CN109072506B

CN109072506B - Reed for rapier loom

Info

Publication number: CN109072506B
Application number: CN201780022665.4A
Authority: CN
Inventors: K.布鲁伊诺赫; P.加内特
Original assignee: Individual
Current assignee: Individual
Priority date: 2016-04-22
Filing date: 2017-04-21
Publication date: 2020-11-03
Anticipated expiration: 2037-04-21
Also published as: BE1024132A1; CN109072506A; WO2017182991A1; EP3445903B1; BE1024132B1; EP3445903A1

Abstract

The invention provides a reed (1) for a rapier weaving machine, the reed (1) comprising a plurality of dents (2), each dent comprising a recess (3) and/or a protrusion (4), wherein the recesses (3)/protrusions (4) of the dents (3) form a guide channel (5)/guide ribs, wherein the guide channel (5) and/or the guide ribs are used for guiding a rapier (6) through a gap, wherein at least a part of the dents (2) is arranged in a centering region (7) between an end (10) of the reed (1) and a transfer point (12), and wherein the gap in the centering region (7) decreases in a direction towards the transfer point (12) of the reed (1).

Description

Reed for rapier loom

Technical Field

The invention relates to a reed for a rapier weaving machine, comprising a plurality of dents, each of which comprises recesses and/or protrusions, wherein the recesses of the dents form guide channels and/or the protrusions of the dents form guide ribs, wherein the guide channels and/or the guide ribs are used for guiding a rapier of the rapier weaving machine through gaps.

The invention further relates to an assembly of such a reed and a rapier of a rapier weaving machine.

Furthermore, the invention relates to a rapier weaving machine comprising such an assembly.

Finally, the invention relates to an assembly of a rapier weaving machine and warp threads incorporated in a fabric with the rapier weaving machine.

The invention is particularly suitable for axminster rapier looms.

Background

Rapier looms comprise one or more rapier for introducing weft yarns in the shed between warp yarns to form a fabric. The weft yarn introduced by means of one or more rapier strikes against the already manufactured fabric by means of the reed. This process is repeated in successive weft insertion cycles to form the fabric.

A critical point in time during the introduction of a weft thread by a rapier is the moment at which the transfer device has to transfer the weft thread from the rapier. In the case of weaving looms operating according to the double rapier principle, these transfer devices can comprise, for example, second rapiers. At this time, the transfer point at which the second rapier receives the weft yarn from the first rapier is located at the center of the loom, at the center of the reed. If only one rapier carries the weft thread through the shed, the transfer point at which the transfer device receives the weft thread from the rapier is located at one end of the reed. For both types of looms, the rapier carrying the weft yarn into the shed must be positioned precisely at this transfer point to ensure correct transfer of the weft yarn. For this purpose, any second rapier receiving the weft thread must also be positioned precisely at this transfer point.

Traditionally, in this case the rapier is guided only by the warp yarns in the shed. However, as weaving speeds increase, the positioning of such rapier at the transfer point becomes increasingly imprecise.

In order to ensure that the rapier is positioned precisely at the transfer point even with an increased weaving speed, it is known from documents such as GB 2314095 a and US 5,664,609 that the reed is constructed such that it guides the rapier during its movement between the warp yarns. To this end, the reed comprises the features as described in the preamble of the first claim.

However, with these known solutions the limit has been reached in further increasing the weaving speed.

Documents GB 2265160 a and EP 0199882 a1 describe and show related reeds in which spools are guided instead of rapier. In EP 0199882 a1, a guide device is provided in addition to the reed to further guide the spool towards the braking channel of the braking device, so that the spool can be braked easily even if the braking channel is worn.

Disclosure of Invention

The object of the invention is to provide a solution for positioning the rapier at the transfer point so as to achieve an increased weaving speed.

