To restrict the abrasion of a movable part to the minimum while improving the lubricating condition of a driving unit of a device by supplying grease every predetermined operation interval at the predetermined number of times.

A cycle number comparing means 43 compares a count value of a number of cycle counter 41 with a set value set by the number of value cycle setting means 43, and when the count value exceeds the set value, grease supplying signal is output to a grease supplying timing control means 47. A number of grease supply comparing means 45 compares a count value of a number of grease supply counter 44 with a set number set by a number of grease supply setting means 46, and outputs the grease supply start signal to a grease supply timing control means 47 till the count value exceeds the set value. The grease supplying timing control means 47 operates a grease supplying pump during the time set by a grease supplying timer 48. With this structure that the grease supplying operation is performed by the set number of time, the optimal quantity of the grease can be supplied in response to the volume of a grease groove, and the deteriorated grease is discharged so that the new grease is always supplied.