JPH07331559A - Weft-insertion method for rapier loom - Google Patents

Abstract

PURPOSE:To prevent weft-insertion miss by changing the position of retraction dead point of both rapier heads for delivery and reception according to the kind of weft. CONSTITUTION:A delivery rapier head 1 and a receiving rapier head 2 introduced into and retracted from a warp opening are driven by a single servo-motor or servo-motors 7, 8 connected to respective rapier heads 1, 2 to effect the delivery and insertion of a weft. A position pattern preset for each kind of weft is inputted through an inputting device 24 into a control computer C, which controls the servo-motors 7, 8 by feed-back control through amplifiers 21, 22 based on the rotary angle detection information of a loom transmitted from a rotary encoder 25 and rotary angle detection information on the servo- motors 7, 8 transmitted from rotary encoders 7a, 8a. The positions of the retraction dead points of both rapier heads 1, 2 are selected according to the kind of the weft to enable smooth catch and release of a weft.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a weft inserting method in a rapier loom in which a rapier head is inserted into a warp shed to insert a weft.

[0002]

2. Description of the Related Art As a reciprocating mechanism for reciprocating a rapier head, for example, there is a mechanism including a rapier band to which a rapier head is attached and a rapier wheel around which the rapier band is wound. As a means for converting a rotation in one direction into a reciprocating rotation, for example, there is one using a three-dimensional crank drive device as described in the section of the prior art of Japanese Patent Application Laid-Open No. 5-195373. The three-dimensional crank drive converts the rotational drive of the loom into reciprocal rotation of the rapier wheel. Due to such conversion of the movement form, the rapier head moves in and out once in the warp opening during one weft inserting cycle.

The optimum pattern of the weft insertion speed differs depending on the type of weft, but in the configuration in which the driving force of the reciprocating mechanism is obtained from the drive source of the loom, the weft insertion speed pattern corresponding to the type of weft cannot be selected.

Japanese Laid-Open Patent Publication Nos. 53-106865, 4-289240, and 5-195373 disclose a weft inserting device in which a rapier wheel is driven by a servomotor which is a variable speed drive motor. By adopting a servo motor, it is possible to select a weft insertion speed pattern according to the type of weft.

[0005]

There are two types of weft yarns, one of which is prone to thread breakage and the other of which is not prone to thread breakage. In addition, there are some types of weft yarns that are easy to catch with a rapier head and some types that are difficult to catch. If the moving speed of the rapier head at the time of catching the weft thread, which easily causes thread breakage, with the rapier head is too high, thread breakage occurs. If the moving speed of the rapier head when catching a weft yarn that is difficult to catch with the rapier head is too high, a catch error will occur. Further, wefts are classified into types that easily cause slack and types that hardly cause slack. If the weft yarn, which is apt to be loosened at the weft insertion end side, is released from the rapier head earlier, slackening occurs and the cloth quality deteriorates. Weft thread slack that causes deterioration of fabric quality is also a type of weft insertion error.

However, in the device disclosed in Japanese Patent Laid-Open No. 53-106865, nothing is mentioned about the speed of the rapier head when catching the weft with the rapier head.
Further, in the device disclosed in Japanese Patent Laid-Open No. 5-195373, a delivery rapier head (referred to as a giver in the publication) that enters the warp opening from the weft insertion start end side or the weft insertion end side enters the warp opening. The selection of the moving speed of the receiving rapier head (referred to as a taker in the publication) when the receiving rapier head approaches and separates near the weft transfer position is mentioned. However, nothing is mentioned about the speed of the rapier head when catching the weft thread with the rapier head.

In the apparatus disclosed in Japanese Patent Laid-Open No. 4-289240, the stroke of the rapier head can be changed. However, nothing is mentioned about how to change the stroke under what circumstances.

It is an object of the present invention to provide a weft inserting method in a rapier loom capable of preventing a weft insertion error by selecting a weft catching condition or a grip releasing condition by a rapier head according to a weft yarn type.

[0009]

To this end, the present invention inserts the rapier head into the warp shed and reciprocates the shed from the warp shed by means of a variable speed drive motor, and the reciprocating motion causes the rapier head to move into the warp shed. The present invention is directed to a rapier loom in which wefts are inserted to insert wefts. In the invention of claim 1, the rapier head is inserted into the warp shed by the forward rotation operation of the speed change drive motor, and the warp shed is rotated in the reverse direction by the speed change drive motor. The rapier head was retracted from the position, and the retracted dead center position of the rapier head that catches the weft yarn at the weft insertion start end side was changed according to the type of weft yarn.

