Production tube bending machine

In a tubing bending machine including a linear fluid pressure operated actuator having an operating rod, a rotatable die table with a top adapted to support a die, a die with a bottom adapted to rest on said table, a tubing clamp, and a wiper block to bend a tubing workpiece, the improvement comprising,

• a sprocket secured to rotate with said die table and clamp,
• a chain wrapped partially around said sprocket and having one end secured thereto;
• the other end of said chain being secured to the operating rod of said actuator,
• a clamp with an operating lever for clamping a wiper block in position,
• a valve with a pressure output and operated by the lever of said clamp, said valve pressure output being connected to provide a fluid pressure signal to control said actuator to cause rotation of said bend die, and
• a torsion spring connected to said sprocket to rotate said sprocket in a direction to apply tension to said chain.

In a tubing bending machine including a linear actuator having an operating rod, a rotatable die table with a top adapted to support a die, a die with a bottom adapted to rest on said table, a tubing clamp, and a wiper block to bend a tubing workpiece the improvement comprising,

• a sprocket secured to rotate with said die table and clamp,
• a chain wrapped partially around said sprocket and having one end secured thereto;
• the other end of said chain being secured to the operating rod of said actuator,
• a pilot valve with a pressure output connected to provide a fluid pressure signal to control said actuator to cause return rotation of said bend die by said spring,
• a workpiece ejection actuator having an armature,
• a universally adjustable clamp for positioning the said ejection actuator so that its armature will strike a workpiece to dislodge it from said die,
• means for coupling said pilot valve to said workpiece ejection actuator, and
• a torsion spring connected to said sprocket to rotate said sprocket in a direction to apply tension to said chain.

In a tube bending machine including a linear actuator having an operating rod with an abutment, a rotatable die table with a top adapted to support a die, a die with a bottom adapted to rest on said table, a tubing clamp, and a wiper block to bend a tubing workpiece, the improvement comprising,

• a generally circular member secured to rotate with said die table and clamp,
• a flexible inextensible element wrapped partially around said circular member and having one end secured thereto;
• the other end of said element being secured to the operating rod of said actuator,
• a spring connected to said circular member to rotate it in a direction to apply tension to said element,
• an adjustable stop in the path of said operating rod abutment,
• a pointer which moves with said stop,
• a scale against which the position of said stop is indicated by said pointer,
• at least one projection on said top of said die table mating with a depression in said bottom of said die,
• a draw bolt with a threaded upper end and a lower end, and
• a hand wheel secured to the lower end of said draw bolt, said draw bolt extending upwardly through said member and said die table and adapted to threadedly engage a tapped hole in the bottom of said die and secure it to said table.