Print Media Detection Lever Geometry to Prevent Edge Damage

The detection lever is designed with asymmetric geometry where the contact point between the lever and printing medium is positioned at a specific location that is offset from the rotation axis. This asymmetric arrangement ensures that during rotation in the insertion direction, the lever contacts the medium at the appropriate position for detection, while during return rotation, the lever rotates without digging into the medium, preventing damage.

The solution introduces a dimensional relationship between the contact point and rotation axis that creates a geometric advantage. By positioning the contact point at a specific distance and angle from the rotation axis, the system achieves reliable detection while preventing harmful contact during return movement, effectively using spatial geometry to resolve the contradiction.

The detection lever employs asymmetric design where the contact point is deliberately positioned offset from the rotation axis. This asymmetric configuration allows the lever to contact the printing medium effectively during insertion for detection purposes, while the same geometric arrangement ensures that during return movement, the lever rotates without applying digging forces to the medium, thus preserving its integrity.

The geometric configuration is pre-designed to establish the correct relationship between the contact point and rotation axis before operation begins. This preliminary geometric setup ensures that during subsequent insertion and return movements, the lever naturally follows a path that enables detection while avoiding harmful contact, eliminating the need for additional control mechanisms.