变换齿轮 meaning in English

change gear
change wheel
translating gear
transposing gear

Unwinding roller is made of stainless composite piping material , which has the following advantages : ( smooth on surface , non - pilling , non - knotting , non - slip - stick , unity in unwinding expansion , good core - spunned result ) , roller seat , driven chain , traction changing gear , adjustable bearing godet wheel , driven cover
退绕罗拉：采用不锈钢复合管材料制作，该种材料具有以下几种优点（表面光滑、卜挂丝、不缠丝、不打滑、退绕张力均匀、包芯效果好）、罗拉托座、传动链轮、牵伸变换齿轮、可调试轴承导丝轮、传动防护罩。