According to a second aspect of the present invention, the rapier head is inserted into the warp shed by the forward rotation operation of the speed change drive motor, and the rapier head is retracted from the warp shed by the reverse operation of the speed change drive motor. The retracted dead center position of the rapier head that releases the weft is changed according to the type of weft.

In a third aspect of the present invention, the delivery rapier head and the reception rapier head are driven by a single variable speed drive motor, and the forward rotation operation of the variable speed drive motor causes the delivery rapier head and the reception rapier head to enter the warp shed. At the same time as inserting, the transfer rapier head and the receiving rapier head are retracted from the warp opening by the reverse rotation of the variable speed drive motor, and the retracted dead center positions of the transferring rapier head and the receiving rapier head are changed according to the weft type.

According to another aspect of the present invention, the delivery rapier head is driven by the first shift drive motor, and the receiving rapier head is driven by the second shift drive motor to drive the first shift drive motor and the second shift drive motor. The transfer rapier head and the receiving rapier head are inserted into the warp shed by the forward rotation operation of the drive motor, and the transfer rapier head and the receiving rapier head are warp shed by the reverse operation of the first variable speed drive motor and the second variable speed drive motor. The retracting dead center positions of the delivery rapier head and the receiving rapier head are changed according to the weft type.

[0013]

According to the first aspect of the invention, when the weft which is prone to yarn breakage is inserted, the retracted dead center position on the weft insertion start end side of the rapier head is selected so as to catch the weft at a speed that does not cut the weft. To be done. When a weft yarn that is unlikely to cause thread breakage is inserted, the retracted dead center position on the weft insertion start end side of the rapier head is selected so as to catch the weft yarn at a speed higher than the speed at which the weft is not cut.

Further, when a weft yarn which is difficult to be caught by the rapier head is inserted, the retracted dead center position on the weft insertion start end side of the rapier head is selected so as to catch the weft yarn at a speed that can surely catch the weft yarn. . When a weft that is easy to catch is inserted, the retracted dead center position on the weft insertion start end side of the rapier head is selected so that the weft is caught at a speed faster than the catchable speed.

According to the second aspect of the present invention, the retracting dead center position on the weft inserting end side of the rapier head is selected so as to delay the release timing of the weft when the weft which easily causes slack is inserted. When a weft yarn that is unlikely to cause slack is inserted, the retracted dead center position on the weft inserting end side of the rapier head is selected so as to advance the weft release timing.

According to the third aspect of the invention, the delivery rapier head driven by a single variable speed drive motor and the retracted dead center position of the reception rapier head are selected according to the weft type. Both retracted dead center positions are changed.

According to the invention of claim 4, the delivery rapier head and the retracting dead center position of the receiving rapier head which are driven by different variable speed drive motors are selected according to the weft type. Both retracted dead center positions are changed independently of each other.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment embodying the present invention will now be described with reference to FIG.
~ It demonstrates based on FIG. Reference numeral 1 is a delivery rapier head that is inserted into the opening of the warp (not shown) from the weft insertion start end side, and 2 is a reception rapier head that is inserted into the warp insertion from the weft insertion end side. Rapier heads 1, 2
Is fastened to the tips of the rapier bands 3 and 4, and the rapier bands 3 and 4 are wound around and connected to the rapier wheels 5 and 6. The rapier wheel 5 is reciprocally rotated by a servo motor 7 that serves as a first shift drive motor. The rapier wheel 6 is a servo motor 8 serving as a second variable speed drive motor.
It is reciprocally rotated by. The servo motors 7 and 8 reciprocate in opposite directions.

The delivery rapier head 1 is inserted into the warp opening by the forward rotation of the rapier wheel 5, and the delivery rapier head 1 retracts from the warp opening by the backward rotation of the rapier wheel 5. The rapier band 3 and the rapier wheel 5 constitute a reciprocating mechanism that performs a reciprocating motion of inserting the delivery rapier head 1 into the warp opening and retracting it from the warp opening. The receiving rapier head 2 is inserted into the warp opening by the forward rotation of the rapier wheel 6, and retracts from the warp opening by the backward rotation of the rapier wheel 6. The rapier band 4 and the rapier wheel 6 constitute a reciprocating mechanism that performs a reciprocating motion of inserting the receiving rapier head 2 into the warp opening and retracting it from the warp opening.

