Abstract: A buffer store for a flat web material includes two roller registers having freely rotatable rollers movable relative to one another in a direction radial to a roller axis, thereby forming loops of the web material between the rollers, a piston-cylinder arrangement having a chamber containing a compressible medium and acting as a spring between the registers to generate web tension in the material, and a control-valve arrangement that switches between a first condition, for normal operation, and a second condition, for operation during a fault. In the first condition, the control-valve arrangement connects the cylinder chamber of the piston-cylinder arrangement to a device for providing a constant operating pressure. In the second condition, the control-valve arrangement closes the cylinder chamber of the piston-cylinder arrangement and connects it to a relief valve that relieves pressure therein to a residual pressure significantly smaller than the operating pressure.

Abstract: A motorized yarn-winding drum holds a plurality of loops of yarn wound thereon and is driven to rotate for drawing said yarn from a reel and feeding it to a general downstream machine. A movable guiding member is biased to slideably engage the yarn unwinding from the drum and to deviate its path, by a spring acting in contrast to the tension of the yarn, thereby generating a reserve releasable in response to tension peaks on the yarn. The stroke of the guiding member is limited by a stop defining a position of maximum deviation of the yarn. The spring has one end operatively connected to the guiding member and one opposite end connected to driving elements operable for applying a load to the spring, with the guiding member abutting against said stop. The driving elements are controlled by a control unit which is programmed to adjust the load as a function of a desired feeding tension.

Abstract: In a device for supplying a printing substrate web to an internal transport path of the printing substrate web of a printing device, a device accepts the printing substrate web from the printing substrate web source. A drive unit is provided at an output of the device and draws the printing substrate web from the device. A buffer device having a buffer reservoir is provided at an output of the drive unit. The buffer reservoir has a negative pressure device that generates a negative pressure in a buffer reservoir. The negative pressure acts on the printing substrate web to pull the printing substrate web drawn by the drive unit into the buffer reservoir and thereby tensions the printing substrate web before it is supplied to the internal transport path.

Abstract: A motorized yarn-winding drum holds a plurality of loops of yarn wound thereon and is driven to rotate for drawing said yarn from a reel and feeding it to a general downstream machine. A movable guiding member is biased to slideably engage the yarn unwinding from the drum and to deviate its path, by a spring acting in contrast to the tension of the yarn, thereby generating a reserve releasable in response to tension peaks on the yarn. The stroke of the guiding member is limited by a stop defining a position of maximum deviation of the yarn. The spring has one end operatively connected to the guiding member and one opposite end connected to driving elements operable for applying a load to the spring, with the guiding member abutting against said stop. The driving elements are controlled by a control unit which is programmed to adjust the load as a function of a desired feeding tension.

Abstract: A method and an apparatus for corrugating and winding up rolls of a plastic film. The plastic film is corrugated as it is continuously wound onto a roll, by a film drawing drum conformed with a plurality of longitudinally extending grooves to perform open-end corrugation or folds which extend crosswise the film; the plastic film is corrugated crosswise, causing the same film to penetrate into the grooves of the drawing drum by suction of air through a plurality of suction holes which open out into the grooves of the drum.

Abstract: A method and an apparatus f or winding careless and soft-core rolls (11), of film materials (10). The film (10) is made to advance, at differentiate speeds (S1, S2), between a first and a second drawing unit (12, 21) making the film (10) to perform a floating loop (19). The film (10) is fed in a controlled way, making it adhere to a grooved corrugating drum (22) by an air jet (29) to corrugate cross corrugations in the film (10) while it is being wound up; the corrugations of the film (10) traps air and prevents the implosion of the roll (11). A programmable electronic unit (32), controls the drawing units (12, 21) in relation to control signals (E1, E2) related to the feeding and winding up speeds (S1, S2) of the film (10), and in relation to a control signal supplied by a sensing device (28) for detecting the position of the floating loop (19).

