EP0036482B1 - Double-lift jacquard of open-shed type - Google Patents

Abstract

1. Double stroke open shed jacquard machine with lifters which have three projections, are guided with play at at least one stationary screen, arranged between the lifting griffs, which do not intersect one another, and are supported in their lower shed position on the lifter base, wherein one lifting griff box, preferably the lower one, is guided in the contact region of the lifters such that it moves laterally, characterized in that the lifters (1) are constructed with one arm, are secured against rotation about their axis and their projections (2, 3), associated with the lifting griffs (6, 7) are directed towards opposite sides, the lifters (1) being supported in the impressing direction of the needles, on the screen (9) disposed between the lifting griffs (6, 7) whilst avoiding a further screen arranged below the lifting griffs (6, 7) and an additional screen (12) being provided above the open shed position of the upper lifting griff (6).

Description

introduction

A double-stroke open-compartment jacquard machine is a shedding device for weaving machines that enables irregular patterns to be woven. The sinkers intended for raising and lowering the warp threads are taken along by reciprocating lifting knife boxes, for which purpose the sinkers are provided with lugs for hanging on the cutting edges of the lifting knives. The boards are controlled by needles extending transversely to them when the lifting knives are in their stroke end positions. If a board is to remain in the upper compartment, it is supported with a nose on a locking knife and therefore cannot follow the lifting knife. If a circuit board is to remain in the lower compartment, it is supported on the circuit board base, and the needle must push the circuit board off the associated lifting knife in order to avoid taking the circuit board with it.

If the sinkers hanging on the descending lifting knife meet with the ascending lifting knife, there is a risk that the lifting knife rising will catch the free hook of the descending sinker and unwantedly move it back into the upper compartment position, which leads to weaving errors.

The basic object of the invention is to avoid this undesirable entrainment of descending boards by ascending lifting knives.

State of the art

With the subject matter of DE-PS 2 344 363, this basic object is achieved in that one of the two lifting knives in the crossover area of the plates laterally deviates from its predetermined vertical movement path. The descending boards can therefore no longer be detected by the ascending lifting knife due to this lateral evasion path.

In this known arrangement, the lifting knives are spaced from each other so that they do not cross each other during their lifting movement. The boards are double-legged, one leg acting as a resilient support leg and the other leg being provided with three lugs which point in the same direction, of which two lugs are assigned to the lifting knives and one lug to the locking knife.

Platinum grids are arranged between the lifting knife sets and below the lower lifting knife set, which limit the freedom of movement of the boards in the direction of impression of the needles.

The lateral evasive movement of the one lifting knife box thus has the result that the circuit boards hanging thereon are supported on the circuit board gratings, while the area of the circuit board located between them is bulged, ie deformed, by the laterally evading lifting knife. This deformation of the boards leads to the fact that the board leg located above the board grids with the free hook attached to them is brought out of the effective range of the ascending knife.

The consequence of this lateral evasive movement of the one set of lifting knives is, however, a much greater friction of the boards on the board grids, which can even lead to the boards being taken along with the downward lifting knife becoming stuck as a result of this friction, losing contact with the lifting knife and thus to weaving errors To give reason.

Special object of the invention

Based on the basic task mentioned at the outset, the special object of the invention is to avoid the disadvantages of the construction according to DE-PS 2344363, by supporting the boards on board grids with the consequence of the board bending by a different design of the boards and arrangement of the board grids is avoided if one of the lifting knife boxes executes a lateral evasive movement.

Solution according to the invention

The invention is based on DE-PS 2 344 363 in that the lifting knife boxes are spaced apart from one another, i.e. they do not cross, one of the knife boxes, preferably the one below, executes a lateral evasive movement in the crossing area of the plates and thus the unwanted taking of the descending ones Board prevented by the ascending lifting knife. A board grate is arranged between the knife boxes, on which the boards are guided with the possibility of evasion in the impression direction of the needles.