A forward rapier head 1 for receiving and a receiving rapier head 2 by the forward rotation of the rapier wheels 5, 6.
Enters the warp shed and both rapier heads 1 and 2 meet near the central portion of the weaving width as shown by the chain line in FIG. The weft yarn (not shown) conveyed into the warp opening by the delivery rapier head 1 is delivered to the reception rapier head 2. By the backward rotation of the rapier wheels 5 and 6, the delivery rapier head 1 and the reception rapier head 2 retract from the warp opening, and the weft thread is passed through the warp opening.

Both rapier heads 1 and 2 run on a sley 10 which supports a reed 9. Slei 10 is Slei Sword 11
It is supported on the swing shaft 12 via. The sley 10 swings integrally with the swing shaft 12 about the swing shaft 12.

A drive shaft 13 is rotatably arranged just below the swing shaft 12. The drive shaft 13 is parallel to the swing shaft 12. A driven gear 14 is fixed to the drive shaft 13. A servo motor 15 is installed near the drive shaft 13. A drive gear 16 is fixed to the output shaft 15a of the servomotor 15. The driving gear 16 is the driven gear 14
And the rotation of the servo motor 15 is driven by the drive gear 1
6 and the driven gear 14 to be transmitted to the drive shaft 13.
The servomotor 15 rotates only in one direction, and the drive shaft 13 rotates only in one direction.

At both ends of the drive shaft 13, crankshafts 17, 1 are provided.
8 are connected. Crankshaft 17, 18 and swing shaft 1
The both ends of 2 are connected by connecting rods 19 and 20. The crank mechanism including the crankshafts 17 and 18 and the connecting rods 19 and 20 has a drive shaft 1
3 in one direction is converted into reciprocating rotation of the swing shaft 12.

The servomotors 7, 8 and 15 are amplifier circuits 2
Command control of the control computer C is performed via 1, 22, and 23. The control computer C inputs the weft insertion position pattern preset by the input device 24 for each weft type, the loom rotation angle detection information obtained from the rotary encoder 25 for detecting the rotation angle of the loom, and the servo motor 7,
Rotary encoders 7a, 8a for detecting the rotation angle of 8
Based on the rotation angle information obtained from the servo motor 7,
The rotation speed of 8 is feedback-controlled. The control computer C also detects the beating speed pattern preset by the input device 24 for each weft type, the loom rotation angle detection information obtained from the rotary encoder 25, and the rotary encoder 15 for detecting the rotation angle of the servo motor 15.
Servo motor 1 based on the rotation angle information obtained from b
The rotation speed of 5 is feedback-controlled.

The vertical axis θ in FIGS. 2 and 3 represents the rotational angle position of the loom. The horizontal axis L in FIG. 3 represents the weft insertion position. Curves EL ₀ and EL _{1 in} FIG. 3 represent weft insertion position curves of the delivery rapier head 1. The curve ER ₀ represents the weft insertion position curve of the receiving rapier head 2. Curves DL ₀ and DL _{1 in} FIG. 2 represent rotational speed curves of the servo motor 7 corresponding to the weft insertion position curves EL ₀ and EL ₁ . A curve DR ₀ represents a rotation speed curve of the servo motor 8 corresponding to the weft insertion position curve ER ₀ . Weft insertion position curve EL ₀ result in rotational speed curve DL _0, DR ₀ in the present embodiment,
ER ₀ is used as a weft insertion position pattern for weft insertion of a weft having a strong yarn strength. Rotational speed curves DL ₁ and DR ₀
The weft-insertion position curves EL ₁ and ER ₀ that bring about are used as a weft-insertion position pattern for weft-inserting a weft having a weak yarn strength.

In this embodiment, it is premised that a weft yarn Y ₀ having a strong yarn strength and a weft yarn Y ₁ having a weak yarn strength are inserted. The curves EL ₀ and ER ₀ are weft-insertion position patterns selected when weft-inserting the weft yarn Y _{0 having} strong yarn strength,
The curves EL ₁ and ER ₀ are weft-insertion position patterns selected when weft-inserting the weft Y _{1 having} a weak yarn strength. The control computer C selects the weft insertion position patterns EL ₀ , ER ₀ or EL ₁ , ER ₀ according to the weft insertion order of the wefts Y ₀ , Y ₁ . That is, the weft Y ₀ is weft-inserted at the weft insertion speed represented by the rotation speed curves DL ₀ and DR ₀ , and the weft Y ₁ is the rotation speed curve D
Weft insertion is performed at the weft insertion speed represented by L ₁ and DR ₀ .

