Abstract: A central axis adjustment structure of a tailstock of a woodworking lathe is disclosed. The tailstock has a circular hole therein, a front opening and a rear opening at front and rear ends of the tailstock. An end surface of the front opening has at least one screw hole. A guide rod is disposed in the circular hole, and has a rear end extending out of the rear opening. A collar is fitted onto an axial connecting shaft that is inserted in the circular hole. The guide rod is insertedly connected to a rear end of the axial connecting shaft. The collar has at least one perforation corresponding to the screw hole. At least one bolt is inserted through the perforation and screwed to the screw hole so that the collar is locked to the front end of the tailstock. A first annular gap is defined between the guide rod and the rear opening of the tailstock. A second annular gap is defined between the axial connecting shaft and the front opening of the tailstock.

Abstract: A lifting structure of an engraving machine is provided. A lifting platform of the engraving machine has four pivot holes each provided with a screw seat, and is mounted with a shaft seat having a drive gear. A sprocket is provided under each screw seat. A driven gear is provided under one of the sprockets to mesh with the drive gear. The sprockets of the pivot holes are connected by a chain. The screw seat includes an upper screw sleeve, a lower screw sleeve, an upper thrust bearing, a lower thrust bearing, and a spring. The lower screw sleeve is rotatable in the pivot hole through the upper thrust bearing and the lower thrust bearing. The spring is located between the upper screw sleeve and the lower screw sleeve. Two screws pass through the upper screw seat and are screwed to the lower screw seat, respectively.

Abstract: A motor fixing structure of an engraving machine is provided. A lifting platform has a through hole, at least three protruding walls spaced and arranged around the through hole, and notches each defined between every two of the protruding walls. The outer side of each notch is provided with a clamping block. The lifting platform has a radial guide hole corresponding in position to the clamping block. The clamping block has a vertical aperture. The bottom surface of the lifting platform has an adjustment seat with a peroration. The protruding walls are fitted with a turning disc. The turning disc has at least three oblique curved holes. The turning disc is pivotally connected with a shaft. A drive rod is screwed to the shaft. A quick release assembly is inserted in the corresponding oblique curved holes, the aperture and the guide hole for tightening or loosening the clamping block.

Abstract: A speed change auxiliary device of a lathe is provided. A side chamber of the lathe is provided with a shaft seat and a bottom shaft seat at the top and bottom thereof. An auxiliary device is provided between the shaft seat and the bottom shaft seat. The auxiliary device includes a shaft. A spring, an eccentric block, an engaging member, a positioning nut, a rotary sleeve and a fixing block are fitted on the shaft. The rotary sleeve includes a handle. Two sides of an inner circumferential surface of the rotary sleeve have protrusions. The protrusions each have an upright surface and an upper guide bevel at two sides thereof. The fixing block is disposed on the bottom shaft seat. Two sides of a circumferential surface of the fixing block have recesses. The recesses each have a stop surface and a lower guide bevel at two sides thereof.

Abstract: A working height adjustment device of a processing machine includes a slide seat mounted to a fixing frame seat. The slide seat is provided with an adjustment seat having a through hole. The through hole is inserted with a micro adjustment rod having a threaded section. The micro adjustment rod is pivotally connected with a rotatable handle. A control rod having a link rod is provided between the fixing frame seat and the slide seat. The adjustment seat has an accommodation hole which is provided with an elastic member, a movable member and a push knob. The movable member has an engaging hole. One side of the engaging hole is formed with a toothed portion. The threaded section of the micro adjustment rod passes through the engaging hole. One end of the movable member is inserted into the elastic member, and another end is connected with the push knob.

Abstract: A working height adjustment device of a processing machine includes a retaining frame, a slide seat, and a lever having a connecting rod pivoted between the retaining frame and the slide seat. An adjustment seat of the slide seat has an accommodation hole. The accommodation hole is provided with an elastic member, a movable member, and an eccentric rod. The movable member has an engaging hole. The engaging hole has a diameter greater than that of a micro adjustment screw rod. The engaging hole has a toothed portion. Thereby, the eccentric rod is turned to push or release the movable member for the toothed portion of the engaging hole to engage with or disengage from a threaded section of the micro adjustment screw rod, such that the micro adjustment screw rod is tuned or the lever is pulled up and down to adjust the cutter seat quickly.