This object of the invention is achieved by providing a reed for a rapier weaving machine, said reed comprising a plurality of dents, each dent comprising recesses and/or protrusions, wherein the recesses of the dents form a guide channel and/or the protrusions of the dents form a guide rib, wherein said guide channel and/or said guide rib is used for guiding a rapier of the rapier weaving machine through a gap, wherein at least a part of said dents is arranged in a centering region between an end of the reed and a transfer point of the reed, which transfer point is located at a reed point different from said end of the reed, and wherein the gap within said centering region decreases in a direction towards the transfer point of the reed.

For rapier looms with a single rapier, the transfer point is located at the other end of the reed. For rapier looms operating according to the double rapier principle, the transfer point is located in the center of the reed. More specifically, the transfer point can be arranged in the center of the reed.

With the solutions disclosed in GB 2314095 a and US 5,664,609, the reed must be completely stationary in order to be able to introduce the rapier into the shed. The reason for this is that the rapier, which is guided precisely relative to the reed, is moved along the entire length of the reed. In this case, the reed must be moved each time from the starting position towards the fabric in order to be able to strike the weft thread and then must be completely returned to the starting position and be stationary in the starting position in order to be able to bring the rapier into the shed by means of the reed. Only after the rapier is completely removed from the shed can the reed be moved back towards the fabric in order to hit the next weft thread. The reed must therefore be stationary in the starting position for a long time. This period of rest time is a serious obstacle to further increase the weaving speed.

With the reed according to the invention, the reed no longer has to be completely stationary during the entire movement of the rapier, since the gap is variable. After the weft thread has been beaten, the rapier may have been brought into the shed while the reed is still moving towards the starting position. The only requirement is that when the rapier in the reed reaches a position where the gap of the reed dent is minimum, the reed must be completely returned to the starting position at the end of the rapier movement to insert the weft yarn. Higher speeds can be achieved since the rapier may already be introduced into the shed while the reed is still moving.

In addition, with the reed according to the invention, the risk of warp runout in the warp direction can be limited, so that no streaks are formed in the fabric (e.g. carpet) woven using the device.

All of said dents, including recesses and/or protrusions, are preferably continuous dents of a weaving reed. However, it is also possible to alternate such dents with recesses and/or protrusions with one or more dents without such recesses and/or protrusions (e.g., conventional dents). For example, a continuous dent with recesses can also alternate with one or more dents with protrusions, and so on. This successive arrangement of the different dents can be realized in a systematic or arbitrary manner. The only important point is that these dents still together form a guide channel and/or a guide rib for guiding the rapier through the gap. When referring to successive dents having recesses and/or protrusions in the following, optionally one or more dents deviating from these dents are provided between these dents.

According to the invention, in order to reduce the gap within the centering region, in the dent having said recesses, at successive dents (between which one or more dents without recesses are optionally arranged), the respective dimensions of these recesses decrease gradually in the direction towards the transfer point, seen in the direction at right angles to the moving direction of the rapier. At this time, the respective portions of the rapier engaged in the recessed portions to guide the rapier in the guide channels formed by the recessed portions of the successive dents, as viewed in the direction, can move a large distance relative to the dents at the beginning, and, as it gradually approaches the transfer point, the distance it can move relative to the dents becomes smaller and smaller until its movement is finally prevented.

According to the invention, for the dents having said projections, at successive dents within said centering zone, the respective dimensions of these projections increase gradually towards the transfer point in a direction at right angles to the moving direction of the rapier. At this time, the respective portion of the rapier engaged with the projection to guide the rapier with the guide rib formed by the projection of the successive reed dent can still move a large distance relative to the reed dent at the beginning as seen in the direction, and the distance that it can move relative to the reed dent becomes smaller as it gradually approaches the transfer point until its movement is finally stopped.

In a preferred embodiment of the reed of the invention, a part of said dents is arranged in a transfer zone at the location of the transfer point of the reed, wherein said dimension of the recesses and/or projections for guiding the rapier remains substantially constant in this transfer zone. With such a transfer zone, in which the gap is kept substantially constant, it can be ensured that the rapier guided by such a reed is positioned particularly accurately at the transfer point, because, due to the use of such a gap, during the movement of the rapier towards the transfer point, it can be ensured that the rapier, at the last moving part before the transfer point, can no longer be moved with respect to the reed in the direction of said dimension at right angles to the direction of movement.

