EP0719354B1 - Projectile or gripper shuttle loom and delivery unit - Google Patents

Abstract

In a projectile or gripper shuttle loom (L) comprising a weft-thread delivery device (S) with an overend-unwinding delivery unit (F) that has a stationary, brakeless drum (4), comprising also a take-down eyelet (E) arranged coaxially downstream of the drum (4) and a thread brake (B) controlled in accordance with the loom cycle, the thread path is enclosed by at least one hollow body (K) from the circumferential face of the drum (4) to the take-down eye (E) at least in one axially limited segment, said hollow body (K) having on its inner side coaxial to the drum axis a number of ballooning, perturbing and braking elements which protrude inwards without touching the drum while forming projections (V) and delivery surfaces for the weft thread.

Description

The invention relates to a projectile or rapier shooter weaving machine according to the preamble of claim 1 and a delivery device according to the preamble of the claim 16.

In one known from US-A-34 11 548 (Fig. 1 to 5) Projectile loom is the weft from the drum beneath the end of the drum, cylindrical ring body pulled into the trigger eye, behind which the controlled thread brake is arranged. Of the Ring body limits the size of the when pulling forming balloons, but only in a tight axial area. In front of and behind the ring body each a powerful thread balloon that brakes and thereby the thread tension level is improperly increased. Furthermore, when the thread brake is closed, the kinetic Energy of the thread balloon releases, making thread out the turns on the drum is pulled until form one or more loops of loose thread, which too Especially when it comes to the next entry process if they hang on the ring body or on the trigger eye.

In a projectile weaving machine known from DE-B-20 28 543 is a smooth discharge cone on the inside of the delivery device with a spacing over a tapered Forehead nose of the drum flipped over to form the balloon limit. The trigger cone can be adjusted axially. The effect of the inside smooth trigger cone is at the high thread speeds in modern weaving machines of this type is not sufficient. It can be a form a spatially limited balloon, the one in the cone stores large thread sounds, which occurs during braking relaxed and to form loops or loops leads.

According to the aforementioned US 34 11 548 (Figs. 8 to 13) it was therefore proposed about 30 years ago to place an additional brake on the drum, e.g. a brush ring or a felt ring that the Touches drum and fixes the thread by clamping. This is intended to pull thread from the turns on the drum when the kinetic energy is released in the thread balloon after braking the thread by the controlled thread clamp can be counteracted. Such additional brake on the drum has the serious disadvantage of a thread speed dependent strongly progressively increasing braking effect that Tension level in the thread increases inadmissibly. From these Reasons are provided in US-A-34 11 548, this additional To temporarily adjust the brake axially to temporarily reduce their influence. This motion control is technically extremely complex and sluggish because of the large masses to be moved.

Modern projectile weaving machines work with very high ones Thread speeds, e.g. up to 1500m / min. Without additional Brake on the drum of the delivery device arise when the thread is braked by the controlled thread clamp Loops that lead to frequent disturbances. That is why it has gained acceptance in practice, an additional one To provide a brake on the drum, such as the one in 8 to 15 of the type shown in US-A-34 11 548, wherein this additional brake is passive in one preselected position remains because of an axial motion control the additional brake on high-revs modern weaving machines can hardly be realized technically. The brake actively touches with bristles, teeth or discs the drum. The resulting thread speed dependent Braking effect leads to an unacceptable high tension level in the thread and is a Source of frequent thread breaks and disturbances.

The invention has for its object a projectile or rapier shooter weaving machine and a delivery device specify for such a weaving machine in which despite high thread speeds, there is a risk of malfunctions noticeably reduced by loose thread loops becomes.

The task is with the in claim 1 or in the features contained in claim 16 solved.

The hollow body leaves only one or more extreme small thread balloons arise, in which or in which relatively little excess thread length is stored. In addition, the protrusions permanently withdraw from the balloon kinetic energy. Amazingly, this one Combination effect the level of tension in the subtracted Thread even at high thread speeds in modern Looms of this type are very low. Of special The advantage is during or after braking of the thread by the controlled thread brake downstream of the delivery device, that there is so little kinetic in the little thread balloon Energy is contained on the one hand from the turns hardly any thread is drawn on the drum, and also that by engaging the controlled thread brake Low energy released by collision of the thread with the projections very quickly and effectively is consumed. The then relaxing, if necessary Thread no longer forms drooping loops, but is placed in an orderly manner on one of the storage surfaces, so that the next entry process begins trouble-free. The combination of the brake - free drum of the Delivery device with the hollow body surprisingly eliminated simply the need in modern weaving machines this Type an additional brake to prevent the dangerous Loop formation after engagement of the controlled Thread brake and the disadvantage of the high Thread tension levels during the main part of the To accept the entry process.

