JPS59199841A - Shuttle driving method in loom - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a driving method for beating a reed in a loom.

BACKGROUND OF THE INVENTION In general, beating drive methods for looms can be roughly divided into crank mechanism methods and cam mechanism methods. There are two types of crank mechanism systems: a harmonic type and a multi-link type.Although the harmonic type is a simple mechanism, the beating motion is a simple harmonic motion, so there is no rest time when inserting the weft. For example, in towel looms and the like, it is necessary to change the beating point due to the pile type, but this method has the disadvantage that the heating point of the reed cannot be easily changed and the mechanism is complicated. In addition, the multi-node link type has a shorter sleigh sword than the harmonic type, and has the advantage that the reed can stand at an angle when it is at rest (this is not a true stationary state, but a pseudo one) during weft insertion. On the other hand, it is a complicated mechanism with a large number of parts and requires advanced technology in its construction.Furthermore, like the harmonic type, it has the disadvantage that the heating point of the reed cannot be changed.

On the other hand, with the cam mechanism method, although the shape of the cam allows the reed to truly stand still during weft insertion, the mechanism is complex and requires advanced technology to construct, and it also requires changing the beating point of the reed. The disadvantage is that it cannot be done.

Furthermore, these conventional beating methods follow a path of converting rotational motion into swinging motion, which is not preferable from the viewpoint of energy efficiency.

Purpose The present invention has been made in consideration of the above facts,
The purpose is to provide a simple mechanism with a small number of parts, and it is possible to freely change the static angle, displacement amount, beating speed, etc. in the beating movement, and also to change the position of the loom required for towel looms. It is an object of the present invention to provide a reed beating drive method for a loom that can be easily handled electrically without mechanical countermeasures.

EXAMPLE Below, an example in which the present invention is embodied in a fluid injection type loom will be explained based on FIGS. A sleigh sword 3 supporting the is fixedly attached to a mounting arm 4 in a tightening relationship. Reference numeral 5 designates a reed which is installed upright on the slay 2, and 6 also designates a weft guide piece.

A movable element 7 made of a non-magnetic material such as a copper plate or aluminum is attached to the tip of the mounting arm 4, and a plurality of teeth and grooves are provided near the swing locus of the movable element 7 around the locking shaft 1. An arc-shaped stator 8 is provided, which is formed by stacking punched electric iron plates (for example, silicon plates), and a plurality of coils 9 are wound around the matching grooves. That is, a linear induction motor M is constituted by the movable element 7 and the stator 8 around which the coil 9 is wound.

In this embodiment, at least a pair of these linear induction motor mechanisms are provided on both sides of the machine base. However, this may be provided at only one location in the middle heat of the machine, or may be provided at multiple locations.

Therefore, the swinging movement of the reed 5 is controlled by controlling the advancing magnetic field of the stator 8 in the linear induction motor M.

Near one of the stators 8, first and second reflective sensors consisting of a light emitting diode and a phototransistor are arranged, and the first sensor 10 on the upper side detects passage of the upper edge of the tip of the mounting arm 4. However, the second sensor 11 on the lower side detects passage of the lower edge of the tip. Both sensors 10.1
1 is 0FFL when the front end is blocked by the tip of the mounting arm 4, and is turned ON when it is not blocked by the tip.

The first sensor 10 is a sensor for stopping the mounting arm 4 at the upper movement stop position, that is, in the opening formed by the warp yarns Y, the weft guide piece 6 is stopped at the most retracted position (the right side in FIG. 1 is the rear side of the machine). It is. This mounting position is provided slightly below both edges of the distal end of the mounting arm 4 in the upward motion stop position, and the first sensor 10
This position takes into account the overrun from the time when the upward movement of the arm 4 is detected until the arm 4 stops.

The second sensor 11 is a sensor for stopping the lower movement of the mounting arm 4, that is, the reed 5 at the most advanced position shown by the chain line in FIG. This mounting position is located slightly above the lower edge of the distal end of the mounting arm 4 which is in the downward motion stop position, and from the time when the second sensor 11 detects the downward movement of the mounting arm 4, the arm 4 is This position takes into account the overrun before stopping.

Next, a pair of linear induction motors M configured as described above
An electric circuit for driving and controlling the reed 5 to swing the reed 5 will be explained based on FIG. 2.

The control circuit 12 receives O from the first and second sensors 10.11.
An FF signal is input, and in response to this input signal, arithmetic processing operations are performed to cause the reed 5 to perform a swinging movement. ROM1
3 is a read-only memory in which a control program is stored. The RAM 14 is a readable and rewritable memory, and includes data on the lowering speed of the mounting arm 4 corresponding to the speed when the reed 5 moves forward, and data on the lowering speed of the mounting arm 4 corresponding to the speed when the reed 5 moves backward. The moving speed data and the time for stopping 8125 at the most retracted position (not shown by a solid line in FIG. 1), that is, the resting angle data for stopping the mounting arm 4 at the upward movement stop position, are stored. The control circuit 12 transfers various data from the RAM 14 to the first and second sensors 10,
11, and based on the read data, the motor drive circuit 15. '16, the drive control signal is output. Both motor drive circuits 15.16
The mounting arm 4 is moved up and down by controlling the frequency conversion and polarity conversion of the pair of linear induction motors M based on a drive control signal from the control circuit 12, thereby causing the reed 5 to reciprocate.

