JP2007113140A - Rapier loom - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rapier loom accurately aligning a weft yarn and utilizing a mark such as dyeing forming a striped pattern applied to the weft yarn for aligning the weft yarn by simple constitution without requiring a selvedge mark. <P>SOLUTION: The weft yarn a is dyed according to the pattern of a woven fabric and has some changes of color. When the changes Y of the color are detected, a sensor 35 is set near the position of each Y. When the weft yarn a starts running in front of the sensor 35, the change Y passes in front of the sensor 35. Thereby, the change Y of the color is detected by the sensor 35. The distance from the sensor 35 to X is constant. Thereby, the change Y of the color is detected by the sensor 35. When the main shaft is rotated by a prescribed angle of rotation, a collision piece 21a of a releasing apparatus 21 taps a gripper 20 to release the weft yarn a. As a result, the Y and X can accurately be overlapped. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a rapier loom, and more particularly, to a weft pattern matching technique.

  As a method of weaving a woven fabric having a pattern such as a kite, there is a method of using a pre-dyed yarn for the weft. A pattern is formed by using a weft dyed according to a pattern and driving this weft into a predetermined position. The weft is configured as one unit in which an extra portion called a discard ear is provided on both sides of the woven width. When one weft is inserted into the opening of the warp, the weft is driven by grabbing the part of the throwing ear and moving the weft to the left and right to match the pattern, closing the opening and setting it apart. Originally, this was a field that relied on craftsmanship in the narrow loom handicrafts, but there has been a demand for automation.

  For automation, when weaving long wefts wound around a weft pipe into a shuttle and reciprocating the left and right sides of the fabric as in a normal automatic loom, the above-mentioned wefts cannot be controlled in units of weaving width. , The position of the weft is misaligned and the pattern cannot be formed. Therefore, a method of driving with a shuttleless loom such as a rapier loom was considered. By using a shuttleless loom, it becomes possible to drive a weft that is one unit at the weaving width plus both ears.

  However, even in that case, if the weft is not driven into a predetermined position of the weaving width, the pattern is shifted.

  In order to solve such a problem, Patent Document 1 (Japanese Patent Laid-Open No. 3-14638) proposes the following method as a weft positioning method. That is, wefts with marks on the ears are used, and three sensors for detecting these ear marks are arranged at equal intervals along the running direction of the wefts on the picking side of the rapier loom. On the other hand, on the side where wefts are fed, two guide guides and an idle guide are provided between these guide guides. The guide guide can be moved back and forth in a direction perpendicular to the running direction of the weft. When the weft is driven, the ear mark is detected by one of the three sensors. The position of the weft can be detected depending on which of the three sensors detects the ear mark, but if the center sensor detects the ear mark, the sensor from the woven fabric detects the ear mark. Is going too far. At this time, the idle guide moves in a direction away from the travel path of the weft, whereby the weft can be pulled back. On the contrary, when the sensor is detected by the sensor farthest from the woven fabric, the weft is delayed. In this case, the delay can be corrected by bringing the idle guide closer to the weft running path.

Further, in Patent Document 2 (Japanese Patent Application Laid-Open No. 6-22241), different diameter portions having substantially constant intervals corresponding to the weaving width are provided in the ear portion of the weft, the different diameter portions are detected by a sensor, and two adjacent different diameters are detected. A rapier loom is disclosed in which the length between parts is measured, and the position of the weft is determined by the rotation angle of the crankshaft so that the middle of the different diameter part is located in the middle of the fabric.
Japanese Patent Laid-Open No. 3-146638 Japanese Patent Laid-Open No. 6-2241

  However, the one described in Patent Document 1 sometimes pulls the inserted weft back to the insertion side for pattern matching, which complicates the mechanical structure. In addition, there may be cases where it is not possible to cope with such as when the displacement of the weft is large.

  Moreover, the thing of patent document 2 needs to form the weft with a different diameter part as an ear mark, and the manufacturing process of a weft becomes complicated.

  In addition, there is a method of making a specially dyed portion as an ear mark or using a special paint such as a magnetic material, but the dyeing process becomes complicated, leading to an increase in cost. Further, when a magnetic material is used, there is a problem that dirt is generated in post-processing.

  In view of such circumstances, the present invention can accurately position the weft with a simple configuration, does not require an ear mark, and uses a mark such as a dye for forming a pattern to be attached to the weft for positioning the weft. It is intended to provide a rapier loom that can be used.

