JP2000110050A - Apparatus for inserting warp yarn - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an apparatus for inserting warp yarns applicable to various warp yarns by combining the simplicity of the operating speed of negative type tweezers with the magnitude of flexibility of positive type tweezers. SOLUTION: This apparatus for inserting warp yarns is capable of sliding both tweezers 1 for introduction capable of pressing each warp yarn 15 toward a nipping and attaching region 3 with a movable member 9 and nipping the warp yarn 15 and tweezers 20 for withdrawal in which a movable member 29 is pressed to a nipping and attaching region 23 on a surface formed on a reed and displacing both the tweezers 1 and 20 to an exchange region 16, reducing the nipping force of the tweezers 1 for the introduction by actions of a magnetic field by a permanent magnet 17 provided on the reed near the exchange region 16, increasing the nipping force of the tweezers 20 for the withdrawal, taking away the warp yarn 15 from the tweezers 1 for the introduction by the tweezers 20 for the withdrawal and than making both the tweezers 1 and 20 leave from the exchange region 16 in the apparatus for inserting the warp yarns of a loom equipped with the tweezers 1 and 20.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to the field of looms,
More specifically, the present invention relates to a loom in which insertion of a warp is ensured by tweezers. The aim of the invention is more precisely the improvement of tweezers in a thread changing mechanism.

[0002]

BACKGROUND OF THE INVENTION As is known, in a loom with tweezers, the device for inserting the warp is essentially two tweezers, i.e. by alternating movement, the same distance from both sides of the fabric as the warp. It is composed of tweezers for introduction and retraction, which are displaced to the exchange area through the opening of the weft.

[0003] These tweezers move back and forth between the warp and the weft by sliding on the surface formed on the "tail", and the tweezers for introduction exert a pinching force on the warp and exchange them. Entrained to the area, the exiting tweezers exert a pinching force on the warp and pull it back to the opposite edge of the fabric.

[0004] As is already known, the loom and the tweezers are divided into two systems which are different from each other in the operation at the time of yarn exchange.

[0005] That is, a so-called "positive type" described in European Patent No. 0 690 160, British Patent No. 2059 455, or German Patent Document DE-U-298 08 997. In the tweezers of "", mechanisms which operate when the tweezers reach the exchange area are provided in the tweezers for introduction and withdrawal. The mechanism provided in the tweezers for introduction opens as soon as the mechanism of the tweezers for exit closes the warp while closing. in this way,
The warp yarn is always caught on transfer from one tweezer to the other. Control of these different mechanisms is realized by a mechanical method using an inclined surface of a cam or an electromechanical method using an electromagnet. With the "positive" forceps, the maximum speed of the weaving will be slowed down due to the need to control the complicated movement of the provided mechanism.

[0006] Simpler mechanism looms of the type called "negative" tweezers are likewise known.
In this loom, the introduction tweezers can exert a pinching force on the warp in order to entrain the warp to the exchange area, while the exit tweezers take the yarn from the introduction tweezers and push it against the fabric. It is configured to be able to exert a pinching force on the warp in order to pull it back to the bamboo rim on the side.

[0007] More precisely, this warp is captured by the tweezers tips forming a lever and spring system.

[0008] The warp is guided to the center of the fabric and is transferred to tweezers for exit. The exit tweezers are hook-shaped, and take the warp from the introduction tweezers during the return movement. The warp is captured within the hooks of the retraction tweezers by a spring-loaded corner and lever system. Compared to "positive" tweezers,
Devices with negative tweezers have the advantage that the tweezers do not have to be brought to the center of the machine in order to carry out a "positive" transfer of the warp yarns, and thus have a more regular movement.

[0009] Instead, in the "negative" forceps, the transfer from one forceps to the other forceps is carried out by robbing the introduction tweezers by the retraction tweezers.
Due to the binding force exerted on the yarn, it could not be applied to irregular yarns such as warp yarns.

