Automatic tape-fixing device for carton-sealing machine

An automatic tape-fixing device for a carton sealing machine, having means for applying tapes along the edges of a carton, and being equipped with short and elongated brushes disposed in line and at adjustable distance from each other along the upper and lower sides of upper and lower frames in a symmetric manner to apply tapes to four edges simultaneously of a forwardly moving carton, and said short and elongated brushes operated by air-actuated cylinders being disposed at a proper distance from the tape applying means, said tape-fixing device comprising:

• a short brush having a split-clamp end for securing the same to a chain member driven by a pair of sprockets each having a gear located thereunder which engages with a rack disposed in front of an air-actuated cylinder so that said short brush can be actuated to repeatedly move back and forth;
• an elongated brush being disposed in line and at proper distance, next to said short brush, and provided with an extended pin at each end thereof which is in contact association with a knife-shaped cam protrusion for confinedly guiding the movement of said elongated brush by means of the contour of said cam protrusion, and said elongated brush being connected to a brush actuating base by an elongate hinge bar having a pair of twisting springs located at each end thereof to change the operating position of said brush actuating base. and an air-actuated cylinder being secured to the bottom of the base;
• the above-mentioned components being structured so that the components are disposed in pairs on an upper and lower frame, four worm rods being disposed between the frames and secured to said upper frame with their top ends by four mounting seats, and at the bottom ends thereof being provided with sprockets, connected to each other by a chain member so that said four worm rods can be simultaneously actuated to rotate by a motor located at the bottom end of one worm rod to effect adjustment of the distance between said upper and lower frames, the distance between conveyor belts disposed on said upper and lower frames being changed by moving one of said conveyor belts to the left or right by means of a worm rod horizontally disposed with one end thereof secured to a mounting seat and the other end attached to a turning knob so that the conveyor belts can be adjusted for cartons of different size.