  In order to achieve the above object, the rapier loom of the present invention includes a weft supply unit that supplies one or more types of wefts, and a weft that supplies a weft selected from the one or more types of wefts. A weft feeding section, a weft conveying path formed between the weft feeding section and the weft feeding section, a gripper for gripping the weft in the weft feeding section and inserting the weft into the warp opening, A sensor that is provided in the weft conveying path and detects a predesignated mark among marks constituting a fabric pattern attached to the weft, and a predetermined mark after the sensor detects the designated weft mark. A timing measuring unit for measuring timing, a release device for releasing gripping of the weft by the command from the timing measuring unit, a mark designated for each weft, and the sensor, timing measurement Department and release equipment It is characterized by a control unit for controlling.

  The movement of the gripper is synchronized with the rotation of the main shaft of the loom, the timing measurement unit measures the rotation angle of the main shaft, and the control unit outputs a weft release timing signal based on the angle measurement signal of the timing measurement unit. Or the mark constituting the fabric pattern is a change in the color constituting the fabric pattern.

  By selecting one planned weft from one or more kinds of wefts, the gripper grips and moves, so that the wefts are inserted into the warp opening. The weft has a mark such as a color change constituting the pattern of the fabric. The sensor detects the mark and sends a signal to the timing measurement unit. The timing measuring unit measures a predetermined timing after receiving the signal of the sensor, outputs a signal to the release device, and releases the weft from the gripper in which the weft is inserted. Thereby, the weft can be driven into a predetermined position.

  According to the present invention, a color or the like constituting a fabric pattern can be used as a mark, and it is not necessary to apply a special mark, and an ear mark is not necessary. In the present invention, the weft is not inserted into the warp opening and then moved to a predetermined position. Instead, the weft is directly inserted into the warp opening at a predetermined position, so that the mechanism can be simplified.

  According to the present invention, the color or the like constituting the pattern of the fabric is used as a mark. Therefore, even if there is an error in the dyeing position of the weft, it can be adjusted by the length of the ear part on the drawer side. The ears in this case refer to the wefts that are cut when weaving.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  FIG. 1 is a diagram showing a configuration of a main part of a rapier loom. The motor 11 serves as a drive source for the movement of the entire loom excluding the control relationship. The rotation of the motor 11 is transmitted to the main shaft 13 by the belt 12, and the rotation of the main shaft 13 is transmitted to the camshaft 15 via the gear train 14. A groove 15a is formed on the outer periphery of the camshaft 15, and a roller 16a provided on the sector gear 16 is accommodated in the groove 15a. The sector gear 16 can rotate around the rotation shaft 16b.

  The sector gear 16 meshes with the small-diameter gear 17, and the rotation of the small-diameter gear 17 is transmitted to the large-diameter gear 18 that is concentric with and integrated with the small-diameter gear 17. The large-diameter gear 18 reciprocates the gripper band 19 by rotating both left and right in accordance with the swing of the sector gear 16. A gripper 20 is provided at the tip of the gripper band 19. Although not shown, the gripper 20 further has a warp to perform opening and closing operations (not shown). The release device 21 has an electric cylinder. The weft yarn that hits and grips the gripper 20 by moving the collider 21a in parallel with the movement direction of the gripper 20 by the electric cylinder and instantaneously colliding with the gripper 20. Release a. The main shaft 13 is provided with a timing measuring unit 22 composed of a rotary encoder for measuring the rotation angle.

  The movement from the motor 11 to the gripper 20 will be described. When the motor 11 rotates to rotate the camshaft 15 from the main shaft 13 via the gear train 14, the roller 16a moves in the groove 15a and reciprocates in the left-right direction in the figure, whereby the sector gear 16 rotates the rotation shaft. It swings left and right around 16b. This swing is transmitted from the small-diameter gear 17 to the large-diameter gear 18, and the large-diameter gear 18 rotates in the left-right direction to reciprocate the gripper band 19. The gripper 20 reciprocates in the warp opening as the gripper band 19 reciprocates. However, when the large-diameter gear 18 rotates to one side, the gripper 20 goes from one of the warp openings to the other, and grips the weft a here. Then, the weft a is pulled out to the opposite side of the warp opening by the rotation of the large diameter gear 18 to the other side. That is, when the sector gear 16 swings once and again, the gripper 20 inserts one weft into the warp and is beaten.

