JPH0320502B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an automatic weft insertion position regulating device in a loom, and in particular to a weft inserting automatic position regulating device for a loom. The weft yarn from a long winding material is passed through a certain thread line, the yarn end is made to stand by at a predetermined place, it is gripped by a gripper of a gripper shuttle or a rapier, and the weft is inserted, and the inserted weft yarn is placed at a predetermined place. It is used to weave a fabric that expresses a pattern by the accumulation of adjacent weft threads and pattern elements of the weft threads on the fabric using a sequential drawing technique, by repeatedly inserting the weft with the specification of cutting with mechanical force-driven scissors. This invention relates to an automatic weft insertion position regulating device for a loom.

Conventional technology and its problems Weaving machines that reveal patterns using a sequential drawing technique by inserting weft threads with pattern-constituting elements using this method are conventionally known. Although the productivity is somewhat lower than that of a normal power loom, it is a typical method of weaving patterns using the sequential drawing technique, in which a pattern is applied to the surface of a base sheet such as Japanese paper, and the cut foil material is slit into many narrow strips. By inserting wefts made of cut foil (synonymous with foil yarn), which is called Hikihaku by those skilled in the art, in the required order, we can create a pattern that is originally expressed on the above-mentioned original fabric. Compared to the pattern weaving method, which reproduces the original pattern on the fabric, the weft insertion cycle is superior and high productivity can be achieved.

However, in pattern weaving using the above-mentioned sequential drawing technique, if the weft yarns are not inserted in positions with substantially no deviation in the weft direction of the fabric, the pattern will be distorted, and the pattern constituent elements of the adjacent weft yarns and weft yarns will be distorted. Good pattern weaving by accumulation is not achieved. In addition, weft insertion in a loom is carried out under the guidance of a pinch roller to unwind the weft from a long weft roll. Misalignment often occurs.

Conventionally, in looms used to weave textiles that express patterns using the above-mentioned sequential drawing technique, no means have yet been developed to ensure that the position of weft insertion is automatically and effectively regulated to prevent pattern distortion. It has not been. Incidentally, in the past, the actual situation is that workers manually correct latitude deviations when necessary.

Therefore, the present invention aims to provide a device that can automatically and effectively regulate the position of weft inserting in such weaving to prevent pattern collapse.

Means for Solving the Problems In order to achieve the above object, the automatic weft insertion position regulating device for a loom of the present invention arranges in a fixed position a long winding of weft yarn having pattern constituent elements at required locations. , the weft from the long weft winding passes through a certain thread line and the end of the weft waits at a predetermined location;
The weft is inserted by grasping it with a gripper of a gripper shuttle or a rapier, and the inserted weft is cut at a predetermined point with mechanical power-driven scissors.The weft insertion is repeated to separate the adjacent wefts on the fabric. In a loom used to weave a fabric whose pattern is expressed by an accumulation of pattern elements of the weft threads, a mark sensor detects a position mark made at a predetermined position in each weft insertion range of the weft threads. A synchronization switch is provided at a fixed position facing the thread line on the front side of the shed, and a synchronization switch that operates in synchronization with this when the gripper shuttle or rapier retreats. The loom is set so that the pull-in length is a predetermined length longer or shorter than the steady state, and a gripper opening control means for controlling the opening of the gripper of the gripper shuttle or rapier is built into the loom, and when the gripper shuttle or rapier is retracted, the synchronization switch is activated. Based on the operation of , and the mark sensor detecting that the position mark has reached a fixed point, the gripper release control means causes the gripper to adjust the weft pulling length so that the effective pulling length of the weft by the gripper shuttle or rapier becomes a predetermined length. It is characterized by being opened at a predetermined time depending on whether it is long or short.

Effect In the present invention, a long winding of weft yarn having a pattern forming element at a predetermined portion is arranged at a fixed position, and the weft yarn unwound from the long winding of weft yarn has a constant yarn end. The weft yarn is placed on standby at a predetermined location after passing through the row line, and is gripped by a gripper of a gripper shuttle or rapier to insert the weft.The inserted weft thread is cut at a predetermined location using mechanical force-driven scissors. Insertion and cutting at predetermined locations are repeated, and a pattern appears on the fabric by the accumulation of adjacent weft threads and pattern elements of the weft threads.

In the present invention, during weft insertion, when the grip shuttle or rapier retreats, the synchronization switch is activated and the mark sensor at the fixed position is detected at the fixed point of the position mark on the weft (the position of the mark sensor).
The gripper opening control means operates at a predetermined time based on the arrival, and adjusts the long or short length of the weft thread so that the effective weft thread pull-in length by the gripper shuttle or rapier becomes the predetermined length. Correspondingly, weft insertion is automatically regulated in position in such a way that the gripper of the gripper shuttle or rapier is opened at the correct time. That is, it effectively copes with the weft pulling tension due to changes in temperature and humidity, vibrations of the loom, etc., so that the effective weft pulling length becomes a predetermined length, and the weft position of the weft inserted weft is kept at a predetermined position. In this way, the point at which the gripper shuttle or rapier releases the grip on the thread is correctly regulated at a predetermined time.

