EP0707079A1 - Dispositif pour parer les bords de pièces de cuir - Google Patents

Dispositif pour parer les bords de pièces de cuir Download PDF

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Publication number
EP0707079A1
EP0707079A1 EP95115592A EP95115592A EP0707079A1 EP 0707079 A1 EP0707079 A1 EP 0707079A1 EP 95115592 A EP95115592 A EP 95115592A EP 95115592 A EP95115592 A EP 95115592A EP 0707079 A1 EP0707079 A1 EP 0707079A1
Authority
EP
European Patent Office
Prior art keywords
feature
knife
guide foot
measuring
band knife
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Withdrawn
Application number
EP95115592A
Other languages
German (de)
English (en)
Inventor
Hermann Herz
Dieter Braun
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.)
LEIBROCK MASCHINENFABRIK GmbH
Original Assignee
LEIBROCK MASCHINENFABRIK GmbH
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
Priority claimed from DE9416329U external-priority patent/DE9416329U1/de
Application filed by LEIBROCK MASCHINENFABRIK GmbH filed Critical LEIBROCK MASCHINENFABRIK GmbH
Publication of EP0707079A1 publication Critical patent/EP0707079A1/fr
Withdrawn legal-status Critical Current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
    • C14B1/00—Manufacture of leather; Machines or devices therefor
    • C14B1/02—Fleshing, unhairing, samming, stretching-out, setting-out, shaving, splitting, or skiving skins, hides, or leather
    • C14B1/14—Fleshing, unhairing, samming, stretching-out, setting-out, shaving, splitting, or skiving skins, hides, or leather using tools cutting the skin in a plane substantially parallel to its surface
    • C14B1/22—Fleshing, unhairing, samming, stretching-out, setting-out, shaving, splitting, or skiving skins, hides, or leather using tools cutting the skin in a plane substantially parallel to its surface using cylindrical knives
    • 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
    • A43D8/32—Working on edges or margins
    • A43D8/34—Working on edges or margins by skiving
    • 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
    • C14B1/00—Manufacture of leather; Machines or devices therefor
    • C14B1/02—Fleshing, unhairing, samming, stretching-out, setting-out, shaving, splitting, or skiving skins, hides, or leather
    • C14B1/14—Fleshing, unhairing, samming, stretching-out, setting-out, shaving, splitting, or skiving skins, hides, or leather using tools cutting the skin in a plane substantially parallel to its surface
    • C14B1/18—Fleshing, unhairing, samming, stretching-out, setting-out, shaving, splitting, or skiving skins, hides, or leather using tools cutting the skin in a plane substantially parallel to its surface using band knives

