TW201305405A - Single-gripper weaving loom - Google Patents

Abstract

A single-gripper loom (1) comprising: a receiving gripper (5) that is movable along a first sliding guide (6) through a weaving shed (10) from and to a gripping position (P2) outside the weaving shed (10) or close to a first opening thereof (10b) wherein said receiving gripper (5) receives one or more weft threads (2, 3), a weft selector (8), a weft feeder (12) to transfer the weft threads (2, 3) from the selector (8) to the receiving gripper (5), movable along a second sliding guide (7), between an intercepting position (P1) of the weft threads (2, 3), outside the weaving shed, and the gripping position (P2) wherein the receiving gripper (5) receives the weft threads (2, 3) from the weft feeder (12).

Description

Loom with single crepe

The present invention relates to a looms having a single crepe and a weaving method for a looms having a single crepe.

A looper using a double crepe machine is known in the technical background of a loom. According to a typical embodiment, the looms include a first carrying creter that receives one or more weft yarns from a weft picker and conveys them into a textile shed The textile shed is formed by a passage defined by two or more warp yarns, the warp yarns being configured according to individual planes extending from a common edge, the common edge being inserted into the fabric by the last slap of the steel shovel The last weft yarn is composed. In the weaving, the weft yarns extend from one of the other pieces to the manufactured fabric before being conveyed to the carrying crepe. Once a weft yarn has been gripped by the carrying crepe, the portion of the weft yarn extending from the already manufactured fabric to the carrying crepe is cut off before the weft yarn is inserted into the woven shed . Therefore, each time the carrying crepe is inserted into the woven shed, it carries only the weft yarn unwound from the individual crepe, and does not participate in the yarn portion from the fabric portion that has been manufactured. A cutting device is provided which is disposed between the position at which the yarn gripper receives the yarn and the textile shed to perform the cutting of the weft yarn. When the carrying crepe advances in the textile shed, a second receiving creator moves in the opposite direction. The crepers intersect in the middle of the textile shed and penetrate each other. By being controlled by an external controller A suitable lever controller that moves or is passively moved by the weft yarns, the weft yarns or the weft yarns are released by the carrier crepe and held by the receiving crepe. Following the exchange, the movement of the respective crepers is reversed, the carrier crepe returns to the initial position, and the receiving creator carries the weft yarns along the second half of the textile shed.

The looms of the above described double crepe allow high textile speeds to be achieved while allowing a relatively wide fabric to be manufactured. However, its existence has several disadvantages, the main disadvantages being: - For some types of weft yarns, for example for coarse, fine, multifilament, thick knots, or other kinds of weft yarns, the yarn winder There is difficulty in the exchange between - the number of structural defects, the difficulty of this exchange is produced in the fabric, which cannot be used for certain types of fabrics, such as technical fabrics or textile fabrics for medical applications. Accept, - low manufacturing flexibility, because it takes a considerable amount of time to adjust the loom in order to convert different manufactured items, the correction time will become quite long in the case of frequent replacement of the project.

In addition to looms with double creels, weaving machines with a single crepe designed to use a single crepe are also known, which carry the weft through the entire textile shuttle mouth. Such looms are possible to overcome the disadvantages associated with transferring the weft yarns from one crepe to another, while accepting lower weaving speeds and product widths. For example, the production of a loom comprising a single receiving gripper that directly receives the weft yarn from a fixed weft yarn supplying device is known. After the weft yarn has been clamped, the connection The yarn receiving device carries the weft yarn from a first end of the feeding device through the textile shed to a second distal end portion, and the yarn feeder is released when the distal end portion is reached. The weft yarn is returned toward the first end of the shed to receive more weft yarns.

The aforementioned looms with a single crepe do not represent a best solution for improvement in many respects, especially when focusing on flexibility and project replacement time.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a novel looms having a single crepe which overcomes the disadvantages reported by the prior art while permitting a high production flexibility, a wide range of fabric production and a short project change time. feature.

Another object is to make a looms of the type previously described which are capable of producing fabrics having a low degree of structural imperfections and are therefore particularly useful in the production of technical fabrics.

According to the invention, the aforementioned technical problem is solved by means of a looms having a single crepe having the features stated in the main patent application.

