Abstract: A laser alignment system is affixed to a drilling machine M, the laser alignment system contains: a base, two first fixers, two lamp holders, two second fixers, two first resilient elements, two first adjustable screws, two second resilient elements, and two second adjustable screws. The base includes two symmetrical holding sections, two extensions, and two peripheral orifices. Each first fixer has a first arcuate portion, an accommodation hole, a first threaded hole, a limitation hole, a first protrusion and a second protrusion. Each lamp holder includes a peripheral knob, a first receiving orifice, a first rotation portion, a second rotation portion, and a swing portion. Each second fixer includes a second arcuate portion, a second receiving orifice, a first projection and a second projection.

Abstract: An upward-opening abrasive cloth roller has a roller below the abrasive cloth. The system has: a support frame mounted on a machine, a roller is disposed on the support frame, a hollow panel is mounted on the machine, and the first side of the panel is pivotally connected to the machine. The two ends of the support frame are respectively provided with individual height adjustment structures, and a panel level adjustment structure is mounted on the machine on below the second side of the panel. With the above two adjustment structures to adjust the level of the roller and the panel, the plate can be easily adjusted for different grinding depths and angles.

Abstract: A driving structure for upward-opening abrasive cloth roller mainly consists a motor mounted in the roller. The driving structure includes: a roller, a first side member, a second side member, a motor with an outer ring gear integrated into a rotating structure; and a motor, a linking shaft bearing, a connecting member, a fixed member and a second bearing integrated with the roller as a stationary structure. The power of the motor is transmitted to the linking shaft, the sun gear, the planet gear through the rotating shaft of the motor, and finally transmitted to the outer ring gear, so that the roller can be rotated.

Abstract: A transmission structure of a woodworking lathe contains: a case, a driven gear, a first gear set, a second gear set, and an adjustment lever. The case includes a transmission shaft, a variable speed shaft, and a driven shaft. The driven gear is fixed on the variable speed shaft and meshes with the transmission gear. The first gear set contains a first gear and a third gear which is coaxial with the first gear. Diameters of the first gear and the third gear are different. The second gear set is disposed on the variable speed shaft and contains a second gear and a fourth gear, a diameter of the second gear corresponds to a diameter of the first gear, and a diameter of the fourth gear corresponds to a diameter of the third gear. The adjustment lever is defined between the second gear and the fourth gear.

Abstract: A laser alignment system is affixed to a drilling machine M, the laser alignment system contains: a base, two first fixers, two lamp holders, two second fixers, two first resilient elements, two first adjustable screws, two second resilient elements, and two second adjustable screws. The base includes two symmetrical holding sections, two extensions, and two peripheral orifices. Each first fixer has a first arcuate portion, an accommodation hole, a first threaded hole, a limitation hole, a first protrusion and a second protrusion. Each lamp holder includes a peripheral knob, a first receiving orifice, a first rotation portion, a second rotation portion, and a swing portion. Each second fixer includes a second arcuate portion, a second receiving orifice, a first projection and a second projection.

Abstract: A transmission structure of a drilling machine contains: a housing, a drive shaft, a drive gear, a guide gear, a speed change gear assembly, a driven gear assembly, and a control knob. The housing include a first accommodation groove for housing the drive shaft, a second accommodation groove for accommodating the guide shaft, a third accommodation groove for housing the speed shaft, and a fourth accommodation groove for accommodating the driven shaft. The drive gear is connected on the drive shaft, and the guide gear is coupled on the guide shaft and meshes with the drive gear. The speed change gear assembly includes a connection gear and at least two speed change gears. The driven gear assembly includes at least two driven gears corresponding to at least two speed change gears respectively. The control knob configured to drive the driven gear assembly to move upward and downward.

Abstract: A transmission structure of a drilling machine contains: a housing, a drive shaft, a drive gear, a guide gear, a speed change gear assembly, a driven gear assembly, and a control knob. The housing include a first accommodation groove for housing the drive shaft, a second accommodation groove for accommodating the guide shaft, a third accommodation groove for housing the speed shaft, and a fourth accommodation groove for accommodating the driven shaft. The drive gear is connected on the drive shaft, and the guide gear is coupled on the guide shaft and meshes with the drive gear. The speed change gear assembly includes a connection gear and at least two speed change gears. The driven gear assembly includes at least two driven gears corresponding to at least two speed change gears respectively. The control knob configured to drive the driven gear assembly to move upward and downward.

Abstract: A gear reduction device having a positioning assembly contains: a gear box, a drive motor, an accommodation box, and a braking device. The gear box is connected with the drive motor and accommodates at least one gear set, the braking device is electrically connected with the drive motor, and the accommodation box is disposed outside the drive motor. The positioning assembly is located on a top of the gear reducer and includes a driving gear, a driven gear, a fixing gear, a support plate, a screw rod, and multiple limit switches. The driving gear is connected on the gear box, and the driven gear is fixed on the gear box and meshes with the driving gear. The screw rod is mounted on the support plate, connects with the fixing gear, and meshes with the driven gear. The multiple limit switches are disposed on the support plate.

Abstract: A driving mechanism used in a treadmill and concealed inside a tubular driving roller for rotating the tubular driving roller in moving an endless running belt through a driving gear of a transmission shaft, a reduction gear, a driven gear of a driven shaft and an internal gear.

Abstract: A cylindrical motor housing having a plurality of longitudinally extended substantially T-shaped radiating fins arranged in parallel and spaced around the periphery for dissipation of heat, and a plurality of invertedly disposed T-grooves defined between the T-shaped radiating fins for ventilation.