Feeding string
AssigneeKimberly-Clark Worldwide, Inc.
InventorGregory J. Rajala
Life of this patent
Estimating the term…
Abstract
Method of and apparatus for feeding string involving entraining the string around two godet rolls and driving one or both rolls in the direction for feeding the string forward. The string entrained around the rolls is tensioned by retarding the string upstream from the rolls with a gas flow and by accelerating the string downstream from the rolls with a gas flow.
Claims32
A method of feeding string forward from a supply, said method comprising:
- entraining the string coming from the supply around at least one feed roll;
- driving said roll in the direction for feeding the string forward;
- subjecting the string to a force in the reverse direction upstream from said roll;
- and
- subjecting the string to a forwarding force downstream from said roll.
A method of feeding string forward from a supply, said method comprising:
- entraining the string coming from the supply around a first roll and then around a second roll;
- positively driving at least one of the rolls in the direction for feeding the string forward;
- subjecting the string to a force in the reverse direction upstream from the first roll;
- and
- subjecting the string to a forwarding force downstream from the second roll, the force in the reverse direction and the force in the forward direction being applied to increase the tension in the string entrained around the rolls.
A method of feeding string forward from a supply, said method comprising:
- entraining the string coming from the supply around a first godet roll and then around a second godet roll in a figure-8 path;
- driving at least one of the rolls cyclically in the direction for feeding a length of string forward on each cycle;
- blowing air in an upstream flow generally surrounding the string upstream from the first godet roll;
- blowing air in a downstream flow generally surrounding the string downstream from the second godet roll;
- the upstream and downstream flows of air subjecting the string to tension as it travels from the upstream flow around the rolls to the downstream flow.
Apparatus for feeding string forward from a supply, said apparatus comprising:
- a feed roll;
- a motor for driving the feed roll in the direction for feeding the string forward;
- a retarder for subjecting the string to force in the reverse direction upstream from said roll for retarding its forward feed;
- and
- an accelerator for subjecting the string to a forwarding force downstream from said roll for exerting a pull on the string to tension the portion of the string between the retarder and the accelerator.
Apparatus for feeding string forward from a supply, said apparatus comprising:
- first and second rolls for entrainment of the string coming from the supply there around, first around the first roll then around the second;
- a motor for driving at least one of the rolls in the direction for feeding the string forward;
- a retarder for subjecting the string to force in the reverse direction upstream from the first roll;
- and
- an accelerator for subjecting the string to a forwarding force downstream from the second roll.
Apparatus for feeding string forward from a supply comprising first and second godet rolls for entrainment of the string coming from a supply first around the first roll and then around the second in a figure 8 path, a motor for driving at least one of the rolls in the direction for feeding the string forward, a retarder for subjecting the string to force in the reverse direction for retarding its forward feed, said retarder comprising a venturi having a passage for the string and an inlet for air under pressure to flow through the passage in an upstream direction, an accelerator for subjecting the string to a forwarding force downstream from the second roll for exerting a pull on the string to tension the portion of the string between the retarder and the accelerator, said accelerator comprising a venturi having a passage for the string and an inlet for air under pressure to flow through the latter passage in a downstream direction.
Dependencies are inferred from the claim text.