4:3 perf conversion sprocket

The display with a gear rolling module a mechanism for making the film film projectors or any film operation device of locomotive and pushing to 4 is or 3 to any one of film is converted are coaxially. With the gear shaft module comprises a cylindrical outer cylinder; when the rolling film and device, the tooth is a sleeve and depicting is a film, wherein a cylinder sleeve which can is coupled to communicate with the cylindrical outer cylinder state of without the rotary transformer. The sleeve is further provided with a vision with the tooth of film layer and depicting is; the less-than container load on film projector rotating shaft. And the outer cylinder capable on or move away, a pillar is willing is 3 to a user is 4 to film. The size of configured inner and outer sleeve is the: When the outer cylinder is; the locomotive when the pushing and speed of film is an inner independent workpiece 4/3.