JP3051324B2 - Method of feeding yarn material to loom - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for feeding a thread material to a weaving machine, for example, supplying a thread material wound on a spool to a weft insertion gripper of a shuttleless loom.

[0002]

2. Description of the Related Art As a thread-like material for highly elastic film strips, for example, a non-reinforced yarn having a rectangular cross section is commercially available as Lurex.

[0003] The use of high modulus film strips as yarn in shuttle looms presents a substantial problem in practice. This is because the release point of the yarn drawn from the spool moves uncontrollably in the front-rear direction along the surface of the spool on the spool according to the characteristics of the yarn. Such movement of the detachment point from the desired position causes a decrease in the operation speed of the loom and the cutting of the yarn, resulting in a decrease in the quality of the woven fabric.

[0004] The use of non-reinforced yarns of rectangular cross section in shuttleless looms presents special problems. Yarns of this type are drawn from the winding in a so-called overhead manner, i.e. over a flange spool holding the winding or a flange of the disk spool, in which case the disk spool is stationary and the yarn wound on the disk spool Is drawn over the flange, so that the drawn yarn is twisted. The twist of the yarn increases as the winding amount of the disk spool decreases. The occurrence of such twisting in the tensioned state is undesirable because undesired loops are formed in the yarn when the tensioning action is removed. When the yarn is pulled from the wound yarn, twist is accumulated on the yarn to such an extent that a loop is formed even if the yarn is pulled.
These loops are caught at the first brake downstream of the disc spool, adding a stronger pull to the yarn. As a result of such an increase in the pulling force, the yarn is permanently drawn, reducing the cross section of the yarn or breaking the yarn. The reduction in the cross section of the yarn reduces the quality of the woven fabric, and the cutting of the yarn involves a stoppage of the loom and a defect in the woven fabric to rejoin the yarn. Such woven fabric defects are particularly pronounced in woven fabrics that contain a high percentage of weft yarns of thread-like material (lurex). When the entire width is a thread-like material (lurex),
Such weaving defects are even more pronounced. As a result, a large amount of inferior products is generated in a woven fabric using a weft thread material (lurex). This problem can be solved by reducing the number of stops of the loom.

Another problem in using thread-like material (lurex) as the weft of woven fabrics is caused by the high elasticity of such threads. Any delay in the yarn as it is pulled over the flange of the disk spool will cause the yarn to stretch and cause a change in the form of so-called thin spots or discoloration in the finished woven fabric. Will be noticeable. Such woven fabric defects occur when the yarn is pulled out of the wound yarn in direct contact with the flange of the spool, or when the yarn loop is temporarily caught by the yarn brake.

[0006] The above-mentioned problems become more remarkable as the amount of the wound yarn of the spool decreases in the weaving process.
In other words, the smaller the diameter of the spool yarn, the more yarn layers must be drawn out per unit time, so the spool rotation speed (rpm)
Increase. Therefore, as the amount of yarn on the spool decreases, the cutting of the yarn increases. These appear directly on the woven fabric and reduce the quality of the product, making the woven fabric a second class product.

The appearance of a woven fabric using a thread material (lurex) is greatly affected by a so-called rotation point generated by drawing the thread material (lurex) from a spool into an overhead. In order to solve all of the above problems, it is highly desirable to draw the thread material (lurex) from the spool without substantially twisting.

The above-mentioned problem is not solved by a method in which the weft is drawn out from the rotatable yarn supply spool in the axial direction of the yarn supply spool, instead of being pulled out from the stationary spool, and the yarn supply spool is rotated. This is for high speed looms,
Since the acceleration and deceleration of the yarn supply spool cannot be controlled only by the speed of pulling out the weft yarn from the rotatable yarn supply spool, the rotation speed of the yarn supply spool is synchronized with the rotation speed of the intermediate weft storage device in the high-speed loom. Because it is practically impossible.

Even in the case where the yarn drawing-out direction or the yarn feeding-out direction of the yarn supplying spool is in the direction perpendicular to the rotation axis of the yarn supplying spool, the above problem is caused by the problem of synchronizing the rotational speed of the yarn supplying spool with the drawing speed. The point could not be resolved.
Therefore, no fine adjustment was made for the desired compensation of the thread withdrawal speed.

