Ink jet marker recording track of moving object - has oscillating diaphragm of telephone earpiece providing pressure variations to impel ink through capillary

摘要

The ink marker includes a circular plate (1) with a central hole (2). A hollow flexible tube (3) surrounds the plate. The marker itself comprises an ink reservoir (6) comprising a cylinder of plastics material with an internal section tapering towards the bottom where it joins a vertical length of steel capillary tube (8) with an external diameter of 0.7mm. The tube projects about 0.25mm below the plate. The reservoir is covered by a disc (12) pierced by a hole through which a tube (13) fits. A telephone earpiece (9) fits over this disc, with its electromagnet acting on a membrane.