JP2005273076A - Device and method for controlling start of loom - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device for controlling the start of a loom by which one starting method in two or more starting methods comprising a start without weft insertion of carrying out reverse rotation in a prescribed reverse rotation amount determined so that an already woven weft yarn may be released from warp yarns, starting the loom, carrying out the beating without the weft insertion by carrying out the normal rotation in the reversely rotated amount, and starting the weft insertion thereafter, and a normal start, can be carried out selectively so that when an elastic weft yarn is positioned at the cloth fell, the operation may be started by the starting method without accompanying the reverse rotation. <P>SOLUTION: The presence or absence of the elasticity in the weft yarn exposed to the cloth fell is judged from an information corresponding to the selection of the weft yarn, or an information corresponding to the elasticity of the input yarn type in the start control of the loom, and when an operation-starting signal is input, the normal start is carried out when the judged result is the presence of the elasticity. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  This invention is caused by a lack of striking force at the start of operation of the loom by performing a so-called idle driving start in which the weft insertion is started after the reverse operation and the starting operation without the weft insertion before starting the weft insertion. More particularly, the present invention relates to a technique for preventing a fabric defect caused by executing the idle driving start regardless of the characteristics of the weft yarn type.

The loom stops during weaving, and weaving steps are likely to occur when the loom is restarted. Regarding the cause of this weaving step, in the so-called normal start where the weaving machine is started after the operation signal is generated and the weft insertion is started after the beating, the beating force immediately after the start is weaker than during steady operation caused by. On the other hand, when the loom starts up, the locomotive motor is rotated by a predetermined amount in the reverse direction, and then the loom main shaft is started to rotate forward and rotate in the forward rotation direction by approximately the same amount as the previous reverse rotation, accompanied by weft insertion. Patent Document 1 discloses a method of starting a loom called a so-called blanking start in which a kite is knocked in a blanking state and then a weft insertion motion is started. In the loom, these start methods are selectively set according to the weaving stage condition.
JP 61-124651 A

  As described above, by the reverse rotation at the time of restarting the loom, the ear braiding device that supplies the ear braiding yarn for constraining the weft yarn at the end of the woven fabric to improve the ear formation of the fabric is also reversed. For this reason, the weft yarn positioned before weaving at the time of restarting loses the binding force due to the ear braiding yarn or warp at the end. In other words, in a loom employing such a start-up method by idle driving, for example, when a weft having a contracting force exists in the yarn itself, such as a processed yarn or a twisted yarn, as the weft, along with the reverse rotation at the start of the above-described There is a problem that the weft yarn itself contracts due to the fact that the weft yarn positioned before weaving is no longer restrained by the warp or the ear braiding yarn, causing a fabric defect.

  Accordingly, an object of the present invention is a loom capable of selectively executing any one of a plurality of start methods including an idle start with reverse rotation and a normal start at the start of operation of the loom. In the case of using stretchable wefts, the loom is started by the start method without reverse rotation as the loom start method.

Means for solving the problems, effects of the invention

  Therefore, in the present invention, one of a plurality of start methods is selected, and a control unit that operates the loom according to the selected start method according to the input of the operation signal, and a plurality of units according to the weft selection information during the loom operation. A weft insertion control unit that selectively wefts one of the types of weft yarns, and the plurality of start methods involve reversing the loom spindle by a predetermined amount and then starting the loom while weft insertion is performed. It includes a blanking start in which hammering is started and then weft insertion is started, and a normal start, and the reverse rotation amount of the blanking start is set so that the weft yarn located before weaving is released from the warp. A loom start control device is provided. Further, according to the present invention, when a driving operation signal is generated, the presence / absence of stretchability of the weft located before weaving is determined according to information relating to the selection of the weft, and when the determination result is stretchable, a normal start is executed. It is set as the summary of 1. Here, regarding the information related to the selection of the weft thread, more specifically, in addition to the weft thread selection information, a weft insertion pick number (count value) from which the weft selection signal is generated can be considered.

  The information about the stretchability of the weft includes information directly indicating the stretchability, such as the direction of twisting, the number of twists per unit length, and the presence or absence of stretch processing, as well as these information such as the part number of the weft supply body. Contains information that is reflected indirectly. The information about the stretchability of the weft includes information indicating the degree of stretchability in addition to the presence / absence of stretchability, and the criteria for stretchability are appropriately determined within a range where no fabric defects occur according to the type. That's fine. In addition, the information on stretchability is automatically set via a connected loom management computer in addition to being read via a storage medium such as a memory card that is manually input by an operator.

  According to the first aspect, even in a multicolor weft insertion loom in which a plurality of types of wefts are selectively inserted according to the weft selection information corresponding to the weft insertion pick number, when the operation signal is generated, The presence / absence of stretchability of the front weft can be determined from the weft selection signal or the weft insertion pick number, which is information related to weft selection. Therefore, when the loom driving operation signal is generated, based on the above determination result, when the weft has stretchability, it is possible to execute a normal start without reverse rotation instead of an idle driving start with reverse rotation, and conversely, When the weft is not stretchable, it is possible to execute either an idle start with reverse rotation or a normal start. By doing so, it is possible to prevent the occurrence of a fabric defect due to the shrinkage of the weft having elasticity that is released from the warp with the reverse rotation of the loom main shaft at the start of operation by performing the idle driving start.