It is common in yarn winding technology (DE-A-26 23 916), a hollow truncated cone on the face of a cheese to arrange with inside protrusions that keep the thread balloon so small that even at high Unwinding speed takes up little space and only has a low braking effect (low thread tension). However, this is because of the continuous operation irrelevant how the thread in an abrupt deceleration or stopping.

Also when spinning, duplicating and twisting spun Thread material by means of a high-speed spindle it is customary according to US 39 58 404, a balloon limiting ring to let the spindle embrace. This ring has after inside protrusions, which are additionally inclined are in contact with the thread of local concentrated heating until melting by a to avoid increased contact area. However, it will Process carried out continuously, so that it is irrelevant is how the thread material turns during an abrupt Standstill behaves.

The hollow body can according to claim 2 with respect to the drum axis be a rotating body and is then easy to manufacture. It can be uniform in the circumferential direction Adjust the thread fault during balloon formation. Result along the generatrix of the hollow body long shelves for the delayed or stopped Thread.

According to claim 3, the hollow body is not related to the Drum axis of rotationally symmetrical bodies. The tabs and the shelves are covered solely by the Cross-sectional shape of the hollow body generated.

A star-shaped inner cross section is expedient according to claim 4 for disturbing and for depositing the thread.

In addition, according to claim 5 on the inner wall areas, define the basic protrusions, others Projections may be provided to make up a mixed form projections generated geometrically by the cross section and create additional protrusions.

According to claim 6, the thread in the balloon formation already when lifting off the peripheral surface of the drum disrupted.

According to claim 7, the hollow body is in front of the trigger edge the drum. If necessary, are in the area of Additional troubleshooting measures are provided, such as according to Claim 8 a ring body, which has a smooth inner surface may have.

The ring body is structurally simple the hollow body away.

According to claim 10 can also on the inside of the Annular projections may be provided which are the same or are similar to the tabs. It is conceivable one a different type, a different number or a different distribution the projections in the ring body than in the hollow body to choose.

According to claim 11, the hollow body and optionally the ring body is stably supported. Axial adjustability leaves the effect of the hollow body on the respective thread quality or on the respective working conditions to adjust.

The materials according to claim 12 fit practically all occurring thread qualities. The hollow body or the hollow body with its ring body is light, stable and low wear.

Dimensions that are suitable for practical use are a requirement 13 out. The hollow body is based on the shape and size of the Drum tuned.

According to claim 14, a short free thread length is between the pull-off eye and the controlled thread brake are ensured, so that the thread does not move sideways. Most conveniently, the thread brake is even on the trigger eye arranged.

According to claim 15, the withdrawal eye is through the inlet eye the controlled thread brake.

The delivery device according to claim 16 enables trouble-free Delivery of the weft thread at high thread speeds to projectile or rapier weaving machines, being because of the little balloon low thread tension level over the main part of the Entry process results while during or after braking of the thread through the controlled thread brake forms no dangerous excess thread length and dangerous Loops are suppressed. An additional passive Brake on the drum of the delivery device like it was previously necessary is unnecessary.

The delivery device according to claim 17 is compact and reliable.

Fig. 1

eine schematische Seitenansicht einer Projektil- oder Greiferschützen-Webmaschine,

Fig. 2

ein Detail aus Fig. 1 in einer Vorderansicht und einem Längsschnitt,

Fig. 3

ein abgeändertes Detail in einem Längsschnitt,

Fig. 4

eine Stirnansicht und einen teilweisen Längsschnitt eines Schußfaden-Liefergeräts für eine Projektil- oder Greiferschützen-Webmaschine, und

Fig. 5 - 12

schematische Detailvarianten.