Such a transfer zone is preferably arranged in a position adjacent to the centering zone of the reed according to the invention.

Even without such a transfer zone, the centering zone can continue straight to the transfer point.

When the transfer point is arranged between the two ends of the reed, a part of said dents is preferably arranged in a second centering region between the other end of the reed (instead of the first-mentioned end) and the transfer point of the reed, wherein in this second centering region said dimension of the recess decreases in the direction towards the transfer point of the reed and/or said dimension of the protrusion increases in the direction towards the transfer point of the reed.

Typically, the transfer point is arranged between the two ends of the reed, wherein the second rapier receives the weft yarn supplied by the first rapier and carries it to the other end of the reed. Therefore, with the second centering section, it can be ensured that the second rapier is accurately positioned at the transfer point.

If such a reed with a second centering region also comprises the transfer region, the second centering region preferably adjoins the transfer region.

If such a reed with a second centering region does not comprise such a transfer region, this second centering region preferably adjoins the first-mentioned centering region.

Dents having such recesses and/or protrusions are generally more expensive than conventional dents. Moreover, such recesses and/or projections tend to cause the dent segments to be weakened, making them more susceptible to wear. Therefore, with the reed of the present invention, it is preferable to provide the dents without the recesses and/or the protrusions in the area beside the first-mentioned dents.

Alternatively, but less preferably, all the dents of the reed can also be designed like the dents with recesses and/or protrusions.

The object of the invention is also achieved by providing an assembly of the above-mentioned reed of the invention and a rapier for a rapier weaving machine.

If the reed dent of the reed of such an assembly comprises said recess in the first-mentioned centering region, at least a part of the rapier can preferably pass in said recess, wherein the lateral movement of the rapier is limited by the side walls of the recess.

More specifically, the assembly of the present invention may include a second rapier for a rapier loom.

The reed of such an assembly is then preferably the reed with the second centering area described above. If the reed dent of such a reed comprises said recesses in the second centering region, at least a part of the second rapier can preferably pass through the recesses within the second centering region, wherein the lateral movement of the second rapier is limited by the side walls of these recesses.

If the reed of such an assembly of the invention, which has dents with recesses in one or more centering zones, also comprises said transfer zone, the dents of the reed in the transfer zone preferably also comprise said recesses, in which case these recesses in the transfer zone preferably have a diameter corresponding to the diameter of the first-mentioned portion of the rapier which can pass through in the recesses. If the assembly comprises two rapiers, this diameter preferably also corresponds to the diameter of the part of the second rapiers that can be passed through in the recess.

The guide channel of the reed of such an assembly is preferably provided with an opening which leaves the movement of each rapier away from the reed unhindered in a direction at right angles to the direction of movement of the rapier through said recess.

In the case where the dent of the reed in the assembly of the invention comprising the recesses and/or the projections comprises said projections, each rapier is preferably provided with a recess in which said projections can at least partially protrude to guide the rapier.

If the reed of such an assembly of the invention, which has dents with protrusions in one or more centering zones, also comprises said transfer zone, the dents of the reed in the transfer zone preferably also comprise said protrusions, in which case these protrusions in the transfer zone preferably have a diameter corresponding to the diameter of the recesses in the first-mentioned rapier. If the assembly comprises two rapiers, this diameter preferably also corresponds to the diameter of the recess in the second rapiers.

The object of the invention is also achieved by providing a rapier weaving machine comprising the above-described assembly of the invention.

Further, the object of the present invention is also achieved by providing an assembly of such a rapier loom of the present invention and warp yarns incorporated in a fabric by the rapier loom, wherein the warp yarns are restricting elements for restricting the movement of the rapier in a direction away from the reed.

