JP4015578B2 - Hollow fiber membrane knitting device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a hollow fiber membrane knitting device, and more particularly to a knitting device of a Raschel machine that folds and inserts a hollow fiber membrane as a weft into the entire knitting width.
[0002]
[Prior art]
Conventionally, as a hollow fiber membrane knitting device, a hollow fiber membrane knitting device capable of knitting a wide hollow fiber membrane knitted fabric by traversing the hollow fiber membrane at high speed and wide width with low tension that does not damage the hollow fiber membrane. (See, for example, Patent Document 1), and a weft insertion mechanism (see, for example, Patent Document 2) of a Raschel machine that folds and inserts a weft thread over the entire knitting width.
[0003]
As shown in FIG. 5, the one described in Patent Document 1 blows upward the traveling hollow fiber membrane 72 sent from the feed roller 73 together with air by the nozzle 74, and the top position of the parabola of the hollow fiber membrane that falls after being blown up 77, a hollow fiber membrane knitting device is disclosed in which 77 is detected by detection sensors 75 and 76, and the detection signals detected by the detection sensors 75 and 76 are fed back to adjust the speed of the feed roller 73.
[0004]
As a means for adjusting the speed of the feed roller 73, a servo motor (not shown) is used as a drive source of the feed roller 73, and the speed is controlled by feeding back signals from the detection sensors 75 and 76 that have detected the vertex positions. In addition, the feed roller 73 was rotated at a constant speed set slightly faster than the average yarn speed at the time of knitting, and the signals from the detection sensors 75 and 76 that detected the vertex positions were connected to the drive source of the feed roller 73. It is described that speed control is performed by inputting to a powder clutch (not shown) and performing on-off control of the powder clutch.
[0005]
As shown in FIG. 6, the one described in Patent Document 2 is provided with a weft insertion guide 90 separately from the warp knitting guide, and the weft 91 is inserted back into the entire knitting width. As a transmission mechanism for transmitting the rotation of the base shaft 92 of the Raschel machine to the weft insertion guide 90, a lever 94 is connected to one end of a pulley 93 provided on the base shaft 92 to convert the rotational motion into a reciprocating motion, and the required traverse amount A plurality of levers 95 to 100 are installed until the amount of reciprocation is increased.
[0006]
A pulley group 101 is arranged in a circle in accordance with the operation position of the last lever 100, and an endless timing belt 104 hangs between the pulley group 101 and a timing pulley 105 fixed to the drive shaft of the traverse guide drive unit 102. The timing belt 104 transmits the swing motion of the pulley group 101 as the rotation of the timing pulley 105.
[0007]
The rotation of the timing pulley 105 is transmitted to the belt, the timing pulley 106 that drives the traverse guide 108 is rotated, and a pulley (not shown) provided at the other end of the rail 109 that guides the traverse guide 108 and the timing pulley 107 The traverse guide 108 reciprocates along the rail 109 by an endless belt 110 disposed between them.
As a result, the crank mechanism 111 reduces the speed at the turning point of the traverse guide 90, and the stroke amplifying mechanism 112 obtains a long horizontal stroke to constitute the weft insertion mechanism of the Raschel machine.
[0008]
In the hollow fiber membrane knitting device described in Patent Document 1, detection of detecting the apex position by using a servo motor (not shown) as a drive source of the feed roller 73 as means for adjusting the speed of the feed roller 73 Although it is described that the speed is controlled by feeding back signals from the sensors 75 and 76, there is no description that the drive of the servo motor is synchronized with the drive of the main drive shaft in the knitting machine. It is only described that the signals from the detection sensors 75 and 76 that detect the above and the speed control between the servo motors can be performed. There is no particular explanation as to what speed control is actually performed.
[0009]
Further, when the speed control of the feed roller 73 is performed using a powder clutch, an error may occur due to the slipping condition when the powder clutch is driven, and a slight error may occur in the supply amount of the hollow fiber membrane 72. was there.
Furthermore, since only one blowing nozzle 74 that blows up the hollow fiber membrane 72 is disposed, the falling trajectory of the hollow fiber membrane after being blown up is not stable, and the apex position of the hollow fiber membrane is the same. However, the amount of deposition in the air dancer portion varied due to different falling trajectories.
[0010]
In the weft insertion mechanism disclosed in Patent Document 2, the ratio of the stroke amplification mechanism 112 provided for obtaining the traverse amount is about 1/3 of the entire knitting apparatus, so the knitting apparatus must be enlarged. I didn't get it.
In addition, since the inertial force is increased by an enlargement mechanism having a complicated configuration and a large number of connecting portions are provided, the number of rotations cannot be increased due to the structure.
