EP1327015B1 - Supply device - Google Patents

Abstract

A feeding device for a mechanical weaving machine, including a winding element which can be driven in a rotating manner, a stationary storage, and at least one stop element. The stop element can be axially and radially moved in relation to the storage body, between an unwinding position releasing thread yarn and a stop position wherein the stop element is applied to the foremost winding and which ends the weft insertion. A yarn clamp is arranged downstream from the stop element, which initiates the respective weft insertion, and which can be switched between a passive position and a clamping position. The storage body has a small diameter, and the stop element is moved axially to the stop position solely by the windings due to a transport motion of the windings on the storage body.

Description

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

A delivery device of this type is known from DE 30 32 971 C and is there in alternation operated with at least one other similar delivery device. It is a matter of a measuring device that measures the length of the thread entered during a shot. For this purpose, four radially oriented, pin-shaped in the storage body Stop elements coupled to a planetary gear, that of the drive shaft of the Winding element is driven and each stop element by itself from a radially from the storage area distant position near the winding member in front of a straight in the Emerged winding of the thread coming from the winding element and then moved in the axial direction to the stop position in which the withdrawn thread is caught on the stop element. Then the stop element becomes again wegverstellt in the radial direction of the windings. The stop element acts as a conveying element for the windings on the storage body and terminates the respective Shot. Since the stopper is unable to initiate the shot is provided downstream of a controlled thread clamp, which clamps the thread while the stop element is moved away from the turns. The adjustment or Opening the thread clamp in the passive position initiates the shot. As each Stop element with the positive drive only moved relatively slowly and the positive drive builds large, the storage body needs undesirably large diameter (strong balloon formation), and even at least for a high firing frequency another similar delivery device needed. The mechanical load for the thread is high. The mechanical load and the large storage body diameter conditional strong balloon effect can at high yarn withdrawal speed frequent thread breaks or weft disturbances and entry delays cause.

A similar delivery device is known from EP 0 250 359 A. Each stop element is a Tooth of a gear, which in the derived from the drive shaft of the winding member Drive movement of the gear gradually between the turns on the Storage area is pushed and then moved forward with the windings, before he stopped in the stop position the shot. The needed for the initiation of the shot Thread clamp is provided on the storage body. The delivery device needed because of the slow forced movement of each stop element for higher firing speeds and because of the space of the drive a storage body with relatively large diameter, the undesirable strong balloon effect (mechanical load in the thread and time delay) conditioned.

The invention is based on the object, a delivery device of the type mentioned to create that for high shooting frequencies and high shooting speeds also suitable for sensitive thread material works largely trouble-free, and optimally short shot times possible.

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

The combination of a small diameter storage body and one exclusively axially movable into the stop position by the turns during their conveying movement Stoppelements makes it possible surprisingly, the yarn feeding device largely trouble-free even for high shooting frequencies and / or shooting speeds even to use with sensitive thread material. The small diameter Storage body reduces the balloon effect or cached in the thread balloon kinetic energy so that without excessive mechanical Loading the thread highest firing speeds and especially short Shot times are possible. However, due to the small diameter storage body a large number of turns for each shot and avoiding mechanical Impairment of Windungsbewegungen on the storage body by the stop element. This requirement meets the stop element when it is exclusive is moved axially by the windings in the stop position. The stop element does not need a drive for this movement, because it took away from the turns and the conveying motion of the turns, which in other ways during the winding process is generated with minimal or no mechanical resistance follows (stop element dragged by the windings). Because the movement the stop element in the stop position requires no control from outside or inside, the drive of the stop element only needs the precise engagement of the stop element between the turns control, and later to disengage the intervention again. In combination, these features result in a synergistic effect that increases high operational reliability even at high thread speed and / or too short firing times and / or high firing frequency leads. Under a small diameter Storage body is understood here as a storage body, the opposite to the conventional tendency for delivery devices with thread sizing function has a significantly smaller outer diameter. For delivery devices with thread measurement function Namely, a large storage body is also used to suit everyone Shot as few turns, and also an axially short thread stock, to have on the storage body.

