US3872744A - Self-emptying punching tool - Google Patents

Self-emptying punching tool Download PDF

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Publication number
US3872744A
US3872744A US282324A US28232472A US3872744A US 3872744 A US3872744 A US 3872744A US 282324 A US282324 A US 282324A US 28232472 A US28232472 A US 28232472A US 3872744 A US3872744 A US 3872744A
Authority
US
United States
Prior art keywords
strip
wall
knife edge
endless
curvatures
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.)
Expired - Lifetime
Application number
US282324A
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English (en)
Inventor
Emil Fauth
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
EMIL FAUTH Firma
Original Assignee
EMIL FAUTH Firma
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by EMIL FAUTH Firma filed Critical EMIL FAUTH Firma
Application granted granted Critical
Publication of US3872744A publication Critical patent/US3872744A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C14—SKINS; HIDES; PELTS; LEATHER
    • C14B—MECHANICAL TREATMENT OR PROCESSING OF SKINS, HIDES OR LEATHER IN GENERAL; PELT-SHEARING MACHINES; INTESTINE-SPLITTING MACHINES
    • C14B5/00—Clicking, perforating, or cutting leather
    • C14B5/02—Stamps or dies for leather articles
    • A—HUMAN NECESSITIES
    • A43—FOOTWEAR
    • A43D—MACHINES, TOOLS, EQUIPMENT OR METHODS FOR MANUFACTURING OR REPAIRING FOOTWEAR
    • A43D8/00—Machines for cutting, ornamenting, marking or otherwise working up shoe part blanks
    • A43D8/006—Machines for cutting, ornamenting, marking or otherwise working up shoe part blanks for forming shoe stiffeners
    • A—HUMAN NECESSITIES
    • A43—FOOTWEAR
    • A43D—MACHINES, TOOLS, EQUIPMENT OR METHODS FOR MANUFACTURING OR REPAIRING FOOTWEAR
    • A43D8/00—Machines for cutting, ornamenting, marking or otherwise working up shoe part blanks
    • A43D8/02—Cutting-out
    • A43D8/04—Stamping-out
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/929—Tool or tool with support
    • Y10T83/9295—Work supported tool [e.g., clicker die]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/929—Tool or tool with support
    • Y10T83/9411—Cutting couple type
    • Y10T83/9423—Punching tool
    • Y10T83/9428—Shear-type male tool