Definitions

  • the invention relates to devices for sharpening the edges of leather blanks, in particular shaft parts in shoe manufacture, according to the preamble of claim 1.
  • Sharpening is one of the most important tasks that have to be done when preparing leather cuts, for example in the shoe industry or in the manufacture of small leather goods. This means thinning the edges. This dilution and equalization takes place for various reasons. The correct execution of the various sharpenings has a major influence on the subsequent work in the quilting. It is also important for the durability of the seams, the appearance of the finished workpiece and its load-bearing capacity.
  • the bell knife sharpening machines which have been known for around 90 years, are used, which have been developed over the years to achieve technical maturity and great performance.
  • the three essential parts of these sharpening machines are the bell knife, the feed roller and the guide foot.
  • the feed roller is barrel-shaped, its circumference corresponds exactly to the radius of the knife edge of the bell knife.
  • the shape and position of the leading edge on the guide foot determine the shape of the cutting edge.
  • the different sharpenings are achieved by adjusting the guide foot in height and angle.
  • the bell knives have developed a diameter of 114 mm and a knife length of 50 mm as standard.
  • the rotating bell knife is subject to vibrations and deformations during operation, which impair the accuracy of the sharpening cut. Since the knife edge is constantly sharpened to the best sharpness, the knife length becomes shorter and shorter, which has to be compensated for by constant re-feeding.
  • a chip ejector bowl is arranged inside the commercially available bell knives, which is intended to ensure that the leather chips produced during sharpening are discharged. In practice, however, these chips always jam between the knife and the chip ejector shell, whereupon the machine must be stopped and cleaned.
  • a finished leather workpiece for example a handbag, a purse or a shoe
  • a large number of edges must be sharpened individually, these processes and settings being repeated in the course of the working process with each cut.
  • the industry has therefore developed sharpening machines that save the assigned height and angle positions of the guide foot and adjust the guide foot fully automatically according to the work progress.
  • the height and angle values are stored in the so-called Teach-in procedure.
  • the higher-level control device must adjust the height and angle values of the guide foot according to the current leather thickness.
  • Some sharpening machines are therefore equipped with a device that can be used to measure the material thickness of the current leather. It is a hand-operated measuring head that is placed on the leather piece with an associated potentiometer that converts the measured thickness value into a corresponding electrical value, which causes a correction of the position of the guide foot in the higher-level control device.
  • the present invention has for its object to provide a device for sharpening the edges of leather cuts, the knife can be made with practically any large diameter, without the known disadvantages of the bell knife described above.
  • the band knife lies firmly on the working intervertebral disc, with only its cutting edge protruding forward, vibrations and deformations can no longer occur, even with the largest diameters.
  • the working speed can be increased significantly.
  • Leather shavings can no longer get stuck, since the working intervertebral disc profiles itself as a chip ejector shell and the band knife lies without a gap on the working intervertebral disc.
  • a grinding apparatus is also provided in the invention, which continuously sharpens the cutting edge of the band knife.
  • a measuring device in particular in the form of a light barrier, which constantly determines the position of the cutting edge of the band knife and sends it to a Control device reports that the cutting edge automatically holds in the optimal working position.
  • facilities that have been tried and tested in other machines can in principle be used.
  • the guide foot preferably sits in front of the point at which the band knife leaves the working intervertebral disc. At this point the band knife is still sufficiently guided; at the same time, however, it already has the optimal shape for a perfectly wedge-shaped sharpening cut.
  • the guide foot can be exchanged for a guide roller. This is particularly indicated for sensitive leathers and also enables the processing speed to be increased further.
  • the speed of the feed roller is preferably adjustable, to enable an optimal adaptation of the working speed to the respective leather quality.
  • the height and angle of the guide foot can be adjusted by motor, a higher-level control device storing the height and angle values assigned to the blanks and adjusting the foot accordingly during production.
  • a measuring device which measures the thickness of the blanks.
  • This measuring device has a measuring head that can be moved against an anvil, a smooth trigger for the measuring head, a potentiometer as a measuring transducer, a drive for the measuring head and an electronic unit.
  • a major advantage of this development of the device according to the invention is that the thickness measuring device can be operated with one hand. It is sufficient to hold the piece of material to be measured in the measuring gap. As soon as the trigger, which is preferably a light barrier, has been triggered, the measuring process runs automatically and in a short time, typically in 0.1 to 0.2 seconds.
