An apparatus for exchanging paper rolls includes a paper supply mechanism having an inclined arm and a clamp assembly for receiving and holding a first paper roll; a second-roll hanger assembly arranged above the paper supply mechanism for receiving and holding a second paper roll; a slide rail arranged between the paper supply mechanism and the second-roll hanger assembly; an elevating assembly movably mounted to the slide rail; and a driving assembly for driving the elevating assembly to move along the slide rail. The elevating assembly picks up the second paper roll from the second-roll hanger assembly. To exchange the first paper roll with the second paper roll, the clamp assembly pushes the first paper roll away from the paper supply mechanism, and the elevating assembly lowers down along the slide rail to place the second paper roll in the paper supply mechanism.

Unwinder for paper converting, comprising a support (1) adapted to support a reel (B) from which a web of paper material is unwound and comprising dragging means acting by contact on said reel (B) and adapted to impose a rotation of the reel coil about the respective longitudinal axis (x) with a predetermined speed, the diameter of the reel (B) varying while the latter rotates. The dragging means have a variable configuration. The unwinder comprises reconfiguration means adapted to vary the configuration of the dragging means on the basis of the instantaneous diameter of the reel (B) and control means (5; EU) adapted to control said reconfiguration means such that the contact between the reel (B) and control the dragging means takes place on a contact area (200) having an angular extension (a) substantially constant while the diameter of the reel (B) varies.

An apparatus for a single-track or multitrack provision of web-like interleaved sheet material at a cutting region in which products supplied on one track or on multiple tracks are cut into slices and interleaved sheets are introduced which are cut off from the provided interleaved sheet material in the cutting region, comprising an output device which is configured to eject at least one material web into the cutting region, wherein the output device comprises at least one driven feed roll and at least one counter-unit which forms a feed gap for the material web together with the feed roll.

An apparatus for exchanging paper rolls includes a paper supply mechanism having an inclined arm and a clamp assembly for receiving and holding a first paper roll; a second-roll hanger assembly arranged above the paper supply mechanism for receiving and holding a second paper roll; a slide rail arranged between the paper supply mechanism and the second-roll hanger assembly; an elevating assembly movably mounted to the slide rail; and a driving assembly for driving the elevating assembly to move along the slide rail. The elevating assembly picks up the second paper roll from the second-roll hanger assembly. To exchange the first paper roll with the second paper roll, the clamp assembly pushes the first paper roll away from the paper supply mechanism, and the elevating assembly lowers down along the slide rail to place the second paper roll in the paper supply mechanism.

An apparatus and method for supporting sheet material, comprising a frame including a first arm and a second arm, the second arm in communication with the first arm to support a roll of the sheet material there-between, and a drive roller for transporting the sheet material from the roll. The first arm and the second arm automatically resize the frame corresponding to the dimensions of the roll of the sheet material to provide constant tension in the roll of sheet material by controlling a position of the roll of the sheet material.

An apparatus for a single-track or multitrack provision of web-like interleaved sheet material at a cutting region in which products supplied on one track or on multiple tracks are cut into slices and interleaved sheets are introduced which are cut off from the provided interleaved sheet material in the cutting region, comprising an output device which is configured to eject at least one material web into the cutting region, wherein the output device comprises at least one driven feed roll and at least one counter-unit which forms a feed gap for the material web together with the feed roll.

The invention relates to an apparatus for a single-track or multitrack provision of web-like interleaved sheet material at a cutting region in which products supplied on one track or on multiple tracks are cut into slices and interleaved sheets are introduced which are cut off from the provided interleaved sheet material in the cutting region, comprising an output device which is configured to eject at least one material web into the cutting region, wherein the output device comprises at least one driven feed roll and at least one counter-unit which forms a feed gap for the material web together with the feed roll.

A constant tension mechanism of tying net for roll bales, that allows varying the stretching tension of the material in accordance with different diameters and thus provide a tying tension that allows keeping the geometry of the roll bale throughout time.

An apparatus and method for supporting sheet material, comprising a frame including a first arm and a second arm, the second arm in communication with the first arm to support a roll of the sheet material there-between, and a drive roller for transporting the sheet material from the roll. The first arm and the second arm automatically resize the frame corresponding to the dimensions of the roll of the sheet material to provide constant tension in the roll of sheet material by controlling a position of the roll of the sheet material.

Method for unwinding web materials from two parent reels (1, 2), wherein a first parent reel (1) in a depletion phase is replaced by a second parent reel (2), wherein during said replacement a first and a second web material (N1, N2) are unwound from both parent reels, wherein before the completion of said replacement the first web material (N1) is joined to the second web material (N2) and then it is cut, wherein the joining of said web materials (N1, N2) is preceded by the insertion of the second web material in an area where the two web materials are joined, and during the step of inserting the second web material in said joining area the second web material is guided on a guide surface (41, 44) which guides it towards the joining area. In said insertion step, the second web material adheres pneumatically to guide surface.