With a high shot speed would a conventionally controlled thread clamp may not be able to cope with the shot precisely on the weaving machine cycle to initiate a coordinated vote. Therefore supports the thread clamp with her Quick-opening mechanism the positive effects of the small-diameter storage body and the stop element moved only by the turns in the stop position, by taking the shot at a precise and predetermined time extremely quickly, e.g. within just a few milliseconds or less.

Appropriately, only one results with the outer diameter of the storage body Memory surface circumference curvature, at least substantially with the natural Storage capacity of natural or synthetic or composite thread material for its smallest unforced curvature corresponds. Then the thread turns lie relatively powerless and well-ordered on the storage body, so that when Deduction of the so small outer diameter results in only a small balloon effect. With the thread's natural storage ability for its smallest unconstrained Curvature results in a certain thread curvature when a free thread section on a smooth surface bent to a very small loop and then is released. This loop then expands only to a residual curvature. This residual curvature is used as a guide for the outer diameter of the storage body used. Amazingly, it shows that the most different thread qualities and very different thread materials with very few exceptions very similar develop involuntary residual curvatures, and therefore fine with the small ones Storage body to be processed.

With an outer diameter between about 25 to 55 mm, preferably even at only about 35 to 40 mm, the balloon effect is also at high shooting speed desirably low. (The centrifugal force in the thread is approximately the square of the radius of curvature proportional). The small diameter allows amazingly short Shot times with moderate energy use, because the thread willingly peel off leaves. Such a small storage body can also be used for delivery devices for projectile or Rapier looms, e.g. with one with the small storage body cooperating trigger brake. The stop element and. the thread clamp would be then possibly not necessary.

The outer diameter may be so small that the axial length of the storage surface is much larger than the outer diameter.

Conveniently, the stop element via a joint with an axially stationary Radialverstellantrieb connected, which precisely timed the stop element and accurate set to engage in front of the just arriving thread turn from the winding member. Thereafter, the joint or the bending area remains the stop element Degree of freedom, thanks to which he is essentially powerless by the conveyor movement bring the turns on the storage body with these up to the stop position leaves.

So that the stop element can be moved back axially to order for the next To be able to stand up the thread sizing function before the first arising turn, An Axialverstellantrieb is used, which the stop element in the release position resets in the joint or bending area. Alternatively, several could be consecutive working stop elements are used.

In the stop position, the stop element should be caught at an axial stop become. This stop can be in the storage body or radially outside the Storage body be arranged.

Since when intercepting the thread in the stop position of the stop element from the momentary retardation of the thread mass the dreaded draft break occurs is it is particularly useful, the stopper in the stop position a stop damper attributed to mitigate the draft. This measure is reduced the danger of a thread break lasting. The stopper dampened through elastic yielding energy from the delayed thread into the stop element is initiated. For example, the stop moves against the stop element Spring force over a small stroke either in the axial direction, in an oblique Direction or in the circumferential direction of the storage body to consume this energy. It could even be the stop element elastically deformable in itself, the stop damping as soon as the thread stops abruptly and simultaneously the stop element is applied to the stop.

To precisely control the timing of the initiation of the shot through the thread clamp and to be able to predict, it is expedient, the thread clamp by a Actuating magnet to open while the active armature of the actuating magnet to allow against the clamping element of the thread clamp a Leerhub. When the actuating solenoid is energized, the valve uses the idle stroke without the mass of the clamping element and the opposite spring force to first accelerate and build up kinetic energy, and only after hitting the Idle stroke with high acceleration and / or high kinetic energy Shift clamping element abruptly in the passive position. That way an opening time of the order of only a few milliseconds or less achieve.

