Driving system for open-end spinning machines, in particular of open-end spinning rotors, in which the power necessary for the driving of said rotors is distributed between two electric motors situated at the head and tail-end of the spinning machine, with a common belt transmission, the rotation of the tail-end motor being subordinate to the rotation of the motor at the head.
Description
FIG. 1 illustrates the scheme of an open-end spinning unit in its most significant components.
FIG. 2 shows a driving scheme of the rotors of an open-end spinning machine of the conventional type, to illustrate its problems and technical limits.
Claims
1. A driving system for open-end spinning machines, in particular of the rotors (8) of a front of an open-end spinning machine, characterized in that the power necessary for the driving of the spinning rotors is distributed between two electric motors (51, 51′) respectively situated at the top-end (51) and tail-end (51′) of the spinning machine, by transmission by means of a common driving belt (55) of the rotors (8), the rotation of the motor (51′) being subordinated to the rotation of the motor (51).
2. The driving system for open-end spinning machines according to claim 1, characterized in that, downstream of the main pulley (54) moved by the motor (51) at the top-end, the belt (55) reaches the idle reference pulley (57) for the whole driving, an encoder (58) being positioned thereon, for indicating the linear rate of the driving belt (55) of the rotors, and on the basis of the values indicated by the encoder (58), the control unit (59) of the machine controls and drives both the motor (51) at the top-end and also the motor (51′) situated at the tail-end of the spinning machine.
3. The driving system for open-end spinning machines according to claim 2, characterized in that the motors (51, 51′) are asynchronous electric motors and are controlled and driven by the control unit (59) of the machine by means of the inverters (60, 60′).
4. The driving system for open-end spinning machines according to claim 2, characterized in that the driving inverter (60) of the asynchronous motor (51) at the top-end is in fact connected with the driving inverter (60′) of the asynchronous motor (51′) at the tail-end with a transmission line (62) of an impulse synchronism signal between the two inverters (60, 60′) which drive the motors (51, 51′), the rotation of the motor (51′) being subordinate to the rotation of the motor (51).
5. The driving system for open-end spinning machines according to claim 1, characterized in that on the lower branch of its run, the belt (55) transmits the rotation torque to the legs (67) of the spinning rotors (8) intervalled by thread-tensioner guide pulleys (68).
6. The driving system for open-end spinning machines according to claim 1, characterized in that the common transmission to the belt is used for the driving of the cards (7).
Patent Application
20070204592
