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(12) EUROPEAN PATENT APPLICATION

(43) Date of publication: 06.06.2012 Bulletin 2012/23

(21) Application number: 11191533.6

(22) Date of filing: 01.12.2011

(51) Int Cl.:B65B 13/22 (2006.01)

(84) Designated Contracting States: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TRDesignated Extension States: BA ME

(30) Priority: 02.12.2010 IT MI20102232

(71) Applicant: Officina Meccanica Sestese S.p.A.28040 Paruzzaro (Novarra) (IT)

(72) Inventors: • Maggioni Cesarino

28021 Borgomanero (NOVARA) (IT)• Rossi, Gian Luigi

28041 Arona (NOVARA) (IT)

(74) Representative: Faggioni, Carlo Maria et alFumero Studio Consulenza Brevetti Pettenkoferstrasse 20-2280336 München (DE)

(54) Tension adjustment device in a strapping head and relative strapping machine

(57) An adjustment strap tensioning device in a strap-ping head for a strapping machine is disclosed, of thetype comprising at least a plurality of transmission pulleysapt to impart the launch and recovery of a strap ribbon,actuated by an actuation motor (M), as well as a yieldingsystem moving in opposition to spring means accordingto the tension imparted on the strap by said transmissionpulleys, comprising furthermore a star-shaped wheel(24) the rotation of which is proportional to the displace-

ment of said yielding system moving in opposition to aspring (22), said star-shaped wheel (24) comprising aplurality of equally distanced marks detectable by a sen-sor/transducer (26) apt to issue in correspondence acounting signal of the number of marks detected duringthe rotation of said star-shaped wheel (24), recovery ofsaid strap ribbon performed by said actuation motor (M)being stopped upon reaching a preset threshold of saidcounting signal.

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