EP1560965B1 - Yarn distributor - Google Patents

Description

The invention relates to a delivery device specified in the preamble of claim 1 Art.

At the WO02 / 33156 A known delivery device of this type is the second thread control device arranged in the withdrawal direction of the thread longitudinal sections downstream of the storage body in the thread path, controlled thread clamp. 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 between the storage body and the thread clamp flying thread section.

At the EP 0 098 254 A known delivery device are associated with the storage body two pin-shaped stop elements, which are alternately moved axially and radially to initiate the respective deduction or to finish and to measure each longitudinal section. In one of two different working phases, one stop member transfers yarn turns representing a lengthwise portion to the other stopper, but the free yarn end of the stopped yarn in the main nozzle of the loom's feeding device makes a trailing motion. As a rule, at least two threads are entered alternately, and the free end of a thread when entering the other thread remains in the entry device, then too far projecting free end of the thread can collide with the registered thread or be damaged by this. In one embodiment, both stop elements operate outside of the storage body. Of the Switching between working phases with and without winding transfer inevitably entails undesirable thread control non-uniformities.

At the US 4 132 370 known delivery device four pin-shaped stop elements are arranged on a rotatable inside the storage body disc, which are axially and radially adjusted with a continuous rotational movement of the disc. Since the respective active stop element with an axial movement component in the withdrawal direction is moved further after it terminates the trigger, the free end of the thread in the loom moves further out of the entry device (entry nozzle) so that it can collide with a just entered other thread.

Also in the delivery device according to U.S. 4,498,639 moves the tooth-shaped stopper after completion of the trigger in the drawing direction, so that the free end of the thread in the entry device performs an undesirable trailing movement.

At the DE 30 32 971 A known delivery device, a controlled thread clamp is additionally provided downstream of the storage body, which initiates each deduction, and prevents trailing after completion of the deduction of the thread.

Even with the off EP 0 250 359 A known delivery device for the same reason in addition to a plurality of tooth-shaped stopper provided a controlled thread clamp to initiate each trigger, and previously hold the thread while the active stop element moves on.

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

The invention has for its object to provide a delivery device of the type mentioned, which allows despite the small diameter storage body for short flight times and high entry frequencies an optimal and uniform thread control without trailing movements.

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

The at least two stop elements alternately control the initiation and termination of the respective trigger in at least substantially the same mechanical manner and also in substantially the same axial positions of the storage body, thus resulting in an optimal and uniform thread control or thread geometry. Further, since the stop members, one of which initiates the trigger and the other ends the same trigger perform these functions substantially in the same, perpendicular to the axis of the storage body level, no trailing movement of the thread occurs after completion of the trigger. The free thread end of the stopped thread maintains its position in the insertion device, e.g. the entry nozzle of the air jet loom, until the next entry is correct. A collision of the free thread end with another, just entered thread can be avoided. The yarn longitudinal section is measured very precisely and for each entry the same, so that the weft losses can be kept low because the supernatant of the weft yarn on the entry side opposite fabric side edge can be set optimally short. A thread clamp downstream of the storage body is not required, so that difficulties with the thread section between the storage body and such a thread clamp are excluded from the outset.

Suitably, each stop element is moved from the thread sizing position in the engaged position by the turns on the storage surface in the stop position. In this way, a disturbing influence of the stop element on the thread movement along the storage surface is avoided, which is the uniformity of the thread control even at high winding speeds benefit. Furthermore, the motion control of the stop element can be made simple, because it only has the task, the stop element in the stop position for initiating the trigger to pull in the release position, and to push the stop element from the release position back into the thread sizing. The return of the stop element in the release position to the point of the thread sizing position can be done independently of the thread movement or the thread take-off, and is therefore less time-critical. For this task a simple drive, eg only one spring, can be used.

Alternatively, it is conceivable to forcibly move each stop member so that it performs a cyclic orbital motion.

The diameter of the storage body is suitably between only about 25 to about 60 mm, preferably even only between about 30 and 45 mm, and is variable to allow adjustment of the length of each longitudinal section. From this smallness of the storage body results in a desirable weak balloon effect in the withdrawn yarn, even at high yarn speed.

The stop patches of the stop elements may be defined by stops located either in the storage body or outside the storage body, for example in the movement controls of the stop elements themselves. The attacks are appropriate adjustable.

In order to achieve uniform take-off ratios, with only two stop elements, the stop elements should be offset from each other by about 180 ° about the axis of the storage body.

In one alternative, more than just two stop elements are provided. Then all provided stop elements are arranged distributed at least approximately regularly around the axis.