[0010]

The problem to be solved by the present invention is to reduce the operating speed and the simplicity of movement of the "negative" forceps to the flexibility of the "positive" forceps and to various yarns. In combination with the breadth of applicability.

[0011]

SUMMARY OF THE INVENTION Accordingly, the present invention provides
A warp insertion device usable for a loom equipped with tweezers, wherein tweezers for introduction and retraction are displaced by the same distance from both sides of the fabric through the opening of the warp and weft to the exchange area. , These tweezers are
The warp and weft open and close by sliding on the surface formed on the 'Osa', and the tweezers for introduction exert a pinching force on the warp, which can be carried to the exchange area, and Tweezers apply a pinching force to the warp,
This can be removed from the tweezers for introduction near the exchange area.

The apparatus further includes means for reducing the pinching force of the tweezers for introduction when the tweezers for introduction have arrived near the exchange area, and means for retreating when the tweezers for exit have arrived near the exchange area. It is characterized by comprising means for increasing the pinching force by tweezers.

In other words, the present invention relaxes the holding force on the yarn in the tweezers for introduction when the tweezers for introduction reaches the replacement area, and at the same time, the tweezers for retraction seize the warp from the tweezers for introduction. At the moment, the gripping force of the retraction tweezers is increased to facilitate the transfer of the warp yarn from one tweezer to the other.

[0014] Thus, the movement of the tweezers remains relatively fast, as with "negative" tweezers.
By assisting the pinching member of the tweezers, it became possible to pass irregular yarns such as change yarns.

Of course, in a minimal embodiment, only the introduction tweezers may be provided with the means according to the invention, or, conversely, only the exit tweezers may be assisted in thread deprivation. good.

Substantially, the means for reducing the compressive force is provided by the magnetized member provided on the pole, the magnetized member disposed on the pole, near the exchange area. It comprises a member of introduction tweezers movable by the effect of a magnetic field, and a member of exit tweezers movable by the effect of a magnetic field generated by the member disposed on the pole.

In other words, the reduction and / or increase of the force of clamping the tweezers is controlled by the magnetic force without any mechanical contact as the tweezers pass over the exchange area. Therefore, the problem of wear due to the contact of the control pieces is avoided.

The problem of having to introduce mechanical parts through the plane of the warp can likewise be avoided.

In practice, the magnetized member arranged on the pole may move on a member made of a ferromagnetic material, or may move on a member itself magnetized.

As described above, in the first embodiment, the movable member of the introduction tweezers is arranged in a region facing the “tipped” on the introduction tweezers to form a so-called sandwiching member. This is a component made of a ferromagnetic material and lifted to the above-mentioned region via a compression spring.

In other words, the driving member of the tweezers forming the so-called clamping area includes two members facing each other. The member closest to the 'tail' is mounted on a spring so that the tweezers can be applied to the opposite member as it traverses its main trajectory.

Alternatively, when the tweezers reach the front of the magnet placed on the 'tail', this member will
Attracted to the side and compresses the spring, thereby reducing the pinching force of the thread.

The reverse arrangement can be applied to the exit tweezers. That is, the movable member is disposed in a region on the opposite side of the “tweezers” on the tweezers, and is mounted in the same region via a spring.

In another embodiment, the member of the movable introducer tweezers is a magnetized member arranged in an area opposite to the 'tail' of the introducer tweezers to form a so-called clamping member. And the magnetized member is
The surface of the magnetized member integral with the 'tail' and the surface of the member moving opposite to each other are arranged to have opposite magnetic poles.

Therefore, the tweezers for introduction are "Osa"
When the magnetized member of the tweezers comes to the front of the magnetized member, the magnetized member of the tweezers is pulled downward, loosening the warp.

On the other hand, with respect to the retraction tweezers, the movable member is formed by a so-called clamping member.
The magnetized member may be a magnetized member disposed on the introduction tweezers in a region opposite to the 'tail', the magnetized member being a surface of the magnetized member integral with the 'tail', The member and the surface of the member moving to face each other are arranged so as to have the same magnetic pole.

