JPH11100751A - Weft selection system in rapier loom - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the subject selection system wherein the rectilinear motion of a mobile member feeding a waft selectively between waiting position and picking position can be directly driven, by a simple driving means. SOLUTION: This weft selection system is designed to move a weft 2 threaded through the yarn guide 4 of a mobile member 3 provided for each of a plurality of wefts 2 to a picking position capable of catching the weft by a rapier 9 to effect picking the weft 2 after caught by the rapier 9, wherein the system is composed of a plurality of linear motors 7 each set up along the reciprocatingly moving direction of the above corresponding mobile member 3 and a control unit 8 having such a mechanism as to select one of the linear motors 7 corresponding to a weft 2 to be picked based on the selective pattern of the weft 2 and reciprocatingly drive the selected linear motor 7 synchronously with the rotation of the main shaft 20 of the loom.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a weft selecting device for guiding a selected weft to a weft insertion position, that is, a position that can be captured by a rapier in a multicolor rapier loom.

[0002]

2. Description of the Related Art A conventional weft selecting device of this type is disclosed, for example, in Japanese Patent Application Laid-Open No. 3-119151 (mechanical type).
Or a rotary motion obtained by an electric (servo motor) drive source as disclosed in JP-A-6-192944 or JP-A-9-158001, by linear motion or motion conversion means such as a lever or crank. Converting to a swinging motion, reciprocating the finger or the movable member corresponding to the finger between the standby position and the weft insertion position,
At the weft insertion position, the rapier weft yarn is selectively supplied.

[0003] According to the above-mentioned prior art, since the rotational motion is converted into a linear motion or a oscillating motion, when the loom speeds up, the inertia force of the motion converting means increases in the process of converting the motion. However, wear is likely to occur at the fulcrum of the mechanical element of the motion converting means, which is not only an obstacle to speeding up the loom, but also the cost is increased due to the addition of the motion converting means. .

[0004]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a weft selecting device for a rapier loom, in which linear motion of a movable member which selects and supplies a weft to a standby position and a weft insertion position is directly performed using simple driving means. And remove the disadvantages of the prior art.

[0005]

To achieve the above object, according to the present invention, a movable member provided for each of a plurality of wefts is selectively operated to wait for a weft thread passed through a thread guide of the movable member. In a weft yarn selection device of a rapier loom that reciprocates between a position and a weft insertion position at which the yarn can be captured by the rapier, and captures and inserts the weft at the weft insertion position by the rapier, in the reciprocating direction of each of the movable members, A linear motor having a plurality of coils arranged along a stator and a mover that reciprocates the movable member by a traveling magnetic field generated by the coils, and a weft inserted into the weft according to a weft selection pattern. With a control device that selects a linear motor and drives the selected linear motor in the reciprocating direction in synchronization with the rotation of the main shaft of the loom, weft selection of the rapier loom Constitute a location.

According to a second aspect of the present invention, in the weft selecting device for a rapier loom similar to the first aspect, a plurality of coils and coils arranged on a stator along a reciprocating direction of each of the movable members are provided. A linear motor having a mover that reciprocates the movable member by the generated traveling magnetic field, a sensor that detects a standby position and a weft insertion position of the mover to generate a position signal, and a weft yarn selection pattern. A linear motor corresponding to the weft thread to be inserted, and a control device that drives the selected linear motor in a reciprocating direction by a position signal from the sensor in a state synchronized with the rotation angle of the main shaft of the loom. It constitutes the weft selecting device of the loom.

[0007]

FIG. 1 shows a weft selecting device 1 of a rapier loom. Each of the plurality of weft yarns 2 is supplied from a yarn feeder (not shown), passed through a corresponding yarn guide 4 at the tip of a movable member 3, and near a weaving cloth 6 of the woven cloth 5.
It is connected to the weaving edge. These movable members 3 can reciprocate between a standby position indicated by a solid line in FIG. 1 and a weft insertion position indicated by a two-dot chain line, that is, a position where the yarn can be captured by the rapier 9. It is designed to be driven. The linear motor 7
Are constituted by an induction type linear motor, a linear DC motor, a linear pulse motor, a linear synchronous motor, and the like, and are controlled by a common control device 8.

