JPH0826503B2 - Method of preventing loom generation in a loom - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for preventing the occurrence of a weft bar due to a change in warp tension when a design is changed.

[Prior Art] Maintaining an appropriate tension of a warp sent out from a warp beam is achieved by controlling a warp sending-out speed, and generation of a weft bar in weaving without changing a fabric structure can be relatively easily prevented. A weaving bar is a part where the weaving density fluctuates greatly. A means for changing this weaving density during weaving is Japanese Patent Publication No. 44-28270.
It is disclosed in JP-B No. 53-4142 and JP-A No. 60-181349.

In JP-B-44-28270, the relative speed of the winding motor with respect to the motor driving the mechanism for inserting and driving the weft in synchronism with the warp movement changes one of the resistances of the pair of variable resistors. It can be changed by things. Weaving density can be changed by changing the relative speed between the two electric motors.

In Japanese Examined Patent Publication No. 53-4142, a counter timer emits a pulse signal in response to a signal from a limit switch mechanically interlocking with a pattern changing device (dobby) of a rapier loom,
The take-up motor is rotated by an amount proportional to the number of pulse signals. Thereby, the winding speed can be changed according to the weft diameter.

In Japanese Laid-Open Patent Publication No. 60-181349, the arithmetic and control unit calculates and sets the rotation speed of the take-up motor based on the weaving conditions such as the loom rotational speed and the weft insertion density that are set as input, and the machine base from the encoder during weaving. The set speed data is read based on the rotation speed signal. By this reading, the rotation speed of the winding motor is controlled, and the set weave density control is performed.

[Problems to be Solved by the Invention] However, for example, in the case of a plain weave design, all warps open and close each time weft insertion, whereas in the case of a satin weave design, continuous opening is maintained. The tension state is significantly different between the plain weave design and the satin weave design, and the tension sharply increases when the plain weave design is changed to the satin weave design, and conversely the tension is sharply decreased when the satin weave design is changed to the plain weave design. Further, when the forming angles of the upper and lower warps with respect to the warp line are different from each other in the upper and lower directions, the tension fluctuation at the time of changing the structure is further increased. The weaving bar generated by such a large tension fluctuation different from the normal warp tension fluctuation at the time of changing the design during weaving cannot be eliminated by the weaving density control of the conventional means. Therefore, for example, a thick step occurs due to a rapid increase in tension when changing from a plain weave design to a satin weave design, and a thin step occurs due to a rapid decrease in tension when changing from a satin weave design to a plain weave design.

Nothing is mentioned in any of the above-mentioned conventional publications regarding the prevention of the occurrence of the wefts when the structure is changed.

It is an object of the present invention to provide a method for preventing the occurrence of a weft due to a change in warp tension when changing the design.

[Means for Solving the Problem] Therefore, in the first invention, the action of changing the cloth fell position caused by the change in the warp tension at the time of changing the structure during weaving is temporarily performed by the winding motor independent of the loom drive motor. In the second invention, in addition to the first invention, the warp tension control is invalidated either before or after the change of the structure. Further, in the third invention, the warp length is changed either before or after the design change.

[Operation] At the time of changing the structure, the rotational speed of the winding motor is temporarily changed and controlled in accordance with the changing direction of the warp tension caused by the change in the structure. This temporary change in the rotational speed causes the cloth fell to be corrected in the direction opposite to the changing direction of the cloth fell position due to the warp tension fluctuation. As a result, the cloth fell position is held at an appropriate position, and the occurrence of the weft bar at the time of changing the structure is prevented.

In addition to such cloth fell position correction, if the tension control is invalidated either before or after the change of the structure, the excessive over-correction of the cloth fell position due to the tension control in response to the warp tension fluctuation is eliminated. It is possible to prevent good weaving bar generation.
Further, the same effect can be obtained by changing the warp length instead of temporarily changing the rotation speed of the winding motor.

[Embodiment] Hereinafter, an embodiment embodying the first invention in the case of a texture pattern including a plain weave design and a satin weave design
A description will be given based on FIG.

