Abstract: The present invention is related to an automatic tool-changing mechanism adapted to be used in a machining center and including a power source, a machine frame and an automatic tool changing device secured to the machine frame, wherein the automatic tool changing device includes a tool changer secured to the machine frame for functioning in tool-grasping, tool-extracting, tool-interchanging, tool-inserting and tool-returning motions; a rotating device secured to a driving shaft and coupled to the tool changer and a swing arm device, the rotating device including a first and second rotating elements in which the first rotating element is used for enabling a to-and-fro swing motion of the swing arm device and the second rotating element is used for enabling a to-and-fro rotary motion of the tool changer to perform the tool-grasping, tool-interchanging and tool-returning motions; and the swing arm device having an intermediate portion thereof pivotally coupled to the machine frame and a first end portion and a s

Abstract: An automatic tool changer in a machining enter includes a reducer, a compound cam, a cylindrical cam, a four-bar mechanism, a toggle mechanism, and a tool cahnge device. The compound cam and the cylindrical cam are driven by a motor after speed reduction through a belt and gear train. The compound cam includes a roller gear cam and a face cam performs the tool change motions. During the tool change motions, the cylindrical cam drives the crank of the toggle mechanism to make the slider push the drawback which produces the pushing and pulling tool motions in the spindle head. By way of using this design, the tool change time is largely reduced, the tool change motions are more smooth, and the cost can be cheaper than the previous design.

Abstract: Disclosed is a tool clamping mechanism for use in a machining center, which includes a pivoting member having at opposite ends a pair of fingers for grasping a tool, the pair of fingers being connected by means of a hinge, a rotating block fixedly mounted on a shaft so as to be rotated clockwise and counter-clockwise in a given range by the shaft, the rotating block being rotatably positioned in the center of the pivoting member, a pair of sliders for respectively pushing and pulling the pairs of fingers to open or close, a pair of rotating block links for respectively connecting the rotating block with the pair of sliders, a pair of slider links for connecting each of the sliders with each pair of fingers, and an actuating means for rotating the shaft and thus rotating block, wherein the rotating block is rotated to push or pull the pair of sliders so as to open or close the pairs of fingers through the cooperation of the links.

Abstract: A machine tool comprises a travelling column, a spindle stock to be displaced on the travelling column, and a tool magazine. Toolholders are stored in the tool magazine and may be individually conveyed into a transfer position within the tool magazine. Two gripper arms serve to interchange the toolholders between the transfer position on the tool magazine and a working position in the spindle. The orientation of the toolholders during interchanging is maintained. The gripper arms are separately mounted on the spindle head and can be pivoted simultaneously and in opposite directions along locus curves. The gripper arms have grippers to hold the toolholders during the interchanging between the transfer position and the working position. The transfer position and the working position lie in a common vertical plane. The transfer position is located in the area of the travelling column front side facing toward the spindle stock.

Abstract: Herein disclosed is an exchange arm drive control system which is adopted as the automatic tool exchanger of a vertical quadruple spindle type machining center and enabled to contribute to sparing the space and improving the machinability. The drive control system is comprised mainly of means for clamping a tool and moving a tool holder in a Z-axis, means for rotating the tool holder by 180 degrees, means for turning exchange arms by 90 degrees and controlling the position of the tool holder; and means for moving the exchange arms on a Y-axis. Especially, in the 90-degree exchange arm turning and tool holder positioning means of those means, there is adopted a hollow shaft (16) for keeping a rotary shaft (2) away from associating with the 90-degree turn of the exchange arm (11) so that the tool can be conveyed with the tool holder being held in a constant position.

Abstract: A machining center having a bed that supports a work table, a carriage movable along the bed, an upright column moveable across the carriage, a machining head movable vertically on the upright column and a tool magazine with a tool changer. The bed is designed as an inclined bed with a downward slope toward the rear and the work table is mounted on the front side of bed by means of a suitable console.