EP1562847B1 - Supply device - Google Patents

Description

The invention relates to a delivery device according to the preamble of claim 1.

In the case of the delivery device of this type known from WO 02/33156 A, the second thread control device is a controlled thread clamp arranged downstream of the storage body in the take-off direction of the thread longitudinal sections. An important advantage of the known delivery device results from the small-diameter storage body, which allows extremely short entry times and extremely high entry frequencies due to an extremely reduced balloon effect during thread withdrawal, as they are, preferably, in modern air-jet looms indispensable to optimally use the performance of the loom can. The first stop element ends the trigger in its stop position. The thread clamp initiates the next thread take-off in the case of the first stop element which has already been adjusted again into the thread measuring position. Since the initiation and termination of the trigger are controlled not only at different points of the thread path, but also in mechanically different ways, can be difficult to control with sensitive thread material of the flying between the storage body and the thread clamp thread section.

In the case of the delivery device known from EP 0 098 254 A, the storage body is assigned two pin-shaped stop elements which are alternately moved axially and radially in order to initiate or terminate the respective withdrawal and to dimension the thread longitudinal sections. In one of two different working phases, with the yarn stopped, one stop member transfers turns representing a measured longitudinal section to the other stop element. In one embodiment, both stop elements operate outside of the storage body. The turn transfers necessarily mean nonuniformities in the course of the thread control, since no transfers take place in the other work phases.

In the case of the delivery device known from US Pat. No. 4,132,370, four pin-shaped stop elements are arranged on a disk rotatable inside the storage body, and these are forcibly moved axially and radially with a continuous rotational movement of the disk become. Accurate control when initiating and exiting the trigger is difficult due to sliding transitions, as well as correct tuning to the clocks. This also applies to the delivery device according to US 4 498 639 with tooth-shaped stop elements.

In the delivery device known from DE 30 32 971 A, a controlled thread clamp is additionally required downstream of the storage body, which initiates each withdrawal.

In the case of the delivery device known from EP 0 250 359 A, for this reason, in addition to a plurality of tooth-shaped stop elements, a controlled thread clamp is provided in order to initiate the respective withdrawal.

The delivery devices according to US 4 132 370, US 4 498 63, DE 30 32 971 A, EP 0 250 359 A require because of the mechanism for controlling the movement of the stop elements in the interior of the storage body, a large storage body with at least about 120 mm in diameter, which, however At high thread speed produces a pronounced balloon effect in the withdrawn thread. A strong balloon effect allows no flight times or entry frequencies that meet the performance of modern airjet looms.

The mechanical drive controls the stop elements in the known delivery devices are technically complex and prone to failure. The drive concepts would not be expedient for a small-diameter storage body, because the small-diameter storage body has to be operated at high winding speed, there is too little installation space for mechanical drives in the storage body, and impractically high drive powers would be required because of the power losses in the mechanical transmissions. The cam controls of the delivery device according to EP 0 098 254 for high winding speeds, as used in small-diameter storage bodies, due to large moving masses and unavoidable mechanical play inappropriate.

The invention has for its object to provide a delivery device of the type mentioned with a short flight times and high entry frequencies, small diameter Specify storage body that allows a uniform and therefore low-interference intermittent thread control, the structural complexity in the movement controls the stop elements should be low.

The stated object is achieved with the features of claim 1.

Since the second, pin-shaped stop element needs to be moved only substantially radially to the axis of the storage body to initiate a trigger, a structurally simple and fast motion control can be used for the second stop element. The movement control of the first stop element can also be designed simply because the first stop element does not initiate a trigger, but only to dimension the thread longitudinal section and to finish the trigger. Since the second stopper initiates each trigger at the same axial position of the storage surface, and the first stopper terminates the trigger near the second stopper, a uniform intermittent thread control results. A thread clamp downstream of the storage body can be omitted, which could have undesirable effects on the thread control. If turns when transferring to the second stop element perform any axial movement in the withdrawal direction, a possible trailing movement of the free end of the thread in the entry device of the loom remains negligibly small because of the small diameter storage body.