L ₁ shown in FIG. 3 is a weft insertion position where the weft yarn is caught by the delivery rapier head 1. The angle θx ₀ is a timing angle at which the weft yarn Y ₀ is caught by the delivery rapier head 1, and the angle θx ₁ is a timing angle at which the weft yarn Y ₁ is caught by the delivery rapier head 1. Velocity V ₁ of the delivery rapier head 1 at the time of catching the weft Y ₁ as shown in FIG. 2 delivery rapier head 1 at the time of catching the weft Y ₀
Is lower than the speed V ₀ .

L shown in FIG.₂Is a rapier head for delivery
1 shows the weft insertion position where it enters the rocking area of the reed 9 and starts.
Then L₃The receiving rapier head 2 is in the swinging area of the reed 9.
It represents the weft insertion position where it starts to enter. L_FourIs received
Insert for releasing the weft held by the rapier head 2
The position. Angle θ₁Is the repier head 1 for delivery
9 is the timing angle at which it starts entering the swinging region and starts.
It Angle θ₂The transfer rapier head 2 swings the reed 9
It is a timing angle for retreating from the area. Angle θ ₃Is received
The rapier head 2 for skidding enters the rocking area of the reed 9 and opens.
It is the timing angle to start. Angle θ_FourIs for receipt
Timing at which the pier head 2 retracts from the swing area of the reed 9
It is an angle. Angle θy₀Is the receiving rapier head 2
It is a timing angle at which the weft yarn being gripped is released.

As shown in FIG. 3, the transfer and arrangement timing of the delivery rapier head 1 is such that the rotation angle θ is θ ₁ ≤θ≤θ _2.
The same applies to both wefts Y ₀ and Y ₁ in the range of. However, in the range of 0 ° ≦ θ ≦ θ ₁ and θ ₂ ≦ θ ≦ 360 °, the moving and arranging timing of the delivery rapier head 1 is different for each weft Y ₀ , Y ₁ . Reed 9 has rotation angle θ = 0
Beat the weft yarn at °. During the period immediately before the rapier heads 1 and 2 enter the swinging region of the reed 9 and immediately after the retreat, the reed 9 is retracted and stopped at the final retracted position where it does not interfere with the weft insertion path of the rapier heads 1 and 2. On the contrary, 0 °
In the range of ≦ θ ≦ θ ₁ and θ ₂ ≦ θ ≦ 360 °, the reed 9 performs a beating operation, and during this period, the delivery rapier head 1
Is retracted outward from the weft inserting position L ₂ . The position at which the delivery rapier head 1 is retracted to the maximum from the weft insertion position L ₂ , that is, the retracted dead center position is different for each weft Y ₀ , Y ₁ . Passing rapier head 1 during the weft insertion Y ₀ moves the weft insertion position curve EL ₀ above, retraction dead center position on the weft insertion position curve EL ₀ vertical axis θ and weft insertion in the left side of FIG. 3 Position curve E
It is a contact point with L ₀ . That is, when the weft Y ₀ is inserted, the retracting dead center position of the delivery rapier head 1 is at the position L ₀ on the horizontal axis L. Passing rapier head 1 during the weft insertion Y ₁ moves the weft insertion position curve EL ₁ above, retraction dead center position on the weft insertion position curve EL ₁ position L ₅ on the horizontal axis L of FIG. 3 It is in. The retracted dead center position of the receiving rapier head 2 is at the position L ₆ on the horizontal axis L.

The solid line position of the delivery rapier head 1 shown in FIG. 1 corresponds to the retracted dead center position L _0, and the chain line position on the left side of the delivery rapier head 1 corresponds to the retracted dead center position L ₅ . The position of the receiving rapier head 2 in FIG. 1 corresponds to the retracted dead center position L ₆ .

The selection of the retracting dead center positions L ₀ and L ₅ of the delivery rapier head 1 as described above makes a difference in the speed of the delivery rapier head 1 when the wefts Y ₀ and Y ₁ are caught by the delivery rapier head 1.

The weft Y by the delivery rapier head 1
Velocity V ₁ of the delivery rapier head 1 at the time of catch ₁ is slow, weak weft Y ₁ yarn strength is weft insertion without causing yarn breakage. On the other hand, the velocity V ₀ of the delivery rapier head 1 when catching the weft yarn Y ₀ by the delivery rapier head 1 is high, but the weft yarn Y ₀ having a strong yarn strength is weft-inserted without causing yarn breakage.

