Yarn brake
AssigneeIropa AG
InventorsKurt Arne Gunnar Jacobsson, Per Ohlson, Fiorenzo Ghiardo, Andrea Maffeo
Life of this patent
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Abstract
The invention concerns a yarn brake (B) comprising a brake (L) electromagnetically stressed against a fixed braking surface (17), a housing (1) whereon the cover bearing the brake (L) is mounted such that it is capable of being lifted relative to the fixed braking surface (17), and at least an adjusting arbor (S) controlling the lifting movements of the cover, said arbor being mounted on the housing (S) in geometric association to the path of the yarn (W). The invention is characterised in that the cover is a flap cover (K) mounted so as to be capable of being lifted about the adjusting arbor (S) for completely clearing the braking zone (12) of the yarn tension device (B).
Claims30
Yarn brake for a weaving machine, comprising:
- a braking lamella which is actuable at least electromagnetically against a fixed braking surface;
- a housing supporting the fixed braking surface and containing at least one solenoid;
- a cover carrying the braking lamella, which cover can be lifted from a closed position relative to the fixed braking surface;
- and
- at least one adjusting arbor for controlling lifting movements of the cover, which adjusting arbor is provided at the housing in geometric association to a yarn run path through the yarn brake, wherein the cover is a flap cover which is cantilevered freely at one side, the flap cover being tiltable into an opened position about the adjusting arbor for completely clearing a braking zone of the yarn brake and consisting of non-magnetic material like light metal or plastic.
Yarn brake for a weaving machine, comprising:
- a braking lamella which is actuable at least electromagnetically against a fixed braking surface;
- a housing supporting the fixed braking surface and containing at least one solenoid;
- a cover carrying the braking lamella, which cover can be lifted from a closed position relative to the fixed braking surface;
- at least one adjusting arbor for controlling lifting movements of the cover, the adjusting arbor being provided at the housing in geometric association to a yarn run path through the yarn brake, the cover being a flap cover which is cantilevered freely at one side, the flap cover being tiltable into an open position about the adjusting arbor for completely clearing a braking zone of the yarn brake;
- and
- at least one cleaning nozzle for selectively actuating the braking zone by pressurized air, the cleaning nozzle being connected to a pressure supply, an exit portion of the cleaning nozzle being provided close to a longitudinal edge region of the braking zone between the fixed braking surface and the braking lamella, the exit portion being shielded downstream of the nozzle by a throttling gap, and the throttling gap being bound by a surface of a wall which extends substantially perpendicular to the fixed braking surface, and by the braking lamella.
Method for cleaning a yarn brake by means of a pressurized air cleaning device, the yarn brake comprising a braking surface and a braking lamella which is resiliently pressed against the braking surface, the braking surface and the braking lamella commonly forming a braking zone for an intermittently running yarn, the braking lamella being selectively and forcefully pressed by magnet force actuation against the braking surface, the method comprising the steps of:
- blowing pressurized air only into the braking zone when the braking lamella is magnetically deactivated;
- and
- blowing the pressurized air into an exit side of the yarn brake essentially counter to a yarn run direction, the exit side of the yarn brake divergently opening in the yarn run direction.
Dependencies are inferred from the claim text.