JP2016520729A - How to insert a weft end on a loom with an additional weft effect - Google Patents

Abstract

The present invention relates to a method of inserting a weft end into a shed (1.1, 1.2) of a loom. The weft (3) is selected by the weft selection means (19), inserted into the shed by the weft insertion means, and fastened to the edge of the fabric by the weaving heel device (7, 7.1, 10). The tightened weft (3) is held in the region of the fabric edge at a specific position by the weft holding means, but the hook is changed by the opening means (4) after the weft insertion. The wefts are slidingly displaced by the weft holding means so that they reach a position where they are cut by the weft shearing machine. Thus, after the weft end portion is created, the weft end portion is gripped by the tacking means, and the weaving shed is tacked. During the two weft insertion steps in which the first and second wefts are continuous, even if further weaving is performed by the weaving device, the weft is not inserted, is not beaten against the front of the weave, and the first And a step in which the weft end of one inserted weft is not tucked into the shed and the effect yarn extending in the warp direction to create an additional weft effect is displaced in the weft direction on the loom by a displacement device. And

Description

  The present invention relates to a method of inserting a weft end, i.e. tuck-in, on a loom having an additional weft effect.

  In the prior art in looms, it is known to provide additional yarns extending essentially in the warp direction to participate in the interlacing or forming of the fabric so that certain additional weft effects are obtained. For these purposes, these effect yarns are carried to different positions before weft insertion in each operation cycle of the loom.

  For example, WO 2012/004021 presents a weaving machine for the production of textiles having a weaving pattern forming method and such an additional weft effect. In the textile manufacturing method according to International Publication No. 2012/004021, the effect yarn is positioned on the weft to be inserted, so that the effect yarn is formed perpendicularly from the heel gap formed by the dents to be woven and opened on one side toward the top. Appears in the direction. After the sliding displacement in the weft direction, the effect yarn is positioned under the next weft yarn to be inserted, thereby entering another similarly formed heel gap.

  In order to create an operating sequence according to the described method, the guide means for the effect thread are moved in the vertical and weft directions. The loom according to WO 2012/004021 includes a sliding displacement drive device for driving the sliding displacement device in the weft direction, and the sliding displacement device is provided with at least one guide means. The effect yarn can be displaced in the weft direction by the sliding displacement device and can be positioned in the vertical direction.

  In fabrics with additional weft effects, the end of the weft thread is now additionally tucked into the woven shed, ie tucked in, in order to form a so-called tuck-in, i.e. tuck-in, i.e. a tucked ear. .

  Fabrics with tucked ears and devices for forming such tucked ears are known, inter alia, from EP 0149696, JP 2-112446 and US Pat. No. 5,158,119. Yes.

  These documents disclose that the inserted weft is gripped or engaged by the holding means. The holding means then carries the weft yarn to the cutting position. The cut weft end is then gripped or engaged by tacking means (eg, a needle having a heel or a thread eyelet) and inserted into a weaving shed, ie, tucked in.

  In a weaving pattern with an additional weft effect, usually two weft yarns that are in contact with each other in the woven fabric will constitute a connection point or an interlace point with the effect yarn. For this purpose, each effect yarn must be positioned vertically and in the weft direction between two successive weft yarns that are consecutive in the fabric. However, since the machine rotation speed increases, the time for positioning the guide means is always small. Nevertheless, in order to be able to carry the effect yarn to the correct position between the joining points or interlace points between two weft yarns that continue in succession in the fabric, two operating cycles with weft insertion are required. In between, an operating cycle without weft insertion is provided. However, several problems arise when these fabrics further include embedded, or tucked, ears. The cut end of the last inserted weft is tucked into the weaving hook, beaten with a weaving hook, and tacked if the inserted weft does not exist in this weaving hook It has been found that the ears are uneven or uneven.

  It is an object of the present invention to provide a method by which fabrics with good ears with additional weft effect and tack can be produced.

  This object is achieved by a method according to the independent claims.

  In the present method, in which the weft ends are tucked into the weaving shed of the loom, the weft shed is formed by opening means for moving the warp vertically in a known manner. In this method, the weft is selected by the weft selection means before each weft insertion. The weft selection means may be electromechanical or electropneumatic and is well known to those skilled in the art. In the present method, since the first weft insertion is performed after the formation of the weaving shed, the weft insertion means is present in the loom, which is a known mechanical or pneumatic weft insertion means. The first weft is beaten against the cloth edge, that is, before weaving, using a weaving and tacking device.