In particular, the present invention relates to a loom having a single winder comprising: - a receiving creping device movable along a first sliding guide from a gripping position through a spinning shuttle And moving through the textile shed to the gripping position, wherein the receiving gripper is in the position to receive one or a plurality of weft yarns for inserting the weft yarns from the first opening to the second opening of the textile shed into the textile shed, the clamping position being located outside the textile shed or adjacent to the first opening, - a weft yarn a picker acting on the weft yarns to move each of the weft yarns between a raised position spaced apart from the first guiding device and a lowered position adjacent the first guiding device, characterized in that Further comprising: - a weft yarn feeder for conveying the weft yarns from the weft yarn picker to the receiving yarn creator, the weft yarn feeder being movable along a second sliding guide device in a trapping position And between the clamping position, the trapping position is located outside the textile shed, wherein the weft feeder retains the weft yarns at the lowered position, and the receiving crepe is received at the clamping position These are the weft yarns from the weft feeder.

Thanks to the invention, it is thus possible to obtain a looms having a single crepe, wherein a single crepe receives the weft yarns from a weft feeder, the weft feeder acting on the weft picker and Between the crepe feeders, there is therefore a utility that can be compared to the function of the carry creter with a double crepe looper, but allows for a number of advantages to be achieved. Among these factors, in fact, in the present invention, before the weft yarn is cut, the weft feeder will lower each of the weft yarns by the picker and place it in a state of being fastened by the receiving yarn creator. Best location. This allows the weft feeder to be structurally simplified compared to a carrying gripper, without having a gripping element for retaining the weft yarns on the weft feeder, in fact for the weft feed Required for the device. This causes the weft yarns to be released from the weft feeder The opening becomes simpler and can have a relatively reliable grip on the portion of the receiving crepe. Furthermore, the weft loss is minimized by cutting the weft after the weft has been fastened by the receiving creator to the optimum position achieved by the weft feeder.

Compared with a conventional looms with double creels, the looms of the looms are simpler and easier to replace, and the production flexibility is also improved.

Another advantage is that the weft yarn is exchanged between the weft feeder and the receiving crepe, with fewer decisive problems, as it occurs outside the textile shed and before the weft yarn is cut. This obviously reduces the structural defects of the fabric obtained by the textile machine of the present invention.

Other advantages of the present invention are achieved by a looms having a single crepe in accordance with the scope of the claims. In particular, the present invention provides a looms in which the angle of the weft yarn relative to the sliding plane of one of the receiving creels can be varied by the rotation of the weft feeder. This can further help to increase the production flexibility of the loom of the present invention.

Other features and advantages of the present invention will be apparent from the following detailed description of the preferred embodiments of the invention.

Referring to the accompanying drawings, a looms having a single crepe in accordance with the present invention are generally indicated at 1.

Figure 1 shows a fabric T being woven in the fabric which is fixed to the loom 1. The strip T comprises a plurality of individual weft yarns 2, 3 and warp yarns 4a, 4b which are woven together in an orthogonal manner.

The loom 1 includes a receiving creator 5 that is moved by sliding through a textile shed 10 formed by a first portion 4a and a second portion 4b of the warp yarn, the first portion 4a and the second portion 4b Separately arranged along individual planes extending from a common edge 10a of one of the weft yarns, the weft yarns forming the last weft thread inserted into the strip of fabric T by the receiving gripper 5, as explained in more detail below . The textile shed 10 extends over a first opening 10b aligned with the first edge T1 of the fabric T and a second opening aligned with the second edge (not shown) parallel to the first edge T1 (not Shown between).

The angle between the planes of the warp yarns 4a, 4b constituting the textile shed can be adjusted by a plurality of healds, which are roughly indicated by the line 30 in Fig. 1, which itself The structure and function are known in the art. Between the healds 30 and one of the common edges 10a of the weft yarns, a reed 31 is provided, also schematically shown in Fig. 1, for pushing the respective weft yarns inserted into the textile shed 10 toward the strip. Cloth T. The shape and operation of the reed 31 are known per se.

The receiving crepe 5 is movable across a woven shed 10 along a sliding guide 6 produced by means of a semi-rigid driving strip 6a, the driving strip 6a being partially wound around a driving gear (not shown) to slide in a sliding direction F1 parallel to a common edge 10a of the weft yarn in a space between the reed 31 and the fabric T. One of them In a preferred embodiment, the strip 6a is straight in shape and has two opposing straight major faces that are configured to slide parallel to one of the strips 6a, the receiving crepe The device 5 is mounted on one of the faces of the two faces.

