EP0891844A1 - Anchoring means for punching tools - Google Patents
Anchoring means for punching tools Download PDFInfo
- Publication number
- EP0891844A1 EP0891844A1 EP97112122A EP97112122A EP0891844A1 EP 0891844 A1 EP0891844 A1 EP 0891844A1 EP 97112122 A EP97112122 A EP 97112122A EP 97112122 A EP97112122 A EP 97112122A EP 0891844 A1 EP0891844 A1 EP 0891844A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- accessory
- fixture
- knurled
- fixture according
- punching tools
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B26—HAND CUTTING TOOLS; CUTTING; SEVERING
- B26F—PERFORATING; PUNCHING; CUTTING-OUT; STAMPING-OUT; SEVERING BY MEANS OTHER THAN CUTTING
- B26F1/00—Perforating; Punching; Cutting-out; Stamping-out; Apparatus therefor
- B26F1/38—Cutting-out; Stamping-out
- B26F1/44—Cutters therefor; Dies therefor
- B26F1/46—Loose press knives
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B26—HAND CUTTING TOOLS; CUTTING; SEVERING
- B26F—PERFORATING; PUNCHING; CUTTING-OUT; STAMPING-OUT; SEVERING BY MEANS OTHER THAN CUTTING
- B26F1/00—Perforating; Punching; Cutting-out; Stamping-out; Apparatus therefor
- B26F1/38—Cutting-out; Stamping-out
- B26F1/44—Cutters therefor; Dies therefor
- B26F2001/4463—Methods and devices for rule setting, fixation, preparing cutting dies
Definitions
- the present invention relates to an improved accessory/fixture for punching tools.
- Tools for punching material in sheet form such as leather, hide, imitation leather, cardboard, etcetera to produce leather goods, shoes, covers for cases and agendas, or other items, are conventionally often combined with elements adapted to obtain one or more holes arranged in various manners on the surface of the shape produced by the cut.
- a typical case is that of so-called "English-style” shoes, wherein the surface of the upper is provided with perforations forming ornamental patterns.
- Said elements are commonly known as perforators and needles in the field, and their association with the punching tools occurs by push-fit insertion in through holes formed on the stiffening cross-members of said punching tools or on laminar elements that are coupled inside the structures in a cantilevered fashion.
- Each one of these shaped and non-shaped perforators, needles, and the like is substantially constituted by an elongated cylindrical metal body wherein at least one end tapers and forms a sharp cutting edge or a point.
- An opening for discharging the cutting scrap can be provided on the body, close to the respective tapered end, and connected to the inside thereof.
- the perforators and the needles are provided in various size series as regards the diameter of the cutting hole and with one or two sharp or pointed ends.
- the insertion and the coupling of the perforator or of the needle relative to the respective supporting element occurs by interference fit, by providing on said support a hole the diameter whereof is slightly smaller than the diameter of the body that must be inserted therein.
- the degree of interference is a function of the locking force to be applied; said force must be simply sufficient to maintain correct positioning during the handling of the punching tool.
- Insertion is performed with the aid of a press, and currently there are considerable assembly difficulties, despite the insertion guide constituted by the end taper, leading ultimately to incorrect insertions as regards exact positioning.
- An equivalent drawback affects the needles, the function whereof is to indicate a precise reference in joining a plurality of parts, for example by tracing the path of a plurality of stitches by perforation.
- a principal aim of the present invention is therefore to provide an improved accessory/fixture that can be mounted on punching tools in a particularly simple and precise manner.
- a consequent primary object is to provide an accessory/fixture the assembly whereof does not require particular provisions.
- Another important object is to provide an improved accessory/fixture that can be manufactured with simple mechanical machining processes.
- Another object is to provide an improved accessory/fixture that maintains a low cost and can be mass-produced.
- an improved accessory/fixture for punching tools of the type comprising an elongated metallic body with at least one end that tapers and forms a sharp cutting edge or a point, said accessory/fixture being characterized in that said body has a knurled annular portion on its outer surface.
- a punching tool is generally designated by the reference numeral 10 and is constituted by a shaped metallic band 11 the profile whereof forms a figure that is closed but can, in some instances, be open as well.
- the band 11 is arranged edgeways and therefore has, in this case, two sharp cutting edges, designated by the reference numerals 12 and 13 respectively.
- a single sharp edge may be provided in alternative embodiments.
- a cantilevered laminar element 14 is welded internally to said band 11 in a central region and forms the support for a plurality of perforators 15 or, as an alternative, for needles, which will be described better hereinafter and are adapted to obtain a corresponding plurality of holes around the cutting edge.
