Pressing roller testing apparatus for printer

A pressing roller testing apparatus for testing a duplexer module of a printer comprising:

• a base configured to support the duplexer module on the base;
• a paper pressing roller configured to be fixed on the duplexer module;
• and
• a resisting module fixed on the base;
• wherein the resisting module comprising:
• a rotating axis;
• a rotating wheel mounted on the rotating axis;
• a pressure detecting unit mounted on the rotating wheel;
• a supporting block mounted on the rotating wheel;
• and
• a resisting block connected to the pressure detecting unit and the supporting block;
• wherein a top surface of the resisting block contacts the paper pressing roller;
• a bottom surface of the resisting block contacts the pressure detecting unit;
• when the rotating axis is rotated and the resisting block resists against the paper pressing roller, the paper pressing roller generates an elastic counterforce on the pressure detecting unit by the resisting block, and the pressure detecting unit detects and outputs a value of the counterforce.