[0010]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a weaving machine with a yarn-like material which prevents twisting of a weft yarn when the weft yarn is drawn from an yarn supply spool in an overhead type in consideration of the above points. It is to provide a way to do it.

The method of feeding a yarn material to a loom according to the present invention comprises the steps of: drawing out a yarn substantially parallel to the rotation axis of the yarn supply spool; The position is at least substantially stationary relative to the circumferential direction, but actively controls the yarn supply spool to move in a direction parallel to the axis of rotation of the yarn supply spool, and excessive pulling, catching, breaking, Preventing the aforementioned problems including loop formation and twisting, drawing the weft yarn from the yarn supply spool, feeding the weft yarn to the weft insertion gripper of the loom without stretching or twisting, and preventing breakage of the weft yarn. .

[0012]

According to the present invention, a method of feeding a thread material to a loom is provided in which a thread material wound on a spool is pulled out from a release point around the spool, and another rewinding rotational movement is applied to the spool. In a method of forcibly applying a yarn material to a loom, a high elasticity film strip is used as the yarn material, the spool is rotationally driven by a separate motor, and another rewinding rotational movement is performed when the release point is set at the spool. So as to be substantially fixed with respect to the center of rotation or to limit at least the movement of the release point to an acceptable minimum.
The consumption rate of the high elasticity film strip is substantially synchronized with the consumption rate of the high elasticity film strip, and the consumption rate of the high elasticity film strip is controlled by means provided on the loom. Another rotational movement of the stored high modulus film strip, which is temporarily stored by being wound on an adjacent coil of the weft storage device, is based on the unwind speed of the high elastic film strip wound on the coil of the weft storage device. It is characterized by being guided.

According to the method of feeding a thread material to a loom according to the present invention, the yarn pulled out from the spool at a predetermined speed forms a separating point between the winding yarn and the yarn separating from the winding yarn. The weft is supplied to the weft insertion means. The yarn supply spool is rotated so that the winding is rotated in synchronization with the drawing speed or the feeding speed so that the release point moves substantially in the axial direction and is substantially fixed or completely fixed with respect to the rotation center of the winding. Rotate positively.

According to the method of feeding a thread material to a loom of the present invention, twisting does not occur in the thread even when the thread is pulled out of the spool in an overhead manner. This is the same rotation speed (rp) as when the yarn is unwound when the spool is stationary.
This is achieved by positively driving the spool at m). Ideally, the yarn must be pulled out of the spool so that it is stationary in the outer peripheral direction of the spool with the rotational speed (rpm) of the yarn being zero, but is movable in the axial direction. In other words, the yarn is pulled out such that the release point does not move in the circumferential direction of the spool. When pulling out the yarn in an overhead manner,
The release point is located, for example, vertically above the rotation axis of the spool. The spool is driven in a direction opposite to the feeding direction.
According to the present invention, for example, assuming that the pull-out direction, ie, the feed-out direction is clockwise, the spool is rotated counterclockwise at such a speed that the release point remains at least substantially stationary in the circumferential direction.

Synchronization of the yarn withdrawal rotation speed (rpm) and the reverse rotation speed (rpm) of the spool can be performed in several ways. In one embodiment, the spool and the winding of the spool are detected in a contactless manner, and a detection signal is sent to a microprocessor, which sends a control signal to a drive control to determine the rotational speed of the spool. Adjust to speed. In other words, as the number of windings on the spool decreases and the drawing speed increases, the rotation speed of the spool is correspondingly increased.
This prevents unwanted twisting of the yarn.

According to the present invention, the yarn brake is disposed downstream of the spool when viewed in the yarn pull-out direction in order to prevent the yarn from being drawn. The thread brake is driven in synchronization with an intermediate thread storage device arranged downstream of the thread brake. The direction of rotation of the thread brake is opposite to the direction in which the thread is twisted.

According to the present invention, when a relatively large weight or a somewhat unbalanced spool is used, a high rotation speed (rpm) cannot be obtained for the spool. Rotational speed (rp
The rotational speed (rpm) of the spool is varied so as to decrease in accordance with m).

According to the invention, a second yarn brake is arranged at the outlet of the intermediate yarn storage device. The second yarn brake is also driven to rotate in the direction opposite to the yarn twisting direction. Thus, to compensate for the twist applied to the yarn of the intermediate yarn storage device, the second yarn brake rotates in a direction opposite to the direction of rotation of the rotating portion of the intermediate yarn storage device.

