JPH03180546A - Device for measuring length of weft and storing weft in loom and device for controlling rotation yarn guide thereof - Google Patents

Abstract

PURPOSE:To carry out threading to a balloon breaker with one movement through a rotation yarn guide of weft by correcting and controlling stop position of the rotating yarn guide when threading direction is sent after completion of action for removing yarn left by occurrence of weft breakage and then operating a threading nozzle. CONSTITUTION:When yarn breakage occurs between a yarn feed body Y and device for measuring length of weft and storing the weft, a loom is automatically stopped and removal of residual yarn on a drum 11 is carried out and then threading direction is sent. In this time, stop position of rotation yarn guide 14 detected by encoder EN is corrected and controlled so as to be out of banned area set corresponding to ar ranged position of fixing pin 12. Then the threading nozzle 16 is operated and weft Y is blown into the inside of the above-mentioned rotation yarn guide 14 and simultane ously carried along extension line of center line LC of top of the guide 14 and subjected to threading into a balloon breaker 15 with one movement. A suction device 17 ar ranged in front of the breaker 15 is previously operated and the above-mentioned weft Y subjected to threading is sucked and restricted and rotation yarn guide 14 is rotated to wind the weft Y on a drum 11.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a weft length measuring and storage device for a loom with an automatic threading function used in a shuttleless loom, and a rotating yarn guide control device therefor.

Conventional technology Shuttleless looms such as jet looms and rapier looms have
Various types of weft length measurement and storage devices are used, and among them, a drum-type weft length measurement and storage device is widely adopted.

A drum-type weft length measuring and storage device (hereinafter simply referred to as a length measuring device) generally includes a drum, a rotating yarn guide for winding the weft around the drum, and a rotating yarn guide that moves forward and backward with respect to the circumferential surface of the drum. and a locking pin that controls the unwinding timing of the weft.

Since the rotating yarn guide is hollow, it is necessary to pull the weft through the rotating yarn guide at the beginning of operation or when the yarn breaks on the upstream side of the length measuring device, and this is automatically done. A length measuring device with a so-called automatic threading function is already known (for example, Japanese Patent Laid-Open No. 61-64673).

The automatic threading function has a threading nozzle installed at the rear of the rotating yarn guide.The tip of the weft yarn pulled out from the yarn feeder is suctioned by air and conveyed to the tip of the rotating yarn guide. This is a function that automatically pulls the weft thread through. Therefore, by mechanically gripping the leading end of the weft yarn that has been pulled through in this way and rotating the rotating yarn guide, the weft yarn can be easily wound onto the drum. The threading means can perform a threading operation to the main nozzle and start a weaving operation of the loom.

Problem to be Solved by the Invention According to the prior art, when performing an automatic threading operation, the rotating yarn guide stops in order to ensure that the threaded weft is gripped by other members. The drawback is that the position must be precisely controlled, and the control device for the rotating yarn guide is complicated.

In addition, since the weft yarn is only conveyed to the tip of the rotating yarn guide, when a balloon breaker is attached to the front side of the drum, another pulling means is prepared in order to pull the weft yarn through the balloon breaker. There was also the drawback of having to do so.

SUMMARY OF THE INVENTION In view of the shortcomings of the prior art, an object of the present invention is to provide a rotating yarn guide with a guiding portion that directs the air flow within the rotating yarn guide in a predetermined direction.
Weft thread measurement on a loom without the need for any separate threading means for threading through the balloon breaker by ensuring that the drawn weft thread is conveyed up to the front opening of the rune breaker. It is an object of the present invention to provide a storage device and a rotating yarn guide control device thereof whose overall configuration is significantly simplified.

Means for Solving the Problems The first invention according to this application to achieve the above object has a configuration including a drum, a rotating yarn guide for winding the weft around the drum, and a rotating yarn guide that moves forward and backward toward the circumference of the drum and winds the weft around the drum. It is equipped with a locking pin that controls the unwinding timing, a balloon breaker placed in front of the drum, a threading nozzle that generates an air flow in the threading direction within the rotating yarn guide, and a threading nozzle formed at the tip of the rotating yarn guide. The gist thereof is to have a threading means comprising a guide portion for directing the air flow within the rotating yarn guide between the drum and the balloon breaker.

Note that a thread suction device may be provided in front of the balloon breaker.

