Abstract: A ring encircles produce placed on a work table. Tie ribbon is fed by pressure rollers around the inner periphery of the ring to form a complete loop. A first gripper clamps and retains the free end of the ribbon against a second gripper. The pressure rollers operate in reverse retracting excess ribbon about the produce. A friction clutch, operative only for reverse ribbon feeding, allows for ribbon slippage as the ribbon tightens around the produce. Then the second gripper clamps the other end of the ribbon against a twister head and a twister mechanism rotates the clamped ends of the ribbon about a common axis twisting the ribbon ends together. Shearing edges sever the engaged ribbon from a ribbon supply during twisting. The grippers and twister mechanism are at ends of the concentric support rods and tubes, and the grippers in clamping move along the rotational axis of the twister mechanism.

Abstract: A ring encircles produce placed on a work table. Tie ribbon is fed by pressure rollers around the inner periphery of the ring to form a complete loop. A first gripper clamps and retains the free end of the ribbon against a second gripper. The pressure rollers operate in reverse retracting excess ribbon about the produce. A friction clutch, operative only for reverse ribbon feeding, allows for ribbon slippage as the ribbon tightens around the produce. Then the second gripper clamps the other end of the ribbon against a twister head and a twister mechanism rotates the clamped ends of the ribbon about a common axis twisting the ribbon ends together. Shearing edges sever the engaged ribbon from a ribbon supply during twisting. The grippers and twister mechanism are at ends of concentric support rods and tubes, and the grippers in clamping move along the rotational axis of the twister mechanism.

Abstract: In a wire twisting machine in which the ends of the tie wire are clamped while these ends are being twisted together to complete the tying of the product, there is proposed improved clamps which, unlike prior art clamps that have clamping strokes of a prescribed dimension, are actuated by pressure air in such manner that the clamping strokes thereof are terminated only when the clamping rods actually abut against their cooperating anvil or wire holding surfaces. Thus, wear or looseness of fit which may subsequently occur in the components of the machine do not adversely affect the clamping service or function of the clamping rods.