In addition to these known features, according to the invention the plates are formed in one leg, secured against rotation about their axis and their lugs assigned to the lifting knives are directed towards opposite sides, the plates in the impression direction of the needles on the grating arranged between the lifting knives, avoiding another, below the Lifting knife arranged grate are supported and an additional grate is provided above the open compartment position of the upper lifting knife.

Effect and advantage of the invention

It has been shown that the sinkers detach themselves from the grate located between the knife cases when the side-deflecting knife box descends and perform a kind of tilting process without bending the plate, which is only determined by this lateral deflection movement and the harness pull. The grate located above the knife boxes in the subject of the invention no longer has any frictional contact with the outgoing boards and therefore fails as a source of friction. Since there is no rust underneath the knife boxes, no friction can occur at this point either.

Further features of the invention emerge from the subclaims.

• Fig. 1 eine Seitenansicht einer Doppelhub-Offenfach-Jacquardmaschine mit Darstellung verschiedener Platinenstellungen,
• Fig.2 bis 9 Seitenansichten jeweils einer Platine in verschiedenen Bewegungsstellungen,
• Fig.10 eine konstruktive Darstellung einer Platine,
• Fig. 11 eine Variante des oberen Rostes mit Führungselementen und
• Fig. 12 eine Platine in einer anderen Ausgestaltung.

In the drawing, the invention is shown schematically and for example. It shows

• 1 is a side view of a double-stroke open-pocket jacquard machine showing different board positions,
• 2 to 9 side views of a circuit board in different movement positions,
• 10 shows a constructive representation of a circuit board,
• Fig. 11 shows a variant of the upper grate with guide elements and
• Fig. 12 is a circuit board in another embodiment.

In Fig. 1, a double-stroke open pocket jacquard machine according to the invention is shown in an overall view. It has two groups of lifting knives 6, 7 which can be reciprocated in the vertical direction and which are so far apart from one another that they do not cross. With these lifting knives 6, 7 boards 1 are moved vertically, which in turn are adjustable by impression needles 5 transversely to their longitudinal axis, so that the lugs 2, 3 located on the single-bar boards 1 and projecting in opposite directions in or out of engagement with the knife edges of the Lifting knife 6, 7 can be brought. Each board 1 also has a locking lug 4 which can cooperate with a fixed locking knife 8 in the upper compartment position of the board 1.

The impression needles 5 are moved laterally by impression knives 17 acting horizontally against the action of springs, not shown. There are driver elements 17 on the impression needles 5, which strike against the boards 1 assigned to them and can press them laterally from the lifting knives 6, 7. The stylus needles 19 are connected to the impression needles 5 and act against the jacquard cards 21, which are guided in the usual manner via a cylinder 20. If a stylus 19 hits a hole in the card 21, it brings the imprint needle 5 assigned to it out of the range of action of the imprint knife 17. The consequence of this is that the assigned board 1 remains in its basic position, that is to say it is not pressed. If, on the other hand, the stylus 19 hits the card 21, the impression meter 17 shifts the associated impression needle 5 and thus also the associated circuit board 1.

In Fig. 1, the upper lifting knife 6 is shown in its upper and the lower lifting knife 7 in its lower stroke end position. The boards 1a are located in the sub-compartment and are not pushed off to the side. Consequently, they are taken up with the lifting knife 7. The boards 1 are located in the upper compartment and are also not pulled off. Consequently, they would go down with the lifting knife 6, but they are prevented from doing so by being supported on the locking knife 8.

The boards 1c are located in the upper compartment and are pushed off to the side. Since they hang with the lugs 2 on the lifting knife 6, the locking lug 4 is released from the locking knife 8. Consequently, these boards 1 c go with the lifting knife 6 in the sub-position.

The boards 1 d are in the sub-compartment and are pressed. As a result, the nose 3 is released from the lifting knife 7, from which it follows that the boards 1d remain in the sub-compartment position.

