| 摘要 |
<p>A valve device for matrix printers of the ink jet type. The device is arranged for providing a liquid tight closure and opening of a passage for generating a portion of a character by the output of a certain amount of liquid for character recording through said passage. Armatures, each one having an end portion are arranged as valve bodies in the passages, and means are arranged for operating the armatures in a reciprocating movement for obtaining said closure and opening functions. A plate shaped element is the element wherein the passages are formed and comprises a grindable element, which is such that it is grindable to a smooth condition with long term smoothness and generally free from internal strains. The end portion or valve head of each armature has at least partially a smooth surface arranged for being directly brought into abutment against the smooth grinded element, around the opening of the passage facing the armature. The combined smoothness between the armature end portion and the smooth grinded valve surface around the passage is such that at least a molecular layer of the character recording liquid permanently exists between each end portion and valve seat. In a further embodiment the valve head is connected to the armature by a flexible portion, which allows angle positioning of the valve head relative the longitudinal axis of the armature. This means that under the influence of the spring member, the head may be brought into a parallel abutment against a plate of non-resilient material having ink outlet openings therein.</p> |
