JPH11509897A - Yarn twisting head with motor - Google Patents

Abstract

(57) Abstract: Motorized heads for multi-head machines for twisting yarns or for similar processes: support pivots (2) for yarn spindles or reels (3); A rotor (5) coaxial with the pivot axis for twisting; and a motor connected to the rotor for rotating the rotor at a controlled speed. For each head the motor consists of a single electric motor (8) of the high efficiency brushless type with cylindrical permanent magnets, directly coupled to the rotor (5). The electronics for speed and power control (11) are independent of the other head circuits and are coupled to the motor. The electronic circuit (11) for speed and power control is a miniaturized frequency converter built into the motor shell.

Description

DETAILED DESCRIPTION OF THE INVENTION                       Yarn twisting head with motor The invention provides a model for processing a twisted yarn of the type defined in the preamble of claim 1. Data-related head. Twisting such as spinning machines, twisting machines, spiral cover machines, folding machines, yarn processing machines, winding machines, etc. Conventional machines for processing yarn use a processing head, which is twisted The thread is unwound and also undergoes twisting, spiral covering, folding or other similar operations In between, it has the purpose of supporting a spindle or spool of twisted yarn. Each head is supported by a fixed support for the spindle and about 15,000 rpm Is basically formed by a rotating part that moves the twisted yarn at a high speed. With conventional machines , The rotation is arranged in sliding contact with a pulley formed on the head axis, eg annular Transfer motion to a long row of heads with belt-like, rather obsolete transmissions Provided by a single moving motor. The same motor is driven by gears, linkages and various transmissions, Or the vibration of the yarn guide eye or the rotation of the yarn spooler or winder. It can also be used to activate other movements of the machine. In this case, the speed of a single motor of the machine is controlled by an adapted electric circuit. To change the head speed, for example, to change the processing type, the gear, and thus It is necessary to manually change the transmission ratio between the motor and the shaft of the individual head. This configuration allows all components to slow down during the process in the event of a power failure, This has the advantage of not causing tension or breakage of the twisted yarn. But, This configuration has several disadvantages: First of all, conventional machines have very large noise. Generates noise and has low mechanical efficiency. In fact, ordinary sized machines May have 100 to 300 heads driven simultaneously by the transmission These heads are subject to considerable friction and impact, and up to 100 decibels overall. Generates a bell noise level. For this reason, personnel must always wear protective earplugs or heads. Must be worn, but these can cause irreparable damage to the auditory system. Often they do not completely eliminate the danger and do not comply with health regulations. Furthermore, due to the friction of significantly more moving parts, the efficiency of these mechanisms is very low. It is notorious for, and has a significant effect on power consumption. Third, current transmission systems are less accurate with substantial slip like belts High precision is not guaranteed due to the use of gearing. Some manufacturers provide a separate motor, for example, an asynchronous motor, for each head. Have tried to solve these problems. 100 watt or less power Different motors are supplied by a single frequency converter for economy Controlled. On the one hand this solution solves the noise problem, but on the other hand asynchronous motors The high slip is notorious, and the accuracy of speed control is not improved. Also this Since these motors have an efficiency of around 50% when they have a low power rating, Consumption is not improved. More recently, some manufacturers have considered using a frequency converter for each individual motor. Although this can achieve the accuracy goals, it also has power consumption problems and cost savings. Problem is not solved; in fact, the latter problem is due to the increasing number of machine components Worsen. Finally, the above solution lacks synchronization between the various movements in the event of a mains power failure. Disadvantages are not eliminated, and there is a considerable amount of twisting or integrity during power supply transients. Cause problems. The purpose of the present invention is to characterize low noise, high efficiency, low cost and very compact dimensions. Provided is a motorized head having a long rotating spindle, especially for twisting yarn processing. By doing so, the above disadvantages are eliminated. This purpose, and others that will become apparent below, is that the motor arrangement is High efficiency brushless type single electric motor coupled to contact rotor and other heads Electronic circuits for speed and power control coupled to the electric motor independently of the circuit Having a rotary spindle of the type specified at the outset, characterized in that Achieved by a motorized head. This type of head has low noise because it does not use conventional transmissions, Low power consumption due to the use of a highly efficient brushless motor. Also this model Have high precision due to the fact that they use a separate control circuit. Preferably, the motor speed and power control circuit is built into the motor frame This is a downsized frequency converter. Both the power supply current of the control circuit of the converter and the current supplying power to the motor are low voltage. Yes, eliminate any danger for personnel in charge. Heads with these characteristics also enable mass production of custom integrated circuits. This makes it possible to achieve a reduction in manufacturing costs. Still other properties and advantages are provided by the present invention, illustrated by way of non-limiting example only, in the accompanying drawings. It will be clear from the description of the following embodiment of the head. FIG. 1 is a schematic side view of a head having a rotating spindle according to the present invention. FIG. 2 shows a twisted yarn using a series of heads with a rotating spindle according to the invention. It is an electric circuit of a processing machine. In FIG. 1, a head according to the invention is indicated generally by the reference numeral 1 and comprises a twisted yarn. A hollow pivot shaft 2 serving as a support for a spindle or reel 3; 4 is open in the upper region to allow the passage of 4. The lower part of the spindle 3 is twisted A hollow central shaft 6 connected to the pivot 2 for the passage of the thread 4 and to a radial hole 7; Are surrounded by a rotor 5 having The shaft 6 of the rotor 5 is directly connected to the operating motor 8. Preferably, the shaft 6 is formed monolithically from the shaft of the motor 8. The motor 8 is twisted to allow compatibility with other heads of the same type and head 1. For fixing the whole head to a support frame 10 of a yarn processing machine, for example a twisting machine Can be provided with a stud 9. The motor 8 has a brushless type, a cylindrical permanent magnet, and is actually based on the invention. For power levels as low as 70 watts, as required by the head, It has a high efficiency between 80% and 85%. For the above purposes, a computer hard drive Circles previously used for hard disk, compact disk and similar devices A small brushless motor with a cylindrical permanent magnet is used. The frequency fluctuation speed conversion device 11 controls the motor 8 to control the power and speed of the motor. As a function of the type and thickness of the twisted yarn to be processed and Instantly adapts motor power and speed without manual or mechanical actuation You. In addition, the speed conversion device allows an error of less than 1% with respect to the preset speed. Very accurate speed control is guaranteed. Preferably the transducer 11 is plugged and integrated into the frame of the motor 8 As well as being supplied with the motor, it is smaller than previous heads. Achieve compactness. The converter 11 is connected to the power bus by a cable 12 and Connected to a microprocessor-based central management unit 14. unit 14 is coupled to each individual head by a different device, for example a respective transducer 16 Connected to another motor 15 to operate the twisted guide eye or winder can do. For example, the P.C. I. D. Closed loop adjustment using a regulator Circuit 17 is provided, and this circuit is provided for individual heads in the event that the mains power supply fails. With the purpose of synchronizing the deceleration of the head with the deceleration of other devices coupled to the individual head This circuit is in the name of the same Applicant as the present application and is subject to Italian patent application no. VI95 This is the model disclosed and claimed in A000112. Preferably, the power supply current of the motor 8 is low, for example, 48V. In this way, It is possible to use the same bus to feed the converter in A significant reduction in insulation costs, and personnel are free from the risk of electrocution. The safe handling of the head increases the intrinsic safety of the unit You. From the above description, it can be seen that a motorized head having a rotating spindle according to the present invention It is clear that the intended purpose and all the objectives are achieved, and especially High efficiency, its low noise level and its compact dimensions, flexibility and safety Sex is pointed out. Many modifications and changes are possible in the motorized head according to the present invention, and those modifications are provided. All positives and modifications are within the inventive concept as set forth in the appended claims. It is in.