- Each perforator 15 is constituted, in the case being considered, by a cylindrical elongated metallic body 16 with two tapered ends, respectively 17 and 18, that are hollow so as to form a sharp cutting edge, designated by the reference numerals 19 and 20 respectively.
- each perforator 15 is equal to the distance between the two edges 12 and 13 of the punching tool 10 which, in the case being considered, are both sharp, as mentioned earlier.
- An opening for discharging the cutting scrap designated by the reference numerals 21 and 22 respectively, is present close to each end 17 and 18, and is connected to its interior.
- Said openings 21 and 22 are conveniently shaped so as to guide the discharge of the scrap.
- the body 16 has, in a central region on the outer surface, a knurled annular portion 23 constituted in practice by a plurality of longitudinal parallel raised portions that increase its diametrical bulk by approximately one tenth with respect to the nominal value.
- the knurled portion 23 entirely affects the coupling region, by insertion in an adapted hole 24 the diameter whereof is equal to the nominal diameter of the perforator 15 that is present on the laminar element 14.
- the insertion of the perforator 15 in the hole 24 occurs first manually, by positioning one of the tapered ends 17 and 18 in said hole 24, and then by means of a press, until the knurled portion 23 assumes the correct position.
- the longitudinal raised portions of the knurling 23 act as guides for the exact mutual positioning of the coupled parts, and their larger diametrical bulk with respect to that of the hole 24 produces a pressure between the parts that is sufficient to achieve a considerable locking force.
- the knurling operation is conveniently performed after the machining of the perforator on the machine tool and before said perforator is tempered and optionally electroplated with nickel or chromium.
- each needle 115 is constituted by a cylindrical elongated metal body 116 with two tapered and pointed ends, respectively 117 and 118.
- the body 116 has, in a central region, on the outer surface, a knurled annular portion 123 constituted in practice by a plurality of longitudinal parallel raised portions that increase its diametrical bulk by approximately one tenth with respect to the nominal value.
- the execution of the knurling on the outer surface of the perforator 15 or of the needle 115 in fact allows to provide punching tools that are qualitatively better than current ones as regards the exact positioning of the perforators and therefore cutting combined with perforation and as regards the exact positioning of the references formed with the needles.
- Another important advantage is constituted by easy insertion in the holes of the supports of the punching tool.
- the materials employed may be any according to the requirements.
Abstract
An improved accessory/fixture for punching tools, of
the type comprising an elongated metallic body (16) with at
least one end (17, 18) that tapers and forms a sharp cutting
edge or a perforating point (19, 20), the body having a
knurled annular portion (23) on its outer surface.
Description
The present invention relates to an improved
accessory/fixture for punching tools.
Tools for punching material in sheet form, such as
leather, hide, imitation leather, cardboard, etcetera to
produce leather goods, shoes, covers for cases and agendas,
or other items, are conventionally often combined with
elements adapted to obtain one or more holes arranged in
various manners on the surface of the shape produced by the
cut.
A typical case is that of so-called "English-style"
shoes, wherein the surface of the upper is provided with
perforations forming ornamental patterns.
Said elements are commonly known as perforators and
needles in the field, and their association with the
punching tools occurs by push-fit insertion in through holes
formed on the stiffening cross-members of said punching
tools or on laminar elements that are coupled inside the
structures in a cantilevered fashion.
Each one of these shaped and non-shaped perforators,
needles, and the like, is substantially constituted by an
elongated cylindrical metal body wherein at least one end
tapers and forms a sharp cutting edge or a point.
An opening for discharging the cutting scrap can be
provided on the body, close to the respective tapered end,
and connected to the inside thereof.
The perforators and the needles are provided in various
size series as regards the diameter of the cutting hole and
with one or two sharp or pointed ends.
The insertion and the coupling of the perforator or of
the needle relative to the respective supporting element
occurs by interference fit, by providing on said support a
hole the diameter whereof is slightly smaller than the
diameter of the body that must be inserted therein.
The degree of interference is a function of the locking
force to be applied; said force must be simply sufficient to
maintain correct positioning during the handling of the
punching tool.
Insertion is performed with the aid of a press, and
currently there are considerable assembly difficulties,
despite the insertion guide constituted by the end taper,
leading ultimately to incorrect insertions as regards exact
positioning.
This, of course, is a significant drawback, since in
most cases each perforator is part of a set adapted to
produce an ornamental pattern by perforation, so that the
exact position of the various perforators is extremely
important.
An equivalent drawback affects the needles, the
function whereof is to indicate a precise reference in
joining a plurality of parts, for example by tracing the
path of a plurality of stitches by perforation.