  The gripper 20 at the time of inserting the weft a travels while gripping the weft a. However, when returning from the left to the right in FIG. 1, the collision element 21 a at the tip of the release device 21 hits the gripper 20. The weft a is released. The insertion position of the weft a is determined at the position where the release device 21 releases the weft a, the weft a stops at the designated position, the warp opening is closed, and the weft a is driven by the scissors. The gripper 20 releases the weft yarn a when it collides with the collider 21a, but continues to move in the same direction and returns to the initial position.

  There are two types of rapier looms: the gripper 20 is only on one side of the loom and the type is on both sides. In the type having only one side, as described above, the gripper 20 goes from one side of the weaving width of the loom to the other side to grip the weft, returns to the start position, and releases the weft grip by the release device 21.

  When the grippers are on both sides, the camshaft 15, the sector gear 16, the small diameter gear 17, the large diameter gear 18, the gripper band 19, and the gripper 20 shown in FIG. 1 are provided symmetrically on the left and right of the loom. And while one gripper 20 grabs the weft a, the other gripper 20 advances from both sides of the loom simultaneously toward the center without the weft a, and passes the weft a to the other gripper 20 at the center. The other gripper 20 returns to the start position, and the release device 21 releases the grip of the weft a.

  FIG. 2 is a diagram schematically showing a weft insertion side in a rapier loom using a plurality of wefts. There are four cheeses 31a, 31b, 31c, 31d in the weft supply section 31, and wefts a1, a2, a3, a4 are drawn from each cheese.

  Each weft a1, a2, a3, a4 passes through the guides 32a, 32b, 32c, 32d of the yarn guide part 32, and is guided to a predetermined position by the selection holders 33a, 33b, 33c, 33d of the weft selection holding part 33. Is done. Each selection holder can advance and retreat in the vertical direction of the figure as indicated by the arrow, and the selected selection holder 33d 'moves the yarn end of the weft a to the yarn feeding position. The gripper 20 comes to the position shown by the arrow b, receives the weft from the selection holder 33d ', and pulls the weft a through the warp opening on the right side of FIG. 2 to the opposite side of the loom.

  The selection holders 33a, 33b, 33c, and 33d are arranged so as to spread to the left and right in the figure, but this is because they are schematically expressed. The position at which the gripper 20 actually receives the weft from the selection holder is No matter which weft is selected, it is received at the same position.

  Between the weft supply part 31 and the yarn guide part 32 shown in FIG. In FIG. 2, the weft conveyance path 34 is linearly provided, but is not limited to a straight line, and a bend may be provided in an arbitrary shape. Further, by setting the length of the weft conveying path 34 to be equal to or greater than the weaving width L, it is possible to detect a color change at an arbitrary position.

  A sensor 35 is provided in the weft transport path 34. As this sensor 35, for example, a photo sensor that receives reflected light from the yarn and detects the change in the color of the weft yarn a and the change in color density from binary to white or black to white is used. can do. In this embodiment, the sensor 35 can freely move between the wefts a1, a2, a3, a4 in the upper and lower directions and the entire length of the woven width L in the left and right, and detects an arbitrary weft a at an arbitrary position. Can be done. A sensor 35 may be installed for each weft a1, a2, a3, a4, and each sensor 35 may be installed so as to be movable by a weaving width L or more in the length direction of each weft a1, a2, a3, a4.

  FIG. 3 is a block diagram of the control system of the rapier loom of the present invention. The control system includes an image analysis unit 51, a control device 52, a servo controller 53, a timing measurement unit 22, and a release device 21.

  The image analysis unit 51 analyzes the output from the sensor 35 and obtains information on whether or not the sensor 35 has detected a target color change (change in color density). The control device 52 has a computer and a program for determining in what order the four wefts a1, a2, a3, and a4 are to be driven, and at which position the color change is detected for each weft. It is memorized.

  When the image analysis unit 51 detects the target color change, the control device 52 converts the distance from the position of the sensor 35 to the position where the detected color change is shot into a predetermined rotation angle to measure timing. A signal is sent to the unit 22. When the main shaft 13 reaches a predetermined rotation angle, the timing measurement unit 22 sends a signal to the servo controller 53, and the servo controller 53 moves the collider 21a of the release device 21 to a predetermined position to release the weft a. .

  FIG. 4 is a schematic view showing a woven fabric and one weft a to be driven next. In the fabric 40 of this embodiment, diagonal stripes (color patterns) are formed. Each weft a1, a2, a3, a4 is dyed so that the pattern of the fabric 40 can be formed. Therefore, the weft a to be driven next is dyed corresponding to the stripe pattern of the tip 40a of the fabric 40. Will be. Reference numerals 40b and 40c denote ears on both sides which are cut off after weft driving.

