A work-piece transfer apparatus, comprising at least one work-piece engagement structure; at least one first robot arm pivotally connected to the work-piece engagement structure; a first motor coupled to the first robot arm and being adapted for translating the first robot arm fore and aft in a generally horizontal direction; a second motor, at least one second robot arm being in operating driving relationship with the second motor and operatively coupled with the work-piece engagement structure for raising and lowering the work-piece engagement structure; and a support structure for supporting the apparatus or portions thereof; wherein the first motor and second motor are operated synchronously to raise, lower, and/or translate the work-piece engagement structure in a fore and aft direction by way of one or both of the first robot arm and second robot arm.

A grinding apparatus includes: a pair of rotary grindstones, a rotary base rotationally driven around a first rotation axis, a rotary table included in the rotary base, a fixed base rotatably supporting the rotary base, a fixed table included in the fixed base, a plurality of workpiece supporting tables supported on the rotary base and rotationally driven around a second rotation axis, a plurality of workpiece receiving holes vertically passing through an outer edge part of the workpiece supporting tables, a first motor fixed to the fixed base to rotationally drive the rotary table, a plurality of second motors fixed to the rotary base to rotationally drive the workpiece supporting tables, a controller driving the first motor and the plurality of second motors, and a slip ring disposed below the plurality of second motors and conductively connecting between the controller and the plurality of second motors.

A work-piece transfer apparatus, comprising at least one work-piece engagement structure; at least one first robot arm pivotally connected to the work-piece engagement structure; a first motor coupled to the first robot arm and being adapted for translating the first robot arm fore and aft in a generally horizontal direction; a second motor; at least one second robot arm being in operating driving relationship with the second motor and operatively coupled with the work-piece engagement structure for raising and lowering the work-piece engagement structure; and a support structure for supporting the apparatus or portions thereof; wherein the first motor and second motor are operated synchronously to raise, lower, and/or translate the work-piece engagement structure in a fore and aft direction by way of one or both of the first robot arm and second robot arm.

A machine tool is disclosed. The machine tool includes a robot which is compact and which enables easy use of different end effectors for respective purposes. An internal robot includes a plurality of joints that are composed of a base joint and parallel joints, and a plurality of links. The distal end is split into two or more branches, each having a tool changer. An end effector is detachably attachable to each of the tool changers. Rotation of the base joint causes a change between a first tool-following position and a second tool-following position, so that different end effectors are used for respective purposes by using an end effector attached to a tool changer in the first tool-following position and using an end effector attached to another tool changer in the second tool-following position.

A work-piece transfer apparatus, comprising at least one work-piece engagement structure; at least one first robot arm pivotally connected to the work-piece engagement structure; a first motor coupled to the first robot arm and being adapted for translating the first robot arm fore and aft in a generally horizontal direction; a second motor, at least one second robot arm being in operating driving relationship with the second motor and operatively coupled with the work-piece engagement structure for raising and lowering the work-piece engagement structure; and a support structure for supporting the apparatus or portions thereof; wherein the first motor and second motor are operated synchronously to raise, lower, and/or translate the work-piece engagement structure in a fore and aft direction by way of one or both of the first robot arm and second robot arm.

A machine tool for machining a workpiece has a spindle arm with a spindle for receiving a tool or workpiece. The spindle arm is movably attached to a spindle arm receiving section. The spindle arm has a first spindle arm section, being a longitudinal element, having a first rotational axis with respect to the spindle arm receiving section and is hinged to the spindle arm receiving section; a second spindle arm section, rotatable about a second rotational axis with respect to and is hinged to the first. The spindle arm receiving section has a first subsection and a second subsection, arranged on the machine column at a distance from one another to receive the spindle arm. The first spindle arm section has first and second subsections, which are arranged on the spindle arm receiving section at a distance from each other to receive the second spindle arm section.

A work-piece transfer apparatus, comprising at least one work-piece engagement structure; at least one first robot arm pivotally connected to the work-piece engagement structure; a first motor coupled to the first robot arm and being adapted for translating the first robot arm fore and aft in a generally horizontal direction; a second motor; at least one second robot arm being in operating driving relationship with the second motor and operatively coupled with the work-piece engagement structure for raising and lowering the work-piece engagement structure; and a support structure for supporting the apparatus or portions thereof; wherein the first motor and second motor are operated synchronously to raise, lower, and/or translate the work-piece engagement structure in a fore and aft direction by way of one or both of the first robot arm and second robot arm.

A device for machining a surface of a workpiece includes a workpiece holder configured to rotate the workpiece about a workpiece rotational axis, a tool having a tool rotational axis and at least one blade having a blade radius of curvature and a tool holder configured to position the tool such that an active point of the blade comes into engagement with the workpiece and configured to pivot the tool about the tool rotational axis and to configured to move the tool with an advancing motion such that the active point of the blade shifts along the blade. The advancing motion is defined by a curve having at least a first radius of curvature and a second radius of curvature.

A work-piece transfer apparatus, comprising at least one work-piece engagement structure; at least one first robot arm pivotally connected to the work-piece engagement structure; a first motor coupled to the first robot arm and being adapted for translating the first robot arm fore and aft in a generally horizontal direction; a second motor; at least one second robot arm being in operating driving relationship with the second motor and operatively coupled with the work-piece engagement structure for raising and lowering the work-piece engagement structure; and a support structure for supporting the apparatus or portions thereof; wherein the first motor and second motor are operated synchronously to raise, lower, and/or translate the work-piece engagement structure in a fore and aft direction by way of one or both of the first robot arm and second robot arm.

A work-piece transfer apparatus, comprising at least one work-piece engagement structure; at least one first robot arm pivotally connected to the work-piece engagement structure; a first motor coupled to the first robot arm and being adapted for translating the first robot arm fore and aft in a generally horizontal direction; a second motor; at least one second robot arm being in operating driving relationship with the second motor and operatively coupled with the work-piece engagement structure for raising and lowering the work-piece engagement structure; and a support structure for supporting the apparatus or portions thereof; wherein the first motor and second motor are operated synchronously to raise, lower, and/or translate the work-piece engagement structure in a fore and aft direction by way of one or both of the first robot arm and second robot arm.