It has been discovered that overdrawing of the yarn can be reliably prevented by increasing the diameter of the flange on the yarn withdrawal side of the spool. This construction prevents the yarn from being pulled out of the spool at an acute angle. An acute angle of about 2 ° to 5 ° between the yarn withdrawal direction and the axis of rotation of the spool must be avoided. By increasing the diameter of the spool on the yarn drawer side, this angle is increased to about 40-60 °, which improves the separation of the yarn from the winding and applies an undesired tensile stress on the yarn. Nothing. Another advantage of increasing the flange diameter on the drawer side of the spool is that the yarn is subjected to centrifugal force, which causes the yarn to be pulled radially outward from the winding and facilitates removal of the yarn from the winding. It is. As a result, the drawn yarn is easily pulled out of the wound yarn without being caught on the yarn of the wound yarn, and the above-mentioned undesirable overdrawing and yarn breakage can be prevented.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 1 denotes a disk spool, on which a spool core 36 in which a thread 2 is wound in a coil shape 4 is mounted. The spool core 36 has a flange or disk 3. The disk spool 1 is driven by a motor 9 mounted on a mounting portion 8 fixed on a base 7. Mounting part 8
Is adjustable in position with respect to the stand 7. Therefore, the motor 9 is adjustable in the vertical direction of the arrow 21 and is adjustable in the horizontal direction of the arrow 20.

The control unit 33 of the motor 9 is connected to the central processing unit 10 via the conductor 15. Central processing unit 1
0 is connected to the sensor 31 via the conducting wire 14.
The sensor 31 includes a sensor head 32, for example, an optical sensor head for scanning the spool 1. The sensor head 32 sends to the central processing unit 10 a signal indicating an instantaneous state of the yarn removing or yarn extracting operation.

The yarn 2 wound around the spool core 36
Is pulled out of the disk spool 1 in the direction shown by the arrow 2 '(dotted line) as shown in FIG. The initial winding direction of the thread 2 on the disk spool 1 is indicated by an arrow 6 in FIG. In FIG. 3, reference numeral 44 indicates a separation point at which the yarn 2 separates from the winding unit 4. Disk spool 1
Is stationary, and when the yarn 2 is pulled out of the disk spool 1, the release point 44 runs around the winding section 4 in a direction opposite to the initial winding direction 6 indicated by an arrow 5 in FIG. However, according to the present invention, the disk spool 1 is actively driven according to a control signal described in detail below. The rotation direction of the disk spool 1 is the initial winding direction 6. Therefore, the movement of the detachment point 44 is compensated to such an extent that it is approximately or completely stationary with respect to the rotation center of the disk spool 1. This feature of the invention ensures that the twist of the yarn 2 is prevented by compensating the movement of the release point 44 by a corresponding reverse rotation of the disc spool 1. The axial movement 35 of the disc spool 1 is not affected by this.

According to the present invention, the disk 37 of the disk spool 1 has a larger diameter than the disk 3 of the spool core 36, as shown in FIG. The disk 37 of the disk spool 1 prevents the thread 2 from being drawn out at an acute angle α, as described in detail below. Disk 37
Can be configured to rotate together with the disk spool 1 or to be stationary even when the disk spool 1 rotates.

When a large-diameter disk is not used as the disk 37 of the disk spool 1, the angle α at which the yarn 2 is pulled out from the disk spool 1 becomes an undesirable acute angle as shown in FIG. The coil portion of the winding portion 4 will be caught at the separation point 44. The large-diameter disk 37 has a pull-out angle α of 3
Expanding to an angle between about 40 and 60 degrees as shown at 8;
The catching of the yarn and the breaking of the yarn are substantially prevented. The pull-out angle α is an angle between the pull-out direction of the yarn and the horizontal axis 34 or a line parallel to the horizontal axis 34.

Another advantage of the large-diameter disk 37 is that, since the centrifugal force on the yarn 2 is increased, a pulling force is applied to the yarn in a direction that facilitates its detachment, thereby preventing the yarn from being caught. This feature is particularly true when the release point 44 is
6 is advantageous when it is close to the inner surface of the disk 3.