Abstract: A movement auxiliary device for a machine stand includes a foot stand. Two sides of the lower end of the foot stand are provided with first and second side seats having vertical rail grooves, respectively. A movable lever, a pivot seat and a lifting roller assembly are provided between the two rail grooves. The foot stand is provided with a support seat. A connecting board having a pedal is pivotally connected between the support seat and the pivot seat, which can be pivoted on the pivot seat. The movable lever is pivotally connected with a pneumatic cylinder to provide a buffering function for the lifting roller assembly and the machine stand. The pedal is controlled for the connecting board and the pivot seat to generate a link pivot, such that the lifting roller assembly is descended to the ground or ascended upward.

Abstract: A woodworking lathe adjustment structure includes a base having an axial slide trough thereon, a head unit and a tail unit disposed on the base. An adjustment block is provided between the head unit/the tail unit and the slide trough. The adjustment block includes a groove, a space adjustment bolt, and an adjustment bolt. The groove has a compelling hole therein. The compelling hole has a threaded section and a non-threaded section therein. The space adjustment bolt is screwed to the threaded section. The adjustment block is secured to the bottom of the head unit/the tail unit by fixing bolts, respectively, and inserted in the slide trough. When the space adjustment bolt passes the non-threaded section of the compelling hole, the sides of the groove will be deformed outward and curvedly to offset a gap which is caused by wear and tear of the adjustment block and the slide trough.

Abstract: A main shaft structure of a tool machine includes a base, a worktable, a motor fixing seat, a cutter seat, and a cutter wheel unit. The worktable is mounted on the base. The motor fixing seat is connected to one side of the base, and another side is connected with the cutter seat. Two ends of the cutter seat respectively have bearing recesses and first positioning portions close to the bearing recesses. The cutter wheel unit is coupled to the cutter seat. Two ends of the cutter wheel unit are provided with bearing seats which are placed into the bearing recesses. The bearing seats have second positioning portions to connect with the first positioning portions, so that the cutter wheel unit can be detached from the cutter seat quickly.

Abstract: An abrasive apparatus of a sander is provided. The abrasive apparatus is disposed above a worktable of the sander and includes a base and a lift unit. At least one abrasive wheel is provided in the base. The base has a top formed with at least one slot. The lift unit is disposed on the abrasive wheel to bring the abrasive wheel to move up so that an abrasive surface of the abrasive wheel passes through the slot of the base and protrudes from the base for the top of the base to sand the side of a workpiece. The cutting width of the sander can be extended to enhance the use of the sander, so the manufacturing process can be shortened to increase the production efficiency.

Abstract: The invention relates to a low load swinging mechanism for a sander. The sander includes a roller unit that has a positioning base provided with two sliding rails for contacting with a connecting member of a sliding base. The sliding rail has an arc surface and the connecting member possesses a corner groove recessed with a certain angle, so that the surface of the corner groove is to contact linearly with the arc surface of the sliding rail to reduce a great abrasion resistance as the sliding base is reciprocating on the positioning base, for upgrading grinding precision.

Abstract: A chisel quickly adjusting and positioning device for a chiseling machine includes a plurality of separating members for adjusting a gap between a sleeve and the bottom of a machine body, and a chisel unit composed of a chisel and a drill fitting lengthwise in the chisel. After the drill is fitted in the chisel and then clamped in a drill chuck, the chisel unit is fitted in the sleeve. Then the separating members can be pivotally moved in or out of the gap between the sleeve and the bottom of the machine body, and then the sleeve is pushed up so that a gap between the chisel blade and the tip of the drill may be formed for quickly adjusting and positioning the chisel unit with the machine body.

Abstract: The quickly-detachable protective cover unit of a table sawing machine includes a protective cover, a non-return plate, a protective plate, a combining plate and an extending plate. The extending plate positioned at one side of the saw blade of a table sawing machine has its inner end fixed with a quickly-detachable handle unit for positioning the combining plate thereon. The protective plate is inserted through the saw blade and the combining plate, positioned on the table-sawing machine. The non-return plate and the protective cover are respectively provided with a quickly detachable device to fit in the positioning hole of the combining plate. The components of the quickly detachable protective cover unit are combined by quickly detachable mechanism so they can be disassembled or assembled quickly, needing no tool for carrying out disassembling work.

Abstract: A clutch device for a roller sand for controlling reciprocating movement of a roller includes a belt wheel, a connecting shaft and a adjusting button. The roller sander consists of a base, a motor set, a roller set and a linking device. The belt wheel is pivotally connected with the connecting shaft, mounted around by a belt that is also mounted around a belt wheel of a shaft of the motor set. In addition, the belt wheel of the clutch device is provided with plural fixing grooves at its front end. The adjusting button is connected with the connecting shaft, provided with a fixing bar fitting in a slot in an annular outer surface of said connecting shaft. Then the adjusting button is pushed in or pulled out to let the roller reciprocate or not. Therefore, two operating ways are optional for the roller sander.