  In the first gist, the operation by the normal start that is executed instead of the idling start is performed manually, that is, the operator views the determination result, and corresponds to a plurality of operation buttons corresponding to the start method. The loom may be operated by pressing the operation button. Further, whether or not the idle driving start is automatically determined by depressing the operator's operation button, and the loom may be operated by the start method corresponding to the determination result. As a means for realizing the latter more specifically, the control unit determines whether or not the weft located before weaving is stretchable according to the information related to the weft selection when the operation signal is input, and the determination result is stretchable. A normal start is executed at It should be noted that the start method when the determination result indicates that the weft yarn is not stretchable can be either an empty start or a normal start, and therefore may be selectively set according to the fabric specification.

  Further, in the present invention, the selection information for selecting one of a plurality of start methods and the setting unit for inputting information on the weft stretchability, and the loom according to the selected start method in accordance with the input of the operation signal. A plurality of start methods, wherein the loom main shaft is reversed by a predetermined amount, and then the loom is started, while the loom is driven without the weft insertion, and then the empty driving for starting the weft insertion is started. The loom start control device includes a start control device for a loom, which includes a start and a normal start, and the amount of reverse rotation of the idle driving start is set so that the weft yarn located before weaving is released from the warp. Furthermore, in the present invention, a second gist is that either the setting unit or the control unit determines whether or not the idle driving start can be selected based on the input information on the stretchability of the weft. According to the second aspect, it is possible to automatically determine whether or not it is possible to select the idling start based on the information on the stretchability of the weft input to the setting unit. Therefore, when a stretchable weft is used, it is possible to execute a normal start which is a start method other than the idle start corresponding to the determination result, and as in the first aspect, It is possible to prevent the occurrence of the above-mentioned fabric defect due to the shrinkage of the weft due to the execution of the idling start (that is, the reversal of the main shaft of the loom) which has occurred conventionally.

  It is also possible to display the determination result information obtained in the first or second gist in a form that is visible through the setting unit. For example, regarding the first gist, the operator recognizes an error in the start method by indicating that the weft located before weaving is stretchable, or that the selection of the blank run start is inappropriate. It is possible to correct the setting of the or to perform manual operation with a start method other than idle driving. Therefore, checking the determination result information is preferable in terms of fabric quality management.

  With regard to the normal start set above, for example, (1) a first start in which weaving is started from the current operation position and the weft insertion is started after the first strike, and (2) the loom is started from the current operation position. It includes at least one of the second start to be started after starting the weft insertion for the first time, and specifically, any one or all of (1) to (2) listed above can do. For example, in the latter case, as a means for selecting one from two or more, a method such as selecting a predetermined one or selecting a suitable one according to a predetermined algorithm based on a set weaving condition can be considered.

(1) First Example Hereinafter, specific modes for carrying out the present invention will be described with reference to the drawings. FIG. 1 shows a two-color weft insertion air jet loom 10 that selectively wefts two types of wefts corresponding to the number of weft insertion picks.

  The loom 10 includes yarn feeders 12a and 12b for supplying weft yarns 11a and 11b, weft length measuring devices 13a and 13b, and locking pins 14a and 14b attached to the weft yarn measuring devices 13a and 13b. Main nozzles 15a, 15b for inserting wefts by injection, and a plurality of sub nozzles 16, 16,... Arranged in the warp opening 21 in the course of the weft flight path and for energizing the flying wefts 11a, 11b by air injection. . The main nozzles 15a and 15b are respectively connected to pressure regulators 18 and 18 configured by, for example, electro-pneumatic proportional valves or the like via electromagnetic open / close valves 17 and 17 and air tanks (not shown) provided correspondingly. In addition, the sub nozzles 16 in the weft flight path are divided into a plurality of groups along the weft insertion direction, and the electromagnetic on-off valves 17, 17... Each is connected to a corresponding pressure regulating device 18. Each of the pressure regulating devices 18, 18... Is connected to a fluid supply source 19 that is provided in common to supply compressed air. It should be noted that various devices such as a warp opening device (not shown), a reed 22 and a yarn feeding cutter 26 are connected to the main shaft 20 of the loom 10 via a motion conversion mechanism (not shown), in the vicinity of the weft end on the opposite weft insertion side. The weft feeler 25 for detecting the weft is disposed opposite the weft flight path.

  With respect to the weft length measuring devices 13a and 13b, for example, the yarn guide is rotated, and the weft yarns 11a and 11b are wound and stored on the drum circumferential surface, and the locking pins 14a and 14b are made retractable with respect to the drum circumferential surface. The device of the type which latches by is shown. When the weft 11a is selected, when the warp is opened, the weft insertion control unit 28, which will be described later, can unwind the previously wound weft 11a with the locking pin 14a on the side corresponding to the selected weft being retracted. On the other hand, the electromagnetic on-off valves 17, 17... Are driven to open and close, and compressed air is relay-injected from the main nozzle 15a corresponding to the weft and the weft insertion nozzles such as the sub-nozzles 16, 16,. As a result, the selected weft 11a is unwound from the weft length measuring device 13a and inserted as shown. When the weft 11a is unwound from the weft length measuring device 13a by a predetermined number of turns, the weft insertion control unit 28 causes the locking pin 14a to be advanced, and the weft 11a is locked thereto. The weft thread 11 a that has been inserted is eventually beaten by a reed 22 and cut by a yarn feed cutter 26 to become a woven fabric 23. In this way, the wefts 11a and 11b are selectively wefted and woven in order. The above-described air jet loom 10 is an example of a two-color weft insertion loom in which wefts 11a and 11b are selectively wefted according to a weft insertion pattern set in advance for each rotation of the loom. Alternatively, it can be configured as a loom for inserting one color.

