Abstract: A pneumatic edge trimming machine has a base a center of which having a hole. A sleeve extends upwards from the base for receiving a hollow outer casing. The outer casing has a top and a lower end; and the top and lower end of the outer casing are fixed to an inner casing through a frame. A space penetrating the inner casing and outer casing is formed. The inner casing is used to be installed with a pneumatic motor. A shaft is extended from a pneumatic motor. The shaft has a tool combining portion which exposes out of the hole at the base. The inner casing has an air inlet and a control switch. The inner casing has a vent facing toward a top of the outer casing, and the top of the outer casing being connected to a predetermined space by a tube. Therefore dust can be absorbed automatically in working.

Abstract: A protective cover detachably installed on a cutting machine/engraving machine combination including a main body and a protective cover. The protective cover is disposed with a fixing ring which can be directly tightened on an outer thread section of the main body. The gap of the split of the fixing ring can be changed by means of a tightening member so as to tightly engage the inner thread section of the fixing ring with the outer thread section of the main body without loosening. Therefore, the protective cover can be quickly and conveniently installed and taken off from the main body.

Abstract: A pneumatic edge trimming machine has a base a center of which having a hole. A sleeve extends upwards from the base for receiving a hollow outer casing. The outer casing has a top and a lower end; and the top and lower end of the outer casing are fixed to an inner casing through a frame. A space penetrating the inner casing and outer casing is formed. The inner casing is used to be installed with a pneumatic motor. A shaft is extended from a pneumatic motor. The shaft has a tool combining portion which exposes out of the hole at the base. The inner casing has an air inlet and a control switch. The inner casing has a vent facing toward a top of the outer casing, and the top of the outer casing being connected to a predetermined space by a tube. Therefore dust can be absorbed automatically in working.

Abstract: A protective cover detachably installed on a cutting machine/engraving machine combination including a main body and a protective cover. The protective cover is disposed with a fixing ring which can be directly tightened on an outer thread section of the main body. The gap of the split of the fixing ring can be changed by means of a tightening member so as to tightly engage the inner thread section of the fixing ring with the outer thread section of the main body without loosening. Therefore, the protective cover can be quickly and conveniently installed and taken off from the main body.