  • the electronic measuring and storage circuit is designed as an analog circuit, therefore inexpensive, fast and thanks to modern integrated circuits highly precise. In addition, it can be constructed very compactly and can also be retrofitted to older sharpening devices at practically any location that is favorable for the workflow.
  • a spring holds the measuring head in its rest position, which is defined in that the measuring gap is free for inserting the leather blank.
  • the drive which presses the measuring head onto the leather piece to be measured is an electromagnet.
  • a linear potentiometer is preferably suitable as the measuring transducer, advantageously with high resolution.
  • the sample-and-hold circuit preferably contains a relay, the contact of which mechanically separates the storage capacitor from the charging voltage generator connected as an impedance converter during the measurement pauses. Long-term storage of the voltage corresponding to the thickness measurement value is thereby achieved with little effort.
  • the height of the worktop can be adjusted, as desired for sitting or standing operation.
  • Fig. 1 shows a purely schematic view of a sharpening device, for example for use in the shoe industry.
  • An endless band knife 4 runs over both intervertebral discs 2, 2 '. This rests under tension on both intervertebral discs 2, 2'. Its cutting edge 4 'protrudes only slightly beyond the intervertebral discs 2, 2' (Fig. 2).
  • intervertebral disc 2 which forms the so-called working intervertebral disc
  • an arm 10 can be seen, to which a guide foot 7, 7 'is attached. This can be adjusted with the aid of a height adjustment 8, 8 'and an angle adjustment 9, 9' so that any desired sharpening can be produced.
  • a feed roller 6 can be seen under the guide foot 7, 7 'and in front of the band knife 4. This is barrel-shaped. Your outer contour corresponds to the contour of the band knife 4 at this point.
  • the feed roller 6 sits below the cutting edge 4 ', leaving a gap through which the leather chips are removed.
  • the front 5 of the working intervertebral disc 2 facing the cutting edge 4 ' is profiled as a chip ejector, as a result of which the chips produced are fed to the chip suction (not shown) without being able to get jammed.
  • a further drive motor 11 can be seen in the machine frame 1, which drives the drive roller 6 in rotation via a countershaft 12 and a cardan shaft 13.
  • the speed of the motor 11 is preferably adjustable in order to adapt the working speed to the respective leather quality.
  • a third drive motor 14 which drives two grinding wheels 15, which continuously grind the cutting edge 4 'of the band knife 4 to the highest sharpness, an exact positioning of the cutting edge 4' of the band knife 4 being ensured with the aid of a suitable control.
  • FIG. 3 shows a section of the working area of a band knife sharpening device.
  • the table cover 1 ' is open, so that the band knife 4 or its cutting edge 4' is accessible.
  • the guide foot 7, 7 ' is positioned, which is attached to the guide head 10 and can be adjusted in height and angle by means of the motor drives 8, 8', 9, 9 ', the height and angle positions of the Superordinate control device 30 (FIG. 1) can be set fully automatically in accordance with the work progress on the basis of values stored in the teach-in method.
  • a measuring device 20 is attached to the machine head 10. This has an anvil 21 at its lower end and a height-adjustable measuring head 22 above it. A light barrier 27 built into the anvil 21 triggers a measuring process as soon as a leather blank is held in the opening.
  • a spring 25 holds the measuring head 22 in its raised rest position.
  • An electromagnet 24 is provided as a drive for lowering the measuring head 22.
  • a linear potentiometer 23, which is responsible for the electromechanical conversion of the measured values, is inserted between the electromagnet 24 and the measuring head 22.
  • the control of the measuring process, the conversion of the measured value into an electrical signal and the storage of the same is carried out by an electronic circuit board 26.
  • the required integrated analog circuits are housed, which amplify the measuring voltage tapped at the linear potentiometer 23 so that they are temporarily stored in a storage capacitor can.
  • a sample-and-hold circuit is provided, which connects the storage capacitor to the measuring voltage generator connected as an impedance converter only during the measuring process via a relay 28.
  • One of the integrated analog circuits forms a monoflop, which controls a further relay, the switch contact of which briefly switches on the current for the electromagnet 24.
  • the voltage value stored in the storage capacitor is amplified via a further impedance converter and transmitted to the higher-level control device 30, which then corrects the standard values for the height and angular position of the guide foot 7, 7 'stored in the teach-in method in a suitable manner and the motors of the Height and angle adjustment 8, 8 ', 9, 9' controls accordingly.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Milling, Drilling, And Turning Of Wood (AREA)
EP95115592A 1994-10-11 1995-10-04 Dispositif pour parer les bords de pièces de cuir Withdrawn EP0707079A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE9416329U 1994-10-11
DE9416329U DE9416329U1 (de) 1994-10-11 1994-10-11 Vorrichtung zum Schärfen der Kanten von Zuschnitten aus Leder u.dgl.
DE19517253A DE19517253A1 (de) 1994-10-11 1995-05-11 Vorrichtung zum Schärfen der Kanten von Lederzuschnitten
DE19517253 1995-05-11

