EP0505666A1 - Machine pour enrouler le cuir en forme de rouleau - Google Patents

Machine pour enrouler le cuir en forme de rouleau Download PDF

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Publication number
EP0505666A1
EP0505666A1 EP91850111A EP91850111A EP0505666A1 EP 0505666 A1 EP0505666 A1 EP 0505666A1 EP 91850111 A EP91850111 A EP 91850111A EP 91850111 A EP91850111 A EP 91850111A EP 0505666 A1 EP0505666 A1 EP 0505666A1
Authority
EP
European Patent Office
Prior art keywords
web
leather
rolls
machine
pocket
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.)
Granted
Application number
EP91850111A
Other languages
German (de)
English (en)
Other versions
EP0505666B1 (fr
Inventor
Christer Fredelin
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.)
ELMO-CALF
Original Assignee
ELMO-CALF
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 ELMO-CALF filed Critical ELMO-CALF
Publication of EP0505666A1 publication Critical patent/EP0505666A1/fr
Application granted granted Critical
Publication of EP0505666B1 publication Critical patent/EP0505666B1/fr
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
    • C14B1/00—Manufacture of leather; Machines or devices therefor
    • C14B1/62—Winding or stacking hides or leather
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H19/00—Changing the web roll
    • B65H19/22—Changing the web roll in winding mechanisms or in connection with winding operations
    • B65H19/2238—The web roll being driven by a winding mechanism of the nip or tangential drive type

