CN1312407A

CN1312407A - Yarn feeding method and feeder

Info

Publication number: CN1312407A
Application number: CN 00102875
Authority: CN
Inventors: 陈仁辅
Original assignee: Individual
Current assignee: Individual
Priority date: 2000-03-06
Filing date: 2000-03-06
Publication date: 2001-09-12

Abstract

The present invention relates to a yarn-feeding method and its device, which is characterized by that after the yarn leading to the yarn-feed wheel from yarn carrier is contacted with yarn-feeding wheel and before feeding yarn the yarn is tensed, between the yarn-feed wheels and knitting machine all the yarns are straightened and being in tension state, and fed into knitting machine to make all the yarn parts hooked by needles identical in length and make formed loop uniform to attain the goal of weaving uniform cloth.

Description

A kind of yarn feeding method and device thereof

What the present invention relates to is a kind of yarn feeding method, refers to a kind of novel yarn feeding method and device thereof that is specially adapted to tubular knitting machine especially.

As is generally known, cloth cover is made up of countless yarn circles (loop), the quality of fabric quality depends on fully knits whether homogeneous of order, whether whether homogeneous is relevant with the size of yarn circle and knit the purpose homogeneous, and the homogeneous of yarn circle with knitting in the operation that interweaves the yarn section of hook yarn whether homogeneous combines.Therefore, the quality of textiles depends on whether homogeneous of yarn segment length that knitting needle hooks up, just becomes us and inquires into the important topic of improving the knitted cloth quality.

In known yarn feeding method, we improve the knitted cloth quality for asking, all manage to make and send yarn stable, in the hope of yarn pushing tension stably, the release of wherein storing up the yarn yarn-feeding device is one method of this pursuit fabric quality improvement, with regard to simple and easy yarn feeding wheel and storage yarn yarn feeding wheel, storage yarn yarn feeding wheel provides than simple and easy yarn feeding wheel and better send the yarn effect, but whether successfully down pushing in regular turn of the yarn feeding wheel periphery institute winding yarn of storage yarn yarn feeding wheel, and whether do not tangle mutually between each yarn circle, and between the circle of the front and back of each yarn circle whether wrongful displacement generation etc. is arranged, usually be that the anxious desire of dealer is inquired into improved problem.Moreover, it is fully by the gravity pressure yarn that the tension force of yarn storage wheel detects bar, when yarn tension disappears, stop immediately, the maximum disadvantage of the boundary member of only this mat gravity sag is that sensitivity is not good enough, because when its running speed of old knitting machine is slow, the timeliness of its parking, exert oneself and give acceptance, and the dealer is for asking its existence in recent years, all the running on the speed of a motor vehicle significantly improves, if broken yarn detects bar sensitivity inadequately, even its sensitivity only differs several seconds zero point, the length of weaving cotton cloth of broken hole is the length of phase difference meter just, and this loss is for the dealer, can not say not light, because more than the horizontal stripe one, broken hole is just many, and the client complains increase, situation at a discount just takes place time and again, dealer's profit reduces naturally, if things go on like this, to managing bad influence takes place just.

General storage yarn send the yarn mode, the tension force size of the yarn that its yarn storage wheel is sent, be that adjustment with knitting machine water caltrop position is related, general yarn feeding method is that yarn is entered yarn tension as far as possible before the feed of knitting machine, obtain tension force homogeneous and the uniform purpose of yarn circle to improve yarn tension, the yarn that sent by yarn feeding wheel storage yarn this moment, it is that only mat is detectd the gravity mode of knitting bar itself and detected yarn tension that its yarn yarn tension detects bar, add before above-mentioned known yarn feeding method enters yarn feed again and strain as far as possible, and that commonly uses goes out the tension force that yarn tension detects bar and can not adjust fully, and being directed at us can't declare the tension force homogeneous whether of knowing all yarns in the naked eyes mode.So general traditional methods have to be adjusted the height of water caltrop with the control yarn tension with the experience veteran, as previously mentioned for aspiring for stability the yarn that send of tension force, usually all yarn tension is transferred to as far as possible carry out knitting operation under the maximum tension scope, thus, not only the consume of knitting needle equal loss property portion product is big under running at a high speed, and the stroke of knitting needle is short, the yarn circle is little, and cloth cover broken hole rate raises, and cloth cover is easily given birth to horizontal stripe, the smoothness of cloth cover is not good enough, body texture is poor, and elasticity is also poor, and shrinkage factor also improves relatively, badly battered for the complaint of dealing with the client everyday, make the dealer suffer from not having good plan.

