US3775796A - Machine for pre-shaping shoe parts - Google Patents

Machine for pre-shaping shoe parts Download PDF

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Publication number
US3775796A
US3775796A US00286585A US3775796DA US3775796A US 3775796 A US3775796 A US 3775796A US 00286585 A US00286585 A US 00286585A US 3775796D A US3775796D A US 3775796DA US 3775796 A US3775796 A US 3775796A
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combination
conductive
band
form means
bands
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US00286585A
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English (en)
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H Schindler
G Winter
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Individual
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Individual
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    • A—HUMAN NECESSITIES
    • A43—FOOTWEAR
    • A43D—MACHINES, TOOLS, EQUIPMENT OR METHODS FOR MANUFACTURING OR REPAIRING FOOTWEAR
    • A43D11/00—Machines for preliminary treatment or assembling of upper-parts, counters, or insoles on their lasts preparatory to the pulling-over or lasting operations; Applying or removing protective coverings
    • A43D11/12—Machines for forming the toe part or heel part of shoes, with or without use of heat
    • A—HUMAN NECESSITIES
    • A43—FOOTWEAR
    • A43D—MACHINES, TOOLS, EQUIPMENT OR METHODS FOR MANUFACTURING OR REPAIRING FOOTWEAR
    • A43D25/00—Devices for gluing shoe parts
    • A43D25/06—Devices for gluing soles on shoe bottoms