Definitions

  • the present invention relates to a machine by means of which leather can be rolled-up onto a support cylinder with the aid of a drive motor.
  • leather pieces In the leather industry, animal hides are prepared for tanning to form leather, in certain instances referred to as skins. The leather is then transported to refining industries, for instance furniture industries or baggage-making industries. Leather pieces that are prepared from hides normally have an area of 0.5-6 m2 and a thickness of 0.3-1.6 mm. These leather pieces must be delivered to the users in a completely smooth state and no pleats or folds whatsoever are allowed. It has long been found that the most reliable manner of transporting such leather pieces is to roll the leathers onto support cylinders. These cylinders are preferably made of paper-board and are at least 1 dm in diameter. A cylinder length of 1.5 m will suffice, even when the width of the leather is more than 2 m.
  • a number of leather pieces are rolled on one and the same cylinder, in accordance with customers' wishes.
  • one cylinder may carry up to ten leather pieces, all of which must be completely smooth, without the resemblance of a crinkle or fold. The significance of this requirement will be obvious to those who are aware of the irregularities in animal hides from the time of slaughter, an irregularity which becomes more pronounced subsequent to the tanning process.
  • the cylinder will have reached a position inwards of the table extremities which makes it necessary for the two workmen to pull the cylinder towards them, so that rolling-up of the leather can continue.
  • This pulling of the cylinder must take place at a uniform speed and quite simultaneously at both cylinder ends, so as to prevent buckling or bulging of the leather. If care is not taken, a buckle will be rolled-on by the cylinder and perhaps impair the quality of the leather, even though no fold should be rolled-up with the leather.
  • Weight determines the number of leathers that can be rolled-up on one and the same cylinder, without rendering the cylinder unmanageable.
  • the present invention provides a machine with which leathers can be rolled smoothly and free from folds onto delivery cylinders in a reliable and efficient manner, which is thus the object of the invention.
  • the inventive machine by means of which this object is achieved has the characteristic features set forth in the following Claims.
  • the machine comprises a machine stand, a plurality of rollers journalled in the stand, and an endless web, preferably made of PVC, extending around said rollers. Mounted at a given location adjacent the edges of the web are two mutually opposed rollers which are carried by pivotal devices. The rollers function to draw the web in between the rolls to form a pocket in which a cylinder on which leather is rolled can be placed. In order to compensate for the length of web taken-up to form the pocket, the machine includes a stretching or tensioning roll, which is preferably vertically movable and is partially weight-compensated by pneumatic piston-cylinder devices connected to the ends thereof.
  • a stretching or tensioning roll which is preferably vertically movable and is partially weight-compensated by pneumatic piston-cylinder devices connected to the ends thereof.
  • the web is driven in a direction such as to move into the pocket and around the positionally movable rollers.
  • the web runs on a table located forwardly of the pocket, where the leathers to be rolled onto the cylinder can be smoothed out. This can take place with the web stationary, whereafter two workmen start-up the machine, with the aid of a foot-controlled double-command.
  • the tension roll is raised progressively as the leather is rolled-up smoothly on the cylinder to a rotational position of more than 180° embraced by the pocket.
  • the machine may conveniently be provided with a gear motor.
  • This motor may be provided with a frequency converter, for maximum speed control.
  • the motor is conveniently connected for direct drive of a first drive roll and power is transmitted between this drive roll and a second drive roll on the input side of the feed table by means of a drive chain.
  • the second drive roll Since forming the pocket, the second drive roll will preferably feed-in a greater length of web per unit of time than the length of web that is drawn-out from the pocket, it has been found advantageous to use for the second drive roll a toothed wheel, or sprocket wheel, having fewer teeth than the teeth on the first drive roll.
  • the shafts of said rolls are provided with friction couplings or magnetic couplings connected to the toothed wheels.
  • the web is stopped and the pocket-forming rollers moved to their starting positions.
  • the stretching roll is lowered such as to straighten-out the pocket, and the rolled leather is moved forwards on the feed table.
  • a reciprocatingly movable, preferably chain-driven traversing lifting device mounted on the side-members of the machine stand is then moved in over the feed table.
  • a gripping device is then lowered over the leather roll by means of an angled arm guided by a pneumatic-cylinder device. Two mutually hinged plates of part-cylindrical configuration are opened so as to embrace the leather roll.
  • the plates are then closed by means of pneumatic piston-cylinder devices into clamping engagement with the leather roll, whereafter the gripping device is raised and the overhead lifting device is returned to the rear side of the machine, where the leather roll is deposited onto a receiving table for subsequent transportation to a packaging department.
  • the machine includes photocells which are arranged mutually opposite one another on both sides of the web. Should the web be moved towards one side or the other, the web will break the light beam projected by the photocell on the side concerned, causing the photocell to deliver a signal to an air valve. In response, the valve will open and therewith increase the air-pressure in a pneumatic piston-cylinder device which therewith moves a stretching roll against the edge of the web, so as to centre the web in the machine.
  • the pressure on the stretching rolls and also the pressure exerted by the stretching rolls are controlled in a manner such that the web will normally move at the same speed as the speed of the drive rollers.
  • the drive rollers have a drive surface such that friction against the web can readily be overcome. Consequently, the web is able to slide or slip slightly on the drive rollers. This has been found advantageous in those cases when the leather roll is given a hardness appropriate to certain leather qualities.
  • the machine is constructed so that they need only activate a peddle control in order to initiate movement of the web, this peddle control being connected to a double-command means.
  • the motor is also provided with a start-and-stop control.
  • the machine is controlled in other respects by means of a computer in which all the air-pressure set-point values are programmed, together with the rotational speed of the pocket-forming stretching rolls.
  • Other parameters, including the serial sequence of the machine operations have also been programmed in the computer, whereby all procedures from the time of forming the pocket to the time of transferring the finished leather roll, which is finally wrapped with self-adhesive paper, are programmed in a given sequence. It has surprisingly been found that this programming of the procedural steps enables leather to be rolled in the absence of a support cylinder.
  • a machine for rolling leather onto support cylinders or cores comprises a floor-mounted stand 1.
  • the stand 1 includes two side members 2, 3 in which a number of rolls are journalled.
  • the machine is driven by a gear motor to which electric current is supplied via a frequency converter, for the purpose of controlling the operating speed of the machine.
  • This motor is connected directly to a first drive roll 5 which is connected to a second drive roll 7 by means of a chain 6.
  • the chain 6 turns over toothed wheels 8 and 9 on respective first and second drive rolls.
  • the toothed wheel 9 of the second drive roll 7 has fewer teeth than the toothed wheel 8 of the first drive roll 5.
  • Mounted between the toothed wheels 8, 9 and the shafts of respective drive rolls are friction couplings, or magnetic couplings, which enable the drive rolls 5, 7 to rotate at smaller speed differentials than otherwise made possible by the number of teeth on the wheels
  • the machine includes rollers 10 which act on both sides of the web 4 such as to form a pocket or "hollow” in which a support cylinder on which the leather is rolled can rotate.
  • These pocket-forming rollers 10 are attached to angled, pivotally movable arms 11. Pivotal movement of the angled arms 11 is controlled by pneumatic piston-cylinder devices, not shown.
  • the rollers 10 are rotated to draw-in sufficient web between an upper guide roll 12 and a lower support roll 25 to form a pocket, in which the support cylinder or core is placed.
  • the cylinder is caused to rotate by the web 4 as the web is driven round in the machine.
  • the web moves forwardly of the thus formed pocket smoothly over a feed table 13, on which the leather is successively laid-up.
  • the web 4 moves the leather from the feed table 13 into the pocket and around the support cylinder, and the thus-formed leather roll increases in diameter with each revolution of the cylinder. That part of the web 4 which embraces the leather roll constitutes a progressively greater length of the web.
  • a web-stretching or pulling roll 14 is raised.
  • This stretching roll are connected to respective pneumatic piston-cylinder devices 15, which can either relieve the weight of the stretching roll 14, and therewith stretching of the web 4, or increase the stretching force on the web 4 by a downwardly acting force.
  • pneumatic piston-cylinder devices 15 which can either relieve the weight of the stretching roll 14, and therewith stretching of the web 4, or increase the stretching force on the web 4 by a downwardly acting force. Which of the operating modes of the pneumatic piston-cylinder devices 15 is selected depends on how firmly the leather is to be wound onto the support cylinder.
  • the web 4 is stopped and the guide roll or turn roll 12 raised, subsequent to having rolled-up the desired number of leathers on the support cylinder.
  • the stretching roll 14 is lowered and the depth of the pocket reduced by moving the rollers 10 forwards, thereby moving the leather roll out onto the feed table 13.
  • the leather last rolled onto the cylinder is taped-down with the aid of self-adhesive paper introduced into the pocket as a final stage of the leather rolling or winding operation.
  • a traversing lifting device 16 which can be moved over the two side-members 2, 3 is moved over to a position above the feed table.
  • the lifting device 16 carries on its underside a gripping device 17 which comprises two hemi-spherical plates 18 and 19.
  • the plates are mutually hinged by a hinge arrangement 20 and at least one plate 19 is movable in relation to an angle arm 21 on which the gripping device 17 is mounted.
  • the angle arm 21 is guided by a pneumatic piston-cylinder device 22 such as to enable the gripping device 17 to be opened and lowered over the leather roll on the feed table 13.
  • the plate 19 can be moved forwards by means of a small pneumatic piston-cylinder device 23, such that the gripping device 17 will embrace the leather roll.
  • a plexiglass sheet 24 is mounted in front of the plate 18, as a safety guard against clamping damage and in order to enable the machine operator to supervise the gripping movement of said device.
  • the roll is lifted and the lifting device 16 is rolled to the rear side of the machine, where the leather roll can be deposited on a receiving table (not shown) which functions as a temporary storage prior to packaging the leather roll.
  • the various working operations of the machine are computer controlled.
  • the computer can be programmed to control the total speed of the machine and also the speed of each individual part operation.
  • the computer can be programmed to control the speed at which the pocket is formed at the initial stage of the leather-rolling operation.
  • the pressure in each pneumatic piston-cylinder device can be determined both with respect to time and with respect to total final pressure. In this way, the pressure in the pneumatic piston-cylinder device 15 can be controlled so that the web-stretching or web-pulling roll will hold the web so extended during the introduction of the leather-rolling operation that the first turns of leather wound onto the support cylinder will be wound firmly whereas the subsequent turns will be wound more loosely, or vice versa.