  The electromagnetic on-off valves 17, 17..., The weft length measuring devices 13 a and 13 b and the locking pins 14 a and 14 b are connected to the output unit of the weft insertion control unit 28. On the other hand, an angle detector 27 composed of, for example, a rotary encoder is connected to the loom main shaft 20, and the crank angle of the main shaft 20 is output in the form of an electrical signal. The angle signal θ is input to the input unit of the weft insertion control unit 28, and a setting unit 50 for setting information such as a weft insertion condition is connected.

  FIG. 2 shows an internal block diagram of the loom control device 30 constituting the loom start control device according to the present invention. Roughly speaking, the loom control device 30 roughly includes a control unit 32 to which the loom angle signal θ is input, a weft insertion control unit 28 that controls each actuator of the above-described weft insertion device, and sends setting values thereto. The controller 32 also includes a main controller 34 that controls the overall operation of the loom, and outputs a weft selection signal S1 and determines whether or not the idle driving start can be selected. And a determination unit 40.

  Roughly speaking, the determination unit 40 is a step signal generator 41 that generates a forward rotation signal Sf or a reverse rotation signal Sr according to the rotation direction of the main shaft every time the loom main shaft angle θ passes a predetermined angle. And a signal generator 42 that counts the input step signal Sf and step signal Sr and outputs a signal based on the count value as the weft pick number. An angle signal θ is input to the step signal generator 41, and each time the loom passes once through a predetermined angle (for example, 0 °), the forward rotation step signal Sf corresponding to the rotation direction or One pulse of the reverse running signal Sr is output. On the other hand, as will be described in detail later, the signal generator 42 stores a weft selection pattern set via the setting unit 50, and the signal generator 42 inputs two step signals Sf and Sr. The number of pulses can be counted. For this reason, the signal generator 42 increments the weft insertion pick count value by +1 or −1 every time the forward running signal Sf or the reverse running signal Sr is input after passing through a predetermined angle, and is stored. Based on the selection pattern, the weft selection signal S1 corresponding to the pick count value can be output. Such a determination unit 40 functions as a weft selection signal generator, and also functions as a determination circuit that generates the idle start prevention signal S3. This will be described in detail later. Regarding the pick count performed by the signal generator 42, for example, when the step signal Sf is further input in a state where the count value reaches the upper limit value “5”, the signal generator 42 sets the pick count value to 1. On the contrary, when the step signal Sr is further input with the count value being the lower limit value “1”, the count value is returned to “5”.

  The main controller 34 includes, for example, a microcomputer (MPU), a memory for recording software such as a loom control program, and a port for inputting / outputting signals to / from the MPU, which are not shown below. The main controller 34 receives, as inputs, operation buttons 35a, a reverse button 35b, operation buttons of a loom such as a stop button (not shown), a spindle angle signal θ from the angle detector 27, a weft feeler 25, and a warp (not shown). An abnormal signal from a break sensor or the like is received at a port (not shown). Further, the main controller 34 sends, for example, a start signal S6, a reverse rotation signal S7 and a braking command signal S8 to current generators 36 and 37 for outputting currents to the driving motor 38 and the loom brake 39 via a port (not shown). In addition to the output, signals such as the operation signal S4, blank weave command signal S5, and start preparation signal S9 are output to the weft insertion control unit 28, the warp control unit 44, which will be described later, and the weft detection unit 45 to which the weft feeler 25 is connected. To do.

  On the other hand, the setting unit 50 includes a touch panel type setting display 51 having a display function, for example, and can set necessary information for the above-described weft insertion control unit 28, main control device 34, and determination unit 40. In addition, these devices and the setting unit 50 are connected so that information can be transmitted and received. More specifically, with respect to the information set in the setting unit 50, the determination unit 40 is provided with respect to the weft selection information and the weft stretchability set for each weft insertion pick number, and to the weft insertion control unit 28. Main nozzle set for each selected weft yarn type, injection timing of each sub-nozzle, pressure value of compressed air supplied to these nozzles, the amount of rotation of the flyer of the weft length measuring device per weft insertion, that is, the weft winding turn Each setting data related to the weft insertion, such as the number, and the weft locking pin unwinding timing for unwinding the weft, and the start method and each start setting that are selectively set for the main controller 34 Each setting data such as conditions, and further each setting data regarding warp tension control and weft density control such as warp tension, warp beam winding diameter, and weft density for the warp control unit 44 , Respectively included. These pieces of information are automatically set via a connected loom management computer (not shown) in addition to being read via a storage medium such as a memory card (not shown) manually input from the setting display 51 by an operator. The

