Abstract: Disclosed are a printer and a stacker and methods. The printer prints selectively on one or both sides of a printable web and sheets or labels are cut from the web and stacked in the stacker. The printer has an unwind mechanism that accepts and holds web rolls of different widths in center-justified relationship with respect to a print head. The printer has a spindle for mounting an ink ribbon core with a detent or latch for center-justifying the ink-ribbon with respect to the print head. A spindle assembly has two latches for counter-justifying a wide range of cores of different widths.

Abstract: A ribbon cassette of the invention accommodates a driving mechanism configured to move an ink ribbon in a length direction using a driving roller and a driven roller, and an ink replenishing mechanism having a roller-shaped ink tank impregnated with ink and a transfer roller that comes into contact with an outer circumference of the ink tank and configured to replenish the ink ribbon with the ink soaked through the ink tank via the transfer roller inside a case. On an outer surface of the case at a portion opposing the ink tank, a tank cover portion is formed to swell in a figure similar to a figure of the ink tank, while an operation knob is disposed with an interval large enough to enable an operation of the knob from an outer circumference of the tank cover portion and linked to the driving roller disposed within the case.