EP0158655B1 - Method of operation of an automatic weaving loom and application of such method - Google Patents

Abstract

The automatic weaving loom is first stopped by an error signal from a weft break stop-motion (110). To search for the weft, the weaving program of a control device of a shedding unit is reset and the search is carried out while the automatic weaving machine is advancing. Similarly, the material transport is also brought back to the initial position. To simplify the method, the advancing of the weaving program is blocked at each weft search cycle to the warp pitch following the one wherein the broken weft yarn (130a) is searched. The warp pitch to be examined forms thus a double warp pitch (134) which remains open on two wefts. Once the weft search is terminated, the normal weaving process starts again but if another broken weft yarn is found, the weft search cycle is repeated each time for the preceding warp pitches until all the broken weft yarns are found.

Description

The invention relates to a method for controlling a loom according to the preamble of claim 1 and an application of the method.

Methods of the type mentioned at the outset are known, for example from DE-OS 25 14 248. However, the method described there has the disadvantage that in addition to the stop, which is caused by an error signal from a weft thread monitor, the weaving machine also has a further weft search cycle must make two stops before the normal weaving process can continue. Only a normal shed is available for the weft search, so there are strict limits to stopping and restarting the loom. The known method is therefore cumbersome and time-consuming.

The object of the invention is to provide a method for controlling a weaving machine which does not have the disadvantages mentioned. Furthermore, a double-shaft loom should also be able to be operated with the method.

The stated object is achieved on the one hand by the characterizing features of claim 1 and on the other hand by the features of claim 11.

Because the shed to be examined is designed as a double shed for the weft search cycle, there is on the one hand the advantage that there is more scope for stopping the loom. On the other hand, from this position of the weaving machine used for weft searching, the weaving machine can be started up again without the weaving machine first having to be brought into a starting position. The process is thus easier and faster and therefore more economical.

Advantageous developments of the method are specified in claims 2 to 10 and advantageous developments of the application in claims 12 to 14.

In the first shot search cycle, an embodiment according to claim 2 is advantageous. For the following weft search cycles, according to claim 3, there is no need to run over an additional shed.

It when the loom stops due to the error signal of the weft monitor in a specialist intersection is particularly advantageous. This enables the synchronization of the two weaving machine units, particularly in the case of double-shaft weaving machines. For a single weaving machine, the method according to claim 5 is recommended, since then such high accuracy requirements are not to be made when stopping. The same also applies to stopping in the double loom according to claim 6. The configuration of the method according to claim 7, on the other hand, is particularly important for use with double-shaft looms, since this facilitates the synchronous restarting of the two loom units, in particular when a machine unit has been uncoupled for the shot search cycle.

A further development of the method according to claim 9 is also particularly advantageous since any errors in the material web can then be avoided. The correction factor is freely selectable and usually depends on the properties of the goods to be manufactured. The correction factor is therefore only set once for the production of a certain product.

After the first weaving machine stop caused by the weft guard, the method can expediently be triggered according to claim 9. However, it is also conceivable to trigger the weft search cycle directly by the error signal of the weft monitor.

The method can be used for weaving machines of any kind. Its use according to claim 11 in a double-shaft loom is particularly advantageous. According to claim 13, the weaving machine unit not affected by the weft break can be uncoupled during the weft search. According to claim 12, however, it is also possible to let the weaving machine unit not affected by the weft break during the weft search. The shedding devices of the weaving machine units can run synchronously or be out of phase by 180 ° according to claim 14.

