JPS63227832A - Bobbin replacing apparatus - 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 of the Invention The present invention relates to a device for automatically changing a weft feeder in a shuttleless loom.

Prior art Japanese Patent Application Laid-Open No. 48-67546 discloses a method in which a plurality of yarn feeders are installed in an endless yarn feeder stand in a transfer tail state as a weft hopper of a shuttleless loom, and the weft is consumed for a certain yarn feeder. This state is detected by the sensor and indicates that a new yarn supplying body is to be moved to the supply position.

According to such a device, since the yarn supplying body is automatically replaced, it is possible to save labor.

On the other hand, the applicant of the patent has proposed a method of supplying the weft yarn from a new yarn supplying body in a threaded state to a length measuring and storage device when the yarn breaks during weaving, in an invention disclosed in Japanese Patent Application Laid-Open No. 61-47849. This threading method is based on the premise that the weft thread in a transfer tail state exists on the line of motion of the thread guide tube. For this reason, the technology of the weft hopper of the shuttleless loom cannot be adopted as is when the threading method is put into practical use.

Problems of the Invention When the threading method of JP-A-61-47849 was applied to the weft hopper (yarn feeder feeding device) of JP-A-48-67546, the following problems occurred.

First, it is necessary to install the yarn guide device so that the yarn feeding position and the transfer tail between the yarn feeding bodies at the position one pitch before the yarn feeding position are on the line of motion of the yarn guide tube. The position of the opening of the guide and guide tube must be at the center position of each yarn feeder movement.With these conditions satisfied, the yarn guide tube is tilted diagonally downward with respect to the yarn feeder feeding device. The positioning of the thread guide tube is complicated, and the threading operation of the transfer tail using the thread guide tube lacks accuracy.

Secondly, according to the above-mentioned weft hopper, in order to always keep the axis of the yarn feeder pointing toward the yarn guide, the yarn feeder is attached to overhang from the belt by the stay, so when the yarn feeder moves, It is unstable due to vibrations, etc., and yarn breakage is likely to occur when feeding while unwinding.

Purpose of the Invention Therefore, an object of the present invention is to completely and stably automate the threading of the weft yarn and the replacement of the yarn feeder when the weft breaks or the yarn feeder is consumed, while solving the above problems. It is to do so.

Solution to the Invention In view of the above-mentioned object, the present invention provides a method for moving a plurality of yarn feeding bodies in a transfer tail state at predetermined pitch intervals by a winding body of a feeding device, and then moving the winding body in a circular manner at a yarn feeding position. By curving in an arc shape using the arc-shaped guide means, the axes of at least two yarn supplying bodies at the yarn feeding position are always moved toward the yarn guide, and the two yarn feeding bodies are tied at the re-feeding position. The portion is positioned on the line of motion of the thread guide tube by a clamper.

In this way, while the two yarn feeders move to the refeeding position, the axis of each yarn feeder is always directed toward the yarn guide in the drawing direction, so that the weft yarn is not supplied from one yarn feeder. Even when switching to the other yarn feeder, the weft insertion is stable even before and after the weft is replaced because it is not affected by changes due to positional conditions.

Further, at the re-yarn supply body position, the transfer tail portions of the two yarn supply bodies are positioned on the line of motion of the yarn guide tube by the clamper. Therefore, when the weft yarn of the yarn supplying body that is being supplied breaks, the guide tube for the weft yarn automatically moves and becomes in a state where the transfer tail portion can be retracted with the air flow near the clamper. Note that at this time, the transfer tail is automatically cut off by the cutter on the thread breakage side.

As described above, the yarn feeder changing device of the present invention not only automatically replaces a plurality of yarn feeders, but also always regulates the transfer tail in a predetermined position in preparation for supplying a new weft yarn when the yarn breaks. ing.

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a yarn supply body changing device 1 of the present invention. This yarn supply body changing device 1 is composed of a feeding device 2 and a weft yarn guide device 3.

The feeding device 2 holds a plurality of yarn feeding bodies 4 in a transfer tail state and moves them at predetermined pinch intervals. It is assembled by guide means 7. That is, the winding body 6 is endless and is wound between a pair of wheels 8, and is provided with a plurality of holders 9 at each predetermined pitch. The yarn tube 10 is held, for example, frictionally. Note that each holder 9 is attached perpendicularly to the outer surface of the wrapping body 6. One wheel 8 is on the driving side and is driven by a rotary indexing type reducer 11 and a feed motor 12. The weft yarns 5 of these yarn supply bodies 4 are tied to each other at the winding start end 5a and winding end end 5b at adjacent positions, forming a so-called transfer tail state. These weft yarns 5 are frictionally pinched by, for example, spring-type clampers 13, which are provided two for each yarn feeder 4, and are held in tension at a predetermined position.

