| 摘要 |
A machine bed supports stationary and rotary fixing means that are aligned for receiving bar stock therebetween. Electrical or electromechanical control means are provided for selecting and effecting, via a motor-driven step-down gear, exactly a predetermined amount of rotation of the rotary fixing means. Various detachable matching pieces hold opposite portions of the bar stock within the stationary and rotary fixing means, respectively, while the material is worked. Openings in the matching pieces positively fit the bar stock. The outer contour of the matching pieces permits insertion in the stationary and rotary fixing means for positive fit therein. A preferred embodiment of the apparatus serves the purpose of cold twisting square steel bars either singly or, for obtaining volutes, in bunches. Removal of worked bar stock is facilitated by a handwheel enabling the operator to manually counter-rotate the rotary fixing means by a selected small angle. A slide may be mounted on the machine bed for supporting two bending rollers whose position relative to each other and to a pulling roller engaged in the rotary fixing means can be adjusted as required for feeding and working bar stock between the bending and pulling rollers. For twirling the bar stock, a disk device carrying a plying tool and a self-locking excenter may be inserted in the rotary fixing means.
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