Clock timer having a housing (1), a fixed switch (2), a drive mechanism (13) and a freely projecting bearing pin (5) for plugging on a program dial acting on the switch (2) by riders. A spring (6) retains said program dial rotatively and yet latched tight. A driving pinion (13) engages in an outer tooth system of a plugged-on 24-hour program dial, while a pinion (15) connected to the drive pinion (13) via a toothed wheel (16) comes into engagement with the inner tooth system of a plugged-on seven-day program dial. Possible configuration: the spring is provided by a spring wire (6) which is held in cams (7, 8) and latches tight in an incision of the neck of the respectively plugged-on program dial (3). The inner and outer tooth systems engage only with the pinion (13, 15) driving them. IMAGE
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