a screw feed mechanism housed in a second housing with a second housing opening, wherein the second housing supports a thrust force acting on {HEAD ~ a thrust receiving flange} provided to a male thread member of the screw feed mechanism and the first housing opening is connected to {TAIL ~ the second housing opening} in an axial direction; and 
a screw feed mechanism housed in a second housing with a second housing opening , wherein the second housing supports a thrust force acting on { HEAD ~ a thrust receiving flange } provided to a male thread member of the screw feed mechanism and the first housing opening is connected to { TAIL ~ the second housing opening } in an axial direction ; and
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