Abstract: In one aspect, a method of correcting a loosely wound supply roll to be used with a label applying machine is described. The method includes providing a supply roll having a material web wound thereon, the supply roll mounted on a supply roll spindle such that the material web is aligned with an intake of a labeling mechanism on the label applying machine. The method further includes mounting a moveable web guide to apply pressure to the material web being supplied to the labeling mechanism, wherein the web guide includes an encoder. The method further includes determining the tension of the material web wound around the supply roll using the movable web guide and the encoder. Further still, the method includes adjusting the tension of the material web wound around the supply roll if the material web is determined to be too loosely wound about the supply roll to provide adequate tension to the web as the web leaves the supply roll.

Abstract: A wire consumer, such as a bale binder, draws wire from a wire coil on an unreeling device. The entire unreeling device is mounted on a wheel-supported frame, and it comprises a wire loop and an acceleration balancer which is effective when the wire consumer starts to draw wire out from the unreeling device. The wire loop comprises a wheel, which is loaded by a spring, and an air cylinder, which is coupled to the wheel for damping the acceleration of the wheel.

Abstract: A bag making machine including a film web supply roll, a draw roll for drawing the film web to a bag forming section, a seal bar in the bag forming section of the bag making machine for sealing the drawn film web, and a tension control system, the tension control system including a surface drive roll, a surface drive roll servo, a vacuum box, a torque mode capstan, a capstan servo drive, a draw roll servo drive, and a controller programable to control the film web tension in a first run of the film web between the supply roll and the torque mode capstan independently from the tension in a second run of the film web between the capstan and the draw roll.

Abstract: An apparatus for controlling the web tension in a perforation-welding system for making bags from synthetic resin foil webs in which whistling noises are eliminated by passing the web over a wall of a polygonal duct having an air outlet opening to which compressed air is fed. The air cushion and hence the spacing of the web from the wall is measured by an ultrasonic detector on the opposite of the web.

Abstract: A controller of running tension of paper web for rotary press including a paper feed unit 1 and a printing unit 2 provided with a printing cylinder 21 rotating according to an operation speed command, having an in-feed roller 4 provided in a running path of paper web W from a paper roll 11 of the paper feed unit 1 to the printing cylinder 21, a dancer roller device 5 for detecting a displacement amount of a dancer roller 51 relative to a reference position of the dancer roller 51 and absorbing variations of running tension of the paper web W by the displacement, and a tension control processing unit S1 for performing signal generation processing to optimize the peripheral speed of the in-feed roller 4 with respect to the peripheral speed of the printing cylinder 21 based on the displacement amount of the dancer roller 51 and the operation speed command.

Abstract: A rope system includes an endless rope, a measuring device and a rope cutter. The endless rope is configured to travel through a machine, while the endless rope is under tension. The measuring device is used to measure the tension in the endless rope. The rope cutter is positioned to sever the endless rope if the tension exceeds a predetermined value.

Abstract: A system to synchronize the withdrawing and feeding motions of a flexible ribbon (1), including a synchronizing chamber (6) through which is running the flexible ribbon, that presents a curvilinear part with the concavity pointing upwards (10, 11) by means of the suction of a device (4) applied at the bottom of the synchronizing chamber (6). A proximity sensor (4) detects the position of the curvilinear part (10, 11) and controls the synchronizing of the withdrawal and feeding motions, continuous or intermittent, of the running flexible ribbon.

Abstract: A method and system for preventing damage to a movable dancer assembly in a festoon upon the breakage of the running web that runs through the festoon. During normal running of the web, the vertical position of the dancer assembly, in the festoon and vis-à-vis the fixed entry and exit idlers of the festoon, is controlled by a dancer tensioning cylinder assembly that includes a cylinder and a piston which is connected with the dancer assembly and which is movable in the cylinder in response to pressurized air in a first portion of the cylinder and applied to a first surface of the piston. Upon the breaking of the running web, air pressure is permitted to increase in a second portion of the cylinder and is applied to the second, opposite surface of the piston until the pressure of the air in the first and second positions becomes equal. After a preselected delay after the running web breaks, the pressurized air in the first and second portions of the cylinder is bled from the cylinder.