EP0288264A2 - Procédé d'étandage du cuir et appareil pour l'application du procédé - Google Patents

Procédé d'étandage du cuir et appareil pour l'application du procédé Download PDF

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Publication number
EP0288264A2
EP0288264A2 EP88303553A EP88303553A EP0288264A2 EP 0288264 A2 EP0288264 A2 EP 0288264A2 EP 88303553 A EP88303553 A EP 88303553A EP 88303553 A EP88303553 A EP 88303553A EP 0288264 A2 EP0288264 A2 EP 0288264A2
Authority
EP
European Patent Office
Prior art keywords
resilient
studs
leather
belts
recesses
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Withdrawn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
EP88303553A
Other languages
German (de)
English (en)
Other versions
EP0288264A3 (fr
Inventor
Josef Hanacek
Vladislav Janirek
Frantisek Kubicek
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.)
Vyzkumny Ustav Kozedelny
Original Assignee
Vyzkumny Ustav Kozedelny
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 CS872783A external-priority patent/CS263518B1/cs
Priority claimed from CS877594A external-priority patent/CS263724B1/cs
Application filed by Vyzkumny Ustav Kozedelny filed Critical Vyzkumny Ustav Kozedelny
Publication of EP0288264A2 publication Critical patent/EP0288264A2/fr
Publication of EP0288264A3 publication Critical patent/EP0288264A3/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Withdrawn legal-status Critical Current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
    • C14B1/26—Leather tensioning or stretching frames; Stretching-machines; Setting-out boards; Pasting boards
    • 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
    • C14B1/40—Softening or making skins or leather supple, e.g. by staking, boarding, or crippling machines, by dry mills