The two stop elements are arranged relative to one another such that the first stop element transfers turns to the second stop element without significant trailing movement in the yarn extending from the delivery device to the weaving machine. This is the case if the position of the second stop element is adjacent to the stop position of the first stop element, so that the foremost turn in the take-off direction is directly taken over by the second stop element when the first stop element is moved from its stop position to the release position and returns to the thread sizing position. Preferably, the second stop element is located at a position which lies in the axial direction of the storage body between the stop position of the first stop element and the front end of the storage body, and / or in the winding direction, ie in the circumferential direction of the storage body, behind or beside the Stopplage of the first stop element. Basically, it can be said that the second stop element is positioned as close to the stop position of the first stop element, as the structural possibilities allow.

The first stop element in the stop pest expediently adjoins the second stop element which is moved into the engagement position substantially directly. Optionally, even a direct contact arises, so that the second stop element forms a stop for the first stop element and defines the stop position of the first stop element. The first stop element can be concavely hollowed out on its side pointing in the withdrawal direction, in order then to be able to cling as closely as possible to the second stop element in the stop position.

The functions of the first and second stop elements are the same for each trigger. The second stop element stops after completion of a trigger thread, while the first stop element performs its thread sizing function and moves toward the stop position. To initiate a trigger, the second stop element is moved from its engagement position into the passive position only substantially radially, after, for example, a trigger signal has been issued by the loom. Due to the further winding of turns and / or by a forced movement and / or by the growing tensile force towards the end of the trigger, the first stop element enters the stop position in which it terminates the trigger while the second stop element remains in its passive position. At the end of the trigger or a bit trailing the second stop element is brought back into its engaged position and the first stop element from the stop pest in the release position and also immediately moved back towards the thread trimming position to perform the next thread trimming function. This process follows harmoniously.

In order to influence the turns of thread as little as possible, and to be able to use a simple drive control for the first stop element, the first stop element is moved in its engaged position from the thread sizing position to the stop position by the thread windings themselves. This movement is very rapid due to the high winding speed on the small diameter storage body.

Alternatively, however, a drive in the motion controller may control this movement of the first stop element from the suture level to the stop level, for example, to precisely define the time of the end of the siphon.

The storage body should only have a diameter between about 25 and about 60 mm, preferably between about 30 and 45 mm, the diameter, preferably, should be variable in order to make an adjustment to the weaving width can.

In order to optimally arrange the two stop elements relative to the storage body, only the ends of the two stop elements in the stop position of the first stop element and the engagement position of the second stop element should be as close to each other as possible and the stop elements at a distance from the ends of each other. This can be achieved by interlacing, angular pitching, trimming or similar measures, without affecting the thread control function of both stop elements.

Fig. 1

eine schematische Perspektivansicht eines Teils eines Liefergeräts,

Fig. 2 bis 6

verschiedene Arbeitsphasen des Liefergeräts in schematischem Längsschnittansichten,

Fig. 7

eine Schemadraufsicht,

Fig. 8

eine Seitenansicht, und

Fig. 9

einen Querschnitt einer Bewegungssteuerung mit einem ersten Stoppelement.

Embodiments of the subject invention will be explained with reference to the drawing. Show it:

Fig. 1

a schematic perspective view of a part of a delivery device,

Fig. 2 to 6

various working phases of the delivery device in schematic longitudinal sectional views,

Fig. 7

a schematic top view,

Fig. 8

a side view, and

Fig. 9

a cross section of a movement control with a first stop element.

A delivery device F (FIG. 1) with thread sizing function for a weaving machine (not shown) has a stationary support 1 on which a storage body K is arranged. The storage body K is similar, for example, to a rod cage with axially extending rods 3, the outer surfaces of which define an approximately cylindrical storage surface 4, which preferably tapers to the right in FIG. The rods 3 are mounted with foot parts 5 on the carrier 1 so that they can be radially adjusted in a certain area (Radialverstellvorrichtungen 6) to vary the outer diameter d of the storage body K to adapt to the weaving width. The outer diameter d of the storage body K is only about between 25 and 60 mm, preferably about 30 to 45 mm. The length of the storage surface 4 in the direction of the axis X of the storage body is greater than the dimension of the outer diameter d.

Around the outer circumference of the carrier 1 rotates (winding direction 2) a winding member W, for example, a Auslassöse carrying a winding tube which is connected to a hollow drive shaft, not shown.

The winding body K is associated with a first and a second, each pin-shaped stop element S1, S2. Each stop element S1, S2 is arranged in a stationary motion control, not shown in FIG. 1, wherein the two motion controls are optionally combined in a housing. The stop elements S1, S2 are cyclically moved as indicated by the curves A, B, e.g. depending on the rotational movement of the winding element W and / or the working cycles of the loom. The stop elements S1, S2 are moved in planes that are oriented substantially radially to the axis X.

