The propelling drive has a gear sector (21) and a gear train which connects a multi-jaw coupling (42) and a one-way clutch (47).

During the next n-1 jumps of the escapement wheel (12), the gear play is gradually overtaken and the dead second indicator (20) remains stationary.

Each gear set delivers a different input-to-output drive ratio and comprises at least a pair of gears drivingiy coupied to one another.

programming of the periodic worm error and the gear play in right ascension and declination are possible, of course

Each section includes a set of gear teeth.

The set of different gear ratios may include at least ten forward gear ratios and at least one reverse gear ratio.

The gear train is simple, compact, and relatively efficient.

The urging of the scissor gear tooth toward the second gear tooth can close a backlash gap between a first gear tooth of a first gear and the second gear tooth of the second gear.

The gear rim accommodating portion of the holder accommodates the gear rim of the sector gear and has the extra gap of 0.03 to 0.05 mm in the radius direction between the gear rim accommodating portion and the gear rim.

The first and second gear elements inter-engage one another and the arrangement is further provided with an anti-backlash gear which is mounted on one of the gear elements.

The invention relates to an apparatus for reducing backlash in a gear wheel (10).

Another form of the invention comprises a gear wheel for the toy constructional set.

A parasite gearwheel is loosely rotating in the mechanism's body 15.

A gearing system which includes a pair of gears.

The gear rim has internal gear teeth.