摘要:
A power tool is provided including a housing, a brushless direct-current (BLDC) electric motor disposed inside the housing, power switches disposed between a power supply and the electric motor and including high-side switches and low-side switches, and a control unit configured to control a switching operation of the power switches to operate the electric motor and electronically brake the motor by simultaneously activating the high-side switches or the low-side switches to stop the rotation of the motor upon detection of a condition prompting the braking of the motor. The control unit is configured to detect the condition that prompts the braking of the electric motor, set a braking profile for braking the electric motor based on the detected condition, and execute braking of the electric motor using the braking profile.
摘要:
A monitoring method and device for vehicle lifters of vertical type, said method and said device being particularly adapted to ensure keeping the load levelling in said lifters. Moreover, the device object of the present invention is such as to comprise all functionalities and controls object of the certification pertaining to the standard which regulates the maximum admissible unevenness when lifting. This allows to simplify the certification procedures, indeed limiting them to the device object of the present invention rather than to the whole vehicle lifter.
摘要:
An arrangement for collision prevention is provided for an apparatus, in particular an x-ray examination apparatus, having components that can be moved by drive means. A collision is detected by way of detecting the speed of a relevant moving part and detecting the current and/or power supply to the drive means. Reference values for current and/or power supply at normal operation in dependence of the speed acquired by moving components are provided from a memory means and actually required current and/or power supplies are compared to said reference values. In addition, actual positions of components are detected and compared to computed expected positions of said components. A collision is detected when the required current and/or power supply exceeds a relevant reference value and the detected actual position deviates from the corresponding calculated expected position. As a consequence of a collision being detected, the moving component involved in a collision is detached from the drive means so as to avoid damage or injury as a cause of the collision. Apart from x-ray examination apparatus, also industrial robots which operate in circumstances where person may approach the apparatus to within the reach of moveable components are preferably fitted with an arrangement for collision protection as described above.
摘要:
A safety device used in case of rupture of a rotary shaft for preventing the shaft from rotating and for preventing broken portions thereof from falling, includes at least one safety element placed so as to retain the shaft to prevent it from falling. The peripheral surface of the shaft and a facing surface of the safety element are provided with mating devices that cooperate to prevent the shaft from rotating when a portion of the shaft is retained by said safety element due to the shaft rupturing. The device is particularly suitable for use with a shaft that winds up lifting straps for a raisable curtain or that winds up the curtain itself.
摘要:
A materials handling system in which a load is maintained in a substantially weightless condition for easy and accurate positioning. A safety lock is introduced to prevent unlocking of the system if a condition of imbalance takes place while the system is locked.
摘要:
Actuator for the release of automatic emergency brakes of hand-operated, powered tools, such as chain saws, having a driving shaft for the tool. Such emergency brakes are constituted of a brake mechanism released by means of stored energy. The actuator is constituted of a rotatable and balanced body with a small amount of friction on a shaft situated essentially parallel to the driving shaft. The actuator is fabricated of a permeable material, and has a mass having an essential inertia against rotation on the shaft. The actuator cooperates firstly with a magnet retaining the actuator with a predetermined magnetic force against rotation in an angular position of the actuator, and then with a sensor which is so arranged that an impulse for releasing the brake mechanism is given as soon as the actuator comes out of said angular position.
摘要:
A load monitoring system for force carrying members, such as pitmans of production presses, which is adapted to indicate directly in tons the loading incurred by the member during its successive operating strokes. The system further includes load limiting means having a control dial with a numerical readout which when set to a selected number causes an overload detection means to be activated when the load on the member exceeds the number of tons set on said dial. Means are provided for permitting the indicator to register the maximum load the member sustains during an overload stroke and to hold that reading indefinitely.
摘要:
A web break detector system employs web detectors arranged in groups spaced along the path of a moving web and spanning its width. Each detector which senses web for a predetermined time becomes active and an active detector in any detector group turns on a panel light associated with that group. When a detector no longer senses web because of a break or undue slack in the web, the detector generates a signal which causes the system to stop the process being monitored, indicate at which location in the path the break first occurred, indicate other locations in the path at which subsequent breaks occurred and activate web severing devices to sever the web at selected locations depending upon where the breaks occurred.
摘要:
A hydraulic actuating device has a gas generating means having a first piston slidable in a fluid tight relation therein, a given amount of self-combustible material charged in a chamber adjacent to the piston on one side thereof and an igniting means for said material; an ignition signal transmitting means to transmit an igniting signal to said igniting means; an actuating cylinder communicating with another chamber on the other side of said piston in said gas generating means and having a second piston slidable therein, with a liquid being filled between one side of said second piston and said other side of said first piston in said gas generating means; wherein said igniting means may be actuated by said signal transmitting means to ignite said selfcombustible material for applying gas pressure produced thereby to said first piston on said one side thereof, thus producing liquid pressure on said other side of the first piston which is transmitted to the actuating cylinder to actuate the second piston.
摘要:
In a press line including presses and transferfeeders provided between said presses, an interlocking device has the function such that if any over-load should be caused while said presses and transferfeeders are being interlocked and synchronously driven through a transmission driving system, the interlocking movement is simultaneously shut off, whereby breakage of the whole relative machineries can be prevented and safety thereof can be secured.