Machine
Mechanism
noun
A machine contraption is just a machine
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.
それはなんの機械ですか？
What kind of machine is that?
今日は機械の調子があんまり良くないんだよね。
Today the machine is not working very smoothly.
コウイチは会社用にバッティングセンターの機械を買いました。
Koichi bought a batting cage machine for the office