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US 5,014,756 AGranted
Pile warp tension control in a loom
AssigneeSulzer Brothers Limited
InventorsRudolf Vogel, Anton Ruedisueli
Life of this patent
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Abstract
To operate the loom, one or more warp-tensioning elements is or are actuated by separate drives on an individual pick basis with free triggering and at loom speed. The warp tension can therefore be so modulated as to obviate deleterious tension peaks and warp breakages and overflow tensions. The loom has at least one servomotor. A servomotor, which is triggered by a control and adjustment circuit arrangement, drives the warp-tensioning element by way of a reduction transmission and transmission elements. The servomotor can be commutated preferably brushlessly and electronically and have a low mass inertia rotor and high-field-strength permanent magnets.
Claims26
A loom comprising
- at least one warp-tensioning element for moving into a path of warp yarns extending to and forming at least a top shed to deflect the warp yarns therefrom into a tensioned state;
- a servomotor;
- transmission means coupling said servomotor to said element for movement of said element into said path in response to selective operation of said servomotor;
- and
- a circuit arrangement having a control connected to said servomotor for driving said servomotor to effect movement of said element and a control input connected to said control to deliver programmable signals to said control for actuating said servomotor to adjust the tension in said yarns of said top shed within a predetermined range.
2 more elements
A loom comprising
- a warp tensioning element for moving into a path of warp yarns upstream of a shed of the warp yarns relative to yarn movement to deflect the warp yarns into a tensioned state;
- a servomotor for deriving said element;
- means coupling said servomotor to said element for movement of said element into said path;
- a detector for detecting the tension in the warp yarns upstream of the shed and generating a signal in response thereto;
- and
- a tension control for receiving said signal for actuating said servomotor in a periodic manner adapted to loom cycles to adjust the tension in the warp yarns into a predetermined range.
3 more elements
A method of controlling warp tension in a loom comprising the steps of
- passing a plurality of warp yarns through a predetermined path from a warp beam to a cloth beam in a loom;
- shedding the warp yarns between the warp beam and cloth beam into a top shed and a bottom shed during at least one cycle of the loom while increasing the tension in at least the yarns forming the top shed between the warp beam and the cloth beam;
- detecting the tension in at least the yarns forming the top shed at a location upstream of the sheds relative to the movement of the yarns;
- and
- selectively deflecting at least the yarns forming the top shed from said path at a location upstream of the shed during said loom cycle in dependence on the detected tension to adjust the tension in the top shed into a predetermined range.
2 more elements
A method of operating a loom comprising the steps of
- passing a plurality of warp yarns through a predetermined path form a warp beam to a cloth beam;
- shedding the warp yarns between the warp beam and the cloth beam into a top shed and a bottom shed during at least one loom cycle while increasing the tension in at least the yarns forming the top shed;
- detecting the tension in at least the yarns forming the top shed in said path upstream of the top shed relative to the movement of the yarns;
- and
- directing a deflecting element into said path to deflect at least the yarns forming said top shed in response to the detected tension to adjust the tension in the yarns forming the top shed into a predetermined range.
2 more elements
A method of operating a loom comprising the steps of
- passing a plurality of warp yarns through a predetermined path from a warp beam to a cloth beam;
- shedding the warp yarns between the warp beam and the cloth beam into a top shed and a bottom shed during at least one loom cycle while increasing the tension in at least the yarns forming the top shed;
- detecting the tension in the warp yarns upstream of the sheds relative to the movement of the yarns;
- and
- deflecting all the yarns from said path in response to the detected tension to adjust the tension in the yarns into a predetermined range during said shedding step.
2 more elements
A loom comprising
- a warp beam for delivering warp yarns into a predetermined yarn path;
- a cloth beam for receiving cloth;
- a whip roll in said path downstream of said warp beam relative to the direction of warp movement for maintaining tension in the warp yarns;
- heald frames in said path for shedding the warp yarns into a top shed and a bottom shed for formation of a cloth;
- a tension detector in said path for detecting the tension in the warps during shedding and generating a signal in response thereto;
- and
- a warp tensioning control for varying the tension in the yarns during shedding in response to said signal to adjust the tension in the yarns into a predetermined range during shedding.
4 more elements
Dependencies are inferred from the claim text.