In a simple embodiment, the stop element has a first part connected to the drive means and a thread control part in the form of a pin, which is connected to the first part via a resilient joint. The resilient joint serves as a drive means for returning the yarn control part in the release position from the place of the stopplage to the location of the thread trimming position. The resilient joint is preferably biased elastically mainly in the direction of the thread sizing position. As a drive device for the movement of the stop element between the release position and the engaged position is expediently used against a spring force actuated armature or a magnet armature, which is bidirectionally operable. In the case of a movement control, which performs a forced movement of the stop member, a bidirectionally actuated magnet or a spring-actuated armature can also be used for the reciprocation between the locations of the stop pest and the thread trimming position.

Fig. 1

eine schematische Perspektivansicht eines Teils eines Liefergeräts,

Fig. 2 bis 7

einzelne Arbeitsphasen im Betrieb des Liefergeräts der Fig. 1, und

Fig. 8

einen schematischen Schnitt einer Bewegungssteuerung eines Stoppelements.

An embodiment of the invention will be explained with reference to the drawings. Show it:

Fig. 1

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

Fig. 2 to 7

individual work phases in the operation of the delivery device of Fig. 1 , and

Fig. 8

a schematic section of a movement control of a 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 is similar to a rod cage with axially extending rods 3, the outer surfaces of an approximately cylindrical, preferably in Fig. 1 define right tapered storage surface 4. 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 of the storage body K to adapt to the weaving width. The outer diameter d ( Fig. 2 ) of the storage body K is only about between 25 and 60 mm, preferably about 30 to 45 mm. The axial length of the storage surface 4 is greater than the dimension of the outer diameter d.

Around the outer periphery of the carrier 1 rotates (arrow 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 are at two diametrically opposite areas (offset about 180 ° about the axis X of the storage body K) associated with a first and a second, respectively pin-shaped stop element S1, S2, which in in Fig. 1 not shown, off Fig. 8 removable, stationary motion controls 15 are arranged. The stop elements S1, S2 are moved alternately and as indicated by the curves A, B, for example, depending on the rotational movement of the Wickelementes W. The curves A, B are mirror-symmetrical with respect to the axis X and substantially identical and run substantially in planes which are oriented radially to the axis X.

An in Fig. 1 not shown thread ( Fig. 2 to 7 indicated by Y) extends from the winding element W to the storage surface 4 and is wound on this in adjacent windings, which in Fig. 1 in the axial direction move parallel to each other forward and form a thread supply, which is cached on the winding body K. For this thread supply, the loom, not shown, eg an air jet loom with a main nozzle, pulls off a longitudinal section of the thread for each entry, the first and second stop elements S1, S2 dimensioning in cooperation the respective section determined for the withdrawal and initiating the respective withdrawal or break up. 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 A. For this purpose, the stop element S1 is initially moved by its movement control radially with respect to the axis X between an engagement position and a release position, wherein the engagement position along the curve part 12 is present, in which the tip of the stop element S1 in the path of movement of the thread windings on the storage surface 4 or even enters the storage surface 4 (between the webs 3). Along the curve part 9 is the stop element with his Tip in the release position, in which the tip is outside the path of movement of the thread turns on the storage surface 4 and also outside the storage surface 4. In addition, the stopper member S1 is also moved in the axial direction, along the cam member 9 by drive of the drive controller, but along the cam member 12 by the coils themselves. (In an embodiment not shown, however, the motion control of the stopper member S1 may also include a drive controlling the movement of the stopper member S1 along the cam member 12). Suitably moves in the engaged position of each stop member 51, 52 whose tip in an axial groove or an axial slot of a rod 3, to prevent slippage of turns.

In the engaged position of the stop element S1, this is moved between a thread sizing layer 11 and a stop ply 7 in the arrow direction, as I said, either by the turns themselves, or by a drive, not shown. In the release position, the stop element S1 is moved along the cam part 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 device of the movement 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 sequence of movements for the second stop element S2 (curve B) is analogous, i. it runs along the curve parts 9 '(release position of the second stop element S2) in the arrow direction and along the curve part 12' (engagement position) in the arrow direction, and from the stop ply 7 'to the location 8' or from the location 10 'into the thread trimming position 11'. The two stop elements S1, S2 are alternately moved, so that they alternately perform a thread sizing function, and initiate the trigger or end the trigger.

In an alternative, not shown embodiment, more than two stop elements S1, S2, for example, three, four or six could be distributed regularly around the circumference of the storage body K, which are also brought to act alternately.

