EP0208725A1

EP0208725A1 - Method for the control of a weaving loom and weaving loom for implementing such method

Info

Publication number: EP0208725A1
Application number: EP86900598A
Authority: EP
Inventors: Francisco Speich
Original assignee: Textilma AG
Current assignee: Textilma AG
Priority date: 1985-01-17
Filing date: 1986-01-17
Publication date: 1987-01-21
Also published as: US4724872A; CH671591A5; JPS62501511A; WO1986004365A1

Abstract

Le métier à tisser est arrêté par un signal d'arrêt spécial, par exemple par un signal d'erreur d'un casse-chaîne (112) à l'apparition de la rupture d'un fil de chaîne (140). La commande est contrôlée par un dispositif de commande électronique (12) ayant une mémoire de programmes pour métier à tisser (WS) et une mémoire de sous-programme (HS) et un microprocesseur (R). A l'apparition du signal d'arrêt, est enclenché le sous-programme qui commute le pas de programme du pas de chaîne, dans lequel le métier à tisser s'arrête et de cette manière également le dispositif d'armure (6), sur l'armure inverse et qui fait actionner à l'arrière le métier à tisser sur le premier croisement de l'armure. De cette manière, tous les oeillets de conduite des fils (29) du dispositif d'armure sont amenés dans une position intermédiaire (144). Par ces mesures on obtient une série d'avantages, en particulier la détection et l'élimination d'un fil de chaîne cassé est facilitée par l'accessibilité améliorée des fils et on évite aussi les allongements excessifs des fils de chaîne (24). De cette manière la régularité du tissu (34) est améliorée.The loom is stopped by a special stop signal, for example by an error signal from a warp breaker (112) when a warp thread (140) appears to break. The control is controlled by an electronic controller (12) having a loom program memory (WS) and a subprogram memory (HS) and a microprocessor (R). When the stop signal appears, the subprogram is started which switches the program step of the warp step, in which the loom stops and in this way also the weave device (6), on the reverse weave and which operates the loom at the rear on the first crossing of the weave. In this way, all the wire conductor eyelets (29) of the armor device are brought to an intermediate position (144). By these measures a series of advantages are obtained, in particular the detection and elimination of a broken warp thread is facilitated by the improved accessibility of the threads and excessive elongation of the warp threads (24) is also avoided. In this way the regularity of the fabric (34) is improved.

Description

Method for controlling a weaving machine and weaving machine for carrying out the method.

The invention relates to a method for controlling a weaving machine according to the preamble of claim 1 and a weaving machine for carrying out the method according to the preamble of claim 6.

Methods and weaving machines of the type mentioned are known for example from CH-PS 590 358. In this method and this weaving machine, after the loom has come to a standstill, the shafts are moved back to the shed crossing device by means of the motor of a weft finder via the shedding device, from which the weaving machine starts up in response to a start signal in phase correspondence with the weaving machine and the continuation of the normal weaving process triggers. This weaving machine does not contain a control device for controlling the specialist image device according to a weaving program. At most, a certain modest web program with a small repeat can be permanently set on the shedding device. In this case, however, it is not possible to achieve an exact warp thread equation, since certain thread guide eyelets will remain in the upper compartment or in the lower compartment due to the weaving pattern in the compartment crossing point. An exact warp thread equality would only be given with the plain weave, ie the 1/1 weave. In the absence of equality, on the one hand, finding the broken warp thread, which can also be in the lower, upper or middle pocket, and on the other hand tying the broken warp ends together poor accessibility difficult. In addition, when the loom is stopped, prolonged stopping leads to greater stretching of the warp threads that are located in the upper and lower shed, in particular compared to those warp threads that are located in the area of the middle shed. This results in fabric defects after the error has been corrected and the weaving machine restarted, which can lead to rejects.

From EP-OS 0 116 292 a weaving machine with an electronic control device for the control of a shedding device according to a travel program is known, a downshift gear for searching for weft being present. However, the weaving machine does not contain any means for equalizing warp threads.

