CN1041410A - Determine the method and apparatus of yarn speed on textile machines - Google Patents

Abstract

The yarn is wound on a conical bobbin by means of a cam cylinder which oscillates the yarn laterally back and forth between the ends of the bobbin. A first sensor is used to determine the rotational position of an element which rotates synchronously with the bobbin. The yarn position in the direction of the longitudinal axis of the bobbin tube is determined with a second sensor. The correction factor for determining the instantaneous yarn feed speed from the mean value of the yarn speed obtained from the peripheral speed of the rotating element is obtained in this way. This improved yarn speed determination method can provide an online map of the yarn wound on this type of textile machine. Furthermore, when measuring the length of a yarn defect, a considerable degree of accuracy can be achieved.

Description

Determine the method and apparatus of yarn speed on textile machines

The present invention relates to be used to be determined at and a kind ofly yarn is wrapped in one is generally the conical yarn tube that rotates, simultaneously the method for the yarn speed on the weaving loom of this pattern that laterally swings back and forth along the length direction of yarn tube of this yarn.More precisely, the present invention relates to a kind of yarn is wound in the mode of intersect twining and adopts the driven pattern cylinder that is connected with the bobbin spool so that the two is driven Weaving device on the bobbin spool of rotation.

Swiss Patent application CH-A-636 discloses a kind of method in No. 323 files, wherein adopts an impulser to calculate to the circumferential edge speed with the synchronous rotating element of yarn speed of operation.When adopting this method to calculate yarn speed, resulting is a mean value, and this mean value always can not satisfy actual requirement, because the of short duration change of instantaneous velocity also can cause producing error when some yarn parameter of calculating.

In the very big taper yarn tube of tapering, can reach 200% as the small end of bobbin spool and the difference of the coiling diameter between the big end.So just cause the transient change on the yarn speed, no matter this instantaneous velocity changes is that end greatly or small end to being wound into the yarn tube diameter almost is the same.If directly apply to the winding frame, then this variation just can provide a useless spectrogram to calculate, and perhaps when the yarn parameter of the length aspect of calculating such as slubbing and card nailing neps, this variation also can cause sizable error.

The objective of the invention is when yarn speed calculating is carried out in the requirement of considering various inspection process and so on, to improve computational methods recited above by considering transient change.

Diameter by determining the bobbin spool and realized purpose of the present invention so that calculate instantaneous yarn speed by the resulting average yarn speed of the circumferential speed of rotating element along the yarn instantaneous position of the y direction of bobbin spool and by deriving a correction factor.

According to the present invention, be used for determining weaving loom, the degree as the method for the yarn speed on twining frame can be improved to so promptly can be calculated the online spectrogram of institute's winding yarn on this weaving loom.In addition, when measuring the length of yarn defect, can reach quite accurate degree.

The invention still further relates to the equipment that is used to realize described method.This equipment has a first sensor that is used to detect the circumferential speed of rotating element, and one is used to differentiate that the Signal Processing device that sent by sensor and one also are to be connected on the processor so that make second sensor of its instantaneous position that can determine the yarn on the bobbin spool.

Mode with one exemplary embodiment is explained in more detail the present invention below with reference to accompanying drawings, wherein:

Fig. 1 is a fundamental diagram that embodies the weaving loom part of equipment of the present invention;

Fig. 2 is a view of observing along the direction of the arrow II of Fig. 1; With

Fig. 3 is a block diagram according to system of the present invention.

Fig. 1 and Fig. 2 show the various piece of twining frame, and be next to clearly showing according to method of the present invention and relevant equipment among the figure.Yarn 1 is by gage outfit 2 operations that are used for detecting with known method the defect position of yarn, and this yarn can cut off by the inset type cutter sweep that can remove the defect part.This yarn 1 moves subsequently to be crossed a pattern cylinder 3 and is wound on the bobbin spool 4.This pattern cylinder is activated and this bobbin spool 4 rotates by CONTACT WITH FRICTION.Yarn tube 4 will be identical with the circumferential speed of the pattern cylinder 3 that drives this yarn tube 4 at the circumferential speed on the cross section between the both ends.Therefore, the circumferential speed of pattern cylinder 3 has been determined the speed of wrap of yarn and its speed of service of passing through gage outfit 2.

The speed of pattern cylinder 3 is in order to the time basis of the defect span access location length that calculating detects by gage outfit 2 to be provided.For this purpose, utilize first sensor 6 to scan and convert to the pulse of equal length to the groove on the outer panel that puts 5 of this pattern cylinder.Because it is not purpose of the present invention that these grooves and their scanning detect, and does not need to discuss herein.Can be about this respect with reference to Swiss Patent application CH-A-636, No. 323 files, this document is as the coherent reference data of the application's book.

