Winding – tensioning – or guiding – Convolute winding of material – Detector – control – or material responsive stop
Patent
1997-10-08
1998-12-29
Darling, John P.
Winding, tensioning, or guiding
Convolute winding of material
Detector, control, or material responsive stop
2425331, 2425421, B65H 1816
Patent
active
058531408
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
1. Technical field
The present invention relates to an improvement to a peripheral re-reeling machine of the type comprising a first winding roller, around which the band-shaped material to be wound is guided, a second winding roller defining, with the first winding roller, a throat into which the winding cores are introduced in succession, means for introducing the cores into said throat and means of control for bringing about, at the end of winding of a roll, a cyclical variation in the winding conditions for control of the advance of the new core (if appropriate with the first turns of material wound around it) through the throat.
Re-reeling machines of this type, commonly known as automatic peripheral re-reeling machines, are used for example in the paper conversion industry to form continuously logs or rolls of wound paper starting from bobbins of large diameter. The logs are successively cut perpendicularly to their own axis to produce small rolls of toilet paper, all-purpose towels and similar products of desired height.
The invention also relates to an improvement to a method for the production of logs of band-shaped material wound on tubular cores comprising the phases of: providing a first winding roller around which the band-shaped material is guided; providing a second winding roller, a throat being defined between the first and the second winding roller for the passage of the winding cores; at the end of the winding of a roll, varying temporarily the conditions of winding to introduce a new core through said throat.
2. State of the Art
Among the numerous patents relating to re-reeling machines of this type, U.S. Pat. Nos. 4,327,877, 4,487,377, 4,723,724, 4,828,195, 5,248,106, 5,249,756, British patent no. 2,105,688, European patent no. 0 498 039 and more recently the international publication WO 94/21545 and the Italian patent application MI93A 1013 stand out, among others.
In peripheral re-reeling machines of this type, the band-shaped material is fed continuously and at an essentially constant speed of the order of 400-700 m/min and up to 1000 m/min in the most advanced machines. There is inserted into the re-reeling machine a tubular cardboard core, on which, in the span of time of 1-3 seconds, the log or roll is formed. This has then to be discharged from the winding zone to make space for a new core on which a new log is being formed. The operations of insertion of the core are effected in various ways but typically with a temporary variation of the winding conditions. In general terms, the passage of the core through the throat defined by the two winding rollers takes place by means of a difference between the peripheral speeds of the two winding rollers. The difference in speed can be different according to the methods of functioning of the machine and can be due to a temporary variation, comprised for example between 1% and 20% in relation to the speed of advance of the band-shaped material. Once the core has passed through the throat, or while it is passing through it, the speed of rotation of the second winding roller is gradually increased again to the operating speed, close or equal to the speed of the first winding roller. In this case, therefore, the winding condition which is varied is the peripheral speed of the winding roller.
The deceleration/re-acceleration cycle of the second winding roller and that of the insertion of the core in contact with the band-shaped material are synchronized with one another. Thus the re-acceleration of the second winding roller starts when the core has theoretically reached a given predetermined position in relation to the winding rollers. This synchrony is obtained by making reference to the angular position of the first winding roller, or of another roller for conveying the band-shaped material, which has a given position in relation to the band-shaped material.
In some machines, the insertion of the core takes place still by difference of speed between the first and the second winding roller, but the condition of winding which is
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Darling John P.
Fabio Perini S.p.A.
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