Furthermore, since the stroke amplification mechanism 112 is complicated, the number of maintenance operations is increased, leading to high costs associated with stopping the machine base.
[0011]
As a result, the knitting speed in knitting using a hollow fiber membrane that is weak against tension as a weft can be increased, the knitting work can be performed with any knitting width in a compact manner, and the amount accumulated in the air dancer section It has been desired to develop a hollow fiber membrane knitting device that can stabilize the tension.
[0012]
[Patent Document 1]
JP-A-6-210141 (see paragraphs 0011 to 0016, FIG. 1)
[Patent Document 2]
JP-A-6-101144 (see abstract, paragraphs 0010-0013, 0020, FIGS. 1-8)
[0013]
[Problems to be solved by the invention]
The present invention is to provide a hollow fiber membrane knitting device that can stably supply a hollow fiber membrane to be supplied as a weft and can rapidly knitting a hollow fiber membrane with a desired mesh width. .
[0014]
[Means for Solving the Problems]
The object of the present invention is achieved by each of the inventions described in claims 1 to 7.
That is, in the hollow fiber membrane knitting device according to the present invention, the hollow fiber membrane drawn from the weft bobbin around which the hollow fiber membrane as the weft is wound is sent out by at least one supply roller that is drive-controlled. The traveling hollow fiber membrane is blown up in a substantially parabolic shape by an air dancer portion composed of a pair of nozzles, and then supplied to a traverse guide of a knitting machine that is driven and controlled via a spring-loaded guide.
[0015]
Further, for the supply motor and the traverse motor that drive the supply roller and the traverse guide, respectively, the control device issues a synchronization signal and a drive control signal that are synchronized with the drive of the main drive shaft in the knitting machine, and supplies the supply The drive control signal emitted to the motor is a drive control signal for controlling the supply motor based on the detection signal of the detection means for detecting the apex position of the hollow fiber membrane in the air dancer portion, and the air dancer portion includes an air blower The hollow fiber membrane knitting apparatus is characterized in that the air flow discharged from the air is distributed and the air flow is ejected from each of the pair of nozzles.
[0016]
In this invention, the supply roller that feeds the hollow fiber membrane drawn from the weft bobbin is driven by a supply motor that is driven and controlled by a control device, and the supply motor is synchronized with the drive of the main drive shaft in the knitting machine. While being driven, the speed is controlled by a detection signal that detects the apex position of the hollow fiber membrane in the air dancer portion.
As a result, the supply roller can be driven in synchronism with the drive of the main drive shaft in the knitting machine, and the hollow fiber membrane is supplied in accordance with the apex position of the hollow fiber membrane in the air dancer, that is, the amount of deposition in the air dancer. You will be able to control the amount.
[0017]
One or more rollers are used as the supply roller, and when a plurality of supply rollers are provided, it is desirable to drive each supply roller synchronously by driving a supply motor. At this time, the supply speed of each drive roller can be varied, but by setting the same speed, the tension of the hollow fiber membrane between the supply rollers can be made constant.
By shortening the section in which the hollow fiber membrane travels in the air as much as possible between the supply rollers, the hollow fiber membranes traveling in space can be stably traveled without being scattered.
[0018]
Moreover, in this invention, since the air dancer part is comprised by the air flow which blows off from a pair of nozzles, the hollow fiber membrane performs ascending running by the air flow blown from one nozzle, and from the same nozzle on the other nozzle side It is possible to travel downward against the air flow that is ejected.
Therefore, the shape of the hollow fiber membrane in the air dancer portion can always be formed in a substantially parabolic shape. Thereby, the deposition amount of the hollow fiber membrane in the air dancer portion at the apex position of the hollow fiber membrane can be made constant, and the supply of the hollow fiber membrane to the traverse guide can be stabilized.
[0019]
Furthermore, in the present invention, the traverse guide is driven by a traverse motor that is driven and controlled by a control device. Since the traverse motor is driven in synchronism with the drive of the main drive shaft in the knitting machine, the traverse guide can be moved according to an arbitrary movement curve by a command from the control device.
[0020]
As a method of synchronizing with the drive of the main drive shaft in the knitting machine, the rotation of the main drive shaft is detected using an encoder or the like, and the detected rotation information of the main drive shaft is input to the control device and replaced with an electric signal. This can be done by issuing a synchronization signal. In addition, a synchronization signal synchronized with the drive of the main drive shaft can be generated using a control signal for the drive motor that drives the main drive shaft.
