CN1482297A - Feeding control method and device for circular knitting machine - Google Patents
Feeding control method and device for circular knitting machine Download PDFInfo
- Publication number
- CN1482297A CN1482297A CNA03153175XA CN03153175A CN1482297A CN 1482297 A CN1482297 A CN 1482297A CN A03153175X A CNA03153175X A CN A03153175XA CN 03153175 A CN03153175 A CN 03153175A CN 1482297 A CN1482297 A CN 1482297A
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- Prior art keywords
- yarn
- servomotor
- knitting
- tension force
- main motor
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- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04B—KNITTING
- D04B15/00—Details of, or auxiliary devices incorporated in, weft knitting machines, restricted to machines of this kind
- D04B15/38—Devices for supplying, feeding, or guiding threads to needles
- D04B15/48—Thread-feeding devices
-
- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04B—KNITTING
- D04B15/00—Details of, or auxiliary devices incorporated in, weft knitting machines, restricted to machines of this kind
- D04B15/94—Driving-gear not otherwise provided for
-
- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04B—KNITTING
- D04B35/00—Details of, or auxiliary devices incorporated in, knitting machines, not otherwise provided for
- D04B35/10—Indicating, warning, or safety devices, e.g. stop motions
- D04B35/18—Indicating, warning, or safety devices, e.g. stop motions responsive to breakage, misplacement, or malfunctioning of knitting instruments
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- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Knitting Machines (AREA)
Abstract
Provided is a method for controlling the feeding of a yarn in a circular knitting machine, by which the abnormal tension of the yarn can easily be stopped at low cost, when an electric source is abnormal, and to provide the device for controlling the feeding of the yarn. This method for controlling the feeding of the yarn in the circular knitting machine is characterized by making the rotation state of a servo motor (17) approach to the rotation state of a main motor (40) after the stop of the supply of the electric source, when the electric source is abnormal. Thereby, the tension of a yarn fed into a yarn-feeding section (19) approaches the tension of the yarn in a knitting section (3), and the rapid increase of the tension of the yarn between the yarn-feeding section (19) and the knitting section (3) can be prohibited.
Description
Technical field
The present invention relates to when abnormity of power supply, suitably control the yarn feeding control method and the control device of circular knitter of the tension force of yarn.
Background technology
Generally, circular knitter comprises yarn feeder, and this yarn feeder is supplied with knitting needle with yarn; Department of knitting, this department of knitting rotate the cylindrical shell that this knitting needle is received in the needle tray by the driving of main motor, form the fabric of tubular.In the past, mechanically make the interlock of department of knitting and yarn feeder, still, in recent years, following servo control circuit (servo drive system) is adopted in the driving of yarn feeder, and this circuit at lower cost, with degree of precision, servomotor (control motor) is controlled at high speed.
As above-mentioned, the occasion mechanically making the interlock of department of knitting and yarn feeder does not produce following problems, this problem refer to such as, when having a power failure, after the driving of two parts substantially side by side stopped, between department of knitting and yarn feeder, the tension force of yarn produced difference.But, because yarn feeder adopts servomotor, so have following problem.
Servo control circuit is when having a power failure, the action of phase inverter (amplifier transistor) is stopped, stop to power to servomotor, and power brake (short circuit current) automatically moves, make 2 line short circuits in 3 lines of servomotor power supply, thus, make the servomotor braking, it is stopped at once.By stopping this servomotor, realize that the stepping of the relative department of knitting of yarn is fed at once.On the other hand, because after power supply stopped, the main motor of department of knitting was because of inertia rotation continuously, so before stopping fully, need certain hour.Thus, having the tension force of feeding the yarn between department of knitting and the yarn feeder sharply increases, and produces the situation of broken end.In the poorest occasion, formed fabric and knitting needle are thrown off, and produce the situation of press-off (taking off yarn).