Next, the operation of the beating drive mechanism constructed as described above will be explained.

Now, the linear induction motor M is driven by frequency conversion control based on the upward movement speed data of the mounting arm 4, the mounting arm 4 moves upward at a predetermined upward movement speed, and the reed 5 and the weft guide piece 6 move at a predetermined speed. It's retreating. In this state, the warp yarns Y form an opening, and the weft guide piece 6 enters into the opening. Then, when the first sensor 10 detects the mounting arm 4 that has moved upward and turns it off, the control circuit 12
In response to the F signal, the motor M is stopped to stop the mounting arm 4 at the upward movement stop position, and a timer provided in the circumferential circuit 10 is operated. This state is maintained until the end of the rest angle at the stop position. Then, while the weft is at rest, the weft is ejected from a main nozzle (not shown), inserted into the guide hole a of the weft guide piece 6, and the weft insertion is completed.

When the operating time of the timer reaches the data value of the static angle at the upward movement stop position, the control circuit 12 reads the speed data for the downward movement of the mounting arm 4 from the RAM 14, and based on this data, the control circuit 12 reads the speed data for the downward movement of the mounting arm 4. In addition to converting the polarity and reversing the traveling direction of the traveling magnetic field of the stator 8 in the induction motor M, frequency conversion control is performed. As a result, the mounting arm 4 starts to move downward at a predetermined speed from the swing stop position, and the reed 5 and the weft insertion guide piece 6 start moving forward at a predetermined speed. Then, the weft pulled out from the guide hole 6a of the weft guide piece 6 while the reed 5 is moving forward is driven into the front W1 of the woven fabric W, but at approximately the same time as this reed beating, the second sensor 11 is lowered. The moving mounting arm 4 is detected and turned off. Then, in response to this OFF signal, the control circuit 12 simultaneously stops the linear induction motor M to stop the arm 4 at the downward movement stop position.
The speed data for the upward movement of the mounting arm 4 is read again, the polarity of the linear induction motor M is changed based on this data, the traveling magnetic field of the stator 8 in the induction motor M is reversed, and frequency conversion control is performed. .

As a result, the reed 5 immediately begins to retreat at a predetermined speed after the reed beating operation.

Thereafter, the reed 5 performs the same operation as described above and repeats the reed striking and swinging motion.

As is clear from the embodiments described above, in the present invention, the beating swing movement is performed based on the drive control of the linear induction motor M, so the number of parts is reduced compared to the conventional beating drive mechanism using a crank or cam. A significant reduction is possible. Furthermore, the mechanism has a simple structure in which the only sliding and rotating parts are the bearings of the locking shaft 1, and the swinging movement of the reed is performed very smoothly.

Further, in the present invention, by employing a linear induction motor, electric energy can be directly used as the driving force for the swing motion of the reed beating, and therefore, there is an advantage that energy efficiency is very high.

Now, in the embodiment described above, the linear induction motor M is drive-controlled based on the upward movement speed data, the downward movement speed data, and the static angle data stored in the RAM 14, so that the swinging movement of the shingle is reliably performed. By the way, it is naturally necessary to change the weaving conditions depending on the type of woven fabric, but as mentioned above, there are cases where the static angle cannot be secured with conventional equipment, or even if the static angle can be obtained, changing the weaving conditions is almost impossible. Although it was possible, changing the conditions related to the beating motion would require major changes in the mechanism and would be extremely difficult.

However, in the present invention, the conditions of the beating motion can be easily and freely changed depending on the type of woven fabric. For example, when the weave width of the woven fabric is changed, the static angle data stored in the RAM 14 may be changed, and the upward movement and downward movement speed data may be changed in accordance with this change. In this case, of course, it is not limited to the true rest angle, but may also be a pseudo rest angle.

Further, in the above embodiment, Orimae W1. In other words, the beating point of the reed 5 is always constant, but by changing various stored data in the RAM 14, the beating point of the reed 5 can be changed once or every few times of weft insertion. This simplifies the mechanism of the towel loom, which has traditionally been extremely complex mechanically.
This means that the pile length of the towel woven fabric can be changed steplessly during weaving.

