摘要 |
The invention relates to a control device for locking and deletion of a plurality of pistons 9, 10, 11 prolonged by pegs 12 sliding in orifices with parallel axes between a high position where the pegs 12 project on a read surface 2 and a low position 11. The pistons are distributed into a matrix. It is characterised in that it comprises, for each piston 9, 10, 11, longitudinal means and transversal means for locking in each of the high and low positions and for the set of the pistons 9, 10, 11, a common chamber 13 into which each orifice 7 of pistons 9, 10, 11 opens out and means for deliberately subjecting the chamber to a pressure and to an underpressure in order to control the movement of the pistons 9, 10, 11. Application to display terminals especially for Braille characters. <IMAGE>
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