On the other hand,, consider to be arranged on the uninterruptible power supply of action when having a power failure, but it has price, safeguards, is provided with the problem in place etc. as the counter-measure that has a power failure.Particularly, in price, the user is caused bigger burden.
Summary of the invention
The objective of the invention is to, addressing the above problem provides a kind of when abnormity of power supply, can be easily and stop the yarn feeding control method and the yarn feeding control device of circular knitter of the unusual tension force of yarn with low cost.
To achieve these goals, the present invention relates to the yarn feeding of circular knitter is controlled, the yarn feeder of this circular knitter by being driven by servomotor supplied with knitting needle with yarn, by the department of knitting that is driven by main motor, make and admit the cylindrical shell in the needle tray to rotate knitting needle, form the fabric of tubular, when abnormity of power supply, make the rotation status of servomotor after power supply stops and main motor approaching, prevention between yarn feeder and department of knitting, the rapid increase of the tension force of yarn.
Here, " rotation status " reduces rotary speed to two motor with inertia force after referring to stop from power supply at leisure, rotation simultaneously, the rotation status of the time that stops at last (several seconds).
According to this scheme, when abnormity of power supply, make servomotor and the rotation shape of main motor of power supply after stopping approaching, thus, can make the tension force of the yarn of supplying with by yarn feeder approaching, the rapid increase of the tension force of the yarn between prevention yarn feeder and the department of knitting with the tension force of the yarn of department of knitting.Thus, can be only approaching by the rotation status that makes servomotor and main motor, just easily and at lower cost, stop the unusual tension force of yarn.
Best, keep the nonconducting state between the input terminal of above-mentioned servomotor, stop the rapid increase of the tension force of yarn.So, when abnormity of power supply, by the nonconducting state between the input terminal that keeps servomotor, the stopping very much of servo control circuit is failure to actuate with braking circuit, thus, servomotor is identical with main motor, after power supply stops, the rotation continuously by inertia, like this, the tension force of the tension force of the yarn of feeding by yarn feeder and the yarn of department of knitting produces difference hardly, can stop the rapid increase of the tension force of the yarn between yarn feeder and the department of knitting.Thus, can be easily, and stop the unusual tension force of yarn at lower cost.
Best, by the regenerated electric power of above-mentioned main motor, drive servomotor, during this period, yarn feeding continuously stops the rapid increase of the tension force of yarn.So when abnormity of power supply, servomotor drives by the regenerated electric power of main motor, yarn feeding continuously, thus, the tension force of the tension force of the yarn of feeding by yarn feeder and the yarn of department of knitting produces difference hardly, can stop the rapid increase of the tension force of the yarn between yarn feeder and the department of knitting.Like this, because servomotor and main motor keep synchronous, so can more correctly stop the unusual tension force of yarn.
Description of drawings
Fig. 1 is the front view of circular knitter integral body;
Fig. 2 is the front view of yarn feeding device;
Fig. 3 is the block diagram of the yarn feeding control device of the circular knitter of expression the 1st embodiment of the present invention;
Fig. 4 (a) and 4 (b) are the block diagram of the yarn feeding control device of the circular knitter of expression the 2nd embodiment;
Fig. 5 is the block diagram of the distortion example of expression the 2nd embodiment.
The specific embodiment
Below with reference to the accompanying drawings, embodiments of the invention are described.
Fig. 1 is the front view of circular knitter, and Fig. 2 is the front view of yarn feeding device.As shown in Figure 1, this circular knitter comprises servomotor 17, and this servomotor 17 drives yarn feeding device (yarn feeder) 19; Tension pick-up 60, this tension pick-up 60 detects hello yarn tension; Middle stitch (stitch) device 30, this centre stitch (stitch) device 30 is adjusted stitch (stitch) amount; Loom number of revolutions checkout gear 23, this loom number of revolutions checkout gear 23 detects the number of revolutions of the syringe of braiding portion 3; Automatic winder 6, this automatic winder 6 are automatically reeled and are woven good fabric; Composite control apparatus 130,130 pairs of circular knitter integral body of this composite control apparatus are controlled.The servo control circuit 16 of control servomotor 17 is received in the composite control apparatus 130.In addition, in Fig. 1 and Fig. 2, the servomotor of being controlled by servo control circuit 16 17 passes through driving belt, drives yarn feeding device 19, still, for convenience, not shown driving belt.