With regard to a clean thread control in the operating phase, in which the Stop element is brought from the stop position to the release position, it can be appropriate, the thread already clamped thread clamp approximately opposite to the withdrawal direction of the thread to the storage body to adjust. For an actuator is used, for example, a stepper motor, the thread clamp shifts or pivots. By the approach of the thread holding Thread clamp to the storage body is the thread section between the thread clamp and relaxed in the stop position arrested stop element, so that when adjusting the stop element from the stop position no significant Stretch tension more in this thread section is present, the otherwise to a sudden relaxation when adjusting the stop element and thus to a Disruption in the thread windings on the storage body could lead. After the stop element has been brought into the release position, and / or After the thread clamp has been switched to its passive position, the thread clamp reset again in the opposite direction.

Although the balloon effect on the small storage body is almost negligible, In the end phase of the shot, the thread can rotate in a movement space, in which he could get stuck on the thread clamp or its clamping area. Therefore, the thread clamp should then move out of the range of motion to let.

Fig. 1

eine Perspektivansicht von Hauptkomponenten eines erfindungsgemäßen Liefergeräts,

Fig. 2

eine schematische Seitenansicht eines fadenverarbeitenden Systems mit dem Fadenliefergerät der Fig. 1, und

Fig. 3

einen schematischen Längsschnitt eines Details.

Reference to the drawings, an embodiment of the subject invention will be explained. Show it:

Fig. 1

a perspective view of main components of a delivery device according to the invention,

Fig. 2

a schematic side view of a yarn processing system with the yarn feeding device of Fig. 1, and

Fig. 3

a schematic longitudinal section of a detail.

A delivery device F (FIGS. 1 and 2) with thread length dimensioning function for a weaving machine T has a stationary support 1, on which a storage body K is arranged, for example, similar to a rod cage with axially extending Rods 3, whose outer surfaces are approximately cylindrical or in Fig. 1 define right tapered storage area 4. The rods 3 are with foot parts. 5 attached to the carrier 1 so that they are radially adjusted in a certain area (Radialverstellvorrichtungen 6) to the outer diameter D of Memory body to adapt to the weaving width to vary. The outer diameter D of the storage body K defines a circumferential curvature of the storage area 4, which is essentially related to the natural storage capacity of natural, Synthetic or mixed thread material for its smallest unforced curvature corresponds. For example, the outer diameter D is only between about 25 and 55 mm. Preferably, the outer diameter D is only about 35 to 40 mm. The axial length of the storage surface 4 (L in Fig. 2) may be longer than the dimension the outer diameter D.

To the outer periphery of the carrier 1 rotates (arrow 2) a winding member W, for example a winding tube, which is connected to a hollow drive shaft, not shown is.

At the bottom of the carrier 1, three of the bars 3 are combined to form a bar 3 ', forming an axial stop 7 for a stop element S. The stop 7 may be an elastically yielding stop damper G (indicated by dashed lines) be assigned. The stop element 5 could also be at a different position than be arranged below.

In front of the free end of the memory body K and approximately axially aligned the position of the stop element S is a clamping region 8 of a thread clamp C. The thread clamp C preferably has a quick-opening mechanism 9, with a clamping element 13 against the force of a spring 12 in a passive position adjustable (to open), in which a held in the clamping area 8 thread Y is released. For example, a fitting A of an actuating magnet M in the direction of arrow 14 adjusted to the clamping member 13 from that shown in Fig. 1 Adjust clamping position to its passive position.

In addition, the thread clamp C by means of an actuator 10 in approximately parallel to Axis of the storage body or curved (double arrow 11, 11 ") back and forth, e.g. to be panned.

In the schematic sectional view in Fig. 2 it can be seen how the from the winding member W exiting Y in successive yarn turns YT the storage surface 4 of the storage body K is wound and an intermediate thread supply forms. From this thread supply the yarn Y is from an entry device E the weaving machine T deducted, for example, an air jet loom.