• Figur 1 eine einfache Webmaschine im Ausschnitt und in Ansicht auf die

Kettablassvorrichtung;

• Figur 2 die Webmaschine der Figur 1 im Schnitt 11-11 der Figur 1;
• Figur 3 das Rückschaltgetriebe in Seitenansicht;
• Figur 4 das Rückschaltgetriebe im Schnitt IV-IV der Figur 3;
• Figur 5 eine Doppelschaftwebmaschine in schaubildlicher Darstellung;
• Figuren 6a bis 6d ein Webfachdiagramm (Figuren 6a bis 6c) und ein Warendiagramm (Figur 6d) in verschiedenen Phasen des Schussuchens bei einer einfachen Webmaschine;
• Figuren 7a bis 7d ein Webfachdiagramm (Figuren 7a bis 7c) und ein Warendiagramm (Figur 7d) in verschiedenen Phasen des Schussuchens bei einer Doppelschaftwebmaschine bei gleichzeitigem Mitlaufen beider Webmaschinen-Einheiten; und
• Figuren 8a bis 8d ein Webfachdiagramm (Figuren 8a bis 8c) und ein Warendiagramm (Figur 8d) in verschiedenen Phasen des Schussuchens bei einer Doppelschaftwebmaschine, wobei die nicht vom Schussfadenbruch betroffene Webmaschinen-Einheit abgekuppelt wird.

Exemplary embodiments of the invention are described in more detail below with reference to the drawings, in which:

• Figure 1 shows a simple loom in detail and in view of the

Warp let-off device;

• Figure 2 shows the weaving machine of Figure 1 in section 11-11 of Figure 1;
• Figure 3 shows the reverse gearbox in side view;
• Figure 4 shows the downshift transmission in section IV-IV of Figure 3;
• Figure 5 shows a double-shaft loom in a diagrammatic representation;
• FIGS. 6a to 6d show a shed diagram (FIGS. 6a to 6c) and a goods diagram (FIG. 6d) in different phases of picking in a simple weaving machine;
• FIGS. 7a to 7d show a shed diagram (FIGS. 7a to 7c) and a goods diagram (FIG. 7d) in different phases of weft searching in a double-shaft weaving machine with simultaneous running of both weaving machine units; and
• FIGS. 8a to 8d a shed diagram (FIGS. 8a to 8c) and a goods diagram (FIG. 8d) in different phases of weft searching in a double-shaft weaving machine, the not being from The weaving machine unit affected by the weft break is uncoupled.

Figures 1 to 4 show a first embodiment of a weaving machine, a warp let-off device 2, a goods take-off device 4, a shedding device 6, a main drive 8 with a drive motor, not shown, a downshift gear 10 connected to the warp let-off device 2 and the goods take-off device 4, and an electronic Has control device 12 for a weaving program. A reed 14 and a weft insertion element 16 are connected to the main drive 8 in a manner not shown in detail, for example, from CH-PS 633 331.

The warp let-off device 2 contains a warp beam 18, the shaft 20 of which is driven by a worm gear 22. The warp threads 24 pass from the warp beam 18 via a match beam 26 to the shafts 28 of the shedding device 6; which serve to form and change the warp compartment 30. The weft insertion element 16 engages periodically in the warp pocket 30. The registered weft thread is attached to the fabric edge 32 by means of the reed 14. The woven fabric 34 is stretched over the draw boom 36 and pulled off and rolled up on the fabric tree 38. The goods take-off device 4 containing the pull boom 36 and the goods tree 38 is driven by a regulating gear 40.

To drive the warp let-off device 2, the goods take-off device 4 and the shedding device 6, a secondary drive shaft 46 is connected to the main drive 8 via bevel gears 42, 44. This carries a gear 48, which drives a drive wheel 52 for the warp let-off device 2 and the take-off device 4 and a drive wheel 54 for the shedding device 6 via a toothed belt 50.

The shedding device 6 contains a dobby 56, the drive shaft 58 of which is optionally connected to the drive wheel 54 with the interposition of a clutch 60. The dobby 56, which is constructed and controlled, for example, according to EP-OSen 0 056 098 and 0 068 139, has shaft rockers 62, each of which is connected to a shaft 28 via a lever drive 64 and which enables the shed to be made via at least two Keep weft insertion processes open.