In a variant of the embodiment, the introduction tweezers comprises a second magnetized member for forming a so-called clamping area together with the first magnetized member, The poles of the magnetized member are oriented to attract the first magnetized member.

As described above, outside the exchange area, the clamping force is secured by the attraction between the two magnetized members of the tweezers.

The same arrangement can be applied to the exit tweezers.

[0030]

BRIEF DESCRIPTION OF THE DRAWINGS The method of carrying out the invention and the advantages of the invention based on it will be more apparent from the following description of an embodiment, taken in conjunction with the accompanying drawings. 1 is a side view of an introduction tweezer implemented according to the first embodiment; FIG. 2 is a side view of an exit tweezer implemented according to the same principle as FIG. 1; FIG. 3 is an introduction tweezer that functions according to the second embodiment. FIG. 4 is a side view of the retraction tweezers functioning in the same embodiment; FIGS. 5 (a) to 5 (f) show the introduction and the transfer according to the progress of the yarn transfer according to the first embodiment. FIG. 6 (a) to FIG. 6 (f) are side views of warp replacement areas corresponding to various strokes of the movement of the exit tweezers;
5A to 5F are side views of a warp yarn exchange area corresponding to various strokes of the movement of the introduction and retraction tweezers in accordance with the progress of the yarn transfer according to the second embodiment. (In each assembly drawing, the drawings are arranged one above the other to make it easy to see the progress of the separate tweezers).

As already mentioned, the present invention provides a "negative" forceps at the moment of transfer by robbing.
The mechanism comprises a mechanism capable of simultaneously loosening the thread on the introduction tweezers and increasing the pinching by the exit tweezers.

[0032] These mechanisms are called "Osa" near the exchange area.
It works by the action of a permanent magnet provided above, which acts at the level of the tweezers and acts on a mechanism formed by ferromagnetic components or components that are themselves magnetized.

(First Embodiment) As shown in FIG. 1, the introduction tweezers 1, more precisely, the ends of the introduction tweezers 1 face forward, that is, in the direction of travel of the lance when the warp yarn is introduced. It has an opening 2.

The opening 2 has a sandwiching area 3 composed of two faces 4 and 5 facing each other, and a warp is sandwiched inside a narrow gap 6 formed by the two faces 4 and 5. .

According to the first embodiment of the present invention, the tweezers are provided with a portion 8 which is to be opposed to the 'tail'.
And a movable member 9 slidable in the storage section 10. This member is made of a ferromagnetic material, for example, steel with a high carbon content.

Between the member 9 and the bottom of the storage section 10, a compression action is provided, that is, the member 9 is provided on the outer side of the storage section 10 when the surface 4 forms a surface facing the clamping area 3 when the member 9 is relaxed. A spring 11 for pushing in the direction is interposed.

The retraction tweezers 20 shown in FIG. 2 has an opening 22 facing the rear of the lance so that a hook is formed to take out the warp thread 15 from the introduction tweezers.

The opening 22 has two surfaces 24 and 25 for forming a gap 26 having a small size that can sandwich the warp 15.
Has a pinching region 23 formed by.

In accordance with the present invention, the tweezers portion 28 which forms a hook and is spaced from the 'pod' has a storage portion 30 in which a ferromagnetic material member 29 is slidably supported. ing.

The bottom of the storage section 30 has a compression action,
That is, the spring 31 that pushes the member 29 out of the storage unit 30 is provided.

The operation of the present invention is shown in FIGS.
It is shown in (f). That is, in FIG. 5A, both the tweezers 1 for introduction and the tweezers 20 for retreat have moved in the direction of the exchange area 16.

The exchange area 16 is provided with a permanent magnet 17 magnetized so as to be oriented toward the trajectory of the tweezers 1 and 20 at the level of the “tail” (not shown).

Therefore, before reaching the exchange area 16,
The movable member 9 of the introduction tweezers 1 is pressed toward the clamping region 3 in order to confine the thread 15 with the opposite surface 4, and the spring 11 effectively clamps the thread 15. I'm sure. In the retraction tweezers 20, the movable member 29 is pressed by the spring 31 in the direction of the holding region 23.

