Abstract: A grinding machine includes a main part and an end case. A driving unit is connected to the end case and includes a first motor which has an output shaft with a groove. A grinding unit is connected to the end case, and cantilevered above the main part. The grinding unit includes a grinding wheel set which has a central axle with a slide. The slide is located in the groove of the output shaft of the first motor. A driving wheel is connected to the central axle. An adjustment device includes a second motor which drives an eccentric unit that has an eccentric axle, and the eccentric axle extends through a bearing which is located in a recess formed to the driving wheel. The driving wheel is driven by the eccentric unit to move the grinding wheel set of the grinding unit left and right.

Abstract: A grinding machine includes a base having a plate and a movable device which is connected to the plate. A driving unit is connected to one end of the base and includes having a first motor which has a hollow shaft. An oval hole is defined in the hollow shaft. A grinding unit is located across the top of the plate and includes a body and a grinding part. The grinding part is slidably connected to a slot of the body and has a shaft unit which is located in the oval hole of the hollow shaft. A transverse moving unit is connected to the grinding part and has a second driving motor. A cam link is connected between the driving motor and the grinding part. The grinding part is moved transversely relative to the plate by the cam link driven by the second driving motor.

Abstract: A grinding machine includes a base having a plate and a movable device which is connected to the plate. A driving unit is connected to one end of the base and includes having a first motor which has a hollow shaft. An oval hole is defined in the hollow shaft. A grinding unit is located across the top of the plate and includes a body and a grinding part. The grinding part is slidably connected to a slot of the body and has a shaft unit which is located in the oval hole of the hollow shaft. A transverse moving unit is connected to the grinding part and has a second driving motor. A cam link is connected between the driving motor and the grinding part. The grinding part is moved transversely relative to the plate by the cam link driven by the second driving motor.

Abstract: A grinding machine includes a support and a board which is connected to the connection portion of the support. The board has a first opening and a second opening. A transportation device is connected across over the first and second openings. A grinding device has a driving portion and a grinding portion which is connected to the driving portion. The driving portion is connected to the support so that the grinding portion is located above the transportation device. An angle adjustment device is connected between the board and the transportation device so as to adjust inclination of the transportation device so as to grind a larger area of an object.

Abstract: A grinding machine includes a support and a board which is connected to the connection portion of the support. The board has a first opening and a second opening. A transportation device is connected across over the first and second openings. A grinding device has a driving portion and a grinding portion which is connected to the driving portion. The driving portion is connected to the support so that the grinding portion is located above the transportation device. An angle adjustment device is connected between the board and the transportation device so as to adjust inclination of the transportation device so as to grind a larger area of an object.

Abstract: A grinding machine includes a base with a U-shaped frame on the base. The U-shaped frame has two extensions and each have a first hole and a second hole which is an oval hole. A grinding roller is connected to the frame. An adjustment device includes a first shaft and a second shaft. The first shaft extends through a portion of the base and the two respective first holes of the extensions. The second shaft extends through the second holes of the two extensions. An eccentric sleeve and an adjustment member are located in the second hole of one of the extensions, and each have an eccentric hole. The adjustment member is mounted to the eccentric sleeve. The second shaft extends through the two eccentric holes. When rotating the adjustment member and the eccentric sleeve, the frame and the grinding roller are pivoted about the first shaft.

Abstract: An adjustment device for adjusting a level difference between rollers of a roller belt sander includes a base, an eccentric shaft and a restricting knob. The base is fixed on an interior wall edge of a main body corresponding to two ends of a roller. The eccentric shaft inserted pivotally in a penetrating opening of the base has a rear end portion, and a front-end engaging portion formed eccentrically to engage with the roller pivotally. The restricting knob is engaged in a threaded hole of the base to fix the eccentric shaft. Therefore, the adjustment device can be turned to enable the roller positioned at a level for preferable grinding.

Abstract: A high-efficiency dust collecting device with two gateways is connected with exits of a cover of a sand grinder and above two sanding belt rollers., composed of a first gateway set and a second gateway set, which are both formed integrally with a metallic panel and provided respectively with a first and a second arc-like panel, a first and a second blocking plate, and two first and two second dust-guiding plates. A first and a second gateway are respectively formed between the arc-like panel and the blocking plate so as to suck in the dust or the wood flour generated while grinding a workpiece. The dust or the wood flour is then sucked further to pass through the exits to the collecting device, favored by the dust-guiding plates.

Abstract: An adjustment device for adjusting a level difference between rollers of a roller belt sander includes a base, an eccentric shaft and a restricting knob. The base is fixed on an interior wall edge of a main body corresponding to two ends of a roller. The eccentric shaft inserted pivotally in a penetrating opening of the base has a rear end portion, and a front-end engaging portion formed eccentrically to engage with the roller pivotally. The restricting knob is engaged in a threaded hole of the base to fix the eccentric shaft. Therefore, the adjustment device can be turned to enable the roller positioned at a level for preferable grinding.

Abstract: A grinding-band swaying device for a band grinding machine includes a motor pivotally connected with a machine base and driving an endless grinding band around two rollers and forming a fulcrum for swaying, a speed-reducing unit and an eccentric wheel. The speed-reducing unit is positioned under the motor, having a shaft connected with the eccentric wheel. An elastic compressing unit is provided between the speed-reducing unit or the motor and the machine base, and then the eccentric wheel is kept to elastically urge the machine base. When the motor together with the speed-reducing unit rotates the eccentric wheel, the speed-reducing unit, the motor and the roller sway regularly with the fulcrum and then the endless grinding band moves forward and also sways regularly synchronously to perform grinding against a work with grinding angles constantly altered to achieve balanced grinding result.

Abstract: An adjusting device for the sanding drum of a double-drum sander is installed between the opposite ends of the rear grinding drum and the machine frame of a sander for adjusting a rear sanding drum to a most suitable height to match with the size number of the emery of the front sanding drum of the sander so as to carry out abrading with excellent effect.