In Fig. 1, above the upper frame 2 that supports by a plurality of supporting legs 1, be provided with department of knitting 3.Stocking yarn through thread-carrier 35, is supplied with knitting needle by yarn feeding device 19 (Fig. 2).In this department of knitting 3, by the driving of main motor 40, the cylindrical shell that not shown a plurality of knitting needles slidably are received in the needle tray rotates, and forms the fabric of tubular.A plurality of columns 4 stand on the upper frame 2, at its top, are fixed with horizontal part 5 by attaching parts.Below upper frame 2, be provided with automatically auto reeling portion 6 with formed fabric wrapping.
Fig. 2 represents the front view of yarn feeding device 19.This yarn feeding device 19 comprises the drive pulley 18 that drives by servomotor 17.From the driving shaft of this pulley 18,, drive yarn feeding device 19 by the endless belt (not shown).The connecting rod 20 of servomotor 17 by hanging down from horizontal part 5 is fixed on the retainer ring 24.Yarn feeding device 19 too, the connecting rod 21 by hanging down from horizontal part 5 is fixed on the retainer ring 4.
Fig. 3 represents to control as the yarn feeding control device of the circular knitter of the 1st embodiment of the present invention, drives the block diagram of servo control circuit 16 of the servomotor 17 of yarn feeding device 19.
As shown in Figure 3,16 pairs of servomotors 17 of this servo control circuit are controlled, and it comprises AC power 51, current transformer 52, inversion device (amplifier transistor) 53, rotary encoder 54, pulse control circuit 55.At rotary encoder 54 from this servomotor 17, send in the coded pulse of pulse control circuit 55, according to its with compare from the feedback pulse of servo control circuit 16, both errors are 0 mode, the pulse that is fit to sends servo control circuit 16 to by gate driver 56.
In addition; as when the such current anomaly of the electric voltage exception, the overcurrent abnormality that have a power failure etc.; the power supply that stops the power supply of servomotor 17 is supplied with shut-down mechanism 69, is provided with voltage detecting circuit 61, is arranged at regeneration resistor 62, electric voltage exception detector 63 and overcurrent abnormality detector 64, abnormal detection circuit 65, holding circuit 66, sequential control circuit 67 between current transformer 52 and the inversion device 53.If detect electric voltage exception, overcurrent abnormality, then in abnormal detection circuit 65, produce abnormal signal.Send this abnormal signal to holding circuit 66,, the action of inversion device (amplifier transistor) 53 is stopped, stopping to servomotor 17 power supplies by gate driver 56.In addition, when power failure, the power supply of the main motor 40 of Fig. 1 is stopped, servo control circuit 16 when detecting the abnormity of power supply of have a power failure electric voltage exception in addition, overcurrent abnormality by this abnormal detection circuit 65, is stopped power supply equally.
The unusual tension force that the servo control circuit 16 of Fig. 3 is comprised stops mechanism 70 to pass through following manner, when abnormity of power supply, do not make its action, this mode is: when abnormity of power supply, do not make 2 line short circuits in 3 lines of u, v to servomotor 17 power supply, w phase, keep the nonconducting state between input terminal I1, I2, the I3, promptly, from servo control circuit 16, remove the power brake (short circuit current) 68 in the past of representing by double dot dash line in advance, thus, when abnormity of power supply, do not make its action.At this moment, the action of following power supply to supply with the inversion device (amplifier transistor) 53 of shut-down mechanism 69 stops, and the power supply of servomotor 17 stops.Servomotor 17 does not stop as before, under the effect of its inertia force, reduces rotary speed at leisure, and rotation stops at last simultaneously at once.On the other hand, main motor 40 also after power supply stops, under the effect of its inertia force, reduces rotary speed at leisure, and rotation stops at last simultaneously.Thus, servomotor 17 and main motor 40 are all after power supply stops, pass through inertia force, realize rotation, both rotation status are near the state of near-synchronous, thus, create a difference hardly between the tension force of the tension force of the yarn of supplying with by yarn feeding device 19 and the yarn of department of knitting 3, can stop between yarn feeding device 19 and the department of knitting 3, the rapid increase of the tension force of yarn can reduce broken end significantly.