When the weaving width of the woven fabric increases, it takes time to insert the weft, making it difficult to speed up weaving. Therefore, for example, in a framed loom, multiple shuttles are used to insert multiple weft yarns at staggered weft insertion timings, and the reed is further divided into multiple parts and the synthesis is synchronized with the weft insertion timing of each weft yarn. A method has been proposed in which the beating operations are performed sequentially. According to this invention, each of the divided combinations can be driven and controlled by a linear induction motor, and the above-mentioned so-called multiple beating (relay beating) can be easily achieved with a simple mechanism.

It should be noted that the present invention is not limited to the above-described embodiment; for example, as shown in FIGS. 3 and 4, a pair of stators 8 may be arranged on both sides of the movable element 7 so as to sandwich it. In this way, the attractive or repulsive forces from the pair of stators 8 are balanced, the gap between the mover 7 and the stator 8 is kept constant, and a reliable non-contact linear induction motor with good stability and durability is achieved. is configured. Further, in this type of linear induction motor, there is a gap in the vertical direction, and since the movable element 7 moves like a fan, there is no risk of fluff accumulating between the movable element 7 and the stator 8. , j, third
As shown in the figure, if a balance part B is provided at the base end of the sleigh sword 3 and the mounting arm 4, no electrical energy is required to keep the reed 5 stationary at its most retracted position, resulting in an energy saving effect.

Further, in the above embodiment, the reed 5 is controlled by the pair of sensors 10.11.
Although the displacement and speed of the reed 5 are controlled, it is also possible to provide another sensor between the two sensors io and '+i to control the acceleration of the reed 5. In this way, the beating swing motion of the reed 5 can be controlled reliably in accordance with the weaving conditions.

Furthermore, in order to prevent the mechanism consisting of the slay 2, slay sword 3, and attachment arm 4 from running out of control and causing damage to the belt, a mechanical stopper may be provided, or a fifth sensor may be used instead of the sensor 0.11 in the above embodiment. ,6
Predetermined control may be performed using the sensor shown in the figure.

In the example shown in FIGS. 5 and 6, arc-shaped first and second magnetic scales 17 and 18, and one magnetic body 19 are fixed to the tip of the mounting arm 4.
Both scales 17 and 18 are magnetic metal pieces 17a and 18.
a are provided at equal intervals. Both metal pieces 17a and 18a are arranged with a slightly shifted relationship from each other. Furthermore, magnetic sensors 2o and 21.22 are installed on the front side of the magnetic scale 17.18 and the magnetic body 19, respectively, near the center of the swing locus of the tip of the mounting arm 4.

The signal obtained by matching the magnetic sensor 22 and the magnetic body 19 serves as a reference signal for the other sensors 20.21. Therefore, for example, when the mounting arm 4 moves upward based on the signal obtained by the magnetic body 19, the magnetic sensors 20, 2
1 is counted by sequentially obtaining signals from the first and second magnetic scales 17 and 18. Then, the count returns to zero when the mounting arm 4 moves downward from the upward movement stop position and the magnetic sensor 22 and the magnetic body 19 match again. The same applies when the mounting arm 4 moves downward. Therefore, since the upward and downward movement speeds of the mounting arm 4 can be known, the speed of the arm 4 can be monitored and adjusted. Further, the direction of movement of the mounting arm 4 can also be detected based on the signals from the first and second magnetic scales 17 and 18, which is useful for preventing malfunctions.

In addition, in the present invention, in addition to the linear induction motor, a linear motor such as a linear DC motor, a linear vibration actuator, a linear pulse motor, or a linear synchronous motor can be used for the beating drive.

Effects As detailed above, since the swinging movement of the present invention is performed using the beam near motor, it is possible to easily deal with changes in various conditions in the beating movement, and
It has excellent effects in that it provides a simple mechanism with a small number of parts, is easy to handle, and can meet recent energy conservation trends.

[Brief explanation of drawings]

Fig. 1 is a side view of essential parts showing an embodiment embodying the present invention, Fig. 2 is an electric block circuit diagram for driving and controlling a linear induction motor, and Fig. 3 is a diagram showing the final locking shaft 1.
, slay sword 3, mounting arm 4, reed 5, mover 7, stator 8, coil 9, sensors 0 and 11, control circuit 12,
ROM 13, RAM 14, linear induction motor M0 Patent applicant: Toyota Industries Corporation, representative
Person Patent Attorney On 1) Hironobu')

Claims (1)

[Scope of Claims] 1. In an AM reed beating device that inserts a weft into a warp opening and performs a reed beating movement after weft insertion, a support member that supports the reed is driven by a linear motor, and the reed beating A method for driving a reed beating in a loom, characterized by imparting motion. 2. The reed in the loom according to claim 1, wherein the support member is composed of a sleigh on which the reed is erected, and a slay sword and a mounting arm that are fixedly attached to the locking shaft in a tightening relationship. Beating drive method. 3. A patent claim in which the linear motor is composed of a movable element provided at the tip of the mounting arm and an arc-shaped stator disposed near the rocking locus of the movable element around the rocking shaft. A beating drive method in a loom according to item 2.