Effects of the Invention As described above, according to the present invention, it is possible to overcome the effects of the weft pull-in tension section, the vibration of the loom, etc.
With regard to weft insertion using a grip shuttle or a rapier, it is guaranteed that the effective length of weft insertion and the weft position are accurately regulated, and automatic position regulation of weft insertion can be effectively performed.

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

In the figure, 1 is a long winding of weft yarn having pattern constituent elements at required locations, 2 is a gripper shuttle or rapier in a loom (hereinafter abbreviated as gripper shuttle), and 3 is a gripper of the gripper shuttle, which is the length of the weft yarn. The shakumaki material 1 corresponds to a weave made of so-called drawn foil used in a conventionally known typical pattern weaving method using the sequential drawing technique, which is connected in the length direction in the order of weft insertion. It is sufficient to apply a position mark 4 at a predetermined position in a part corresponding to the selvage of the fabric in one weft insertion range, and the Gritspa shuttle 2 can be used in the same manner as before to move the warp during shedding. It moves back and forth. The position mark 4 may be of any suitable color.

Reference numeral 5 denotes scissors arranged in a fixed position and driven forward by a suitable mechanical force such as by a solenoid (not shown), which, when driven forward, closes a fixed member (not shown) in a fixed position. Shearing action is performed by the scissor ridges coming into contact with the scissors. In addition, scissors 5 in the figure is shown for convenience to make it easier to understand.
Although shown in front view, the installation is in an oriented manner corresponding to a side view with respect to FIG.

The long weft winding 1 is placed at a fixed position on the loom, and the weft 1a is guided by guide rollers 6...
The yarn is fed out through a pinch roller 7, and the end of the yarn is kept waiting at a predetermined location.

Weft 1a unwound from long weft roll 1
A mark sensor 8, such as a color mark sensor, is disposed at a fixed position so as to face the position mark 4 in the yarn line on the front side of the shed, more preferably on the front side of the pinch roller 7. The mark sensor 8 can be a direct reflection photoelectric switch type.

A synchronization switch 9 such as a photoelectric switch that is turned on in synchronization with the retreat of the gripper shuttle 2 is arranged at a position corresponding to when the gripper shuttle 2 has retreated to a certain position from its most advanced position, for example, 10 to 20 mm. The switch 9 is a light shielding rod 23 attached to the operating lever 10 of the gripper shuttle 2.
The light may be turned on by blocking light.

The loom is set so that the weft take-up length by the grip shuttle 2 is a predetermined length longer or shorter than the normal length (in other words, the length corresponding to the distance between the position marks 4 and 4), and the synchronous switch 9 is activated in the loom. A gripper opening control means 11 is provided for opening the gripper 3 in the gripper shuttle 2 at a fixed position based on the detection of a position mark by the mark sensor 8, that is, fixed point detection. The gripper opening control means 11 is a stopper 1 formed by a lock lever that is always tended by a spring 14 to be displaced to a position where it restrains a fixed plate 13 at the rear end of an off-road 12 that releases the gripper 3 of the gripper shuttle 2.
5. The stopper 15' placed in a fixed position, the connecting rod 17 pushed to the right in FIG. ), the fixing plate 13 is attached to the rod 1.
7, a solenoid (not shown) that drives the lever to the left in FIG. It is sufficient to apply a lever that does not rotate and includes the lever 19 drive actuator 20 as a component. The operating body 20 is installed on the grip shuttle 2,
The system of stops 15 and levers 19 is placed in position. 21 is a roller which is a pushing body for lever 19 of actuator 20, and 22 is a roller pushed down by roller 21.

When the gripper shuttle 2 takes up the weft by a predetermined length longer than the normal length, the gripper opening control means 11 excites the solenoid of the rod 17 to engage the stopper 15 with the fixing plate 13 when the gripper shuttle 2 retreats. The gripper 3 may be released through the off-road 12 by restraining the fixing plate 13, and when the length is set shorter than the normal one and the length for weft take-up is set shorter, the stopper 15 does not restrain the fixing plate 13. The fixing plate 13 may be moved back by the spring 16 to a position where it contacts the stopper 15' at the fixed position.

In the illustrated apparatus according to the present invention, the weft yarn 1a, which has been unwound from the long weft yarn winding 1 and is waiting with its yarn end at a predetermined position, advances toward the left in FIG. 1 together with the gripper shuttle 2. Then, the yarn tip is gripped by the gripper 3 operating in a conventional manner at a fixed position, and the yarn is inserted by retreating the gripper shuttle 2. As a result of the weft insertion, the weft yarn 1a corresponding to the next weft insertion is let out and stands by. The inserted weft yarn is then cut at a predetermined location by advancing the scissors 5 and shearing the scissors 5 at the forward position. After the cutting operation is completed, the scissors 5 are returned to their original positions.

