A round or strip chart recorder preferably of the self-balancing type for recording and indicating the values of a plurality of measured quantities. This recorder is characterized by a plurality of stacked recording modules each comprised of a pivoted frame including a pair of side plates or arms secured in parallel spaced relation by support shafts which also serve as guide rods for a marker carriage assembly. The frame supports a scale, motor and drive means for the marker carriage, and a marker carriage assembly supporting a marker and index. In a preferred embodiment the recorder is an automatic self-balancing strip chart recorder employing a plurality of pivoted recording modules having capillary pens. Each recording module will additionally include one or more slidewire assemblies and a tray for support of a flexible capillary tube. The use of hinged recording modules provides access for servicing without unplugging or disassembly of any recording module. Each recording module may be disconnected for elimination or replacement of the module without unplugging or disassembly. Additionally, depending upon the number of pairs of pivot points provided in the recorder main frame structure, a recorder is readily assembled or later modified in a manner to include a larger or smaller number of recording modules.
A rotatable scale arrangement for strip chart recorders and the like for providing access to recorder writing elements from the front of the instrument. A mechanism is provided for simultaneously rotating each of a plurality of elongated flat strips, adapted to include scale markings, from a position facing the front of the recorder to a position normal thereto, wherein a substantially wider separation is provided between the strips for removal or insertion of the writing elements.