Definitions

  • ABSTRACT Two electrically non-conductive bands are movably mounted on a machine for pre-shaping shoe parts. Electrically conductive layers are provided between the two bands the bands and the layers both being PATENTEU DEC 4 1975 SREE" 2 0F 2 1 MACHINE FOR IRE-SHAIING SHOE PARTS BACKGROUND OF THE INVENTION
  • This invention relates to a machine for heating and pre-shaping a thermoplastic stiffening or counter in the heel portion of a shoe upper with the aid of highfrequency means.
  • thermoplastic materials are known in the art for the fabrication of toe-caps and the like. These materials make possible the use of high-frequency techniques which soften such thermoplastic components of the shoe upper prior to their initial shaping. Such a technique offers an important advantage in that the heat applied does not have to be conducted through the upper leather to reach the toe-cap or stiffening; instead, the heat is produced in the thermoplastic member itself by dielectric heating.
  • a further difficulty relates to the problem of finding the proper distance between the electrical conductor and the thermoplastic member to be softened for preshaping.
  • Another object of the present invention is to provide such an improvement which is simple in construction and economical to manufacture.
  • It is a further object ot provide an improvement of the type under discussion which does not require one of the conductive elements to be exactly configurated to a predetermined shape as was the case in previous machines.
  • the present invention for a combination for shaping frequency heat deformable materials, comprises a rigid form means for deforming the heat deformable material into a predetermined shape when the material is press-fitted in a heated and softened state against said form means.
  • Said form means has at least one portion which is made from electrically conductive material.
  • Flexible band means are provided which is displaceable with respect to said form means.
  • Said flexible band means comprises at least one elongated band of electrically non-conductive material, and a conductive metal layer extending along said elongated band. Both said layer and said band are so configurated so as to be flexible.
  • Connecting means are provided for connecting a source of high frequency electrical energy to said conductive portion and to said conductive metal layer when said flexible band means has moved to a position to press-fit the deformable material against said form means.
  • the structure of said band means, including said conductive layer, based on the invention has yielded very good results in actual operation. It ensures uniform heating of the entire stiffening member.
  • the advantage of the structure based on the invention has been achieved by providing at least one conductive layer between two layers or bands of Teflon.
  • the flexible band or strip can comprise a plurality of layers of different materials of which at least one material is electrically conductive.
  • the strip or band built up from these layers is shaped approximately to conform to the outline of the heel portion of a last.
  • the electrically-conductive layer can be I provided in the form of a foil or simply evaporated onto one or both Teflon layers. Instead of Teflon, use can be made, of course, of any other suitable dielectric material.
  • Another advantageous structure has the conductive foil in the form of individual strips arranged transversely on the upper band of the dielectric material and longitudinally on the lower band, or vice versa. Adjacent strips arranged to slightly overlap ensure satisfactory resilience of the entire structure and offer no resistance to deformation.
  • sparking is readily produced at the edges of the conductive band with the result that both the metal insert structure and the plastic band itself is destroyed.
  • sparking is prevented by applying a thin film of non-conductive. material in a strip-like configuration along the edges of the metal foil.
  • FIG. 1 is a front elevational view of the machine in accordance with the present invention.
  • FIG. 2 is a section along line I I of FIG. 1;
  • FIG. 3 is a section along line II II of FIG. 2, showing a top view on the clamping jaw arrangement
  • FIG. 4 is a cross-section through the heel band
  • FIG. 5 is a top view of the inner side of the two outer portions of the band.
  • An upright frame member 1 carries a cylinder 2 whose piston rod 3 supports a base-plate 4.
  • a baseplate 4 carries side-plates 6 which are journalled therein at support points 5.
  • An elongated flexible band in the form of a heel-band 7 is accommodated at the lower ends 6' of side-plate 6.
  • Heel-band 7 includes Teflon bands 7' and 7
  • Two additional layers 8 and 8 of an electrically-conductive material are disposed between bands 7' and 7".
  • only one conductive layer may be provided.
  • the electrically-conductive layers are preferably composed of a plurality of overlapping metallic strips in a configuration resembling fish-scales.
  • bands 7 and 7" can be rigidly connected to layers 8 and 8.
  • edges of the metal layer or layers carry strips 23 of a non-conductive material bonded thereto.
  • heel-band 7 and side-plates 6 can remain free.
  • the space can be filled with a resilient material 9. This increases the biasing force exerted by heel-band 7 when the latter is lowered.
  • the entire moveable unit executes a rectilinear movement, being guided by a rod 10 which moves in a keyway 11.
  • the upper leather (not shown) is stretched over a heel last member 12.
  • the heel last member 12 preferably matches the original last as closely as possible.
  • - heel last member 12 is anchored to the upright frame member 1 by means of an isolating support element 13.
  • the highfrequency current is supplied via metal strip conductors (not shown) the electrical circuit being conventional.
  • Holding and stretching means for the vamp portion of the upper leather is accommodated below the heel last member 12.
  • Two gripping jaws 16 (FIG. 3) are urged against a block 19 by means of levers 17 accommodated between gripping jaws 16 and block 19.
  • the gripping jaw arrangement can be guided upwards and downwards along guide means 20 with the aid of an actuation cylinder 21 in order to bring the shoe upper into firm abutment against the heel last member 12 with its heel portion.
  • the movement of all cylinders or their pistons is governed by conventional valves known in the art (not shown). Suitable electrical circuitry, of any conventional type, cooperates with the valve system.
  • Heel last member 12 and heel band 7 are connected to a high-frequency generator in an opposite polar arrangement, so that a high-frequency field is formed between the metal layer 8 (8') of the heel band 7 and the metal heel last member 12.
  • the high-frequency field generates heat which causes the softening of the thermoplastic material of the stiffening or counter.
  • the upper leather with the counter inserted, is stretched manually with its heel portion over heel last member 12.
  • the vamp portion of the upper leather is inserted between gripping jaws 16 and block 19; and a foot-operated switch (not shown) is actuated.
  • gripping jaws l6, driven by cylinder 18, close, whereupon the entire gripping jaw arrangement, driven by cylinder 21, moves downward.
  • the upper leather is pulled over heel last member 12 so that the heel portion thereof is tightly stretched thereover.
  • Cylinder 2 then moves the entire heel-band device downward towards heel last member 12 and firmly urges the heel portion of the upper leather against heel last member 12. Shortly before the end of this movement, cam 14 trips switch '15 which governs the flow of the high-frequency current.
  • the high-frequency heat- 4 ing cycle is preferably controlled automatically, whereupon heel-band 7 and gripping jaws 16 return to their respective initial positions at the end of the cycle.
  • a combination comprising rigid form means for deforming the heat deformable material into a predetermined shape when the material is press-fitted in a heated and softened state against said form means, said form means having at least a portion made from an electrically conductive material; flexible band means being displaceable with respect to said form means, said flexible band means comprising at least one elongated band of electrically non-conductive material, and a conductive metal layer extending along said elongated band, both said layer and said band being so configurated so as to be flexible, said conductive metal layer including a plurality of adjacent individual metallic strips; and connecting means for connecting a source of high frequency electrical energy to said conductive portion and to said conductive metal layer when said flexible band means has moved to a position to press'fit the deformable material against said form means.
  • each of said metallic strips is individually connected to said elongated band.
  • said conductive metal layer defines at least one edge, and further comprising non-conductive means positioned across said edge for retarding sparking once the source of electrical energy is connected.
  • said non-conductive means comprises a strip of a nonconductive material of a relatively narrow width compared to that of said conductive metal layer.
  • a combination as defined inclaim 1 further including stretching means for stretching said deformable material located intermediate said rigid form means and said flexible band means, whereby stretching of the flexible band means press-fits the heat deformable material against said rigid form means.
  • said deformable material comprises the upper leather of a shoe
  • said stretching means comprises a gripping jaw arrangement displaceable relative to said rigid form means; and activating means for displacing said jaw arrangement with respect to said rigid form.
  • a combination com prising rigid form means for deforming the heat deformable material into a predetermined shape when the material is press-fitted in a heated and softened state against said form means, said form means having at least a portion made from an electrically conductive material; flexible band means being displaceable with respect to said form means, said flexible band means comprising two elongated bands of electrically nonconductive material with each having an inner surface facing the other band, and two conductive metal layers with each extending along another one of said inner surfaces of said elongated bands, both said layers and said bands being so configurated so as to be flexible;
  • connecting means for connecting a source of high frequency electrical energy to said conductive-portion and to said conductive metal layers when said flexible band means has moved to a position to press-fit the deformable material against said form means.
  • each metal layer comprises a plurality of adjacent individual metallic strips arranged so that adjacent strips slightly overlap each other, the metallic strips of one layer being angularly displaced by an angle of up to relative to the metallic strips of the other layer.