────────────────────────────────────────────────── ─── Continuation of front page    (81) Designated countries EP (AT, BE, CH, DE, DK, ES, FI, FR, GB, GR, IE, IT, L U, MC, NL, PT, SE), OA (BF, BJ, CF) , CG, CI, CM, GA, GN, ML, MR, NE, SN, TD, TG), AP (KE, LS, MW, SD, S Z, UG), UA (AM, AZ, BY, KG, KZ, MD , RU, TJ, TM), AL, AM, AU, AZ, BB , BG, BR, BY, CA, CN, CZ, EE, GE, HU, IL, IS, JP, KE, KG, KP, KR, K Z, LK, LR, LS, LT, LV, MD, MG, MK , MN, MW, MX, NZ, PL, RO, RU, SD, SG, SI, SK, TJ, TM, TR, TT, UA, U G, US, UZ, VN

Claims (1)

[Claims] 1. Modes for multi-head machines for twisting yarns or for similar processes Head comprising: for a twist spindle or reel (3) And a rotor coaxial with said pivot shaft for untwisting and twisting the twisted yarn. And (5) connected to the rotor to rotate the rotor (5) at a controlled speed. A motor device comprising: The motor device is a single unit of high efficiency brushless type directly coupled to the rotor (5). Electric motor (8) and a speed coupled to said motor independently of other head circuits. And an electronic circuit (11) for power and power control. Head with motor. 2. The shaft (6) of the rotor (5) is built into the shaft of the motor (8) The motorized head according to claim 1, wherein: 3. The high-efficiency brushless motor (8) has a cylindrical permanent magnet. The motorized head according to claim 1. 4. A circuit (11) for controlling the speed and power of the motor comprises a motor frame. The motor with the motor according to claim 1, wherein the motor is a miniaturized frequency converter built in the camera. Head. 5. 5. The control circuit of the converter and the power supply current of the motor are both low voltage. The head with a motor according to the above. 6. The integrated circuit for controlling the speed and the power of the motor is provided by a main power supply. In the event of a source failure or gap, the speed of the head and other equipment connected to the head Connected to an external closed loop circuit (17) for synchronizing the speed of the device. 6. The head with a motor according to 5. 7. The integrated circuit and the external closed loop control circuit for speed and power control Channels control the definition of various head operating parameters The motorized head according to claim 6, which is connected to the control unit (14). 8. The connection between the internal integrated circuit and the external circuit may be a serial type connection or 8. The motor according to claim 7, wherein is selected between shift register connections. head. 9. The control circuit (11, 14, 17) is of the microprocessor type; 9. The motorized head according to claim 4.