Web winding method and winder

A support drum winder, comprising:

• a trailing support drum having a central axis of rotation,
• a leading support drum having a central axis of rotation and disposed substantially parallel to the trailing support drum, whereby the support drums define a web winding position therebetween,
• support arm means mounted for pivotal movement about an axis which substantially coincides with the central axis of the trailing support drum,
• core replacement apparatus carried by the support arm means for movement about the periphery of the trailing support drum when the support arm means undergo pivotal movement, said core replacement apparatus comprising pusher means for engaging a roll in a position in which the roll rests on the support drums and pushing it upwards, into an equilibrium position in which it rests on the leading support drum and further pushing it beyond the equilibrium position towards a roll receiving position, web cutting means for engaging and cutting the web when the roll has been moved from the winding position and before the roll reaches the equilibrium position, and core supply means for placing a new roll core in the web winding position after the web has been cut,
• a web retainer device,
• inserter means for inserting the web retainer device between the support drums for holding the web in contact with the trailing support drum, and
• guide means for engaging the core replacement apparatus and defining a path of movement of the core replacement apparatus such as to ensure that the web cutting means do not strike the leading support drum or the retainer device, the guide means being stationary relative to the central axes of the support drums.

A support drum winder, comprising:

• a trailing support drum having a central axis of rotation,
• a leading support drum having a central axis of rotation and disposed substantially parallel to the trailing support drum, whereby the support drums define a web winding position therebetween,
• support arm means mounted for pivotal movement about an axis which substantially coincides with the central axis of the trailing support drum,
• core replacement apparatus carried by the support arm means for movement about the periphery of the trailing support drum when the support arm means undergo pivotal movement, the core replacement apparatus being supported by the support arm means in a manner permitting pivotal movement of the core replacement apparatus relative to the support arm means about an axis which is spaced from the axis of pivotal movement of the support arm means by a distance which is greater than the radius of the trailing support drum, the support arm means undergoing pivotal movement from a rest position to an end position when carrying out a core replacement operation, and said core replacement apparatus comprising:
• pusher means for engaging a roll in a position between the support drums and pushing it over the leading support drum towards a roll receiving position;
• web cutting means for engaging and cutting the web when the roll has been moved from the winding position, the web cutting means being initially close to the surface of the trailing support drum when the support arm means undergo pivotal movement from the rest position towards the end position;
• and
• core supply means for placing a new roll core in the web winding position after the web has been cut,
• a guide member positioned adjacent to support drums, a retainer device,
• inserter means for inserting the retainer device between the support drums for holding the web in contact with the trailing support drum, and
• at least one follower member carried by the core replacement apparatus for engaging the guide member during pivotal movement of the support arm means from the rest position towards the end position, thereby bringing about pivotal movement of the core replacement apparatus relative to the support arm means and influencing the path of movement of the web cutting means after the web has been cut so that the cutting means are turned away from the leading support drum and do not strike the leading support drum or the retainer device.

A support drum winder, comprising:

• a trailing support drum having a central axis of rotation,
• a leading support drum having a central axis of rotation and disposed substantially parallel to the trailing support drum, whereby the support drums define a web winding position therebetween,
• support arm means mounted for pivotal movement about an axis which substantially coincides with the central axis of the trailing support drum,
• core replacement apparatus carried by the support arm means for movement about the periphery of the trailing support drum when the support arm means undergo pivotal movement, said core replacement apparatus comprising pusher means for engaging a roll in a position between the support drums and pushing it over the leading support drum towards a roll receiving position, web cutting means for engaging and cutting the web when the roll has been moved from the winding position, and core supply means for placing a new roll core in the web winding position after the web has been cut,
• a retainer device, and
• inserter means for inserting the retainer device between the support drums for holding the web in contact with the trailing support drum, and wherein the inserter means are able to insert the retainer device between the support drums to such an extent as to engage a roll in the web winding position and lift the roll to a position in which the pusher means are able to engage the roll and push it over the leading support drum.

A support drum winder, comprising:

• a trailing support drum having a central axis of rotation,
• a leading support drum having a central axis of rotation and disposed substantially parallel to the trailing support drum, whereby the support drums define a web winding position therebetween,
• support arm means mounted for pivotal movement about an axis which substantially coincides with the central axis of the trailing support drum,
• core replacement apparatus carried by the support arm means for movement about the periphery of the trailing support drum when the support arm means undergo pivotal movement, the support arm means undergoing pivotal movement from a rest position to an end position when carrying out a core replacement operation, and said core replacement apparatus comprising pusher means for engaging a roll in a position between the support drums and pushing it over the leading support drum towards a roll receiving position, web cutting means for engaging and cutting the web when the roll has been moved from the winding position, and core supply means for placing a new roll core in the web winding position after the web has been cut, said core supply means comprising holding grips for holding a new roll core, the holding grips being releasable for placing the new roll core in the web winding position, and being movable in the vertical direction when the support arm means are in the rest position or in the end position, so that the holding grips are able to pick up a new roll core from a core shelf and lower the new core towards the web winding position,
• a retainer device, and
• inserter means for inserting the retainer device between the support drums for holding the web in contact with the trailing support drum.

A support drum winder, comprising

• a trailing support drum having a central axis of rotation,
• a leading support drum having a central axis of rotation and disposed substantially parallel to the trailing support drum, whereby the support drums define a web winding position therebetween,
• support arm means mounted for pivotal movement about an axis which substantially coincides with the central axis of the trailing support drum,
• core replacement apparatus carried by the support arm means for movement about the periphery of the trailing support drum when the support arm means undergo pivotal movement, the support arm means undergoing pivotal movement from a rest position to an end position when carrying out a core replacement operation, said core replacement apparatus comprising:
• pusher means for engaging a roll in a position between the support drums and pushing it over the leading support drum towards a roll receiving position, the pusher means being mounted for pivotal movement relative to the support arm means;
• support elements locking the pusher means against pivotal movement relative to the support arm means during return pivotal movement of the support arm means from the end position towards the rest position thereof, whereby pivotal movement of the pusher means relative to the support arm means is limited;
• web cutting means for engaging and cutting the web when the roll has been moved from the winding position;
• and
• core supply means for placing a new roll core in the web winding position after the web has been cut,
• a retainer device, and
• inserter means for inserting the retainer device between the support drums for holding the web in contact with the trailing support drum.