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  • Footwear And Its Accessory, Manufacturing Method And Apparatuses (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
US00286585A 1971-09-08 1972-09-05 Machine for pre-shaping shoe parts Expired - Lifetime US3775796A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2144904A DE2144904A1 (de) 1971-09-08 1971-09-08 Maschine zum vorformen eines schuhteiles

Publications (1)

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US3775796A true US3775796A (en) 1973-12-04

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US00286585A Expired - Lifetime US3775796A (en) 1971-09-08 1972-09-05 Machine for pre-shaping shoe parts

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US (1) US3775796A (ref)
DE (1) DE2144904A1 (ref)
FR (1) FR2152160A5 (ref)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4249279A (en) * 1978-10-18 1981-02-10 Usm Corporation Shoe backpart molding machine
US4338696A (en) * 1979-08-03 1982-07-13 Societe Immobiliere Et Financiere Suchet-Alfort (S.I.F.S.A.) Apparatus for shaping counters in making shoes

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104799491A (zh) * 2014-10-25 2015-07-29 东莞市良强机械有限公司 真空压底制鞋装置结构

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2983934A (en) * 1958-08-05 1961-05-16 Bertrand Eugene Alphon Gabriel Shoemaking appliance for shaping the backs of shoe uppers
US3039288A (en) * 1961-08-09 1962-06-19 Geo Knight & Co Inc Back seam press
US3105250A (en) * 1961-04-05 1963-10-01 Kamborian Shoe stiffener heating apparatus
US3545023A (en) * 1968-11-12 1970-12-08 George W Foss Shoe manufacturing

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2983934A (en) * 1958-08-05 1961-05-16 Bertrand Eugene Alphon Gabriel Shoemaking appliance for shaping the backs of shoe uppers
US3105250A (en) * 1961-04-05 1963-10-01 Kamborian Shoe stiffener heating apparatus
US3039288A (en) * 1961-08-09 1962-06-19 Geo Knight & Co Inc Back seam press
US3545023A (en) * 1968-11-12 1970-12-08 George W Foss Shoe manufacturing

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4249279A (en) * 1978-10-18 1981-02-10 Usm Corporation Shoe backpart molding machine
US4338696A (en) * 1979-08-03 1982-07-13 Societe Immobiliere Et Financiere Suchet-Alfort (S.I.F.S.A.) Apparatus for shaping counters in making shoes

Also Published As

Publication number Publication date
FR2152160A5 (ref) 1973-04-20
DE2144904A1 (de) 1973-03-15

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