EP0723040B1 - Shedding mechanism and method for controlling a three stands jacquard machine - Google Patents

Description

The invention relates to a shedding device for a jacquard machine with three defined specialist positions or a method for controlling a jacquard machine three defined specialist positions according to the preambles of claim 1 and 13 respectively.

Jacquard machines with three defined positions (lower, middle, upper) are used especially for the production of plush carpets or double jacquard carpets needed.

For example, Fig. 7 shows the weave scheme of a patterned double jacquard rug in the version as a two-layer woven three-shot carpet. For The manufacture of such a jacquard double carpet must be the shedding device of the Jacquard machine can provide three defined positions for the warp threads namely the lower compartment, the middle compartment and the upper compartment, in the corresponding weft threads f, g and h can be shot.

In the case of the double carpet shown, two base fabrics a, b with a distance equal to twice the pile height of a carpet woven together, connected by pile warp threads i. The weft loops of the pile warp threads i are cut by the knife j between the two base fabrics a, b and the two basic fabrics a, b are thus separated. It can be seen that the three defined Specialist positions can be controlled synchronously for the two basic fabrics a, b.

A classic example is a control of a jacquard machine in which two Boards are connected via a common roller train at the lower end, the Depending on the control, circuit boards usually with two constantly opposing moving lifting knives can be coupled, whereby the roller train and the associated warp thread one controlled lifting movement is issued. In such a jacquard machine with movable Lifting knives must be able to position the lifting knives on each board, the intervention between this board and the associated lifting knife is pattern-controlled loosen or not and also restore to achieve a desired jacquard pattern to be able to. Conventional are needleworks, which are in one position, on the board and associated lifting knife are disengaged, the board from the path of movement Move the lifting knife out so that the next time the lifting knife moves, it will turn on the board controlled in this way is moved past and does not take it along. This so-called Reading can not only be done mechanically, but, as with modern machines usual, also take place by electromagnetic means, namely that a Electromagnet in one of its excited states serves to deflect the board and to keep in the deflected state (driven state) while in the other Excitation no deflection occurs and the lifting knife take the board with it can. It is only important to give the roller train a movement and also the To move boards relative to a control device so that the pattern Control is possible. With classic electronic roller tractors Control devices are, however, with a lifting unit consisting of two lifting knives and two boards only two defined positions possible.

In order to create a shedding device with three defined shots, usually two lifting units with each other via an additional deflection roller connected, d. that is, four to achieve three defined specialist positions Sinkers and four lifting knives per warp thread are required. It can be seen that thereby the space and energy requirements, the heat development and the mechanical Effort significantly increase or the effective number of lifting devices through the Connection of two lifting units is halved. The disadvantages mentioned are in the Use of the known shedding device for producing a Jacqard double carpet even more important, since as explained above for the production of a Double carpets of three compartments are required for two basic fabrics, what for has already resulted in complex mechanics. After all, at such a high mechanical and control engineering effort also with high error rate and high Default rate to be expected.

FR-A-1 050 774 is a shedding device for a single-stroke jacquard machine with three defined specialist positions according to the generic term of independent claims known. However, this well-known shedding device is also used the space and energy requirements of the control device and the corresponding mechanical effort very high.

Based on this, it is an object of the present invention to provide a shedding device and a method for controlling a single-stroke shedding device of to develop the above-mentioned type so that with a simple mechanical structure a safer and more economical operation is possible.

The object is solved by the characterizing features of claims 1 and 13, respectively. The invention is further developed by the features of the subclaims.

The invention is based on the knowledge that small changes from a Double-stroke machine with two specialist positions, a single-stroke machine with three positions can be created. At the expense of a more complex control at a Shed forming device can thus also achieve three defined shots, if only two boards are used per lifting device and thus the mechanical effort is significantly reduced. It is crucial that the Control device is designed so that it pattern-controlled either none, one or deflects both boards. In contrast, in the known devices there are either none or both boards can be deflected. The mechanical effort is therefore unexpected Way in the device or the method about the same size as for one Shed forming device for two defined shots or a method for their Control. The anticipated problems with the more complicated control of the Shedding devices are surprisingly easily solved according to the invention.