Further, the guide means 7 is a kind of tensioning device for the wrapping body 6, and is arranged at least two yarn feeding positions P1 and P2.
It has an arcuate shape throughout, and is in contact with the roller on the outside of the wrapping body 6, for example a roller chain. and,
A yarn guide 17 of the weft thread guide device 3 is provided at the center of the circular arc of the guide means 7. As a result, the axes of the two yarn feeding bodies 4 at the yarn feeding position PIP2 are directed toward the center of the yarn guide 17, -&. Further, at a position approximately midway between these yarn feeding positions WPI and P2, between the two clampers 13, a pair of photoelectric first sensors 14, a cutter 15, and the like can be seen in FIGS. 3 and 4. A cylinder 16 is provided for driving this.

On the other hand, the weft thread guide device 3 is for detecting the thread breakage state when the weft element 5 breaks and automatically draws in a new weft thread 5.
is assembled by. That is, the guide tube 20 is located on the line of symmetry between the two yarn supplying bodies 40 at the yarn supplying positions P1 and P2, and the guide tube 20 is located on the line of symmetry between the two yarn supplying bodies 40 at the yarn supplying positions P1 and P2, and
It is slidably fitted into the suction nozzle 19 at its tip, and is movably attached in the direction of the axis of symmetry by an endless belt 22, a pair of pulleys 23, and their drive motor 24. It is being A pair of second sensors 25 are attached to the tip of the suction nozzle 19 for detecting the state of thread breakage.

The feeding device 2 and the weft guide W3 are usually located on a vertical plane and are attached to a side frame 26 on the weft insertion side of the loom using a suitable bracket or the like.

Next, FIG. 2 shows the connection relationship of the control section 27.

This control section 27 is constituted by a microcomputer, and is connected to the first sensor 14, second sensor 25, operation switch, and switch group 29 on the input side, and is connected to the feed motor 12 and the cylinder cylinder on the output side. ,16,
It is connected to the drive circuit 31 , 32 , 33 , 34 of the control valve 28 which operates the drive motor 24 and the suction nozzle 19 . The microcomputer stores an operating program internally, and sequentially operates output-side devices according to input signals.

Effect of the Invention The plurality of yarn supplying bodies 4 are held in advance in a transfer tail state with respect to all the holders 9 by the artist. Of course, all of the weft yarns 5 in the transfer tail state are held by the clamper 13 and stretched approximately straight between them.

First, in the initial state, the control section 27 controls the operation switch group 2.
9, the feed motor 12 and the reducer 11 are driven, and the winding body 6 is rotated, for example, in the direction of the arrow, thereby moving the two yarn feeding bodies to the yarn feeding positions Pi, P2.
guide and stop at that position. At this time, the axes of the yarn feeding bodies 4 at these yarn feeding positions pHP2 are all directed toward the center of the yarn guide 17. In this state, for example, the weft yarn 5 of the yarn feeding body 4 at the yarn feeding position P1 passes through the center hole of the yarn guide 17 and is guided by the suction nozzle 19 from the inside of the true inner tube 20 and the introduction tube 21 to the length measuring storage device 18. ing. During subsequent weaving, the weft yarn 5 is pulled out from the yarn feeder 4 at the yarn feeding position Pl, measured in length by the length measurement and storage device 18, and then inserted at the weft insertion timing.

When the weft yarn 5 of the yarn feeding body 4 at the yarn feeding position P1 is consumed, the weft yarn 5 is in a transfer tail state, so as shown in FIG. 3, the two clampers 13 are removed. A new yarn is automatically pulled out from the yarn supplying body 4 at the yarn supplying position P2. During this time, the first sensor 14 detects the weft thread 5 between the two clampers 13.
However, when the weft thread 5 is removed from the clamper 13, this state is detected and a start signal is given to the IFII controller 27. Therefore, the control unit 27 starts the feed motor 12 and moves the yarn feeder 4 at the yarn feeding position P2 to the next yarn feeding position P1, thereby moving the next yarn feeder 4 to the yarn feeding position P2. Have them wait. Yarn feeder 4
While moving from one yarn feeding position P2 to the other yarn feeding position W, P1, the wrapping body 6 is guided by the arc-shaped guide means 7 (therefore, the axis of the yarn feeding body 4 during movement is , always moves around the center of the yarn guide 17.During this time, the weft thread 5 is continuously drawn out, but there is no major change in the drawing direction.
When replacing the yarn feeder 4, the pull-out resistance of the weft yarn 5 does not suddenly change due to positional changes.