Individual working phases of the delivery device of Fig. 1 be based on the Fig. 2 to 7 explained. Fig. 2 illustrates a working phase in which the first stop element S1 has arrived in its engaged position in the Stoppiage 7 at a stationary stop 13 and has previously completed the withdrawal of a thread longitudinal section. The yarn Y, which extends over the front end of the storage body K to an entry device, not shown, for example, the main nozzle of an air jet loom is stopped and remains motionless. On the storage surface 4 a plurality of adjacent turns of thread is formed, by the substantially continuous rotational movement (arrow 2) of the winding element W, wherein the second stop element S2 is also in its engaged position and in the movement along the Kurungseils 12 ', so that between the first stop element and the second stop element S2 present a predetermined number of turns which represent a longitudinal section of the thread prepared for withdrawal. Also upstream of the second stop element S2 are already more thread turns before.

Now, for example, in the loom, a trigger signal is output to which the motion control of the first stop element S1 responds so that the first stop element S1 is retracted at the stop 13 from the stop puddle 7 to the location 8 of the curve A. Meanwhile, the second stop element S2 continues to move along the curve part 12 'by newly added thread turns. As the arrow 14 indicates, the measured thread longitudinal section is now removed. In this case, the second stop element S2 continues to move along the curve part 12 ', so that when practically all the turns present downstream of the second stop element S2 have been withdrawn, it is already in the vicinity or at a stop 13', which closes the stop ply 7 'of FIG second stop element S2 defined. The stops 13, 13 'define the stop patches 7, 7' at least substantially in the same plane E perpendicular to the axis X, i. at substantially the same axial positions of the storage surface 4.

As soon as the first stop element S1 approaches the location 8 when it is withdrawn from the stop pest, it is already moved by the drive control along the cam part 9 in the direction of the location 10.

In Fig. 4 the second stop element S2 has ended the trigger in its stop position 7 '. The yarn Y is downstream of the second stop element S2. Upstream of the second stop element S2 new turns are still wound up. The first stop element S1 moves along the curve part 9 and is already close to the location 10. As soon as a predetermined number of turns has been wound onto the storage surface 4, the first stop element S1 is pushed from the place 10 into the thread trimming layer 11 and into the engaged position (FIG. Fig. 5 ) and that behind the last intended for the next deduction Fadenwindung and before the next to be formed for a further deduction Fadenwindung. By winding up the turns of thread, the first stop element S1 is immediately moved along the curve part 12 again. The second stop element S2 is still in its stop position 7 'on the stop 13', so that between the stop elements S1, S2, the required number of turns is present. Y thread still stands.

In Fig. 6 For example, the next trigger signal has been delivered by the weaving machine, so that the second stop element S2 is pulled out of the stop position to the location 8 'and thus into its release position. As a result, the next trigger is initiated and the downstream of the first stop element S1, which moves along the curve part 12, available turns for trigger and (arrow 14) deducted. In this case, the first stop element S1 moves along the curve part 12 further in the direction of the stop pest 7, which it partly by the wound yarn turns and partly by the train in the yarn Y in Fig. 7 reached and finished the deduction. After completion of this deduction, the second stop element S2 has been pushed back into its thread sizing position 11 'and moves the second stop element S2 along the curve part 12' already under the forces of the subsequently wound thread turns towards its stop position 7 '. This is again the work phase accordingly Fig. 2 reached.

In summary, this means that in each case one stop element initiates withdrawal by withdrawing from its stop position, while the other stop element performing the thread sizing function is brought into its stop position by the turns of thread and the pull during withdrawal and terminates the withdrawal.

The thread control device 15 (FIG. Fig. 8 ) can be the same for both stop elements S1, S2. 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 presses the magnet armature 19 from the iron core 18. The stop element S1 (S2) 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, such as polyurethane, and generates a bias that acts on the thread control part 22 to an example indicated stop 24, which defines the thread trimming position 11 and 11 'shown. At stop 24, a weak permanent magnet could temporarily hold the thread control member 22. In the housing 16, the stop 13 or 13 'is further provided in the opposite direction, which can be adjustable to define the stop pest 7. In Fig. 8 the stop element S1 or S2 is shown in its engaged position, which is adjusted by the spring 20. When the coil is energized, the armature 19 is pulled toward the iron core 18 and the spring 20 is compressed so that the stop member S1 is pulled to its release position, not shown.

