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An apparatus for driving and tensioning a ribbon includes a supply spindle for supplying a ribbon, a supply dancer assembly for applying tension to the ribbon, a printhead, a take-up dancer assembly for applying tension to the ribbon, and a take-up spindle for collecting spent ribbon. The supply dan

An apparatus for driving and tensioning a ribbon includes a supply spindle for supplying a ribbon, a supply dancer assembly for applying tension to the ribbon, a printhead, a take-up dancer assembly for applying tension to the ribbon, and a take-up spindle for collecting spent ribbon. The supply dancer assembly is positioned downstream of the supply spindle. The printhead is positioned downstream of the supply dancer assembly. The take-up dancer assembly is downstream of the printhead. The take-up spindle is downstream of the take-up dancer assembly.

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The invention claimed is: 1. An apparatus for tensioning a medium comprising: a supply assembly for supplying a medium; a first dancer assembly for applying tension to the medium, said first dancer assembly being disposed downstream of said supply assembly, said first dancer assembly including a sp

The invention claimed is: 1. An apparatus for tensioning a medium comprising: a supply assembly for supplying a medium; a first dancer assembly for applying tension to the medium, said first dancer assembly being disposed downstream of said supply assembly, said first dancer assembly including a spring-biased first dancing arm and a first channel, a first portion of the first dancing arm being capable of moving in and out of the first channel; a take-up assembly for taking up the medium, said take-up assembly disposed downstream of said first dancer assembly; a housing on which said first dancer assembly is mounted; and a second dancer assembly for applying tension to the medium, said second dancer assembly including a spring-biased second dancing arm mounted on said housing. 2. An apparatus according to claim 1, further comprising a printhead disposed downstream of said first dancer assembly. 3. An apparatus according to claim 1, further comprising a second dancer assembly for applying tension to the medium, said second dancer assembly being positioned downstream of said first dancer assembly, said second dancer assembly including a spring-biased second dancing arm and a second channel, a portion of the second dancing arm being capable of moving in and out of the second channel. 4. An apparatus according to claim 1 further comprising a printhead disposed upstream of said first dancer assembly. 5. An apparatus according to claim 1, wherein said first dancer assembly comprises a first idler roller, and a second idler roller, wherein the first portion of the first dancing arm is capable of extending between the first idler roller and the second idler roller. 6. An apparatus according to claim 5, further comprising a third roller rotatably mounted on the first portion of the first dancing arm. 7. An apparatus according to claim 6, wherein the first idler roller, the third roller, and the second idler roller define a generally U-shaped path for the medium. 8. An apparatus according to claim 7, wherein a linear first portion of the U-shaped path is defined between the first idler roller and the third roller, wherein a linear second portion of the U-shaped path is defined between the third roller and the second idler roller, and wherein the first portion of the U-shaped path is approximately parallel to the second portion of the U-shaped path. 9. An apparatus according to claim 1 further comprising a position sensor operable to sense the disposition of the first dancing arm relative to the first channel. 10. An apparatus for tensioning a medium comprising: a supply assembly for supplying a medium; a dancer assembly for applying tension to the medium, said dancer assembly being disposed downstream of said supply assembly, said dancer assembly including a spring-biased dancing arm and a channel, a portion of the dancing arm being capable of moving in and out of the channel; a take-up assembly for taking up the medium, said take-up assembly disposed downstream of said dancer assembly; a position sensor operable to sense the disposition of the dancing arm relative to the channel; and a motor coupled to one of said supply assembly and said take-up assembly, wherein said motor, based on input from said position sensor, controls said supply assembly or said take-up assembly. 11. A tensioning apparatus for tensioning a medium in a printing system, the printing system defining a path for a medium to travel in a downstream direction, the tensioning apparatus disposed in the path, the tensioning apparatus comprising: a housing; a first idler roller rotatably attached to said housing; a second idler roller rotatably attached to said housing, said second idler roller disposed downstream of said first idler roller; and a dancing arm comprising a proximal portion pivotally attached to said housing and a distal portion attached to the proximal portion, the distal portion movably disposed downstream of said first idler roller and upstream of said second idler roller such that a loop path for the medium is defined about the distal portion; wherein the loop path has a path length between the first idler roller and the second idler roller; wherein the proximal portion of said dancing arm is capable of pivoting toward said first roller and said second roller; wherein the distal portion of said dancing arm moves when the proximal portion pivots toward said first roller and said second roller such the path length of the loop path increases. 