(19)
(11) EP 0 411 542 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
22.05.1991 Bulletin 1991/21

(43) Date of publication A2:
06.02.1991 Bulletin 1991/06

(21) Application number: 90114603.5

(22) Date of filing: 30.07.1990
(51) International Patent Classification (IPC)5: H01L 1/04, H01C 3/18, H05B 3/16
(84) Designated Contracting States:
AT BE CH DE DK ES FR GB GR IT LI NL SE

(30) Priority: 02.08.1989 IT 2142889

(71) Applicant: Roggia, Francesco
I-20062 Cassano d'Adda (Milano) (IT)

(72) Inventor:
  • Roggia, Francesco
    I-20062 Cassano d'Adda (Milano) (IT)

(74) Representative: Marietti, Giuseppe 
MARIETTI e GISLON S.r.l. Via Larga, 16
I-20122 Milano
I-20122 Milano (IT)


(56) References cited: : 
   
       


    (54) Process and apparatus for producing spiral resistors


    (57) A process for producing spiral electrical resistors, comprises the steps of: winding a preset length of resistive wire (4) with a presettable pitch around a swift (1) having adjustable width to obtain a plurality of turns; blocking in position said turns on at least part (1a) of said swift; reducing the width of said swift; engaging at least some of said turns with at least an electrically insulating support (19; 23); releasing said turns from said swift; withdrawing the resistor (18; 20) thus obtained from the swift having reduced width; and repeating said steps, restoring the original width of the swift before winding the subsequent length of wire.







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