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A Flex nib (or flexible nib) is a type of fountain pen nib that can create different line widths. Due to its non-rigid structure, a flex nib allows a writer to control line width by adjusting the pressure of the pen on paper. Increased pressure will cause the two tines of the nib to separate slightly, allowing more ink to flow onto the page.
Many pen movement recording systems capture, not only the x and y coordinates of the pen top, but also axial pen pressure, an x an y tilt or altitude and azimuth of the pen barrel. Handwriting movement measurement systems can capture: x = Horizontal coordinates; parallel to the baseline in Western script
In graphonomics, Axial pen force is the component of the normal pen force that is parallel to the pen. It is dependent upon pen tilt . In the special case of a perfectly vertical orientation of the writing instrument the axial pen force equals the normal pen force .
This page was last edited on 12 April 2007, at 03:12 (UTC).; Text is available under the
There is also a pen movement and pressure smoothing feature which can be manually configured as to how much effect it has. Selection tools include the simple square selection, the lasso, and magic wand, which can be configured for anti-aliasing. There is also a selection brush tool, which can be customized like the drawing brush.
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The nib is a spring-loaded collar that, when depressed as the lead is worn away, extends out again when pressure is released. An advanced ratchet type has a mechanism that rotates the pencil lead 9 degrees counter-clockwise every time the lead is pressed on to the paper (which counts as one stroke), to distribute wear evenly.