As a weft insertion error in the rapier loom,
There is a catch failure other than the thread breakage at the time of catching the weft thread of the rapier head 1 at the start of weft insertion. There are some types of wefts that are easy to catch and some types that are difficult to catch, but it is also possible to change the retracted dead center position of the rapier head 1 to change the weft catch speed pattern according to the difficulty of catching. By selecting the speed for catching the weft in accordance with the type of weft, thread breakage or failure in catching the weft can be prevented.

The weft-insertion position pattern EL ₀ used for weft-insertion of wefts that are difficult to break is a sine curve. In this curve, the servo motor 7 in the range of the angle 0 ° ≦ θ ≦ θ ₁ and the angle θ ₂ ≦ θ ≦ 360 ° which is the beating timing range is shown.
Rotation speed fluctuation is less than that of the weft insertion position pattern EL ₁ . The small fluctuation of the rotation speed of the servo motor 7 enhances the accuracy of the movement arrangement timing of the rapier head 1. Further, the small fluctuation of the rotation speed of the servo motor 7 causes the servo motor 7 to operate at high speed. When only wefts that are difficult to break are inserted, the servo motor 7 can be sped up and the weaving efficiency can be improved.

The transfer arrangement timing of the delivery rapier head 1 is the same for both the weft yarns Y ₀ and Y ₁ in the range of θ ₁ ≦ θ ≦ θ ₂ which is the weft insertion timing range. Such a movement arrangement timing configuration facilitates the setting of the weft insertion position pattern and the speed control of the servomotor 7.

Next, the embodiment shown in FIGS. 4 and 5 will be described.
The device configuration is the same as in the first embodiment. A curve EL _{0 in} FIG. 5 represents a weft insertion position curve of the delivery rapier head 1. The curves ER ₀ and ER ₁ represent the weft insertion position curves of the receiving rapier head 2. A curve DL _{0 of} FIG. 4 represents a rotation speed curve of the servomotor 7 corresponding to the weft insertion position curve EL ₀ . Curve D
R ₀ and DR ₁ represent rotation speed curves of the servo motor 8 corresponding to the weft insertion position curves ER ₀ and ER ₁ . In this embodiment, the weft insertion position curves EL ₀ , ER that bring about the rotational speed curves DL ₀ , DR _0
0 is used as a weft insertion position pattern for weft insertion of a weft that is difficult to break and stretch. Weft insertion position results in a rotational speed curve DL _0, DR ₁ curve EL _0, ER ₁
Is used as a weft-insertion position pattern for weft-inserting a weft that is hard to break and easily expands and contracts.

[0037] it is assumed that the likely weft yarn Y ₄ retracts difficult and elongation and hard weft Y ₃ and yarn breakage contraction difficult and elongation and yarn breakage in this embodiment is weft insertion. Curve E
L ₀ and ER ₀ are weft-insertion position patterns that are selected when weft-inserting the weft Y ₃ that is hard to break and stretch and shrink. The curves EL ₀ and ER ₁ are weft-insertion position patterns that are selected when weft-inserting the weft Y ₄ which is hard to break and easy to expand and contract. The control computer C controls the weft Y ₃ ,
Weft-insertion position patterns EL ₀ , E according to the weft-insertion order of Y _4.
Select R ₀ or EL ₀ , ER ₁ . That is, the weft Y ₃ is weft-inserted at the weft-insertion speed represented by the rotation speed curves DL ₀ and DR ₀ ,
The weft Y ₄ is weft-inserted at the weft-insertion speed represented by the rotation speed curves DL ₀ and DR ₁ .

The angle θy ₀ shown in FIG. 5 is a timing angle for releasing the weft yarn Y _{3 held} by the receiving rapier head 2, and the angle θy ₁ releases the weft yarn Y _{4 held} by the receiving rapier head 2. The timing angle.