Definitions

  • ABSTRACT A self-discharging punching tool for use in the leather Foreign pp ri ri y Data and textile industry is disclosed.
  • the tool comprises a Aug. 24. 1971 Germany....L 2142234 body portion with an endless cutting knife, the cutting 1 knife being conically tapered relative to the perpen- [52] US. Cl 76/107 C, 83/652, 83/686 dicular and being made from prehardened, finish- [51] Int. Cl C22b 3/02 ground strip steel.
  • the invention is directed to self-emptying or selfdischarging punching or cutting tools, particularly useful for use in the shoe industry for clicking shoe parts and the like.
  • the invention is also directed to a method for manufacturing the novel punching tool.
  • punching tools In the manufacture of shoes, the soles, the counters, the uppers and other shoe parts are clicked or punched from the blanks by means of punching or cutting tools (hereinafter referred to as punching tools).
  • punching tools The general custom is to use for this purpose forged punching forms or patterns which, on the average have a weight of about 1.5 kg. Generally, about 600 punchings or clickings per hour can be carried out with such prior art punching forms.
  • the form In both instances, to wit, whether forged punching forms or punching forms made from unhardened strip steel are used, the form must first be subjected to an annealing treatment for stress relief purposes, whereafter the form is hardened and tempered. Finally, the back or rear portion of the form has to be surface ground and the cutting edge has to be ground at the inner side relative to the circumferential surface of the form.
  • Another object of the invention is to propose a method for manufacturing the punching forms of the invention which is simple to carry out with a minimum of equipment and expenditure.
  • the invention is based on the realization that thermal treatment and grinding treatment which hitherto had to be performed on the punching form, can be successfully avoided by using hardened and ground strip steel having a cutting edge and to process suchstrip steel into a self-discharging form of the desired pattern.
  • strip steel having a cutting edge which has been prehardened can be successfully cold-drawn or stretched in mechanical manner in the region of its back or cutting portions. It has thus been established that, after such strip steel has been bent into the desired punching pattern or shape, the tapering or slanting of the strip steel'which is necessary for self-emptying or discharge, can successfully be accomplished by correin cold condition.
  • the invention provides a selfdischarging punching tool for the leather and textile industry, particularly for the shoe industry which is characterized in that it has a cutting knife bent into an endless shape of the desired pattern, said cutting knife being conically tapered and being made from a prehardened pre-finish-ground strip steel.
  • the tapering extends in an upward direction.
  • the cutting edge of the knife or punching tool is hollow-edged ground while the inclination or tapering of the knife amounts to about 4.5 relative to the perpendicular.
  • hardened and finish-ground strip steel having a knife edge and while being bent into the desired punching tool pattern is drawn or stretched in mechanical manner and in cold condition to form the desired pattern.
  • the drawing or stretching is effected at the side of the cutting edge while for the formation of outwardly pointing curvatures the drawing or stretching is effected at the side of the back.
  • a circumferential reinforcement in the nature of a frame member or the like may be connected to the outer side of the back or rear edge or the rear side, for example, by means of welding.
  • the self-discharging punching forms of this invention are significantly lighter in weight than prior art forms. Further, they are much simpler to produce since, as compared to the prior art forms made from forged steel or the like, the working steps of forging, surface grinding, filing, grinding of the knife edge, sharpening, hardening as well as tempering and polishing are eliminated.
  • the inventive punching form is lighter in weight than the prior art constructions.
  • the new forms can successfully be manufactured at a weight of about 1.0 kg as compared to forged steel forms which have a weight of 1.5 kg. Accordingly, .the new forms are significantly lighter, to wit, by an amount of about 0.5 kg. This means that if about 600 clickings or punchings are carried out per hour, the savings in weight per hour are about 300 kg.
  • the inventive punching tools or knives may be produced in any desired shape, pattern and height, with or without reinforcing frame or the like strengthening means.
  • the novel tools may be used in all branches of the textile and leather industry.
  • FIG. 2 is a cross-sectional view through the tool of FIG. 1 along line A B, showing the outer tapering or inclination of the wall-forming portion of the tool.
  • the tool comprises a body portion of knife wall 1 which is made from strip steel which has previously been hardened and which has been finish-ground to form the knife edge 4. It will be noted that the knife wall 1 tapers or is inclined, the tapering or inclination being about 4.5 in an upward and outward direction.
  • the knife wall 1 is reinforced by a frame member 2.
  • the frame member 2 is rigidly connected with the knife member 1 by means of welding as indicated by reference numeral 3.
  • the cutting edge 4 is thus endless and forms the desired pattern to be cut.
  • the inwardly curved portions of the cutting edge 4 are formed by stretching or drawing the strip steel at the cutting edge side while the outwardly directed curved portions are formed by drawing or stretching on the side of the back or rear.
  • the mechanical working for forming the curvatures is accomplished while the steel is in cold condition.
  • the stretching or drawing of the strip steel is best effected in a device which has a hammer-like tool.
  • the peen of the hammer extends transversely to the longitudinal direction of the steel strip.
  • the hammer is struck .or pressed against the anvil of the device with the steel strip interposed. In this manner the thickness of the steel strip is locally reduced and the strip is thus stretched or drawn.
  • the hammer action is sufficiently strong, notches or indentations are formed in the surface of the steel. The greater the number of notches, the larger is the stretching of the strip.
  • the notches or hammer impact areas are not formed over the entire width of the strip but are applied selectively to obtain the desired shaping result.
  • the notches are formed near the cutting edge while, by contrast, the notches or hammer impact areas are adjacent the back or rear edge of the form if convex curving is desired. If, for example, the rear or back of a rectangular form is stretched or drawn in the indicated manner by hammer action in the vicinity of the corners of the rectangle, then a conical punching tool or form is obtained which is wider at its rear or back than at the cutting edge.
  • a self-emptying punching tool for clicking shoe parts or cutting textile fabrics including a body portion consisting of an elongated strip formed in an endless configuration extending longitudinally completely about an area enclosed by said strip, said strip including an inner wall facing toward said enclosed area, and an endless cutting edge extending longitudinally along said strip on one side of said inner wall, the improvement wherein said strip consists essentially of a single continuous strip of prehardened, finish-ground steel having two.
  • said strip being essentially composed of cold-formed material stretched longitudinally in a progressively increasing manner commencing from said knife edge, said knife edge consisting essentially of unstretched material which has been retained in its original circumferential length.
  • a method for producing a self-emptying punching tool comprising the steps of forming a prehardened and finish-ground elongated strip of steel having a knife edge on one side thereof into a continuous endless configuration which completely encloses an area about which said formed strip is shaped to circumferentially extend, and mechanically cold forming said endless strip to effect longitudinal stretching of said strip in a progressively increasing manner commencing from said knife edge while maintaining said knife edge in its original circumferential length, said cold-forming being effected while said strip is in said prehardened and finish-ground condition to form said strip into a configuration with the inner wall of said endless strip tapering from said knife edge outwardly relative to said enclosed area such that said enclosed area increases progressively from the side of said inner wall at which said knife edge is formed to the side of said inner wall opposite said knife edge.
  • tapered wall extends at an angle of about 4.5 relative to a line extending perpendicularly to said enclosed area.
  • said end less configuration includes inwardly and outwardly pointing curvatures, said inwardly pointing curvatures being formed by mechanically stretching said steel strip at the side of said knife edge while said outwardly pointing curvatures are formed on the back side of said strip steel, said mechanical stretching being effected while said strip is in the cold condition.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Footwear And Its Accessory, Manufacturing Method And Apparatuses (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
  • Punching Or Piercing (AREA)
  • Forging (AREA)
  • Sawing (AREA)
US282324A 1971-08-24 1972-08-21 Self-emptying punching tool Expired - Lifetime US3872744A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2142234A DE2142234A1 (de) 1971-08-24 1971-08-24 Stanzwerkzeug