Between the lifting knives 6, 7 there is a grate 9, on which the boards 1 are guided in their basic position and support them when they are pressed. The boards 1 located in the lower compartment are seated on a board bottom 10. In the area of the upper stroke end position of the upper stroke knife 6, a second grate 12 is provided, the function of which is described in more detail in the following figures. If the boards 1c located in the upper compartment are pressed briefly and thus follow the lifting knife 6 into the lower compartment position, the ascending lifting knife 7 and the free nose 3 of the descending board 1c meet, which would result in this board 1c being halfway up Path is captured and taken back to the upper compartment. This would make a weaving mistake inevitable. In order to avoid this weaving error, one of the lifting knives 6, 7, preferably the lower lifting knife 7, executes a lateral evasive movement along the arrow 13 when the free nose 3 is about to pass the lifting knife 7 rising upwards. Gearboxes for such avoidable knives are known, so that a constructive representation is unnecessary.

2 to 9 show the different positions of the boards 1 as a function of the reading process.

In the example of FIGS. 2 and 3, the boards 1 are in the down position. The corresponding needles 5 have not been pushed away laterally, and consequently the lower lifting knives 7, the board 1 in the case of Fig. 2 in the open compartment _t will take RECOVERY. In the case of FIG. 3, the lifting knives 6, 7 have their other lifting ends Position reached compared to Fig. 2, so that the upper knife 6 takes the board 1 in the open compartment position. In both cases, the plate 1 is properly centered in that it rests on the grate bar 9 facing the nose 2 and possibly on the locking knife 8 and is held in this position by the tensile force of the harness thread.

If, however, in the case of FIG. 4 in a position like FIG. 2, the circuit board 1 is laterally pressed off by the needle 5, it is subject to a combined bending and tilting stress, counterclockwise around the grate 9, whereby the middle nose 3 from rising Lift knife 7 is released. If the upper part of the board is stiffened and the lower part of the board is soft, then the board 1 more tilts around the supporting grate 9 in the upper area and more bends in the lower area.

The printed circuit board 1 shown in FIG. 4 thus remains in the sub-compartment position as in the example in FIG. 5, which corresponds to the position of the lifting knives 6, 7 in accordance with FIG. 3. It can be seen from FIG. 5 that the tilting movement of the circuit board 1 must assume such an angular dimension that the upper nose 2 closest to the grate 9 is clearly distanced from the plane of movement of the lifting knife 6.

In the example of FIG. 6, the circuit board 1 is in the open compartment position and sits with its nose 4 on the locking knife 8. It is not fired, so it remains in the open position. Here, too, the circuit board is properly guided and centered between the grate 9 and the locking knife 8.

If, however, the circuit board 1 in the open compartment position is pressed laterally according to FIG. 7, a combined bending and tilting process takes place around the right grate bar 9 until the locking lug 4 is released from the locking knife 8. So that the upper end of the board cannot slide off the upper lifting knife 6, the upper grate 12 is important for its function, because it blocks the tilting movement of the board 1 in the upper part.

However, this support can only occur if the board hanging on the upper lifting knife 6 has reached the open compartment position. Suitable guide means 14 are provided so that the boards 1 can get into the position between the grate bars 12 without resistance or blockage, which in the example of FIGS. 2 to 9 consist of a slightly angled board extension.

The same effect also results if the circuit board 1 is seated on the lower lifting knife 7 according to FIG. 8 and is pressed off.

In the example of FIG. 9, it is now shown how the circuit board 1 going down with a lifting knife 7 is prevented from catching its free nose 2 by the lifting knife 6 going up. In the example of FIG. 9, the lower lifting knife 7 regularly executes a lateral evasive movement, as indicated by the arrow 13, while passing through its middle lifting area. The hanging board 1 is taken from the dashed position into an inclined position so that its nose 2 is released from the knife 6. This movement of the board takes place without deformation because it detaches itself from the grate 9 by the lateral entrainment of the knife 7 and has already got out of the upper grate 12. Only the tension of the harness thread causes a slight deflection in the lower region of the plate 1, which is flexible, especially when it comes to rest on the locking knife 8. If the circuit board 1 hangs on the upper knife 6, the evasive movement of the lower knife 7 does not lead to any deformation at all.