[0021]
In this invention, by providing the above configuration, the knitting apparatus can be collectively controlled in a state synchronized with the drive of the main drive shaft in the knitting machine. Further, the hollow fiber membrane can be fed and run in a stable state from the bobbin to the knitting machine, and even if the hollow fiber membrane is weak against tensile tension and cannot be crushed in the radial direction, The yarn film can be knitted as a weft.
Furthermore, in the reciprocation number of the traverse guide set by inputting the knitting data, the weft traverse motor is stopped in a state where the weft guide has been arranged on one side, and in this state, the chain knitting is performed only by the warp. Organization can be performed.
[0022]
According to a second aspect of the present invention, in addition to the configuration of the first aspect, the spring-loaded guide includes guide members at both ends of the elongated spring member bent in a U-shape, and is upstream from the bent portion. The length to the guide member on the side is shorter than the length from the bent portion to the guide member on the downstream side, and the spring-loaded guide swings around the bent portion in synchronization with the traverse movement of the traverse guide. There is a hollow fiber membrane knitting device with limited matters.
[0023]
According to the present invention, guide members are provided at both ends of the spring-loaded guide bent in a U-shape, and the spring-loaded guide can swing around the bent portion in synchronization with the traverse motion of the traverse guide. When the tension of the hollow fiber membrane supplied to the traverse guide is reduced, that is, when the traverse guide comes to the working end near both ends, the guide members provided at the tip of the bent portion are arranged in substantially the same vertical line. Thus, the tension applied from the spring member to the hollow fiber membrane can be reduced.
Thereby, a tension | tensile_strength can be adjusted to the hollow fiber membrane in a traverse guide, and the knitting operation | work in the vicinity of the both ends of a traverse guide can be performed smoothly.
[0024]
In addition, it is also possible to apply a high tension to the hollow fiber membrane by swinging the guide with the spring around the bent portion immediately before the top position of the hollow fiber membrane in the air dancer portion comes to the lowest end side.
Furthermore, since the swinging of the spring-loaded guide is synchronized with the traverse motion of the traverse guide, the spring member is swung according to the need to apply tension to the hollow fiber membrane or when the tension is reduced. Thus, a desired tension can be applied to the hollow fiber membrane.
[0025]
According to a third aspect of the invention, in addition to the configuration of the first or second aspect, the detection means includes a plurality of detection sensors spaced in the vertical direction, and the detection of the apex position of the hollow fiber membrane detected by the detection sensor. A signal is input to the control device, and the hollow fiber membrane supply speed of the supply roller is set to about 50 ± 10% of the average knitting speed in the knitting machine with respect to the supply motor from the control device according to the detection signal. The hollow fiber membrane knitting apparatus is limited to the matter that generates a drive control signal for controlling the speed of about 115 ± 10% of the average knitting speed and the supply stop.
[0026]
In the present invention, the apex position of the hollow fiber membrane having a substantially parabolic shape in the air dancer portion is detected by a plurality of detection sensors arranged apart from each other in the vertical direction, and the feed speed of the supply roller is controlled by a control device that inputs the detection signal. It is something to control.
When the top position of the hollow fiber membrane is higher than the desired height, the feeding speed of the supply roller is reduced to about 50 ± 10% of the average knitting speed in the knitting machine, and the top position of the hollow fiber membrane is When a position lower than the desired height is reached, the feed speed of the supply roller is increased to about 115 ± 10% of the average knitting speed in the knitting machine.
[0027]
As a result, when the deposition amount of the air dancer portion increases, the supply amount of the hollow fiber membrane supplied to the air dancer portion is reduced without stopping the supply of the hollow fiber membrane by the supply roller, and the desired deposition amount is achieved. When the amount decreases, the supply amount can be increased to quickly achieve a desired deposition amount.
In addition, when the detection sensor placed at the top of the detection sensors arranged in the vertical direction detects an abnormal increase in the deposition amount of the air dancer, or when the detection sensor placed at the lowest position detects the accumulation amount of the air dancer. When it is detected that the number is abnormally small, the control device can avoid the abnormal situation by stopping the supply of the hollow fiber membrane by the supply roller.
[0028]
As the detection sensor, a laser sensor, a wire sensor, an optical fiber sensor, or the like can be used.
In addition, it is desirable to use a laser sensor as the detection sensor disposed above, and to use a wire sensor or an optical fiber sensor as the detection sensor disposed at the uppermost part and / or the lowermost part.
[0029]
Although any number of detection sensors can be arranged, it is desirable to arrange at least two at least on the upper side and two on the lower side, and at least four in total.
In addition, when the apex position of the hollow fiber membrane in the air dancer part B reaches a position indicating a preset abnormal state, in addition to stopping the driving of the supply motor, stop control of the drive system of the knitting apparatus accompanied by stopping the driving of the traverse motor is performed. It is desirable to do.