The yarn 2 is fed along the horizontal axis 34 toward the yarn guide 19 of the yarn brake 16 downstream of the disk 3. The yarn brake 16 transfers the yarn 2 to the intermediate yarn storage device 2.
Introduce to 2. The intermediate yarn storage device 22 has a cylindrical spool 24 for temporarily or excessively storing some amount of yarn.

According to the invention, the thread brake 16 is only required if the intermediate thread storage device 22 is used.
If the intermediate yarn storage device 22 is not used, the yarn brake 2
Only 8 is used. The yarn 2 is fed downstream of the yarn brake 28 in the direction of arrow 29, for example, towards the weft insertion gripper of a shuttleless loom.

In the embodiment shown in FIGS. 1 and 2, both the brakes 16 and 28 are used,
The yarn brake 16 applies an appropriate pulling force to the yarn 2 upstream of the intermediate yarn storage device 22, and the yarn brake 28 applies a pulling force suitable for inserting the weft yarn into the yarn 2 downstream of the intermediate yarn storage device 22.

The intermediate yarn storage device 22 has a normal structure, and has a housing 22a provided with a motor for driving the rotor 23 in the direction of arrow 39. Rotor 2
3 supports a cylindrical spool 24 for temporarily storing some amount of yarn. A small amount of yarn is supplied to the cylindrical spool 2
4 is pulled out by the drawer 26. The thread drawn from the cylindrical spool 24 is guided to a thread brake 28 through a guide thread 27. Intermediate yarn storage device 22
The motor control unit 11 is connected to the central processing unit 10 via a conducting wire 12. The housing 22a is attached to a support 25 fixed on the base 7 so as to be adjustable. The support 25 can be adjusted in the vertical direction of the arrow 21a and in the horizontal direction of the arrow 20a. Thread brake 16
May include a braking piece 17 controlled by a centrifugal governor 18.

FIG. 3 shows another embodiment of a yarn supplying spool 40 similar to the disk spool 1 of FIG. The yarn supply spool 40 is moved around an axis 41 by an arrow 4 by a motor 42.
It is rotated in the direction of 2a. The rotation direction 42a of the yarn supply spool 40 corresponds to the initial winding direction, and is opposite to the unwinding direction 47a of the yarn 47 that separates from the winding portion of the yarn supply spool 40 at the separation point 44. The motor 42 is controlled by a motor control unit 43. The motor control unit 43 includes a conductor 43
a is connected to the control signal generator 45.

The control signal generator 45 is responsive to a sensor or scanner 46 for detecting the speed of the yarn supply spool 40, for example, optically, electrically or electronically. Scanner cooperates with sensor arm. The sensor arm 48 is supported by a journal shaft (not shown) and is biased by a spring. The sensor arm 48 is the scanner 4
6 having a cooperating tip. The inclination angle of the sensor arm 48 depends on the yarn amount of the yarn supply spool 40. The yarn supply spool 40 must rotate so rapidly to keep the release point 44 stationary as yarn is removed from the yarn supply spool 40. In addition, when the diameter of the winding portion of the yarn supply spool 40 becomes small, the yarn detaching speed must be increased in order to keep the yarn pulling speed constant. Accordingly, the motor 42 remains on the yarn supply spool 40 in response to a control signal from the control signal generator 45 to compensate to keep the release point 44 substantially stationary with respect to the rotational movement. The yarn supply spool 40 is rotated according to the yarn amount. The detachment point 44 moves in the front-back direction along a line parallel to the rotation axis 41 of the yarn supply spool 40.

Instead of the sensor arm 48 for detecting the remaining diameter of the wound yarn of the yarn supply spool 40, a sensor arm 49 pivotally supported outside the yarn supply spool 40 is used as shown by a broken line in FIG. Can be. Its function is the same as that of the sensor arm 48. In any case, the motor control unit 43 compares the reference signal from the central processing unit 10 with the control signal from the control signal generator 45. When both signals match, the rotational speed of the yarn supply spool 40 remains constant. When the two signals do not match, the speed of the yarn supply spool 40 increases or decreases according to the amount of mismatch.

