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.

A belt device includes a belt wound around support rotators, to travel as the support rotators rotate; a belt contact member on a rotation shaft of one of the support rotators, to contact an end of the belt and move in an axial direction of the rotation shaft with the belt; a displacement member on the rotation shaft and including an inclined face to move the one support rotator, to move in the axial direction as the belt contact member moves; a guide to contact the inclined face and restrict a moving direction of the displacement member; a shaft support rotatably supporting the one support rotator and the rotation shaft; a restriction member to restrict movement of the one support rotator and the rotation shaft; and an elastically deformable intermediate member between the shaft support and the restriction member, to prevent the shaft support from contacting the restriction member.

An image forming apparatus that has a transfer device that includes an intermediate transfer belt that is tensioned by a plurality of support rollers, a secondary transfer roller that faces one of the support rollers via the intermediate transfer belt, a cam that adjust a pressing force that presses the intermediate transfer belt by the secondary transfer roller, a motor that drives the cam, and a conveyor that conveys a recording medium to a transfer nip formed between the intermediate transfer belt and the secondary transfer roller is provided with a controller that controls an operation of the motor. The controller executes first control of operating the motor with a constant torque and stopping the motor when a rotation angular speed of the motor is less than or equal to a first threshold and second control of operating the motor at a predetermined timing to adjust a transfer nip amount.

A variable roll cage machine and process to roll up material, like high expansion force material. The machine includes a roll chamber to receive the material. The roll chamber has a longitudinal central axis and a plurality of rollers located around a circumference of the roll chamber. The plurality of rollers include two roll groups of at least two rollers in each roll group. At least one of the rollers in each roll group is movable toward the longitudinal central axis independent of at least one other roller in the roll group. A material infeed gap is in the circumference of the roll chamber located between the two roll groups and spaced from the at least one of the rollers in each roll group that is movable.

An image forming apparatus that has a transfer device that includes an intermediate transfer belt that is tensioned by a plurality of support rollers, a secondary transfer roller that faces one of the support rollers via the intermediate transfer belt, a cam that adjust a pressing force that presses the intermediate transfer belt by the secondary transfer roller, a motor that drives the cam, and a conveyor that conveys a recording medium to a transfer nip formed between the intermediate transfer belt and the secondary transfer roller is provided with a controller that controls an operation of the motor. The controller executes first control of operating the motor with a constant torque and stopping the motor when a rotation angular speed of the motor is less than or equal to a first threshold and second control of operating the motor at a predetermined timing to adjust a transfer nip amount.

A device for automatically unwinding web-shaped materials (8) from a master roll (3), and to a method for operating a device of this type are disclosed. The device has an infeed arm (2) and a first drive unit (6), wherein the master roll (3) by way of the winding core (4) thereof is rotatably mountable on the infeed arm (2), and the first drive unit (6) serves for introducing a driving force into the master roll (3). In order for high productivity to be achieved, the unwinder (1) has an outfeed arm (13) to which a second drive unit (14) for introducing a driving force into the master roll (3) is assigned, wherein the master roll (3) during an unwinding procedure is transferable from the infeed arm (2) to the outfeed arm (13). The material web (8) is then unwound from the master roll (3) which is mounted on the infeed am (2) down to a predefinable minimum diameter, wherein during the ongoing unwinding procedure the master roll (3) is subsequently transferred to the outfeed arm (13) and thereon is further actively unwound, wherein a new master roll (3) is received by the infeed arm (2). Unwinding without interruption is thus enabled.

A belt device includes a belt wound around support rotators, to travel as the support rotators rotate; a belt contact member on a rotation shaft of one of the support rotators, to contact an end of the belt and move in an axial direction of the rotation shaft with the belt; a displacement member on the rotation shaft and including an inclined face to move the one support rotator, to move in the axial direction as the belt contact member moves; a guide to contact the inclined face and restrict a moving direction of the displacement member; a shaft support rotatably supporting the one support rotator and the rotation shaft; a restriction member to restrict movement of the one support rotator and the rotation shaft; and an elastically deformable intermediate member between the shaft support and the restriction member, to prevent the shaft support from contacting the restriction member.

The present invention relates to a rewinding machine equipped with a support system for the reel and the ribbon-like product.

In particular, the invention relates to a rewinding machine (1) for a ribbon-like product (N), comprising: a fixed support structure which supports an unwinding unit (SV) and a rewinding unit (RB); an independent first carrier roller (2), movable along a direction parallel to a support surface of the rewinding machine (1); a second independent carrier roller (4), movable in the opposite direction with respect to the first carrier roller (2); a third roller (3), placed between the first (2) and second (4) carrier rollers and movable integrally with the first carrier roller (2); a set of driving rollers (110) placed along a path between the unwinding unit (SV) and the rewinding unit (RB); a web (10), forming at least one loop, made of a material with an air-permeable texture, said web (10) unwinding between the second carrier roller (4), the third roller (3), and the set of driving rollers (110); one or more suction boxes (6) placed under the web (10) to retain the ribbon-like product (N).