The long-pending more than two decades of the inventor is engaged in knitting machine and is made and sold the industry experience, inquires into and test repeatedly through long term studies, creates a kind of knitting machine homogeneous yarn feeding method finally.Therefore, the inventor's main purpose is providing a kind of homogeneous yarn feeding method and device thereof of knitting machine, commonly uses the above-mentioned shortcoming of knitting machine yarn feeding method with solution.

Another object of the present invention is to provide a kind of novel yarn feeding method and device thereof of knitting machine, be made into the evenly level and smooth beautiful again high-quality knitwear of cloth cover.

Another purpose of the present invention is to provide a kind of novel yarn feeding method and device thereof of knitting machine, and the length of each yarn circle that knitting needle hooks up is reached to greatest extent, makes each yarn circle size homogeneous again, make body have thick texture, good hand touch, elasticity is good, the high-quality knitwear that shrinkage factor is low again.

A more purpose of the present invention is to provide a kind of novel yarn feeding method and device thereof of knitting machine, and Homes Using TV and capacity utilization significantly improve, and the fraction defective of production is minimized, and the consume portion product of knitting needle etc. significantly reduce, thereby reduce production costs.

The present invention is for achieving the above object, and its method feature of taking comprises:

(1) will cause all yarns of yarn feeding wheel from the yarn tube, via yarn feeding wheel send yarn contact after, its yarn is tension in advance before sending the yarn yarn, makes it often to be under (tension) tension state;

(2) secondly will be under the moderate tension state that is not extended and directly (is with tight in the pine) from all yarns that yarn feeding wheel causes between knitting machine by reason, and when making all yarns detect bar, be to put for this tension force respectively detects bar institute bullet in a side's who send the yarn direction mode with deviation through rubber-like tension force;

(3) again mat respectively this tension force detect the attach troops to a unit adjustment of water caltrop position of bar, make all yarns detect to enter in the knitting machine under the substantially all identical condition of bar deviation one side's the amplitude of oscillation and weave through this tension force respectively;

So the yarn segment length of all knitting needle institute crocheteds is all identical, the inevitable homogeneous of formed all yarn circle sizes is to reach the purpose of weaving of cloth cover homogeneous.

Device of the present invention is for achieving the above object, the device of being taked comprise a yarn feeding wheel and attach troops to a unit one go out yarn tension detect boundary member and from yarn tube guiding yarn to the guide eye between yarn feeding wheel, boundary member, devices such as hook, it is characterized in that: this yarn feeding wheel send the yarn circumferential surface to have can how to dispose with the relevant guide eye that send yarn again around a circle or the above yarn of a circle, the stop rod of this yarn boundary member then has the spring that can adjust its amplitude of oscillation size, the big I of the amplitude of oscillation that makes this go out the yarn tension stop rod cooperates water caltrop to be adjusted, these all yarns are tension in advance before yarn feeding wheel send the yarn yarn, make it often to be under the tension state that is tightened up, these all go out yarn tension to detect bar then be that respectively this detects the yarn that bar is controlled for mode bullet pendulum with deviation one side, make the yarn segment length of each knitting needle institute crocheted that all yarns attach troops to a unit all identical, formed yarn circle size homogeneous is to reach the purpose of weaving of cloth cover homogeneous.

Above-mentioned purpose of the present invention, effect and characteristics will be illustrated and more clear with reference to the accompanying drawings.

Graphic simple declaration:

Fig. 1 is the schematic diagram of first embodiment of the inventive method and device thereof;

Figure 1A detects the lax formula bullet pendulum of bar yarn user mode amplification key diagram for the yarn of first embodiment of the invention;

Fig. 2 is the schematic diagram of second embodiment of the invention;

Fig. 2 A is that the yarn that advances of second embodiment of the invention detects bar tension formula bullet pendulum yarn user mode amplification key diagram;

Fig. 3 is the schematic diagram of third embodiment of the invention;

Fig. 4 is the front view of simple and easy yarn feeding wheel one embodiment used in the present invention.

