EP1178120A2 - Dispositif pour la fixation amovible des objets plats tels que les peaux ou similaires sur une surface de travail - Google Patents

Dispositif pour la fixation amovible des objets plats tels que les peaux ou similaires sur une surface de travail Download PDF

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Publication number
EP1178120A2
EP1178120A2 EP01114830A EP01114830A EP1178120A2 EP 1178120 A2 EP1178120 A2 EP 1178120A2 EP 01114830 A EP01114830 A EP 01114830A EP 01114830 A EP01114830 A EP 01114830A EP 1178120 A2 EP1178120 A2 EP 1178120A2
Authority
EP
European Patent Office
Prior art keywords
motor
detecting
sensor
work surface
flow regulator
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
EP01114830A
Other languages
German (de)
English (en)
Other versions
EP1178120A3 (fr
EP1178120B1 (fr
Inventor
Gianni Gallucci
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.)
Teseo SpA
Original Assignee
Teseo SpA
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
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Application filed by Teseo SpA filed Critical Teseo SpA
Publication of EP1178120A2 publication Critical patent/EP1178120A2/fr
Publication of EP1178120A3 publication Critical patent/EP1178120A3/fr
Application granted granted Critical
Publication of EP1178120B1 publication Critical patent/EP1178120B1/fr
Anticipated expiration legal-status Critical
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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
    • C14B17/00—Details of apparatus or machines for manufacturing or treating skins, hides, leather, or furs
    • C14B17/06—Work feeding or clamping devices
    • 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
    • C14B17/00—Details of apparatus or machines for manufacturing or treating skins, hides, leather, or furs
    • C14B17/04—Work-supports or other counter-pressing elements; Bed rolls or counter-pressing rolls