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)
  • Treatment Of Fiber Materials (AREA)
  • Winding Of Webs (AREA)
EP91850111A 1991-03-28 1991-05-02 Machine pour enrouler le cuir en forme de rouleau Expired - Lifetime EP0505666B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9100955A SE468169B (sv) 1991-03-28 1991-03-28 Maskin foer motordriven upprullning av laeder
SE9100955 1991-03-28

Publications (2)

Publication Number Publication Date
EP0505666A1 true EP0505666A1 (fr) 1992-09-30
EP0505666B1 EP0505666B1 (fr) 1996-08-14

Family

ID=20382322

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91850111A Expired - Lifetime EP0505666B1 (fr) 1991-03-28 1991-05-02 Machine pour enrouler le cuir en forme de rouleau

Country Status (4)

Country Link
EP (1) EP0505666B1 (fr)
AT (1) ATE141336T1 (fr)
DE (1) DE69121387D1 (fr)
SE (1) SE468169B (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3111795A (en) * 1961-08-16 1963-11-26 Albert Trostel & Sons Co Apparatus for and method of bundling hides and skins, or parts thereof
GB1212357A (en) * 1967-10-20 1970-11-18 Franco Ivaldi Method of and apparatus for handling hides or skins
US4034928A (en) * 1976-06-29 1977-07-12 Union Carbide Corporation Method and apparatus for producing coreless roll assemblies of separable bags
EP0095790A1 (fr) * 1982-05-20 1983-12-07 Agfa-Gevaert N.V. Appareil pour collecter et stocker temporairement des feuilles
EP0296113A1 (fr) * 1987-06-16 1988-12-21 GebràœDer Sulzer Aktiengesellschaft Dispositif de transport pour le tissage

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3111795A (en) * 1961-08-16 1963-11-26 Albert Trostel & Sons Co Apparatus for and method of bundling hides and skins, or parts thereof
GB1212357A (en) * 1967-10-20 1970-11-18 Franco Ivaldi Method of and apparatus for handling hides or skins
US4034928A (en) * 1976-06-29 1977-07-12 Union Carbide Corporation Method and apparatus for producing coreless roll assemblies of separable bags
EP0095790A1 (fr) * 1982-05-20 1983-12-07 Agfa-Gevaert N.V. Appareil pour collecter et stocker temporairement des feuilles
EP0296113A1 (fr) * 1987-06-16 1988-12-21 GebràœDer Sulzer Aktiengesellschaft Dispositif de transport pour le tissage

Also Published As

Publication number Publication date
ATE141336T1 (de) 1996-08-15
SE468169B (sv) 1992-11-16
EP0505666B1 (fr) 1996-08-14
SE9100955L (sv) 1992-09-29
SE9100955D0 (sv) 1991-03-28
DE69121387D1 (de) 1996-09-19

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