Definitions

  • This invention relates to a method of area-stretching of leather inserted between two resilient belts with which they are alternatively and cyclically either moved (fed) between a set of recesses and a set of studs, either stretched by revesible shifting (pushing-in) of said studs into said opposite recesses.
  • This invention also relates to an apparatus for carrying out the method which comprises two resilient belts which are movable in a plane extending between a set of pulling studs, which are modified for reversible shifting motion into these opposite recesses.
  • a method of area-stretching (staking) in which the leather is clamped between two resilient membranes and then is stretched, together with the membranes, in the directions from its centre radially to its periphery.
  • a disadvantage of this method is that is requires too much handling work in connection with inserting pieces of leather between the membranes and their removing. Therefore this method is too laborious.
  • Known apparatus for carrying out this method of area stretching of leather comprises two separated layers of resilient material which form two said membranes. At least one of these layers of resilient material is guyed (fastened) on its circumference to piston rods of pressure cylinders. The treated leather is inserted between these two layers of resilient material, by and between which it is then clamped by a pressure device. Then the pressure cylinders are caused to act and their piston rods begin to area-stretch the layer of resilient material which is guyed to them, this area-stretching being thus caused from the centre radially to the circumference of the whole layer of resilient material. Because of friction, the other layer of resilient material and also the treated leather are area-stretched.
  • both the layers of resilient material are separately fastened to frames.
  • the treated leather is also clamped between these layers of resilient material which then begin area-stretch by pressured air of liquid, or by vacuum, or by a shifting punch.
  • the layers of resilient material area area-stretched, the leather which is clamped between them, is area-stretched too.
  • the disadvantage of both these apparatuses is that they cannot be incorporated into continuous working lines. As a matter of fact, the treated leather must be manually layed between the layers of resilient material and at the end of the working operation it must be manually removed.
  • the pulling studs of the first set are arranged opposite the centres of the spaces which are left between fixed studs of the second set. The spaces, as a matter of fact, thus create demarcations of the recesses into which are pushed the resilient belts, even with the leather inserted between them.
  • the leather is thus softened and area-stretched in consequence of friction of the studs of both sets.
  • the effect of softening and stretching is very non-uniform in individual places of the leather, as is also the friction between the resilient belts with the treated leather and the studs of both sets.
  • the nearer is the place, which is being treated by the particular pulling stud, to the centre of the leather and to the centre of surface arrangement of the studs of both sets, to the more intensive softening and area-stretching is this place subjected. This is caused because in the vicinity of this place the leather is treated, at the same time, by the highest possible number of the other pulling studs and thus the leather is here subjected to the highest possible friction of the studs of both sets.
  • the endless rope loops are symmetrically deviated from the longitudinal axis of the feeding movement to both sides.
  • the highest effect of waving (corrigating) and staking, and thus also of area-stretching is at the place of longitudinal axis of the leather and in recesses 30.
  • the pulling studs 21 are so located that their rounded ends are directed into the centres of the opposite recesses 30.
  • the resilient belts 4, 5 run on respective guide rollers 41, 51 and driving rollers 42, 52 which are connected with driving units (not shown).
  • the upper branch of the bottom resilient belt 4, together with the bottom branch of the upper resilient belt 5 thus form a belt conveyor extending in the plane p and movable in the direction s.
  • the plane p is parallel to the planes containing the bottom ends of the pulling studs 21 and the upper ends of the clamping studs 31.
  • the beginning of the upper branch of the bottom resilient belt 4 is extended upstream of the beginning of the bottom branch of the upper resilient belt 5 and a table 6 for depositing leather u is annexed thereto.
  • the bottom stretchers 3 are provided with extensions 32 by which they are mounted in guides 11 which are arranged on the frame 1 of the apparatus.
  • the extensions 32 are connected to a driving unit (not shown) for vertical reciprocation in the guides 11.
  • On the upper ends of the clamping studs 31 are provided substantially flat contact surfaces 31r.
  • the clamping studs 31 which demarcate the last row of the recesses 30, viewed in the direction s, are shorter than the other clamping studs 31, so that their contact surfaces 31 r are lower by a value h (Fig 7).
  • the driving rollers 42, 42 continuously rotate and thus continuously move the resilient belts 4, 5 in the direction s.
  • the leather u, to be treated, is manually deposited onto the table 6 or is automatically supplied from a preceding working operation of the technological process of leather production.
  • each leather u successively enters between the resilient belts 4, 5 and together with them passes between the sets of recesses 30 and pulling studs 21.
  • the bottom stretchers 3 are reciprocated by their extensions 32 movable in vertical direction in the guides 11. When in their basic position, the bottom ends of the pulling studs 21 (Fig. 2) and the resilient plates 22 are safely above the upper resilient belt 5.
  • the bottom stretchers 3 are in their basic position at their bottom dead centre so that the contact surfaces 31 r of the clamping studs 31 are safely under the bottom resilient belt 4.
  • both the resilient belts 4, 5 together with the leather u move by a certain distance in the direction s.
  • the clamping studs 31 bear against the resilient belts 4, 5, and the leather u, between them and press all these layers, against the resilient plates 22.
  • these resilient plates 22 are compressed to a desired degree due to deformability of the layer 22a of elastic material or of the springs 22c.
  • the resilient belts 4,5 mutually clamp themselves , one opposite to the other, at peripheral places of the recesses 30, which are demarcated by the contact surfaces 31 r of the clamping studs 31.
  • This phase of the shifting motion of the bottom stretchers 3 is illustrated in Fig. 3.
  • the pulling studs 21 progressively enter into the opposite recesses 30, and at the same time the clamping studs 31, which demarcate these recesses 30, compress more and more intensively the resilient belts 4, 5 and the treated leather u, by their contact surfaces 31 r onto the resilient plates 22, which are more and more compressed, as necessary.
  • the entering of the pulling studs 21 into the recesses 30 pushes the adjacent portions of the resilient belts 4, 5, together with the adjacent portions of the treated leather u, into the recesses 30.
  • the bottom stretchers 3 When the bottom stretchers 3 reach their upper dead centre, they begin to move downwards to their basic position in the bottom dead centre. When the bottom stretchers 3 reach this position, the pulling studs 21 are fully withdrawn from the recesses 30 and the resilient belts 4, 5, together with the treated leather u, are released. At the same time, due to the elasticity of the layer 22a, or of the springs 22c, the resilient plates 22 also return to their basic position. During the stretching cycle the resilient belts 4, 5 were continuously moved by the driving rollers 42, 52, and were consequently elongated in section behind the output of the last pair of the bottom stetcher 3 and the upper stretcher 2.
  • the value of this elongation is proportional to the length of the possible (but not performed) movement of the resilient belts 4, 5 during the time, which is equal to the delay of the whole stretching cycle, during which this movement was made impossible.
  • the resilient belts 4, 5 move in the direction s, either due to compensation of this arisen length extension, either due to next rotating movement of the driving roller 42, 52.
  • the bottom stretchers 3 begin to move again to their upper dead centre and the next stretching cycle begins.
  • the treated leather u is stretched under substantially lower stress, this being caused by the contact surfaces 31r which are lower by the value h compared with the contact surfaces 31r of all the preceding rows of clamping studs 31.
  • the leather u is here, in fact, only very midly squeezed and thus any baffle marks which might have been caused by the pulling studs 21 in the preceding stages are advantageously removed.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Treatment And Processing Of Natural Fur Or Leather (AREA)
EP88303553A 1987-04-21 1988-04-20 Procédé d'étandage du cuir et appareil pour l'application du procédé Withdrawn EP0288264A3 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
CS872783A CS263518B1 (cs) 1987-04-21 1987-04-21 Způsob plošného protahování usní
CS2783/87 1987-04-21
CS7594/87 1987-10-22
CS877594A CS263724B1 (cs) 1987-10-22 1987-10-22 Zařízení k plošnému protahování usní