On the storage body K in Fig. 1 in the embodiment shown, the Thread turns by permanent winding by means of the winding member 2 in the direction to the front end of the storage body K conveyed forward (conveying movement B). In Fig. 2 is dashed as an alternative feeding device V indicated, for example is driven via the drive shaft of the winding member W, and the thread turns YT separated from each other and / or promotes the front end.

The stop element S is a pin 15, which has a joint or a bending region 16 is connected to an axially stationary Radialverstellantrieb 17, e.g. a magnetic drive. The Radialverstellantrieb 17 is capable of the joint 16 in the direction of Double arrow 18 back and forth, namely, the stop element S in engagement with the windings YT (as shown) to push or in a release position (not shown in the stop element S has no influence on the turns YT takes. In solid lines, the stop element S is shown as it just in the Way of the first arising turn YT intervenes. In the further rotation the winding member W permanent new turns are formed. The conveyor movement B moves the stop element S to the stop position (dashed line) at the stop 7. The pin 15 has a degree of freedom in the joint or bending region 16, thanks to which he follows the conveying movement B substantially powerless. At the end of the shot In the stop position of the stop element S, the thread Y is against further withdrawal abruptly blocked. During the shot, the thread clamp C is in its passive position. The stop 7 could also be outside the storage body K be positioned, as indicated for example at 7 '.

After firing the thread clamp C is in the in Fig. 2 in solid lines shown position brought into its clamping position in which it holds the thread.

Then, the stop element S from Radialverstellantrieb 17 out of engagement with the Windings adjusted in the release position.

An axial drive 19, e.g. an electromagnet displaces the one that has reached the release position Stop element S back to the position in which it (drawn drawn) again before the first resulting turn is engageable. Once in dependence From the weaving machine cycle to start a shot, the thread clamp C is in the Adjusted passive position. Thanks to the further rotation of the winding member W is the stop element is again brought from the turns YT to the stop position, in which then finishes the shot.

Since stopped in the stop position stop element S after firing and after Adjust the thread clamp C in its clamping position of the thread section between the thread clamp C and the stopper S is kept stretched (the entry device E usually exerts a fundamental pulling force on the thread), could it then when adjusting the Stoppelements in the release position for sudden relax this thread section come what the turns on could mess up the storage body (looping or confusion). For this reason, when stopper located in the stop position S and in the clamping position Asked thread clamp C the thread clamp C through the Actuator 10 in the position 11 'in Fig. 2 adjusted to this stretched thread section to relax. Once then the stop element S brought into the release position was, or even after the thread clamp C in its passive position has been changed, the thread clamp C from the actuator 10 back into the Retracted starting position.

The thread clamp C can be, for example, from the range of movement of the thread 4 remove (pivot position Q in Fig. 1). This can be a separate actuator Serve (not shown), or the actuator 10. Alternatively, a cover over the clamping area 8 are brought, or at least one deflector to the thread clamp be provided to exclude a hanging of the thread.

The thread clamp C in FIG. 3 has, analogously to FIG. 1, a tubular housing 20, in which the spring 12, the clamping element 13 in the clamping area 8 against a Clamping surface 21 presses (clamping position). The quick-opening mechanism 9 contains the electromagnet M, which when energized a valve A in the direction of the arrow 14 adjusted to act on the clamping element 13 against the spring 12 and out Adjust the clamping position shown in the passive position and release the thread. Between the armature A and the clamping element 13 is in the clamping position and a non-energized solenoid M, a Leerhub 23 is provided, the Armature A is used when the electromagnet M is energized to accelerate as quickly as possible and build up kinetic energy and only after hitting the idle stroke 23 with high force and the clamping member 13 to move as quickly as possible. On This way, an opening time for the thread clamp C of the order of magnitude of a few milliseconds or even shorter.

In still energized electromagnet M holds the valve A, the clamping element thirteenth in the passive position, until the stop element has reached the stop position Shot finished. Then, the solenoid M is de-energized and returns the clamping member 13 back by the spring 12 in the clamping position. The valve A is through a separate, e.g. very weak, return spring 22 returned to the starting position, in which the idle stroke 23 is set.

