EP0351379A2 - Walzmaschine zum Bearbeiten von Leder, Häuten und sonstigem zur Vermeidung der Bildung von Randabfällen - Google Patents

Walzmaschine zum Bearbeiten von Leder, Häuten und sonstigem zur Vermeidung der Bildung von Randabfällen Download PDF

Info

Publication number: EP0351379A2
Authority: EP; European Patent Office
Prior art keywords: cylinder; pressure roller; roller; carriage; machine according
Prior art date: 1988-07-05
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

EP89830307A

Other languages

English (en)

French (fr)

Other versions

EP0351379A3 (de

EP0351379B1 (de

Inventor

Luigi Maffei

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.)

Officina Meccanica Md Di Maffei Luigi & C SNC

Original Assignee

Officina Meccanica Md Di Maffei Luigi & C SNC

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.)

1988-07-05

Filing date

1989-07-04

Publication date

1990-01-17

1989-07-04 Application filed by Officina Meccanica Md Di Maffei Luigi & C SNC filed Critical Officina Meccanica Md Di Maffei Luigi & C SNC

1990-01-17 Publication of EP0351379A2 publication Critical patent/EP0351379A2/de

1991-09-04 Publication of EP0351379A3 publication Critical patent/EP0351379A3/de

1995-09-27 Application granted granted Critical

1995-09-27 Publication of EP0351379B1 publication Critical patent/EP0351379B1/de

2009-07-04 Anticipated expiration legal-status Critical

Status 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
- C14B1/30—Pressing or rolling leather
- C14B1/34—Pressing or rolling leather by rotating movement of the pressing or rolling elements
- C14B1/36—Bridge leather-rolling machines