As shown in FIG. 5, the weft yarns Y ₃ and Y ₄ are the same for both of the weft yarns Y ₃ and Y ₄ within the range of θ ₃ ≤θ≤θ ₄ . But,
In the range of 0 ° ≦ θ ≦ θ ₃ and θ ₄ ≦ θ ≦ 360 °, the movement arrangement timing of the receiving rapier head 2 differs for each weft Y ₃ , Y ₄ . The position at which the receiving rapier head 2 is retracted to the maximum from the weft inserting position L ₃ , that is, the retracted dead center position is different for each weft Y ₃ , Y ₄ . Receiving rapier head 2 during the weft insertion Y ₃ moves the weft insertion position curve ER ₀ above, retraction dead center position on the weft insertion position curve ER ₀ in FIG. 5
Is the contact point between the vertical axis θ on the right side of and the weft insertion position curve ER ₀ .
That is, when the weft Y ₃ is inserted, the retracting dead center position of the receiving rapier head 2 is at the position L ₆ on the horizontal axis L. Receiving rapier head 2 during the weft insertion of the weft yarn Y ₄ moves the weft insertion position curve ER ₁ above, the position L ₇ on the horizontal axis L of the retraction dead center position of the weft inserting position curve ER ₁ Figure 5 It is in. Such retracting dead center positions L ₆ and L of the receiving rapier head 2
Selection of ₇ picks wefts Y ₃ and Y ₄ rapier head 2 for receiving
Make a difference in the timing to release from.

The timing θy ₁ for releasing the weft Y ₄ from the receiving rapier head 2 is the receiving rapier head 2
Is later than the timing θy ₀ for releasing the weft yarn Y ₃ . When the weft Y ₄ which easily expands and contracts is quickly released from the receiving rapier head 2, the weft Y ₄ is pulled back before it is beaten on the cloth fell of the woven fabric, resulting in a weft insertion error such as looseness of the weft. The looseness of the weft reduces the quality of the woven fabric. However, since the weft yarn Y ₄ which easily expands and contracts is held by the receiving rapier head 2 until the beating time θ = 0 °, the weft yarn Y ₄ is not pulled back.

The timing for moving and arranging the receiving rapier head 2 is the same for both the wefts Y ₃ and Y ₄ within the range of θ ₃ ≤ θ ≤ θ ₄ . Such a movement layout timing configuration facilitates setting of the weft insertion position pattern and speed control of the servo motor 8.

Next, the embodiment shown in FIGS. 6 and 7 will be described. The device configuration of this embodiment is the same as that of the first embodiment. Curves EL ₀ and EL _{2 in} FIG. 7 represent weft insertion position curves of the delivery rapier head 1. Curves ER ₀ and ER ₂ represent weft insertion position curves of the receiving rapier head 2. Curves DL ₀ and DL _{2 in} FIG. 6 represent rotational speed curves of the servo motor 7 corresponding to the weft insertion position curves EL ₀ and EL ₂ . Curves DR ₀ and DR ₂ represent rotational speed curves of the servo motor 8 corresponding to the weft insertion position curves ER ₀ and ER ₂ . Weft insertion position curve EL _0, ER ₀ to bring the rotational speed curve DL _0, DR ₀ in the present embodiment is used as the weft insertion position pattern for weft insertion yarn breakage hardly and elongation shrinkage hard weft. Weft insertion position curve EL _2, ER ₂ to provide a rotational speed curve DL _2, DR ₂ is used as the weft insertion position pattern for weft insertion the easy weft retracts easily and elongation and yarn breakage.

In this embodiment, it is premised that the weft yarn Y _{3 which} is difficult to break and stretch and shrink and the weft yarn Y ₅ which is easy to break and stretch and shrink are inserted. Curve E
L ₀ and ER ₀ are weft-insertion position patterns that are selected when weft-inserting the weft Y ₃ that is hard to break and stretch and shrink. The curves EL ₂ and ER ₂ are weft-insertion position patterns selected when weft-inserting the weft Y ₅ which is easy to break and stretch easily. The control computer C controls the weft Y ₃ ,
Weft-insertion position patterns EL ₀ , E according to the weft-insertion order of Y ₅
Select R ₀ or EL ₂ , ER ₂ . That is, the weft Y ₃ is weft-inserted at the weft-insertion speed represented by the rotation speed curves DL ₀ and DR ₀ ,
The weft yarn Y ₅ is weft-inserted at the weft-insertion speed represented by the rotation speed curves DL ₂ and DR ₂ .

The angle θx ₀ shown in FIG. 7 is the timing angle at which the delivery rapier head 1 catches the weft Y ₃ , and the angle θx ₂ is the weft yarn Y _{5 by the} delivery rapier head 1.
Is the timing angle to catch. The angle θy ₀ is a timing angle for releasing the weft yarn Y _{3 held} by the receiving rapier head 2, and the angle θy ₂ is a timing angle for releasing the weft yarn Y _{5 held} by the receiving rapier head 2.