One embodiment of the novel yarn feeding method of knitting machine of the present invention, be primarily characterized in that: will cause all yarns of yarn feeding wheel from the yarn tube, via yarn feeding wheel send yarn contact after, its yarn is tension in advance before sending the yarn yarn, makes it often to be under (tension) tension state; Inferior will being under the moderate tension state that is not extended and directly (is with tight in the pine) from all yarns that yarn feeding wheel causes between knitting machine by reason, when making all yarns detect bar again through rubber-like tension force, be with deviation in a side's who send the yarn direction mode by this tension force respectively detect bar the bullet pendulum; Again mat respectively this tension force detect the attach troops to a unit adjustment of water caltrop (not shown) position of bar, make all yarns detect to enter in the knitting machine under all identical condition of bar deviation one side's the amplitude of oscillation and weave through this tension force respectively; So the yarn segment length of all knitting needle institute crocheteds is all identical, the inevitable homogeneous of formed all yarn circle sizes is to reach the purpose of weaving of cloth cover homogeneous.

Another embodiment of the novel yarn feeding method of knitting machine of the present invention is primarily characterized in that: all yarns are given tension earlier in the yarn tube causes the process of yarn feeding wheel, make it to be sent yarn under the tensile state having; Inferior will being under the moderate tension state that is not extended and directly (is with tight in the pine) from all yarns that yarn feeding wheel causes between knitting machine by reason, when making all yarns detect bar again through rubber-like tension force, be with deviation in a side's who send the yarn direction mode by this tension force respectively detect bar the bullet pendulum; Again mat respectively this tension force detect the attach troops to a unit adjustment of water caltrop position of bar, make all yarns detect to enter in the knitting machine under all identical condition of bar deviation one side's the amplitude of oscillation and weave through this tension force respectively; So the yarn segment length of all knitting needle institute crocheteds is all identical, the inevitable homogeneous of formed all yarn circle sizes is to reach the purpose of weaving of cloth cover homogeneous.

First preferred embodiment of the new yarn feeder of knitting machine of the present invention comprise on one yarn feeding wheel and attach troops to a unit one go out yarn tension detect boundary member and-from yarn tube guiding yarn to the guide eye between yarn feeding wheel, boundary member, devices such as hook, it is characterized in that: the sending the yarn circumferential surface to have can be how to give again around a circle or the above yarn of a circle of this yarn feeding wheel send the relevant guide eye of yarn to dispose, the stop rod of this yarn boundary member then has the spring that can adjust its amplitude of oscillation size, the big I of the amplitude of oscillation that makes this go out the yarn tension stop rod cooperates water caltrop to be adjusted, these all yarns are tension in advance before yarn feeding wheel send the yarn yarn, make it often to be under the tension state that is tightened up, these all go out yarn tension to detect bar then be that respectively this detects the yarn that bar is controlled for mode bullet pendulum with deviation one side, make the yarn segment length of each knitting needle institute crocheted that all yarns attach troops to a unit all identical, formed yarn circle size one is to reach the purpose of weaving of cloth cover homogeneous.

Another embodiment of the new yarn feeder of knitting machine of the present invention comprises a yarn storage wheel, the yarn that yarn storage wheel set and go into the knitting boundary member of yarn tension, presser device and from yarn tube guiding yarn to the relevant thread-guide element between the machine of detecting, it is characterized in that: the tension force of the boundary member of this yarn storage wheel yarn one side detects bar and has the spring that can adjust its amplitude of oscillation size, make this amplitude of oscillation that goes out the yarn tension stop rod can cooperate water caltrop adjusted, this device can be with the tension in advance before yarn storage wheel send the yarn yarn of all yarns, all yarn yarns often are under the tensile state, inferior will from yarn storage wheel cause all yarns between knitting machine be in managed in the pine that directly and not is extended with tight moderate tension state under, make again these all yarns through above-mentioned respectively when this rubber-like tension force detects bar be make it with deviation one side's mode by this tension force respectively detect bar the bullet pendulum, the mat means of adjusting water caltrop make that all yarns attach troops to a unit again detects bar and enters in the knitting machine under the condition of deviation one side's the identical amplitude of oscillation and weave, make the yarn segment length of each knitting needle institute crocheted that all yarns attach troops to a unit all identical, formed yarn circle size homogeneous is to reach the purpose of weaving of cloth cover homogeneous.