According to a further different embodiment of the invention (not shown), the sliding guide 6 is obtained by means of a rigid drive rod.

In general, according to other different embodiments of the present invention, the sliding guiding device 6 is obtained by driving a component other than a belt or a rod, as long as the driving element is capable of generating the receiving creator The required sliding movement.

The rotation of the drive gear and the subsequent translation of the drive strip 6a determine the sliding of the receiving creator 5 at a clamping position P2 (Fig. 4), wherein the receiving creator 5 receives one or more weft yarns 2 3, to insert it into the textile shed 10 from the first opening 10b to the second opening of the textile shed 10. The clamping position P2 is on the outer side of the textile shed 10 on the side of the first opening 10b.

According to a further different embodiment of the invention, the clamping position P2 is inside the textile shed 10, adjacent to the first opening 10b.

The receiving gripper 5 is of a known and conventional type and includes a hook end 5a for receiving and holding the weft yarns 2, 3. The receiving gripper 5 is operated by the strip 6a to pass through the entire textile shed 10 up to an end stroke position (not shown) outside the second opening of the textile shed 10. Near the end stroke position, the receiving creator 5 releases the weft yarns 2, 3 and returns to the clamping position P2 so as to receive other weft yarns for insertion. Into the textile shed 10. The weft yarns 2, 3 which must be taken by the receiving crepe 5 are selected by a weft picker 8 according to the characteristics of the cloth T, the weft picker 8 acting on a plurality of weft yarns, each of the weft yarns A separate piece (not shown) extends toward the fabric T being woven. The weft picker 8 is located outside the textile shed 10, on the side of the first opening 10b, and includes a plurality of rod members 8a, one end of each of the rod members 8a is provided with a weft yarn passing through it. Eyelet 8b. Each of the members is movable between a raised rest position shown in Fig. 1 spaced apart from the sliding plane B and a lower position shown in Fig. 2 adjacent the sliding plane B.

The weft picker 8 is of a known type, for example as described in the patents EP 0 894 882 and EP 0 948 883, and thus is not further detailed.

In the case shown in Figure 2 and the following examples, the weft picker 8 picks the two weft yarns to be inserted into the textile shed 10. In general, any number between one and the maximum number of weft yarns on which the weft picker 8 acts may be selected depending on other embodiments not shown.

The loom 1 further includes a weft feeder 12 for conveying the weft yarns 2, 3 from a bar of the weft picker 8 at a lower position to the gripping position P2 The yarn creator 5 is received. The weft feeder 12 is movable along a second sliding guide 7 which is produced by means of a semi-rigid drive strip 7a which is partially wound around a further drive gear (not shown). In order to be slidable in a sliding direction F2 aligned with the sliding direction F1 of the strip 6a.

According to a further different embodiment of the invention (not shown), the sliding guide 7 is obtained by means of a rigid drive rod.

In general, according to other different embodiments of the invention, the sliding guide 7 is produced by a drive element other than a strip or a rod, as long as it is capable of producing the receiving gripper 12 Sliding movement.

The strip 7a is also straight in shape and has two straight opposing major faces that are arranged parallel to the sliding plane B, the weft feeder 12 being mounted on one of the faces. The movement of the strip 7a is synchronized with the movement of the strip 6a of the receiving gripper 5 such that the weft feeder 12 can slide along the second guiding device 7 in a trapping position P1 and the grip Between the positions P2, the trapping position P1 is located outside the textile shed 10, and on the side of the first opening 10b, the weft feeder 12 is at the trapping position P1 to intercept the weft yarns at the lower position. And 3, and the receiving gripper 5 receives the weft yarns 2, 3 from the weft feeder 12 at the clamping position P2.

The movement of the weft feeder 12 is such that the gripping position P2 is between the trapping position P1 and the first opening 10b of the textile shed 10. After the weft yarns 2, 3 are given out to the receiving crepe 5 at the clamping position P2, the weft feeder 12 is actuated by means of the strip 7a to follow along the one bit The external starting position outside the position P1 moves. The weft feeder can be actuated from the starting position by means of the strip 7a and returned to the trapping position P1 so that other weft yarns can be trapped for delivery to the receiving gripper 5.

