Abstract: A device for feeding yarn to a textile machine, including a main body defining an entry portion and an exit portion for yarn; a rotatable drum for winding the yarn originating from the entry portion and a motor connected to the drum for rotating the drum; a control member active at least on the motor to regulate its torque and velocity; exit portion being selectively switchable between a first configuration in which it defines a free exit section for the yarn, through which the exiting yarn defines a closed path about a rotation axis of the drum, and a second configuration in which it defines a limited exit section, through which the exiting yarn defines an open path.

Abstract: A device for sensing the change of feed bobbin for a yarn fed to a textile machine and originating from a first bobbin or a second bobbin connected together in head-tail manner includes at least one first sensor and one second sensor at a passage section of a support body, a control unit associated with the first sensor and second sensor. The first sensor and the second sensor generates first and second presence signals when the yarn unwound from the first bobbin or from the second bobbin passes in front of the first sensor or second sensor. The control unit receiving as input the first and/or second presence signal to generate at least one output signal representative of the first bobbin or of the second bobbin on the basis of the first or second presence signal.

Abstract: A device for sensing the change of feed bobbin for a yarn fed to a textile machine and originating from a first bobbin or a second bobbin connected together in head-tail manner includes at least one first sensor and one second sensor at a passage section of a support body, a control unit associated with the first sensor and second sensor. The first sensor and the second sensor generates first and second presence signals when the yarn unwound from the first bobbin or from the second bobbin passes in front of the first sensor or second sensor. The control unit receiving as input the first and/or second presence signal to generate at least one output signal representative of the first bobbin or of the second bobbin on the basis of the first or second presence signal.

Abstract: A method for feeding a yarn with constant tension and constant velocity or quantity to a textile machine the processing point of which is distant from a spool from which the yarn unwinds. A first feed control and regulator loop provided presenting first tension measurer and regulator for the yarn. Velocity measurer forming part of a second control loop is provided in proximity to the point or zone to measure this velocity. The yarn feed tension is regulated on the basis of the measured velocity datum to achieve a desired prefixed velocity value at the processing zone or point.

Abstract: A device for feeding a yarn to a textile machine includes a housing with which a rotary member is associated to cooperate with the yarn unwinding from a package and directed, on leaving the device, to the machine where it is processed. Correct feed of the yarn is monitored by a feed controller associated with the housing in accordance with at least one measured parameter related to the rotary member or to an intrinsic characteristic of the yarn such as its tension or its feed velocity. A yarn cutting member is provided. This is connected to and controlled by the controller on the basis of the measured parameter of the yarn. The cutting member is activated by the controller to cut the yarn whenever the parameter monitored by the controller has a value exceeding a predetermined required value.

Abstract: A device to enable yarn to be fed for textile applications and the relative turns to be separated. The device includes a wheel/drum directly or indirectly motorized for rotation about its axis, the wheel/drum presenting in its lateral surface a series of slits to receive relative blades the projecting profile of which enables the yarn turns wound on the wheel/drum to advance. The blades form an assembly which rotates together with the wheel/drum but about an axis having an inclination and/or an eccentricity relative to the axis of the wheel/drum, such that the profile projection of the blades from the relative slits varies gradually along the perimeter of the wheel/drum, from a minimum to a maximum, to then return to a minimum, but remains constant with time. The blades have a length to be able to receive all the yarn turns which concern the device.

Abstract: A device for cutting a textile yarn during its feed to an operator element such as a textile machine for its processing or a member for feeding it to such a machine. The device includes a blade member inserted into a housing presenting at least one aperture for passage of the yarn, the blade member carried by a movable support element subjected to an actuator for its movement. The movable support element being able to assume two working positions, a first position in which the blade member is spaced from the yarn and a second position in which the member cooperates with the yarn and cuts it. The actuator include a bistable electromagnet, a spring mounted about the movable support member urging the blade member into the cutting position.