The configuration of the second invention includes a position detection means for detecting the stop position of the rotating yarn guide, and a comparison means for comparing the prohibited area set corresponding to the arrangement position of the locking pin and the stop position of the rotating yarn guide. The gist thereof is to drive the rotating yarn guide in a corrective manner so that the stopping position of the rotating yarn guide is outside the prohibited area when there is a threading command.

According to the configuration of the first invention, the weft yarn can be automatically conveyed from the entrance side of the rotating yarn guide to the front opening of the balloon breaker by the air flow of the threading means. No special threading means are required for drawing the weft thread through the balloon breaker. The guide section can be configured by bending its tip inward so that the center line of the rotating yarn guide is directed between the drum and the rear opening of the balloon breaker, or by controlling the air flow within the rotating yarn guide. It is formed by providing a baffle member at the tip of the rotating yarn guide to direct it between the drum and the rear opening of the balloon breaker. Furthermore, the threading operation can be performed at any stop position of the rotating yarn guide other than the position where the locking pin is disposed.

The weft yarn that has reached the front of the balloon breaker may be held by hand, but if a yarn suction device is installed there, the weft yarn can be easily restrained by operating it, and the weft yarn can be easily wrapped around the drum. operation can be realized. In addition, the yarn suction device at this time can be moved forward and backward on the front side of the balloon breaker between a forward position where it blocks the running path of the weft yarn during normal weft insertion, and a backward position where it retreats from this running path. In the forward position, the balloon breaker advances to the front of the balloon breaker and can securely restrain the tip of the weft yarn, while in the backward position, normal weft insertion can be allowed.

According to the configuration of the second invention, the rotating yarn guide is corrected and driven each time it stops within the prohibited area when there is a threading command, so its final stopping position is outside the prohibited area; When threading the rotating yarn guide, it is possible to reliably prevent the weft blown out from the tip of the rotating yarn guide from interfering with the locking pin.

Example Examples will be described below with reference to the drawings.

The main components of the length measuring device are a drum 11, a locking pin 12, a main body 13 incorporating a rotating yarn guide 14, and a balloon breaker 15 (FIG. 1).

The drum 11 is a stationary drum, and the weft yarn Y can be wound and stored on its circumferential surface. The locking pin 12 is
The main nozzle MN, which advances and retreats toward the circumferential surface of the drum 11 and is disposed in front of the length measuring device, unwinds a predetermined length of weft Y from the drum 11 at a predetermined time, and inserts the weft into a warp opening (not shown). You can put it in.

The main body 13 is attached to the drum 1 so as to be coaxial with the drum 11.
The rotary yarn guide 14, the motor M that rotationally drives the rotary yarn guide 14, and the encoder EN that detects the stop position of the rotary yarn guide 14 are incorporated therein. (Figures 1 and 2). Further, a threading nozzle 1 is provided at the rear end of the main body 13.
6 is attached.

The rotating yarn guide 14 is formed by connecting a hollow rotating part 14a, an intermediate part 14b, and a tip part 14c, and is rotatably supported on a fixed frame 13a of the main body 13 via bearings 13b, 13b. . Further, the tip end 14C of the rotating yarn guide 14 can wind the weft yarn Y drawn out from the tip end 14c around the drum 11 by drawing a rotation trajectory larger than the maximum diameter of the drum 11 from the rear of the drum 11. (double-dashed line in Figures 1 and 2). Further, the center line LC of the tip portion 14c is the same as that of the rear opening 15b of the drum 11 and the balloon breaker 15.
Preferably, the inner side is formed so that it does not interfere with the outer periphery of the drum 11 and can extend to the front opening 15a of the balloon breaker 15 disposed in front of the drum 11. Assume that it is bent.

The threading nozzle 16 is attached to the fixed frame 13a via a bracket 16a, and consists of an outer cylinder 16b and an inner cylinder 16c (FIG. 2). The inner cylinder 16c has an air guide 16c1 and an appropriate number of nozzle holes 16c2, 16c2.
. . , and an air flow in the direction of arrow A in FIG. 2 can be created inside the threading nozzle 16 by pressurized air from the air introduction hole 16b1 formed in the outer cylinder 16b. The threading nozzle 16 is communicated with the rotating portion 14a of the rotating yarn guide 14 via an auxiliary pipe 16d.