  The beaten first weft is then held at a position within the cloth ear region by the weft holding means. This holding means may be, for example, a machine thread clamp or a thread guide element. However, an air jet nozzle that holds the yarn in place can also be used.

  After weft insertion (that is, immediately before or after weaving and weaving), the weaving shed is changed, and the position of the warp is changed from the upper part to the lower part by the opening means. In this method, since the first weft is slid by the weft holding means, the holding means is a mechanical operation or a pneumatic operation. They may be, for example, a cam drive that operates an air jet nozzle, a linear motor or an air valve. Due to the sliding displacement, the first weft comes to a position where it is cut by the weft shearing machine. The first weft end appears and is then gripped or engaged by the tacking means. The tack means may be a tack needle having a thread hook or a thread eyelet, but may be an air jet nozzle that engages the first weft end with an air jet.

  Next, using the tucking means, the first weft end is inserted into the weaving shed, that is, tucked in.

  In this method, the second weft is further selected using the weft selection means.

  The second weft is inserted into the weaving shed by the weft insertion means. Next, the second weft is beaten against the pre-weaving together with the first weft end by the weaving and scissor device. The beaten second weft is then held at a position in the cloth ear region by the weft holding means. After insertion of the weft yarn (that is, immediately before or after the weaving lashing), the warp position is changed from the upper part to the lower part by the opening means, and a new weaving shed is formed.

  Next, the second weft is slid and displaced by the weft holding means.

  In this sliding displacement, the second weft comes to a position where it is cut by the weft shearing machine. After the second weft end portion appears, the second yarn end portion is gripped or engaged by the tack means. Next, the second weft end portion is put into the weaving shed by tack means, that is, tucked in.

  In this method, further weaving is performed by the weaving kite device between the two weft insertion steps in which the first and second wefts are continuous, so that the weft is not beaten against the front of the weaving. It is characterized by. It is achieved in that no further weft is inserted into the weaving shed after the previous weaving lashing. Thus, for example, the weft selection means operates so that weft insertion is not performed for one operating cycle of the loom. In this way, in the present method, a so-called missing weft or an operating cycle with no pick or empty pick is performed. In this respect, the period between the two weaving hammers is the operating cycle of the loom.

  Thereby, the main drive shaft of the loom makes one complete rotation.

  The method according to the invention further provides that the effect yarn extending in the warp direction slides and displaces in the weft direction on the loom during two successive weft insertion steps of the first and second weft yarns. The weft direction is the direction in which the weft is inserted.

  The discussion made in connection with the present invention relates to the method or process sequence in a normal weaving operation, i.e. the formation of a normal weaving pattern in an operating weaving machine, not just a malfunction or failure.

  In this way, the method according to the invention thus permanently replaces the empty pick and the normal weft insertion over a number of weft insertions, so that the weft ends are tucked into the weft shed where no weft is inserted. It also includes methods that are not.

  For the sliding displacement process, for example, a sliding displacement device having effect yarn guiding means already known from the prior art can be used.

  Weaving pattern formation including a sliding displacement process and a tuck-in process can be performed using a data set via a controller of a loom according to, for example, International Publication No. 2012/004021. In that respect, pattern-controlled activation of the weft holding means can be realized by inserting additional data values into the background of the respective woven or interlaced pattern. For an empty pick, the holding means operates so that the weft is not cut by the tack means and can be gripped. This can be done, for example, through actuation of electromagnetic means in a cam drive. For example, the next roller of the cam drive can be lifted away from the cam disk as needed depending on the weaving interlace pattern by an electromagnet that engages the roller lever of the cam drive. Thereby, the weft thread remains in the pre-weaving position by the holding means, where it cannot be gripped or engaged by the tack means. The tucking means itself (for example a hook or tuck needle controlled through a cam drive) can thus be further operated even in operation with an empty pick (ie without insertion of the weft), so that the weft end is tucked in. Not.

FIG. 2 is a partial view showing a loom for performing the method. FIG. 2 is a partial view showing a loom for performing the method.

  1 and 2 are partial views showing a loom for carrying out the method. The loom includes an opening driving device 9 for driving the opening means 4, and by its vertical movement, weaving sheds 1.1 and 1.2 delimited by the warp 1 are formed. In fact, the opening drive 9 known to those skilled in the art as such is from a set of levers and rods which are arranged under the opening means 4 and which transmit the drive action of the opening machine 23 to the opening means 4. For example, it may be configured.