The object of the invention is to find a method for operating a weaving machine and a weaving machine for carrying out the method, by means of which the disadvantages mentioned can be avoided.

According to the invention, the object is achieved in a method of the type mentioned at the outset by the characterizing features of claim 1 and in a weaving machine of the type mentioned in the beginning by the characterizing features of claim 6.

Due to the fact that in the case of a special stop signal, which can be triggered, for example, by a hand switch to switch off the weaving machine or is an error signal from a warp thread monitor, the auxiliary program detects the weaving program step of the weaving shed in which the weaving machine stops, as well as the specialist image device on the inverse weave , ie switches the reverse or negative binding, all thread guide eyelets must Returning the weaving machine to the first previous intersection to take the inverse position will force you to the middle position, no matter how complicated the weaving program may be. A complete warp thread equality is thus achieved in the middle position, so that the warp threads are not stretched differently and are optimally accessible, in particular a faulty warp thread can also be found quickly, since all the warp threads lie in one plane. This means that there are no defects in the fabric even when the weaving process is interrupted for a long time. The optimal accessibility also enables the ends of a broken warp thread to be quickly tied together.

Advantageous embodiments of the method are described in claims 2 to 5.

It is expedient if the loom is stopped according to claim 2.

It is particularly expedient if the procedure is as claimed in claim 3, so that the special stop signal, for example the error signal from the warp thread monitor, immediately prevents the introduction of a further weft thread until the looms start

If necessary, it may be appropriate to reset the goods take-off and possibly the warp let-off according to claim 4 by a reset amount in order to avoid any errors in the fine material web. The correction factor for the reset variable is freely selectable and usually depends on the properties of the goods to be manufactured. The correction factor is therefore only set once during the production of certain goods and only changed when the type of goods is changed. According to claim 5, the special stop signal can be an error signal of a warp thread detector. Expediently, however, it can also be triggered by means of a hand switch if the weaving machine is to be stopped for a long time, for example overnight or over a weekend.

A loom suitable for carrying out the method is described in claim 6.

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

FIG. 1 shows a weaving machine in external view and in view of the warp let-off device;

Figure 2 shows the loom of Figure 1 in section II-II 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; and

FIG. 5 shows a shed diagram in various phases of troubleshooting in the event of a warp thread break when the weaving program is reversed.

Figures 1 to 4 show an embodiment of a weaving machine, the warp let-off device 2, a goods take-off device 4, a shedding device 6, a main drive 8 with a drive motor 9, a downshift gear connected to the warp let-off device 2 and the goods take-off device 4 10 and an electronic control device 12 for a weaving program. A reed 14 and a weft insertion element 16 are connected to the main drive 8, for example in a manner not known from CH-PS 633 331, not shown.

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 with the thread guide eyelets 29 of the shedding device 6, which serve to form and change the warp shed 30. The weft insertion element 16 engages periodically in the warp compartment 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 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 goods take-off device 4 as well as a drive wheel 54 for the specialist image 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 with a lever drive 64 with a Shaft 28 are connected. Another type of shedding device with individual strand control can be used, for example according to DE-OS 33 01 931.

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 with a drive shaft 66 which on the one hand the worm gear 22 of the warp let device 2 and on the other hand drives 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 protrudes 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 mounted 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 gear 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 rotation of the friction disk 96. 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 down 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.

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 drive motor 9 and to the auxiliary motor 90 of the downshift transmission. Thread monitors, such as the weft monitor 110 and the warp monitor 112, are also connected to the control device 12. The electronic control device has the usual structure of a more programmable control. It contains a central processing unit B1 with a freely programmable web program memory WS, e.g. a RAM memory, and an auxiliary program memory HS and a process computer R which processes all signals and information for controlling the weaving machine. The control device also contains various control blocks and a series of pushbuttons for triggering various functions:

B1 Central unit B2 Warp thread error control block B3 Loom drive control block B4 Goods take-off control block with correction factor setting WS web program memory

HS utility program memory

ST Normal start

SP Normal stop

SS special stop

SZ preparation of the shot search cycle

KG Normal crawl forward

KA reset variable release button

The reset variable G is entered beforehand and in a product-specific manner using the correction switch 114 and triggered using the trigger button KA. The correction factor K can be chosen freely, such as after: normal or prolonged standstill of the weaving machine; Warp thread breaks; Shot searches etc. and is decisive for the provision of the goods deduction per program step to be postponed. The reset variable G is:

G = K x L mean:

L fabric length between two weft threads K correction factor,

where K = 0.1 to 4.