Alternatively, the movement of the rapier away from the reed in a direction at right angles to its direction of movement can be prevented, for example, using hook-shaped elements. However, the use of hook-shaped elements to prevent such movements is less than ideal, since this solution increases the risk of the warp threads becoming jammed.

It is also less desirable to adapt the reed itself to provide further guidance, as this weakens the reed itself and makes it more susceptible to wear.

Drawings

The invention will now be explained in more detail by the following detailed description of some embodiments of the reed of the invention. These descriptions are intended only to provide some illustrative examples and to demonstrate further advantages and features of the invention, and therefore should not be construed as limiting the scope of the invention or the patent rights defined in the claims.

In this detailed description, reference is made to the accompanying drawings using reference numerals, wherein:

figure 1 shows in cross-section a first embodiment of the reed and rapier assembly of the present invention;

figure 2 shows in cross-section a second embodiment of the reed and rapier assembly according to the invention;

figure 3 shows in perspective the reed of the assembly of figure 1;

figure 4 shows in top view the reed of the assembly of figure 1;

figure 5 shows in perspective view the centering zone of the reed of the assembly of figure 1; and

fig. 6 shows the centering area of fig. 5 in a top view.

Detailed Description

The reed (1) shown in fig. 1 and 3-6 is used in a rapier weaving machine operating according to the principle of a double rapier (6). In this case, the giver rapier (6) inserts the weft thread from the thread storage into the shed (18) between the spaced warp threads (17) from one side of the rapier loom to weave the fabric. The weft receiving rapier receives the weft from the weft insertion rapier (6) in the middle of the movement of the weft insertion rapier (6) along the reed (1), and carries the weft to the other side of the rapier loom. After the weft thread has been inserted into the shed (18) in this way, the inserted weft thread is made to strike the woven fabric in front of the weaving machine by means of the reed (1). In fig. 1, the reed (1) is moved to the left for this purpose. The position of the warp yarn (17) (above or below the shed) can be changed as desired to form the shed (18) again for the insertion of the next weft yarn.

In fig. 1, one rapier (6) among the rapier (6) is shown in a cross-sectional view.

The illustrated reed (1) is divided into different zones (7, 8, 9, 14) as shown in fig. 4.

In the center of the reed (1), where two rapier gripper (6) in the rapier weaving machine meet at a transfer point (12) for transferring the weft thread from the giver rapier (6) to the taker rapier, a transfer zone (8) is provided, in which transfer zone (8) all the reed dents (2) have the same diameter. The reed dents (2) each comprise a recess (3), the recesses (3) of the individual reed dents (2) forming a guide channel (5) for guiding the two rapier (6) towards a transfer point (12). The guiding operation is performed with high accuracy. The rapier (6) can be passed through the recesses (3), wherein the side walls of the recesses (3) prevent the lateral movement of the rapier (6) as far as possible. For this purpose, the dimensions of the recess (3) are selected in the transverse direction (in a direction at right angles to the direction of movement of the rapier (6) (the direction of movement towards or away from the formed fabric)) to correspond to the dimensions of the rapier (6). Here, the gap between the rapier (6) and the side wall of the recess (3) is minimized.

On both sides of the transfer zone (8), centering zones (7, 9) are arranged in positions adjoining the transfer zone (8). In these centering regions (7, 9), the reed dent (2) also comprises recesses (3), the recesses (3) of the individual reed dents (2) forming a guide channel (5) in each centering region (7, 9) for guiding the respective rapier (6). The recesses (3) do not completely prevent the lateral movement of the rapier (6) in the centering areas (7, 9). In the respective centering region (7, 9), the gap guiding the rapier (6) decreases in the direction towards the transfer point (12), so that the rapier (6) is increasingly centered in the recess (3) and can therefore be guided in the transfer region (8) with a minimum gap. This reduction in clearance can be seen more clearly in fig. 5 and 6. To achieve this reduction, the depth (d) of the recess (3)₁、d₂) Gradually decreases in the direction towards the transfer zone (8). In the illustrated embodiment, this reduction is linear. However, variations in which this reduction is not linear can also be devised. However, it is preferred that this reduction does indeed take place in a smooth manner. Due to the gradual reduction of the gap, the respective rapier (6) may already be introduced into said centering area (7, 9) of the reed (1) after the previous weft yarn has been beaten, while the reed (1) is still returning to its starting position from the formed fabric.

