摘要:
An unreeling assembly, particularly for labeling devices, comprising a supporting frame for at least one reel of continuous film which is supported by a respective reel support, which can rotate about an unreeling axis of the reel, and a motorized traction drum, which is designed to unreel the continuous film from the reel of continuous film, between the reel of continuous film and the traction drum there being at least one tensioning element, which is movable, with respect to the supporting frame, along a respective movement path, elements being provided for estimating the radius of the reel of continuous film as a function of the data related to the angular velocity of the reel, to the speed of the film drawn by the traction drum and to the position of the tensioning element with respect to the supporting frame along the respective movement path.
摘要:
The method for measuring the diameter of a reel or roll of wound web material (N) involves the following steps: rotating said reel (L); detecting at least twice the moment when a given point (Lf) on the web material (N) passes a predetermined position; determining the time that elapses between said two passes or the amount of rotation (α) of the supporting roller (5); and calculating the diameter (D) of the reel (L) from said time (T) and the peripheral speed (V) of the reel (L) of from said amount of rotation (α) and the radius (R) of the supporting roller (5).
摘要:
It is desired to prevent disalignment of the edges of a folded sheet (U) by smoothly feeding the sheet while keeping tension fluctuactions to a minimum when the sheet is unwound from a paper roll (R) set in a paper feed unit to a packaging unit even though the paper roll diameter decreases gradually as the sheet is unwound. A sheet length measuring sensor or rotary encoder (3,32) is provided in the paper feed path through which the packaging sheet unwound from the paper roll is fed toward the packaging unit. An angle sensor (24,25) is provided which comprises Hall element sensors provide on a support shaft and magnets provided on a core pipe of the paper roll (R). Any change is the signals from one of these sensors relative to the signal from the other sensor is used to calculate the paper roll winding length, and the sheet tension is adjusted to an optimum, constant level by controlling the sheet braking force stepwise according to the roll diameter measured by the sensors.
摘要:
A paper web feeding apparatus of a cigarette manufacturing machine is permitted to be simultaneously mounted at its two rotating shafts with two reels around which paper webs of a maximum roll diameter are respectively wound. This apparatus further includes variable-diameter holders for removably mounting the reels on the rotating shafts, which are rotatably supported on the body of the feeding apparatus. Each holder includes a plurality of movable holder elements supported by the associated rotating shaft for movement in the radial direction of the shaft. As a taper cam, which is attached to the distal end of a shaft driven by an air cylinder, reciprocates along the axis of the rotating shaft, each holder element moves between a reel mounting position and a reel removing position, whereby the reel is attached to or detached from the rotating shaft. When the remainder of the paper web on one of the reels becomes insufficient, a virgin paper web wound on the other reel is connected to the web in service, so that paper web supply can be continued. An electrical brakes is used to apply an optimum braking force to the reel, thereby stabilizing tension on the paper web.
摘要:
The invention relates to a device for coating profiled sections (10), comprising a conveyor device (16) for the profiled sections, a measuring device (24) for measuring the conveyor speed of the profiled sections, and an application device (20) for applying a coating material, pulled as a continuous web (12) from a roller (14), to said profiled sections, and characterised by the presence of a rotational speed measurement device (28) for measuring the rotational speed of said roller (14), and an evaluation device (26) for calculating the length of the web (12) available on the roller (14) based on the rotational speed and the conveyor speed that have been measured.
摘要:
It is desired to prevent misalignment of the edges of a folded sheet by smoothly feeding the sheet while keeping tension fluctuations to a minimum when the sheet is unwound from a paper roll set in a paper feed unit to a packaging unit even though the paper roll diameter decreases gradually as the sheet is unwound. A core pipe for a sheet roll is provided comprising a hollow core pipe having a predetermined length for winding a sheet therearound, and magnets provided on the inner periphery of said hollow core pipe near one end thereof at angular intervals determined such that the amount and diameter of the sheet roll wound therearound can be calculated by an angle sensor provided on a fixed shaft, said hollow core pipe being rotatable together with a hollow shaft rotatably mounted around said fixed shaft. Accordingly, the sheet tension is adjusted to an optimum, constant level by controlling the sheet braking force stepwise according to the roll diameter measured by the sensors.
摘要:
It is desired to prevent disalignment of the edges of a folded sheet by smoothly feeding the sheet while keeping tension fluctuactions to a minimum when the sheet is unwound from a paper roll set in a paper feed unit to a packaging unit even though the paper roll diameter decreases gradually as the sheet is unwound. A sheet length measuring sensor or rotary encoder is provided in the paper feed path through which the packaging sheet unwound from the paper roll is fed toward the packaging unit. An angle sensor is provided which comprises Hall element sensors provide on a support shaft and magnets provided on a core pipe of the paper roll. Any change is the signals from one of these sensors relative to the signal from the other sensor is used to calculate the paper roll winding length, and the sheet tension is adjusted to an optimum, constant level by controlling the sheet braking force stepwise according to the roll diameter measured by the sensors.