Abstract: A method and device for automatically measuring the yarn length absorbed by a rectilinear machine adapted to produce an article and including a carriage movable to-and-fro over a needle bed between two ends of a working path, needles moving towards the carriage to cooperate with the yarn (F) and form an article, the yarn unwinding from a feeder with elements for measuring the yarn quantity fed at constant tension towards the needle bed. The feeder measures and constantly monitors the yarn feed velocity, this monitoring enables the fed and knitted yarn quantity to be obtained in real time and each measurement to be associated with the respective carriage travel stroke, this information enabling precise regulation of the knitting cams.

Abstract: A method for feeding a yarn or thread to a processing machine, such as a textile machine, the method includes unwinding the yarn from a bobbin, bringing it into cooperation with a rotary member and then directing it to a sensor member arranged to verify its feed tension to the processing machine, with monitoring of the yarn feed velocity. The measured tension and measured velocity data being fed to a control unit which controls the yarn feed to the machine. The tension is continuously controlled by the unit to maintain it constant then, if this tension condition is verified, the velocity is controlled to render it constant, while at the same time the tension value is continuously monitored to verify whether it remains constant. This constant tension and constant velocity control of the yarn feed to the processing machine being implemented without synchronization with the machine.

Abstract: Device and method for constant tension feeding, threads or yarns fed to textile or winding machine or metallic wire to similar machine, in discontinuously with phase sequences. The thread motion has at least first and second feeding or absorption states following each other in time. A controller, connected to a tension detector and thread accumulator, intervenes on the accumulator based upon tension value from the detector. A compensator, between the accumulator and tension detector, cooperates with thread to compensate variation of feeding or absorption state of the thread upon passage between each first and second feeding or absorption state. The controller intervenes to modify the accumulator's action on thread and maintain tension value detected by the detector at set value. Interaction between thread and compensator keeping constant tension value during the changing phase of the feeding state. The compensator freely moveable under action of thread relative to a resting position.

Abstract: A method and device for automatically measuring the yarn length absorbed by a rectilinear machine adapted to produce an article and comprising a carriage (3) movable to-and-fro over a needle bed (1) between two ends of a working path, needles (2) moving towards said carriage (3) to cooperate with the yarn (F) and form an article, said yarn unwinding from a feeder (5) comprising means for measuring the yarn quantity fed at constant tension towards said needle bed; the feeder (5) measures and constantly monitors the yarn feed velocity, this monitoring enabling the fed and knitted yarn quantity to be obtained in real time and each measurement to be associated with the respective carriage travel stroke, this information enabling precise regulation of the knitting cams.

Abstract: A system for controlling the feed of a yarn to a textile machine or a metal wire to a coil winder. The yarn or wire unwinds from its spool and cooperates with a rotary member associated with its own rotation actuator before being directed to the machine. The yarn or wire has a characteristic value of tension and/or speed and/or quantity during this feed, and the actuator has a stator and a rotor acting on an exit drive shaft, which has its own piloting arrangement. The rotary member about which the yarn or wire winds is keyed onto the exit drive shaft. This control system measures the angular position of the drive shaft and compares an instantaneous parameter of that angular position to a prefixed characteristic value of the yarn or wire Command signals are then fed to the actuator's piloting arrangement to conform the instantaneous parameter with this prefixed value.

Abstract: A modular element of creel including a structure having at least one support suitable to support a reel or yarn spool; the structure is in the form of a solid polygon and includes a feeder device suitable to allow the feeding of the thread developed by such spool with at least one characteristic, selected from the characteristics of tension and speed, maintained constant and equal to a preset fixed value or function of the operational phase of the machine. The structure is able to be modularly coupled to other similar structures to allow the feeding of more yarn to a textile machine. Every yarn fed by every modular element having its own selected characteristic defined by the feeder device associated with such modular element.

Abstract: A method for feeding a plurality of yarns with constant values of fed length to a textile machine, each yarn unwinding from a spool and cooperating with a feed device, arranged to maintain the tension of the yarn at a predefined constant value before being directed to the textile machine. At least one control unit controls the feed to this machine such that an absorbed yarn length value to be maintained for each yarn fed to the textile machine is set or self-learnt. After measuring an actual value of the yarn length absorbed by this machine and comparing it with this predefined value, the control unit acts upon one or more feed devices and modifies the tension value of the corresponding yarn in order to make these absorbed yarn length values equal to the predefined value. A method for implementing this method is also claimed.