  During steady operation, the current generator 36 supplies current in response to the output of the start signal S6 from the main controller 34. As a result, the main shaft 20 of the loom is driven to rotate by the driving of the prime motor 38. An angle signal θ corresponding to the rotation is input to the step signal generator 41, the weft insertion control unit 28, and the main controller 34. Since the step signal generator 41 outputs the step signal Sf every time the angle signal θ passes 0 ° every rotation, the signal generator 42 increases the count value of the weft insertion pick number by +1, Based on the pre-stored weft selection pattern, the selection signal CL1 or signal CL2 corresponding to the weft insertion device corresponding to the increased pick number is output as the weft selection signal S1 to the weft insertion control unit 28, and the weft insertion In the control unit 28, each electromagnetic on-off valve 17 and the adjusting valve are adjusted under the conditions (injection start angle, injection end angle, pressure) set in advance for each thread type in order to insert the weft corresponding to the weft selection signal S1. While outputting a drive signal to the pressure device 18, the locking pin 14 and the weft measuring device 13 are driven. The warp control unit 44 detects the warp tension at a predetermined angle during the operation of the loom and rotationally drives a warp beam (not shown) so as to maintain the target warp tension, and also sets the rotational speed of the loom and a predetermined weft density. Thus, it is a well-known apparatus which rotationally drives the winding roll of the woven fabric which is not illustrated.

  Here, with reference to FIG. 3, a series of steps from when the cause of the stoppage occurs until the loom 10 in the steady operation state is operated will be described in detail.

  In the loom 10, weft selection information with a total step number of “5”, more specifically, after a weft thread “4” is picked into the non-stretchable weft thread “a”, the stretchable weft thread “b” is “ Suppose that the weft selection pattern as the weft selection information is set so that the “1” pick weft insertion step is repeatedly executed. For this reason, the setting unit 50 selects selection information of the weft insertion device (main nozzle and weft length measuring device) in which the weft is set for each weft insertion pick number with respect to the signal generator 42 constituting the determination unit 40. Are set in advance in the form of symbols, and such weft selection information (weft selection pattern) is sent to the signal generator 42 and stored, for example, as shown in FIG. In this state, the loom 10 is in operation.

  During normal operation, for example, when the weft insertion pick number is “1”, that is, during weft insertion of the weft a, when a weft insertion error occurs as a cause of stoppage and a weft stop signal is generated, the main controller 34 The operation signal S4 is turned off to drive the prime motor 38 through the current generator 36, and the brake command signal S8 is output to operate the brake 39 via the current generator 37. Stop rotating immediately. Next, the main control device 34 reverses the main shaft 20 to a predetermined angle (300 °) so that the warp opening is in a closed state. The arriving worker operates the reverse rotation button 35b to reverse the main shaft 20 up to 180 ° to remove the weft insertion miss yarn a exposed on the front of the weaving 24, and then presses the reverse rotation button 35b again to rotate the main shaft 20 Is reversed to a predetermined angle (300 °) which is the driving operation position. Next, the operator presses the operation button 35a in order to restart the loom 10.

  By the way, the setting unit 50 sets the weaving condition input of the loom by interactive input between a setting display screen (not shown) displayed on the setting display 51 and the operator, and includes a blanking start and a normal start described later. A plurality of start methods can be selectively set, and prior to the weaving operation, the setting unit 50 selects a blank start as a preferential start method to be selectively set, and also starts a blank shot. Information indicating that a 300 ° start is selected as an alternative start method when it is determined that the selection is inappropriate is stored in advance by the operator.

  In this embodiment, with regard to the detailed setting of the idle driving start set as the preferential starting method, first, the main shaft angle 300 ° which is the current driving operation position is reversed approximately one and a half revolutions and stopped at an angle 120 °. Then, an example is shown in which the loom is set to start the weaving machine (forward rotation) and to perform the empty weaving without weft insertion for one and a half rotations and then to start weft insertion. Further, in the present embodiment, even when the preferential start method set in the setting unit 50 is idle start, it is determined whether or not the weft located before weaving is stretchable when the driving operation signal is input, If the weft has elasticity, the loom is started by executing the 300 ° start, which is a normal start as an alternative start method, in place of the idle start, and the start method is used when the weft does not have elasticity. This is an example of starting the loom by executing the idle driving start according to the setting.

  Therefore, when the operator presses the driving button 35a, the main controller 34 outputs a determination command signal S2 to the determination unit 40, and the determination unit 40 performs a predetermined determination based on this input signal and responds to the determination result. The idle start start signal S3 is output. Main controller 34 selectively starts the loom 10 in response to idling start prevention signal S3 after a predetermined time has elapsed after outputting determination command signal S2, and starts operation of loom 10.

  FIG. 5 shows a processing flow performed by the main controller 34 from when the driving operation signal S0 is input to the main controller 34 until the loom is operated. First, when the driving button 35a is pressed and the driving operation signal S0 is input to the main controller 34, the main controller 34 outputs a determination command signal S2 to the determining unit 40 (Step 1). The start method already set and the detailed setting conditions of the start are read (Step 2). The setting conditions include the amount of reverse rotation (the number of picks to be reversed and the main spindle crank angle at which the reverse rotation is stopped) with respect to the idle driving start. Such setting conditions are preset in the setting unit 50 in advance. Next, the main control device 34 checks whether or not the read setting start method as the preferential start method is an idle start (Step 3). When the blank shot start is set as the setting start method read here (that is, when yes), it is checked whether or not the blank shot start prevention signal S3 from the determination unit 40 is output (Step 4).

  At this Step 4, when the output of the idle driving start prevention signal S3 from the determination unit 40 is off (that is, when it is no), the routine proceeds to the next step, Step 5, and the idle driving set as the preferential starting method Start is executed, and a series of start method selection processes are terminated. When the setting start method is a start method other than the idle start in Step 3, or when the idle start start prevention signal S3 from the determination unit 40 is output on (ie, yes), the process proceeds to Step 6. As an alternative start method, a normal start (300 ° start described later), which is a start method other than an empty start set in advance, is executed, and a series of operation start processes is completed.