The deflection of either one, none or both boards is according to the Invention by a quasi-synchronization with a small time offset of the opening and Movement of the two boards together with one corresponding to the time offset Activation of a control device containing a control element is achieved.

Fig. 1a-1c

schematisch eine grundsätzliche Ausführungsform einer erfindungsgemäßen Fachbilde-Vorrichtung,

Fig. 2a, 2b

detailliert eine Steuervorrichtung einer erfindungsgemäßen Fachbilde-Vorrichtung gemäß einem ersten Ausführungsbeispiel,

Fig. 3a-3c

schematisch die Erregungszustände einer Ansteuervorrichtung bei dem ersten Ausführungsbeispiel,

Fig. 4

detailliert eine weitere Steuervorrichtung einer erfindungsgemäßen Fachbilde-Vorrichtung gemäß einem weiteren Ausführungsbeispiel,

Fig. 5

ein Zeitverlaufsdiagramm der Bewegung der Kettfäden bei einer Fachbilde-Vorrichtung gemäß dem ersten oder dem zweiten Ausführungsbeispiel,

Fig. 6a,b

Zeitverlaufsdiagramme der Bewegung der Kettfäden und Fachbildevorrichtungen gemäß besonders vorteilhaften Ausführungsformen der Erfindung, und

Fig. 7

ein Bindungsschema eines Jacquard-Doppelteppichs.

The invention is explained on the basis of the exemplary embodiments shown in the drawing. Show it:

1a-1c

schematically a basic embodiment of a shedding device according to the invention,

2a, 2b

a control device of a shedding device according to the invention according to a first embodiment in detail,

3a-3c

schematically the excitation states of a control device in the first embodiment,

Fig. 4

in detail another control device of a shedding device according to the invention according to a further embodiment,

Fig. 5

FIG. 2 shows a time course diagram of the movement of the warp threads in a shedding device according to the first or the second exemplary embodiment,

6a, b

Timing diagrams of the movement of the warp threads and shedding devices according to particularly advantageous embodiments of the invention, and

Fig. 7

a weave scheme of a double jacquard rug.

1a, two boards 1 and 2 are on a common roller train 3 connected lower end together. Each board 1, 2 is a lifting knife 4 or 5 assigned, which in the usual way between a superscript H and a subscript T. are movable. With the roller train 3, a warp thread 6 is connected in the usual way issued a controlled lifting movement by the up and down movement of the roller train 3 becomes. The boards 1, 2 are in guides for linear movement between Superscripts H and subscripts T. The two by the roller train 3 interconnected boards 1 and 2 assigned a control device 7, the advantageously as shown schematically between the paths of movement of the two boards 1,2 is arranged. However, the control device 7 can also be in any other position be provided with respect to the two boards 1,2, it is essential that the sample Control can take place.

Each board 1, 2 has a nose 8 or 9, which protrudes from the respective board 1, 2. If the control device 7 is activated, the corresponding circuit board is activated by the Control device 7 deflected and the lifting knife 4 or 5 goes with its lifting movement over without grasping the nose 8 of the circuit board 1 and thus taking the circuit board 1 with it can. The circuit board 1 therefore remains in its lower position T. If the control device 7 on the other hand, in the other control state, ie "not controlled", the associated one goes Board 1 or 2 z. B. due to a spring force back to the position in which the associated lifting knife 4 or 5 can grip it via the nose 8, 9 or steer it PCB not out.