Abstract: Sensor for controlling thread or yarn feed to a textile machine wherein a body or casing suitable for being arranged on a support of the machine or positioned near to it and having detection methods suitable for detecting at least one feed characteristic of the yarn to the machine. In the casing or body of the sensor, resources are provided for control of the detection and suitable for modifying the modes of control according to a plurality of control algorithms stored in memory associated with the casing; associated with the latter, selector methods are also provided suitable for allowing a user to choose one of the algorithms, thus selecting the desired operating mode of the sensor during its yarn feed control. The method for selecting desired sensor operating mode is also disclosed.

Abstract: A method for feeding a yarn (F) under constant tension to a yarn processing point of a textile machine (T) distant from spool (2) or equivalent support from which the yarn (F) unwinds, the tension of said yarn (F) being controlled in proximity to the spool (2) such that this parameter is monitored and controlled immediately after the yarn (F) has been unwound from the spool (2), the yarn (F) fed to the textile machine (T) cooperating, before reaching said processing point on the machine (T), with a series of thread guide elements (8) which modify the tension of the regulated tension. A second tension control is effected in proximity to the textile machine (T), said control being used for further adjustment of the tension of the yarn (F) in proximity to the spool (2) to hence regulate the tension of the yarn (F) entering the machine (T) to a predetermined constant value.

Abstract: A device for controlling the feed of a yarn to a textile machine operating intermittently on the yarn, there being provided elements to sense the tension of the yarn and elements for measuring and modifying its feed speed, all connected to control and regulator elements for the tension and speed parameters, which continuously measure the values of both parameters during the feed of the yarn to the textile machine so as to act on a rotary member in order to modify the tension of the yarn when necessary. The rotary member is movable in a controlled manner in the two opposing directions of rotation to feed the yarn to the textile machine or to rewind it in order to prevent its accumulation in correspondence with the machine, the tension of the yarn fed or rewound being maintained at constant values.

Abstract: Device and method for constant tension feeding, threads or yarns fed to textile or winding machine or metallic wire to similar machine, in discontinuously with phase sequences. The thread motion has at least first and second feeding or absorption states following each other in time. A controller, connected to a tension detector and thread accumulator, intervenes on the accumulator based upon tension value from the detector. A compensator, between the accumulator and tension detector, cooperates with thread to compensate variation of feeding or absorption state of the thread upon passage between each first and second feeding or absorption state. The controller intervenes to modify the accumulator's action on thread and maintain tension value detected by the detector at set value. Interaction between thread and compensator keeping constant tension value during the changing phase of the feeding state. The compensator freely moveable under action of thread relative to a resting position.

Abstract: A device for the optical analysis, including two-dimensional, of a thread or yarn (F) fed to a textile machine, said device comprising at least one light emitter element (3, 4) and at least one receiver element (5), said emitter element (3, 4) generating a light signal which strikes said thread (F) before being sensed by the receiver element (5) which, based on this sensing, defines a characteristic of the thread (F) such as its movement or its stoppage, a dimensional defect or another dimensional characteristic, between said light emitter element (3, 4) and said receiver element (5), there being interposed light transparent means (6) which are encountered by the light signal after it has interacted with the thread (F), and which act as a thread guide.

Abstract: A device for controlling the feed of a yarn to a textile machine operating intermittently on the yarn, there being provided elements to sense the tension of the yarn and elements for measuring and modifying its feed speed, all connected to control and regulator elements for the tension and speed parameters, which continuously measure the values of both parameters during the feed of the yarn to the textile machine so as to act on a rotary member in order to modify the tension of the yarn when necessary. The rotary member is movable in a controlled manner in the two opposing directions of rotation to feed the yarn to the textile machine or to rewind it in order to prevent its accumulation in correspondence with the machine, the tension of the yarn fed or rewound being maintained at constant values.