Publications (2)

Publication Number Publication Date
EP0288264A2 true EP0288264A2 (fr) 1988-10-26
EP0288264A3 EP0288264A3 (fr) 1990-07-04

Family

ID=25745684

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88303553A Withdrawn EP0288264A3 (fr) 1987-04-21 1988-04-20 Procédé d'étandage du cuir et appareil pour l'application du procédé

Country Status (5)

Country Link
EP (1) EP0288264A3 (fr)
BR (1) BR8801876A (fr)
DE (1) DE288264T1 (fr)
ES (1) ES2004849A4 (fr)
FI (1) FI881741A (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5184487A (en) * 1989-10-13 1993-02-09 Officine Di Cartigliano S.P.A. Machine for softening and stretching laminar products, particularly tanned hides
US6112559A (en) * 1995-11-06 2000-09-05 Emilio Buttazzi Hide stretching apparatus
ITVI20090051A1 (it) * 2009-03-10 2010-09-11 Baggio Tecnologie Srl Metodo di allargatura in continuo di elementi laminari flessibili e linea di allargatura che realizza tale metodo
US11072833B2 (en) * 2018-11-08 2021-07-27 Korona Corporation Wet leather stretching device

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE319942C (de) * 1919-08-30 1920-04-06 Carl Rausch Krispelmaschine
US2956427A (en) * 1957-09-26 1960-10-18 Ellen B Jenkins Suppling method and apparatus
US3398557A (en) * 1966-06-13 1968-08-27 Strojosvit Np Leather softening machine
DE1285092B (de) * 1962-06-25 1974-02-07 Strojosvit, närodni podnik, Krnov (Tschechoslowakei) Vorrichtung zum Geschmeidigmachen von Leder

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE319942C (de) * 1919-08-30 1920-04-06 Carl Rausch Krispelmaschine
US2956427A (en) * 1957-09-26 1960-10-18 Ellen B Jenkins Suppling method and apparatus
DE1285092B (de) * 1962-06-25 1974-02-07 Strojosvit, närodni podnik, Krnov (Tschechoslowakei) Vorrichtung zum Geschmeidigmachen von Leder
US3398557A (en) * 1966-06-13 1968-08-27 Strojosvit Np Leather softening machine

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5184487A (en) * 1989-10-13 1993-02-09 Officine Di Cartigliano S.P.A. Machine for softening and stretching laminar products, particularly tanned hides
US6112559A (en) * 1995-11-06 2000-09-05 Emilio Buttazzi Hide stretching apparatus
ITVI20090051A1 (it) * 2009-03-10 2010-09-11 Baggio Tecnologie Srl Metodo di allargatura in continuo di elementi laminari flessibili e linea di allargatura che realizza tale metodo
US11072833B2 (en) * 2018-11-08 2021-07-27 Korona Corporation Wet leather stretching device

Also Published As

Publication number Publication date
FI881741A (fi) 1988-10-22
DE288264T1 (de) 1989-04-20
ES2004849A4 (es) 1989-02-16
EP0288264A3 (fr) 1990-07-04
BR8801876A (pt) 1988-11-22
FI881741A0 (fi) 1988-04-14

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