At its ends (10, 11), the reed (1) is provided with a conventional arrangement of dents (13) in each end zone (14), without said recesses (3). Since these dents (13) do not comprise recesses (3), the respective rapier (6) may have been introduced into this end region (7, 9) of the reed (1) after the previous weft thread has been struck, while the reed (1) is still returning to its starting position from the formed fabric.

The recesses (3) in the dents (2) shown are essentially U-shaped with an opening at the top which does not hinder the movement of the rapier (6) in the direction away from the reed (1). This movement is hindered by the warp yarns (17), as shown in figure 1.

As an alternative or in addition to the recesses (3), the dents (2) in the centering regions (7, 9) and the transfer region (8) can also be provided with projections (4), as shown in fig. 2, in which case these projections (4) together form a guide rib for guiding the rapier (6). In this case, the rapier (6) is provided with corresponding recesses (15), in which recesses (15) these projections (4) can engage for guiding the rapier (6). At this time, the widths of the projections (4) increase in the centering regions (7, 9) in a direction toward the transfer point (12) and remain unchanged in the transfer region (8). In the end region (14), the dents preferably have no such projections (4).

In an alternative, but less preferred embodiment, the end region (14) may also be omitted. Also, in an alternative but less preferred embodiment, the transfer zone (8) may be omitted.

For weaving machines with one rapier (6), the reed (1) can be constructed in a manner similar to the part of the reed (1) between the end (10) and the transfer point (12) shown, which in this case forms the other end of the reed (1).

Claims

1. Reed (1) for a rapier weaving machine, comprising a plurality of reed dents (2), each reed dent (2) comprising a recess (3) and/or a protrusion (4), wherein the recesses (3) of the reed dents (2) form a guide channel (5) and/or the protrusions (4) of the reed dents (2) form a guide rib, wherein the guide channel (5) and/or the guide rib are used for guiding a rapier (6) of the rapier weaving machine, wherein at least a part of the reed dents (2) is arranged in a centering region (7) between an end (10) of the reed (1) and a transfer point (12) of the reed (1), which transfer point (12) is located on the reed (1) at a point different from said end (10) of the reed (1), characterized in that in the centering region (7), seen in a direction at right angles to the moving direction of the rapier (6), the size of the recess (3) for guiding the rapier (6) decreases as the continuous reed dent (2) approaches towards the transfer point (12) of the reed (1) and/or the size of the projection (4) for guiding the rapier (6) increases as the continuous reed dent (2) approaches towards the transfer point (12) as viewed in a direction at right angles to the moving direction of the rapier (6).

2. Reed (1) according to claim 1, characterised in that a part of the dents (2) is arranged in a transfer zone (8) at the location of a transfer point (12) of the reed (1), wherein the dimensions of the recesses (3) and/or projections (4) remain substantially constant in this transfer zone (8).

3. Reed (1) according to claim 2, characterised in that the transfer zone (8) adjoins the centring zone (7).

4. The reed (1) according to any of the preceding claims, wherein the transfer point (12) is arranged between the two ends (10, 11) of the reed (1) and a part of the dent (2) is arranged not in the first-mentioned end (10) but in a second centering region (9) between the other end (11) of the reed (1) and the transfer point (12) of the reed (1), wherein in this second centering region (9) the dimension of the recess (3) decreases in the direction towards the transfer point (12) of the reed (1) and/or the dimension of the protrusion (4) increases in the direction towards the transfer point (12) of the reed (1).