The basic principle of the present invention can be seen from FIGS. 1a to 1c. In Fig. 1a are both boards 1 and 2 controlled by the control device 7 so that they are in are in a position in which they cannot be gripped by the lifting knives 4, 5. With the upward movement of the associated lifting knives 4 and 5, the plates 1, 2 therefore not taken with you, d. H. they remain in their subscript. At this Activation of the control device 7 thus becomes the lowest position of the roller train 3 controlled, and the associated warp thread 6 is in its lowest adjustable Position, the sub-subject UF.

In the state shown in Fig. 1b, the control device 7 is so due to the Forming Jacqard pattern that a board 1 of the two boards 1, 2 in such a position that it is associated with the upward movement of the Hubmessers 4 is gripped by this and thus by the upward movement of this Lifting knife 4 is pulled up. In this control of the control device 7 is Meanwhile, the other board 2 of the two boards 1, 2 in the position shown in Fig. 1b and is therefore by the associated lifting knife 5 when it moves upwards not taken along and therefore remains in its low position.

As a result, the roller train 3 and thus the associated warp thread 6 becomes one 2a slightly raised position compared to the position of FIG. 2a, the so-called Middle compartment MF.

In contrast, in FIG. 1c the control device 7 is controlled so that both boards 1 and 2 were brought into a position by the control device 7, in which they were in the Upward movement of the two lifting knives 4 and 5, respectively, in their upper position are taken away. As a result, the roller train is 3 and thus the associated warp thread 6 brought into a still further raised position, which is still further above that in Fig. 1b shown position and thus represents the so-called upper subject OF.

As shown in FIGS. 1a to 1c, a lifting unit consisting of two can thus be used Boards and two stroke knives and a control device three defined Reach specialist positions UF, MF, and OF.

In the following, a first exemplary embodiment of a control device is to be referred to on Figures 2a and 2b in connection with those shown in Figures 3a-3c Excitation states of the control device are explained.

In FIG. 2a, the control device 7 has a single control element for both boards 1 and 2, which is in the form of an electromagnet 10. This Electromagnet 10 can, for example, also be designed as a pivotable electromagnet be as described in DE-A-37 13 832.

As can be seen from FIGS. 2a and b, the lifting knives 4, 5 move by one Stroke offset, which corresponds to a time offset T, offset up and down to each other. The Control device 7 can be controlled in accordance with this time offset T. The dimensioning of the Time offset T is explained below.

When the electromagnet 10 is in the energized state for periods t1 (Fig.3a) ER (controlled), in which both the lifting knife 5 on the nose 9 of the one assigned to it Board 2, as well as the lifting knife 4 on the nose 8 of the board 1 assigned to it The course of their upward movement offset by the time offset T both boards 1, 2 in such a position that they do not match the associated one Lifting knife 4 or 5 can engage and thus remain in their respective Subscript. This first control state thus corresponds to that shown in FIG. 1a Situation. The associated warp thread 6 is therefore in the sub-compartment UF.

In Fig. 2b, the electromagnet 10 has been in the excited state ER until the Lift knife 5 on the nose 9 of the associated board 2 in the course of its stroke (upward) movement is passed, the lifting knife 5 due to the excitation ER of Electromagnet 10 could not engage with the board 2 assigned to it. After a time period t1 (FIG. 3b) that is less than the time offset T, but greater than zero the electromagnet 10 is de-energized, which represents the second control state EN. The Board 1 is therefore e.g. due to their own spring preload in a position in who can engage with the associated lifting knife 4. The board 1 will thus in this control state by the upward movement of the lifting knife 4 in their upper position pulled. As a result, the roller train 3 and the associated warp thread 6 around half of the stroke distance, which is caused by the height difference between the Superscript H and the subscript T of the board 2 is fixed.

As a result, the two boards 1, 2 are at the end of the upward movement of both Lift knives 4 and 5 in a position corresponding to the situation shown in Fig. 1b. The associated warp thread 6 is thus in this control of Control device 7 in the middle compartment MF.