Instead of acting in one direction against spring force magnet, a bidirectionally actuated magnet or an arrangement of two opposing magnets could be used to control the movement of the stop element S1 and S2 between the engagement and release positions. For the mentioned case of a forced movement of the stop element S1 or S2 also between the thread sizing position and the stop ply, a movement drive (not shown) which works similarly to the above could be provided, which controls the axial movements of the thread control part 22.

Claims (8)

1. Yarn feeding device (F) having a yarn measuring function, for a weaving machine, comprising a rotatably driven winding organ (W), a stationary small diameter storage body (K) defining a storage surface (4) for intermediately storing a yarn supply consisting of yarn windings being conveyed forward on the storage surface in the direction of the axis (X) of the storage body, from which yarn supply measured yarn sections are withdrawn intermittently over the front end of the storage body, a first pin-shaped stop element (S1) provided in a movement control (15) stationarily arranged outside the storage body (K) which first stop element (S1) is regularly movable relative to the storage surface and substantially radially to the axis between a withdrawal position (8, 10) outside the storage surface (4) for releasing the yarn (Y) and an engagement position engaging into the yarn path and the storage surface (4) in which engagement position the first stop element (S1) is axially movable from a position (11) for measuring the yarn section into a stop position (7) terminating the yarn section withdrawal and stopping the yarn (Y), and at least one second yarn control device arranged outside of the storage body (7) for selectively releasing or stopping the withdrawn measured yarn section characterised by the following features:

   the at least one second yarn control device is a second pin-shaped stop element (S2) arranged in a second movement control (15) stationarily provided outside of the storage body (K), which second stop element (S2) is arranged offset in circumferential direction of the storage surface (4) with respect to the first stop element (S1) and which is movable regularly relative to the storage surface (4) and substantially radially to the axis (X) between a withdrawal position (8', 10') outside of the storage surface (4) for releasing the yarn and an engagement position engaging into the yarn path and into the storage surface (4) in which engagement position the second stop element (S2) is movable from a position (11') for measuring the yarn section axially into a stop position (7') terminating the yarn withdrawal,

   the first and second stop elements (S1, S2) in their respective engagement positions are alternatingly movable into the stop positions (7, 7') and back and forth between the release positions and the engagement position such that one stop element starts a withdrawal and the other stop element terminates the same withdrawal,

   an axial position is defined for each stop element (S1, S2) in the storage surface (4) as the yarn stop position (7, 7') and at the same time as a yarn release position, where the stop element starts or terminates the yarn section withdrawal at the stop position by a movement away from or into the engagement position, and

   the defined axial positions of the stop elements (S1, S2) are situated substantially in the same radial plane (E) of the storage body (K) which plane is perpendicular to the axis (X).
2. Yarn feeder as in claim 1, characterised in that the movement control (15) of the respective stop element (S1, S2) is provided with drive means for radially adjusting the respective stop element between the release position and the engagement position and for an axial adjustment only from the stop position (7, 7') back into the position (11, 11') for measuring the yarn section, and that the stop element (S1, S2) either is designed or is arranged in the movement control such that while being in the engagement position it is moved by the axially conveyed yarn windings on the storage surface (4) from the position (11, 11') for measuring the yarn into the stop position (7, 7').
3. Yarn feeder as in claim 1, characterised in that the movement control (15) of each stop element (S1, S2) is provided with drive means (17, 18, 19) for radially displacing the stop element between the release position and the engagement position and for axially adjusting the stop element back and forth between the position for measuring the yarn section and the stop position.
4. Yarn feeder as in claim 1, characterised in that the diameter (d) of the storage body amounts to between about 25 mm to 60 mm, preferably between about 30 mm to 45 mm, and that the diameter (d), preferably, is variable.
5. Yarn feeder as in claim 1, characterised in that the stop positions (7, 7') of the stop elements (S1, S2) are defined by stops (13, 13') situated either within or outside of the storage body (K).
6. Yarn feeder as in claim 1, characterised in that the first and second stop elements (S1, S2) are offset to each other about the axis (X) by about 180°
7. Yarn feeder as in claim 1, characterised in that more than only one second stop element (S2) is provided, and that all stop elements (S1, S2) are distributed substantially regularly around the axis (X).
8. Yarn feeder as in claim 2, characterised in that the stop element (S1, S2)has a first part (21) which is connected either to a magnet armature (19) which is actuable, preferably, counter to a spring force (20), or to a bi-directionally actuable magnet armature, and has a second yarn control part (22) which is connected to the first part (21) via a resilient joint (23), preferably via an elastomeric joint, the resilient joint (23) being resiliently pre-loaded in movement direction of the yarn control part (22) from the stop position (7, 7') to the position (11, 11') for measuring the yarn section.

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