12. A tensioning apparatus according to claim 11, wherein the loop path is a generally U-shaped path. 13. A tensioning apparatus according to claim 11, wherein the loop path is a generally V-shaped path. 14. A tensioning apparatus according to claim 11, wherein the loop path has a first linear portion between the first idler roller and the distal portion of said dancing arm, and wherein the loop path has second linear portion between the distal portion of said dancing arm and the second idler roller such that the first linear portion is parallel to the second linear portion. 15. A tensioning apparatus according to claim 14, wherein the first linear portion of the loop path has a first length, and wherein the second linear portion of the loop path has a second length that is approximately the same as the first length. 16. A tensioning apparatus according to claim 11, wherein the distal portion of the dancing arm is movably disposed between the first idler roller and the second idler roller. 17. A tensioning apparatus according to claim 11, said dancing arm further comprising a third roller rotatably mounted on the distal portion of said dancing arm. 18. A tensioning apparatus according to claim 17, wherein the third roller is approximately equidistant from the first idler roller and the second idler roller. 19. A tensioning apparatus according to claim 17, further comprising a medium having a first surface and a second surface opposing the first surface, the first surface contacting the first idler roller and the second idler roller, and the second surface contacting the third roller. 20. A printer defining a path for a medium to travel in a downstream direction, the printer comprising: a supply assembly; a medium extending from said supply assembly, said medium having a first surface and an opposing second surface; and a tensioning assembly downstream of said supply assembly, said tensioning assembly receiving said medium from said supply assembly, said tensioning assembly comprising a first idler roller contacting the first surface of said medium, a movable roller contacting the second surface of said medium downstream of the first idler roller, a second idler roller contacting the first surface of said medium downstream of the movable roller, and a generally U-shaped dancing arm on which the movable roller is rotatably mounted. 21. A printer according to claim 20, wherein the dancing arm comprises portions that are not co-linear with each other. 22. A printer according to claim 20, wherein the dancing arm comprises a first portion and a second portion, wherein the first portion is biased to pivot toward the first idler roller and the second idler roller, and wherein the second portion is attached to the first portion such that the second portion extends between the first idler roller and the second idler roller when the first portion pivots toward the first idler roller and the second idler roller. 23. A printer according to claim 22, said tensioning assembly further comprising a torsion spring biasing the first portion of the dancing arm to pivot toward the first idler roller and the second idler roller. 24. A printer according to claim 23, said tensioning assembly further comprising a shaft, wherein the dancing arm is pivotally mounted on the shaft, and wherein the torsion spring is mounted on the shaft. 25. A printer according to claim 20, wherein the dancing arm comprises a portion movably disposed between the first idler roller and the second idler roller, wherein the movable roller is rotatably mounted on the portion of the dancing arm. 26. A printer according to claim 20, said tensioning assembly further comprising a position sensor that senses the position of the dancing arm. 27. A printer according to claim 20, wherein the first idler roller, the second idler roller, and the movable roller are essentially parallel. 28. A printer according to claim 20, wherein a first linear portion of the medium is disposed between the first idler roller and the movable roller, and wherein a second linear portion of the medium is disposed between the movable roller and the second idler roller such that the first linear portion is essentially parallel to the second linear portion. 29. A printer according to claim 28, wherein the movable roller is approximately equidistant from the first idler roller and the second idler roller. 30. A printer according to claim 20, further comprising: a head assembly disposed downstream of said tensioning assembly; a second tensioning assembly disposed downstream of said head assembly, said second tensioning assembly comprising a first idler roller contacting said medium, a movable roller contacting said medium downstream of said first idler roller, and a second idler roller contacting said medium downstream of the movable roller. 31. A printer according to claim 30, wherein said head assembly comprises a printhead assembly.