In the event that the electromagnet 10 is in the de-excitation state before the Lifting knife 5 in the course of its lifting movement on the board 2 assigned to it is passed, the lifting knife 5 engages with the board 2 and is by the Lifting movement of the lifting knife 5 is pulled upwards. If the electromagnet 10 during a time period t2 (FIG. 3c) which is greater than the time offset T in this deenergized control state EN remains, the other board 1 at the time of Passing the lifting knife 4 assigned to it also in a position in which it is connected the lifting knife 4 engages and is pulled upwards by its upward movement becomes.

As a result, the two boards 1, 2 are at the end of the upward movements of the two lifting knives 4, 5 in a position corresponding to the situation shown in FIG. 1c corresponds. The associated warp thread 6 is thus by lifting the Associated roller train 3 in the last described control of the electromagnet 10 in the upper subject OF.

As shown in detail in Fig. 5, the movement of the roller train 3 (see also. Fig.1) and thus the associated warp thread 6 (Fig. 5a) from the superposition of the the time offset T offset movements of the two lifting knives 4 and 5 (Fig. 5b). How 5a and 5b, the upper compartment OF is formed over a period of time, which essentially between reaching the top dead center of the lifting knife 5 and the reaching of the top dead center of the lifting knife 4 and thus essentially corresponds to the time offset T. As, however, also in Fig. 5b by the hatched Area is shown, the ideal state d. H. Maximum stroke value at which no Delay occurs (but only with separate control of the boards with respect to the both lifting knives 4 and 5 is possible) from the lifting value of the warp thread 6 that can actually be achieved significantly, and the greater the time offset T (in extreme cases these movements even cancel each other out). It can thus be seen that with regard to the time offset T a compromise between the time duration of the Obviously OF and a sufficient level difference between the respective Specializations UF, MF, OF must be found.

When choosing the time offset T it should also be borne in mind that when a board position to be achieved, the sub-specialist position UF or the middle specialist position MF corresponds to the lifting knife 5 at the time of de-energization of the electromagnet 10 to deflect the circuit board 1 already on the nose of the now also deflected Board 2 is pulled over and the board 2 is thus safely out of engagement with the Lift knife 5 remains.

The time offset T is thus also to be selected such that when one of the circuit boards is activated 2 control of the other circuit board 1 can be safely avoided.

In the embodiment shown in Figure 4 a detail of an inventive Fachbilde device, the control device 7 has two separately controllable Controls that are each assigned to one of the boards 1,2. In the illustrated Embodiment, the two controls are advantageous in the form of Electromagnet 11.12 executed.

The two electromagnets 11, 12 are spatially separated by a partition 13 magnetically shielded to prevent mutual interference between the two electromagnets 11.12 to prevent. The two electromagnets 11, 12 can be used independently of one another can be controlled in the de-energized or excited state. So it is it can be seen that depending on the control of the two independent electromagnets 11, 12 pattern-controlled none, one or both boards 1, 2 can be deflected without there is a time offset T of the up and down movements of the plates 1, 2 and their Control requires.

Due to the independent control (excitation) of both electromagnets 11, 12 thus both boards 1,2 are brought into such a position that they with the Lifting knives 4 or 5 cannot engage and therefore during the upward movement the lifting knife 4.5 remain in their respective lower position. As a result of Activation of both electromagnets 11, 12 is the associated warp thread 6 in the Sub-subject UF.

By actuating (excitation) one of the electromagnets 11, 12, one of the boards can 1,2 are deflected into such a position that they with the associated lifting knife 4 or 5 can engage and thus by the upward movement of this Lifting knife is pulled up into its raised position while the other of the two Boards 2,1 by de-excitation of the electromagnet 12 or 11 in assigned to them their subscript remains. As a result, the associated warp thread 6 is in the Middle subject.

If the two electromagnets 11, 12 are controlled so that they are both de-excited, both boards are e.g. due to their own spring force in one such a position that they both engage with their associated lifting knives 4, 5 and are pulled upwards into their respective high positions by their lifting movement. As a result, the associated warp thread 6 is in the upper compartment OF.

