Automaatsüstal

Automaatsüstal, also known as a self-loading fountain pen, is a type of fountain pen that allows for refilling of ink without the need for a separate dropper or converter. The mechanism typically involves a piston or a similar internal system that draws ink from a bottle directly into the pen's reservoir when the filling knob is operated. This design makes the pen convenient for frequent users of fountain pens as it simplifies the ink refilling process.

The concept of a self-filling fountain pen has a long history. Early designs often involved a lever mechanism that operated an internal bladder or diaphragm. Modern automatsüstal designs, however, primarily utilize a piston filler system. This system works by rotating a knob, usually located at the end of the barrel, which moves a piston up and down within the ink reservoir. As the piston moves, it creates a vacuum that draws ink into the pen.

Automaatsüstal pens are often favored by those who appreciate the tactile experience of using a fountain pen but desire a more integrated and less messy refilling method than traditional eyedroppers or even cartridge-based systems. The capacity of the ink reservoir in an automatsüstal can vary, but they generally hold a substantial amount of ink, allowing for longer writing sessions between refills. The maintenance of an automatsüstal typically involves occasional flushing with water to clear out old ink and prevent clogging.