FIG. 1 schematically shows the side surface of the entire loom, M is a loom drive motor, and the loom drive motor M is controlled by the loom control computer C ₀ . Reference numeral 1 is a feed motor that is independent of the loom drive motor M and is capable of forward and reverse rotation. The warp T fed from the warp beam 2 driven by the feeding motor 1 is guided to the side of the weaving device 7 including the heddle 5, the reed 6, and the weft inserting device (not shown) via the back roller 3 and the tension roller 4. After being formed from the cloth fell W ₁ to the woven cloth W, it is wound around the winding shaft 12 via the expansion bar 8, the surface roller 9, the press roller 10 and the wrinkle removing guide member 11. The tension roller 4 is attached to one end of the tension lever 13, and a predetermined tension is applied to the warp T by a tension spring 14 attached to the other end of the tension lever 13. The tension lever 13 is rotatably supported at one end of a detection lever 15, and the load cell 16 is connected to the other end of the detection lever 15. Therefore, the warp tension is transmitted to the load cell 16 via the tension roller 4, the tension lever 13 and the detection lever 15, and the load cell 16 sends out an electric signal according to the warp tension and outputs it to the control computer C ₁ .

The delivery control computer C ₁ compares the tension preset by the input setting device 17 with the detected tension grasped by the input signal, the initial warp beam diameter preset by the input setting device 17, and the fabric texture pattern. The rotation speed of the feed motor 1 is controlled based on the warp beam diameter calculated from the input data such as the above and the detection signal from the rotary encoder 18 for detecting the machine rotation angle. As a result, the warp tension during normal operation is controlled, and weaving bar generation is prevented. Further, the feed-out control computer C ₁ feedback-controls the rotation speed of the feed-out motor 1 based on the rotation-speed detection signal from the rotary encoder 1a incorporated in the feed-out motor 1.

The surface roller 9 is operatively connected to a winding motor 19 which is independent of the loom drive motor M and is capable of forward and reverse rotation.
Rotation of the take-up motor 19 is a winding control computer C ₂ of operation control receiving, winding control computer C ₂ is wound up on the basis of the rotational speed detection signal from the rotary encoder 19a incorporated in the winding motor 19 motor 19 Feedback control the speed.

The opening is formed by the vertical movement of the heddle 5 by the dobby opening device including the drive unit 20 and the opening control computer C ₃ . The fabric weave pattern is input and set in the opening control computer C ₃ and the control computers C ₁ and C ₂ described above.
Is preset and set, the opening control computer C ₃ controls the opening formation based on the set tissue pattern, and the control computers C ₁ and C _{2 also} control the rotation speed of the motors 1 and 19 based on the set tissue pattern. That is, weaving density control is performed. To each of these control computers C ₁ , C ₂ and C ₃ , the reference signal and the forward / reverse identification signal output from the loom control computer C ₀ every one revolution of the machine are input, and by this information transfer, each control computer C ₁ The reading performance of each set tissue pattern in C, C ₂ , and C ₃ is synchronized.

Further, the winding control computer C ₂ executes a weaving bar generation prevention program shown in the flow chart of FIG.

The curve D _{3 in} FIG. 2 shows the set weave density curve, which also represents the set texture pattern. That is, the low density portion of the curve D ₃ represents the weft density of the plain weave design (hereinafter referred to as the plain design), and the high density part represents the weft density of the satin weave design (hereinafter referred to as the satin design). As shown by the straight line D ₀ in FIG. 2, the loom drive motor M operates at a predetermined rotation speed. Further, the curve D _{1 in} the figure represents the winding speed curve set for the winding motor 19, and the high speed V ₁ is set for the plain weaving and the low speed V ₂ is set for the satin weaving. . The curve D ₂ represents the delivery speed curve set for the delivery motor 1, and in the plain weaving, the high speed V ₃ ,
In the satin weaving, a low speed V ₄ is set.

When the weaving density changes from a low density to a high density as shown by the weaving density curve D ₃ , that is, when the weaving density changes from a flat weave to a satin weave, the delivery control computer C ₁ responds to the arrival of this weave change by the delivery motor 1. Sending speed is high speed V ₃
To change to low speed V ₄ from. On the other hand, the winding control computer C ₂ sets the winding speed of the winding motor 19 to high speed.
It instructs temporary over-accelerated to a higher velocity V ₁ x from V _1, the take-up motor 19 for a predetermined period of time rotates at a greater winding speed V ₁ x than the speed V _1. Then, after this temporary overacceleration, the winding control computer C ₂ commands the winding speed of the low speed V ₂ , and the winding motor 19 operates at the speed V ₂ for the satin tissue.