When actuated with the aid of electromagnets, a known offer can be made take place in which the respective circuit board mechanically at a short distance from or in System is brought to the electromagnet and not mechanically back into the deflected position is brought when their control by excitation of the Electromagnet takes place, in which case the associated lifting knife (again) takes along (see also DE-A-37 13 832).

Finally, the control can in principle also be carried out in any other conventional manner Way done - for example by means of needleworks or the like.

A particularly advantageous embodiment of the invention is shown in Fig. 6a, b.

As shown in Fig. 6a, the warp thread 6 'at one end of the roller pull cord a second roller train 15 instead of being directly connected to the roller train 3. The second end of the roller pull cord of the second roller pull 15 is firmly attached to one Frame R attached. The result is a machine with a high level of operation, i.e. The control of the boards 1, 2 (reading in E) takes place in the sub-compartment position UF. At If desired, the middle and upper compartment MF, OF are moved to each shot (controlled). After that, the reader is returned to the reading position (= sub-compartment UF) returned. This has the disadvantage that the path from the reading position E to the upper compartment position OF is twice as far as the distance from the reading position E to the middle compartment position MF.

A particularly elegant solution to this problem is shown in Fig. 6b. At this Embodiment is the frame R on which the fixed end of the roller cord of the second roller train 15 is attached, movable between two height bearings and leads in Fig.6b shown up and down movement. Reading E thus takes place in the Middle compartment position MF. The upper or lower subject OF or UF are therefore by a single stroke movement in contrast to the double stroke movement of the embodiment to reach from Fig. 6a. The movement of the warp thread 6 'is therefore less.

For the excitation of the electromagnet 10 for the sub-compartment UF explained with reference to FIG. 3a it is not absolutely necessary to have two excitation pulses which are offset by the time offset T are staggered to provide. Rather, it is sufficient if, as by a semicolon shown in Fig. 3a, the electromagnet 10 during the period in the excited state ER is in which both the lifting knife 5 and the lifting knife 4 on the respective Pull circuit boards 1 and 2 over. In the same way, it is not mandatory for the middle compartment MF (see. Fig. 3b and Fig. 4) exclusively the board 1 that the Lift knife 4 is assigned to control. Rather, it can alternatively be taken for granted also the board 2, which is assigned to the lifting knife 5, can be controlled (not in shown individually).

In principle, the basic idea of the invention can also be applied if the Activation (reading) takes place in the area of the top dead center position of the lifting knives. It is merely (mechanically) in a manner known per se to ensure that the two Positions of the boards are guaranteed without the tensile stress caused by the The warp 6 of the standing plate falls back down.

Claims (24)