Definitions

This operation is an operation which has the aim of polishing, hardening and compacting the leather. It is executed by exerting a mechanical action by means of a cylinder - from which the term "rolling" is derived - which rolls on the material to be treated by exerting a compression action which often amounts to a few tens of tonnes.
the machine comprises (see figs. 1 to 3): a structure 1 comprising a bench 1A, the upper surface 18 of which constitutes the work surface, two uprights 1C and an upper cross member 1D; a carriage 3 which can be slid along the cross-member 1D and which fulfills the function of supporting a crazy pressure roller or cylinder 5, which rotates around its own horizontal axis and moves with the carriage 3, said roller or cylinder having the possibility of moving vertically and therefore of varying its distance from the worktop 1B, while being urged against it.
the horizontal translational movement of the carriage 3 is generally controlled by a screw or another system.
the action of the roller 5 and its pressure contact on the material M to be treated are ensured by hydraulic or mechanical systems and by an elastic system (consisting of springs or hydraulic gas accumulators) in order to compensate for the variations in thickness of the material. .
the material M is therefore located between the work surface 1B and the movable roller 5, and it is traversed by the roller 5 over its entire length, alternately one or more times; successively, if said material M has a width greater than that of the roller, it is moved manually by the attendant operator, so as to ensure that the rolling is carried out over the entire surface.
the second drawback is able to cause damage to the very structure of the material and also changes in coloring in the region of the input and output edge, due to very high localized pressures; this requires the cutting and therefore the elimination of these highly deformed zones, and consequently with a significant loss of material percentages in addition to that of time for the execution of the operation.
the invention aims to eliminate these drawbacks.
the rolling machine comprises: abutment means for stopping the pressure roller or cylinder at a distance from the work surface less than the thickness to which the material must be reduced; and motorization means for imposing on said roller or cylinder rotations in opposite directions as a function of the direction of movement of the carriage.
Said motorization means intervene before the contact of the roller or cylinder with the material to be treated takes place and at least until the contact has occurred. Means can also be provided for braking the pressure roller or cylinder.
the above abutment means are adjustable in depending on the thickness of the material to be treated.
the pressure roller or cylinder is practically supported by oscillating levers urged by thrust systems with piston-cylinder; the amplitude of the movement of said levers is adjusted by screw means in correlation with the thickness of the material in work.
a control switch for reversing the movement of the carriage and of the pressure roller or cylinder is actuated by one of said levers as a function of the displacement to which the said lever is subjected according to the lowering of the pressure roller or cylinder which passes the edge of the working material.
11A is indicated the bench of structure 1 and by 11B is indicated the surface upper constituting the work plan.
M is indicated the material placed on the work surface 11B.
11D is indicated the upper cross member along which the carriage 13 slides. The above-mentioned carriage, according to FIGS. 4 and 5, is engaged in the cross member 11D by means of lower wheels or rollers 13A and upper wheels 13B.
the pressure roller or cylinder 15 is mounted by means of supports 17 on a pair of levers 19 which are articulated at 21 to the structure of the carriage 13.
the pressure roller or cylinder 15 is coupled to a motor and braking group generally indicated by 23, equipped with a suitable reducer; the group 23 is able to actuate the cylinder in rotation in both directions with an inversion which can be accompanied by a mechanical or electromagnetic braking action.
the group 23 can be placed outside one of the levers 19.
the levers 19 are urged to exert pressure towards the surface of the work surface 11B and therefore to act on the material M by means of cylinder-piston thrust systems 25.
the angular amplitude of the levers 19 around the joints 21 towards the plane of work 11B is limited by the presence of rods 27 which, by passing through suitable seats drilled in the carriage 13, have adjustment sleeves 29 screwed onto the rods 27 and capable of stopping the levers 19 in a position such as a stop be created and that an adjustable and desired spacing of the pressure roller or cylinder of the worktop 11B is obtained.
the setting depends on the thickness 5 of the material M in work, or better still on the final thickness So which will be reached by the material M.
At least one of the levers 19 is capable of acting on a switch 31 which is predisposed to control the reversal of the movement of the carriage and the reversal of the direction of rotation of the pressure roller or cylinder 15 in accordance with the direction of movement of the carriage 13; reversing the direction of rotation of the cylinder 15 can be facilitated by a temporary braking action.
the switch can be adjustable depending on the thickness of the material.
the pressure roller or cylinder acts on the material M
the working pressure is exerted by the push cylinders 25.
the cylinder 15 loses contact with the material M, it can undergo only a small stroke of lowering towards the work surface 11B, this stroke being limited by the stop represented by the adjustment sleeves 29; the consecutive and limited movement of the levers 19 causes the switch 31 to start operating and in this way reversing the movement of the carriage and the rotation of the pressure roller or cylinder 15.
the cylinder 15 thus quickly comes back into contact with material M without slipping on it and without damage edge of the material itself.
the substantial difference between traditional machines and the machine according to the invention consists in the fact that the pressure roller or cylinder 15 is kept away from the work surface 11B and it is rotated and braked by its own motor system 23 at the most. less when it is not in contact with the material M to be rolled, the rotation and the reversal of the direction of rotation of the roller or cylinder being no longer conditioned by the contact between roller and work surface.
This motor system 23 of the roller or cylinder 15 has the function of slowing down and stopping the roller when it comes out of the working material and reverses the direction of rotation before causing it to rise again on the material M, by imposing a tangential speed roughly corresponding to that of translation of the carriage.
roller or cylinder 15 does not come into contact with the work surface 11B when it descends from the leather and the roller itself will no longer descend from the value So, equal to the thickness of the material M deformed, but considerably less.
the roller or cylinder 15 comes back into contact with the material M to be rolled, it is already rotating at a peripheral speed equal to that of translation of the carriage, so that it does not cause any displacement of the material M but it rises on it and it should only be lifted by mid amounts nimes.

Landscapes

Engineering & Computer Science (AREA)
Manufacturing & Machinery (AREA)
Mechanical Engineering (AREA)
Chemical & Material Sciences (AREA)
Organic Chemistry (AREA)
Soil Working Implements (AREA)
Metal Rolling (AREA)
Milling, Drilling, And Turning Of Wood (AREA)

EP89830307A 1988-07-05 1989-07-04 Walzmaschine zum Bearbeiten von Leder, Häuten und sonstigem zur Vermeidung der Bildung von Randabfällen Expired - Lifetime EP0351379B1 (de)

Applications Claiming Priority (2)

Application Number	Priority Date	Filing Date	Title
IT944188		1988-07-05
IT8809441A IT1224977B (it)	1988-07-05	1988-07-05	Macchina cilindratrice per il trattamento di cuoio, pelli ed altro escludendo la generazione di scarti ai bordi