  In this embodiment, the opening means 4 is formed of a known heel frame having a heel, and the warp 1 is guided through the eyelet. In addition, there is a device for inserting the weft 3 into the weft direction 1.1, 1.2 in the weft direction 12. In the embodiment of FIGS. 1 and 2, a device with a gripper is illustrated, but is known in the weaving sheds 1.1, 1.2 from both sides of the loom by a transmission and two drive wheels (not shown). Indented in the way. In this embodiment, the weft 3 is supplied from the weft bobbin to one of the two grippers via the prewinder and the weft type selection device 19 and passed to the other gripper at the machine center. Of course, it is also conceivable to use different weft types for different operating cycles. The selection and presentation of the weft 3 to the gripper is performed using, for example, a weft type weft selection device 19. Such embodiments are known to those skilled in the art. The loom control device 8 further includes an input means 21 and a memory means 22.

  Of course, the weft insertion device may be embodied as a woven shuttle, a projectile or a pneumatic weft insertion device.

  In the loom according to FIGS. 1 and 2, there are further weaving scissors 7, 7.1, 10 for striking the weft 3 against the fabric edge, ie the pre-weaving 13, which weaving scissors That is, it consists of a woven cocoon support 10 having ridges 7 and heel bands 7.1. This weaving tooth 7 forms a receiving space, that is, a so-called heel gap 14 that is open toward the top on one side between each other. As a result, the yarn extending in the direction of the warp 1 from the rear to the front of the loom From the upper part, it is possible to enter this heel gap 14 and is thus guided in the weft direction 12 by the weaving lashes. The weaving scissors 7 are secured to the weaving scissor support 10 via the scissor band 7.1 and together with the weaving scissors support perform the beating operation 15-15.1 in each operation cycle of the loom. Finally, in the present embodiment example according to FIGS. 1 and 2, the displacement moving device 5 having the prism guiding device is arranged or attached to the frame of the frame, and the three guiding means 11 are arranged with respect to the displacement moving device. That is, the three effect yarns 2 can be slid and displaced between the distances A in the weft direction 12 by being attached.

  In this example embodiment, a needle 18 having a thread eyelet is used as the guide means 11 and one or more ends of one or more of these needles are secured to a needle beam. This needle beam forms a displacement moving device 5 together with a prism-shaped linear guide device extending in the weft direction 12, and is fixed to the front side of the collar frame as a displacement driving device 6 together with the electric motor driving device. A linear drive device is provided as the displacement drive device 6, and the stator thereof is incorporated in the frame portion of the frame or the prism-shaped linear guide device.

  Through the displacement driving device 6 that drives the displacement moving device 5, the displacement distance A of the effect yarn 2 can be defined in each operation cycle of the loom. The respective displacement distance A can be derived from the data set via the control device 8 and the displacement drive device 6 for each operation cycle of the loom. A computer program executed in the control device 8 calculates the displacement distance A from the data set. The values for the operation of the weft selection means and the values for the operation of the means for holding and tacking the wefts can likewise be stored in the data set.

Claims (1)

A method of tucking the weft end into a weaving shed of a loom,
The weaving shed is formed by opening means for moving the warp vertically,
The first weft is selected by the weft selection means, the selected first weft is inserted into the weaving shed by the weft insertion means, and beaten against the pre-weaving by the weaving scissor device,
The first weft that has been beaten is held at a certain position in the region of the cloth ear by the holding means of the weft,
After weft insertion, the opening means is used to change the weaving shed,
The first weft is further displaced by the holding means of the weft so as to come to a position where it is cut by a weft shearing machine,
The first weft end portion appears and is gripped by the tucking means, whereby the first weft end portion is tucked into the weaving shed, and the second weft is selected by the weft selection means, When the weft insertion means inserts the second weft into the weft shed, the second weft is beaten against the front of the weave by the weaving dredge device together with the first weft end, and then the second weft is beaten. Is held at a certain position in the area of the cloth ear by the weft holding means,
After weft insertion, the opening means is used to change the weaving shed,
The second weft is displaced by the holding means of the weft at a position where it is cut by the weft shearing machine. As a result, the second weft end appears, and the second weft end that appears appears next by the tacking means. In the method of being gripped and tucked into the weaving shed,
During two weft insertion steps in which the first and second wefts are continuous in a normal weaving operation,
Further weaving and striking is performed by the weaving and scissor device, but at this time, the weft selection means operates so that the weft is not inserted and is not beaten against the front of the weaving,
The weft holding means is operated so that the yarn end of the first insertion weft is not tucked into the weaving shed;
A method characterized in that an effect yarn extending in the warp direction forming an additional weft effect is displaced in the weft direction in the loom by a displacement device.

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