For making method of the present invention obtain further to understand, be illustrated with reference to figure 1 and Figure 1A, identical or relevant spare part or parts all are marked with identical label or titled with English alphabet, so that the contrast mutually of front and back literary composition among the figure.

As shown in Figure 1, homogeneous of the present invention send in the yarn, yarn 20 is via the first guide eye 12A by yarn tube 11, the second guide eye 12B, epimere boundary member 14 and link up with 15 and guide on the simple and easy yarn feeding wheel 30, yarn 20 via yarn feeding wheel 30 send yarn contact after, its yarn 20 is straight by tension reason in advance before yarn, to be strained reason fully directly because of the yarn of the relation rolled state that uncoiling generated of curling from yarn tube 11, make it often to be under the tension state that is tightened up, and the equal mat water caltrop of all yarn 20A that will cause 40 of knitting machines from yarn feeding wheel 30 (is originally to attach troops to a unit on every knitting machine, not shown in the figures) (CAM) adjustment means, make the condition that tension rail 161 (seeing Figure 1A) all is in the identical amplitude of oscillation that detects that all yarn yarns are attached troops to a unit, make all yarn yarn 20A mats respectively this institute rubber-like of attaching troops to a unit go out yarn tension to detect bar 161 be to detect bar 161 bullets pendulum back and be in to be managed directly and not to extend required tension state and enter in the knitting machine 40 and weave with deviation in a side's who send the yarn direction mode, make the yarn segment length of all knitting needle institute crocheteds all identical, then formed yarn circle size homogeneous is to reach the purpose of weaving of cloth cover homogeneous.

Should illustrate around here, the described tension rail 161 that detects of the above-mentioned explanation of the present invention can be reached by variety of way, for convenience of explanation, boundary member 16 with Figure 1A illustrates, boundary member is known element, so the explanation of relevant assembly, for example explanations such as guide eye 164-166, contact 161A, ground wire contact 167, spring 163 and adjustment button 162 are omitted.

In the present invention carries out, yarn 20 is tightened up the straight means of reason before being sent yarn by yarn feeding wheel, its the simplest method is how yarn 20 can be reached around a circle in the periphery of simple and easy yarn feeding wheel 30, simple and easy as shown in Figure 4 yarn feeding wheel 30, which is provided with four or more guide eye 311-314, yarn is introduced the back around yarn feeding wheel 32 half-turns via guide eye 311, retread to moving through guide eye 312 down to guide eye 313, sent by guide eye 314 around the yarn feeding wheel half cycle by guide eye 313, then yarn is being the present invention with one of yarn means that tension reason in advance is straight before the yarn around Qu Fangfa between yarn feeding wheel and the guide eye 311-314 again.

Right yarn from the yarn feeding wheel yarn to all the yarn 20A between knitting machine be under the state that does not extend, make it to have tension force, and the respectively adjustment of the pairing water caltrop of this yarn of mat, respectively the bullet amplitude of oscillation degree of this yarn is all identical to make each tension force of all yarns detect pole pair, the spring that this moment, tension force detected bar 161 is adjusted button should be adjusted to lax state (but not contacting with ground wire contact 167) shown in Figure 1A, so that all yarns be able to respectively this detect bar with deviation in the bullet of the lax shape of the mode of sending yarn direction one side accommodate do not take place to extend and have be admitted under the condition of tension force carry out in the knitting machine knitting, because is to be in to be with in the pine tightly by the tension state of managing directly but not extending from yarn feeding wheel to the yarn 20A between the knitting machine, then all yarns are to the friction force minimum of abrasivity parts such as knitting needle, rate of wear also decreases, and the yarn section of the knitting needle of knitting machine institute crocheted is the longest naturally, and after the adjustment via above-mentioned water caltrop, it is all identical to make all tension force detect the amplitude of oscillation of bar, the identical homogeneous again of yarn section of all knitting needle institute crocheteds then, make the thick texture of cloth cover remarkable especially, feel is excellent.