Definitions

  • the present invention relates to working of flat articles like leathers and similar.
  • the present invention relates to an apparatus for fastening the above articles to a work surface so that they do not move during processing steps.
  • substantially flat articles like leathers and similar are usually subjected to cutting, drilling, die cutting and other operations.
  • the articles to be worked are usually fastened removably to a suitable work surface.
  • the article is firmly kept on the work surface when the suction source is operated..
  • the work surface should be preferably as big as possible, so as to contain also those articles to be worked having large dimension.
  • the suction means Since to be effective, the suction means must perform their action on the whole working area, if the article does not cover the entire surface, operation of the suction means does not give the best effect.
  • the suction means are considerably oversized, so that their action is not affected by non-effective operation determined in those areas of the work surface, which are connected to the vacuum source but not covered by the article and which are, consequently, in direct contact with the open environment.
  • the work surface is divided into a series of different elements, formed by square plates, situated one beside another.
  • Each plate has a cavity, set separately in communication with the suction source by respective aspiration channels.
  • Each aspiration channel includes a valve, operated selectively to set under vacuum only the areas covered by the article to be worked.
  • the shape of the article to be worked is detected by suitable sensor means, which can include a camera connected to a processor and a shape recognising program stored in the processor.
  • valves for setting under vacuum the single cavities of the work surface are bistable, i.e. are capable of assuming only two stable configurations, open and closed, respectively, which does not allow to modulate the vacuum level in the single elements of the work surface.
  • the perimetral active elements i.e. those elements on which the edges of the article to be worked are placed, are usually only partially covered by the article.
  • the most effective solution for fixing the leather articles also considering the dimensions of the suction means, consists in applying a vacuum of bigger value to the article edges, and a vacuum of smaller value to the inner parts thereof.
  • the main object of the present invention is to propose an apparatus for removable fastening of an article to be worked to a relative work surface, which can change the intensity of vacuum in each single element, or group of elements of the work surface.
  • Another object of the present invention is to propose an apparatus with a work surface applying a vacuum with possibility to change the intensity in a simple, reliable and particularly cheap way.
  • the reference numeral 1 indicates a work surface, integral with the proposed apparatus.
  • the work surface 1 supports an article 2 to be worked, e.g. a piece of leather to be cut or drilled.
  • the work surface 1 is divided into a series of fastening elements 3, arranged one beside another and covering the whole surface thereof.
  • the fastening elements 3 can be connected selectively, and especially singularly, to known suction means, not shown for sake of simplicity.
  • each fastening element 3 has a cavity 4 open to outside ( Figure 3).
  • each cavity 4 is singularly set in communication with the above suction means by a communication channel 5.
  • Valve means 10 situated within the communication channel 5, are operated by a control unit, to selectively set under a vacuum the cavities 4 of the fastening elements 3, which are covered by the article 2 at least partially.
  • valve means 10 include a flow regulator 11, situated within the communication channel 5, substantially including a throttle valve 12.
  • the throttle valve 12 can assume, in a substantial continuous way, a plurality of intermediate positions C, included between two extreme positions, namely an open position A and a closed position B, respectively.
  • the throttle valve 12 is operated by progressive operating means 20, to assume one of the above operative positions, on command of a control unit 90.
  • the control unit 90 is a substantially known element of the proposed apparatus, and usually includes an electronic device for data acquiring and processing, a series of connection and control interfaces, as well as programs suitably designed on purpose.
  • the above mentioned progressive operating means 20 include a simple, direct current electric motor 21, whose power is sufficient to operate the throttle valve 12.
  • the rotation direction of the motor 21 is determined by the polarity of its supplied continuous voltage Vcc and thus the motor can rotate in both rotation directions by simple polarity inversion.
  • Power transmission means 22 are situated between the throttle valve 12 and the motor 21.
  • the transmission means include a worm screw 26, fastened at the head of the shaft of the motor 21 and engaging with a toothed wheel 27, which is keyed to the rotation axis of the throttle valve 12.
  • the progressive actuating means 20 include also sensor means 23 for the motor 21 rotation.
  • the sensor means 23 include a sensor 23a for detecting a difference Vh, VI of the motor 21 supply voltage Vcc with respect to a nominal supply voltage Vn.
  • the sensor 23a is connected electrically to the above mentioned control unit 90 to send thereto a signal indicating that a difference has occurred.
  • Figure 4 shows a diagram of the trend of the supply voltage Vcc at the input of the motor 21 with respect to the time t, referring to motor different operation conditions.
  • the supply voltage Vcc is near to the 0 if the motor 21 is not operated (t ⁇ t0 and t>t2).
  • the motor 21 rotates and the supply voltage Vcc oscillates, around the nominal value Vn, between a maximum value Vh and a minimum value VI.
  • the motor 21 is operated, but is stopped, since it is prevented from rotating because the throttle valve 12 has reached one of the limit positions A, B.
  • the supply voltage has a stable value, substantially coincident with the nominal voltage value Vn.
  • duration of the periods t0-t1 and t1-t2 has been chosen arbitrarily, as a mere example.
  • the sensor 23a detects only one variation Vh, VI.
  • the frequency of the variation of the tension Vcc during one rotation of the motor 21 indicates the motor relative angular position.
  • the progressive operating means 20 of the throttle valve 12 include also means 24 for detecting at least one extreme position A, B of the throttle valve 12.
  • the detecting means 24 include a detector 24a of current I, aimed at detecting variations Ib of current I flowing through the motor 21 with respect to nominal current In ( Figure 5).
  • the detector 24a is connected electrically with the above mentioned control unit 90, to send thereto a signal indicating the above variations.
  • Figure 5 is a diagram of the trend of the current I flowing through the motor 21 in relation to the time t, in different operation conditions thereof.
  • This change can be easily recognised and signalled to the control unit 90, e.g. by a simple electronic circuit of known configuration, including operational amplifiers.
  • the leather 2 covers a part of the work surface 1, and especially the perimetral areas of the leather occupy only partially some of the fastening elements 3.
  • suction means are deactivated and the control unit 90 does not feed the motors 21 for operating throttle valves 12 present in each fastening element 3.
  • the leather 2 position and shape are detected using known techniques, and on this basis, the fastening elements 3 wholly or partially covered by the leather 2 are recognised.
  • control unit 90 commands a sequence of leather fastening operations for each fastening element 3.
  • the sequences are different for completely free fastening elements 3, partially covered and wholly covered by the leather.
  • control unit 90 operates the relative motor 21 in the direction of the throttle valve 12 closing, until the throttle valve reaches its closed position B.
  • the current sensor 24a recognises the increase of the flowing current I and the control unit 90 stops the motor 21.
  • control unit 90 operates the motor 21, until the throttle valve 12 reaches an extreme position, e.g. closing position B, which is detected, as already described above, by the current sensor 24a.
  • the voltage sensor 23a detects the variations Vh, VI of the supply voltage Vcc.
  • the number of variations indicates the relative angular position of the motor 21 and sends information about the present position of the throttle valve 12 to the control unit 90.
  • control unit 90 stops the motor 21 when the throttle valve 12 reaches an intermediate position C, in which it partially closes the communication channel 5.
  • the partial closure of the communication channel 5 reduces the action of the suction means on the cavity 4 of the relative fastening element, and consequently, the obtained vacuum is less effective than the vacuum obtained with the open throttle valve 12.
  • a weak vacuum action in the inner areas of the leather 2 is advantageous, because it avoids leather deformations and keeps the power necessary for the suction means to keepthe leather fastened at the minimum.
  • the necessary vacuum level can be calculated empirically, and its value can be stored e.g. by suitable memory tables in the control unit 90.
  • fastening sequence is quite similar to the one described for the wholly covered elements 3.
  • the relative motor 21 is stopped, when the throttle valve 12 is in the wholly open position A or in an intermediate position C, different from the previously mentioned one, corresponding to a more open position of the throttle valve 12.
  • the exact position of the throttle valve 12 stop depends on the percent of the fastening element 3 surface not covered by the leather 2.
  • the throttle valve 12 stops in a more open position, which corresponds to stronger suction action on the fastening element.
  • suction means do not have to be oversized to compensate for vacuum effect losses and best use is made thereof constantly. This reduces the suction means production and maintenance costs.
  • a further advantage derives from the fact that the operative feeding power necessary for the suction means can be reduced, which results in reduction of the whole apparatus handling costs.