5. The reed (1) according to claim 2 or 3, wherein the transfer point (12) is arranged between the two ends (10, 11) of the reed (1) and a part of the dent (2) is arranged not in the first-mentioned end (10) but in a second centering region (9) between the other end (11) of the reed (1) and the transfer point (12) of the reed (1), wherein in this second centering region (9) the dimension of the recess (3) decreases in the direction towards the transfer point (12) of the reed (1) and/or the dimension of the protrusion (4) increases in the direction towards the transfer point (12) of the reed (1), and wherein the second centering region (9) adjoins the transfer region (8).

6. The reed (1) according to any of claims 1 to 3, wherein the reed (1) comprises dents (13) arranged in an area (14) beside the first-mentioned dents (2) and free of the recesses (3) and/or protrusions (4).

7. The reed (1) according to any of claims 1 to 3, wherein all dents (2) of the reed (1) are the dents (2) having recesses (3) and/or protrusions (4).

8. The reed (1) according to any of the claims 1 to 3, characterised in that the transfer point (12) is arranged in the centre of the reed (1).

9. Assembly (16) of a reed (1) and a rapier (6) for a rapier weaving machine, characterized in that the reed (1) is a reed (1) according to any one of the preceding claims.

10. The assembly (16) according to claim 9, characterized in that the dent (2) of the reed (1) in the first-mentioned centering region (7) comprises said recess (3) and at least a part of the rapier (6) can pass in the recess (3), wherein the lateral movement of the rapier (6) is limited by the side walls of the recess (3).

11. Assembly (16) according to claim 9 or 10, wherein the assembly (16) comprises a second rapier for a rapier weaving machine.

12. Assembly (16) according to claim 10, wherein the assembly (16) comprises second rapier for rapier weaving machines and wherein the reed (1) is a reed (1) according to claim 4, wherein the dents (2) of the reed (1) in the second centering area (9) comprise said recesses (3), at least a part of the second rapier being passable in the recesses (3) in the second centering area (9), wherein the lateral movement of the second rapier is limited by the side walls of these recesses (3).

13. The assembly (16) according to claim 10, characterized in that the reed (1) is a reed (1) according to claim 2, the dent (2) of the reed (1) in the transfer zone (8) comprises said recess (3), and the recess (3) in the transfer zone (8) has a diameter corresponding to the diameter of the first-mentioned part of the rapier (6) that can pass in the recess (3).

14. An assembly (16) according to claim 10, characterized in that the guide channel (5) is provided with an opening which leaves the movement of each rapier (6) away from the reed (1) unhindered in a direction at right angles to the direction of movement of the rapier (6) through the recess (3).

15. The assembly (16) according to claim 9 or 10, characterized in that the dent (2) of the reed (1) comprising the recesses (3) and/or the protrusions (4) comprises the protrusions (4) and each rapier is provided with a recess (15), in which recess (15) the protrusion (4) can at least partially protrude to guide the rapier (6).

16. The assembly (16) according to claim 15, characterized in that the reed (1) is a reed (1) according to claim 2, the dent (2) of the reed (1) in the transfer zone (8) comprises the protrusion (4), and the protrusion (4) in the transfer zone (8) has a diameter corresponding to the diameter of the recess (15) in the first-mentioned rapier (6).

17. Rapier weaving machine, characterized in that it comprises an assembly (16) according to any one of claims 9 to 16.

18. Assembly of a rapier weaving machine and warp threads (17) incorporated into a fabric with the rapier weaving machine, characterized in that the rapier weaving machine is a rapier weaving machine according to claim 17 and the warp threads (17) are limiting elements for limiting the movement of the rapier (6) in the direction away from the reed (1).

19. Method for weaving using a rapier weaving machine with one or more rapier (6) and a reed (1), in which a shed (18) is formed, the rapier (6) or the rapier (6) is/are brought into the shed (18) by means of the reed (1) for inserting a weft thread in the shed (18), and the reed (1) is moved from a starting position towards the woven fabric for striking the weft thread, characterized in that the rapier weaving machine is a rapier weaving machine as claimed in claim 17, and that after the weft thread has been struck, the rapier (6) or the rapier (6) is/are brought into the newly formed shed (18) while the reed (1) is still moved towards the starting position.