  By the way, the signal generator 42 shown in FIG. 2 has an output function of the weft selection signal, and whether or not the weft yarn that has already been woven and positioned before the weaving is elastic, in other words, the start of idle driving It has a function of determining in advance whether or not shrinkage occurs in the weft yarn in the reverse rotation operation in, and outputting an idle driving start prevention signal S3 as a result of this determination. More specifically, the setting unit 50 indicates to the signal generator 42 whether or not there is stretchability information, which is information related to the stretchability of the weft, a weft insertion device (main nozzle, weft length measuring device). ). Accordingly, the signal generator 42 has the main nozzle 15a, which is a weft inserting device of the symbol "a", and the weft measuring device 13a, in which the weft a having no elasticity is set, and the main weighing device of the symbol "b" is a main inserting device. The nozzle 15b and the weft length measuring device 13b can recognize that the stretchable weft b is set.

  When the determination command signal S2 is input from the main controller 34 at the previous Step 1, the signal generator 42 determines, for example, predetermined software from the relationship of the selected weft at the current weft pick number based on the weft selection information. According to the algorithm, it is determined whether or not the blank shot start can be selected, and the blank shot start prevention signal S3 is output. As described above, the pick count value (weft pick number) of the signal generator 42 is synchronized with the rotation of the loom main shaft (such as forward or reverse rotation of the loom main shaft) while the control device 30 is energized. . On the other hand, the loom 10 is stopped at an angle of 300 ° when the weft insertion pick number is “5”. The weft selection signal in this state corresponds to the type of weft yarn that has already been woven and located before weaving. Accordingly, the signal generator 42 assumes that the weft is in the state where the weft insertion pick number is “5” and the elastic weft b is selected. As shown in FIG. 4, it is possible to output the idle start prevention signal S3 to the ON state.

  In this case, of the two types of wefts a and weft b, only the weft b is a stretchable weft, and as is apparent from FIG. 4, the output of the blanking start prevention signal S3 is the weft selection signal CL2. Therefore, it is possible to substitute the output of the selection signal CL2 instead of outputting the blanking start prevention signal S3. However, there are three or more types of weft yarn types, and the number of stretchable wefts is not necessarily one, so it is not a good idea to select a substitute signal each time. Therefore, the algorithm for determining whether or not to select the blanking start is considered in consideration of these circumstances, for example, regardless of the number of weft insertion devices set in the weft insertion device, appropriately. It is desirable to enable output.

  Therefore, in the above embodiment, the main controller 34 reads out that the blank start as the preferential start method is selected in the step 2, and proceeds to Step 4 to output the blank start start prevention signal S3. When turned on, the routine proceeds to Step 6 to execute a 300 ° start, which is a normal start method as an alternative start method.

  When this normal start method of 300 ° start is selected, as shown by a solid line in FIG. 3, it is started from the current driving operation position of 300 °, and after a single strike, the weft insertion pick number Operation of the loom 10 is started so that the weft yarn a corresponding to “1” is inserted.

  For reference, the execution mode of the above-described idling start is illustrated by a dotted line in FIG. First of all, the idle driving start is reversed approximately half a turn from the current driving operation position of 300 ° (one pick before, ie, the weft insertion pick number is “4”, the angle is reversed to 120 °), and then the loom is started forward. The blank weaving command signal S5 is turned on and the weaving is performed in the state where the weft insertion is not performed in one and a half rotations, and the double weaving is performed, and then the blank weaving command signal S5 is turned off. Thus, the weft insertion of the weft a corresponding to the weft insertion pick number “1” is resumed, and the operation of the loom is started. In such a case, in the previous reversing step, the weft with elasticity is obtained when the main shaft 20 of the loom is reversely rotated to start idle driving from the current operation position of 300 ° and becomes the first warp opening state. The problem is that b is released from the warp and the ear braid and shrinks, and a fabric defect occurs. With regard to the main shaft angle at which such weft shrinkage occurs, for example, the opening curve dwell, opening setting conditions such as the warp opening amount and cross timing in the warp opening device, the setting conditions of the ear setting device, and the physical properties of the warp and weft However, as an example of a certain loom, for example, when the cross timing of the warp opening device is 300 °, the main axis angle is actually limited to around 260 °.

  According to the present invention, the preferential start method set via the setting unit 50 is not limited to the weft stretchability even if the operator mistakenly sets the idle driving start without considering the stretchability of the weft. When the input information is stretchable based on the information regarding the loom, the loom is operated by automatically selecting the normal start as an alternative start method instead of the idle start with reverse rotation. Therefore, as a result of executing the blanking start with reversal without considering the presence or absence of stretchability of the weft as in the prior art, the stretched weft b that has already been woven is exposed before weaving and the weft itself shrinks. It is possible to prevent inconvenience that a fabric defect occurs.

  Regarding the above-described embodiment, the setting mode such as the weft selection pattern and the detailed setting related to the selection start (for example, the setting related to the weaving machine start such as the reverse rotation amount in the idle driving start) is not limited to the setting example described above, but can be freely set according to the fabric specification. Can be set.

