The invention relates to a control method for a quick change device of a work tool, comprising the steps of: receiving a command to disengage a work tool clamping device; determining whether the work tool clamping device is in an engaged state; detecting functionality of a disengagement alarm if the work tool is in the engaged state; switching to an emergency state upon the detection of failure of the disengagement alarm. The present invention further relates to a corresponding control apparatus and work machine.

A gear manufacturing machine for which a machining tool detachably attached to a tool spindle is exchanged by means of an automatic tool changer, wherein the automatic tool changer is provided with: tool holding means for detachably holding a machining tool to be exchanged; moving means for moving the tool holding means in a direction parallel to the axial direction of the tool spindle; and rotating means for rotating the tool holding means.

A machine tool device in one embodiment is configured to provide open-loop and/or closed-loop control of at least one machine tool function of a portable machine tool. The machine tool device includes at least one detection unit configured to detect at least one characteristic variable of the machine tool and/or of a processing tool arranged on the machine tool. The machine tool device further includes at least one brake unit, wherein at least one brake function of the brake unit is adapted at least partially automatically, and in particular dynamically, depending on the at least one detected characteristic variable.

A machine tool including a fixed cover and a movable cover for covering at least part of a machining region includes a cover control device that includes a driving circuit for driving the movable cover, an abnormality detection device that detects an abnormality while the movable cover is driven, a self-diagnosis device that performs evaluation on whether the abnormality detection device is normal, and an output device that outputs a result of the evaluation by the self-diagnosis device. The self-diagnosis device is configured to perform the evaluation on whether the abnormality detection device is normal based on an operating state of the abnormality detection device at a time when a pseudo abnormality is generated on the movable cover by driving the movable cover via the driving circuit.

A handheld power tool 10 includes a detection signal acquisition unit 31, a determination unit 32, a display unit 24, a display control unit 34, a motor 14, and a drive control unit 13. The detection signal acquisition unit 31 acquires a detection signal that changes according to the detection strength of rebar W1 in concrete W. The determination unit 32 determines the presence or absence of the rebar W1 based on the acquisition result acquired by the detection signal acquisition unit 31. The display unit 24 displays the presence or absence of the rebar W1 by turning on different lights. The display control unit 34 controls so as to switch the color of the light displayed on the display unit 24 on the basis of the determination result by the determination unit 32. The motor 14 rotationally drives a tip tool 18a that works the concrete W. The drive control unit 13 controls the drive of the motor 14.

An electronic tool monitoring system to monitor usage and wear of tools for mechanical machining, comprising, for each tool to be monitored, a tag with a unique identifier and a self-contained, stand-alone electronic monitoring device. The electronic monitoring device comprises: an electronic sensory arrangement; an electronic communication interface; an electronic operator; and an electronic control unit. The electronic communication interface and the electronic operator interface are programmed to store data indicative of a service life of the tool, identify and monitor usage and wear of the tool based on an output of the electronic sensory arrangement, and estimate residual service life of the tool based on monitored usage and wear of the tool and the stored data indicative of service life of the tool. The system will implement certain actions based on whether the service life of the tool is determined to be exhausted.

A machine tool operation monitoring system which detects an abnormal operation of a machine tool 1 and in which when the operation of each machine tool 1 exceeds a normal operating range of each machine tool 1 and/or when a moving state of a constituent portion of the machine tool 1 and a material exceeds a normal range, wherein the machine tool 1 breaking out an operation abnormality is identified by any one of the following operations:

a. monitoring an image obtained by projecting reflected light from a reflecting display plate 22 provided for each machine tool 1 onto a camera 31; and
b. monitoring a difference in projecting direction of emitted light from a lamp 21 provided for each machine tool 1 onto an optical sensor 32.

A machine tool operation monitoring system which detects an abnormal operation of a machine tool 1 and in which when the operation of each machine tool 1 exceeds a normal operating range of each machine tool 1 and/or when a moving state of a constituent portion of the machine tool 1 and a material exceeds a normal range, wherein the machine tool 1 breaking out an operation abnormality is identified by any one of the following operations: a. monitoring an image obtained by projecting reflected light from a reflecting display plate 22 provided for each machine tool 1 onto a camera 31; and b. monitoring a difference in projecting direction of emitted light from a lamp 21 provided for each machine tool 1 onto an optical sensor 32.

A power tool includes a control for the motor of the power tool that senses an operating characteristic of the motor and controls the operation of the power tool based on the sensed characteristic. The sensed characteristic includes variations in reluctance of the motor. A controller may sense changes on load on the motor as a result of interaction between a working element such as a saw blade or drill bit and the work piece. The controlled operation may include variation in speed or torque or both, or may include stopping the motor. Emergency conditions may be sensed by changes in reluctance.

A method of monitoring a tool clamping device mounted on a machine spindle, the clamping force of which tool clamping device is generated by a spring assembly which exerts a force in the direction of the clamping position on an actuating element actuating the clamping or the release of a tool or tool holder. In the method, the spring force and the displacement of the actuating element are continuously measured during the release and/or clamping of a tool or tool holder and recorded as functions of the time. These recorded functions are used to identify at least one parameter characteristic for the status of the tool clamping device. Based on the spring force and the displacement over time, a spring characteristic curve is plotted in the form of the spring force as a function of displacement, the analysis of which spring characteristic curve provides information about a number of characteristic parameters.