Embodiments of the invention are explained with reference to the drawing. Show it:

Fig. 1

a schematic side view of a projectile or rapier weaving machine,

Fig. 2

2 shows a detail from FIG. 1 in a front view and a longitudinal section,

Fig. 3

a modified detail in a longitudinal section,

Fig. 4

an end view and a partial longitudinal section of a weft delivery device for a projectile or rapier weaving machine, and

5 - 12

schematic detailed variants.

On a projectile or rapier loom L 1, a weft feeder S is attached. Although mostly for alternating work Delivery devices S are provided for alternating work only one delivery device is shown. The delivery device S is a delivery device F for one Weft Y, and is with an inside protrusions V having hollow body K and a trigger eyelet E equipped. Downstream of the take-off eye E is a controlled thread brake B provided that either held for itself or is set on delivery device F.

The weft Y is from a supply spool 1 in one Housing 2 introduced approximately coaxially with an axis X. A winding member 3 which can be driven in rotation forms windings W. on a drum 4 with an approximately cylindrical circumferential or envelope surface. The hollow body is on a cantilever 5 K in a holder 6, preferably axially, adjustable, fixed at the free end of the drum 4. The trigger eye E is attached to the bracket 5 with a holder 7. The controlled thread brake B is in short distance behind the trigger eye E or closes immediately, with the trigger eyelet E at the same time can form the inlet eye of the thread brake. The thread brake B is e.g. via a control line 10 from a Control device C depending on the weaving cycle of the loom L controlled so that the weft Y at the end of an insertion (with a projectile weaving machine) braked when the projectile 12 in a catching device 14 comes to a standstill. With a rapier weaving machine L is braked at the end of the entry, and additionally in a transition phase in which a bringer gripper 12 the Weft thread on a gripper in a dashed line indicated transition area 15 in the shed 13 passes. A transfer device 11 transfers the weft Y the gripper bwz. the projectile 12. During the main part the entry process is the controlled thread brake B opened.

The hollow body K according to FIGS. 1 and 2 has the shape a truncated cone with a thin wall 16, one large diameter end 17 and a small diameter End 18 which defines a through opening 19. The Cone axis of the hollow body K coincides with the axis X of the delivery device F. On the inside of the Hollow body K are evenly or unevenly distributed Projections V inward, which, e.g., wart-like, dome-like, pyramid-shaped or also rib-shaped (as indicated at 22) are formed.

The hollow body K according to FIGS. 1, 2 and 4 engages the large diameter end 17 via a rounded or tapered trigger edge 26 at the front end of the drum 4. a End portion of the peripheral surface of the drum 4 becomes (more annular Gap) by a cylindrical ring body R, a continuation in the embodiment shown of the hollow body K is. The inner wall 24 of the Ring body R is either smooth or also with projections V (Fig. 6) protruding inwards. 23 is the transition line from the conical hollow body K to Ring body R. The ring body R may be from Hollow body K held separately and spaced from this.

The hollow body K is shown in FIG. 4 with the ring body R attached to a ring 127, which with a strap 128 sits in the bracket 6 on the boom 5. An adjustment screw 125 is used for axial adjustment of the hollow body K. The thread Y runs, for example, with a straight thread path from the trigger edge 26, without the small diameter end to touch the hollow body K, to the trigger eyelet E. Die Controlled thread brake B is immediately behind in Fig. 4 the trigger eye E or arranged on this. The hollow body K, like the ring body R, suitably exists made of light metal. The protrusions V are from the outside pressed or indented depressions.

In the embodiment according to FIG. 4, the Ring body R over approx. 44mm from trigger edge 26 to the rear, up to the area in which on the Drum 4 turns W lie. The one between the ring body R and the peripheral surface of the drum 4 present Annular gap has a width of approx. 5mm. The conical part of the hollow body K has a tip angle of approximately 120 °. The height of the projections V above the inner wall is between 2 and 5mm, the diameter of the wart-like Projections V at a cone angle of approx. 120 ° at approx. 10 to 20mm.

3 shows a conical hollow body K, of the hollow body K of FIGS. 1, 2 and 4 in the form corresponds. I indicates a straight basic generator of the Hollow body K on. Alternatively, the basic generator could also a curved line with respect to the drum axis X. II or a concave arc line III.

5 and 6 it is indicated that the hollow body K reaches over the front end of the drum 4. Then it is Outside diameter of the drum 4 is smaller than the inside diameter at the large diameter end of the hollow body K. However, it is also conceivable for the hollow body K according to FIG. 5 to position at a distance in front of the drum 4. Then the large diameter end of the Hollow body K approximately equal to the drum diameter or smaller.