The balloon breaker 15 is a hollow tapered cylinder arranged in front of the drum 11, and further in front of it, a yarn suction device 17 and a main nozzle MN are arranged (FIG. 1).
. The yarn suction device 17 consists of a suction cup 17a and a suction device 17b, and the suction cup 17a is located in a forward position (in front of the front opening 15a of the balloon breaker 15) where it blocks the travel path of the weft Y to the main nozzle MN. 1), and the retracted position (solid line in the same figure).

A rotating yarn guide control device (hereinafter simply referred to as a control device) 21 is attached to the length measuring device (FIGS. 1 and 3).

The control device 21 includes a setter 21a% 21b% comparator 21c.
Each output of the setters 21a and 21b is input to a comparator 21c. One output of the comparator 21c is pulled out to the outside as the threading start signal S2 and is connected to the reset terminal R of the flip-flop 21d, and the other output is connected to the AND gate 21e and the power amplifier 21.
It is connected to the motor M of the length measuring device via f. In addition, the output of the encoder EN of the length measuring device is output from the comparator 21C.
has been entered.

Threading command 51 (1) supplied from outside the control device 21
It is input to the set terminal S of the flip-flop 21d, and the output terminal Q of the flip-flop 21d is input to the AND gate 2.
1e. However, the threading command S1 is issued, for example, when the weft yarn Y is broken between the yarn feeder Yl, which is the supply source of the weft yarn Y, and the length measuring device, or when the threading instruction S1 is issued from the drum 11 of the length measuring device. It is assumed that when the unwound weft Y causes a yarn breakage between the weft yarn Y and the main nozzle MN, the weft yarn Y is outputted based on a detection signal from a yarn breakage sensor (not shown).

A threading start signal S2 from the control device 21 is input to an on-off valve V interposed between the pressure air source AC and the threading nozzle 16. Furthermore, a weft insertion signal S3 from a weft insertion control device (not shown) is input to the locking pin 12.

When normal weft insertion operation is performed, the yarn feeder Y1
The weft yarn Y is drawn through the threading nozzle 16 of the length measuring device and the rotating yarn guide 14, and as the rotating yarn guide 14 rotates, the weft yarn Y is wound and stored on the circumferential surface of the drum 11.

On the other hand, the locking pin 12 is driven to move away from the circumferential surface of the drum 11 by the weft insertion signal S8 at a predetermined weft insertion time. can be executed.

When a predetermined length of weft yarn Y is unwound from the drum 11, the weft insertion signal S3 is reset and the weft insertion operation is completed. Note that at this time, the yarn suction device 17 places the suction cup 17a in the retracted position, and the rotating yarn guide 14
is controlled by a control circuit (not shown) separate from the control device 21,
By driving and controlling the motor M, it is assumed that a predetermined amount of the weft yarn Y is always wound and stored on the circumferential surface of the drum 11.

When the weft yarn Y breaks between the yarn feeder yi and the length measuring device, the loom automatically stops in response to a detection signal from the yarn breakage sensor, and the rotating yarn guide 1 of the length measuring device stops.
4 stops rotating. Then, after the operation for removing the remaining yarn remaining on the drum 11 or the like is completed, a threading command S1 is generated, and the flip-flop 21d of the control device 21 is set.

Therefore, now the stopping position X of the rotating yarn guide 14 is
When expressed as an angle around the drum 11 (Fig. 4),
The angle range corresponding to the locking pin 12 is set as a prohibited area, and its lower limit x=a and upper limit X=b are set by setting devices 21a and 21b.
Set to . Further, the encoder EN outputs the stop position X, and the comparator 21c sets the output on the AND gate 21e side to a high level when b≧X≧a, x
1) If the output on the flip-flop 21d side is set to a high level, the AND gate 21e determines that the stop position X of the rotating yarn guide 14 is within the prohibited area when there is a threading command Sl. Under this condition, the motor M can be driven at a low speed in a corrective manner. When the motor M is driven for correction and the stop position X of the rotating yarn guide 14 is outside the prohibited area, the flip-flop 21d is reset and a threading start signal S2 is output.