[0030]
According to a fourth aspect of the present invention, in addition to the configuration of the third aspect, there is a hollow fiber membrane knitting device in which the supply motor is an inverter motor.
In this invention, since the inverter motor is used as the drive source of the supply roller, stable drive control can be performed even at a low voltage, the drive error of the supply roller can be reduced, and the stable hollow fiber membrane Supply can be made.
[0031]
In the invention according to claim 5, in addition to the configuration of claim 1 or 2, the drive control signal for the traverse motor performs speed control by the cycloid curve at the start end and the end end of the traverse motion of the traverse guide, In the hollow fiber membrane knitting apparatus, the matter which is a drive control signal for performing constant speed control in the intermediate part of the traverse motion is limited.
[0032]
In this invention, the traverse guide is caused to perform a traverse motion by controlling the drive of the traverse motor, and the deceleration and acceleration at both ends of the traverse are performed according to the cycloid curve, and the traveling in the intermediate portion of the traverse is performed at a constant speed. Can be made.
[0033]
In the traverse mechanism as described in Patent Document 2, the traverse motion is controlled according to a curve close to the sin curve, whereas in the present invention, speed control according to the cycloid curve can be performed at both ends of the traverse. Since the traverse intermediate portion can be driven at a constant speed, the travel time of the traverse guide can be increased and the working time can be shortened.
[0034]
Moreover, the low speed and stop operation at both ends of the traverse can be performed more smoothly, and the switching from the speed to the constant speed according to the cycloid curve can be performed smoothly. Thereby, the tension | tensile_strength with respect to the hollow fiber membrane at the time of the overwrap knitting in the knitted end part of a hollow fiber membrane can be adjusted correctly and smoothly.
[0035]
The invention according to claim 6 is the hollow fiber membrane knitting device in which the traverse motor is a servo motor in addition to the configuration of claim 5.
In the present invention, since the servo motor is used as the traverse motor, the traverse motion control of the traverse guide can be stably and reliably performed by the control signal from the control device.
[0036]
According to a seventh aspect of the invention, in addition to the matters of the first or second aspect, at least one or more weft bobbins are rotatably arranged on the turntable, and the turntable has a direction perpendicular to the rotation axis of the weft bobbins. A hollow fiber membrane knitting apparatus that limits the matters in which a guide portion that rotates as a rotary shaft and guides a hollow fiber membrane drawn from each weft bobbin is arranged on the upstream side of the supply roller.
[0037]
In the present invention, at least one bobbin is rotatably disposed on a turntable having a rotation axis in a direction perpendicular to the rotation axis of the bobbin, and hollow from each bobbin via the guide member while rotating the turntable. Since the thread membrane can be pulled out, the hollow fiber membranes pulled out from the bobbins can be lightly twisted.
Thereby, it can prevent that hollow fiber membranes leave | separate apart during driving | running | working of a hollow fiber membrane. Further, by providing a brake means on the rotating shaft of the bobbin, the hollow fiber membrane can be pulled out from the bobbin with a constant tension.
[0038]
DETAILED DESCRIPTION OF THE INVENTION
Preferred embodiments of the present invention will be specifically described below with reference to the accompanying drawings. The present invention relates to a knitting apparatus using a hollow fiber membrane as a weft, and can be effectively applied to a weft insertion type Raschel machine.
FIG. 1 shows an overall schematic diagram of the embodiment of the present application. That is, it comprises a supply part A for the hollow fiber membrane 3, an air dancer part B, a knitting machine C, a warp supply part D, and a conveying and deposition part E for the knitted hollow fiber knitted fabric 52.
[0039]
The supply part A of the hollow fiber membrane 3 is configured as follows.
One or more weft bobbins 1 are rotatably supported on the turntable 2 around an axis orthogonal to the rotation axis of the turntable 2 that can rotate. The turntable 2 is rotatably supported on the machine base and is driven to rotate by a driving means (not shown), and can be rotated using a dedicated driving means or a driving means shared with other driven members. Can do.
[0040]
A brake means 57 is interposed on the shaft that supports the weft bobbin 1, and applies a predetermined tension to the hollow fiber membrane 3 rewound from the weft bobbin 1. As the brake means 57, brake means such as an electromagnetic brake, a leaf spring in contact with the rotating shaft, a disc brake, and a belt wound around the rotating shaft can be used.
[0041]
As a brake control method of the weft bobbin 1 by the brake means 57, a required braking force is always applied by a mechanical brake, and when the rotation of the weft bobbin 1 is stopped, the weft bobbin 1 overruns by inertia force and A brake control method can be employed in which the rotation of the weft bobbin 1 is forcibly stopped by an electromagnetic brake or the like so that a certain hollow fiber membrane 3 does not come off the weft bobbin 1.
