(19)
(11) EP 0 307 125 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
02.05.1990 Bulletin 1990/18

(43) Date of publication A2:
15.03.1989 Bulletin 1989/11

(21) Application number: 88307991.5

(22) Date of filing: 30.08.1988
(51) International Patent Classification (IPC)4: B65H 23/032
(84) Designated Contracting States:
DE FR GB SE

(30) Priority: 08.09.1987 US 95388

(71) Applicant: BAXTER INTERNATIONAL INC. (a Delaware corporation)
Deerfield Illinois 60015 (US)

(72) Inventors:
  • Posey, John L.
    McHenry Illinois 60050 (US)
  • Grude, Frederic L.
    Ringwood Illinois 60072 (US)
  • Woods, Dallas L.
    Marion North Carolina 28752 (US)
  • Hughes, Robert T.
    Crystal Lake Illinois 60012 (US)

(74) Representative: MacGregor, Gordon et al
ERIC POTTER CLARKSON St. Mary's Court St. Mary's Gate
Nottingham, NG1 1LE
Nottingham, NG1 1LE (GB)


(56) References cited: : 
   
       


    (54) Apparatus for tracking a web


    (57) An apparatus and method for automatically tracking a web of film fed through a packaging machine is provided. The apparatus includes a pair of photoelectric sensors (39, 41) located on a lateral side of the apparatus in juxtaposition to a first side (40) of the web of film. A pair of abutment members (43, 45) for abutting a side of the web of film are also provided. The abutment members are located on opposing sides of the web of film. The apparatus includes a member (59) for moving the abutment members in a first lateral direction or a second lateral direction to cause one of the abutment membersto contact a side of the web of film. A control circuit for actuating the member is provided. The photoelectric sensors are coupled to the control circuit and cause the control circuit to actuate the member for moving the abutment means if an edge of the first side of the web of film does not pass between the pair of photoelectric sensors.







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