Claims (12)

1. Feeding device (F) having a yarn length measuring function for a weaving machine (T), comprising
   a winding element (W) driven for rotation;
   a stationary storage body (K) defining a storage surface (4) for intermediately storing a yam supply consisting of windings (YT) conveyed on the storage body with a conveying motion (B) in withdrawal direction, the yam (Y) being intermittently withdrawn from the yarn supply,
   at least one pin-shaped stop element (S) which is movable in relation to the storage body (K) substantially axially and radially between a release position for releasing the yam (Y) and a stop position in which the stop element (S) engages at the yarn (Y) and terminates a respective pick, and a yam clamp (C) provided downstream of the stop element (S) for starting the respective pick, characterised by the combination of the following features:

   a) a small diameter storage body (K), and

   b) a stop element (S) which is moved axially into the stop position exclusively by the conveying motion (B) of the windings (YT).
2. Feeding device as in claim 1, characterised in that the yam clamp (C) is adjustable between a passive position and a clamping position, and that the yarn clamp (C) comprises a quick opening mechanism (9).
3. Feeding device as in claim 1, characterised in that the outer diameter (D) of the storage body (K) defines the storage surface (4) with a circumferential curvature corresponding at least substantially to the capability of natural or synthetic yarn material to store its smallest unforced curvature.
4. Feeding device as in claim 1, characterised in that the outer diameter (D) of the storage body (K) amounts between about 25 mm and 55 mm, preferably is about 35 mm to 40 mm, respectively.
5. Feeding device as in claim 1, characterised in that the axial length (L) of the storage surface (4) up to the position at which the stop element (S) in its stop position co-operates in yarn blocking manner with the storage surface (4) is larger than the outer diameter (D) of the storage body (K).
6. Feeding device as in claim 1, characterised in that the stop element (S) is connected via a hinge or a bending section (16) to an axially stationary radial adjusting drive (17), and that the stop element (S) has a degree of freedom in the hinge or the bending section (16) for carrying out an axial movement relative to the radial adjusting drive (17) exclusively by the conveying motion (B) of the windings (YT) in the yarn supply wound on behind the stop element (S).
7. Feeding device as in claim 1, characterised in that the stop element (S) in the release position is substantially axially movable opposite to the conveying motion (B) of the windings (YT) by an axial adjusting drive (19), preferably in the hinge or the bending section (16), respectively.
8. Feeding device as in claim 5, characterised in that the stop element (S) in its stop position is caught at an axial stop (7, 7'), provided either in the storage body (K) or radially outside of the storage body (K).
9. Feeding device as in claim 6, characterised in that an energy dissipating impact damper (G) is provided at the stop position, preferably in the storage body (K), for the stop element (S).
10. Feeding device as in claim 2, characterised in that an actuating solenoid (M) is provided in the quick opening mechanism (9) of the yarn clamp (C), that the yam clamp (C) is maintained by spring force (12) in the clamping position, that a clamping element (13) is movable counter to spring force (12) into the passive position of the yarn clamp (C) by an armature (A) of the actuating solenoid (M), and that for the deenergising actuating solenoid (M) an armature acceleration idle stroke (23) is defined between the armature (A) and the clamping element (13).
11. Feeding device as in claim 2, characterised in that the yarn clamp (C) is adjustable back and forth at least substantially parallel to the withdrawal direction of the yarn (Y) from the storage body (K) and in relation to the storage body (K), preferably by means of a pivoting drive or a linear displacement drive (10), the displacement travel strokes (11) of which are matched with the movement at least of the stop element (S) such that the yarn clamp (C) in the clamping position is adjusted in the direction towards the storage body (K) when the stop element (S) has reached the stop position, and is adjusted in the passive position again in the opposite direction.
12. Feeding device as in claim 2, characterised in that the yam clamp (C) temporarily is removed out of the yam moving range, preferably by means of a displacement drive (10).

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