The control device 8 selects and drives one linear motor 7 corresponding to the weft yarn 2 to be weft-inserted based on the selection pattern of the weft yarn 2, and moves the movable member 3 from the standby position to the weft-insertion position. Then, the weft 2 of the movable member 3 is moved to a position where it can be captured by the rapier 9. Therefore, the rapier 9 catches the weft yarn 2 moving to the weft insertion position and moves it into the opening 11 formed by the warp yarn 10 in the process of moving in the weft insertion direction. After the insertion, the control device 8 drives the selected linear motor 7 in the backward direction,
The movable member 3 at the horizontal insertion position is retracted to the standby position.

FIG. 2 shows the configuration of an induction type linear motor 7 as an example. The induction type linear motor 7 is assembled by a stator 12 and a mover 13.
The stator 12 is provided along the direction of the reciprocating linear motion of the movable member 3. For example, teeth and grooves are punched and formed in a silicon steel plate, a large number of them are stacked, and a plurality of coils 14 are provided in each groove. It is housed in a wound state, and is fixed to an outer frame or the like of a linear motor (not shown). Mover 13
Is a conductive non-magnetic material made of a copper plate, aluminum, or the like, is incorporated so as to be movable in the reciprocating direction of the movable member 3 so as to face the coil 14, and is directly or appropriately connected to one end of the movable member 3. They are connected by a connecting member or the like.

[0010] A sensor 15 for detecting a standby position is provided near the retracted position of the movable member 13.
A sensor 16 for detecting the insertion position is installed near the forward position of the vehicle. These sensors 15 and 16 are reflection type proximity sensors each including a light emitting diode and a phototransistor. When the front of the sensors 15, 16 is blocked by the mover 13, the sensors 15, 16 are turned off, and when not blocked, the sensors 15, 16 are turned on. Strictly speaking, the mounting position of these sensors 15 and 16 is set slightly before the stop position above or below the mover 13 in anticipation of the overrun after the mover 13 stops. When the mover 13 is stopped at any position, a thrust enough to overcome the gravity and the tension of the weft thread 2 applied to the yarn guide 4 is applied to the mover 13, and the mover 13 is moved to its stop position. To maintain.

Next, FIG. 3 shows an electrical configuration of a control device 8 for controlling the induction type linear motor 7. The control device 8 includes a control unit 17 including a microcomputer or the like. The control unit 17 includes an input unit 18
On the basis of the selection pattern of the weft thread 2 input by the user and the operation pattern input by the input means 19,
A weft selected in response to the rotation angle θ of the main shaft 20 of the loom as an input, and in synchronization with the movement of the main shaft 20 and, if necessary, as input signals from the standby position sensor 15 and the weft insertion position sensor 16. 2 is controlled to drive the corresponding linear motor 7. The rotation angle θ of the main shaft 20 is detected by an encoder 22 connected to the main shaft 20.

The operator operates the input means 18 to
The selection pattern of the multicolor (plural) weft yarns 2 is input to the control unit 17 and the input unit 19 is operated to set the operation pattern, that is, the speed and acceleration pattern of the linear motor 7, the operation timing, and the like. 17 and then into its internal storage area.

During operation of the rapier loom, the control unit 17 detects a weft insertion cycle from one rotation of the main shaft 20, detects a weft yarn selection timing from the rotation angle θ, and selects the weft yarn selection timing according to the selection pattern. The motor drive unit 21 for one weft yarn 2 is selected, and a drive signal corresponding to the number of revolutions of the loom is output therefrom by frequency conversion control to drive the linear motor 7 in the advance direction, that is, in the direction from the standby position to the weft insertion position. Thereby, the selected weft yarn 2 is moved to the weft insertion position, that is, the position where the rapier 9 can catch it.

At this time, the controller 17 confirms the standby position of the movable member 3 by a signal (ON / OFF signal) from the sensor 15 at the standby position, activates the linear motor 7 and The arrival at the weft insertion position is confirmed by a signal (ON / OFF signal) from the sensor 16, and the drive of the linear motor 7 is stopped at that time.

Accordingly, the rapier 9 catches the weft yarn 2 guided to the weft insertion position during the movement in the weft insertion direction, and inserts the weft yarn 2 into the inside of the opening 11 of the warp yarn 10. The control unit 17 detects the end timing of the weft insertion from the rotation angle θ, and then detects the sensor 1 of the weft insertion position.
The driving direction is changed by the frequency conversion control and the polarity conversion control of the linear motor 7 from the output state of the signal from the movable member 3.
By moving the movable member 3 backward, the weft thread 2 is moved from the weft insertion position to the standby position.

