A conveyance apparatus includes two clamp mechanisms. Each of the clamp mechanisms is configured to freely change its state among a fully clamping state, a semi-clamping state, and a non-clamping state. When an object is delivered from a first clamp mechanism that is holding the object to a second clamp mechanism, the second clamp mechanism is brought into the semi-clamping state to temporarily hold the object. Then, the first clamp mechanism is brought into the non-clamping state and the second clamp mechanism is brought into the fully clamping state.

A machining apparatus includes a first frame including a first surface formed along a Z-axis direction and a second surface formed along a Y-axis direction. An X-axis moving mechanism and a Z-axis moving mechanism are disposed on the first surface side of the first frame. A Y-axis moving mechanism is disposed on the second surface side of the first frame. A second frame supports the first frame from the second surface side of the first frame. An A-axis rotating mechanism, a B-axis rotating mechanism, and a supporting mechanism that supports an object to be machined are moved by the Y-axis moving mechanism. The t Y-axis moving mechanism is disposed in a space located below the first frame in the Z-axis direction, and formed by the second flame.

Provided is an apparatus for detecting a failure in holding a tool of a machine tool that includes, in each of a plurality of tool holding mechanisms in a tool magazine, a locking member provided to have different self-displacement positions for a case where a tool is held at a proper held position between tool gripping portions of a pair of holding arms and a case where the tool is held with deviation from the proper held position, and that detects a holding failure state of the tool in the tool holding mechanism by detecting the position of a detection target portion that moves integrally with the locking member with a predetermined detector provided in the machine tool. The apparatus makes it possible to effectively prevent a risk of a breakdown of and damage to the machine tool.

A motor spindle having a first electromagnetic drive system including a stator unit and a rotor unit which can rotate about an axis of rotation and has at least one rotor shaft and a tool receiver for receiving a machining tool. At least one bearing unit provides rotationally mounting of the rotor unit in the stator unit. The tool receiver is arranged in an end region of the rotor unit. The stator unit has a stator housing with an end section arranged in the end region of the rotor unit. The stator unit comprises at least one motor, having a second electromagnetic drive system, with a stator and a rotational rotor, wherein the rotor has at least one rotational housing element of the end section of the stator unit.

A technique for detecting the completion of work of attaching a workpiece to a pallet is provided. A pallet transport system includes: a transport device for transporting a pallet to which a workpiece can be attached; a pallet housing unit for housing the pallet, a workstation in which a worker is to conduct work of attaching the workpiece to the pallet transported from the pallet housing unit; a machine tool for machining the workpiece attached to the pallet in the workstation; and a control device for controlling the transport device. The control device acquires an indicator indicating progress of the attachment work in the workstation, determines whether or not the attachment work has been completed based on the indicator, and when it is determined that the attachment work has been completed, transports the pallet located in the workstation to the pallet housing unit or the machine tool.

There is proposed a method for examining the clamping state of a tool holder or tool which is clamped in a tool clamping device of a rotor unit of a motor-driven machine tool unit, with the spacing of the sensor head from a component of the rotor unit being measured, with a recording of at least one time and/or position-related sequence of the spacing values measured with the sensor head, wherein for improved integration of the method the recording of a first and a second time and/or position-related sequence is carried out during an acceleration of the rotation of the rotor unit with respect to the stator unit, in particular when the rotor unit is started up, wherein the time and/or position-related information of the sequence vectors of the first and/or second sequence is scaled using the respective associated current speed (v.sub.0).

A tool-mounting-state estimation system includes: a measuring tool including a body section having a tapered external surface common with a tapered external surface of a tool and a vibrating source that is mounted on the body section and that generates vibration; a sensor that is provided on a spindle for drawing the measuring tool thereinto so that the tapered external surface of the measuring tool comes into close contact with a tapered internal surface of the spindle and that detects the vibration generated by the vibrating source when the vibration propagates towards the spindle via the tapered external surface and the tapered internal surface; and an estimation unit for estimating a mounting state of the tool on the basis of the vibration detected by sensor.

A method wherein by reducing the amount of current, and therefore torque, to the linear servo motor (50) and/or rotary servo motor (52) of a loader mechanism (9), the loader mechanism is operable for determining proper workpiece positioning in a machine tool such as a gear manufacturing machine, particularly a machine (4) for manufacturing bevel and hypoid gears

A device for simultaneously measuring and adjusting the tool holding portion of a spindle. The device has a body defining a datum surface providing a magnetic portion and an indicator portion. A socket extends from the magnetic portion, the socket dimensioned and adapted to receive and seat a first component of the tool holding portion on the magnetic portion. A compressible indicator tip extends in an outward-biased manner from the indicator portion, wherein a distance from the distal end of the indicator tip and the indicator portion of the datum surface is displayed along the body.

A machine tool for machine processing workpieces by using a tool having a pull stud at a proximal end portion thereof. The machine tool includes a tool magazine having a number of tool holders each of which is capable of attaching and detaching the tool, a spindle which holds the tool at the time of machine processing the workpieces, and a controller which determines whether or not the pull stud is appropriate on the basis of detected data of a visual sensor which is provided inside or outside the machine tool, and which captures images of the pull stud of a tool holder of the tool, or detected data of a sensor which is provided inside the tool magazine, and which measures length, electric resistance, or electric capacity of the pull stud.