| 摘要 |
A tube bending machine having a rotatable bend die, a pressure die, a clamp die, an actuator and a controller. A clamp assembly holds the clamp die and includes a base, a clamp die holder which is spring biased away from and slideably engageable with the base. A spacer is also attached to the base and is moveable between positions. A gear rotatably mounted to the base is attached to a first and second cam by a shaft and the gear moves on a rack. The first cam is followed by a cam follower which moves to allow the spacer to change positions. The clamp die holder may move toward the housing in case the clamp die engages an obstruction, thus avoiding damage or injury to the obstruction. A second position of the spacer substantially blocks the space between the clamp die holder and the base, thus making a substantially rigid connection between them. The second position is used during the tube bending process. A microswitch senses the clamp die holder position and stops or opens the clamp die holder assembly if an obstruction is present. A set up mode is also provided by disengaging the gear from the rack and moving the spacer to the second position.
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