Rewinding machine and method for controlling the speed of the motors in a rewinding machine
AssigneeA. Celli Paper S.P.A.
InventorFranco Sforzi
Life of this patent
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Abstract
The rewinding machine (1) comprises: a winding station (3) with winding members (5, 7) operated by winding motors (8.1, 8.2); an unwinder (31.1, 31.2) with an unwinding member (35.1, 35.2) operated by at least one unwinding motor (38.1, 38.2); guide roller (43.1, 43.2) along a feed path (P) of the web material (N, N2). There is associated with the guide roller (43.1, 43.2) at least one load sensor (42.1, 42.2), adapted to detect a parameter proportional to the tension of the web material (N; N2) guided around the guide roller (43.1, 43.2). There is also provided a control unit (71) adapted to modulate a difference in speed between the winding members (5, 7) and the unwinding member (35.1, 35.2) as a function of a signal coming from the load sensor (42.1, 42.2).
Claims20
A rewinding machine for unwinding primary reels of a web material and rewinding said web material in secondary reels, comprising:
- a winding station with winding members operated by at least one winding motor;
- at least one unwinder with at least one unwinding member operated by at least one unwinding motor;
- at least one guide roller along a feed path of the web material;
- at least one load sensor associated with the guide roller, the load sensor being configured to detect a parameter proportional to the tension of the web material guided around the guide roller;
- and
- a control unit adapted to modulate a difference in speed between the winding members and the unwinding member as a function of a signal from the load sensor.
A method for rewinding a web material, comprising the steps of:
- unwinding a primary reel of web material comprising at least one ply of tissue paper by at least one unwinding member controlled by an unwinding motor;
- winding the web material in a winding station by at least one winding motor and forming at least one secondary reel in the winding station;
- detecting a parameter function of the tension of the web material along the path between the unwinding member and a winding station;
- controlling the difference between the speed of the winding motor and of the unwinding motor as a function of said parameter;
- inserting at least one winding core into the winding station;
- performing an acceleration ramp of the web material coming from the primary reel in the unwinder from an initial speed to an operating speed while winding the web material in the at least one secondary reel in the winding station;
- performing winding of the web material around said at least one winding core at the operating speed;
- performing a deceleration ramp from the operating speed to a final speed;
- interrupting the web material;
- and
- removing said at least one secondary reel from the winding station.
A start-stop tissue paper rewinding machine for unwinding primary reels of a tissue paper web material and rewinding said web material in secondary reels through successive winding cycles spaced by stops for replacement of the secondary reels with new winding cores, the start-stop tissue paper rewinding machine comprising:
- a winding station with winding members operated by at least one winding motor;
- at least two unwinders, each unwinder of the at least two unwinders comprising at least a respective unwinding member operated by at least one respective unwinding motor;
- for each of the at least two unwinders, at least one respective guide roller along a feed path of the web material unwound from the respective unwinder;
- at least one respective load sensor associated with each guide roller, the sensor being adapted to detect a parameter proportional to the tension of the respective web material guided around the guide roller;
- and
- a control unit, adapted to modulate a difference in speed between the winding members and the unwinding member of each unwinder as a function of a signal from the respective load sensor.
A method for rewinding tissue paper web materials, from primary reels to secondary reels, through successive winding cycles spaced by stops for replacement of the secondary reels with new winding cores, the method comprising the steps of:
- unwinding a first primary reel of tissue paper web material comprising at least one ply of tissue paper by a first unwinding member controlled by a first unwinding motor;
- unwinding a second primary reel of tissue paper web material comprising at least one ply of tissue paper by a second unwinding member controlled by a second unwinding motor;
- winding the first web material and the second web material in a winding station by at least one winding motor and forming at least one secondary reel in the winding station, wherein a plurality of secondary reels are produced in a sequence of start-stop cycles by winding the first web material from the first primary reel and the second web material from the second primary reel;
- detecting a parameter function of the tension of the first web material and of the second web material along the respective path between the first unwinding member and the second unwinding member and the winding station;
- controlling a difference between a speed of the winding motor and of each unwinding motor as a function of said parameter function.
Dependencies are inferred from the claim text.