As shown in FIG. 5B, the exit tweezers 20 continue to advance and pass through the exchange area 16 without changing the state of the introduction tweezers 1.

Next, referring to FIG. 5C, the tweezers 1 and 20 for introduction and retraction intersect on the downstream side of the exchange area 16.

Referring to FIG. 5D, the tweezers for introduction 1
The exit tweezers begin a retreating movement when passes over the front end of the exit tweezers 20. At this moment, the two tweezers face the permanent magnet 17 supported on the 'tail'. By the action of the magnet 17, the shapes of the tweezers 1 for introduction and the tweezers 20 for exit are changed.

In the case of the tweezers 1 for introduction, the permanent magnet 17
Acts on the member 9 to draw it toward the bottom of the storage portion 10 and relaxes the pinching force exerted on the warp 15. Therefore, the compression spring 11 is further contracted.

In the case of the retraction tweezers 20, the permanent magnet 17 supported by the “tail” draws the member 29,
The member 29 moves downwardly toward the limb, and narrows the opening of the pinching area. As a result, the pinching force exerted on the thread 15 by the retraction tweezers 20 increases.

As described above, the passage or transfer of the yarn from the introduction tweezers to the exit tweezers was extremely reliable, and a relatively irregular warp yarn could be used.

As shown in FIG. 5 (e), the tweezers for introduction continue to retreat and the exchange area 16
Exit from As long as the exit tweezers 20 face the permanent magnet 17, the warp yarn 15 is strongly sandwiched, and a good take-off is secured.

Next, as shown in FIG. 5 (f), the tweezers are no longer in the action of the permanent magnet 17, and the movable member 9 of the introduction tweezers 1 is brought into contact with the surface 4 forming the opposing surface of the clamping area 3. The movement is complete when in the abutting relaxed state.
With respect to the retraction tweezers 20, the movable member 29 is no longer affected by the permanent magnet 17, but is slightly retracted into its storage portion 30.

(Second Embodiment) According to a modified embodiment shown in FIG. 3, an introduction tweezer 41 having an opening 42 also facing forward has two permanent tweezers at the level of the clamping area 43. It has magnets 47 and 49. The member 49 on the side arranged on the part 48 to be opposed to the “tail” is slidably supported in the storage part 50.

The introduction tweezers 41 likewise comprise another magnetized member 47 fixedly arranged at the part of the tweezers opposite to the 'tail'.

The polarities of the members 47 and 49 are arranged such that they attract each other to ensure an effective clamping force against the yarn when the warp is located in the clamping region 43. That is, the attractive force between the two magnets 47 and 49 plays the role of the compression spring 11 in the embodiment shown in FIG.

The retraction tweezers 60 shown in FIG. 4 also includes magnetized members 69 and 67, which are referenced. The magnetized member 69 is slidably supported in a storage section 70 provided at a position of the retraction tweezers 60 facing the “pod”. The member 67 is fixed inside a portion of the retraction tweezers 60 where the hook 68 is formed. The magnetic poles of the magnetized members 69 and 67 are selected and set so that the two members 69 and 67 attract each other and the sandwiching of the warp yarn 15 is ensured.

The operation of the apparatus according to this embodiment is described in FIG.
(A) to FIG. 6 (f). That is, before reaching the exchange area 16, the magnetized movable member 49 is pulled by the opposing member 47, and as such, secures the warp 15 in the holding area 43. Also in the retraction tweezers 60, the magnetized members 67 and 69 are attracted to each other.

In the illustrated example, the member 49 of the introduction tweezers 41 has an N-pole in the direction of the clamping region, and the member 47 on the opposite side has its S-pole directed to the clamping region 43. Therefore, the member 49 has the south pole facing the 'tail' side. The permanent magnet 17 provided on the 'tail' has its north pole towards the exit and introduction tweezers.

