| 摘要 |
A method and apparatus is provided for securing together overlapping portions of a thermoplastic strap loop around an object. After the strap is fed to form the loop, the upper strap portion is restrained while pulling the strap trailing portion to tension the loop. Lengths of the upper and lower strap portions are then gripped together in face-to-face contact to hold the loop in tension. The trailing portion is severed from the loop lower strap portion, and the restraint of the upper strip portion is terminated. A heating member is extended between the upper and lower strap portions in a direction generally parallel to the strap length. The upper and lower strap portions are pressed against the heating member to melt regions of the strap. The heating member is withdrawn, and the melted regions are pressed together as the melted regions solidify to form a joint. Included in the apparatus are coacting first and second gripper means, an anvil, a cutter, and a heating member. One of the gripper means defines a strap length receiving region below at least a portion of the gripping means for accomodating the lower strap portion prior to severing the trailing portion of the strap. |