The weft feeder 12 is provided with a bore 13 which is elongate and which is adjustable in accordance with the sliding direction F1 of the receiving gripper 5. When the cavity 13 reaches the clamping position P2, the cavity 13 is easy to be sleeved. The hook end 5a of the gripper 5 is received. The bore 13 of the weft feeder 12 defines a first straight lower portion 14 of the strip 7a adjacent the second guiding device 7 and a second upper face opposite the first lower portion 14. Between 15 The weft feeder 12 has an almost hollow parallelepiped shape and further includes two straight side portions 21 extending between the first lower portion and the second upper surface portions 14, 15 to face each other. ,twenty two. Correspondingly, the bore 13 also has a parallelepiped shape.

The bore 13 includes a front opening 13a that faces the receiving gripper 5 and is susceptible to trapping the weft yarns 2, 3 when the weft feeder 12 reaches the trapping position P1.

The first and second faces 14, 15 respectively include a first recess 18 and a second recess 19 extending from the front opening 13a and being easily interposed in the weft feeder When the position P1 is between the nip position P2, the weft yarns 2, 3 are received. The weft yarns 2, 3 are positioned in individual end grooves of the grooves 18, 19 such that they traverse the cavity 13 from one of the first and second faces 14, 15 to another a face. The weft feeder 12 and in particular the grooves 18, 19 are not provided with any clamping elements for holding the weft yarns 2, 3. The gripping position P2 is conveniently adjacent to the trapping position P1 and the first opening 10b of the textile shed 10 such that the weft yarns 2, 3 are conveyed by the weft picker 8 by the weft picker 8 Up to the receiving gripper 5, there is no need to engage the gripping elements to hold the weft yarns 2, 3 in the weft feeder 12 .

According to a further different embodiment of the invention (not shown), at least one of the grooves 18, 19 is made on the sides of the weft feeder 12 On the 21, 22.

According to a further different embodiment of the invention (not shown), the weft feeder 12 comprises a manufacture on or in the upper surface portion 15 or on the side portions 21, 22 A single groove on one.

The weft yarns 2, 3 traverse the cavity 13 to the other face from one of the first and second faces 14, 15 to form a predetermined angle A with the sliding plane B. The angle A is generally between 0° and 180° and is selected depending on the type of the loom 1 and the processing parameters performed.

To change the angle A, it is possible to replace the weft feeder 12 with another weft feeder of the grooves 18, 19 of different sizes or positions, or by sliding around a parallel The rotation axis Y of the direction F1 is rotated to change the inclination of the weft feeder.

Alternatively, in accordance with a different embodiment of the present invention, the weft feeder 12 is selectively provided with a rotary actuator M for rotation during operation, and also along the sliding of the weft feeder 12 When the direction F2 slides, it rotates about the rotation axis Y to change the angle A during operation.

The receiving gripper 5 passes through the weft feeder 12 at its end portion of the stroke toward the clamping position P2, enters the cavity 13 via the front opening 13a, and is external to the hook end 5a. The weft yarns 2, 3 are moved to the side. In the first portion of the return stroke, the weft yarns 2, 3 held in the bore 13 between the first and second recesses 18, 19 are internal to the hook end 5a Clamped and carried towards the textile shed 10 (Fig. 5).

The loom 1 comprises a weft thread cutter 11 which is operable to cut the weft after the receiving gripper 5 has received the weft yarns 2, 3 The yarns 2, 3, as schematically illustrated in Fig. 6, in this figure, the weft thread cutter 11 is indicated by a pair of scissors.

The weft thread cutter 11 is operable to cut off when the receiving winder has reached an intermediate cutting position P3 between the clamping position P2 and the first opening 10b of the textile shed 10 The weft yarns 2, 3 are so that only the weft yarns unwound from the individual pieces are inserted into the textile shed without affecting the line segments from the portion of the cloth T.

Alternatively, according to a further different embodiment of the invention, the cutting position P3 is located inside the textile shed 10, close to the first opening 10b.

In a possible different embodiment of the invention, the cutting position P3 is configured such that the weft yarns 2, 3 are severed after they are clamped by the receiving gripper 5. The receiving gripper 5 thus reaches the cutting position P3 which is connected after the clamping position P2.