In addition, the main motor 40 after power supply stops and the rotation status of servomotor 17, the difference slightly that the difference of the inertia force of two motor of existence causes.But as following test, in the device of the 1st embodiment, though have what influence of fabric, the reparation behind the broken end needs the time hardly.On the other hand, in the device of drive brake, even be under the situation of Ultra-Low Speed of 5r.p.m in the number of revolutions of knitting machine, still almost produce broken end, press-off in complete all scopes, repairing needs the time, and in addition, the fabric of manufacturing also falls short of specifications.
(test method)
The double jersey circular knitter (the former smart mechanism of good fortune do produce, VT-LEC4C, 30inch/20gage/48feeder) in, adopt No. 30 cotton yarn, to knit stitches: interlock is carried out knitting.Observation changes the number of revolutions of knitting machine, the state of (interrupt the input power supply of knitting machine, reproduce the state that the has a power failure) knitting machine during power failure.Result of the test is listed in the table 1.
Table 1
(result of the test)
Annotate) the also increase more of damage that improves knitting needle when press-offing more because of speed, so the test of drive brake finishes with 10r.p.m..
| The rotation number of knitting machine | The state of knitting machine | Judge | |
| The 1st example device | ????5r.p.m. | 6 places break end | Very |
| ????10r.p.m. | 5 places break end | Very | |
| ????15r.p.m. | 5 places break end | Very | |
| ????20r.p.m. | 5 places break end | Very | |
| The drive brake | ????5r.p.m. | Almost full week produces broken end, press-offs | Can not move |
| ????10r.p.m. | Full week (48 place) produces broken end, press-offs | Can not move | |
| ????15r.p.m. | Test is ended | Can not move | |
| ????20r.p.m. | Test is ended | Can not move |
Like this, when abnormity of power supply, can be easily, and stop the unusual tension force of yarn at low cost.In addition, owing to adopt the power brake on the servo control circuit in the past to remove part, so can further reduce cost.
In addition, unusual tension force stops mechanism 70 also can adopt following form, does not wherein remove power brake (short circuit current) 68 with physics mode, does not make its action.
Fig. 4 (a) stops the block diagram of mechanism 70 for the unusual tension force of expression the 2nd embodiment.Fig. 4 (b) is the block diagram of expression main motor drive division.This unusual tension force stops mechanism 70 different with the 1st embodiment, after power supply stops, by the regenerated electric power of above-mentioned main motor 40, drives servomotor 17, during this period, carries out yarn feeding continuously, stops the rapid increase of the tension force of yarn.Other composition is identical with the 1st embodiment.
In Fig. 4 (a), driving belt 101 is connected with main motor 40, and driving gearbox 102 passes to gear ring 103 with the revolving force of the outlet side gear 102a of gear-box 102, make cylindrical shell 105 rotations that are arranged on the gear ring 103, thus, knitting needle (for convenience, not shown in the drawings) by being inserted into cylindrical shell 105 moves up and down, form fabric, by the driving of servomotor 17,, yarn is supplied with department of knitting 3 (Fig. 1) simultaneously by yarn feeding device 19.In addition, form following proposal, wherein, control in the following manner, this mode is: the main motor driver 127 and the servo-driver (servo control circuit) 16 of renewable electric power, dc bus 102 parallel connections with the primary side of the current transformer 52 that is connected with power supply 51, main motor 40 is connected with this main motor driver 127, and in addition, above-mentioned servomotor 17 is connected with this servo-driver 16, from following when power supply 51 has a power failure, the gear ring 103 that rotates with inertia and the main motor 40 that drives are through main motor driver 127 and the electric power of regeneration, by above-mentioned dc bus 120, supply with above-mentioned servo-driver 16, drive yarn feeding device 19.