Publications (1)

Publication Number Publication Date
US3872744A true US3872744A (en) 1975-03-25

Family

ID=5817553

Family Applications (1)

Application Number Title Priority Date Filing Date
US282324A Expired - Lifetime US3872744A (en) 1971-08-24 1972-08-21 Self-emptying punching tool

Country Status (17)

Country Link
US (1) US3872744A (de)
JP (2) JPS5649562B2 (de)
AT (1) AT333158B (de)
BE (1) BE787261A (de)
CA (1) CA991537A (de)
CS (1) CS200164B2 (de)
DD (1) DD99089A5 (de)
DE (1) DE2142234A1 (de)
ES (2) ES406055A1 (de)
FR (1) FR2151288A5 (de)
GB (1) GB1369361A (de)
HU (1) HU171111B (de)
IT (1) IT968307B (de)
NL (1) NL7211546A (de)
PL (1) PL77394B1 (de)
SE (1) SE385021B (de)
ZA (1) ZA725670B (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4625592A (en) * 1985-02-06 1986-12-02 Bayens Harold J Die for cutting paper, cloth and the like and method of making same
US5566594A (en) * 1993-11-05 1996-10-22 Michlin; Steven B. Long life re-rulable steel rule die system
US20030159560A1 (en) * 2000-05-15 2003-08-28 Georg Drescher Device for punching plastic materials
US20130014621A1 (en) * 2011-07-15 2013-01-17 Corcoran Kevin L Chemical-etched die having improved registration means
CN114571186A (zh) * 2022-01-25 2022-06-03 华亿轴承科技（江苏）有限公司 一种无油轴承的加工工艺

