A torque transmission coupling includes a rotating shaft and a drive pinion shaft for carrying out input and output transmission of a torque. The kernel of the present invention lies in that one or more bactericidal lamps having a sterilization effect with its photocatalytic film is provided to radiate conterminated part of the user’s body thereby serving a sterilization effect during cleansing with water injection. One approach of this invention uses this shadow technique to perform functions such as theft deterrencedetection; tracking the motion of objects through an environment by monitoring the shadow; and correlation analysis of people shadows to tagged items to foster marketing and merchandizing effectiveness. The overall running speed in the machine remains at a constant velocity due to the resultant festooning effect and thus the dwell time for bonding is increased. The first housing is coupled with the mounting assembly and includes an assembling portion to be connected with the first engaging portion.