The drive wheel 52 for driving the warp let-off device 2 and the goods take-off device 4 is connected via the downshift gear 10 designed as a superposition gear to a drive shaft 66 which on the one hand drives the worm gear 22 of the warp let-off device 2 and on the other hand the regulating gear 40 of the goods take-off device 4. The drive wheel 52 is arranged on a bearing sleeve 68 which is rotatably mounted on the drive shaft 66. The bearing sleeve 68 projects into a housing 70 and carries a gear 72 with which a planet gear 74 meshes. The latter is rotatably arranged on a shaft 76 which is rotatably mounted in a planet carrier 78 which in turn is rotatably supported on the drive shaft 66. On the other side of the planet carrier 78, a further planet gear 80 is connected in a rotationally fixed manner to the shaft 76 on the shaft 76. The second planet gear 80 meshes with a gear 82 arranged on the drive shaft 66 in a rotationally fixed manner. The planet carrier 78 is designed as a worm gear and contains on its periphery a worm toothing 84 which cooperates with a worm gear 86, the drive shaft 88 of which is connected to an auxiliary motor 90. The worm gear formed from the worm gear 84 and the worm wheel 86 is preferably designed to be self-locking. The downshift transmission 10 is also equipped with a braking device 92 to prevent overrun. The brake device 92 has a friction disk 94, which is arranged on the drive shaft 88 in a rotationally fixed manner, with which a friction disk 96, which is arranged in a rotationally fixed manner in the housing 70, interacts. A pin 98 arranged on the friction disk 96 engages in a groove 100 in the housing 70, which lies parallel to the drive shaft 88 and prevents the friction disk 96 from rotating. A biasing spring 102 biases the stationary friction disk 96 against the friction disk 94 connected to the drive shaft 88.

The drive shaft 66 is interrupted by means of a clutch 104 on the part going to the warp let-off device 2. This clutch is designed, for example, as a claw clutch, which can be switched via a shift lever 106 and an actuating device 108, so that the drive of the warp let-off device 2 can be switched off if necessary.

• ST Normaler Start
• SP Normaler Stopp
• SZ Vorbereitung des Schussuchzyklus
• KG Normaler Kriechgang vorwärts
• K Korrekturfaktor-Auslösen

The weaving machine is equipped with the electronic control device 12, which is connected on the one hand to the dobby 56 of the shedding device 6 and on the other hand to the auxiliary motor 90 of the downshift transmission. Thread monitors, such as the weft monitor 110, are also connected to the control device 12. The control device also contains a number of pushbuttons for triggering various functions:

• ST Normal start
• SP Normal stop
• SZ preparation of the shot search cycle
• KG Normal crawl forward
• K Triggering the correction factor

The correction factor is entered beforehand using the code switch and product-specific and triggered using the K push button. The correction factor K can be triggered freely, for example after: normal or longer standstill of the weaving machine; Warp thread breaks; Shot search.

The electronic control device, which is expediently provided with a processor, enables the weaving program to be switched back when the weaving machine is running forward, so that the dobby 56, which is driven in the forward direction, executes a reversing movement sequence. At the same time, the control device controls the auxiliary motor 90 of the downshift transmission 10, so that the warp let-off device 2 and the goods take-off device 4 can be switched back for the purpose of searching for a broken weft thread, as will be explained in more detail below with reference to FIGS. 6a to 6d.

FIG. 5 shows a double-shaft loom in a diagrammatic representation, in which two loom units 112, 114 arranged next to one another are connected to a common drive device 116. Each weaving machine unit 112, 114 contains its own shedding device 118, 120, which are also connected to the common drive device 116. Furthermore, the double-shaft loom contains a control device 122 with corresponding push buttons ST, SP, SZ, KG and K, the function of which has been explained in connection with FIG. 1.

The double-shaft weaving machine, which is explained in more detail in DE-OS 31 34 184, is designed as a two-phase rapier weaving machine. The shedding devices 118, 120 actuate the shafts 124, 126 of the individual shedding devices 118, 120 of the weaving machine units 112, 114 out of phase, namely by an angle of 180 °. The control of this double-shaft loom is described in more detail in FIGS. 7a to 7d and 8a to 8d.

FIGS. 6a, 6b and 6c show shed diagrams for a weaving machine of FIGS. 1 to 4 in the first weft search cycle and in the second and third weft search cycles. FIG. 6d shows the goods diagram belonging to the above shed diagrams. The individual weave compartments 128 formed from the warp threads 24 each carry the associated weaving program step numbers 3 to 7. Weft threads 130 are inserted in the individual weave compartments 128. The clock pulse for the next but one shed is picked up at cycle point 132.

