Speed changing transmission mechanism of sheet laminating apparatus

A speed changing transmission mechanism of a sheet laminating apparatus for driving a hot press roller of said sheet laminating apparatus to rotate at a first rotating speed or a second rotating speed or in a reverse direction, said speed changing transmission mechanism comprising:

• a reverse module for withdrawing a sheet article from said sheet laminating apparatus when said hot press roller is operated in said reverse direction, and comprising a reverse gear and a reverse clutch gear arranged at a first side of said reverse gear;
• a power output shaft penetrating through said reverse gear and said reverse clutch gear;
• a power input module for providing motive power to rotate said power output shaft, and comprising a first rotating speed driving roller, a second rotating speed driving roller, a clutch gear, a power input shaft and a unidirectional motor, wherein said clutch gear is engaged with said reverse module, said power input shaft penetrates through said first rotating speed driving roller, said second rotating speed driving roller and said clutch gear, and said unidirectional motor provides said motive power to said power output shaft;
• and
• a shift module contacted with said reverse clutch gear and said clutch gear for moving said reverse clutch gear along said power output shaft to be coupled with said reverse gear, or moving said clutch gear to be coupled with either said first rotating speed driving roller or said second rotating speed driving roller, wherein said hot press roller is rotated in said reverse direction if said reverse clutch gear is coupled with said reverse gear, said hot press roller is rotated in said first rotating speed if said clutch gear is coupled with said first rotating speed driving roller, and said hot press roller is rotated in said second rotating speed if said clutch gear is coupled with said second rotating speed driving roller.