In the retraction tweezers, the magnetic poles are arranged in reverse, that is, the N pole of the member 69 is oriented in the direction of the pole, while the S pole is oriented in the clamping region and the N pole of the member 67 is And is facing.

In FIG. 6B, the exiting tweezers pass through the exchange area 16 when they move, as shown in FIG. 5B. At this time, as shown in FIG.
The introduction tweezers 41 continue to move in the direction of the exchange area 16 and the warp passes over the hook-forming part 68.

As shown in FIG. 6 (d), the tweezers for retreating continue to retreat, and the tweezers for introduction and retreating are moved under the influence of the permanent magnet 17 in the replacement area. Located in.

More precisely, the permanent magnet 17 acts on the tweezers 41 for introduction, and the magnets 17 and 49 facing each other.
Are opposite in polarity, so that the magnetized member 49 is drawn downward to the bottom of the storage unit 50. As a result, the pinching force of the warp at the level of the tweezers for introduction is slightly relaxed. On the retraction tweezers 60, the members 69 are pushed back by the permanent magnet 17 because the opposite polarities of both members are the same. As a result, the member 69 is pushed out of the storage section 70 and presses the thread 15 against the member 67 supported by the hook 68.

In this way, at the moment when the yarn is robbed, the yarn is more strongly clamped by the retraction tweezers 60.

Next, as shown in FIG. 6F, the two tweezers leave the exchange area, and the member 49 of the introduction tweezers 41 returns to the position where it abuts the member 47 for attracting the tweezers.

In the case of the retraction tweezers 60, the auxiliary clamping force caused by the repulsion of the magnetized member 69 by the magnet 17 is eliminated. The clamping force of the warp 15 is ensured only by the attraction between the magnetic members 67 and 69.

Of course, the invention is a variant embodiment in which the two embodiments of FIGS. 1 to 4 are mixed, ie one tweezer comprises a ferromagnetic movable member and the other tweezers comprises a magnetized member. Examples with are also covered.

The invention also covers an alternative embodiment in which only one of the tweezers is provided according to the invention, in which case the deprivation is not performed in a very secure manner.

The present invention is directed to a modified embodiment in which a permanent magnet member disposed on a 'pod' is constituted by one or more electromagnets controlled in a suitable manner to have the required magnetic poles. Also cover.

From the above, the warp insertion device according to the present invention retains the weave tone of the negative tweezers and does not require the use of complex auxiliary mechanical parts which cause contact and wear. It can be seen that it has the advantage that it can also be used for relatively irregular warp yarns.

[Brief description of the drawings]

FIG. 1 is a side view of an introduction tweezer implemented according to a first embodiment.

FIG. 2 is a side view of the exit tweezers implemented on the same principle as FIG.

FIG. 3 is a side view of an introduction tweezer that functions according to a second embodiment.

FIG. 4 is a side view of exit tweezers functioning in the same embodiment.

FIG. 5A is a diagram for explaining the transfer of the yarn according to the first embodiment, and a diagram showing a state in which both the introduction and retraction tweezers are moving in the direction of the exchange area; (B) is a view showing a state in which the tweezers for introduction and retreat have further advanced from the state of FIG. (A), and the tweezers for retreat have passed the exchange area. FIG. 5D shows a state in which the exit tweezers advance and the introduction and exit tweezers intersect on the left side of the exchange area. FIG. 9D shows the state in which the introduction tweezers advance from the state shown in FIG. FIG. 4E shows a state in which the tweezers for introduction start to retreat from the state of FIG. 5D, and FIG. 5F shows a state in which the tweezers for introduction and retreat further retreat from the state of FIG. Influenced by magnets It is a figure showing that it is in a state without.