[0042]
The hollow fiber membrane 3 unwound from the weft bobbin 1 is guided by the weft guide 5 and taken up by the supply roller 6. The hollow fiber membrane 3 drawn out from the plurality of weft bobbins 1 is lightly twisted by the rotation of the turntable 2 and the weft guide 5.
The twisting strength at this time needs to be a light twist so that the hollow portion of the hollow fiber membrane 3 is not crushed by the twist.
[0043]
The hollow fiber membrane 3 taken up by the supply roller 6 is wound around the plurality of supply rollers 6 while being lightly pressed by the nip roller 7 and supplied to the air dancer part B. Each supply roller 6 is rotationally coupled so as to be synchronously rotated by an endless belt 9 or the like, and is driven by an inverter motor as a supply motor 8 that is driven and controlled by a control device 10. Depending on the number and position of the supply rollers 6, a pulley C may be provided to wrap the endless belt 9 between the supply rollers 6.
The supply motor 8 is not limited to an inverter motor, and a control motor such as a pulse motor or a servo motor can be used.
[0044]
The air dancer part B is configured as follows.
The air flow discharged from the air blower 11 is distributed to the bifurcated air ducts 12 and 13, and the air flow is blown upward from the respective nozzles 14 and 15. One air duct 12 is provided with an introduction guide 16 for introducing the hollow fiber membrane 3 delivered from the supply roller 6, and the hollow fiber membrane 3 introduced from the introduction guide 16 is conveyed by an air flow and from the nozzle 14. Blow up.
[0045]
At the time of passing through the hollow fiber membrane 3, the tip of the hollow fiber membrane 3 blown up from the nozzle 14 is folded back in the sky, and then moved downward against the air flow blown out from the nozzle 15, so that the air dancer portion In B, the hollow fiber membrane 3 has a substantially parabolic shape.
[0046]
By enclosing the periphery of the air dancer part B with a partition such as a sheet-like object or a plate-like object and making the upper part a blow-off structure, it is possible to regulate the flow of the air flow 19 inside the enclosed object. The dancer effect as the air dancer part B can be enhanced.
Further, by configuring the partition with a transparent or translucent material, the behavior of the hollow fiber membrane 3 in the air dancer part B can be observed from the outside.
[0047]
Four detection sensors 18 for detecting the apex position of the hollow fiber membrane 3 in the air dancer part B are arranged.
In the embodiment of the present invention shown in FIG. 1, four detection sensors 18 are arranged. However, the number and positions of the detection sensors 18 are not limited to the example shown in FIG. The number can be arranged at a desired position.
[0048]
The detection sensor 18-1 detects the upper limit position of the deposition amount of the hollow fiber membrane 3 in the air dancer part B, and the detection sensor 18-4 detects the lower limit position of the deposition amount of the hollow fiber membrane 3 in the air dancer part B. It is to detect.
When the detection sensor 18-1 or the detection sensor 18-4 detects the apex position of the hollow fiber membrane 3 and the detection signal is input to the control device 10, a drive stop signal is sent from the control device 10 to the supply motor 8. To emit.
[0049]
Thereby, it is possible to prevent the knitting machine C from continuing to operate while the hollow fiber membrane 3 is abnormally deposited in the air dancer portion B or the amount of accumulation is abnormally reduced. After stopping the knitting device, the abnormal state can be recovered by adjusting the yarn feeding system and the like.
[0050]
When the apex position of the hollow fiber membrane in the air dancer portion B is in a position indicating an abnormal state, it is necessary to stop the traveling of the hollow fiber membrane 3 and the hollow fiber membrane knitted fabric in the knitting device in addition to the supply motor 8. is there.
[0051]
The detection sensor 18-2 and the detection sensor 18-3 detect the upper limit side and the lower limit side of the allowable range that can be deposited on the air dancer part B, and the detection sensor 18-2 determines the apex position of the hollow fiber membrane 3. When detected, the control device 10 that has received the detection signal issues a drive control signal to the supply motor 8 so that the supply speed of the supply roller 6 is about 50 ± 10% of the average knitting speed.
[0052]
Further, when the detection sensor 18-3 detects the apex position of the hollow fiber membrane 3, the supply speed of the supply roller 6 from the control device 10 receiving the detection signal to the supply motor 8 is about 115 of the average knitting speed. A drive control signal is issued so that the acceleration speed is ± 10%.
