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AssigneeE. I. Du Pont de Nemours and Company
InventorsGilles Petitjean, Nicolas Rollinger, Bert Van Den Bedem, Jean-Luc Verheggen
Estimating the term…
Apparatus for automatic high-speed winding of a continuous web of thin film-like material onto a core to form a wound roll, in which the film is applied by a train of idling lay-on rolls consisting of first and second rolls arranged parallel to the said core and which, in the production position are applied against the roll being wound by use of a pneumatic cylinder having a movable piston situated at each end of each roll and each acting on a respective pivoting arm one end of which carries a bearing on which the rolls are journaled and the other end of which pivots on a carriage that can be advanced and retracted along a guide path, enabling perfectly uniform wound rolls to be obtained.
An apparatus for winding a continuous web of film material onto a core driven in rotation by a spindle and onto which said web of film is wound in order to form a cylindrical wound roll by means of a train of lay-on rolls for applying said web to said core, said train comprising first and second idling rolls arranged parallel to said core the first of said rolls being partially surrounded, during winding of said core, by said web and being disposed tangentially with respect to said second roll while firmly pressing said web against a surface of the second roll, and with respect to an outer surface of the wound roll to which said film is applied wherein, in the winding position, said first and second rolls are respectively applied to the outer surface of said wound roll being formed on said core and to said first roll by separate urging means located at each end of each roll and each urging means having a pivoting arm one end of which carries a bearing allowing rotation of a roll mounted therein and the other end of which pivots on a carriage movable along a guiding surface, said guiding surfaces of each of said rolls being parallel and the movements of the two carriages of a roll being synchronized by mechanical synchronization means linking said two carriages and web feeding and slitting rolls comprising a third roll providing transfer to said second lay-on roll, a fourth roll for tensioning said continuous web of film during cutting and a fifth roll for stabilizing and maintaining the web o film during cutting thereof, said third, fourth and fifth rolls being parallel to one another, in the production position of said apparatus, in a position where they are substantially vertically aligned one above the other and mutually spaced, said web of film being wound, prior to engaging said second lay-on roll, partially over said web-feeding rolls in alternate directions from one roll to the next.
An apparatus for winding a web of film according to claim i wherein where said apparatus includes several cores each arranged on one of the arms of a rotatable turret means, the carriages of said first and said second lay-on rolls are adapted to move along their guiding surfaces to a retracted position remote from said wound roll to allow the arms, carrying a said wound roll or core, of said turret to rotate.
A method for winding a continuous web of film material onto a core driven in rotation by a spindle and onto which said web is wound in order to constitute a cylindrical wound roll by means of a train of lay-on film application rolls consisting of first and second rolls pressing said web of film partially wound around said first roll respectively against the outer surface of said wound roll and against said first roll, wherein end bearings of the first and second rolls are mounted on a pivoting arm carried by a carriage movable on a guiding surface and the movements of the two carriages of each roll being synchronized, wherein each of said arms is acted on by individual urging means to cause pivoting thereof whereby said second roll is urged against said first roll in order to introduce said web onto said core with web feed and guiding rolls over which said web passes provided ahead of said lay-on film application rolls wherein each one of the end bearings of at least one of two alternate ones of said web feed and guiding rolls is mounted on a movable carriage moving linearly on a guiding surface in mechanical synchronization with the other of the two carriages of each of said rolls, said alternate individual rolls being displaced through moving of the carriages thereof on said guiding surfaces in order to bring them close to said wound roll of film and to open up a passage between said alternate rolls through which the leader end of a web to be wound in introduced and wherein, after the start of winding, said carriages are returned to their starting position in order to bring said web of film into contact with said feed and guiding rolls.
Dependencies are inferred from the claim text.