FIG. 6A is a view for explaining the transfer of the yarn according to the second embodiment, showing a state in which both the introduction and retraction tweezers are moving in the direction of the exchange area; (B) is a view showing a state in which the tweezers for introduction and egress have further advanced from the state of (a), and the tweezers for egress have passed through the exchange area. FIG. 4D shows a state in which the introduction tweezers advance and the introduction and exit tweezers intersect on the left side of the exchange area. FIG. 7D shows a state in which the introduction tweezers advance from the state of FIG. (E) shows a state in which the introduction tweezers start to retreat from the state of (d), and (f) shows that the introduction and exit tweezers further retreat from the state of (e), and the permanent magnet Unaffected It is a figure showing that it is in a state.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Introduction tweezers 15 Warp 16 Exchange area 17 Permanent magnet on 'Osa' 20 Exit tweezers 41 Introduction tweezers 60 Exit tweezers

Claims (8)

[Claims] 1. A warp insertion device usable for a loom equipped with tweezers, comprising: an introduction tweezer (1, 41) and an exit tweezer (2).
0,60) by means of an alternating movement through the opening of the warp and the weft by the same distance from both sides of the fabric and to the exchange area (1).
6), these tweezers move back and forth between the warp and the weft by sliding on the surface formed on the 'tail', and the tweezers (1, 41) for introduction introduce the warp (15) Can be exerted on the warp (15) in order to entrain the warp (15) to the exchange area (16), and the retraction tweezers can be used to introduce the tweezers (15) near the exchange area (16). ) To take away from the warp (1
Means for reducing the clamping force of the introduction tweezers (1, 41) when the introduction tweezers (1, 41) arrive near the replacement area (16), and A warp insertion device, comprising: means for increasing the clamping force of the exit tweezers (20, 60) when the exit tweezers (20, 60) arrive near the exchange area (16). 2. A means for reducing the clamping force of the introduction tweezers (1, 41) and increasing the clamping force of the retraction tweezers (20, 60) includes: A magnetized member (17) provided, a member (9,49) of the introduction tweezers (1,41) movable by the effect of a magnetic field generated by the magnetized member (17) arranged on the pole; ), And members (29, 69) of exit tweezers (20, 60) movable by the effect of a magnetic field generated by the magnetized member (17) disposed on the pole. The warp insertion device according to claim 1. 3. The movable member (9) of the introduction tweezers (1) is used to form a so-called clamping member.
A component made of a ferromagnetic material disposed in a region (8) of the introduction tweezers (1) opposite to the 'tail', and is lifted to the region (8) via a compression spring (11). 3. The warp insertion device according to claim 2, wherein: 4. The movable member (29) of the retraction tweezers (20) has an area (2) on the side opposite to the 'tail' on the retraction tweezers to form a so-called clamping member.
The warp insertion device according to claim 2, characterized in that it is a component made of a ferromagnetic material arranged in (8) and is lifted to said area via a compression spring (31). 5. A movable member of the introduction tweezers (41) is a magnetized member disposed in a region (48) of the introduction tweezers opposite to the tab on the introduction tweezers to form a so-called clamping member. The magnetized component (49) is a magnetized component (49), the magnetized component (49) being a surface of a magnetized member (17) fixed to a 'tail', and the component (6) opposed to this.
The warp insertion device according to claim 2, wherein the surface of (9) has the same magnetic pole. 6. The movable member of the retraction tweezers (60) is magnetized, which is arranged in a region on the side of the retraction tweezers opposite to the 'tail' to form a so-called pinching member. A part (69), wherein the magnetized part (69) is a magnetized member (1
The warp insertion device according to claim 2, characterized in that the surface of (7) and the surface of the component (49) facing each other have opposite magnetic poles. 7. The introduction tweezers (41) include a first tweezer.
A second magnetized component (47) forming a so-called pinch region with the magnetized component (49) of
The warp insertion device according to claim 5, characterized in that the magnetic poles of the magnetized part (47) are oriented to attract the first magnetized part (49). 8. The tweezers for retraction (60) includes a first tweezer.
A second magnetized component (67) forming a so-called pinch region with the magnetized component (69) of
7. The warp insertion device according to claim 6, wherein the magnetic poles of the magnetized part (67) are oriented to attract the first magnetized part (69).