Attempts to solve the problem by providing a flared
annular guiding region between the tapered region and the
remaining part have turned out to be unadapted, particularly
for perforators provided with a discharge opening, owing to
the fact that the presence of said opening does not allow to
produce said flared portion.
A principal aim of the present invention is therefore
to provide an improved accessory/fixture that can be mounted
on punching tools in a particularly simple and precise
manner.
Within the scope of this aim, a consequent primary
object is to provide an accessory/fixture the assembly
whereof does not require particular provisions.
Another important object is to provide an improved
accessory/fixture that can be manufactured with simple
mechanical machining processes.
Another object is to provide an improved
accessory/fixture that maintains a low cost and can be mass-produced.
This aim, these objects, and others which will become
apparent hereinafter are achieved by an improved
accessory/fixture for punching tools, of the type comprising
an elongated metallic body with at least one end that tapers
and forms a sharp cutting edge or a point, said
accessory/fixture being characterized in that said body has
a knurled annular portion on its outer surface.
Further characteristics and advantages of the invention
will become apparent from the following detailed description
of an embodiment thereof, illustrated only by way of non-limitative
example in the accompanying drawings, wherein:
With reference to the above mentioned figures 1 to 3, a
punching tool is generally designated by the reference
numeral 10 and is constituted by a shaped metallic band 11
the profile whereof forms a figure that is closed but can,
in some instances, be open as well.
The band 11 is arranged edgeways and therefore has, in
this case, two sharp cutting edges, designated by the
reference numerals 12 and 13 respectively.
A single sharp edge may be provided in alternative
embodiments.
A cantilevered laminar element 14 is welded internally
to said band 11 in a central region and forms the support
for a plurality of perforators 15 or, as an alternative, for
needles, which will be described better hereinafter and are
adapted to obtain a corresponding plurality of holes around
the cutting edge.
Each perforator 15 is constituted, in the case being
considered, by a cylindrical elongated metallic body 16 with
two tapered ends, respectively 17 and 18, that are hollow so
as to form a sharp cutting edge, designated by the reference
numerals 19 and 20 respectively.
Of course, the length of each perforator 15 is equal to
the distance between the two edges 12 and 13 of the punching
tool 10 which, in the case being considered, are both sharp,
as mentioned earlier.
An opening for discharging the cutting scrap,
designated by the reference numerals 21 and 22 respectively,
is present close to each end 17 and 18, and is connected to
its interior.
Said openings 21 and 22 are conveniently shaped so as
to guide the discharge of the scrap.
According to the invention, the body 16 has, in a
central region on the outer surface, a knurled annular
portion 23 constituted in practice by a plurality of
longitudinal parallel raised portions that increase its
diametrical bulk by approximately one tenth with respect to
the nominal value.
As shown in figure 3, the knurled portion 23 entirely
affects the coupling region, by insertion in an adapted hole
24 the diameter whereof is equal to the nominal diameter of
the perforator 15 that is present on the laminar element 14.
The insertion of the perforator 15 in the hole 24
occurs first manually, by positioning one of the tapered
ends 17 and 18 in said hole 24, and then by means of a
press, until the knurled portion 23 assumes the correct
position.
The longitudinal raised portions of the knurling 23 act
as guides for the exact mutual positioning of the coupled
parts, and their larger diametrical bulk with respect to
that of the hole 24 produces a pressure between the parts
that is sufficient to achieve a considerable locking force.
The knurling operation is conveniently performed after
the machining of the perforator on the machine tool and
before said perforator is tempered and optionally
electroplated with nickel or chromium.
With reference now to figure 4, each needle 115 is
constituted by a cylindrical elongated metal body 116 with
two tapered and pointed ends, respectively 117 and 118.
The body 116 has, in a central region, on the outer
surface, a knurled annular portion 123 constituted in
practice by a plurality of longitudinal parallel raised
portions that increase its diametrical bulk by approximately
one tenth with respect to the nominal value.
The execution of the knurling and the insertion in the
holes of the punching tool are equivalent to what has been
already mentioned for the perforators 15.
In practice it has been observed that the intended aim
and objects of the present invention have been achieved.
The execution of the knurling on the outer surface of
the perforator 15 or of the needle 115 in fact allows to
provide punching tools that are qualitatively better than
current ones as regards the exact positioning of the
perforators and therefore cutting combined with perforation
and as regards the exact positioning of the references
formed with the needles.
Another important advantage is constituted by easy
insertion in the holes of the supports of the punching tool.
