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US 5,316,051 AGranted
Self-adjusting thread braking device for weft feeder units
AssigneeL.G.L. Electronics S.p.A.
InventorsPietro Zenoni, Giovanni Pedrini, Rosario Castelli
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AssigneeL.G.L. Electronics S.p.A.
InventorsPietro Zenoni, Giovanni Pedrini, Rosario Castelli
Estimating the term…
The breaking device has a single truncated-cone braking body, supported by an elastic member coaxially and frontally with respect to a drum of a feed unit and is actuated by the elastic member so that it engages, with an elastic contact, against the drum along a circumference thereof which is smaller than the maximum circumference of the drum. The thread slides between the drum and the braking body and extends from a point of contact with the drum and braking body along a path which is inclined with respect to the axis of the drum, so that the tension produced by the braking body has at least one axial component which is discharged onto the braking body and is balanced by the elastic member. Increase in the tension on the thread produces, or tends to produce, by virtue of the corresponding increase in axial component, separation of the braking body from the drum with a corresponding self-adjusting braking action.
A system including a thread braking device and a weft feeder unit of the type comprising at least one drum on which a plurality of turns of a thread constituting a feed reserve are wound, said drum having an axis and a maximum circumference, said thread braking device comprising a braking means which has a continuous circular extension, said braking means being supported by elastic means coaxially and frontally with respect to said drum said braking means being actuated by said elastic means to elastically engage against said drum along an output circumference of said drum which is smaller than said maximum circumference and to exert an elastic force thereon, said thread, as unwound from said drum, running between said drum and said breaking means and extending from said output circumference to a thread guide means disposed substantially at the axis of said drum along a path which is inclined by a preset angle with respect to the axis of said drum, so that the tension produced by said elastic force of said braking means on said thread has at least one axial component which discharges onto the braking means and is balanced by said elastic means, whereat an increase in said tension of the unwound thread causes, as a consequence of a corresponding increase in said at least one axial component of said tension of said braking means, the separation of said braking means from said drum and the corresponding self-adjustment of the braking action.
A system including a weft feeder unit, a thread guide, and, interposed therebetween, a thread braking device, said weft feeder unit comprising at least one drum on which a plurality of turns of a thread constituting a feed reserve are wound, said drum having an axis and a maximum circumference, said thread braking device comprising a braking means which has a continuous circular extension, said braking means being supported by elastic means coaxially and frontally with respect to said rum, said braking means being actuated by said elastic means to elastically engage against said drum along an output circumference of said drum which is smaller than said maximum circumference and to exert an elastic force thereon, said thread, as unwound from said drum, running with an advancement speed between said drum and said braking means and extending from said output circumference to said thread guide disposed substantially at the axis of said drum along a path which is inclined by a preset angle with respect to the axis of said drum, so that the tension produced by said elastic force of said braking means on said thread has at least one axial component which discharges onto the braking means and is balanced by said elastic means, whereat an increase in said tension of the unwound thread, induced by an increase in said advancement speed of the thread, causes, by as a consequence of a corresponding increase in said at least one axial component of said tension of said braking means, the separation of said braking means from said drum and the corresponding self-adjustment of the braking action.
A combination including a thread braking device and at least one weft feeder drum on which a plurality of turns of a thread constituting a feed reserve are wound, said drum having an axis and a maximum circumference, said thread braking device comprising a braking means which has a continuous circular extension, said braking means being supported by elastic means coaxially and frontally with respect to said drum, said braking means being actuated by said elastic means to elastically engage against said drum along an output circumference of said drum which is smaller than said maximum circumference and to exert an elastic force thereon, said thread running, as unwound from said drum, between said drum and said braking means and extending from said output circumference to said thread guide disposed substantially at the axis of said drum along a path which is inclined by a preset angle with respect to the axis of said drum, so that the tension produced by said elastic force of said braking means on said thread has at least one axial component which discharges onto the braking means and is balanced by said elastic means, whereat an increase in said tension of the unwound thread, causes, as a consequence of a corresponding increase in said at least one axial component of said tension of said braking means, the separation of said braking means from said drum and the corresponding self-adjustment of the braking action.
Dependencies are inferred from the claim text.