A yarn (not shown in FIG. 1) (shown in FIG. 2 as Y) extends from the winding element W to the storage surface 4 and is wound thereon in side-by-side windings which move forward parallel to one another in the direction of the axis X and form a yarn supply. which is temporarily stored on the winding body K. For this thread supply, the weaving machine, not shown, eg an air jet loom with a main nozzle, pulls off a longitudinal section of the thread for each entry, the stop elements S1, S2 cooperating dimensioned for each deduction longitudinal section, the second stop element S2 initiates the trigger, and the first stop S1 terminates the trigger. Initiation of the trigger is triggered, for example, by a trigger signal transmitted by the loom.

The sequence of movement of the first stop element S1 is first explained with reference to the curve B. The stop element S1 is first moved by its movement control substantially radially to the axis X between an engaged position in the thread path and in the storage surface 4 and a release position outside the thread path and outside the storage surface 4, wherein the engagement position is held along the cam member 12, while the Release position along the curve part 9 is held. In addition, the first stopper member S1 is also moved in the axial direction by driving the drive controller along and in the arrow direction of the cam member 9, but in the arrow direction and along the cam member 12 by the coils themselves. In an embodiment not shown, the motion control of the first stop element S1 also contain a drive which forcibly controls the movement of the first stop element S1 along the cam part 12. Suitably, the tip of the first stop element S1 moves in the engaged position in an axial groove or an axial slot of a rod 3. Also, the second stop element S2 engages there. This is to avoid slipping of turns.

In the engaged position of the stop element S1, this is moved in the direction of the arrow between a thread trimming position 11 and a stop ply 7, either by the windings themselves or by a drive, not shown. In the release position, the stop member S1 is moved along the cam member 9 from a location 8 corresponding to the stop ply 7 to a location 10 corresponding to the thread trimming layer 11, by means of a drive of the motion control. From the stop position 7, the stop element S1 is pulled in the direction of the arrow to the location 8. From the location 10, the stop element S1 is pushed in the direction of the arrow into the thread trimming layer 11.

The movement sequence (curve A) of the second stop element S2 is different, because the second stop element S2 is moved back and forth essentially only radially to the axis X, specifically between an engagement position 7 ', in which it engages in the thread path and the storage surface 4 and a passive position 8 ', in which it is withdrawn from the storage surface 4 and the thread path.

In the embodiment shown in FIG. 1, the first and second stop elements S1, S2 are located substantially one behind the other in the direction of the axis X. However, the second stop element S2 could also be offset in the circumferential direction of the storage surface 4 with respect to the first stop element S1.

The movements of the two stop elements S1, S2 are coordinated with one another such that the first stop element is then moved from a stop ply 7 via the location 8 and along the curve part 9 and the location 10 into the thread trimming layer 11, while the second stop element S2 is in its engaged position 7 'occupies. The second stop element S2 is only moved into its passive position 8 'when the first stop element S1 is in its engaged position along the cam part 12. The thread trimming layer 11 of the first stop element S1 is defined such that the first stop element S1 engages exactly between the last turn intended for a trigger and the first turn just formed by the winding element W for the next take-off in the thread path.

The operation of the delivery device F of Fig. 1 will be explained with reference to FIGS. 2 to 6. In the working phase of FIG. 2, the second stop element S2 is in its engaged position 7 ', so that the yarn Y, which extends beyond the front end of the storage body K, is held. Upstream of the second Stoppelements S2 are already present thread turns. The first stop element S2 is in its engaged position along the curve part 12 and moves with the continuously wound turns in the direction of the second stop element S2. The thread section dimensioned for a trigger is defined by the turns present between the first and second stop elements S1, S2. Upstream of the first stop element S1 are already already windings on the storage surface 4 before.

In the working phase according to FIG. 2, a trigger signal is emitted by the weaving machine, because a withdrawal has to be initiated. The second stop element S2 is pulled from the engagement position 7 'of Fig. 2 in the passive position 8' of Fig. 3 from the thread path. Thus, the trigger is initiated and moves the thread (arrow 14) in the loom. The turns stored downstream of the first stop element S1 are unwound. In this case, the first stop element S1 continues to move along its curve part 12 and in the axial direction to the second stop element S2. Upstream of the first stop element S1 further turns are wound up.