6 engages the hollow body K with the integrated Ring body R either over the front end of the drum 4 (indicated by dashed lines) or it is at a distance arranged in front of the front end of the drum 4. In the first The case is the diameter of the ring body R and the large diameter End of the conical part of the hollow body K larger than the outer diameter of the drum 4. Im second case, the diameter is either the same or preferably smaller than the drum diameter. 6 is also indicated that the hollow body K storage surfaces A for the weft Y forms on which the weft Y temporarily stored in this way after braking is that it never hangs down freely.

In Fig. 7 is a modified in solid lines Embodiment of a hollow body K shown, for example is a section of a profile tube 20 that a polygonal inner cross section (a is shown Cross-section in the form of an equilateral triangle) owns and parallel to the drum axis X. Longitudinal edges in front of the front end of the drum 4 (dashed lines indicated). The drum axis X is expedient by the center of gravity of the inner cross section of the hollow body K. Between the designated 21 Corners of the inner cross section are straight or optionally curved inner wall regions 23, which as inward protrusions to influence the weft movement in the circumferential direction around the drum axis to serve. If necessary, are on the inner wall areas 23 additional projections 22, V corresponding to the Projections of the conical hollow body K according to FIG. 5, intended.

In Fig. 7 is also indicated by dashed lines that the Hollow body K a flared extension 24, which continues with the same inner cross section is and possibly over the front of the Drum 4 engages or faces this at a distance. The inner cross section of the hollow body K or the conical extension 24 is expedient smaller than the cross-section of the drum envelope. This is not an unconditional requirement. The hollow body K according to FIGS. 7 and 8 could also - as in II and III shown, arched or arched arched.

9, the hollow body K is similar to that of FIG. 7 and 8, being tapered towards the pull-off eye E. rejuvenated. The inner wall areas 23, the corners 21 connect, form the projections V im with a jacket 25 formed hollow body K. Further define the inner wall areas 23 shelves A for the relaxed decelerated weft. Within the conical course of the hollow body K according to FIG. 9 could also be a Constriction or bulging in the course of the longitudinal edges according to the dash-dotted lines II and III with Inward inclination to the trigger eye can be selected.

10 is the inner cross section of the hollow body K star-shaped with zig-zag arrangement Inner wall areas 28 which the projections V and the Define storage areas A. The hollow body K according to FIG. 10 could have a constant internal cross section Pipe section 27, or conical - as indicated at 27 ' - be.

11, the hollow body K is a cylindrical tube section 30 with axially limited inwardly projecting Projections V, e.g. at the front and rear end. The inner wall forms storage areas A. The hollow body K according to FIG. 11 could be conical or curved or constricted be.

12 shows an annular hollow body K, one base body 29 with protruding inwards Has projections V, between which storage surfaces A are present. The hollow body K according to FIG. 12 is coaxial to the drum axis. The projections V could also be rounded or shaped differently. Furthermore, they can the level of the base body 29 either to the drum or to the trigger eye or alternately bent out. It could several such hollow bodies arranged one behind the other will.

The withdrawal eye E could be stored in the end of the hollow body E. his or the end of the hollow body A as a trigger eyelet be formed. The controlled thread brake could be Then attach B directly to the hollow body K. As controlled thread brake B is expediently the one Thread-clamping thread brake B is used, as is the case with Projectile looms are common.

Claims (17)