1. Shedding device for a single-lift Jacquard machine having three defined shed positions (UF, MF, OF), in which two hooks (1, 2), connected at one end via a common pulley block, are moveable by means of a lifting knife arrangement (4, 5) between an upper and a lower position, and a control device (7), controllable on the basis of the pattern to be formed, is so associated with the paths of movement of the two hooks (1, 2) that in a first control condition (ER) one of the hooks (1, 2) is deflectable into a disposition in which no movement of this hook (1, 2) is possible, whilst in a disposition corresponding to a further control condition (EN) the respective hook (1, 2) is moveable, whereby for the attainment of the three shed positions (UF, MF, OF) the control device (7) is so constituted that it deflects, selectively controlled by the pattern, none, one or both hooks (1, 2),
   characterised in that,
   the upward and downward movements of the two hooks (1, 2) are temporally offset to one another by a small but finite value (T) and the control device (7) is controllable corresponding to the temporal offset (T).
2. Device according to claim 1,
   characterised in that,
   the control device (7) is provided between the movement paths of the hooks (1, 2).
3. Device according to any preceding claim,
   characterised in that,
   the control device (7) has a single control element (10) for both hooks (1, 2) and this is controllable temporally offset for each one of the hooks (1, 2).
4. Device according to any preceding claim,
   characterised in that,
   the temporal offset (T) is as small as possible, but is greater than zero.
5. Device according to claim 4,
   characterised in that,
   the temporal offset (T) is so determined that upon controlling of one of the hooks (1, 2) controlling of the respective other hook (1, 2) is reliably avoided.
6. Device according to any preceding claim,
   characterised in that,
   the control device (7) has separately controllable control elements (11, 12) associated each with one of the hooks.
7. Device according to any preceding claim,
   characterised in that,
   the control device (7) deflects the hooks (1, 2) on an electromagnetic basis.
8. Device according to any of claims 1 to 6,
   characterised in that,
   the control device (7) deflects the hooks (1, 2) mechanically.
9. Device according to any preceding claim,
   characterised in that,
   the device is provided in a double-sided carpet weaving machine.
10. Device according to any of claims 1 to 8,
    characterised in that,
    the device is provided in a weaving machine for plush carpets.
11. Device according to any preceding claim,
    characterised in that,
    a second pulley block (15) is connected with the first pulley block (3), whereby a warp thread (6') is associated with the pulley block cord of the second pulley block (15).
12. Device according to claim 11,
    characterised in that,
    one end of the pulley block cord of the second pulley block (15) is fixedly attached to a frame (R), whereby the frame (R) is moveable corresponding to the upward and downward movements of the two hooks (1, 2).
13. Method for controlling a single-lift Jacquard machine having three defined shed positions (UF, MF, OF), in which two hooks (1, 2), connected at one end via a common pulley block (3), are moved by means of a lifting knife arrangement (4, 5) each between an upper and a lower position, and a control device (7), controlled on the basis of the pattern to be formed, in a first control condition (ER) deflects one of the hooks into a disposition in which no movement of this hook is possible, whereas in the disposition corresponding to a further control condition (EN) the respective hook can be moved, whereby for attainment of the three shed positions (UF, MF, OF) the control device (7) deflects, selectively controlled by the pattern, none, one or both hooks (1, 2),
    characterised in that,
    the two hooks move upwardly and downwardly temporally offset to one another by a small but finite value (T) and the control device (7) is controlled in correspondence to the temporal offset (T).
14. Device according to claim 13,
    characterised in that,
    the control device (7) has a single control element (10) for both hooks (1, 2) and this is controlled temporally offset for each one of the hooks.
15. Method according to claim 14,
    characterised in that,
    the temporal offset (T) is set as small as possible, but greater than zero.
16. Method according to claim 15,
    characterised in that,
    the temporal offset (T) is so set that upon controlling of one of the hooks (1, 2) a controlling of the respective other hook (1, 2) is reliably avoided.
17. Method according to any of claims 13 to 16,
    characterised in that,
    respective control elements (11, 12) of the control device (7) associated each with one of the hooks (1, 2) are separately controlled.
18. Method according to any of claims 13 to 17,
    characterised in that,
    the control device (7) deflects the hooks (1, 2) on an electromagnetic basis.
19. Method according to any of claims 13 to 17,
    characterised in that,
    the control device (7) deflects the hooks (1, 2) mechanically.
20. Method according to any of claims 13 to 19,
    characterised in that,
    the device is employed in a double-sided carpet weaving machine.
21. Method according to any of claims 13 to 19,
    characterised in that,
    the device is employed in a weaving machine for plush carpets.
22. Method according to any of claims 13 to 21,
    characterised in that,
    a warp thread (6') is moved over a second pulley block (15) which is connected with the first pulley block (3).
23. Method according to claim 22,
    characterised in that,
    a frame (R) at which a second end of the pulley block cord of the second pulley block (15) is applied, is moved upwardly and downwardly.
24. Method according to claim 23,
    characterised in that,
    the frame (3) is moved in correspondence to the upward and downward movements of the hooks (1, 2) such that the deflection of the hooks (1, 2) into the middle shed position (MF) occurs.

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