Should illustrate around here, general simple and easy yarn feeding wheel is because tool storage yarn function not itself, comparatively inapplicable for quick woven knitwear, in the present invention, in order to remedy this defective, yarn is entered yarn feeding wheel 30 preceding multisection type winding raods in advance directly to be disposed, be reserved in yarn tube and the yarn feeding wheel process (promptly from guide eye 12A will store up yarn yarn section, 12B epimere boundary member 14 to the hook 15 between) the space in, the length of its storage yarn is far longer than the length of general yarn storage wheel, and in yarn-feeding process, be provided with epimere boundary member 14 and stage casing boundary member 16, because it is very approaching to detect the contact 161A and the ground wire contact 167 of bar 161, in case so that the moment that yarn tension disappears stopped immediately, make the broken hole of cloth cover both little few again, this improvement to the knitwear quality also has good meaning.

The second embodiment of the present invention, shown in Fig. 2 and Fig. 2 A, be to use the epimere boundary member instead stage casing boundary member 16A, and between yarn tube 11 and stage casing boundary member 16A, change and establish a presser device 50 (presser device can optionally increase and decrease), and enter yarn feeding wheel through a hitcher 15 again, remaining yarn-feeding process all is same as first embodiment, the practice of present embodiment is the presser device 50 that the tension reason straight yarn length of the yarn before the yarn feeding wheel yarn is extended to yarn tube 11 the place aheads by yarn feeding wheel toward the upstream path of sending yarn, this effect is compared with aforementioned first embodiment, go even farther in fact, therefore, yarn is strained the method disposed and whether is concerned most close to the quality of knitwear quality before yarn.

The third embodiment of the present invention, as shown in Figure 3, its principal character is all identical substantially with previous embodiment, institute's difference is to use simple and easy yarn feeding wheel instead storage yarn feeding device 30A, and the gravity type tension force of commonly using that will attach troops to a unit on storage yarn feeding device 30A detects device and uses instead and have the tension force that can adjust flexible adjustment button 162 and spring 163 and detect bar 161B, and the contact 161A that detects bar is also very approaching with ground wire contact 167, so that detect bar 161B yarn tension disappearance action effect is reached the sensitiveest degree, normally sending the contact 161A that detects bar 161B under the yarn state earth-free again.By among the figure as can be known, the presser device 50A of present embodiment and tension force detect bar 161B all concentrate be located at that yarn storage wheel 30A goes up and yarn that the previous embodiment branch is located at yarn feeding wheel send the yarn path on, the position in downstream is slightly different, but its effect and purpose there is no difference, going out yarn tension in the present embodiment, to detect bar 161B also be lax shape bullet pendulum yarn with as shown in the figure, even yarn is to enter in the knitting machine under non-rectilinear formula (V-type mode) tension state that is not extended, in like manner, also see through the adjustment of the water caltrop high and low position that all yarns attach troops to a unit, all yarns all are in carry out knitting with tight tension state in the identical pine that detects bar amplitude of oscillation institute bullet pendulum.To belt pulley 35, guide arm 34, the yarn filter 36 of yarn storage wheel, go into yarn and detect bar 37 and yarn storage wheel 38 etc. and all be same as known structure and function, relevant explanation is omitted.

By last explanation as can be known, new yarn feeder of the present invention consists essentially of a yarn tube 11; One presser device 50 or

guide eye

12A, 12B; Epimere boundary member 14 or stage casing boundary member 16A; Yarn feeding wheel 30 or yarn storage wheel 30A; Having the flexible tension force of adjustable through one again detects bar 161 and enters in the knitting machine, wherein, as adopt simple and easy yarn storage wheel, then with at least more than a circle, think that the tension before the yarn feeding wheel yarn manages one of straight means, simultaneously rubber-like being gone out yarn tension detects bar 161 and is adjusted to the most lax elasticity and moves under the sensitiveest active state, the lax formula amplitude of oscillation that the water caltrop means make all detect bar is all identical down by adjusting, the bullet pendulum respectively should under yarn enter in the knitting machine and reach the purpose that aforesaid homogeneous send yarn.

In sum, main intention spirit of the present invention is the yarn feeding method of yarn is divided into two-part (first section is before yarn feeding wheel send yarn, and second section is between the knitting machine after yarn feeding wheel send yarn), and first section is often to keep sending yarn under the tensile state; Second section is that yarn is in and is not extended but is sent yarn under the straight moderate tension state of reason, and make all yarns enter the water caltrop on the mat knitting machine before the knitting machine to be adjusted under the tension state that all yarns all have identical degree of tightness in advance, weave operation again, so the proportion of goods damageds of the consume portion product of knitting grade significantly reduce, production cost reduces, can reach each section yarn circle length that each knitting needle hooks up again reaches to greatest extent, and yarn circle size homogeneous, make body have thick texture, elasticity is good, the high-quality knitwear that shrinkage factor is low again, real is the sport quantum jump of conventional hosiery trade on weaving technology, has much value on the industry.