The invention thus conceived is susceptible of numerous
modifications and variations, all of which are within the
scope of the inventive concept.
All the details may furthermore be replaced with other
technically equivalent elements.
In practice, the materials employed, so long as they
are compatible with the contingent use, as well as the
dimensions, may be any according to the requirements.
Where technical features mentioned in any claim are
followed by reference signs, those reference signs have been
included for the sole purpose of increasing the
intelligibility of the claims and accordingly, such
reference signs do not have any limiting effect on the
interpretation of each element identified by way of example
by such reference signs.
Claims (8)
- An improved accessory/fixture for punching tools, of the type comprising an elongated metallic body with at least one end that tapers and forms a sharp cutting edge or a point, said accessory/fixture being characterized in that said body has a knurled annular portion on its outer surface.
- An improved accessory/fixture for punching tools according to claim 1, characterized in that it comprises an elongated metal body with at least one hollow and tapered end that forms a sharp cutting edge, an opening for the discharge of the cutting scrap being provided on said body proximate to said end and being connected to its inside, a knurled annular portion being provided on the outer surface.
- An accessory/fixture according to claim 1, characterized in that said knurled annular portion is constituted by a plurality of longitudinal raised portions.
- An accessory/fixture according to claim 1, characterized in that said knurled portion completely affects the region for coupling, by insertion in an adapted hole, to a laminar support that is coupled to a punching tool.
- An accessory/fixture according to claim 1, characterized in that said knurled portion is preferably in a median region of said body where both of its ends are sharp.
- An accessory/fixture according to claim 1, characterized in that said body has a circular cross-section.
- An accessory/fixture according to claim 4, characterized in that its nominal diameter is equal to the diameter of said hole wherein it is inserted.
- An accessory/fixture according to claim 1, characterized in that said knurled portion has a diametrical bulk that is approximately one tenth of a millimeter greater than its nominal diameter.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP97112122A EP0891844A1 (en) | 1997-07-16 | 1997-07-16 | Anchoring means for punching tools |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP97112122A EP0891844A1 (en) | 1997-07-16 | 1997-07-16 | Anchoring means for punching tools |
Publications (1)
Publication Number | Publication Date |
---|---|
EP0891844A1 true EP0891844A1 (en) | 1999-01-20 |
Family
ID=8227066
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP97112122A Withdrawn EP0891844A1 (en) | 1997-07-16 | 1997-07-16 | Anchoring means for punching tools |
Country Status (1)
Country | Link |
---|---|
EP (1) | EP0891844A1 (en) |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE42995C (en) * | Firma LAPP & KlNK in München | Method of making the cut for cardboard boxes | ||
US2556148A (en) * | 1945-10-05 | 1951-06-05 | Arthur E Petzon | Method of casting die sets |
FR1327708A (en) * | 1956-08-03 | 1963-05-24 | Process for manufacturing cookie cutters, intended for cutting leather for shoes, various skins, cardboard and paper, and cookie cutters obtained from this process | |
CH396695A (en) * | 1961-09-04 | 1965-07-31 | Chrobok Hoffmann Kg Stanzmesse | Method for producing a punching knife with a core piece serving as a holder for the punching blade forming the outer edge of the punching knife and a punching knife manufactured according to the method |
US4002092A (en) * | 1975-06-11 | 1977-01-11 | B & M Die Co., Inc. | Compound angle cutting edge and method of using same |
GB2115735A (en) * | 1982-03-04 | 1983-09-14 | Pa Management Consult | Press knife |
-
1997
- 1997-07-16 EP EP97112122A patent/EP0891844A1/en not_active Withdrawn
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE42995C (en) * | Firma LAPP & KlNK in München | Method of making the cut for cardboard boxes | ||
US2556148A (en) * | 1945-10-05 | 1951-06-05 | Arthur E Petzon | Method of casting die sets |
FR1327708A (en) * | 1956-08-03 | 1963-05-24 | Process for manufacturing cookie cutters, intended for cutting leather for shoes, various skins, cardboard and paper, and cookie cutters obtained from this process | |
CH396695A (en) * | 1961-09-04 | 1965-07-31 | Chrobok Hoffmann Kg Stanzmesse | Method for producing a punching knife with a core piece serving as a holder for the punching blade forming the outer edge of the punching knife and a punching knife manufactured according to the method |
US4002092A (en) * | 1975-06-11 | 1977-01-11 | B & M Die Co., Inc. | Compound angle cutting edge and method of using same |
GB2115735A (en) * | 1982-03-04 | 1983-09-14 | Pa Management Consult | Press knife |
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