Patent ID: 7556077
Filing Date: 2009-07-07
Classification: B32B,F16H,Y10T

Abstract:
1. A speed-change transmission mechanism comprising: a power drive; a transmission shaft coupled to and rotatable by said power drive; two thermal-compression rolls arranged in parallel; a plurality of driving gears respectively fixedly mounted on said transmission shaft for rotation with said transmission shaft, said driving gears including a master driving gear and at least one supplementary driving gear; a first driven gear fixedly mounted on one end of one of said thermal-compression rolls; a driven shaft fixedly connected to one side of said driven gear for rotating said driven gear, said driven shaft having at least one longitudinal key groove; a master transmission gear mounted on and movable along said driven shaft and meshed with said master driving gear, said master transmission gear having at least one key engaged into said at least one longitudinal key groove of said driven shaft for allowing rotation of said master transmission gear with said driven shaft and axial movement of said master transmission gear relative to said driven shaft and at least one plug; at least one supplementary transmission gear respectively sleeved onto said driven shaft and rotatable relative to said driven shaft and respectively meshed with said at least one supplementary driving gear, said at least one supplementary transmission gear each having at least one retaining notch for receiving the at least one plug of said master transmission gear; and a switching device adapted to move said master transmission gear along said driven shaft and to further force the at least one plug of said master transmission gear into engagement with the at least one retaining notch of one of said at least one supplementary transmission gear for enabling the respective supplementary transmission gear to be rotated with said master transmission gear when said master transmission gear is kept meshed with said master driving gear.