Abstract: A control method for a cutting blade, particularly for cutting-off machines for logs of web material, interrupts operation of the cutting blade when deformation of the blade reaches a preset deformation value and resumes operation of the cutting blade when the deformation of the blade is less than another preset deformation value. The control method measures deformation values of at least a portion of the cutting blade, compares the measured deformation values with at least one preset deformation value set by an operator, and sends, according to signals coming from the result of the comparison, control signals to a motor of the machine to control the start up and/or the stop of the motor.

Abstract: A control method for a cutting blade, particularly for cutting-off machines for logs of web material, interrupts operation of the cutting blade when deformation of the blade reaches a preset deformation value and resumes operation of the cutting blade when the deformation of the blade is less than another preset deformation value. The control method measures deformation values of at least a portion of the cutting blade, compares the measured deformation values with at least one preset deformation value set by an operator, and sends, according to signals coming from the result of the comparison, control signals to a motor of the machine to control the start up and/or the stop of the motor.

Abstract: A control device for a cutting blade, particularly for cutting-off machines for logs of web material, interrupts operation of the cutting blade when deformation of the blade reaches a preset deformation value and resumes operation of the cutting blade when the deformation of the blade is less than another preset deformation value. The control device includes a measuring device for measuring deformation values of at least a portion of the cutting blade, at least one comparator for comparing the measured deformation values with at least one preset deformation value set by an operator, and an actuator which sends, according to signals coming from the comparator, control signals to a motor of the machine to control the start up and/or the stop of the motor.

Abstract: Apparatus for gluing the final tail of rolls or logs of wound sheet material includes a glue distributor device located below an opening in a roll down table. The tail of the roll is separated from the roll by a tail separating unit upstream of the opening. The gluing distributor device includes a tank containing glue, a rotatable pick up roll located inside of the tank and partially immersed in the glue, and a glue distributor roll positioned externally above the tank and provided with at least one paddle. The pick up roll picks up glue as it rotates, and the rotating paddle contacts the pick up roll and picks up glue as the glue distributor roll rotates. The paddle rotates into the opening in the roll down table, and glue is transferred from the paddle to a roll as the roll rolls over the opening. A cull roll can be culled without applying glue to the roll by mounting a cull roll support projection on the glue distributor roll which is not long enough to contact the pick up roll.

Abstract: An embossing assembly for sheet material includes at least two embossing rollers, the ends of which are rotatably mounted in the side panels of an embossing machine. Each of the side panels is divided into a fixed portion and at least one movable portion. The ends of the embossing rollers are mounted in supports which are removably fixed in seats formed in the fixed portions of the side panels or in the movable portions of the side panels of the machine. In this manner, when the movable portions of side panels are moved with respect to the fixed portions of side panels, a space is cleared for removal of at least a portion of the embossing roller supports.

Abstract: A stiffening device for a web destined to be wound in a log by a winding unit of a re-winding machine forms on the web at least one longitudinal strip of greater thickness, so as to obtain in the log at least one sector with a greater stiffness to avoid deformation of the log during winding.

Abstract: In a rewinding machine (10), a device (50) for discharging logs (20, 20?) comprises: a chute (30) disposed downstream of a winding area (2) designed to allow the formed logs (20?) to roll towards the output of the winding machine (10), a stopping device (111, 117) designed to stop the log (20?) on the chute (30), and an actuator (113) acting on the stopping device (111) to bring it from a working position in which it stops the log (20?) to a resting position in which it allows the log (20?) to roll on the chute (30). The chute (30) comprises: a first portion (31) with a slight slope, disposed at the output of the winding area (2), designed to slow the log (20?) by friction or in any case not to accelerate the rolling thereof, and a second portion (32) with a slope greater than that of the first portion (31), designed to accelerate by gravity the rolling of the log (20?) after it has been stopped by means of the stopping device (111,117).

Abstract: An embossing assembly for sheet material includes at least two embossing rollers, the ends of which are rotatably mounted in the side panels of an embossing machine. Each of the side panels is divided into a fixed portion and at least one movable portion. The ends of the embossing rollers are mounted in supports which are removably fixed in seats formed in the fixed portions of the side panels or in the movable portions of the side panels of the machine. In this manner, when the movable portions of side panels are moved with respect to the fixed portions of side panels, a space is cleared for removal of at least a portion of the embossing roller supports.