1. A projectile or gripper shuttle loom (L) comprising a weft-thread delivery unit (F) having a stationary drum (4) for overend withdrawal of a weft yarn (Y) stored in windings (W) on said drum (4), a withdrawal eye (E) arranged in a yarn path downstream of said drum (4) and coaxial thereto, and a yarn brake (B) which is provided downstream of said withdrawal eye (E) and is controllable in response to the loom cycle, with said yarn path being enclosed from the circumferential surface of said drum (4) to said withdrawal eye (E) at least in an axially limited segment by at least one hollow body (K) which is coaxial to drum axis (X), characterized in that said hollow body (K) on its inner side has a plurality of inwardly protruding ballooning, disturbing and braking elements which end at some distance from said drum (4) while forming circumferentially acting projections (V) and deposit surfaces (A) for said weft yarn (Y).
2. A loom according to claim 1, characterized in that the inner side of said hollow body (K) has a generatrix (I, II, III) which is either straight or is concave or convex relative to said drum axis (X) and which is either in parallel with said drum axis (X) (cylindrical shape) or inwardly obliquely inclined towards said withdrawal eye (E) (conical shape).
3. A loom according to claims 1 and 2, characterized in that said hollow body (K) is a section (20) of a profile tube with a polygonal inner cross-section, preferably with a regular polygonal cross-section, i.e. a triangular cross-section, and that inner wall portions (23) which extend between corners (21) of said cross-section form said ballooning, disturbing and braking elements (V) and said deposit surfaces (A).
4. A loom according to claims 1 and 2, characterized in that, when viewed in cross-section, said hollow body (K) has a star-shaped inner side, for instance with inner wall portions (28) abutting on one another in zigzag-shaped fashion.
5. A loom according to claims 3 and 4, characterized in that further projections (V) protrude inwardly from said inner wall portions (23, 28).
6. A loom according to at least one of the preceding claims, characterized in that said hollow body (K) extends from the side of yarn eye (E) over a withdrawal edge (26) of said drum.
7. A loom according to at least one of claims 1 to 5, characterized in that said hollow body (K) is arranged between a withdrawal edge (26) of said drum (4) and said withdrawal eye (E), and that preferably the inner cross-section of said hollow body is smaller, at least at a point between said withdrawal edge and said withdrawal eye, than the cross-section of the enveloping surface of said drum (4).
8. A loom according to claim 1, characterized in that said drum (4) has an enveloping surface extending in approximately axially parallel fashion up to said withdrawal edge (26), and that a cylindrical annular body (R) surrounds said enveloping surface near said withdrawal edge (26) at a radial distance.
9. A loom according to claim 8, characterized in that said annular body (R) is a preferably integral cylindrical extension of a hollow body (K) comprising projections (V) and deposit surfaces (A) on its inside.
10. A loom according to claims 1 and 8, characterized in that the inside of said annular body (R) has also provided thereon inwardly protruding projections (V) whose inner end portions are spaced apart from said drum.
11. A loom according to at least one of claims 1 to 10, characterized in that said hollow body (K) and, optionally, said annular body (R) is/are fixed in a mounting (6) on an extension arm (5) of said delivery unit (F), preferably in an axially adjustable manner.
12. A loom according to at least one of claims 1 to 11, characterized in that said hollow body (K) is a shaped part of light metal, metal or plastics.
13. A loom according to at least one of claims 1 to 12, characterized in that at a drum diameter of about 100 mm said conical hollow body (K) which has a cone angle of about 120° includes a large end diameter of about 110 mm, a small end diameter of about 41 mm and an axial height of about 30 mm, that said withdrawal eye (E) is spaced apart from the face end of said drum (4) approximately 47 mm, and that the optionally provided annular body (R) has an axial length of approximately 44 mm at an inner diameter of about 110 mm, and that said protrusions (V) are formed as domes or pyramid-shaped members having a height of between 2 and 5 mm.
14. A loom according to claim 1, characterized in that said controlled yarn brake (B) is provided near said withdrawal eye (E), preferably directly next to said withdrawal eye (E).
15. A loom according to claim 1, characterized in that said withdrawal eye (E) is a feeding eye of said controlled yarn brake (B).
16. A delivery unit (F) for a projectile or gripper shuttle loom (B), comprising a drum (4) stationarily mounted on a housing (2), on which a weft yarn (Y) can be wound in windings by means of a rotationally drivable winding unit (3) and from which said weft yarn (Y) can be withdrawn from said windings in overend fashion over a withdrawal edge of said drum (4) through a yarn eye (E) which is coaxial to said drum (4) and arranged in front of the face end of said drum, characterized in that said delivery unit (F) comprises at least one hollow body (K) which is coaxial to said drum and whose inside comprises a plurality of inwardly protruding ballooning, disturbing and braking elements which are spaced apart from said drum (4) while forming circumferentially acting projections (V) and deposit surfaces (A) for said weft yarn (Y).
17. The delivery unit according to claim 16, characterized in that a controlled yarn brake (B) is arranged downstream of or on or directly at said withdrawal eye (E).

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