Claims

1. yarn feeding method is characterized in that:

Secondly (2) will cause all yarns between knitting machine from yarn feeding wheel is in and is not extended and by the tension state of reason straight (band is tight in the pine), when making all yarns detect bar again, be to put for this tension force respectively detects bar institute bullet in a side mode with deviation through rubber-like tension force;

So the yarn segment length of all knitting needle institute crocheteds is all identical, formed all yarn circle size homogeneous are to reach the purpose of weaving of cloth cover homogeneous.

2. yarn feeding method is characterized in that:

(1) all yarns is given tension earlier in the yarn tube causes the process of yarn feeding wheel, make it to be sent yarn having under the tension state that tension do not extend;

3. a kind of yarn feeding method according to claim 1 and 2 is characterized in that: enter in the knitting machine under yarn feeding wheel to the yarn between knitting machine is guiding state in the tortuous mode of multistage straight line and weave.

4. a kind of yarn feeding method according to claim 1, it is characterized in that: the yarn of this method before via the yarn feeding wheel yarn be many around at least one enclose behind yarn feeding wheel, to give again send, often be in the tension state that is tightened up and does not extend with the yarn before the yarn of guaranteeing yarn feeding wheel.

5. a kind of yarn feeding method according to claim 1 and 2 is characterized in that: the yarn of this method also disposes in the tortuous mode of multistage before entering yarn feeding wheel, uses the storage yarn length that increases before yarn enters yarn feeding wheel.

6. yarn-feeding device, comprise a yarn feeding wheel and attach troops to a unit one go out yarn tension detect boundary member and from yarn tube guiding yarn to the guide eye between yarn feeding wheel, boundary member, devices such as hook, it is characterized in that: the sending the yarn circumferential surface to have can be how to give again around a circle or the above yarn of a circle of this yarn feeding wheel send the relevant guide eye of yarn to dispose, the stop rod of this yarn boundary member then has the spring that can adjust its amplitude of oscillation size, the big I of the amplitude of oscillation that makes this go out the yarn tension stop rod cooperates water caltrop to be adjusted, these all yarns are tension in advance before yarn feeding wheel send the yarn yarn, make it often to be under the tension state that is tightened up, these all go out yarn tension to detect bar then be that respectively this detects the yarn that bar is controlled for mode bullet pendulum bullet pendulum with deviation one side, make the yarn segment length of each knitting needle institute crocheted that all yarns attach troops to a unit all identical, formed yarn circle size homogeneous is to reach the purpose of weaving of cloth cover homogeneous.

7. yarn-feeding device, comprise a yarn storage wheel, the yarn that yarn storage wheel set and go into the knitting boundary member of yarn tension, presser device and from yarn tube guiding yarn to the relevant thread-guide element between the machine of detecting, it is characterized in that: the tension force of the boundary member of this yarn storage wheel yarn one side detects that bar has can be as a means of the spring of adjusting its amplitude of oscillation size, make this amplitude of oscillation that goes out the yarn tension stop rod can cooperate water caltrop adjusted, this device can be with the tension in advance before yarn storage wheel send the yarn yarn of all yarns, all yarn yarns often are under the tensile state, inferior will from yarn storage wheel cause all yarns between knitting machine be in managed in the pine that directly and not is extended with tight moderate tension state under, make again these all yarns through above-mentioned respectively be putting for this tension force respectively detects bar institute bullet of making when this rubber-like tension force detects bar in deviation one side's mode, the mat means of adjusting water caltrop make that all yarns attach troops to a unit again detects bar and enters in the knitting machine under the condition of deviation one side's the identical amplitude of oscillation and weave, make the yarn segment length of each knitting needle institute crocheted that all yarns attach troops to a unit all identical, formed yarn circle size homogeneous is to reach the purpose of weaving of cloth cover homogeneous.

8. according to claim 6 or 7 described yarn-feeding devices, it is characterized in that: this goes out the contact that yarn tension detects bar, and in normal operation, the distance of itself and ground wire contact is very short, in case so that band does not tightly extend in the pine when going out yarn tension and disappearing, stop immediately.