The shot search happens as follows:

As can be seen in FIG. 6a, the weft monitor 110 detects a broken weft 130a in the shed 128 with the weaving program step number 5. A stop pulse is then triggered and the weaving machine comes to a standstill at the end of the following shed 128 with the weaving program step number 5 + 1 = 6. At the same time, the weaving program of the control device 12 is reset by one weaving program step and the counter which responds to the cycle point 132 is blocked. Any weft 130b located in this shed can be removed. The pushbutton KG is now pressed and the weaving machine continues to run in the crawl to the next shed 128 with the deferred weaving step number 5.

Since the counter for the cycle point 132 is blocked, the weaving program cannot be switched further, so that the weaving program step number 5 applies to the subsequent shed. This means that the shed does not close the first time, but only after the second time. The weaving machine now stops in the first half of the double weaving shed 134 thus formed with the weaving program step number 5. Any broken weft thread 130a can now be removed. If this breaks the weft thread break, the weaving machine can be restarted by pressing the ST pushbutton to continue the normal weaving process and the normal consequent weaving program step numbers 6, 7, etc. close. back to. The first weft 130 is already inserted in the second half of the double shed 134. During this first shot search cycle, the goods take-off is simultaneously postponed by one shot step, as can be seen from the goods diagram in FIG. 6d.

If it is determined on the double weaving shed 134 with the weaving program step number 5 that a further broken weft thread is to be searched for, then the pushbutton SZ must be pressed, which prepares the further weft searching cycle by resetting the weaving program on the control device by one weaving program step and locking the cycle counter becomes. By pressing the pushbutton KG again, the weaving machine is put into crawl and moves to the first area of the double weaving shed 134 with the weaving program step number 4. At the same time, the goods take-off is set back by one weft step. If it is now determined that the weft search has now ended, the normal weaving process can be triggered again by pressing the start button ST, a weft thread 130 being inserted again into the second half of the double shed 134 with the weaving program step number 4.

The weaving process is now normal again. If, on the other hand, it is found in the first half of the double shed 134 that another broken weft thread is to be found, a further weft search cycle of the type described above takes place.

FIGS. 7a to 7d show a first, second and third weft search cycle for a double-shaft loom of the type shown in FIG. 5, the upper shed diagram being on the right loom Unit 112 and the lower shed diagram associated with the left loom unit 114.

If a weft monitor of the right weaving machine unit 112 detects a weft break in the shed 128 with the weaving program step number 5, the double-shaft loom stops at the subsequent shed crossing point 136. The first weft search cycle is triggered by actuating the pushbutton SZ. As a result, the weaving program in the control device is reset by one weaving program step and the cycle counter is temporarily blocked. The regulator for the withdrawal of goods on the weaving machine unit, on which the weft thread breakage is determined, is reset. The entire double-shaft loom is shifted forward in the crawl gear, namely by two weft steps or one revolution of the shaft of the shedding device. By switching back the weaving program step and blocking the cycle counter, a double weaving shed 134 with weaving program step number 5 is again created. The double-shank weaving machine now stops at the false crossing point 138 of the double weaving shed 134. Broken weft threads 130a are removed. If it is determined that there is no further broken weft thread, the double-shaft loom can be switched on again by pressing the start button ST and brought into the normal weaving process, a first weft thread 130 already being introduced into the second half of the double weaving shed 134.

If, on the other hand, another broken weft thread is found, the pushbutton SZ is actuated again, whereupon a second weft search cycle according to FIG. 7b is triggered. The double-shaft weaving machine now again holds in a double-weaving shed 134 with the next lower weaving program step number 4. A broken weft thread 130a is removed. If a broken weft thread can no longer be determined, the double-shaft loom can be restarted by pressing the start button ST and the normal weaving process can be triggered. A first weft thread 130 is already inserted in the second half of the double shed 134.