  Variations of the above embodiment are possible below. In the above example, weft selection information (weft selection pattern) is used as the basis for determining the weft elasticity during driving operation. However, the present invention is not limited to this. For example, the weft yarn having strong elasticity stretches somewhat between the end of jetting of the weft insertion nozzle and the time it is beaten. Such weft shrinkage is directly detected by using the yarn signal from the weft feeler 25 and stored for each weft insertion pick, which is used in place of the weft selection information in the above embodiment. May be. The method for detecting weft shrinkage is not specifically limited.

  Regarding the stretchability of the weft, in addition to the presence or absence of stretchability, the degree of stretchability (size of shrinkage per unit length) may be used as a scale. When the degree of stretchability is taken as a scale, the determination criterion may be appropriately determined depending on whether or not a fabric defect occurs due to shrinkage of the weft.

  In the above embodiment, an example of generating an empty start start signal based on the weft selection information and the information on the presence / absence of stretch of the weft is shown. For example, in the case of a two-color weft insertion loom, two types of wefts are alternately wefted. A weft insertion device with a relatively short number of steps, such as over 1 color (ie, 1 × 1), over 2 colors (2 × 2), etc., and a stretchable weft is set to either one In this case, the idle driving start prevention signal S3 can be substituted by a weft selection signal S1 (any one of CL1, CL2,...) Corresponding to the fixed side. Further, instead of using the weft selection signal S1, the idle driving start prevention signal S3 is output based on regularity such as information on the basis of the weft selection signal, for example, whether the weft insertion pick number is even or odd. You may comprise as follows. In other words, it is possible to determine whether or not it is possible to select the idle driving start only based on the weft selection information without using the information on the presence or absence of the weft stretchability.

  Conversely, it is also possible to generate the idle driving start prevention signal S3 only by the information relating to the weft stretchability that is input. That is, the signal generator 42 of the determination unit 40 receives the information on the stretchability of the weft from the setting unit 50, and determines that at least one of the plurality of types of wefts is stretchable. The signal S3 can be output, and the loom is operated by performing a normal start as an alternative start method regardless of the setting of the preferential start method selectively set by the setting unit 50. Can do.

  Now, modifications of the first embodiment described above can be considered. In the above embodiment, when the weft located before weaving at the time when the driving operation signal is generated is not stretchable, an example is shown in which an empty start is set as a so-called preferential start method, but a normal start is executed. The start method corresponding to the non-stretchable weft can be selected from either the idle start or normal start which is other start method in consideration of the actual weaving stage condition, etc. Just execute.

  In the first embodiment, in contrast to one preferential starting method set in advance in the setting unit 50, a predetermined starting method is set in place of the preferential starting method according to the determination result regarding the stretchability of the weft located before weaving. This is an example of performing an alternative start method. However, other embodiments of the specific method for selectively executing such a start method are also conceivable. As one form thereof, for example, a start method that is executed when a driving operation signal is generated is set in advance in the setting unit 50 for each weft insertion pick number in consideration of the stretchability of the weft yarn positioned before weaving. When the signal is generated, the control unit 32 may specify the weft insertion pick number and start the operation of the loom by a start method corresponding to the specified pick number. As described above, the weft insertion pick number is updated in synchronization with the main shaft rotation such as operation of the loom or reverse rotation. Therefore, when the driving operation signal is generated, the use of the weft pick number at that time is also the first gist of the present invention, which is the first gist of the present invention. It is included in determining according to information.

  Further, in the above embodiment, the determination as to whether the weft located before weaving is stretchable or not is performed when the driving operation signal S0 is generated. However, depending on the cause of the stoppage, the operation position of the loom (the operation of the reversing amount of the loom spindle for repair work such as a weft insertion error) may be uniquely determined. Estimate the position (spindle angle) to be operated based on the type of stop cause signal before (more specifically, from when the stop cause signal is generated to when the drive operation signal is generated) However, it is also possible to make a determination from the relationship with the weft selection information as in the above-described embodiment, and any timing for determining the presence or absence of stretchability may be used. The cause of the stoppage can be classified into, for example, those caused by a weft trouble such as a weft insertion error and those other than the weft trouble such as a warp breakage or a stop button. This is because the amount of rotation (reverse amount) of the loom main shaft that is performed for the subsequent repair work differs depending on whether the cause of the stoppage is due to a weft trouble or a case other than the weft trouble. More specifically, When a weft trouble occurs, the machine is operated after a manual reversal of one or more rotations to remove the weft insertion error thread from the standby angle (300 °) when the loom stops. At the time of occurrence, the operation is performed as it is from the standby angle (300 °) when the loom stops.

  In the above-described embodiment, it is an example in which the normal start is automatically selected instead of the idle driving according to the determination result of the weft selection information and the weft yarn type, but instead of performing such automatic processing, It is also possible to output an alarm indicating that there is a risk of fabric defects due to weft shrinkage. For example, as such an alarm, a dedicated warning lamp is turned on, or an alarm message stating “There is a risk of fabric defects due to reverse rotation due to the start of idle driving” is displayed on the setting display 51 of the setting unit 50. It is also possible to alert the worker. The operator who sees this, instead of the idle start with reverse rotation, operates the normal operation button by operating the operation button only for normal start, or sets the setting of the selective setting start method to normal start. It can also be fixed.

