Abstract: A package strapping machine draws a thermoplastic strap off of a reel, loops the strap around a package, clamps a leading end of the strap, and then tightens the strap around the package with a strap tightening mechanism. A trailing end of the strap is cut underneath the leading end, and then both these ends are automatically welded together. When the strap is tightened, a portion of the strap is fed back towards the reel. The reel is provided with a device for rewinding this portion of the strap. A spiral spring stores energy from the rotation of the reel when the strap is drawn off, and when the strap is fed back the spiral spring causes the reel to rotate so as to rewind the strap. Because the strap is fed back towards the reel faster than the reel can rewind the strap, a loose strap portion accumulates between the reel and the strap tightening mechanism.

Abstract: A package strapping machine is capable of strapping a package with an adjusted, gentle force by welding ends of a thermoplastic strap. The machine is provided with a strap-elevating member in proximity to a strap-receiving element mounted on a pivotal member. Overlapping ends of a thermoplastic strap are looped around the strap-receiving element and the package, and are then welded under the strap-receiving element. The strap-receiving element is then withdrawn from between an under surface of the package and the welded portion of the strap. The strap-elevating member elevates the welded portion of the strap, slackened due to gentle tightening, from a point below to a point above the height of the strap-receiving element, with the result that the slackened, welded portion of the strap is held above the strap-receiving element as it returns to its original position. The strap thus does not impede the movement of the strap-receiving element.

Abstract: The present invention relates to a package strapping machine suitable for tying a package or bundle into a circular shape. A concave base supports the package in the circular shape. A synthetic resin tape is looped around the package and the base, and a leading end of the tape is held against a lower surface of the base by a clamping mechanism. The tape is then tightened, and the leading end of the tape is clamped together with a trailing end of the tape. These tape portions are then heated and pressed to weld them together, and thus the packae is tied in a circular shape. The concave base is then pivoted out from between the package and the tape. As the base pivots, stoppers adjacent the base contact portions of the tape to hold the tape and package in place and allow the base to be removed.

Abstract: A package strapping machine is provided with a tape rolling up device for rolling up excess tape drawn off of a tape reel. A package is strapped by a thermoplastic tape being drawn off of the tape reel and looped around the package. The tape reel is fixed to a rotatably supported shaft. The tape rolling up device includes a friction member surrounding the shaft, and a spiral spring has an inner end connected to the friction member and an outer end connected to a fixed point. The shaft includes a surface contacting the friction member, so that when the tape is drawn off, rotation of the shaft causes rotation of the friction member and tightening of the spiral spring. If tape continues to be drawn off after the spiral spring is completely tightened, slip occurs between the friction member and the shaft contact surface to allow the additional tape to be drawn off.

Abstract: In a package strapping machine, a plate type pivotal member is adapted to turn pivotally on a main shaft held on the base plate of the machine in parallel with the direction in which a strap is forwarded. Two clamps and a pressing device are mounted on a surface of the pivotal member and adapted to move up and down so as to be adapted to press the strap against the under surface of a lateral projection provided on the upper free end of the pivotal member. In cooperation with a sidepiece secured to the under surface of the top board of the machine, the pivotal member serves to prevent the strap from breadthwise deviation.

Abstract: An apparatus for regulating the tension of a strap wound around a package on a package strapping machine. The apparatus has a frame having a package support surface provided with a strap guiding frame into which the package is inserted and into which the strap is fed to form a strap loop around the package, a driving roller rotatably mounted on the frame for bearing against the strap and rotatable in a direction for tensioning the strap to tighten the strap around the inserted package, a press roller movable toward and away from the driving roller for holding the strap in driving engagement against the driving roller or releasing it therefrom, the press roller pressure being adjustable.

Abstract: An automated package binding apparatus and an improved method to apply thereto in the welding of a thermoplastic tape winding round a package. Said apparatus may be common to known devices of the kind in various regards but being novel at least in the equipping of one or two bimetals element therein, said bimetal making possible the adjustment of the temperature of the heaters provided for cutting and melting thermoplastic tape. The invention contemplates the preliminary heating of said heaters to around 500.degree.-700.degree. C and applying of said heaters to the cutting and melting of the tape when the temperature is lowered to a suitable temperature around 400.degree.-500.degree. C through the lapse of time after cutting off the power supply to said heaters. The preliminary heating of said heaters facilitate the diffusion of heat uniformly on the entire surface of said heaters and accordingly uniform melting of said tape.