The signal that this sensor is sent when the groove on the first sensor 6 detection panels 5 is provided for the measurement of the average speed of yarn 1.But the instantaneous velocity of this yarn is along with the position of yarn and the diameter of bobbin spool 4 change.Resulting speed is to be decided by its tapering size when twining on the minimum and maximum diameter at bobbin spool 4, and its ratio can reach 3: 1 even be bigger.

According to the present invention, one second sensor device 7 is used to measure the yarn position along the y direction of bobbin spool 4, so that determine the significant instant speed of yarn 1.Be used for, predetermined correction factor table of given winding frame can be derived out by the yarn position and the instantaneous diameter of bobbin spool 4.Adopt this correction factor, instantaneous yarn speed can by derive the name of coming from the signal of first sensor 6 or mean value calculation come out.So then provide this formula: instantaneous yarn speed equals average yarn speed and multiply by correction factor.

Adopt the instantaneous yarn speed that in this way calculates just to make it directly prepare out online spectrogram for the yarn on the winding frame.And, when carrying out the linear measure longimetry of yarn defect, can obtain quite high accuracy by gage outfit 2.

The instantaneous diameter of bobbin spool 4 is to have how many yarns to be wrapped in a function on the bobbin spool.It can directly be measured by an additional sensor (as a gauge head supporting that is placed on the top of yarn tube), also can be by the winch spool parameter that limits such as green diameter, full winding diameter and by pattern cylinder 3 to the winding number of being carried out around full winch spool for the computational methods indirect determination on basis.

There are several possible embodiments and arrange layout for second sensor device 7.This sensor device 7 can be installed in, and for example near the overcoat place of pattern cylinder 3, also can combine with gage outfit 2, as shown in FIG..In addition, sensor device 7 can take the whole intersection of row's sensor (for example photodiode) crosscut yarn 1 to twine distance (a).Perhaps can detect existence at such end position (for example yarn 1 can interdict the light beam of the detector system on this reversal point) yarn with a sensor that is arranged on one or two reversal point of intersect twining distance (a).Under first kind of situation, point is determined immediately comes out for each of this yarn position.Under second kind of situation, have only that two end points (perhaps even have only one of them) are determined to come out, and all the other each points are to adopt the pulse measurement that sent by first sensor 6, because the winding number of the pattern cylinder 3 between the continuous breaking part of the light beam that is interdicted by yarn 1 is known.

Fig. 3 shows the block diagram of a system that handles according to the method described above.According to this block diagram, this system comprises: gage outfit 2, previously described cutting element 8, a stop mechanism 9 and an electric processing and a control device 10 that comprises processor 11 of Shi Yonging in case of necessity.Processor 11 is accepted by gauge head 2 through an amplifier 12 and the signal that analog-digital converter 13 sends.This processor is also accepted by first sensor 6(Fig. 1 and Fig. 2 of being positioned on the pattern cylinder 3) through a pulse shaping device 14 signal that sends and the signal that is used to represent yarn position from second sensor 7.

These signals connect by following manner in this processor, and promptly yarn is to be combined in the yarn tube turned position groove on the pattern cylinder to be tightened up on any set point at yarn tube and to measure so that set up on the length of this yarn tube this yarn just in time moving back and forth between the big end of conical yarn tube 4 and the small end.Therefore, the instantaneous value of yarn speed (and make thus length of yarn must in a given time cycle) just can be measured on the basis of sensor 6 and 7 data that provided.And be used for further measuring work.

Processor 11 is being controlled to count by yarn and is being adjusted gain controller 15, takes into account the signal drift measured value in gage outfit 2 and activates cutting element 8 in case of necessity and/or the additional function of lugs 9 by drift correction device 16.Control and pilot signal can similarly show on display pannel 17.

And this system can also dispose a thread monitor 18 easily.Handle by this way in processor by gage outfit 2 with by the signal that first sensor 6 is sent here, promptly all pass through monitoring from the measurement result of gage outfit 2.If these results are because the natural inhomogeneities of yarn is carried out constant variation, just produce a sign that makes yarn can pass through gage outfit 2.But, if measurement result through after the predetermined measuring period number still, this processor just assert that this result represents the sign that yarn loses or stopped.

For example, yarn is disconnected.Then thread monitor 18 just can activate relevant control function.

The present invention also has can be with the signal of gage outfit 2 and the performance of carrying out comprehensive excellence from the signal of sensor 6 and 7.When sending given umber of pulse here by first sensor 6, if omitted from the signal of second sensor 7, although send the signal of variation here by gage outfit 2, this can think and indicates that yarn does not normally swing back and forth along the y direction of yarn tube.When such situation took place, this windings just should be out of service as soon as possible and by the operator error be revised.