(2) Second Example Hereinafter, another specific embodiment for carrying out the present invention will be described. In the first embodiment, the control unit 32 that controls the loom implements the normal start as an alternative start method from the preferential start method. This is realized by the function of the unit 50 side. More specifically, when the operator sets the weaving conditions of the loom, information regarding the stretchability of the weft is input first, and the setting unit 50 determines whether the weft is stretchable or not. This is an example in which only the normal start can be set by excluding the above-mentioned idling start with reverse rotation from the list of setting start methods. Since the circuit configuration for realizing the present invention is almost the same as that of FIG. 2 except that the output of the idle start prevention signal S3 is omitted, the description of the circuit is omitted.

  FIG. 6 shows a part of the processing flow performed by the setting unit 50 when the operator sets the weaving conditions. First, the operator operates the setting unit 50 to input weft yarn type information (Step 1). The weft yarn type information input at this time includes, for example, information on the type of weft, the presence / absence of stretch processing, and the presence / absence of stretch such as the number of twists. When the thread type information setting for the plurality of wefts to be set is completed, the setting unit 50 proceeds to the next step, determines whether or not there is stretchability according to a predetermined algorithm, and if there is stretchability, sets the corresponding stretch flag. In the on state, otherwise, the stretchable flag is turned off (Step 2). Next, the setting unit 50 determines whether or not the stretch flag is on (Step 3). When the stretch flag is off (that is, when it is no), the setting unit 50 proceeds to the selection screen display of the loom start method and selects it. Both empty start and normal start are displayed as a selection menu of possible start methods (Step 4). Therefore, when the worker inputs to select one of the two displayed start methods (Step 5), the setting unit 50 displays a detailed condition input screen corresponding to the set start method. The person inputs necessary information (Step 6), and when this input is completed, the process proceeds to a process for inputting other weaving conditions such as weft insertion conditions (Step 7), and a series related to selective setting of the start method. Terminate the process.

  On the other hand, when the stretchable flag is in the ON state (ie, yes) in the previous Step 3, it is determined that the idle start cannot be selected, and the normal start is the 300 ° start as the selection start method. (Step 8). Next, the setting unit 50 displays a detailed condition input screen corresponding to the normal start, so that the operator inputs necessary information (Step 6). When this input is completed, the process proceeds to a process for inputting other weaving conditions such as weft insertion conditions (Step 7), and a series of processes related to the selective setting of the start method is completed.

  In this way, when the information about the weft stretchability is input first, and the input information is stretchable based on the input information, the setting unit 50 selects the idle start with reverse rotation from the selectable start methods. By removing from the selection list, the normal start method is selected and confirmed as the loom start method. Therefore, even if the operator does not consider the presence / absence of stretch of the weft, there is no possibility that the idle start is erroneously selectively set. As a result of executing the start-up, it is possible to prevent the disadvantage that the stretched weft b already woven is exposed before weaving and the weft itself shrinks, resulting in a fabric defect. Accordingly, it is possible to prevent the problem that the quality of the fabric is deteriorated over a long period until the worker or the inspection person notices the fabric defect due to the erroneous setting of the start method.

  Variations can be considered for the first and second embodiments described above.

  In the above embodiment, a 300 ° start is used as a normal start as an alternative start method, but this start method starts the loom from the current driving operation position (angle 300 °) and beats the strike (angle 0 °). ) Is the starting method to start weft insertion after passing. However, the driving operation position (standby angle) is not limited to 300 °. For example, the driving operation position does not necessarily have to be before the strike timing, and can be determined thereafter. For example, as shown in FIG. 7, the weaving standby angle when the loom stops is 60 °, the operation position is 60 °, and the loom is started from the current operation position to start weft insertion. It can also be a starting method. This is because, in the case of a twill structure such as a woven structure 2/1, 3/1 or the like, at an angle of 300 °, as a result of any ridge frame being placed in the maximum open state, the pre-weaving position moves up and down. As a countermeasure against such weaving steps, we started with the main shaft angle at which the warp opening is somewhat open in the opening movement direction so that the position before weaving is not moved up and down. It is preferable that the warp opening is in such a state because the main shaft angle is around 60 °. In this detailed description, the former 300 ° start is an example of the first start, and the latter 60 ° start is an example of the second start. The former and the latter driving operation positions (angles) can be freely set within a range that does not deviate not only from the angle values of 300 °, 60 °, but also in the vicinity thereof.

  In the first and second embodiments described above, only the 300 ° start is set for the normal start as an alternative start method to be selected instead of the idle start, but instead of the 300 ° start. A 60 ° start may be set, and moreover, a plurality of start methods including the above two may be selected. As a selection method, the operator sets in advance a start method to be selected based on past experience or the like, or is input to the setting unit 50 such as weft and warp yarn type information, driving density, and fabric texture. It is also possible to analyze the set data according to a predetermined algorithm, automatically select an appropriate alternative start method, and send it to the control unit as start method selection information.

  More preferably, other weave prevention techniques are used in combination with the above-described embodiments. As another weaving step prevention technique, more specifically, a technique for generating a start preparation signal S9 during the operation of the loom and rotating the take-up roll or the warp beam by a predetermined amount to correct the pre-weaving position can be considered. . Such a technique is used in combination when, for example, the normal start is selected instead of the idling start as described above. Alternatively, it can be used in combination regardless of the start method, and more preferably, the amount of rotation for correcting the pre-weaving position may be set to a different set value at the start of idle driving and at the normal start. .