In the embodiment shown in FIG. 4, the scanner 50 has a scanning surface area 51 facing a part of the outer peripheral surface of the yarn supply spool 40. The scanner 50 detects the instantaneous diameter of the winding yarn remaining on the yarn supply spool 40, and
Monitor position 4. Without the compensation function according to the present invention, the release point 44 moves up or down or along the outer circumference of the stationary yarn supply spool. However, the movement of the detachment point 44 is detected by the scanning surface 51 of the scanner 50, and the detection signal of the scanner 50 is sent to the motor control unit 43 through the conducting wire 52, and the motor control unit 43 transmits the detection signal from the central processing unit 10. , A control signal is issued to the motor 42 that rotates the yarn supply spool 40 in the direction of the arrow. Due to this speed compensation, the yarn separation point 44 of the yarn supply spool 40 becomes approximately stationary or completely stationary.

The present invention is not limited to the above description, but can be arbitrarily modified within the scope of the invention.

[0035]

As described above, according to the present invention, the yarn is pulled out substantially parallel to the axis of the yarn supply spool.
Positively controlling the spool such that the position of the release point where the yarn separates from the winding of the spool is at least substantially stationary in the circumferential direction or movable in a direction parallel to the rotation axis of the spool; The weft thread drawn from the spool is fed to the weft thread insertion gripper of the loom without stretching or twisting, so that the winding threads are not caught on each other and the thread is not broken.

[Brief description of the drawings]

FIG. 1 is a schematic side view of a yarn feeding device used in a method of feeding a yarn material to a loom according to the present invention.

FIG. 2 is a partial side view showing a state in which a yarn is drawn from a yarn supply unit wound in a coil shape.

FIG. 3 is a schematic perspective view showing a structure in which a rotationally driven yarn supply spool is scanned by a sensor fixed to a scanning lever or a detection lever.

FIG. 4 is a diagram showing control of a scanner and a spool drive motor facing a yarn supply spool for non-contact scanning.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Disc spool 3 Flange 4 Winding part 6 Spool rotation direction 9 Motor 10 Central processing unit 16 Thread brake 22 Intermediate thread storage device 40 Thread feed spool 43 Motor control unit 44 Release point

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-59-186872 (JP, A) JP-A-62-276053 (JP, A) JP-A-1-235563 (JP, A) JP-A-2-2 231371 (JP, A) JP-B-45-2340 (JP, B1) JP-B-47-9865 (JP, B1) US Patent 4,463,911 (US, A) US Patent 4,519,197 (US, A) (58) (Int.Cl. ⁷ , DB name) D03D 47/34-47/38 B65H 49/18-49/34 B65H 51/20-51/24

Claims (7)

(57) [Claims] 1. A method of feeding a thread material to a loom, comprising drawing a thread material wound on a spool from a release point around the spool and forcibly applying another rewinding rotational movement to the spool. High elastic film strip is used as
The spool is rotationally driven by a separate electric motor, and another rewinding rotational movement is such that the release point is substantially fixed with respect to the center of rotation of the spool, or at least the movement of the release point is limited to an acceptable minimum. The consumption rate of the high elasticity film strip is substantially synchronized with the consumption rate of the high elasticity film strip, and the consumption rate of the high elasticity film strip is controlled by means provided on the loom. Temporarily stored by being wound on an adjacent coil of the weft storage device,
A method of feeding yarn-like material to a loom, characterized in that the different rotational movement of the stored high elasticity film strip is derived from the unwind speed of the high elasticity film strip wound on the coil of the weft storage device. 2. The loom according to claim 1, wherein the electric motor is controlled by a motor control unit connected to a control signal generator responsive to a sensor for detecting the speed of the spool. How to feed yarn. 3. The detection of the speed of the spool is performed by a sensor contacting the surface of the spool.
A method for feeding the thread-like material according to 1 above to a loom. 4. The loom according to claim 1, wherein the electric motor is controlled by a motor control unit connected to a central processing unit responsive to a sensor for detecting a speed of the spool. How to thread. 5. The method according to claim 4, wherein the speed of the spool is detected in a non-contact manner by a sensor facing the spool. 6. A sensor cooperating with the spool and disposed downstream of the spool for contactlessly ascertaining the twist of the filamentous material by optical means, the sensor sends a control signal to a central processing unit and controls the spool. 2. The method according to claim 1, wherein the electric motor is driven such that the detachment point is maintained at a position substantially fixed in the circumferential direction. 7. The method according to claim 1, wherein the thread material is withdrawn from the spool at a withdrawal angle between 40 and 60 degrees.