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)
  • Manipulator (AREA)
  • Feeding Of Articles By Means Other Than Belts Or Rollers (AREA)
  • Purses, Travelling Bags, Baskets, Or Suitcases (AREA)
  • Details Of Garments (AREA)
  • Clamps And Clips (AREA)
EP01114830A 2000-07-04 2001-06-28 Dispositif pour la fixation amovible des objets plats tels que les peaux ou similaires sur une surface de travail Expired - Lifetime EP1178120B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT2000BO000393A ITBO20000393A1 (it) 2000-07-04 2000-07-04 Apparecchiatura per il bloccaggio amovibile ad un piano di lavoro di articoli a sviluppo piano , quali pelli e similari .
ITBO000393 2000-07-04

Publications (3)

Publication Number Publication Date
EP1178120A2 true EP1178120A2 (fr) 2002-02-06
EP1178120A3 EP1178120A3 (fr) 2003-05-14
EP1178120B1 EP1178120B1 (fr) 2006-08-09

Family

ID=11438585

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01114830A Expired - Lifetime EP1178120B1 (fr) 2000-07-04 2001-06-28 Dispositif pour la fixation amovible des objets plats tels que les peaux ou similaires sur une surface de travail

Country Status (5)

Country Link
EP (1) EP1178120B1 (fr)
AT (1) ATE335856T1 (fr)
DE (1) DE60122068D1 (fr)
ES (1) ES2270925T3 (fr)
IT (1) ITBO20000393A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006090252A1 (fr) * 2005-02-25 2006-08-31 Teseo S.P.A. Table de travail pour machine automatique de decoupe de cuirs et analogues
EP4215626A1 (fr) * 2022-01-19 2023-07-26 Costruzioni Meccaniche Persico S.r.l. Machine pour le traitement des peaux

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0566817A1 (fr) * 1992-04-21 1993-10-27 GFM Gesellschaft für Fertigungstechnik und Maschinenbau Aktiengesellschaft Procédé et table de découpe pour couper des matériaux pouvant former des plis, en particulier le cuir
DE19521616C1 (de) * 1995-06-14 1997-07-17 Felber Peter Verfahren zur Bedienung eines Arbeitstisches einer Schneideinrichtung und Arbeitstisch zur Durchführung dieses Verfahrens
US5953232A (en) * 1996-04-02 1999-09-14 Gfm Gmbh Method of cutting out blanks from, irregular workpieces of sheet material

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0566817A1 (fr) * 1992-04-21 1993-10-27 GFM Gesellschaft für Fertigungstechnik und Maschinenbau Aktiengesellschaft Procédé et table de découpe pour couper des matériaux pouvant former des plis, en particulier le cuir
DE19521616C1 (de) * 1995-06-14 1997-07-17 Felber Peter Verfahren zur Bedienung eines Arbeitstisches einer Schneideinrichtung und Arbeitstisch zur Durchführung dieses Verfahrens
US5953232A (en) * 1996-04-02 1999-09-14 Gfm Gmbh Method of cutting out blanks from, irregular workpieces of sheet material

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006090252A1 (fr) * 2005-02-25 2006-08-31 Teseo S.P.A. Table de travail pour machine automatique de decoupe de cuirs et analogues
US7726159B2 (en) 2005-02-25 2010-06-01 Teseo S.P.A. Work table for an automatic machine for cutting leathers and the like
EP4215626A1 (fr) * 2022-01-19 2023-07-26 Costruzioni Meccaniche Persico S.r.l. Machine pour le traitement des peaux

Also Published As

Publication number Publication date
ITBO20000393A0 (it) 2000-07-04
EP1178120A3 (fr) 2003-05-14
ATE335856T1 (de) 2006-09-15
EP1178120B1 (fr) 2006-08-09
ITBO20000393A1 (it) 2002-01-04
ES2270925T3 (es) 2007-04-16
DE60122068D1 (de) 2006-09-21

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