After all windings have been unwound downstream of the first stop element S1 during the withdrawal, the first stop element S1 reaches its stop ply 7, for example on a stationary stop 13 (FIG. 4). The stop 13 may be provided in the storage body or outside the storage body or in the movement control of the first stop element S1. Alternatively, the stop 13 could be formed directly from the second stop element S2. In the working phase in FIG. 4, upstream of the first stop element S1 there are even fewer turns than are required for a trigger. As soon as the first stop element S1 has reached its stop ply 7, for example at the stop 13, the trigger is terminated.

With the end of the deduction or trailing to this, the second stop element S2 from its passive position 8 'again in its engaged position 7' (Fig. 5) adjusted. The first stop element S1 is moved from its stop position 7 radially outward to the location 8 from the thread path and the same further along the curve part 9 in the direction of the thread sizing position. In this case, the turns present upstream of the first stop element S1 are transferred to the second stop element S2. The first stop element S1 is moved back into the thread trimming layer 11 via the location 10 (FIG. 6), precisely behind the last loop required for the next take-off and before the first loop leaving the winding element W for the further trigger. With the winding up of further turns, the first stop element S1 moves along the curve part 12 until the working phase according to FIG. 2 is reached again.

FIG. 7 illustrates in a dashed region 25 of the storage surface 4 the possible positions of the second stop element S2, indicated by crosses, in relation to the position of the first stop element S1 in the stop ply 7. This region lies within a field defined by the yarn Y. A thread section 26, which extends from the foremost turns to the first stop element S1, is deflected at the latter and extends further in the axial direction, defines this field lying in the winding direction 2 behind the first stop element S1. The position of the second stop element S2 should be as close as possible to the position of the first stop element S1 in the stop ply 7, so that the thread windings can be reliably transferred. In this case, positions of the second stop element S2 are possible, in which this is located in the axial direction between the first stop element S1 and the front end of the storage body, or is offset in the winding direction 2 with respect to this in the circumferential direction to the rear.

FIG. 7 illustrates in dashed lines the movement path of the first stop element S1 between the location 10 and the thread sizing layer 11 and the stop ply 7.

8 schematically illustrates an embodiment in which the second stop element S2 is positioned in the withdrawal direction directly behind the first stop element S1 when the first stop element S1 has reached its stop ply 7. Conveniently, only the ends of the stop elements S1, S2 are as close to each other as possible, while their relative distance increases with increasing distance from the ends. For example, then the first stop element S1 is employed obliquely, while the second stop element S2 is formed with a thread control part 22 'bent.
The stop elements S1, S2 could also be mutually entangled, that is, be inclined in a view in the direction of the axis X deviating from a purely radial orientation on the axis X.

FIG. 9 schematically illustrates a stationary thread control device 15 for the first stop element S1. The thread control device 15 has a housing 16 in which a magnet winding 17 and an iron core 18 are contained. Further, an axially movable armature 19 is provided, wherein between the iron core 18 and the armature 19, a spring 20 is arranged, which is the armature 19 of the iron core 18 pushes away. The stop element S1 consists of a first pin-shaped part 21, which is connected to the armature 19, and a likewise pin-shaped thread control part 22 which is connected via a resilient joint 23 with the first part 21. The resilient joint 23 consists for example of an elastomer or of rubber, for example on polyurethane, and generates a bias that acts on the thread control member 22 to an example indicated stop 24 down, which defines the thread trimming position 11 shown for the first stop element S1. At stop 24, a weak permanent magnet could temporarily hold the thread control member 22. In the housing 16, the stop 13 is further provided in the opposite direction of movement, which can be adjustable to define the stop puddle 7 of the first stop element S1. In Fig. 9, the stop member S1 is held in its engaged position by the action of the spring 20, in the stop position. When the solenoid 17 is energized, the armature 19 is pulled by the iron core 18 and the spring 20 is compressed, so that the stopper S1 is pulled to its release position, not shown.

Instead of a magnet acting only in one direction against spring force, bidirectionally actuable magnet or an arrangement of two magnets working in opposite directions could also be used to move the first stop element S1 between its engagement and release positions. In the case of a positively controlled movement of the stop element S1 between the thread trimming layer 11 and the stop ply 7, a similar, axially operating drive (not shown) could be provided, which controls the axial movement of the thread control part 22, and optionally also executes the return movement into the thread trimming position. Then, a simple joint could be provided instead of the resilient joint 23.

