Abstract: Two supporting elements (3) support a section of the driving belt, and a sensor (10) engages the driving belt in the central region between the supporting elements and deflects this belt towards the imaginary connection line between the supporting elements. In order that different thicknesses of driving belts (2) do not falsify the measuring result, the supporting elements (3) are displaceable and are pressed against the driving belt with a force which is larger than the counterforce applied by the sensor (10). Two stationary engagement elements (11) are arranged directly opposite to the supporting elements (3) so that the driving belt (2) is fixed at two places between a supporting element and the associated engagement element.

Abstract: The invention relates to an arrangement for measuring the relative distance of closely adjacent objects, in particular for measuring and adjusting the distance between a printing head and a roller in needle printers, in which the chamber of a distance measuring sensor filled with liquid, which chamber is bounded by a diaphragm-like wall, is reduced in volume by deflection, while a part of the liquid escapes into an ascending conduit visible from the outside. This arrangement can be particularly readily manipulated in that the distance measuring sensor (1) comprises a rigid base layer (4), to which a solid intermediate layer (5) is applied, which has recesses for forming the chamber and the ascending conduit adjoining an opening of the chamber (7), which are closed by the rigid base layer (4) and a rubber-elastic at least partly transparent covering layer (6).