This configuration of the control device and the double-shaft loom has the advantage that the double-shaft loom is of a very simple construction, since no weft search mechanism is required. This results in good accessibility to the specialist training devices. Only one key press is required to trigger a shot search cycle.

The regulator is equipped with a regulator coupling for switching back goods in order to couple the regulator to return.

FIGS. 8a to 8c show the shed diagrams of a double-shaft loom in which, when a weft break in a weaving machine unit is eliminated, the other loom unit is uncoupled until the weft search is finished. The shot search is carried out analogously to the exemplary embodiment in FIGS. 7a to 7c. The fact that the double-shaft weaving machine stops the affected weaving machine unit in the next intersection point 136 when a weft thread breakage occurs and the weft thread monitor indicates that this ensures that the other weaving machine unit is uncoupled exactly. Since the weaving machine unit also comes to a standstill in the false crossing point 138 of the double weaving shed 134 when searching for weft, the exact same conditions result as when the other weaving machine unit is uncoupled, so that the coupling can also be taken back synchronously up to 8c and the goods diagram 8d.

The advantage of this solution variant is that the double-shaft loom stands still and the shed is only moved on the broken side. There is no risk of damage to the shedding device. Only one key press is required per shot search cycle.

Claims (14)

1. Method of controlling a weaving machine, which is stopped by an error of a filling breakage detector, wherein for pick finding, the weaving program of a control device of a shedding apparatus is set back and the pick finding occurs with the weaving machine running forward, wherein additionally at least the cloth takeup is correspondingly set back, characterized in that the step-by-step action of the weaving program in each pick finding cycle is blocked at least for that shed, which follows the shed in which the ruptured filling thread is being searched for, in such a way that the shed in which the ruptured filling thread is being searched for, is held open, at least as a double shed, during at least two filling cycles, whereupon the continuation of the sequentially correct next normal weaving process is triggered or, prior to that triggering, the pick finding cycle is repeated, for respective preceding sheds accompanied by corresponding set backs of the weaving program, until the ruptured filling thread or possibly further ruptured filling threats are found.

2. Method according to claim 1, characterized in that during the first pick finding cycle, the weaving program for the next shed, which follows the shed in which the weaving the weaving machine stops, is set back to the weaving program stage number of the shed to be examined preferably by one weaving program stage number.

3. Method according to claim 2, characterized in that the weaving program of the pick finding cycles following the first pick finding cycle, is respectively set back by a further weaving program stage number.

4. Method according to claim 1, characterized in that the weaving machine stoppage, caused by the filling breakage detector, occurs in the first shed crossing following the filling thread rupture.

5. Method according to claim 1, characterized in that the weaving machine stoppage, caused by the filling breakage detector, occurs between the first and the second shed crossing following the filling thread rupture.

6. Method according to claim 1, characterized in that, in each pick finding cycle, the weaving machine is stopped in the area of the double shed to be examined.

7. Method according to claim 1, characterized in that, in each pick finding cycle, the weaving machine is stopped in the false crossing of the double shed.

8. Method according to claim 1, characterized in that, for a pick finding cycle, at least the fabric takeoff and possibly the warp letoff are set back by a magnitude G, whereby

G = K. L

in which means:

L the cloth length between two filling insertions,

K a correction factor, wherein K = 0.1 to 4.

9. Method according to claim 1, characterized in that the pick finding cycle is triggered by means of a hand actuated switch.

10. Method according to claim 1, characterized in that the pick finding cycle is triggered by the filling breakage detector.

11. Application of the method according to claim 1 in a double dobby weaving machine, in which two weaving machine units arranged one next to the other comprise a common drive and two separate shedding apparatus.

12. Application according to claim 11, characterized in that the weaving machine unit not experiencing a filling thread rupture is allowed to continue to operate.

13. Application according to claim 11, characterized in that the weaving machine unit not experiencing the filling thread rupture is decoupled from the drive during the pick finding in the other weaving machine unit.

14. Application according to claim 11, characterized in that the shedding apparatus of the weaving machine units operate staggered phasewise by 180°.

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