When the threading start signal S2 is output, the on-off valve V opens and air is introduced into the threading nozzle 16 from the pressure air source AC. Therefore, by appropriate means, the weft yarn Y from the yarn supplying body Yl is
If the yarn end of Y is brought close to the rear of the threading nozzle 16, the weft Y
is sucked by the air flow inside the threader/darle 16, and can be threaded all the way to the tip 14c of the rotating yarn guide 14 at once. At this time, the stopping position X of the rotating yarn guide 14 is outside the prohibited area, and the tip 14c is bent toward the front opening 15a of the balloon breaker 15. 14c
The weft yarn Y blown out with air from the tip part 14c
Along the extension line D of the center line LC, the balloon breaker 15
The balloon can be transported as it is to the front opening 15a of the balloon breaker 15, and can be pulled through the balloon breaker 15.

Before operating the threading nozzle 16, if the suction cup 17a of the thread suction device F is moved to the forward position and the suction device 17b is operated, the tip of the weft Y threaded through the balloon breaker 15 will be removed. Since the weft yarn Y can be suction-restricted by the suction device 17, the weft yarn Y can be wound around the drum 11 by rotating the rotating yarn guide 14 in this state. Therefore, from now on, by an appropriate method, the weft yarn Y being sucked by the suction device 17 is
By cutting the thread into an appropriate length and threading it through the main nozzle MN, the loom can be restarted.

When a yarn breakage corresponding to a so-called restraint breakage occurs between the drum 11 and the main nozzle MN, the weft yarn Y is generally wrapped around the rear side of the locking pin 12 and remains on the drum 11. There is.

At this time, in the same manner as described above, the rotating yarn guide 14
When the yarn Y is stopped outside the prohibited area and the threading nozzle 16 is activated, the weft yarn Y is extended in a loop shape between the rotating yarn guide 14 and the drum 11, and its bent portion is folded back to form a balloon. It is passed through the breaker 15. Therefore, by activating the suction device 17 and driving the locking pin 12 to the unwinding position, the weft yarn Y on the drum ll will be moved to the drum 11.
The yarn is unwound and the entire amount is suctioned by the suction device 17 and discarded. Thereafter, the locking pin 12 is returned to the locking position and winding is performed using the rotating yarn guide 14. Thereafter, the loom may be restarted in the same manner after the main nozzle MN is drawn through.

In the above description, the suction device 17 can be omitted. At that time, the tip or bent portion of the weft yarn Y that has been pulled through to the front opening 15a of the balloon breaker 15 is restrained with fingers, and the rotating yarn guide 14
By rotating , winding around the drum 11 is possible. Moreover, the suction device 17 can be of any type. For example, the shape of the suction cup 17a may be changed to a nozzle shape as long as the suction cup 17a can effectively suction and restrain the weft yarn Y drawn to the front opening 15a of the balloon breaker (5). Rather than being able to move back and forth between the position and the retreated position, it may be of a fixed type.

Furthermore, since the control device 21 is used when threading the rotating yarn guide 14, it goes without saying that it can be applied as is to a length measuring device that does not have a balloon breaker 15. The nozzle 16 can also be replaced by any type of automatic threading means as long as it can thread the yarn up to the tip of the rotating yarn guide 14 using air.

The encoder EN of the length measuring device of the other embodiment detects the stop position X of the rotating yarn guide 14, and the stop position X is expressed as an angle around the drum 11. It is also possible to reuse the pulse generator for rotation detection (FIG. 5). Now, in the same figure, the symbol H
If it is assumed that n high-level pulses are generated at equal intervals for one rotation of the rotating yarn guide 14 as shown in the figure, the width of one pulse corresponds to 360/(2n) degrees. Therefore, if the angular width d=ba-a (degrees) in the prohibited area is d≦360/(2n), the comparator 21c of the control device 21 simply detects that the input signal from the pulse generator is high. It is sufficient to open the AND/G 21e when the level is high, and reset the flip-flop 21d when the low level (corresponds to the numbers in FIG. 5). however,
At this time, the comparator 21c must compare the stop position X of the rotating yarn guide 14 with the prohibited area.
A suitable gate circuit is interposed between the pulse generator and the comparator 21c, and the output of the pulse generator when the rotating yarn guide 14 is stopped is input to the comparator 21c.

Note that the above-described operation of the control device 21 can be easily realized by software of a microcomputer (FIG. 6). That is, the control device 21 includes position detection means (encoder EN in FIG. 3, block (1) in FIG. 6) for detecting the stop position X of the rotating yarn guide 14.
Comparison means (comparator 21c in FIG. 3, block in FIG. 6) for comparing the stop position (2)) and a rotating yarn guide 14.
It is sufficient if the rotating yarn guide 14 can be corrected and driven via the motor M so that the stop position X is outside the prohibited area.