  Assuming that the n-th weft is a, this weft a has several color changes, and the change at the position indicated by Y in the figure needs to overlap with X at the tip 40a of the fabric 40. A method for positioning the weft a will be described below.

  The control device 52 can recognize from the number of wefts that have been driven so far that the weft a to be driven next time is the n-th weft. Any one of the wefts a1, a2, a3, and a4 is selected as the nth weft a.

  The weft a travels because it is driven, but there is a stopped state before that, and the weft a travels when the gripper 20 grips and moves the tip of the stopped weft a. Therefore, the time when the weft a starts to travel can be considered as the time when the gripper 20 grabs the weft a, and this timing can be displayed as the angle of the rotary encoder as the timing measuring unit 22. Further, when the gripper 20 grips the weft a, the data of the control device 52 is reset.

  When the weft a starts traveling in front of the sensor 35, the change point of Y passes in front of the sensor 35, so the sensor 35 detects the change point Y of this color. As is clear from FIG. 2, the distance from the sensor 35 to X is constant. Therefore, when the sensor 35 detects the color change Y and the main shaft 13 rotates by a certain rotation angle, the collider 21a of the release device 21 hits the gripper 20 to release the weft a. Y and X can be accurately overlapped. The timing when the collider 21a of the releasing device 21 hits the gripper 20 to release the weft a is driven by driving the collider 21a of the releasing device 21 from the servo controller 53 when the main shaft 13 reaches a predetermined rotation angle. Do. That is, when an operation signal is input to the release device 21, the colliding element 21a moves instantaneously and hits the gripper 20 to release the weft a. The weft a stops at the specified position, the warp opening is closed, and the weft a is driven with a scissors (not shown).

  If the weft a is one color and there is no color change, the weft a may be released at a normal timing. The normal timing can be determined by inputting the rotation angle until the gripper 20 grips and releases the weft a to the control device 52 in advance. Accordingly, unlike Patent Document 2, it is not necessary to mark the weft ears with different diameter portions or the like, and the weft production can be simplified.

  Further, according to the present invention, the position of the loom is not adjusted after inserting the weft as in Patent Document 1, but the weft is inserted at a predetermined position, so that the configuration of the loom can be simplified.

  In the embodiment, the sensor 35 detects the color change that forms the pattern of the fabric. However, the sensor 35 is not limited to the color as long as it forms the pattern.

  In FIG. 4, since the sensor 35 is set in the immediate vicinity of the color change Y, the first color change detected by the sensor 35 is Y, but the sensor 35 is moved to the right side of FIG. It is also possible to detect a change of a plurality of colors and set the number of colors to change to Y. In that case, the rotation angle of the main shaft 13 may be set according to the distance from the position of the sensor 35 after the movement to the X position, and the weft a may be released at that angle. With this configuration, the sensor 35 can be fixed without moving in the length direction of the weft yarn a.

It is a figure which shows the structure of the principal part of a rapier loom. It is a figure which shows typically the weft insertion side in the rapier loom which uses a some weft. It is a block diagram of the control system of the rapier loom of the present invention. It is a schematic diagram which shows the fabric and one weft a to be driven next.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Motor 13 Main shaft 20 Gripper 21 Release device 21a Collider 22 Timing measurement part 31 Weft supply part 33 Weft holding part 34 Weft conveyance path 35 Sensor 40 Weaving a Weft

Claims (3)

  A weft supply unit for supplying one or more types of wefts, a weft supply unit for supplying wefts selected from the one or more types of wefts, the weft supply unit and the weft supply unit A weft transport passage formed between the gripper, a gripper for gripping the weft in the weft supply section and inserting the weft into the opening of the warp, and a fabric provided in the weft transport passage and attached to the weft A sensor for detecting a predesignated mark among marks constituting the pattern, a timing measuring section for measuring a predetermined timing after the sensor detects the designated weft mark, and a timing measurement section A release device that causes the gripper to release grip of the weft by a command, and a controller that stores a mark designated for each weft and controls the sensor, the timing measurement unit, and the release device. Repi Loom.   The movement of the gripper is synchronized with the rotation of the main shaft of the loom, the timing measurement unit measures the rotation angle of the main shaft, and the control unit outputs a weft release timing signal based on the angle measurement signal of the timing measurement unit. The rapier loom according to claim 1, wherein   The rapier loom according to claim 1 or 2, wherein the mark constituting the fabric pattern is a change in color constituting the fabric pattern.

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