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

Abstract

With a pattern cylinder make yarn between the two ends of yarn tube back and forth teeter yarn is wrapped on the conical yarn tube.A first sensor is used to measure the turned position of the element that rotates synchronously with this yarn tube.The yarn position of this yarn tube y direction is measured with one second sensor.Being used for determining by the mean value of the resulting yarn speed of circumferential speed of this rotating element that the correction factor of the instantaneous feed rate of yarn comes to this obtains.This improved yarn speed determines that method can be provided at the line chart spectrum to the yarn that twines on this class weaving loom.And, when measuring yarn defect length, can reach quite high accuracy.

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, be used to measure a kind of driven pattern cylinder that can rotate with the bobbin spool that adopts, yarn is wrapped in the method for the yarn speed on the weaving loom of this pattern on the bobbin spool in the mode of intersect twining, this method comprises: calculate the circumferential speed of a rotating element with respect to operating yarn speed, and wherein bobbin spool diameter and the instantaneous position on the y direction of bobbin spool all will be measured, so that derive a correction factor, utilize this correction factor the yarn average speed that circumferential speed obtained by this rotating element can be calculated instantaneous yarn speed value.

2, method according to claim 1, the instantaneous diameter of wherein said bobbin spool are to adopt an additional sensor to measure out.

3, method according to claim 1, the instantaneous diameter of wherein said bobbin spool is at original bobbin spool diameter, twine full bobbin spool diameter and when twining full bobbin spool the winding number of above-mentioned rotating element be that basic calculation is come out.

4, method according to claim 1, wherein said yarn instantaneous velocity are to adopt following formula definite: the yarn instantaneous velocity equals correction factor and multiply by average yarn speed.

5, as method as described in the claim 4, wherein the cross section of yarn is to adopt a gage outfit to measure, wherein the signal from gage outfit and first and second sensor all is whether basis exists the signal in given umber of pulse scope from second sensor, variable signal from first sensor, differentiate from the signal of gage outfit, and if wherein not from the signal of second sensor, it is disconnected in the pattern cylinder that this just is considered to yarn.

6, a kind of equipment that is used to realize the described method of claim 1, this equipment comprises a first sensor that is used to detect the speed of rotating element, one is used for processor that the signal that is sent by first sensor is differentiated, and one is connected on the above-mentioned processor in order to be determined at second sensor of the yarn instantaneous position on the bobbin spool.

7, as equipment as described in the claim 6, wherein said second sensor comprises that at least one point that an intersection that is arranged on yarn is twined two transfer points on the distance goes up the photoelectric detector of carrying out action by a light beam shielding.

8, as equipment as described in the claim 7, wherein said detector is a photoelectric detector, wherein the signal that is produced when yarn crosscut light beam is formed for measuring the basis of yarn instantaneous position, and wherein all the other positions of yarn are to utilize the signal measuring that sent by first sensor.

9, as equipment as described in the claim 6, wherein said second sensor twines row's photocell of distance and forms by being covered with yarn crossovers.

10,, also have one and be arranged in the yarn distance and at the gage outfit of the front of pattern cylinder, above-mentioned second sensor is mounted between above-mentioned pattern cylinder and the above-mentioned gage outfit as equipment as described in the claim 6.

11,, also have one and be arranged in the yarn distance and at the gage outfit of pattern cylinder front, above-mentioned second sensor is mounted between above-mentioned pattern cylinder and the above-mentioned gage outfit as equipment as described in the claim 7.

12,, also have one and be arranged in the yarn distance and at the gage outfit of the front of pattern cylinder, above-mentioned second sensor is mounted between above-mentioned pattern cylinder and the above-mentioned gage outfit as equipment as described in the claim 9.

13, as equipment as described in the claim 10, wherein said second sensor directly is assembled near the above-mentioned pattern cylinder.

14, as equipment as described in the claim 10, wherein said second sensor is directly to be assembled near the gage outfit.

15, as equipment as described in the claim 10, wherein said second sensor and above-mentioned gage outfit constitute a construction unit and also are installed on this gage outfit.

16, in the equipment of this pattern that swings back and forth on the length of this yarn tube a kind of yarn is wrapped on the yarn tube that is generally taper and simultaneously, its improvement part is included in the device near the yarn position that is used for detecting above-mentioned distance in the swing distance of yarn.

17, a kind of Weaving device comprises that one is used to drive one and is generally that conical yarn tube rotates around its longitudinal axis, meanwhile to along the y direction of this yarn tube back and forth the yarn tube of the distance of teeter send yarn to so that this yarn is swung back and forth between the above-mentioned large and small diameter end that is generally conical yarn tube is divided, and be wrapped in the device on this yarn tube; With a kind of device that is used to measure yarn in the transient motion speed of itself length direction, this device comprises and is used to measure formation and has been wound into the amount of thread on the above-mentioned yarn tube yarn tube diameter factor that interrelates and the signal generation apparatus that constitutes the yarn teeter positional factor that interrelates with the instantaneous position that enters yarn on the length that is generally conical yarn tube, and is connected to the signal processing apparatus that is used to calculate above-mentioned yarn speed on the above-mentioned signal generation apparatus.

18, as Weaving device as described in the claim 17, this equipment also comprises the device that is used to detect the sectional dimension of above-mentioned yarn and produces the signal of this sectional dimension of sign, with the signal that is used to accept just to have mentioned and with reference to the yarn speed that aforementioned calculation goes out, be determined at the length of defect in this yarn cross section or the device of linear position.

19, a kind of assay method comprises: obtain a nominal value of representing average speed, at this speed yarn under working is to be placed on around one on the driven pattern cylinder and by its with the intersection canoe to drive being generally on the conical bobbin spool of rotating, obtain one with respect to being wrapped in yarn on the above-mentioned bobbin spool in the instantaneous position indicating value of cheese length of tube direction, appraisal is because around the recruitment of the bobbin spool diameter that yarn caused to the bobbin spool, derive a correction factor and above-mentioned correction factor is applied to above-mentioned nominal value so that measuring of a yarn instantaneous velocity is provided by the increase of above-mentioned bobbin spool diameter and the instantaneous position of above-mentioned yarn.