During weft insertion, if the weft take-up length by the gripper shuttle 2 is set to be longer than normal by a predetermined length, the synchronization switch 9 is operated in synchronization with this when the gripper shuttle 2 retreats, and the mark sensor 8 is set to the position. When the mark 4, that is, a fixed point is detected, the fixing plate 13 engages and restrains the stopper 15 of the gripper release control means 11 at the fixed point based on this, thereby opening the gripper 3 at a fixed position and releasing the weft. . This gripper release control adjusts the effective weft take-up length by the gripper shuttle 2, and with this adjustment, the relative position of the position mark 4 with respect to the mark sensor 8 is also adjusted to a fixed position. During this weft insertion, the roller 21 on the actuating body 20 passes over the roller 22 on the lever 19 from the left to the right in FIG. 2 accompanied by the gripper shuttle 2;
The stopper 15 holds the fixed plate 13 in a restrained state because it rotates clockwise in FIG. After weft insertion, Rod 1
Solenoid 7 is demagnetized. Next, when the gripper shuttle 2 moves forward, the lever 19 is pushed down by the roller 21 on the operating body 20 via the roller 22, and the stopper 15 is pushed down through the link 18.
Pull down to remove it from the fixed plate 13. The fixed plate 13, now free, is pushed by the spring 16, moves to the right in FIG. 2 together with the rods 17 and 12, and rides on the hook 15a of the stopper 15.

When the weft take-up length by the grip shuttle 2 is set to be a predetermined length shorter than the normal one, the gripper is moved at the fixed point based on the operation of the synchronization switch 9 and the fixed point detection by the mark sensor 8 according to a predetermined setting. The stopper 15 of the opening control means 11 comes off from the fixing plate 13, and the fixing plate 13
is the gripper release control means 1 together with the off-road 12.
The gripper 3 is moved back by the spring 16 until it hits the stopper 15' at the fixed position of the gripper 1, and the gripper 3 is released at the position corresponding to the latter stopper 15', thereby adjusting the effective length of the weft yarn taken up by the gripper shuttle 2. , the relative position of the position mark 4 with respect to the mark sensor 8 is also adjusted.

Thereafter, the gripper opening control means 11 similarly regulates the weft effective take-up length to a predetermined length.
The weft insertion position is regulated.

[Brief explanation of the drawing]

Fig. 1 is a partially omitted front view showing an embodiment of the present invention, Fig. 2 is a detailed view of the gripper opening control system, and Fig. 3 is a synchronization switch system for detecting when the gripper shuttle reaches the home position. It is a front view. 1 is a long weft winding, 2 is a grippa shuttle,
3 is the gripper, 4 is the weft position mark, 5 is the scissors,
6 is a guide roller, 8 is a mark sensor, 9 is a synchronization switch, 10 is a gripper shuttle operating lever, 11 is a gripper opening control means, 12 is a gripper off-road, 13 is a fixing plate, 15, 15' is a stopper, and 17 is a connecting device. Rod, 18
1 is a link, 19 is a lever, and 20 is an operating body for driving the same lever.

Claims (1)

[Claims] 1. A long winding of weft having pattern constituent elements at a predetermined location is arranged in a fixed position, and the weft from the long winding of weft is passed through a certain thread line and the end of the weft is placed in a predetermined position. The weft is placed on standby, gripped with a gripper of a gripper shuttle or rapier, and weft insertion is repeated under the specifications of cutting the inserted weft yarn at a predetermined location with mechanical force-driven scissors.
In a loom used to weave a fabric that expresses a pattern by the accumulation of adjacent weft threads and pattern constituent elements of the weft threads on the fabric, a position mark made at a predetermined position in each weft insertion range of the above-mentioned weft threads is detected. A mark sensor is arranged at a fixed position facing the thread running line on the front side of the weft shed, and a synchronization switch which operates in synchronization with this when the gripper shuttle or rapier retreats is arranged at a fixed position. The loom is set so that the length of the weft drawn in by the gripper shuttle or rapier is a predetermined length longer or shorter than the steady state, and a gripper opening control means for controlling the opening of the gripper of the gripper shuttle or rapier is built into the loom, When the gripper is retreating, based on the operation of the synchronization switch and the detection that the position mark has reached a fixed point by the mark sensor, the gripper is controlled by the gripper release control means so that the effective weft pulling length by the gripper shuttle or rapier becomes a predetermined length. An automatic weft insertion position regulating device for a loom, characterized in that the device is configured to open at a predetermined time depending on whether the weft is drawn in long or short.