In the control device 12, the warp thread error control block B2 is connected to the warp thread monitors 112 via a line 116 and to the central unit B1 via a line 118. The weaving machine drive control block B3 is connected via a line 124 to the drive motor 9 and via a line 126 to the central unit B1. Finally, there is the withholding tax Block B4, which contains the correction switch 114 for setting the reset variable G, is in turn connected to the central unit B1 by means of the line 128 and to the auxiliary motor 90 of the reverse gear 10 via the line 130. The central unit B1 is connected to the dobby 56 via the line 132.

The electronic control device makes it possible to switch the weaving program back when the weaving machine is running forward, so that the dobby 56, which is driven in the forward direction, executes a downward program sequence. At the same time, the control device controls the weaving machine drive motor 9 and the auxiliary motor 90 of the rucksack 10, so that the warp let-off device 2 and in particular the fabric take-off device 4 can be switched back for troubleshooting in the event of a weft thread break and / or warp thread breakage, as further below is explained in more detail. However, the control device can also run the entire weaving machine back.

FIG. 5 shows a shed diagram for a weaving machine. The individual weaving shed 134 formed from warp threads 24 each carry the associated weaving program steps S4, S5, S6, S7, S8. Weft threads 136 are inserted in the individual weaving compartments 134. At a cycle point 138, the clock pulse for advancing the web program is taken. The clock pulse can be used to advance the weaving program of the next shed or, as in the present example, the next but one shed.

A warp thread break is eliminated as follows: If the warp thread monitor 112 detects a warp thread break 140 in the shed 134, for example with the weaving program step S5, then the weaving machine is stopped in the next open shed with the weaving program step S6, specifically after the program reading point 141. the next web program step S7 is activated. Due to the error signal of the warp thread monitor 112, however, the continuation of the weaving program in the weaving program memory WS of the central unit B1 is interrupted and switched to an auxiliary program of the auxiliary program memory HS for the central position of the shafts 28. In order to set the shedding device at the shedding point 142 in such a way that all the thread guide eyes 29 of the shafts 28 assume the middle position 144 (FIG. 2), the shedding device is moved further or back to the last shedding point 142 due to the auxiliary program according to curve 146. The respective weaving program step S6 and thus also the shedding device is switched over to the inverse weaving program step S6 '. Due to this switchover to the inverse binding, all shafts and thus thread guide eyelets must assume the negative, ie inverted, position. This reversal movement takes place during the backward movement into the intersection point, in which all the shafts and thus the thread guide eyelets are forced to assume the central position. To execute this backward movement, the drive motor 9 is switched in its direction of rotation. At the same time, the control device can use the central unit B1 and the goods take-off control block B4 to move the goods take-off and, if necessary, the warp let-back by a corresponding reset variable G, this variable being correctable by a correction factor K at the correction switch 114. Now the warp thread break is eliminated and the weaving machine is switched on again at the start button ST, the auxiliary program switches the control device on again Normal program, so that the shedding device resumes the logical weaving program position existing at the intersection 142. The weaving process is now continued in the correct position, as can be seen from the lower shed diagram of FIG. 5.

As soon as a warp thread break signal is generated at the warp thread monitor 112, further insertion of weft threads 136 into the shed 134 is prevented. If necessary, it may be appropriate to remove a weft thread 136 that has already been inserted.

The special stop signal caused by the error signal described above can also be triggered by the special stop key SS, in which case the same processes are triggered as in the case of the error signal. The only difference is that there is no troubleshooting. While the normal stop button SP will always be triggered when an immediate stop is desired, the special stop button is actuated when a central position of the thread guide eyelets is desired. The latter can be the case when converting the weaving machine and in particular when the weaving machine is at a standstill for a longer period of time in order to avoid different stretching of the warp threads and thus fabric defects.