[0053]
Thereby, when the deposition amount in the air dancer part B is increased, the deposition amount can be kept within an appropriate range without applying an abnormal tension to the hollow fiber membrane 3 without rapidly decreasing the deposition amount. It can be done quickly.
Further, when the accumulation amount in the air dancer portion B is reduced, the accumulation amount is appropriately adjusted without suddenly pulling out the hollow fiber membrane 3 from the weft bobbin 1, that is, without applying an abnormal tension to the hollow fiber membrane 3. It is possible to quickly fit within the range.
[0054]
As the detection sensor 18 in the air dancer part B, a light projector and a light receiver facing each other in a direction perpendicular to the paper surface of FIG. As the detection sensor 18, a laser sensor, a wire sensor, an optical fiber sensor, or the like can be used. As the detection sensor 18-4 for detecting an abnormal state, it is desirable to use an optical fiber sensor, and it is desirable to use an optical fiber sensor for the detection sensor 18-1 as required.
[0055]
As the detection sensor, a contact-type sensor such as a wire sensor can be used, but when the contact-type sensor is used, the hollow fiber membrane 3 is in contact with the sensor, so that the hollow fiber membrane 3 is damaged. Because of the danger, it is desirable to use a non-contact type sensor as the detection sensor.
[0056]
In the knitting machine C, the hollow fiber membrane 3 traveling downward from the air dancer part B is guided by guide parts 22 to 24 provided in the guide 21 with spring and introduced into the traverse guide 32. The traverse guide 32 is held by four rollers 35 and reciprocates along the traverse rail 36.
The reciprocating motion is performed by reciprocating an endless belt 39 wound between a driving pulley 37 and a driven pulley 38 by a servo motor 32 which is a traverse motor 30 driven and controlled by the control device 10.
[0057]
The hollow fiber membrane 3 supplied via the spring-loaded guide 21 is traversed by a predetermined width by the reciprocating motion of the traverse guide 32. The knitting needle 56 that moves up and down in synchronization with the traverse hooks the warp yarn 41 supplied from the warp supply unit D to form a chain knitting, and restrains the hollow fiber membrane 3 that is a weft to form a knitted fabric.
[0058]
The hollow fiber membrane 3 in the traverse guide 32 has a feed speed of the hollow fiber membrane 3 that is instantaneously zero at one end, and is gradually accelerated and then travels at a constant speed, and is gradually decelerated near the other end. The feed speed becomes zero at the part. Further, the vehicle is driven at a constant speed after being gradually accelerated, and is gradually decelerated at one end side, and the feed speed becomes zero at one end portion. This feeding operation is repeated.
[0059]
In FIG. 3, the horizontal axis indicates the position when moving from one end of the traverse guide (hereinafter referred to as the L end) to the other end (hereinafter referred to as the R end), and the vertical axis indicates the speed of the action portion (traverse). It is the schematic diagram which showed (speed).
As for the speed control of the traverse guide, as shown by the solid line, the feed speed can be set to zero in the vicinity of one end, and the speed is gradually increased from zero speed to shift to the constant speed running state, and the other end In the vicinity of the part, it is possible to smoothly decelerate from a constant speed to zero speed.
[0060]
Further, knitting with warp can be performed in a state where the speed at the end is zero. For this control, various control inputs can be formulated and set according to the characteristics such as the strength of the film used, etc., but they can be combined and set, but a cycloid curve is expressed for easy input. Use of the control input is a preferable means in that smooth control can be easily input.
[0061]
According to such a servo motor drive system, since the traverse guide drive unit can be installed on the warp guide hanger, the apparatus becomes very compact, and the knitting speed can be increased by reducing the apparatus inertia.
[0062]
In FIG. 3, the speed control curve indicated by the dotted line shows the traverse motion curve as described above in Patent Document 2, and in the control method using the crank rocking body driven by the rotation of the main shaft, its structural characteristics Therefore, the traverse motion curve as a whole is merely a Sin curve, and is a continuous motion of the mechanism driven by the main shaft. Therefore, when the hollow fiber membrane weft is arranged during knitting, the warp guide hanger swing motion is completely stopped. Can't produce.
[0063]
As a result, the arranged hollow fiber weft tension becomes a factor. Further, since the ratio of the traverse device in the entire knitting machine is increased by the continuous mechanical mechanism, the entire device becomes large, and the inertia at the time of driving the traverse guide is large, so that high speed knitting is difficult.
[0064]
Moreover, in the thing of patent document 2, the area which performs traverse movement at a constant speed cannot be provided so that a traverse guide may become the highest speed in the intermediate point of reciprocation. For this reason, the tension of the hollow fiber membrane supplied to the traverse guide varies during travel of the traverse guide and cannot be made constant.
