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A medium feeding system for a hardcopy apparatus comprising: a revolving arrangement for supporting a roll of medium, the revolving arrangement comprising a friction ring, the friction ring rotating around a friction ring rotation axis; and a braking element comprising two pivotally arranged jaws, whereby the friction ring is bitten by said jaws; whereby the braking element is rotatable around the friction ring rotation axis; and means to push the jaws against the friction ring; and means to pull the jaws away from the friction ring; whereby the means to pull the jaws away from the friction ring are triggered by the rotation of the friction ring.

Titel:	Method of feeding a medium and medium feeding system
Autor/in / Beteiligte Person:	Cano, Emilio ; Cachera, Cristian ; Claramunt, David ; Las Heras, Pedro Luis ; Tua, Marta ; Alonso, Joan
Link:	View record in USPTO Patent Grants (Volltext)
Veröffentlichung:	2007
Medientyp:	Patent
Sonstiges:	Nachgewiesen in: USPTO Patent Grants Sprachen: English Patent Number: 7,287,718 Publication Date: October 30, 2007 Appl. No: 11/117461 Application Filed: April 29, 2005 Assignees: Hewlett-Packard Development Company, L.P. (Houston, TX, US) Claim: 1. A method of feeding a medium to a hardcopy apparatus comprising: providing a revolving arrangement for supporting a roll of medium; applying a braking force producing a friction torque at a friction zone on the revolving arrangement; and varying the value of the braking force as a function of a value of a coefficient of friction at the friction zone. Claim: 2. A method according to claim 1 , whereby a second braking force is provided at a second friction zone on the revolving arrangement, whereby the value of the second braking force varies as a function of the value of the coefficient of friction at the second friction zone. Claim: 3. A method according to claim 2 , whereby a third and a fourth braking force are provided at respectively a third and a fourth friction zone on the revolving arrangement, whereby the value of the third and fourth braking forces vary as a function of the value of the coefficient of friction at the respectively third and fourth friction zone. Claim: 4. A method according to claim 1 , further including the action of rotating a braking element to increase the braking force as the value of the coefficient of friction increases. Claim: 5. A method of feeding a medium to a hardcopy apparatus comprising: providing a revolving arrangement for supporting a roll of medium; applying a variable force producing a friction torque at a friction zone on the revolving arrangement; and reducing the variable force at the zone of friction as a coefficient of friction increases. Claim: 6. A method according to claim 5 , whereby the friction torque is maintained substantially constant while the coefficient of friction varies. Claim: 7. A method according to claim 5 , whereby the friction torque varies between a maximum torque value Tmax and a minimum torque value Tmin, whereby the following equation is respected: (T max− T min)<(0.15× T max+0.15× T min). Claim: 8. A method according to claim 5 , whereby the friction torque varies between a maximum torque value Tmax and a minimum torque value Tmin, whereby the following equation is respected: (T max− T min)<(0.1× T max+0.1× T min). Claim: 9. A medium feeding system for a hardcopy apparatus comprising: a revolving arrangement for supporting a roll of medium; a jaw for applying friction at a zone of friction of the revolving arrangement; means to push the jaw against the revolving arrangement; and means to pull the jaw away from the revolving arrangement wherein the medium feeding system varies a value of a braking force resulting from pushing of the jaw against the revolving arrangement as a function of a value of a coefficient of friction between the jaw and the revolving arrangement. Claim: 10. A medium feeding system according to claim 9 , whereby the means to push the jaw is a mechanical spring. Claim: 11. A medium feeding system according to claim 9 , whereby the revolving arrangement rotates around a rotation axis, and whereby the means to pull the jaw comprise a bar having a first end and a second end, the first end of the bar being pivotally engaged with the jaw and the second end of the bar being pivotally engaged with a base, whereby both pivot engagements are allowing rotation around an axis parallel to the rotation axis of the revolving arrangement. Claim: 12. A medium feeding system according to claim 9 , whereby the revolving arrangement rotates around a rotation axis, and whereby the means to pull the jaw comprise a bar having a first end and a second end, the first end of the bar being pivotally engaged with the jaw and the second end of the bar being pivotally engaged with a base, whereby both pivot engagements are allowing rotation around an axis parallel to the rotation axis of the revolving arrangement, whereby the means to push the jaw is a mechanical spring. Claim: 13. A medium feeding system according to claim 9 , wherein the medium feeding system is configured to push the jaw to contact the revolving arrangement while the revolving arrangement is rotating relative to the jaw. Claim: 14. A medium feeding system for a hardcopy apparatus comprising: a revolving arrangement for supporting a roll of medium, the revolving arrangement comprising a friction ring, the friction ring rotating around a friction ring rotation axis; and a braking element comprising two pivotally arranged jaws, whereby the friction ring is bitten by said jaws; whereby the braking element is rotatable around the friction ring rotation axis. Claim: 15. A medium feeding system according to claim 14 , whereby the rotation of the rotatable braking element is limited to a preset angle. Claim: 16. A medium feeding system according to claim 14 , whereby the system further comprises a fixed abutment and a lever, the lever having a first end, a second end and a lever rotation axis, the lever rotation axis being parallel to the friction ring rotation axis, the rotation axis being fixed relative to a first one of said jaws, the first end of the lever abutting against the second one of said jaws when the second end of the lever abuts against a fixed abutment. Claim: 17. A medium feeding system according to claim 14 , whereby the system further comprises a tensioning element, whereby the two pivotally arranged jaws are linked by the tensioning element. Claim: 18. A medium feeding system according to claim 17 , whereby the tensioning element is a helicoidal spring. Claim: 19. A medium feeding system according to claim 14 , whereby the system further comprises a fixed abutment and a lever, the lever having a first end, a second end and a lever rotation axis, the lever rotation axis being parallel to the friction ring rotation axis, the rotation axis being fixed relative to a first one of said jaws, the first end of the lever abutting against the second one of said jaws when the second end of the lever abuts against a fixed abutment, whereby the system further comprises a tensioning element, whereby the two pivotally arranged jaws are linked by the tensioning element. Claim: 20. A hardcopy apparatus comprising the medium feeding system according to claim 9 . Claim: 21. A large format printer comprising the medium feeding system according to claim 14 . Claim: 22. A medium feeding system for a hardcopy apparatus comprising: a revolving arrangement for supporting a roll of medium, the revolving arrangement comprising a friction ring, the friction ring rotating around a friction ring rotation axis; and a braking element comprising two pivotally arranged jaws, whereby the friction ring is bitten by said jaws; wherein the braking element is rotatable around the friction ring rotation axis; the medium feeding system further comprising: means to push the jaws against the friction ring; and means to pull the jaws away from the friction ring; wherein the means to pull the jaws away from the friction ring are triggered by the rotation of the friction ring. Current U.S. Class: 2424/229 Patent References Cited: 5709481 January 1998 Hinojosa et al. ; 6478489 November 2002 Hierro ; 2002/0102122 August 2002 Hierro Assistant Examiner: Dondero, William E Primary Examiner: Cuomo, Peter M.

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Method of feeding a medium and medium feeding system