Abstract: An electronic device for regulating and controlling the delivery of yarn (18) coming from feed units of textile machines, which is designed to vary the r.p.m. of a d.c. brushless motor (23) so as to keep it as synchronized as possible, according to an adjustable scale factor, with the speed of the textile machine served; the device comprises the d.c. brushless motor (23) and an electronic circuit based upon operation of a microcontroller (21) that is able to control the r.p.m. of the motor (23) and the currents (I1, I2, I3) in the phases of the aforesaid motor (23).

Abstract: A system for selecting the stitch forming organs for textile machines; in particular for circular machines for knitwear, contemplates software management such as to update the status of each individual lever (28) of an activator (20), as well as in predetermined time intervals corresponding to the angular positions that occur every K needles (10) or sinkers (26), where K is the number of levers (28) in line of the activator (20), also in other time intervals corresponding to intermediate angular positions includes between 1 and K; the correct value of these angular positions is determined by the profile of the lever (28) of the activator (20).

Abstract: A tensioning unit (10) with automatic control of the tension (T) of yarn-formed fabrics (F), having a first electric card (50) mounted in an electromechanical cubicle (60) and used to set the drawing parameters or store and load applicational drawing programs, and a second electronic card (50A), identical to the first and mounted on the tensioning unit (10), and which utilizes a processing program to control an inverter (28), that is connected to a drawing motor (25), in response to a feedback signal originating from a linear position transducer (P) rigid with a spring (30) for tensioning the yarn; a third electronic card (40A) is provided to establish communication between the first electronic card (50) and the second (50A) via a serial line (54) using an infrared optical coupling system. The speed of the motor (25) is controlled on the basis of information received to the position of the spring (30), in such a manner as to maintain the yarn tension (T) constant.

Abstract: A universal circular knitting machine with a plurality of knitting stations, having two revolving cylinders axially aligned with each other surrounded by cam skirts, selection devices, stitch length regulation devices and yarn selector devices mounted on a stationary structure. Each movable element for determining needle selection and needle vertical movement, along with yarn-guide actuation, is driven by an electromechanical actuator mounted on the stationary structure. A central electronic control unit sends actuation command signals to the electromechanical actuators. The signals are synchronized with the revolution of the cylinders in accordance with a pattern corresponding to a knitted fabric to be produced.

Abstract: For a multi-feed knitting machine or hosiery machine, the system of selection of the needles is equipped, per each thread feed, with at least a stationary electromagnetic actuator, suitable for acting by magnetic attraction on wire springs incorporated inside selection sinkers inserted inside the slots under the needles and the needle pushers. An extraction cam extracts the selection sinkers and the needle pushers coupled with them from the slots, in order to bring the heels of the needle pushers to interfere with a lifting cam. A loading cam brings the springs of the sinkers into contact with the face of the actuator, wherein they are retained by magnetic force. A narrow area of the face of the actuator can be de-magnetized by impulses emitted by an electronic control system. If this area is demagnetized, the springs of the sinkers are taken by a blanking-out cam, which pushes the sinkers into their relevant slots and the heels of the needle pushers out from the field of action of the lifting cam.