[0065]
On the other hand, in the present invention, the traverse movement in one course for making the reciprocating movement of the traverse guide into a U-shaped movement as shown in FIG. 4 is the movement curve as shown by the solid line in FIG. Therefore, the tension of the hollow fiber membrane can be kept constant when performing constant speed traveling in the intermediate portion of the traverse, and stable supply can be performed.
Further, at the end of the traverse motion, the speed of the traverse guide can be made zero, and the knitting operation with the warp can be performed in a state where the hollow fiber membrane as the weft is stopped.
[0066]
Furthermore, since the travel time in the traverse section can be obtained by the area surrounded by the horizontal axis and the motion curve, as can be seen from FIG. 3, the travel time can be shortened compared to that of Patent Document 2, and as a result The knitting work time can be shortened.
[0067]
The spring-loaded guide bends in a U-shape and swings around the bent portion. The swinging rotation is controlled by a control device (not shown) in synchronization with the reciprocating motion of the traverse guide 32. The reciprocating motion of the traverse guide 32 can be taken out by using a link mechanism or the like, and the spring-equipped guide 21 can be swung and rotated by the motion of the link mechanism.
[0068]
When the traverse guide 32 gradually decelerates in the vicinity of each end of the traverse motion, the guide with the spring 22 is swung so that the guide member 22 and the guide member 23 are aligned in substantially the same vertical line. The tension of the hollow fiber membrane 3 to be supplied to can be reduced.
[0069]
When the traverse guide 32 gradually increases from each end of the traverse motion, the tension of the hollow fiber membrane 3 supplied to the traverse guide 32 by swinging the spring-loaded guide 21 in the state shown in FIG. And the tension of the hollow fiber membrane 3 at the folded portion of the knitted fabric can be ensured.
[0070]
The spring-equipped guide 21 is configured such that a long spring member is bent in a U-shape, and the length from the bent portion 25 to the guide member 22 is longer than the length from the bent portion 25 to the guide member 22.
When the guide member 22 and the guide member 23 are arranged in a substantially vertical state, the tension pulling the hollow fiber membrane 3 in the air dancer part B can be reduced, and the tension of the hollow fiber membrane 3 supplied to the traverse guide 32 can be reduced. It can be reduced quickly.
[0071]
Furthermore, when the guide portion 23 of the spring-loaded guide 21 is swung in a direction away from the traverse guide 32, the movement amount of the guide portion 23 becomes larger than the movement amount of the guide portion 22, and the supply of the hollow fiber membrane to the traverse guide Tension can be increased quickly.
[0072]
In the warp supply section D, the warp 41 pulled out from the warp bobbin 40 is transported by a warp transport roller (not shown), guided to the warp heald 33 via a spring-loaded guide 43, and synchronized with the reciprocating motion of the traverse guide 32. While the warp yarn 41 is hooked by the up and down knitting needles 56 to form a chain knitting, the hollow fiber membrane 3 which is a weft is restrained to form a knitted fabric. As the warp 41, a polyester processed yarn or the like can be used.
[0073]
The knitted hollow fiber knitted fabric 52 transports and accumulates the knitted hollow fiber knitted fabric 52 while being taken up by the take-up roller 53 and is accumulated in a storage box 55 as a knitted fabric accumulated portion. .
A rotary cutter that cuts the knitted fabric 52 in the longitudinal direction and a pressing roller having a facing portion formed in a concave portion may be provided on the cutter facing the cutter during the conveyance of the knitted fabric 52.
[0074]
By knitting a long knitted fabric by using a cutter, the knitted fabric can be divided into predetermined widths and cut in the longitudinal direction to produce a large number of knitted fabrics simultaneously. .
The take-up roller 2 can be driven and controlled using a drive motor that is driven and controlled by the control device 10.
[Brief description of the drawings]
FIG. 1 is a schematic diagram showing the overall configuration of the present invention.
FIG. 2 is a main part front view showing a moving state of a traverse guide in the knitting machine.
FIG. 3 is a diagram illustrating a motion curve of a traverse motion.
FIG. 4 is a diagram showing a tension adjustment state at a traverse end.
FIG. 5 is a schematic view of a hollow fiber membrane knitting device in a conventional example.
FIG. 6 is a schematic view showing a weft insertion mechanism of a Raschel machine in a conventional example.