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2740981B2 (de) * 1977-09-12 1980-08-07 Vereinigte Edelstahlwerke Ag (Vew), Wien Niederlassung Vereinigte Edelstahlwerke Ag (Vew) Verkaufsniederlassung Buederich, 4005 Meerbusch Stanzmesser
DK149424C (da) * 1981-07-10 1986-11-17 Bording Grafik As Stanseapparat til udstansning af emner med kurvede eller buede kanter fra arkformet materiale, navnlig etiketter og lignende tryksagsemner
WO1987004259A1 (en) * 1986-01-13 1987-07-16 Data Instruments Inc. Intrusion detection system for operating industrial machines
CN109355447A (zh) * 2018-09-18 2019-02-19 嘉兴学院 一种办公椅皮的自动裁剪装置

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US954559A (en) * 1909-04-15 1910-04-12 Harry Zimmerman Material-cutter and grouping-frame.
US1129079A (en) * 1913-05-07 1915-02-23 United Shoe Machinery Ab Die.
US2178473A (en) * 1939-03-09 1939-10-31 Endicott Johnson Corp Sharp edge cutting die
US2211213A (en) * 1938-11-19 1940-08-13 Independent Die And Supply Com Die stock and die made therefrom
US3152492A (en) * 1962-01-03 1964-10-13 Graydon E Whitecotton Method of making steel-rule type piercing and blanking dies
US3205732A (en) * 1963-12-09 1965-09-14 Cellu Craft Products Corp Rotary cutting die
US3381563A (en) * 1965-01-27 1968-05-07 Deritend Eng Co Apparatus for treating board

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US954559A (en) * 1909-04-15 1910-04-12 Harry Zimmerman Material-cutter and grouping-frame.
US1129079A (en) * 1913-05-07 1915-02-23 United Shoe Machinery Ab Die.
US2211213A (en) * 1938-11-19 1940-08-13 Independent Die And Supply Com Die stock and die made therefrom
US2178473A (en) * 1939-03-09 1939-10-31 Endicott Johnson Corp Sharp edge cutting die
US3152492A (en) * 1962-01-03 1964-10-13 Graydon E Whitecotton Method of making steel-rule type piercing and blanking dies
US3205732A (en) * 1963-12-09 1965-09-14 Cellu Craft Products Corp Rotary cutting die
US3381563A (en) * 1965-01-27 1968-05-07 Deritend Eng Co Apparatus for treating board

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4625592A (en) * 1985-02-06 1986-12-02 Bayens Harold J Die for cutting paper, cloth and the like and method of making same
US5566594A (en) * 1993-11-05 1996-10-22 Michlin; Steven B. Long life re-rulable steel rule die system
US20030159560A1 (en) * 2000-05-15 2003-08-28 Georg Drescher Device for punching plastic materials
US20130014621A1 (en) * 2011-07-15 2013-01-17 Corcoran Kevin L Chemical-etched die having improved registration means
US9079325B2 (en) * 2011-07-15 2015-07-14 Ellison Educational Equipment, Inc. Chemical-etched die having improved registration means
CN114571186A (zh) * 2022-01-25 2022-06-03 华亿轴承科技（江苏）有限公司 一种无油轴承的加工工艺

Also Published As

Publication number Publication date
ATA569772A (de) 1976-02-15
DE2142234A1 (de) 1973-03-22
CS200164B2 (en) 1980-08-29
JPS5649562B2 (de) 1981-11-24
CA991537A (en) 1976-06-22
SE385021B (sv) 1976-05-31
ES188382U (es) 1974-02-01
JPS5818200B2 (ja) 1983-04-12
JPS5511702A (en) 1980-01-26
HU171111B (hu) 1977-11-28
IT968307B (it) 1974-03-20
FR2151288A5 (de) 1973-04-13
DD99089A5 (de) 1973-07-20
BE787261A (fr) 1972-12-01
AT333158B (de) 1976-11-10
NL7211546A (de) 1973-02-27
JPS4835940A (de) 1973-05-26
GB1369361A (en) 1974-10-09
ES406055A1 (es) 1975-08-16
ES188382Y (es) 1974-09-16
ZA725670B (en) 1973-05-30
PL77394B1 (de) 1975-04-30

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