| 摘要 |
A tube bending machine including a frame with a bed at one end pivotally supporting a horizontally swingable bending table bearing tube bending and clamping mechanism, including a jaw for clamping tube stock against a tube bend forming and clamping die secured coaxially at the table pivotal connection; a tube feed carriage with a rotatable tube-clamping collet for a tube to be fed to, clamped and bent at the die, the tube carriage being guided on the bed to shift to and from the said die, and free to advance during a bending operation by powered swing of the table; the die periphery having a partially circumferentially extending tube-forming groove concentric to and with groove centerline in a plane perpendicular to the pivot axis; the die and jaw each being turnable relative to the table selectably to present to each other cooperating straight grooves or cooperating curved grooves for clamping straight or curved length portions of tube to be bent, including also clamping grooves curving out of the plane of the forming groove; the said grooves being complementary in cross section to the semi-circumference of tube; the clamping grooves of the die leading tangentially into the tube-forming groove; with manual and powered shifting of the die and jaw disclosed; whereby, without removing a tube from the machine, successive bends may be produced in a tube with or without an intervening straight portion, and in the same or different planes. |
