Patent ID: 7621800

Claim:
A belt grinding machine with a belt adjusting device, comprising: a housing provided with a start switch and a stop switch for starting and stopping a motor, respectively, one side of the housing being open; the motor being disposed at the other side of the housing and disposed on a carrying platform, the housing being defined with an elongated through hole for insertion of a shaft of the motor; the shaft of the motor being inserted into a drive roller for driving it to rotate; two supporting racks being disposed in the housing, one end of each supporting rack being provided with two legs, a gap being formed between the legs of each supporting rack; a driven roller, both ends of which being received in the gaps of the supporting racks; a belt winding around the drive roller and the driven roller and being provided for performing a grinding operation; an outer cover being pivotally disposed at and covering the open side of the housing; and an adjusting device for adjusting a position of the belt; characterized in that: the adjusting device is disposed on the supporting rack opposite the outer cover and comprises a screw having a conical surface, a nut and a push rod, the supporting rack opposite the outer cover is defined with a L-shaped penetrated hole having a hole with inner threads in one end thereof; the outer cover is defined with a penetrating hole located correspondingly to the hole having inner threads; one end of the screw of the adjusting device is firstly threaded in the nut, and then is threaded in the hole having inner threads, the other end of the screw is exposed out of the penetrating hole of the outer cover; one end of the push rod is inserted into the hole via the gap of the supporting rack opposite the outer cover and is in the form of an inclined surface for abutting against the conical surface of the screw, the other end of the push rod is protruded out of the supporting rack opposite the outer cover and is pressed against a bearing located at one end of the driven roller, rotating the screw makes its conical surface push the push rod, so that the push rod moves axially to push the driven roller, thus the driven roller is adjusted; a semicircle-shaped stopper with both ends fixed to the legs of each supporting rack restricts both ends of the driven roller in the gap of the respective supporting racks and allows the adjusting device to adjust a position of the driven roller; the housing is provided with an emergency switch, when the outer cover is open, it will press the emergency switch of the housing and consequently cut off the power supply, so as to stop the motor.