Claims (19)

1. It is used to determine the yarn speed on a textile machine of the type that uses a driven cam cylinder that can rotate with the bobbin to wind the yarn on the bobbin in a cross-winding manner. , the method comprising: calculating the peripheral velocity of a rotating element with respect to the running yarn velocity, and wherein both the bobbin diameter and the instantaneous position along the longitudinal axis of the bobbin are determined in order to derive a correction coefficient with which the instantaneous yarn speed value can be calculated from the average yarn speed obtained by the peripheral speed of the rotating element. 2. The method of claim 1, wherein the instantaneous diameter of said bobbin is measured using an additional sensor. 3. The method of claim 1, wherein the instantaneous diameter of the bobbin is calculated on the basis of the diameter of the original bobbin, the diameter of the full bobbin and the number of revolutions of the above-mentioned rotating element when the bobbin is fully wound from. 4. The method according to claim 1, wherein the instantaneous yarn speed is determined by the following formula: the instantaneous yarn speed is equal to the correction factor multiplied by the average yarn speed. 5. A method as claimed in claim 4, wherein the cross-section of the yarn is measured using a measuring head, wherein the signals from the measuring head and the first and second sensors are based on whether there is a pulse at a given pulse from the second sensor. The signal within a range of numbers, the variable signal from the first sensor, the signal from the measuring head is discriminated, and, if there is no signal from the second sensor, it is considered that the yarn has passed through the master cylinder. broken. 6. An apparatus for implementing the method of claim 1, comprising a first sensor for detecting the speed of the rotating element, a processor for discriminating the signal sent by the first sensor, a A second sensor connected to the processor for determining the instantaneous position of the yarn on the bobbin. 7. Apparatus as claimed in claim 6, wherein said second sensor comprises a photodetector arranged at at least one of two switching points on the cross-winding path of the yarn and actuated by a beam shield. 8. Apparatus as claimed in claim 7, wherein said detector is a photoelectric detector, wherein the signal generated when the yarn crosses the beam of light forms the basis for determining the instantaneous position of the yarn, and wherein the remaining position of the yarn is determined using the signal from the first sensor. 9. Apparatus as claimed in claim 6, wherein said second sensor consists of an array of photocells covering the cross-winding path of the yarn. 10. Apparatus as claimed in claim 6, further comprising a measuring head located in the yarn path and in front of said cam cylinder, said second sensor being mounted between said cam cylinder and said measuring head. 11. The apparatus of claim 7, further comprising a measuring head located in the yarn path and in front of the master cylinder, said second sensor being mounted between said master cylinder and said measuring head. 12. Apparatus as claimed in claim 9, further comprising a measuring head located in the yarn path and in front of the master cylinder, said second sensor being mounted between said master cylinder and said measuring head. 13. The apparatus of claim 10, wherein said second sensor is assembled directly adjacent said master cylinder. 14. The apparatus of claim 10, wherein said second sensor is assembled directly adjacent to the measuring head. 15. The apparatus of claim 10, wherein said second sensor forms a structural unit with said measuring head and is mounted on said measuring head. 16. In an apparatus of the type for winding yarn around a generally tapered bobbin while oscillating back and forth along the length of the bobbin, the improvement comprising a A device for detecting the position of the yarn in the above-mentioned path during the swinging path. 17. A textile apparatus comprising a yarn bobbin for driving a generally conical bobbin in rotation about its longitudinal axis while simultaneously oscillating back and forth along the longitudinal axis of the bobbin A device for feeding the yarn so that the yarn swings back and forth between the large and small diameter end portions of the above-mentioned generally conical bobbin and is wound on the bobbin; and a device for measuring the Means for the instantaneous velocity of motion in the direction of its own length, comprising means for determining the diameter of the bobbin in relation to the amount of yarn which has been wound onto said bobbin and the composition of the bobbin along the generally conical shape of the bobbin Signal generating means for the yarn lateral swing position factor associated with the instantaneous position of the incoming yarn along the length of the tube, and signal processing means connected to said signal generating means for calculating said yarn velocity. 18. Weaving equipment as claimed in claim 17, which device also includes means for detecting the cross-sectional size of the above-mentioned yarn and generating a signal indicating the cross-sectional size, and for accepting the signal just mentioned and referring to the above-mentioned calculated Yarn speed, a device for determining the length or linear position of an imperfection within the cross-section of the yarn. 19. A method of determination comprising: obtaining a nominal value representative of the average speed at which the yarn is wound in a cross-wound manner around a generally conical On the bobbin, obtaining an indication of the instantaneous position of the bobbin length relative to the yarn wound on said bobbin, estimating the diameter of the bobbin due to the yarn already wound onto the bobbin A correction factor is derived from the increase in bobbin diameter and the instantaneous position of the yarn, and is applied to the nominal value to provide a measure of the instantaneous yarn velocity.