A suitable rectifying member 14'd may be attached to the tip end 14c of the rotating yarn guide 14 (FIGS. 7 and 8). The rectifying member 14d is configured such that the weft yarn Y drawn through the rotating yarn guide 14 is directed between the drum 11 and the rear opening 15b of the balloon breaker 15, preferably through the balloon breaker 15, toward the front opening 15a thereof. Since the air blowing direction LCI can be appropriately regulated, there is no need to increase the bending angle of the tip 14c, and therefore the weft yarn Y can be pulled through the rotating yarn guide 14 and the weft yarn Y can be wrapped around the drum 11. Both can be achieved smoothly.

That is, in this invention, the rotating yarn guide 14
The guide part for directing the air flow in a predetermined direction is
It can be formed by appropriately bending the tip of the rotating yarn guide 14 or by attaching a flow regulating member 14d to the tip of the rotating yarn guide 14, and this guiding portion and the threading nozzle 16 are connected to the threading nozzle 16. The guide 14 and the rune breaker 15 together form a threading means for realizing a threading operation.

As described in detail, according to the first invention of this application,
By allowing the air of the threading means to transport the weft yarn that has been pulled through the rotating yarn guide as it is to the front opening of the rune breaker, the weft yarn can be pulled through against the rotating yarn guide and the rune breaker force. Since the work can be carried out continuously in one motion, there is no need for any special means for threading the thread through the inside of the balloon breaker, and the operation of restarting the loom can therefore be made much smoother. It has excellent effects.

In addition, even if the weft yarn remains on the drum, the weft yarn can be stretched into a loop and pulled through the balloon breaker, so in the case of so-called restraint breakage, the weft yarn remaining on the drum cannot be removed. In addition, since the rotating yarn guide itself has a guiding part that directs the air flow in the rotating yarn guide in a predetermined direction, The stopping position may be any position that does not interfere with the locking pin, and therefore the rotating yarn guide is stopped.

There is also the practical effect that correct position control is extremely simple.

According to the second invention, with an extremely simple configuration, the stopping position of the rotating yarn guide can be reliably set outside the prohibited area, and therefore, the subsequent threading operation can be carried out smoothly.

[Brief explanation of drawings]

Figures 1 to 4 show examples, where Figure 1 is an explanatory diagram of the overall configuration concept, Figure 2 is a detailed explanatory diagram of main parts, Figure 3 is an electrical system diagram, and Figure 4 is an explanatory diagram of operation. . FIG. 5 is a diagram corresponding to FIG. 4 showing another embodiment. FIG. 6 is a flowchart showing another embodiment. FIG. 7 shows yet another embodiment, in which FIG. 7(A) is an explanatory diagram of the main part configuration, and FIG. 7(B) is a front view of FIG. 7(A). FIG. 8 shows another embodiment, and FIGS. 8A and 8B are views corresponding to FIGS. 7A and 7B, respectively. Y... Weft Sl... Threading command X... Stop position K... Prohibited area 11... Drum 12... Locking pin 14... Rotating yarn guide 15... Balloon breaker 15a ...Front opening 16...Threading nozzle 17...Suction device

Claims (1)

[Claims] 1) A drum, a rotating yarn guide for winding a weft around the drum, a locking pin that moves forward and backward toward the circumferential surface of the drum to control the unwinding timing of the weft, and a locking pin located in front of the drum. A weft length measurement and storage device for a loom, comprising a balloon breaker arranged therein, a threading nozzle that generates an air flow in the threading direction within the rotating yarn guide, and a threading nozzle formed at the tip of the rotating yarn guide. A weft length measurement and storage device for a loom, characterized in that the weft length measuring and storage device for a loom has a threading means comprising a guiding portion that directs an air flow within the rotating yarn guide between the drum and the balloon breaker. 2) The weft yarn length measurement and storage device for a loom according to claim 1, characterized in that a yarn suction device is disposed in front of the balloon breaker. 3) A position detection means for detecting the stop position of the rotating yarn guide, and a comparison means for comparing the prohibited area set corresponding to the arrangement position of the locking pin and the stop position of the rotating yarn guide, The weft length measuring and storage device for a loom according to claim 1, wherein when there is a command, the rotating yarn guide is corrected and driven so that the stopping position of the rotating yarn guide is outside the prohibited area. Rotating yarn guide control device.