PURPOSE: To make it possible to surely carry out an electronic attaching process, by locking the rotation of an auxiliary holder attached to a main holder to selectively use a plurality of absorbing heads.

CONSTITUTION: When an auxiliary holder 14 comes to a certain station, a selector gear 44 is positioned above a driven gear 15 while the free end of a lever 54 enters in a lever receiver 53, and a lock pin 49 is engaged in a groove 52 to lock an auxiliary holder 14. When an absorbing head 16 is replaced with another one, an elevator 41 lowers to mesh the selector gear 44 with the driven gear 15 so that the lever 54 rotates, resulting in that the lock pin 49 comes off from the groove 52, thereby the auxiliary holder 14 is made rotatable. When the elevator 41 is raised after the angle of the auxiliary holder 14 is changed, the lever 54 is returned to its original position so that the lock pin 49 is engaged in the groove 52 to lock the auxiliary holder 14.