Patent WO-2019182288-A1 (WO)
Inventor: LEE SOO HYUNG
IPC: B65H18/04
Filed: 2019-03-14
Abstract: The present invention relates to a friction shaft for a slitter, wherein a winding pipe is installed on the outer surface thereof so as to wind a unit material in a roll type, the unit material being formed by cutting a raw material, such as various kinds of paper, raw fabrics, or films, at a predetermined interval. More specifically, the present invention relates to a friction shaft for a slitter, the friction shaft comprising a tube comprising a first rotating shaft rotated by a driving motor and supplied with compressed air from an air supply portion. The first rotating shaft has a movement passage formed therein and elongated in the longitudinal direction of the first rotating shaft. First and second supply holes are formed on one side of the outer surface of the first rotating shaft and are connected to the movement passage such that compressed air is supplied through the same. First discharge holes are formed through the opposite side of the outer surface of the first rotating shaft at a predetermined interval along the circumference of the first rotating shaft and are elongated in the longitudinal direction of the first rotating shaft such that the same are connected to the movement passage. Second discharge holes are formed through the opposite side of the outer surface of the first rotating shaft between the multiple first discharge holes at a predetermined interval along the first rotting shaft and are elongated in the longitudinal direction of the first rotating shaft. An engaging ledge is formed to protrude from one open end of each second discharge hole. Connecting holes are formed inside the tube so as to connect the movement passage and the second discharge holes. Fitting holes are formed on the outer peripheral surface of the first rotating shaft on the periphery of the first discharge holes at a predetermined interval along the longitudinal direction of the first rotating shaft. First fastening holes are formed in the fitting holes. The tube has supply holes installed in the second discharge holes and connected to the connecting holes. The friction shaft comprises multiple lug bodies for torque installed to be adjacent to each other along the longitudinal direction of the second discharge holes. The lug bodies for friction have installation holes installed so as to penetrate the inside thereof in the longitudinal direction. Insertion holes are formed through the outer surfaces of the lug bodies for torque at a predetermined interval along the longitudinal direction and are connected to the installation holes. Engaging portions are formed on the outer surfaces of the lug bodies for torque so as to protrude toward both sides of the installation holes so as to engage with the engaging ledges. Guide holes are formed through the outer surfaces the lug bodies for torque and are elongated in the longitudinal direction such that the same are connected to the insertion holes. The friction shaft comprises a first fixed shaft installed in the installation holes and multiple lug rollers for torque inserted into the insertion holes and installed on the first fixed shaft to be rotated by first bearings. The friction shaft comprises multiple brake pads installed between the tube and respective lug bodies for torque and inserted into respective guide holes. Friction portions are formed to protrude from the outer surfaces of the brake pads at a predetermined interval along the longitudinal direction and are forced against the lug rollers for torque. The friction shaft comprises a guide member comprising a second rotating shaft installed to be able to move along the movement passage. The second rotating shaft has a movement groove formed on one side of the outer surface thereof in a circular shape in the longitudinal direction of the second rotating shaft so as to move compressed air supplied from the second supply holes to the connecting holes. Second fastening holes are formed at a predetermined interval through the opposite side of the outer surface of the second rotating shaft along the longitudinal direction of the second rotating shaft so as to face the first discharge holes. Third fastening holes are formed through the outer surface of the second rotating shaft at a predetermined interval along the circumference of the second rotating shaft so as to face the first discharge holes, and are fastened to the second fastening holes by fastening members. A first sloping surface is formed on the outer surface of the second rotating shaft so as to face the first discharge holes. The friction shaft comprises multiple lug bodies for clamping arranged adjacent to each other along the longitudinal direction of the first discharge holes. Second sloping surfaces are formed on one side of the outer surfaces of the lug bodies for clamping and are guided by first sloping surfaces. Insertion holes are formed on the opposite side of the outer surfaces of the lug bodies for clamping, and installation holes are formed to penetrate the same on both sides of the insertion holes. Engaging portions are formed to protrude from both sides of the outer surfaces adjacent to the second sloping surfaces and the insertion holes. The friction shaft comprises a second fixed shaft installed in the installation holes and comprises multiple lug rollers for clamping inserted into the insertion holes and installed on the second fixed shaft so as to be rotated by second bearings. The friction shaft comprises a cover fitted to the fitting holes and fastened to the first fastening holes by fastening members. The cover has fourth fastening holes formed on the outer surface thereof, and the engaging portions engage therewith. The friction shaft comprises a first elastic member installed between the movement passage and the second rotating shaft so as to return the second rotating shaft, which has moved, to the original position, and a second elastic member installed between the engaging portions and the cover so as to return to the lug bodies for clamping, which have moved, to the original position. If compressed air is supplied to the movement passage through the first supply holes, the second rotating shaft is moved along the movement passage by pressure of the compressed air, and the second sloping surfaces are guided by the first sloping surfaces. Accordingly, the lug bodies for clamping are moved, and the lug rollers for clamping are discharged from the first discharge holes. The discharged lug rollers for clamping are forced against the inner surface of the winding pipe. The second supply holes, the movement groove, and the connecting holes are connected by the moved second rotating shaft. If compressed air successively passes through the second supply holes, the movement groove, and the connecting holes and is supplied into the supply holes of the tube, the tube is expanded by pressure of the compressed air. Accordingly, the lug bodies for torque and the brake pads are moved, and the lug rollers for torque are discharged from the second discharge holes. The discharged lug rollers for torque are forced against the friction portions and are forced against the inner surface of the winding pipe.