Patent ID: 7661285
Filing Date: 2010-02-16
Classification: B21C

Abstract:
1. A drawing machine comprising: a first plate having first and second surfaces; a clamping device installed on the first surface of the first plate; a transmit member including first and second ends; a following roller rotatably mounted to the transmit member between the first and second ends, with the first end of the transmit member pivotally connected to the second surface of the first plate about a first pivot axis perpendicular to the second surface of the first plate, with the following roller rotating about a rotatable axis parallel to and spaced from the first pivot axis; a driving device interconnecting the second end of the transmit member and the clamping device; wherein the transmit member pivots with respect to the driving device; wherein the driving device moves reciprocatingly with respect to the first plate; and a cam including a first cam path and a second cam path, with the first cam path disposed between two sides of the second cam path; wherein the following roller is located in the first path, with the cam movable relative to the following roller between a first position and a second position, wherein when the cam is in the first position, the distances between the following roller located in the first cam path and the two sides of the second cam path are different; wherein when the cam is in the second position, the distances between the following roller located in the first cam path and the two sides of the second cam path are equal; with the second end of the transmit member driving the driving device so that the clamping device is driven to clamp a rod or pipe, and with the first plate driven by the second cam path for reciprocating along the cam axially.