A receiving rapier head as shown in FIG.
The timing for moving and arranging 2 is θ₃≤ θ ≤ θ_FourIn the range of
Thread Y₃, Y_FourIs the same for both. 0 ° ≦ θ
≤ θ ₃And θ_FourWithin the range of ≦ θ ≦ 360 °
The timing at which the pier head 2 is moved and arranged is the weft Y.₃, Y_Fiveevery
Different to The delivery rapier head 1 is at the weft insertion position L ₂
The position that is retracted to the maximum from
Y₃, Y_FiveDifferent for each. Also, the receiving rapier head 2
Is the weft insertion position L₃From the maximum retracted position, that is, withdrawal
Point position is weft Y₃, Y_FiveDifferent for each.

The delivery rapier head 1 during the weft insertion Y ₃ moves the weft insertion position curve EL ₀ above, retraction dead center position on the weft insertion position curve EL ₀ is located on the horizontal axis L L ₀ It is in. At the time of weft insertion of the weft Y _5, the delivery rapier head 1 moves on the weft insertion position curve EL ₂ and the weft insertion position curve E
The retracted dead center position on L ₂ is at position L ₈ on the horizontal axis L. Such a retracted dead center position L _{0 of} the delivery rapier head 1
The selection of L ₈ makes a difference in the speed at which the weft yarns Y ₃ and Y ₅ are caught by the delivery rapier head 1.

The receiving rapier head 2 during the weft insertion Y ₃ moves the weft insertion position curve ER ₀ above, retraction dead center position on the weft insertion position curve ER ₀ in position on the horizontal axis L L ₆ It is in. At the time of weft insertion of the weft Y _5, the receiving rapier head 2 moves on the weft insertion position curve ER ₂ , and the weft insertion position curve E
The retracted dead center position on R ₂ is at position L ₉ on the horizontal axis L. Such a retracted dead center position L _{6 of} the receiving rapier head 2
The selection of L ₉ makes a difference in the timing of releasing the wefts Y ₃ and Y ₅ from the receiving rapier head 2.

The selection of the weft insertion position pattern of this embodiment for preventing both thread breakage and weft slack is possible by the structure in which the delivery rapier head 1 and the reception rapier head 2 are driven by separate servomotors 7 and 8. .

In each of the above embodiments, the angle θ ₁ ≤ θ ≤ θ
_In the range of ₂ , the weft insertion position pattern is unchanged, but it can be changed according to the weft type. The present invention can also be applied to the embodiment of the apparatus configuration shown in FIG. In this embodiment, the first
The servo motor 8 of the embodiment is omitted. A drive pulley 26 is fixed to the output shaft 7b of the servomotor 7 connected to the rapier wheel 5, and a drive gear 28 is fixed to the drive shaft 27 connected to the rapier wheel 6. An intermediate shaft 29 is rotatably disposed near the drive shaft 27, and a driven pulley 30 and an intermediate gear 31 are fixed to the intermediate shaft 29. The drive pulley 26 and the driven pulley 30 are connected by a timing belt 32. The rotation of the servo motor 7 is transmitted to the intermediate shaft 29 via the drive pulley 26, the timing belt 32, and the driven pulley 30. The rotation of the intermediate shaft 29 is controlled by the intermediate gear 31 and the drive gear 28.
Is converted to reverse rotation of the rapier wheel 6, and the rapier wheels 5 and 6 rotate in mutually opposite directions. The weft insertion position patterns of the rapier heads 1 and 2 in this embodiment are changed at the same time.
The configuration in which 2 is driven by a single servo motor 7 is advantageous in terms of cost.

In the present invention, a stepping motor may be used as the variable speed drive motor, or a mechanism such as a crank mechanism or a cam mechanism may be used as a part of the power transmission system between the variable speed drive motor and the rapier wheel. Is.

Further, the present invention can be applied to a rapier loom in which a rapier head is fixed to the tip of a rod that reciprocates linearly. The technical ideas other than the claims that can be understood from each of the embodiments will be described below along with their effects. (1) In the invention described in claim 1, the weft insertion position of the rapier head is divided into a weft insertion timing range and a beating timing range including a retract dead center position on the weft insertion start end side, and the weft insertion timing range is set. A weft insertion method for a rapier loom whose position pattern is unchanged. (2) In the invention according to claim 2, the weft insertion position of the rapier head is divided into a weft insertion timing range and a beating timing range including a retract dead center position on the weft insertion end side, and the weft insertion timing range is inserted. A weft insertion method for a rapier loom whose position pattern is unchanged. (3) In the invention according to any one of claims 3 and 4, the weft insertion position of the delivery rapier head includes a first weft insertion timing range and a retreat dead center position on the weft insertion start end side. The weft insertion position of the receiving rapier head is divided into a second weft insertion timing range and a beating timing range including the retracted dead center position on the weft insertion end side, so that the first and second weft insertions are performed. A weft insertion method for a rapier loom in which the weft insertion position pattern in the timing range is unchanged.