Rights tissue from the time change to the satin tissue continuous opening further maintained when weaving satin pulls the front W ₁ weave over warp tension due to the tension imbalance vertical warp backward, in this state the chain line in FIG. 2 As shown by the curve D ₃ x, the weave density becomes higher than that of the satin weave. However, the rearward displacement action of the cloth fell W ₁ can be canceled by appropriately performing the temporary overacceleration of the winding motor 19, and by this canceling action, the cloth fell W ₁
Can be held in a proper position. As a result, the occurrence of thick steps indicated by the chain line curve D ₃ x in FIG. 2 is eliminated.

When the satin design changes to the flat design as shown by the weave density curve D ₃ , the sending control computer C ₁ changes the sending speed from the low speed V ₄ to the high speed V to the sending motor 1 according to the arrival of the change of the structure. Command a change to ₃ . on the other hand,
The winding control computer C ₂ commands a temporary overdeceleration of the feeding speed of the winding motor 19 from the low speed V ₂ to a lower speed V ₂ y, and the winding motor 19 takes up a winding speed smaller than the speed V _1. Rotate at speed V ₂ y for a predetermined period. Then, after this temporary overdeceleration, the winding control computer C ₂ commands the winding speed of the high speed V ₁ , and the winding motor 19 operates at the speed V ₁ for the flat tissue.

When changing from satin design to flat design, continuous opening during satin weaving is maintained and the warp tension is temporarily reduced from the set tension due to the elimination of tension imbalance between the upper and lower warps, causing the cloth fell W ₁ to move forward. And If this is left as it is, the weave density becomes smaller than that of the plain weave, as shown by the chain line curve D ₃ y in FIG. However, the forward displacement action of the cloth fell W ₁ can be canceled by appropriately performing temporary over-deceleration of the winding motor 19, and this canceling action keeps the cloth fell W ₁ in an appropriate position. You can As a result, the occurrence of thin steps shown by the chain line curve D ₃ y in FIG. 2 is eliminated.

FIGS. 4 and 5 show an embodiment of the second invention for adjusting the acceleration and deceleration of the warp delivery speed and an embodiment of the third invention in which the function for invalidating the warp tension control is added to the embodiment of the first invention. An example is shown.

As shown in the flow chart of FIG. 5, in the embodiment of the second invention, when the time for changing the structure comes, the winding control computer C ₂ performs the rotation speed control for the cloth fell position correction similar to the embodiment, The feeding control computer C ₁ also controls the rotation speed for correcting the cloth fell position. This rotation speed control is represented by the curve D ₄ in FIG. ₄ , and the overacceleration in the change from the plain tissue to the satin tissue is performed at the speed V ₃ x, and the overdeceleration in the change from the satin tissue to the flat tissue is the speed. Done with V ₄ y.
Such rotation speed control on the sending side alleviates further warp tension fluctuations due to the rotation speed control on the winding side,
The stability of tension control is improved.

In the third embodiment of the invention, the winding control computer C ₂
The rotation speed control for correcting the cloth fell position is performed, and the feed-out control computer C ₁ switches the tension control between valid and invalid. That is, in this example, it is assumed that the satin weaving period is relatively short, the tension detection is invalidated in the case of the change from the flat tissue to the satin tissue, and the change from the satin tissue to the flat tissue is performed. In this case, tension detection is activated. As a result, excessive correction of the cloth fell position due to continuous tension control before and after the change of the structure is suppressed, and it is possible to further prevent the occurrence of the weft bar.

This point will be specifically described with reference to FIG. When the tissue changes from the flat tissue to the satin tissue, the warp tension increases momentarily as shown by the chain line D ₇ , and then decreases to the set tension T _p . The delivery speed at this time is higher than the set speed V ₄ for tension control, as indicated by the chain line D ₅ . For this reason, the weaving density becomes smaller than the set value D ₃ as indicated by the chain line D ₆ due to the increase in the sending speed, and thin steps are generated. In the present embodiment, when the flat tissue is changed to the satin tissue, during the period of the satin tissue, the detection of the warp tension by the detection lever 15 and the load cell 16 is invalidated, and the warp delivery control is stopped, whereby the delivery speed is There stabilized at around V ₄ as curve D _4, the warp tension is stabilized it remains elevated as indicated by a curve D _10. As a result, the weaving density is also maintained in the set state as indicated by the curve D ₃ , and the occurrence of the weft bar can be prevented.