As described above, the control section 17 synchronizes with the main shaft 20 of the loom based on the weft thread selection pattern, and controls the standby position sensor 15 and the weft insertion position sensor 16.
By driving the linear motor 7 in the forward / backward direction by the motor driving unit 21 while detecting the signal of, the movable member 3 is reciprocated, and the weft 2 is guided from the standby position to the weft insertion position. At the end of the weft insertion of the weft thread 2, the weft thread is moved from the weft insertion position to the standby position.

Further, the momentum of the movable member 3 can be easily changed by changing the mounting positions of the position sensors 15 and 16, but the operation is performed by a solenoid or the like instead of the upper and lower position sensors 15 and 16. By disposing a stopper or the like for stopping and supporting the movable member 3 and electrically controlling the stopper, the momentum of the movable member 3 can be changed during the operation of the loom.

If the operation pattern is input by the input means 19 as a reciprocating motion corresponding to the rotation angle θ, the control unit 17 automatically changes the driving direction and the driving speed of the linear motor 7 according to the rotation angle θ. Therefore, the sensor 15 at the standby position and the sensor 16 at the weft insertion position are not required.

A magnetoresistive linear encoder is incorporated in the linear motor 7, and the current position information of the movable member 3 is input from the magnetoresistive linear encoder to the control unit 17, and the desired position set and input to the control unit 17 is input. By outputting a stop command to the linear motor 7 when the movable member 3 comes to the position, the momentum of the movable member 3 can be changed during the operation of the loom.

[0020]

According to the present invention, in the weft selecting device of the rapier loom, the reciprocating motion of the movable member for selectively arranging the weft in the standby position and the weft insertion position can be directly performed by using the linear motor. Therefore, the number of parts is reduced, maintenance is easy, and high speed of the loom can be realized.

According to the sensor provided for each stand-by and weft insertion position, the actual moving position of the movable member does not shift, and the stand-by position and weft insertion position can be easily changed by changing the sensor mounting position. Since it can be changed, it is possible to easily change the amount of reciprocation of the movable member.

[Brief description of the drawings]

FIG. 1 is a perspective view of a weft selecting device of a rapier loom of the present invention.

FIG. 2 is a principle sectional view of a linear motor.

FIG. 3 is a block diagram of a control device for a linear motor.

[Explanation of symbols]

 Reference Signs List 1 Weft selecting device of rapier loom 2 Weft 3 Moving member 4 Thread guide 5 Woven cloth 6 Weaving 7 Linear motor 8 Control device 9 Rapier 10 Warp 11 Opening 12 Stator 13 Mover 14 Coil 15 Standby position sensor 16 Weft insertion position Sensor 17 control unit 18 input means 19 input means 20 main shaft of loom 21 motor drive unit 22 encoder

Claims (2)

[Claims] 1. A movable member provided for each of a plurality of wefts is selectively operated to reciprocate a weft thread passed through a thread guide of a movable member between a standby position and a weft insertion position at which a rapier can catch a thread. In a weft selecting device of a rapier loom that moves and captures and inserts a weft at a weft insertion position by a rapier, the weft is generated in a plurality of coils and coils arranged on a stator along a reciprocating movement direction of each of the movable members. A linear motor having a mover that reciprocates the movable member by the traveling magnetic field, and a linear motor corresponding to the weft inserted into the weft is selected based on a selection pattern of the weft, and the selected linear motor is moved to the main shaft of the loom. A weft selecting device for a rapier loom, comprising: a control device that drives in a reciprocating direction in synchronization with rotation. 2. A movable member provided for each of a plurality of wefts is selectively operated to reciprocate a weft thread passed through a thread guide of the movable member between a standby position and a weft insertion position at which a rapier can catch a thread. In a weft selecting device of a rapier loom that moves and captures and fills a weft at a weft insertion position by a rapier, the weft is generated in a plurality of coils and coils arranged on a stator along a reciprocating movement direction of each of the movable members. A linear motor having a mover that reciprocates the movable member by a traveling magnetic field, a sensor that detects a standby position and a weft insertion position of the mover to generate a position signal, and a weft based on a weft selection pattern. Select the linear motor corresponding to the weft to be inserted, and synchronize the selected linear motor with the rotation angle of the main shaft of the weaving machine. Weft selecting device rapier loom, characterized a control device for driving the reciprocating direction, in that it consists of a.