Tachograph for motor vehicles - has visible chart on rotating disc, on which test values are recorded

摘要

In the motor vehicle tachograph a rotating disc has two charge which are placed on top of one another on the disc, with their recording sides on opposite sides, with separate pen and recording mechanism allocated to each chart recording side. The recording mechanism (15, 16) is allocated to one chart (13) which is fixed, and a recording mechanism (17) allocated to the other chart (12) rotates in the same direction as the disc (7), but at twice the speed of the charts (12, 13). The record produced is in the form of a trace on a sector-divided circular arc pre-printed record.