  In addition, the control unit 32 shown in FIG. 2 includes a main control device 34 that controls the start of the loom, and a determination unit 40 that determines whether or not the idle driving can be started from the information related to the weft selection information and the weft stretchability. Although the circuit configurations are independent from each other, they may be realized by an integrated circuit. Further, the main control device 34 constituting the control unit 32 may be configured to have each processing function on the loom such as a warp control unit and a feeler so that processing is performed by an integrated circuit. You may comprise so that all these processes may be performed by the software to incorporate.

  The embodiment shown in FIG. 1 is an example of a two-color weft insertion loom, but may be applied to a one-color weft insertion loom or a three-color or more weft insertion loom. In the above embodiment, the air jet loom is shown as an example, but the present invention can also be applied to other non-woven looms such as a water jet loom and a rapier loom. Furthermore, the present invention can also be applied to a loom equipped with an automatic repairing device that automatically repairs a stop factor such as a weft insertion error or a thread breakage and restarts.

1 is an overall configuration diagram of an air jet loom to which the present invention is applied. It is a block diagram which shows the internal structure of the control apparatus of the loom of this invention. The loom start control for determining whether or not the idle start can be selected according to the present invention will be described with reference to a series of flows from the cause of the stop when the 300 ° start is selected as the normal start until the loom operation is started. FIG. It is a figure which shows the example of a setting of the weft selection information used as the basis of determination of the possibility of selection of idle driving start in this invention. It is a flowchart which shows the process at the time of the start control of the loom of this invention in which a control part determines whether selection of idle driving start is possible. It is a flowchart which shows the process at the time of a setting part determining whether the selection of a blank shot start is possible in a setting stage in this invention. It is explanatory drawing which shows a series of flow from the time of the cause of a stop when 60 degree start is selected as a normal start by the start control of the loom of this invention until a loom operation is started.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Loom 11a, 11b Weft 12a, 12b Yarn supply body 13a, 13b Weft length measuring device 14a, 14b Locking pin 15a, 15b Main nozzle 16 Sub nozzle 17 Electromagnetic switching valve 18 Pressure regulator 19 Fluid supply source 20 Main shaft 20 Loom main shaft 21 Warp opening 22 ２３ 23 Weaving cloth 24 Pre-weaving 25 Weft feeler 26 Yarn feeding cutter 27 Angle detector 28 Weft insertion control unit 30 Control device 32 Control unit 34 Main control device 35a Operation button 35b Reverse rotation button 36, 37 Current generator 38 Driving force Motor 39 Loom brake 40 Judgment unit 41 Step signal generator 42 Signal generator 44 Warp control unit 45 Weft detection unit 51 Setting indicator a, b Weft S0 Operation operation signal S1, (CL1, CL2) Weft selection signal S2 Determination command Signal S3 Empty start prevention signal S4 Operation signal S5 Empty Ri command signal S6 activation signal S7 reversed signal S8 braking command signal S9 activation preparation signal Sf forward stepping signal Sr reverse stepping signal

Claims (5)

A control unit that selects one of a plurality of start methods and operates the loom according to the selected start method in accordance with the input of the operation operation signal;
A weft insertion control unit that selectively inserts one of a plurality of types of wefts according to the weft selection information during loom operation;
The plurality of start methods include reversing the loom main shaft by a predetermined amount, then starting the loom, whisking without weft insertion, and then starting emptying to start weft insertion, and normal start, In the start control device of the loom, the reverse rotation amount of the idle driving start is set so that the weft yarn located before weaving is released from the warp yarn.
When the operation signal is generated, the presence or absence of stretchability of the weft located before weaving is determined according to the information related to selection of the weft, and when the determination result is stretchable, a normal start is executed. Start control method. A selection unit for selecting one of a plurality of start methods and a setting unit for inputting information on the stretchability of the weft,
A control unit for operating the loom according to the selected start method according to the input of the operation signal;
A weft insertion control unit that selectively inserts one of a plurality of types of wefts according to the weft selection information during loom operation;
The plurality of start methods include reversing the loom main shaft by a predetermined amount, then starting the loom, whisking without weft insertion, and then starting emptying to start weft insertion, and normal start, In the start control device of the loom, the reverse rotation amount of the idle driving start is set so that the weft yarn located before weaving is released from the warp yarn.
The control unit determines whether the weft located before weaving is stretchable or not according to the information related to the selection of the weft when the operation signal is input, and executes a normal start when the determination result is stretchable. A loom start control device. A selection unit for selecting one of a plurality of start methods and a setting unit for inputting information on the stretchability of the weft,
A control unit for operating the loom according to the selected start method according to the input of the operation signal,
The plurality of start methods include reversing the loom main shaft by a predetermined amount, then starting the loom, whisking without weft insertion, and then starting emptying to start weft insertion, and normal start, In the start control device of the loom, the reverse rotation amount of the idle driving start is set so that the weft yarn located before weaving is released from the warp yarn.
Either of the setting unit or the control unit determines whether or not the idle driving start can be selected based on the input information about the stretchability of the weft, and the start control device for a loom.   The loom start control method or the loom start control device according to any one of claims 1 to 3, wherein the setting unit displays the determination information in a visually recognizable form. 5. The loom start control method or the loom start control device according to claim 1, wherein the normal start method includes at least one of the following.
(1) The first start in which weft insertion starts after the loom is started from the current operation position and first beaten;
(2) A second start in which the loom is started from the current driving operation position and then strikes after first weft insertion;

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