In the example in FIG. 10, a single circuit board 1 is shown in a constructive representation. In the upper part, a stiffener 11 in the form of a wire is attached to the circuit board 1, for. B. welded, in a plane parallel to the needles 5. This stiffening also provides a turnstile for the board, in connection with the usual guide rods that extend parallel to the needles 5.

In the example, the stiffening 11 carries the upper nose 2. A part of the board 1 protruding beyond the nose 2 is slightly angled and forms a guide means 14 for easier insertion of the board 1 into the grate 12.

However, according to FIG. 11, the Ru _G t 12 can also be provided with guide means 14 which can even protrude down to below the nose 2 of the boards located in the sub-compartment position.

In the exemplary embodiment in FIG. 12, a circuit board 1 provided with an offset 15 is shown, which extends in the printing direction of the needles 5. The type of bend 15 is selected so that the circuit board 1 in the sub-compartment position (cf. FIG. 4) is influenced by the needles 5 at a point above the bend 15. A board 1 in the upper compartment position (cf. FIG. 7), however, is influenced by the needles 5 below the offset 15. In this position, the needle 5 initially performs an idle stroke by the amount of the offset 15 and only then hits the bent leg 16. Despite the needles 5 arranged in several layers one above the other, the plates 1 with their offset 15 need not be adapted to each needle position . However, these offsets 15 are also an anti-rotation device for the circuit board 1.

Claims (7)

1. Double stroke open shed jacquard machine with lifters which have three projections, are guided with play at at least one stationary screen, arranged between the lifting griffs, which do not intersect one another, and are supported in their lower shed position on the lifter base, wherein one lifting griff box, preferably the lower one, is guided in the contact region of the lifters such that it moves laterally, characterized in that the lifters (1) are constructed with one arm, are secured against rotation about their axis and their projections (2, 3), associated with the lifting griffs (6; 7) are directed towards opposite sides, the lifters (1) being supported in the impressing direction of the needles, on the screen (9) disposed between the lifting griffs (6, 7) whilst avoiding a further screen arranged below the lifting griffs (6, 7) and an additional screen (12) being provided above the open shed position of the upper lifting griff (6).

2. Double-stroke open-shed jacquard machine as claimed in claim 1, characterized in that the lifters (1) are constructed such that they are reinforced in the region of the projections (2, 3) associated with the lifting griffs (6, 7) and flexible in the lower region.

3. Double-stroke open-shed jacquard machine as claimed in claim 2, characterized in that the reinforcement of the lifters (1) is formed by a welded-on wire (11) which is also used as a rotational block and is connected to the lifter (1) in a plane which is parallel to the needles (5).

4. Double-stroke open-shed jacquard machine as claimed in claim 1, characterized in that the additional screen (12) and/or the lifters (1) comprise guide means (14) for leading the rising lifters (1) into the support position on the screen (12).

5. Double-stroke open-shed jacquard machine as claimed in claim 1, characterized in that the lifter (1) comprises a bend (15) extending in the impressing direction of the needles (5), in the effective region of the needles (5), and as a result the lower arm (16) is laterally offset with respect to the upper arm.

6. Double-stroke open-shed jacquard machine as claimed in claim 5, characterized in that the lateral offset of the lower arm (16) is formed as a rotational block.

7. Double-stroke open-shed jacquard machine as claimed in claim 5 or 6, characterized in that the location of the bend (15) is selected such that the needles (5) influence a lifter (1) located in the lower shed above the bend (15) and a lifter (1) located in the upper shed below the bend (15).

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