses 107 are
produced or formed in particular by means of laser beam cutting
devices. The recess 107 has a first region 108 which is
approximately rectangular in plan view and which is connected to
the cavity 104 via a second region 109 which is approximately
trapezoidal in the exemplary embodiment. Moreover, both the cavity
104 and the recess 107 are formed over the entire height or
thickness of the lower part 101.
[0025] The apparatus 100 according to FIGS. 1 and 2 has four
counterholder devices 10 according to the invention which are each
arranged in pairs, opposite one another in the exemplary
embodiment, on the two longitudinal sides of the cavity 104.
[0026] As can best be seen from FIGS. 3 and 4, the counterholder
device 10 has a block-shaped basic body 11 which is preferably
connected in one piece to a tongue-like portion 12. While the
counterholder device 10a according to FIG. 3 is produced from a
sheet-metal part by a stamping/bending process, the counterholder
device 10b according to FIG. 4 has a solid basic body 11 on which
the portion 12 is integrally formed. In this case, the
counterholder device 10b can be formed for example as a milled part
or else as a cast part.
[0027] The basic body 11 is conically formed such that, when
inserted or fastened in the first region 108 of the recess 107, it
is securely accommodated in the recess 107 by clamping or pressing,
while the upper side of the basic body 11 and of the portion 12
preferably terminates flush with the upper side of the lower part
101.
[0028] What is essential is that the counterholder devices 10, 10a
or 10b consist of hard material, in particular of metal, and that
the tongue-like portion 12 is rigidly formed or arranged in a
direction parallel to the direction of movement of the upper part
102 of the apparatus 100.
[0029] The end portions or end regions 14 of the tongue-like
portions 12 which face away from the basic body 11 preferably have
a fine toothing 15. Whereas in the exemplary embodiment represented
in FIG. 5 the fine toothing 15a of the counterholder device 10a is
formed over the entire width of the tongue-like portion 12, the
tongue-like portion 12c of the counterholder device 10c of FIG. 6
has a widened head region 17 which likewise has a fine toothing 15c
over its entire width. The end region 14d of the counterholder
device 10d of FIG. 7 has a semicircular or concave cutout 18 which
interacts with a pin-like knockout element 103d. By contrast, the
counterholder device 10e according to FIG. 8 has a convexly formed
end region 14e with a fine toothing 15e. The counterholder device
10f according to FIGS. 9 and 10 is intended in particular for
small, round knockout parts 1f. For this purpose, the counterholder
device 10f has a star-shaped fine toothing 15f with internal points
19. Here, according to FIG. 10, the knockout part 1f rests on the
points 19 which are concealed in said figure. The knockout element
preferably used for the counterholder device 10f is a
cross-sectionally round pin which, during its downward movement,
penetrates into the opening of the counterholder device 10f which
is bounded by the points 19.
[0030] The particular shape of the fine toothings 15 or the
dimensioning of the tongue-like portions 12 should in particular be
adapted to the particular application, i.e. in particular to the
shape of the knockout part 1 and the material used.
[0031] The mode of operation of the apparatus 100 in conjunction
with the counterholder elements 10 according to the invention is as
follows: as soon as the workpiece sheet 2 is positioned with its
knockout part 1 in the region of the cavity 104 of the apparatus
100, the upper part 102 begins to move downward, and the knockout
elements 103, which are arranged at a distance from the
counterholder elements 10 in the direction of movement, come into
operative connection with the upper side of the knockout part 1. In
so doing, the knockout elements 103 press the knockout part 1 into
the cavity 104, and the edge regions of the knockout part 1 come
into operative connection with the tongue-like portions 12, in
particular with the fine toothings 15 of the counterholder elements
10. This results in a frictional engagement between the knockout
part 1, the counterholder devices 10 and the knockout elements
103.
[0032] As the knockout part 1 is pressed down further into the
cavity 104, the (web-like) connections between the knockout part 1
and the workpiece sheet 2 break, with the result that the knockout
part 1 is pressed into the cavity 104 with further deformation. It
is essential here that the tongue-like portions 12 of the
counterholder devices 10 remain at least substantially rigid at
their location, i.e. are not pressed into the cavity 104. As the
knockout part 1 is pressed into the cavity 104, the knockout part 1
is here deformed until its edge regions overcome the end regions 14
of the tongue-like portions 12 of the counterholder devices 10,
such that the knockout part 1 passes into a waste container or the
like situated below the lower part 101. During the subsequent
upward movement of the upper part 102 of the apparatus 100, it is
ensured by the rigid counterholder devices 10 that a knockout part
1 possibly adhering to the knockout elements 103 bears against the
underside of the counterholder devices 10 and is prevented by these
from making a further upward movement or is stripped from the
knockout elements 103. This ensures a reliable separation of the
already separated-out knockout part 1 from the knockout elements
103.
[0033] The counterholder devices 10 described so far can be adapted
or modified in numerous ways without departing from the idea of the
invention. In particular, the shape and the choice of the material
of the counterholder device is not limited to the embodiments which
have been illustrated or described. Furthermore, it can also be
provided that the counterholder devices 10 have, in particular for
the use for relatively large, round knockout parts 1, 1f, a
receptacle on both sides, i.e. arranged opposite one another.
* * * * *