Abstract: A position control device for a servomotor in use of a NC machine tool, a robot or the like detects a case that a control shaft is collided with something in error to stop the servomotor at a high speed so as to minimize damages of the machine. When an estimated disturbance torque estimated by a disturbance torque observer 9 is over an allowance disturbance torque, an alarm signal is outputted. At this point, a plugging control unit 11 outputs a braking torque current command in a direction of stopping the servomotor until the servomotor 5 is stopped. An operation mode determination unit 12 receives an operation mode of the machine during the operation to set the allowance disturbance torque corresponding to the operation mode to the determination unit 10. According to the present invention, the detection of the collision of the machine 6 can be performed at higher speed and a braking distance after the detection so that damages of the machine during the motor rotates at a high speed can be minimized.

Abstract: Obliquely cohered fasteners may be formed by adhering wires with an adhesive coating to form a strip. The strip is then shaped so that the wires are formed into fasteners of the desired shape. The adhesive coating is then plasticized and while plasticized, each fastener is offset from the next to obtain the obliquely cohered fasteners. Then, the adhesive coating is rehardened. Instead of applying a single adhesive coating, the wires may be adhered with a first thermoplastic coating and a second coating of a non-self-adhesive resin. The second coating may be applied only to that portion of the first coating covering the fasteners. Alternatively, as the fasteners are offset, the second coating may be cracked between fasteners to weaken the second coating, allowing the fasteners to be more easily separated when desired. The off-setting may be performed by a device which applies a force to one of the ends of the fasteners while the other of the ends of the fasteners are displaced.