In any of the inventions (1), (2), and (3), the construction in which a part of the weft insertion position pattern is invariable is easy to set the weft insertion position pattern and speed control of the variable speed drive motor. Bring ease.

[0053]

As described above in detail, according to the present invention, the withdrawal dead center position of the rapier head for catching the weft yarn at the weft insertion start end side or the withdrawal dead center position of the rapier head for releasing the weft yarn at the weft insertion end side is set as the weft type. The weft insertion error can be prevented by selecting the weft catching condition or grip releasing condition by the rapier head according to the weft yarn type.

[Brief description of drawings]

FIG. 1 is a schematic front view of a first embodiment embodying the present invention.

FIG. 2 is a graph showing a rotation speed curve of a servo motor.

FIG. 3 is a graph showing a weft insertion position pattern of a rapier head.

FIG. 4 is a graph showing a rotation speed curve of a servo motor of another example.

FIG. 5 is a graph showing a weft insertion position pattern of a rapier head.

FIG. 6 is a graph showing a rotation speed curve of a servo motor of another example.

FIG. 7 is a graph showing a weft insertion position pattern of a rapier head.

FIG. 8 is a schematic front view of another example.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Delivery rapier head, 2 ... Reception rapier head, 7, 8 ... Servo motor which is a variable speed drive motor, C
... control _{computer, L 0, L 5, L} 6, L 7, L 8,
L ₉ ... retreat dead center position.

Claims (4)

[Claims] 1. A rapier loom in which a rapier head is inserted into a warp shed and at the same time a reciprocating motion for retracting from the warp shed is performed by a variable speed drive motor, and the reciprocating motion inserts the rapier head into the warp shed to insert a weft. In, the rapier head is inserted into the warp shed by the forward rotation operation of the speed change drive motor, and the rapier head is retracted from the warp shed by the reverse operation of the speed change drive motor, and the rapier head is retracted to catch the weft thread at the weft insertion start end side. A weft insertion method in a rapier loom that changes the point position according to the type of weft. 2. A rapier loom in which a rapier head is inserted into a warp shed and a reciprocating motion for retracting from the warp shed is performed by a variable speed drive motor, and the reciprocating motion inserts the rapier head into the warp shed to insert a weft. In, the rapier head is inserted into the warp shed by the forward rotation operation of the speed change drive motor, and the rapier head is retracted from the warp shed by the reverse operation of the speed change drive motor and the weft thread is released at the weft inserting end side. A weft insertion method in a rapier loom that changes the point position according to the type of weft. 3. A transfer rapier head and a receiving rapier head are inserted into the warp shed, and a reciprocating motion for retracting from the warp shed is performed by a variable speed drive motor, and the reciprocating motion inserts both the rapier heads into the warp shed. In a rapier weaving machine that transfers wefts from a delivery rapier head to a reception rapier head and puts them in a weft, the delivery rapier head and the reception rapier head are driven by a single variable speed drive motor, and the forward rotation operation of the variable speed drive motor causes the forward and reverse operations. The rapier head and the receiving rapier head are inserted into the warp yarn opening, and the transfer rapier head and the receiving rapier head are retracted from the warp yarn opening by the reverse operation of the variable speed drive motor.
A weft insertion method for a rapier loom, wherein the delivery rapier head and the retracted dead center position of the reception rapier head are changed according to the weft type. 4. A transfer rapier head and a receiving rapier head are inserted into the warp shed, and a reciprocating motion for retracting the warp shed from the warp shed is performed by a variable speed drive motor, and the reciprocating motion inserts both rapier heads into the warp shed. In a rapier weaving machine that transfers wefts from a delivery rapier head to a reception rapier head and puts in the weft, the delivery rapier head is driven by a first speed change drive motor, and the reception rapier head is driven by a second speed change drive motor. The forward rapier head and the receiving rapier head are inserted into the warp shed by the forward rotation operation of the first variable speed drive motor and the second variable speed drive motor, and the reverse operation of the first variable speed drive motor and the second variable speed drive motor is performed. Delivery rapier head and delivery rapier head A weft insertion method in a rapier loom in which the pad is retracted from the warp shed and the delivery rapier head and the retracted dead center position of the reception rapier head are changed according to the weft type.