Abstract: A sawtooth wire to be laid in a groove of a shredding-element-carrier of a disintegrating roll of an open-end spinning apparatus is brought into a shape, which essentially represents that shape, which the sawtooth wire is to assume on the shredding-element carrier. The sawtooth wire is preshaped on a dummy body, the circumference of which predominately conforms to that of the shredding-element carrier, or the sawtooth wire is directly preshaped on the shredding-element carrier of the disintegrating roll. The preshaped sawtooth wire is subsequently hardened, preferably inductively with the aid of a high frequency alternating current with a frequency of more than 1000 kHz. In this manner, a disintegrating roll is made, the abrasion resistant shredding element of which, after the preshaping, i.e., after is securement on the shredding-element carrier, is a hardened shredding element.

Abstract: A sawtooth wire (20) to be laid in a groove of a shredding element-carrier (10) of a disintegrating roll (1) of an open-end spinning apparatus, is brought into a shape, which essentially represents that shape, which the sawtooth wire (20) is to assume on the said shredding-element carrier (10). The sawtooth wire (20) is preshaped on a dummy body, the circumference of which predominately conforms to that of the shredding-element carrier (10), or the sawtooth wire is directly preshaped on the said shredding-element carrier (10) of the disintegrating roll (1). Only subsequently, is the preshaped sawtooth wire (20) hardened, preferably inductively with the aid of a high frequency alternating current with a frequency of more than 1000 kHz. In this manner, a disintegrating roll (1) is made, the abrasion resistant sawtooth wire (20) of which, after the preshaping, i.e., after its securement on the shredding-element carrier (10), is a hardened, especially inductively hardened steel wire.

Abstract: For a separating roll, which finds application on an open end spinning machine, the proposal is made that a spiral trim wire be preformed and precoated before the trim wire is installed upon the circumference of the roll. In this way, separating rolls of the most varying materials may be employed since the rolls themselves need not undergo the coating process. Further, the trim wire may be preformed into a spiral before fitting on the separating roll. Moreover, a process for the production of the trim wire is presented. During the process of coating, the preformed spiral windings are held at an axial distance from one another.

Abstract: To attach spinning rotors to their rotor shaft, the rotor shaft is provided with a stop against which the collar for the seating of the spinning rotor bears. The stop can be made in one piece with the rotor shaft, and be in the form of a micro-stop against which the collar bears in an axial direction.