13. A document bundler for a bill validator, the document bundler comprising: a pushing member having a first pushing surface and a second surface opposite the first pushing surface; and an extendable arm connected to the pushing member and rotatable through a first trajectory from a retracted position to an extended position, the first trajectory passing the pushing member from the retracted position through at least a portion of a document path to press, in the extended position, the first pushing surface of the pushing member against a first document residing within the document path, the extendable arm adapted to inhibit movement of the first document residing within the document path when in the extended position, and the extendable arm rotatable through a second trajectory along a different path from the first trajectory from the extended position to the retracted position.
13. A document bundler for a bill validator, the document bundler comprising: a pushing member having a first pushing surface and a second surface opposite the first pushing surface; and an extendable arm connected to the pushing member and rotatable through a first trajectory from a retracted position to an extended position, the first trajectory passing the pushing member from the retracted position through at least a portion of a document path to press, in the extended position, the first pushing surface of the pushing member against a first document residing within the document path, the extendable arm adapted to inhibit movement of the first document residing within the document path when in the extended position, and the extendable arm rotatable through a second trajectory along a different path from the first trajectory from the extended position to the retracted position. 16. The document bundler of claim 13 , wherein the first pushing surface has a coefficient of friction that is greater than a coefficient of friction of the second surface.