Abstract: In a rewinding machine (10), a device (50) for discharging logs (20, 20?) comprises: a chute (30) disposed downstream of a winding area (2) designed to allow the formed logs (20?) to roll towards the output of the winding machine (10), stopping means (111, 117) designed to stop the log (20?) on the chute (30), and drive means (113) acting on the stopping means (111) to bring them from a working position in which they stop the log (20?) to a resting position in which it allows the log (20?) to roll on the chute (30). The chute (30) comprises: a first portion (31) with a slight slope, disposed at the output of the winding area (2), designed to slow the log (20?) by friction or in any case not to accelerate the rolling thereof, and a second portion (32) with a slope greater than that of the first portion (31), designed to accelerate by gravity the rolling of the log (20?) after it has been stopped by means of the stopping means (111, 117).

Abstract: A rewinding machine for the production of logs of web material around a tubular core includes a first winding roller around which the web material is fed, a second winding roller forming a gap with the first winding roller, through which gap the core is inserted, and a third roller mounted movably to allow the diameter of the log to increase and the log to be discharged at the end of winding. A blade is carried by a rotating member which is pivoted on the axis of said first winding roller and protrudes from the profile of the roller. The blade rotates in the same direction as the first winding roller at different speeds, so as to undergo a deceleration or an acceleration when it is in contact with the web material in the winding space defined by the three rollers to cause severing of the web material at the end of winding.

Abstract: A device for removal of trimmings obtained from cutting of logs of web material by means of a log cutting machine which include a cutting blade for log cutting and a supporting surface downstream of the cutting blade to support cut out rolls. The device for removal of trimmings is disposed downstream of the supporting surface and at least one pair of conveyor belts for conveying the rolls toward an unloading station, the lower conveyor belt having a back-up horizontally movable roller able to move toward or away from the supporting surface thus creating a gap between the supporting surface and the conveyor sufficient for the trimmings to pass through and fall beneath the machine, while the cut out rolls pass form the supporting surface to the conveyor.

Abstract: A rewinding machine for the production of logs of web material around a tubular core includes a first winding roller around which the web material is fed, a second winding roller forming a gap with the first winding roller, through which gap the core is inserted, and a third roller mounted movably to allow the diameter of the log to increase and the log to be discharged at the end of winding. A blade is carried by a rotating member which is pivoted on the axis of said first winding roller and protrudes from the profile of the roller. The blade rotates in the same direction as the first winding roller at different speeds, so as to undergo a deceleration or an acceleration when it is in contact with the web material in the winding space defined by the three rollers to cause severing of the web material at the end of winding.

Abstract: A device for removal of trimmings obtained from cutting of logs of web material by means of a log cutting machine which include a cutting blade for log cutting and a supporting surface downstream of the cutting blade to support cut out rolls. The device for removal of trimmings is disposed downstream of the supporting surface and at least one pair of conveyor belts for conveying the rolls toward an unloading station, the lower conveyor belt having a back-up horizontally movable roller able to move toward or away from the supporting surface thus creating a gap between the supporting surface and the conveyor sufficient for the trimmings to pass through and fall beneath the machine, while the cut out rolls pass form the supporting surface to the conveyor.

Abstract: A device for eliminating the head and tail scraps (S) that are left after rolls of paper (2), such as toilet paper, kitchen paper, paper for industrial use and the like, have been cut from a log, said device comprising two belts (4, 5) arranged in a vertical plane at an adjustable distance, to adapt the distance between their inside opposite branches (4', 5') to the size of the roll (R), so that the latter is gripped and conveyed between said belts (4, 5), whereas a scrap (S), smaller in size, rests only on the lower belt (4'), in the vicinity of its center line, falling through loss of balance of the resting point.

Abstract: A rewinding machine and method for producing rolls or logs (1) of sheet material (W) around a tubular core (2), comprising a first winding roller (A) around which the sheet material (W) is directed, a second winding roller (B) forming a throat (3) with the first roller (A) through which the core (2) is introduced and a third roller (C) mounted mobile to allow the diameter of the log (1) to increase and the log to be discharged at the end of winding, in which a cutting blade (17) is provided that can be brought cyclically into contact with a portion of the web comprised between a new core (2) being introduced into the winding cradle and the made-up log being moved away, to cause separation thereof.