The movement control of the second stop element S1 may be similar to the movement control 15 in FIG. 9, with the difference that no movement of the second stop element S2 in the axial direction of the storage body K is required. For example, the armature 10 could be connected directly to the pin-shaped second stop element S2 to reciprocate it substantially radially with respect to the axis X. The drive controls of both stop elements S1, S2 could be combined in a common housing.

The stop 13 could also include a damping to mitigate the voltage peak in the withdrawn thread when the first stop element S1 reaches its stop ply 7.

The movements of the first stop element S1 are expediently controlled as a function of the winding movement of the winding element W, while the movements of the second stop element S2 are controlled, for example, as a function of the weaving cycles.

Claims (8)

1. Feeder (F) having a yarn measuring function, for a weaving machine, comprising a rotatably driven winding organ (W), a stationary small diameter storage body (K) having a storage surface (4) for intermediately storing a yarn supply consisting of yarn windings which are conveyed on the storage surface (4) in the direction of the axis (X) of the storage body (K), from which yarn supply measured yarn length sections are withdrawn intermittently over the front end of the storage body (K), a first pin-shaped stop element (S1) provided in a movement control assembly (15) arranged stationarily outside the storage body, which first stop element (S1) is movable relative to the storage surface (4) and substantially radial to the axis between a preparation withdrawal position (A) outside of the storage surface for releasing the yarn and an engagement position engaging into the yarn path and into the storage surface (4), and which first stop element (S1) additionally is adjustable in its engagement position substantially axially between a position (11) for measuring the yarn and a stop position (7) for terminating the yarn withdrawal, and at least one second yarn control device arranged outside the storage body and having a movement control assembly by which yarn control device the yarn length section can be released depending on weaving cycles starting for the withdrawal, characterised in that the second yarn control device comprises a second pin-shaped stop element (S2) which exclusively is movable back and forth at least essentially radial to the axis (X) between a passive position (8') where the second stop element is pulled back from the storage surface (4), and an engagement position (7'), where the second stop element engages into the storage surface (4), and that the position of the second stop element (S2) in its engagement position is associated to the stop position (7) of the first stop element (S1) such that during a movement of a first stop element (S1) from the stop position (7) into the withdrawal preparation position (8) yarn windings present upstream of the first stop element (S1) are transferred from the first stop element (S1) to the second stop element (S2), before the first stop element (S1) is adjusted into the position (11) for measuring the yarn.
2. Feeder as in claim 1, characterised in that the position of the second stop element is closely adjacent to the stop position (7) of the first stop element (S1), preferably lies substantially in axial direction between the stop position (7) of the first stop element (S1) and the front end of the storage body (K) and/or in winding direction (2) behind the first stop element (S1) which has reached the stop position (7)..
3. Feeder as in claim 1, characterised in that the first stop element (S1) in its stop position (7) essentially directly is situated close to the second stop element (S2) which has been moved into the engagement position (7'), in some cases even is abutting at the second stop element (S2).
4. Feeder as in claim 1, characterised in that the movement control device of the first and second stop elements (S1, S2) are designed and adapted to each other such that each withdrawal is started by a movement of the second stop element (S2) from the engagement position (7') into the passive position (8') and is terminated by the first stop element (S1) when reaching the stop position (7), and that the first stop element (S1) is adjustable into the position (11) for measuring the yarn after the yarn winding transfer and before the second stop element (S2) is moved out of the engagement position (7').
5. Feeder as in claim 1, characterised in that the first stop element (S1), when having reached its engagement position, is moved by the forward conveyed yarn windings from the position (11) for measuring the yarn into the stop position (7).
6. Feeder as in claim 1, characterised in that the first stop element (S1), when having reached the engagement position, is moved from the position (11) for measuring the yarn into the stop position (7) in a forced fashion by a drive provided in the movement control assembly (15).
7. Feeder as in claim 1, characterised in that the storage body (K) has an outer diameter (d) between about 25 mm and about 60 mm, preferably between about 30 mm and about 45 mm, which outer diameter (d), preferably, is variable.
8. Feeder as in claim 1, characterised in that in the stop position (7) of the first stop element (S1) and in the engagement position (7') of the second stop element (S2) the active ends of the first and second stop elements (S1, S2) engaging into the storage surface (4) are positioned closer to each other than the stop elements are in a distance from the active end, preferably by a crossed arrangement, a cranked or an angled relative arrangement between both stop elements.

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