Publications (1)

Publication Number Publication Date
EP0707079A1 true EP0707079A1 (fr) 1996-04-17

Family

ID=25962522

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95115592A Withdrawn EP0707079A1 (fr) 1994-10-11 1995-10-04 Dispositif pour parer les bords de pièces de cuir

Country Status (1)

Country Link
EP (1) EP0707079A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0908111A3 (fr) * 1997-10-01 2000-09-13 COMELZ S.p.A. Machine pour le pliage et le collage des bordures de matériel en forme de feuilles, notamment pour des tiges de chaussure constitués en cuir ou en matière similaire, avec actionnement automatique
WO2005014864A3 (fr) * 2003-08-07 2005-06-02 Il Jung Jang Pareuse pour cuir
EP1672084A1 (fr) * 2004-12-14 2006-06-21 Fortuna Spezialmaschinen GmbH Procédé et dispositif pour traiter automatiquement des pièces non-métalliques flexibles
CN111227442A (zh) * 2020-02-27 2020-06-05 刘贵运 一种鞋底修边装置
CN116949226A (zh) * 2023-07-10 2023-10-27 海宁市海隆鑫纺织有限公司 一种革皮修理工具

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2137326A (en) * 1935-12-30 1938-11-22 United Shoe Machinery Corp Splitting machine
GB790884A (en) * 1955-02-16 1958-02-19 Fortuna Werke Spezialmaschinen Multiple cut cutting machine
FR2489204A1 (fr) * 1980-09-03 1982-03-05 Mercier Georges Machine a refendre notamment les cuirs et peaux, les produits textiles non tisses, les caoutchoucs, les matieres plastiques en plaques ou en rouleaux
EP0427156A2 (fr) * 1989-11-10 1991-05-15 Fortuna-Werke Maschinenfabrik GmbH Machine à parer
EP0495354A1 (fr) * 1991-01-18 1992-07-22 Fortuna-Werke Maschinenfabrik GmbH Aménagement pour traiter des pièces à usiner de tissu, en particulier en cuir ou similaires
DE9416329U1 (de) * 1994-10-11 1994-12-01 Leibrock Maschinenfabrik GmbH, 66955 Pirmasens Vorrichtung zum Schärfen der Kanten von Zuschnitten aus Leder u.dgl.

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2137326A (en) * 1935-12-30 1938-11-22 United Shoe Machinery Corp Splitting machine
GB790884A (en) * 1955-02-16 1958-02-19 Fortuna Werke Spezialmaschinen Multiple cut cutting machine
FR2489204A1 (fr) * 1980-09-03 1982-03-05 Mercier Georges Machine a refendre notamment les cuirs et peaux, les produits textiles non tisses, les caoutchoucs, les matieres plastiques en plaques ou en rouleaux
EP0427156A2 (fr) * 1989-11-10 1991-05-15 Fortuna-Werke Maschinenfabrik GmbH Machine à parer
EP0495354A1 (fr) * 1991-01-18 1992-07-22 Fortuna-Werke Maschinenfabrik GmbH Aménagement pour traiter des pièces à usiner de tissu, en particulier en cuir ou similaires
DE9416329U1 (de) * 1994-10-11 1994-12-01 Leibrock Maschinenfabrik GmbH, 66955 Pirmasens Vorrichtung zum Schärfen der Kanten von Zuschnitten aus Leder u.dgl.

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0908111A3 (fr) * 1997-10-01 2000-09-13 COMELZ S.p.A. Machine pour le pliage et le collage des bordures de matériel en forme de feuilles, notamment pour des tiges de chaussure constitués en cuir ou en matière similaire, avec actionnement automatique
WO2005014864A3 (fr) * 2003-08-07 2005-06-02 Il Jung Jang Pareuse pour cuir
EP1672084A1 (fr) * 2004-12-14 2006-06-21 Fortuna Spezialmaschinen GmbH Procédé et dispositif pour traiter automatiquement des pièces non-métalliques flexibles
CN111227442A (zh) * 2020-02-27 2020-06-05 刘贵运 一种鞋底修边装置
CN111227442B (zh) * 2020-02-27 2021-06-11 刘贵运 一种鞋底修边装置
CN116949226A (zh) * 2023-07-10 2023-10-27 海宁市海隆鑫纺织有限公司 一种革皮修理工具

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