Publications (3)

Publication Number	Publication Date
EP0351379A2 true EP0351379A2 (de)	1990-01-17
EP0351379A3 EP0351379A3 (de)	1991-09-04
EP0351379B1 EP0351379B1 (de)	1995-09-27

Family

ID=11130191

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
EP89830307A Expired - Lifetime EP0351379B1 (de)	1988-07-05	1989-07-04	Walzmaschine zum Bearbeiten von Leder, Häuten und sonstigem zur Vermeidung der Bildung von Randabfällen

Country Status (4)

Country	Link
EP (1)	EP0351379B1 (de)
DE (1)	DE68924379T2 (de)
ES (1)	ES2077588T3 (de)
IT (1)	IT1224977B (de)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
DE637551C (de) *	1934-12-02	1936-10-30	Badische Maschinenfabriku Eise	Karrenlederwalze
FR1106805A (fr) *	1954-07-13	1955-12-23	D App Modernes Soc Ind De Cons	Machine à brillanter et à repasser les fourrures
AT258450B (de) *	1964-06-03	1967-11-27	Strojosvit Np	Steuereinrichtung zum selbsttätigen Reversieren eines Wagens samt Walze an Leder-Brückenwalzmaschinen

1988
- 1988-07-05 IT IT8809441A patent/IT1224977B/it active
1989
- 1989-07-04 EP EP89830307A patent/EP0351379B1/de not_active Expired - Lifetime
- 1989-07-04 DE DE68924379T patent/DE68924379T2/de not_active Expired - Fee Related
- 1989-07-04 ES ES89830307T patent/ES2077588T3/es not_active Expired - Lifetime

Also Published As

Publication number	Publication date
IT8809441A0 (it)	1988-07-05
DE68924379D1 (de)	1995-11-02
DE68924379T2 (de)	1996-03-21
EP0351379A3 (de)	1991-09-04
EP0351379B1 (de)	1995-09-27
IT1224977B (it)	1990-10-30
ES2077588T3 (es)	1995-12-01

Legal Events

Date	Code	Title	Description
1989-12-02	PUAI	Public reference made under article 153(3) epc to a published international application that has entered the european phase	Free format text: ORIGINAL CODE: 0009012
1990-01-17	AK	Designated contracting states	Kind code of ref document: A2 Designated state(s): DE ES FR
1991-07-16	PUAL	Search report despatched	Free format text: ORIGINAL CODE: 0009013
1991-09-04	AK	Designated contracting states	Kind code of ref document: A3 Designated state(s): DE ES FR
1992-03-04	17P	Request for examination filed	Effective date: 19911218
1994-01-12	17Q	First examination report despatched	Effective date: 19931129
1995-08-11	GRAA	(expected) grant	Free format text: ORIGINAL CODE: 0009210
1995-09-27	AK	Designated contracting states	Kind code of ref document: B1 Designated state(s): DE ES FR
1995-11-02	REF	Corresponds to:	Ref document number: 68924379 Country of ref document: DE Date of ref document: 19951102
1995-12-01	REG	Reference to a national code	Ref country code: ES Ref legal event code: FG2A Ref document number: 2077588 Country of ref document: ES Kind code of ref document: T3
1996-08-02	PLBE	No opposition filed within time limit	Free format text: ORIGINAL CODE: 0009261
1996-08-02	STAA	Information on the status of an ep patent application or granted ep patent	Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT
1996-09-18	26N	No opposition filed
2000-06-30	PGFP	Annual fee paid to national office [announced via postgrant information from national office to epo]	Ref country code: FR Payment date: 20000630 Year of fee payment: 12
2000-07-12	PGFP	Annual fee paid to national office [announced via postgrant information from national office to epo]	Ref country code: ES Payment date: 20000712 Year of fee payment: 12
2000-09-22	PGFP	Annual fee paid to national office [announced via postgrant information from national office to epo]	Ref country code: DE Payment date: 20000922 Year of fee payment: 12
2001-07-05	PG25	Lapsed in a contracting state [announced via postgrant information from national office to epo]	Ref country code: ES Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20010705
2002-03-29	PG25	Lapsed in a contracting state [announced via postgrant information from national office to epo]	Ref country code: FR Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20020329
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