In the occasion of power supply 51 energisings,, supply with driving electric power to main motor 40 by main motor driver 127, by servo-driver 16, supply with driving to servomotor 17 and use electric power, thus, department of knitting 3 and yarn feeding device 19 are synchronously moved, thus, form fabric.
On the other hand, occasion in power supply 51 power failures, the signal that the power cut detection circuit 128 of the power failure that is applied to detect power supply 51 is produced, stop to supply with driving electric power to main motor 40, gear ring 103 relies on inertia and rotation continuously, thus, the main motor 40 that drives from following this gear ring 103, the electric power of regenerating through main motor driver 127 is supplied with servo-driver 16 by dc bus 120, and the driving of servomotor 17 is carried out serially.Like this, yarn feeding device 19 is according to the mode synchronous with the action of department of knitting 3, continuous action, and thus, both rotation status are further approaching, can reduce from yarn feeding device 19 broken end in the scope of department of knitting 3 more significantly.Thus, servomotor 17 is realized thus, more correctly stoping the unusual tension force of yarn synchronously with main motor 40.
In addition, shown in Fig. 4 (b), main motor driver 127 has inversion device portion 129 and gating timing generating unit 130, wherein, positive and negative two-way electric current flows through this inversion device portion 129, gating timing generating unit 130 is corresponding to the signal from power cut detection circuit 128, give the gating timing signal of above-mentioned inversion device portion 129, thus, by this gating timing signal generating unit 130, the gating timing signal of inversion device portion 129 is given in generation, like this when power supply 51 energisings, can the voltage of the electric power of main motor 40 as the rotation that is suitable for main motor 40 will be supplied with by main motor driver 127, on the other hand, when power supply 51 has a power failure, can be with supply with the regenerated electric power of servo-driver 16 through main motor driver 127, as the voltage that is suitable for driving by 16 pairs of servomotors 17 of this servo-driver.
Fig. 5 represents the distortion example of the 2nd embodiment.Identical with top description, driving belt 101 is connected with main motor 40, and driving gearbox 102 passes to gear ring 103 with the revolving force of the outlet side gear 102a of gear-box 102, in addition, make 105 rotations of the cylindrical shell that is arranged on the gear ring 103, thus, follow moving up and down of the knitting needle that inserts cylindrical shell 105, form fabric, and,, yarn is supplied with department of knitting 3 (Fig. 1) by yarn feeding device 19 by driving servomotor 17.In addition, the main motor driver 127a of renewable alternating electromotive force, with the servo-driver 16a that can exchange input, with AC bus 117 parallel connections that are connected with power supply 51, above-mentioned main motor 40 is connected with this main motor driver 127a, above-mentioned in addition servomotor 17 is connected with above-mentioned servo-driver 16a, adopt the scheme of controlling in the following manner, this mode is: from when power supply 51 has a power failure, the main motor 40 of following the motion of the gear ring 103 that rotates by inertia to drive, the electric power of regenerating by above-mentioned main motor driver 127a passes through above-mentioned AC bus 117, supply with above-mentioned servo-driver 16a, make yarn feeding device 19 actions, thus, the alternating electromotive force that can need not to supply with by power supply 51 is converted to the converter that direct current is used.
Claims (6)
1. the yarn feeding control method of a circular knitter wherein, by the yarn feeder that is driven by servomotor, is supplied with knitting needle with yarn, by the department of knitting that is driven by main motor, makes and admits the cylindrical shell in the needle tray to rotate knitting needle, forms the fabric of tubular;
When abnormity of power supply, make the servomotor of power supply after stopping approaching, the rapid increase of prevention tension force of yarn between yarn feeder and department of knitting with the rotation status of main motor.