On the other hand, when the satin structure changes to a flat structure, the warp tension is temporarily lower than the set tension T _p as shown by the chain line D ₉ in contrast to the above, so the warp delivery speed is also set as shown by the chain line D _8. As a result of the speed being lower than V ₃ , the weaving density becomes large as indicated by the chain line D ₈ and thick steps are generated. Against such a phenomenon, in the present embodiment, as described above, the detection of the warp tension is invalidated during the period of the satin tissue and the warp delivery control is stopped, so that the satin tissue is changed to the flat structure. At this time, the warp tension becomes close to the set tension T _p as shown by the curve D ₁₁ , the warp feed-out speed also remains at V ₃ , and the weaving density is maintained at the state of the curve D ₃ so that the occurrence of a weft bar can be prevented. it can.

Note that the tension control may be invalidated only for a predetermined period after the tissue change.

As another embodiment of the second invention, as shown in FIG. 6, the back roller 3 (which can be the tension roller 4) is operated by the cylinder 21 to change the warp length,
As shown in the figure, insert the roller 22 that contacts the warp sheet into the cylinder 21
The warp length may be changed depending on the operation.

[Advantages of the Invention] As described in detail above, the first aspect of the present invention provides a temporary action of a take-up motor, which is independent of the loom drive motor, for the action of changing the cloth fell position caused by the change in the warp tension when changing the texture during weaving. Since it is canceled by changing the rotation speed, the fluctuation of the cloth fell position due to the abrupt tension change at the time of changing the structure is suppressed by the temporary rotation speed control of the take-up motor. It has an excellent effect that it can be prevented.

In addition, in the second invention, in addition to the first invention, the warp tension control is invalidated either before or after the change of the texture, so that the tension control responding to the warp tension fluctuation at the time of the texture change is performed. This has an excellent effect that the excessive correction of the cloth fell position is eliminated and a better prevention of the weft bar is achieved.

[Brief description of drawings]

1 to 3 show an embodiment embodying the first invention,
FIG. 1 is a schematic side view, FIG. 2 is a graph showing rotational speed control, FIG. 3 is a flow chart for cloth fell position correction, and FIGS. 4 and 5 show an embodiment of the second invention. FIG. 5 is a graph showing rotation speed control, FIG. 5 is a flow chart of cloth fell position correction, and FIGS. 6 and 7 are schematic side views showing an embodiment of the third invention. The feeding motor 1, the winding motor 19, the feeding control computer C ₁ , the winding control computer C ₂ , and the velocities V ₁ x and V ₂ y that represent a temporary change in the rotation speed.

Front page continued (72) Inventor Soichi Tsuda 2-chome Toyota-cho, Kariya city, Aichi Prefecture Toyota Industries Corporation (56) References JP-A-2-182945 (JP, A) JP-A-1- 250439 (JP, A) JP-A 1-229843 (JP, A) JP-A 60-155757 (JP, A) Actually opened 61-16382 (JP, U)

Claims (3)

[Claims] 1. A weaving machine for a loom in which the action of changing the position of the cloth fell caused by the variation of the warp tension at the time of changing the structure during weaving is canceled by temporarily changing the rotation speed of the winding motor independent of the loom drive motor. Step prevention method. 2. The weaving position changing action caused by the change in warp tension when changing the structure during weaving is canceled by a temporary change in the rotation speed of the winding motor independent of the loom drive motor, and the structure A method for preventing generation of a weft bar in a loom, wherein the warp tension control is disabled either before or after the change. 3. The weaving position changing action caused by the change in warp tension at the time of changing the structure during weaving is canceled by temporarily changing the rotation speed of the winding motor independent of the loom drive motor, and the structure is also improved. A method for preventing occurrence of a weft bar in a loom, wherein the warp length is changed either before or after the change.