In all possible different embodiments of the present disclosure, the cutting position P3 is conveniently brought close to the clamping position P2 to minimize waste of the weft yarns 2, 3.

As shown in Fig. 1, the weft thread cutter 11 itself is of a known and conventional type and thus has not been described in detail.

The loom 1 can be operated in accordance with a weaving method which includes the weaving method described below.

In a first step, one or more weft yarns 2, 3 are selected by means of a weft picker 8. The weft yarns are held in a lower position (Fig. 2) at which the weft yarns can be retained by the weft feeders 12. In this step, the weft feeder 12 is in the starting position and the intercepting position P1. At the same time, the receiving gripper 5 is positioned between the end stroke position and the gripping position P2.

In a second step, by means of a weft feeder 12, the weft yarns 2, 3 are trapped at a lower position (Fig. 3) so as to be arranged through the bore 13 in the first and Between the second grooves 18, 19. The entrapment of the weft yarns 2, 3 occurs when the weft yarn feeder 12 is in the retentate position P1 and is reached by the sliding of the starting position toward the textile shed 10.

In a third step, the weft feeder 12 is translated from the trapping position P1 to the gripping position P2 outside the textile shed 10, where the weft feeder 12 is coupled to the receiving crepe The device 5 is handed over, and the receiving creator 5 extends through the weft feeder 12 into the cavity 13 (Fig. 4). In this step, the operation of the weft feeder 12 enables the weft yarns 2, 3 to be clamped therein to be effectively stretched to facilitate the portion of the receiving creator 5 Grasp.

In a fourth step, at the gripping position P2, the weft yarns 2, 3 are conveyed by the weft feeder 12 to the receiving gripper 5, the receiving gripper 5 wefting the weft yarns 2, 3 The height of the hook end 5a is held and transmitted to the textile shed 10 while being translated from the gripping position P2 toward the end stroke position (Fig. 5).

In a fifth step, the weft yarns 2, 3 are cut off by the weft thread cutter 11 after they have been conveyed to the receiving crepe 5, before being inserted into the textile shed 10 .

In a sixth step, the weft yarns 2, 3 are inserted into the textile shed 10 by means of a receiving crepe 5 until the end stroke position has been reached. The weft yarns 2, 3 are released when approaching the end stroke position. During the fifth step and the sixth step, the weft feeder 12 returns to the starting position.

According to other different embodiments of the method of the present invention, as described in detail above, the clamping position P2 and/or the cutting position P3 are inside the textile shed 10, adjacent to the first opening 10b.

The above method can also be operated on a loom other than the aforementioned loom 1, as long as it has a single receiving and twisting device for inserting the weft into the inside of the textile shed, and one for The weft yarn is conveyed from a weft picking device to the weft feeder of the receiving crepe.

The above-mentioned technical solutions enable the set goals and objectives to be fully achieved with reference to the well-known techniques cited therein, among which, emphasis is placed on the high yield elasticity of the weft yarns that can be processed through a wide range of processes. The fact that it is difficult to hold and replace between coarse, fine, multifilament, thick knots, or other creers known to be commonly used in double creers Weft yarn.

1 is a perspective view of a feature portion of a looms having a single crepe according to the present invention, FIG. 2 is a perspective view of a detail of the looms of FIG. 1, and FIG. 3 is a perspective view of FIG. A perspective view of the detail in different operational states, and FIG. 4 is a perspective view of the loom of FIG. 1 in another detail different from the operational state of FIG. 5 and 6 are two perspective views of the detail of Fig. 4 in two different individual operating states, Fig. 7 is a perspective bottom view of the detail of Fig. 2, and Fig. 8 is a front view of the detail of Fig. 2. Figure 9 is a top plan view of the detail of Figure 2.