Further exemplary embodiments are also possible. Instead of the backward movement of the entire weaving machine, the dobby of the specialist image device can also be uncoupled from the main drive and reset for itself by means of an auxiliary drive. Reference list

B1 central unit

B2 warp thread control block

B3 loom drive control block

B4 Deduction control block

G Reset size

HS auxiliary program memory

K correction factor

KG Normal crawl forward

KA reset variable release button

L Length of goods between two weft threads

R process calculator

S1 ... weaving program step number

ST Normal start

SP Normal stop

SS special stop

SZ Preparation of the warp thread search cycle

WS web program memory

2 warp let-off device

4 goods take-off device

6 technical picture device

8 main drive

9 drive motor 10 reverse gear 12 electronic control device 14 reed 16 weft insertion member 18 warp tree 20 shaft of 18 22 worm gear 24 warp threads 26 Match 28 Shaft 29 Thread guide eyelet 30 Warp shed 32 Goods edge 34 Goods 36 Draw beam 38 Goods tree 40 Regulating gear 42 Bevel gear 44 Bevel gear 46 PTO shaft 48 Gear 50 timing belt 52 Drive gear for 2 54 Drive gear for 6 56 shaft machi ne 58 Drive shaft 60 Shaft coupling 62 Shaft link 64 Lever drive 66 Ant drive shaft 68 bearing sleeve 70 housing 72 gear 74 planet gear 76 shaft 78 planet carrier 80 planet gear 82 gear 84 worm gear 86 worm gear 88 Drive shaft 90 Auxiliary motor 92 Brake device 94 Friction disk 96 Friction disk 98 Pin 100 Groove 102 Bungee spring 104 Switching clutch 106 Shift lever 108 Actuating device 110 Weft thread monitor 112 Warp thread monitor 114 Correction switch 116 Line B2 with 112 118 Line B2 with B1 124 Line B3 with 9 126 Line B3 with B1 128 line B4 with B1 130 line 84 with 90 132 line 81 with 56 134 shed 136 weft 138 cycle point 140 warp thread break 141 program reading point 142 intersection point 144 middle position 146 curve

Claims

Patent claims

1. A method for controlling a weaving machine which has a shedding device with a control device and a warp let-off device and a goods take-off device, the weaving machine stopping in a shed at a special stop signal and the control device moving back by means of an auxiliary program at least to the first past intersection point, around the thread guide eyelets Bring shed forming device in the middle position and the weaving machine starts on the start signal with the consequent weaving program step from the intersection point, characterized in that an electronic control device with a program memory for a weaving program and the auxiliary program and with a process computer is used, the auxiliary program being the weaving program step of the shed in which the weaving machine stops, and the shed forming device switches to the inverse weave and the weaving machine to the first past shed The site moves back, stops and switches the inverse link back to the normal link according to the web program.

2. The method according to claim 1, characterized in that the loom is stopped after a program reading point in the open shed.

3. The method according to claim 1, characterized in that the special stop signal prevents the introduction of a further weft thread up to the start signal.

4. The method according to claim 1, characterized in that the goods take-off device and optionally the warp let-off device is reset by a reset size G, in particular for the purpose of troubleshooting, wherein

G = K x L

is, mean:

L length of goods between two weft threads K correction factor, where K = 0.1 to 4.

5. The method according to claim 1, characterized in that the special stop signal is the error signal of a warp stop motion.

6. Loom for carrying out the method according to claim 1, with a shedding device (6), with a control device (12), with a warp let-off device (2) and a goods take-off device (4) and with a transmitter (112, SS) for Special stop signal, and means connected to the special stop signal transmitter for stopping and returning the weaving machine to a crossover point (142), characterized in that the shedding device (6) can be controlled by the control device (12), the latter being electronic and a process computer ( R) and memory (WS, HS) for a weaving program and an auxiliary program responding to a special stop signal for switching a weaving program step and the specialist image device (6) to the inverse weave.