[Explanation of symbols]
1 Weft bobbin
2 Turntable
3 Hollow fiber membrane
4 Rotary joint
5 Weft guide
6 Supply roller
7 Nip roller
8 Supply motor
9 Endless belt
10 Control device
11 Air blower
12, 13 Air duct
14, 15 nozzles
16 Introduction Guide
18-1 to 18-4 detection sensor
19 Air flow
21 Spring-loaded guide
22-24 Guide part
25 Bending part
30 Traverse motor
31 Warp hanger
32 Traverse Guide
33 Warp Held
34 Weft guide
35 Laura
36 Traverse Rail
37 Drive pulley
38 Driven pulley
39 Endless Belt
40 warp bobbins
41 Warp
42 Warp guide
43 Guide with spring
50 Knitting needle lifting arm
51 Needle guide plate
52 Knitted fabric
53 Take-up roll
54 Discharge roll
55 Storage box
56 Knitting needles
57 Brake means
60 Main drive shaft
61 Body drive motor
62 Encoder
71 bobbins
72 Hollow fiber membrane
73 Feed Roller
74 nozzles
75, 76 detection sensor
77 Vertex position
78 Air blower
79 Guide
80 traverse units
81 warp
82 Weft insertion guide
90 Traverse Guide
91 Weft
92 The basic axis of the Raschel machine
93 pulley
94-100 lever
101 Pulley group
102 Traverse guide drive unit
104 Timing belt
105, 106 Timing pulley
108 Traverse Guide
109 rail
110 Endless Belt
111 Crank mechanism
112 Stroke amplification mechanism
A Supply section
B Air dancer
C knitting machine
D Warp supply section
E Transport stacking unit

Claims (7)

In the hollow fiber membrane knitting device,
A weft bobbin wound with a hollow fiber membrane as a weft,
At least one supply roller for feeding the hollow fiber membrane drawn from the weft bobbin and a supply motor for driving and controlling the supply roller;
An air dancer unit having a pair of nozzles for discharging an air flow that blows upward the hollow fiber membrane that is being sent out by the supply roller;
Detecting means for detecting the apex position of the hollow fiber membrane which draws a substantially parabolic shape in the air dancer part;
A guide with a spring for guiding the hollow fiber membrane that has traveled down from the air dancer part at a portion below the air flow outlet of the nozzle;
A traverse guide of a knitting machine to which the hollow fiber membrane passed through the spring-loaded guide is supplied and a traverse motor for driving and controlling the reciprocating motion of the traverse guide;
A control device for controlling the hollow fiber membrane device,
The control device issues a synchronization signal and a drive control signal, which are synchronized with the drive of the main drive shaft in the knitting machine, to the supply motor and the traverse motor, respectively.
The drive control signal issued to the supply motor is a control signal for the drive speed input to the detection signal of the detection means and issued to the supply motor based on the detection signal.
The pair of nozzles is distributed and supplied with an air flow blown from an air blower,
The hollow fiber is characterized in that the hollow fiber membrane is made to travel upward by the air flow from one of the nozzles in the air dancer portion, and the hollow fiber membrane is made to travel downward against the air flow on the other nozzle side. Membrane knitting device. The guide with spring includes guide members at both ends of a long spring member bent in a U-shape, and the length from the bent portion to the upstream guide member is the guide from the bent portion to the downstream side. 2. The hollow fiber membrane knitting device according to claim 1, wherein the hollow fiber membrane knitting device is configured to be shorter than a length to a member, and wherein the guide with a spring swings around the bent portion in synchronization with a traverse motion of the traverse guide. . The detection means includes a plurality of detection sensors spaced apart in the vertical direction, and a detection signal of the apex position of the hollow fiber membrane detected by the detection sensor is input to the control device, and the control device according to the detection signal To the supply motor, the hollow fiber membrane supply speed of the supply roller is about 50 ± 10% of the average knitting speed in the knitting machine, about 115 ± 10% of the average knitting speed, and 3. The hollow fiber membrane knitting device according to claim 1, wherein the drive control signal for controlling the supply stop is issued. The hollow fiber membrane knitting device according to claim 3, wherein the supply motor is an inverter motor. The drive control signal for the traverse motor is a drive control signal for performing speed control by a cycloid curve at a start end portion and an end end portion of the traverse motion of the traverse guide and performing constant speed control at an intermediate portion of the traverse motion. The hollow fiber membrane knitting device according to claim 1 or 2, wherein the device is a hollow fiber membrane knitting device. 6. The hollow fiber membrane knitting device according to claim 5, wherein the traverse motor is a servo motor. At least one or more of the weft bobbins are rotatably arranged on a turntable, and the turntable rotates around a direction orthogonal to the rotation axis of the weft bobbins as a rotation axis, and a hollow fiber membrane drawn from each weft bobbin is used. The hollow fiber membrane knitting device according to claim 1 or 2, wherein a guide portion for guiding is arranged on an upstream side of the supply roller.

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