2. the yarn feeding control method of circular knitter according to claim 1 is characterized in that keeping the nonconducting state between the input terminal of above-mentioned servomotor, stops the rapid increase of the tension force of yarn.
3. the yarn feeding control method of circular knitter according to claim 1 is characterized in that the regenerated electric power by above-mentioned main motor, drives servomotor, and during this period, yarn feeding continuously stops the rapid increase of the tension force of yarn.
4. the yarn feeding control device of a circular knitter, this device comprises yarn feeder, this yarn feeder drives by servomotor, and yarn is supplied with knitting needle; Department of knitting, this department of knitting rotate the cylindrical shell that knitting needle is received in the needle tray, and produce the fabric of tubular by the driving of main motor, it is characterized in that:
It comprises that unusual tension force stops mechanism, and this mechanism makes the servomotor after power supply stops approaching with the rotation status of main motor, the rapid increase of the tension force of the yarn of prevention between department of knitting and yarn feeder when abnormity of power supply.
5. the yarn feeding control device of circular knitter according to claim 4 is characterized in that above-mentioned unusual tension force stops mechanism to keep nonconducting state between the input terminal of servomotor, stops the rapid increase of tension force.
6. the yarn feeding control device of circular knitter according to claim 4 is characterized in that above-mentioned unusual tension force stops the regenerated electric power of mechanism by above-mentioned main motor, and servomotor is driven, and during this period, yarn feeding continuously stops the rapid increase of tension force.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002234641A JP2004076172A (en) | 2002-08-12 | 2002-08-12 | Method for controlling feeding of yarn in circular knitting machine and device for controlling feeding of yarn |
| JP234641/2002 | 2002-08-12 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1482297A true CN1482297A (en) | 2004-03-17 |
Family
ID=31185147
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA03153175XA Pending CN1482297A (en) | 2002-08-12 | 2003-08-08 | Feeding control method and device for circular knitting machine |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JP2004076172A (en) |
| CN (1) | CN1482297A (en) |
| DE (1) | DE10334207A1 (en) |
| TW (1) | TWI277671B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1974905B (en) * | 2005-11-29 | 2011-03-02 | 株式会社岛精机制作所 | Knitting machine |
| CN101910491B (en) * | 2007-12-25 | 2012-07-18 | 株式会社岛精机制作所 | Weft knitting machine, and control method for mobile carrier in the weft knitting machine |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102943345A (en) * | 2011-08-16 | 2013-02-27 | 苏州华龙针织品有限公司 | Controlled tension mechanism for looms |
| TWI718393B (en) * | 2018-07-18 | 2021-02-11 | 典洋針織機械股份有限公司 | Method for detecting knitting needle selection device and knitting needle selection device with detecting system |
-
2002
- 2002-08-12 JP JP2002234641A patent/JP2004076172A/en active Pending
-
2003
- 2003-07-26 DE DE10334207A patent/DE10334207A1/en not_active Withdrawn
- 2003-08-08 CN CNA03153175XA patent/CN1482297A/en active Pending
- 2003-08-12 TW TW092122149A patent/TWI277671B/en not_active IP Right Cessation
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1974905B (en) * | 2005-11-29 | 2011-03-02 | 株式会社岛精机制作所 | Knitting machine |
| CN101910491B (en) * | 2007-12-25 | 2012-07-18 | 株式会社岛精机制作所 | Weft knitting machine, and control method for mobile carrier in the weft knitting machine |
Also Published As
| Publication number | Publication date |
|---|---|
| TW200404111A (en) | 2004-03-16 |
| JP2004076172A (en) | 2004-03-11 |
| TWI277671B (en) | 2007-04-01 |
| DE10334207A1 (en) | 2004-02-26 |
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