Claims (11)

A looms (1) having a single crepe machine, comprising: a receiving creping device (5) movable along a first sliding guiding device (6) from a clamping position (P2) The receiving crepe (5) receives one or more weft yarns in the position through a textile shed (10) and through the textile shed (10) to the clamping position (P2) (2) 3) inserting the weft yarns from the first opening (10b) of the textile shed (10) into the second opening into the textile shed (10), the clamping position (P2) being tied to the textile shed (10) outside, or adjacent to the first opening (10b), a weft picker (8) acting on the weft yarns to move each of the weft yarns (2, 3) to one and the first guide Between the raised position of the device (6) and a lowered position adjacent the first guiding device (6), characterized in that it further comprises: a weft feeder (12) for the weft yarns ( 2, 3) from the weft picker (8) to the receiving crepe (5), the weft feeder (12) can be moved along a second sliding guide (7) in a trapping position (P1) and the clamping position (P2), the interception position (P1) Positioned outside the textile shed (10), wherein the weft feeder (12) retains the weft yarns (2, 3) at the lowered position, and the receiving crepe (5) is attached to the clamping position (P2) receiving the weft yarns (2, 3) from the weft feeder (12). A looms (1) having a single crepe as claimed in claim 1, wherein a severing element (11) is provided, which can be used once the receiving creper (5) When the weft yarns (2, 3) have been received, they are operated to cut the weft yarns (2, 3). A looms (1) having a single crepe as claimed in claim 1 or 2, wherein the first and second guiding means (6, 7) are aligned with each other, and the weft feeder (12) ) having a bore (13) that is easily nested in at least the gripping position (P2) for at least a portion of the receiving gripper (5) when the weft feeder (12) When between the trapping position (P1) and the gripping position (P2), the weft yarns (2, 3) are apt to traverse the bore (13). A looms (1) having a single crepe as claimed in claim 3, wherein the cavity (13) of the weft feeder (12) is defined adjacent to the second guiding device (7) Between at least a first lower portion (14) and at least one second upper surface portion (15) opposite the first lower portion (14), the weft feeder (12) includes at least one of the trapping positions ( The first groove (18, 19) of the weft yarns (2, 3) is easily received between P1) and the clamping position (P2). A looms (1) having a single crepe as claimed in claim 4, wherein the first and second grooves (18, 19) are sized such that the weft yarns (2, 3) Traversing the cavity (13) between the trapping position (P1) and the clamping position (P2), thus forming an angle (A) of 0° to 180° with a sliding plane (B), The sliding plane (B) is parallel to the first and second sliding guides (6, 7). A looms (1) having a single crepe as claimed in claim 5, wherein the weft feeder is rotatable about a rotation axis (Y) parallel to the second sliding guide (7) In order to be able to change the angle (A) during use. A weft feeder (12) for a looms (1) of a single crepe, and a sliding guide (7) of the looms (1) with a single crepe Coupling, the weft feeder (12) comprises: a cavity (13) for receiving a yarn acceptor (5) of one of the looms (1) with a single winder to the weft yarn In the feeder (12), a first and a second groove (18, 19) are apt to receive one or more weft yarns (2, 3) such that when the receiving crepe (5) is socketed In the weft feeder (12), the weft yarns (2, 3) are traversed through the bore (13) and held by the receiving crepe (5), characterized in that the weft feeder (12) There are no clamping elements for holding the weft yarns (2, 3). The weft feeder (12) of claim 7, wherein the weft feeder (12) further comprises: a first lower portion (14) and a second upper surface portion (15), the first lower portion The face (14) is easily disposed at a position adjacent to the sliding guide (7), and the second upper face (15) is opposite to the first lower portion (14), the cavity (13) is Defined between the first and second faces (14, 15), the first and second grooves (18, 19) are respectively provided on the first and second faces (14, 15) )on. A weft feeder (12) according to claim 8 wherein the weft feeder (12) has an almost hollow parallelepiped shape and includes two extending from the first and the first A flat side portion (21, 22) facing the opposite faces between the two faces (14, 15). A weaving method for a looms of a single crepe machine, comprising the steps of: selecting one or more weft yarns (2, 3) by a weft picker (8), The weft yarn feeder (12) is intercepted by a weft yarn feeder (12), and the weft yarn feeder (12) is translated to a clamping position (P2) of the weft yarns (2, 3), Holding position (P2), the weft yarns (2, 3) are transferred from the weft feeder (12) to one of the looms (1) of the single crepe receiving crepe (5), The weft yarns (2, 3) are inserted into a textile shed (10) by the receiving crepe (5). A spinning method according to claim 10, further comprising the step of cutting the weft yarns (2, 3) once the weft yarns (2, 3) have been conveyed to the receiving yarn creator (5).