During this time, the artist removes the empty yarn tube 10 and installs a new yarn supplying body 4 in the holder 9 in the state of a transfer tail.

By the way, when the weft yarn 5 breaks during operation of the loom, the weft yarn guide device 3 automatically draws the weft yarn 5 from the next yarn supplying body 4 and guides it to the length measurement storage device 18. That is, if the weft yarn 5 is cut while the weft yarn is being pulled out from the yarn feeder 4 at the yarn feeding position P1, the second sensor 2
5 detects the threadless state and sends a detection signal at that time to the control section 27. Therefore, the control section 27 first stops the loom, starts the drive motor 24, and starts the fourth motor.
As seen in the figure, the suction nozzle 19 and the guide tube 20
is moved through the large hole of the yarn guide 17 to near the clamp fly 3 between the yarn feeding positions PI and P2. Therefore, suction nozzle 1
This will bring you closer to opening number 9. After this, the control section 27
operates the cylinder 16 to cut the weft thread 5 between the two clampers 3 with the cutter 15, and at the same time operates the suction nozzle 19 with the control valve 28 to suck the cut end of the new weft thread 5 together with the air flow. do. When the end of the weft thread 5 enters the suction nozzle 19, its state is confirmed by the second sensor 25, and at that point the control unit 27 reverses the drive motor 24 to remove the suction nozzle. 1'9 and the guide tube 20 are returned to their original positions.During this time, the suction nozzle 19 continues to generate a suction air flow, so that a new weft thread 5 is returned.
is removed from one of the clampers 13, pulled out from a new yarn supplying body 4, and guided by an air flow to a predetermined position in the length measurement storage device 18. In this process, when the weft yarn 5 moves out of the detection position of the first sensor 14, the feeding device 2 receives the activation signal from the control unit 27 and moves the yarn feeding body 4 at the yarn feeding position P2 in the same manner as described above. Automatically move to yarn feeding position P1. After this, the artist removes the release obstruction etc. from the yarn feeder 4 that is in a broken state, and supplies a new yarn feeder 4. Such work is limited by the time limit for replacing the yarn feeder 4. This means that you can do it with a relatively high degree of freedom without being restricted by the rules. After the necessary work such as winding the thread 5 on the length measurement storage device 18 side is completed, the loom is ready to be restarted.

Modifications of the Invention In the above embodiment, two clampers 13 are provided between adjacent yarn supplying bodies 4 as a preferred embodiment.
One of the two can also be omitted.

Further, these cranks 13 may be attached to the holder 9 instead of the winding body 6, and furthermore, they are provided so as to be able to move forward and backward only on the side frame 26 side in the area where the guide tube 20 advances, so that they can advance when the thread breaks. The transfer tail may be restricted to a predetermined position on the line of motion of the weft guide tube 20. Note that when the weft yarn 5 breaks during operation of the loom, the process of feeding a new yarn feeder 4 may be performed after the loom is started.

Effect of the invention The present invention provides the following unique effects.

First, in the process of the yarn supply body moving together with the winding body, the winding body is regulated by the arc-shaped guide body so that its axis always faces the center of the yarn guide, so the weft pulling resistance is reduced. It does not change due to a change in the position of the yarn body, and therefore, the insertion becomes stable when replacing the yarn supply body.

In addition, since the knotted portion of the weft thread is positioned by the clamper on the line of operation of the weft thread guide device at at least two yarn feeding positions, one end of the weft thread is reliably drawn into the guide tube when the thread breaks, and the end of the weft thread is reliably drawn into the inside of the guide tube when the thread breaks. Automatic threading operation is ensured.

In particular, in the present invention, the winding body is regulated at least at the yarn feeding position and the position up to one pitch before the yarn feeding position by an arc-shaped guiding means centered on the yarn guide. It can be provided perpendicular to the feeding direction. As a result, the position of the guide device can be easily set and therefore the transfer tail can be reliably reached, so that the threading operation can be performed stably. Further, since each yarn supplying body can be installed on the winding body without intervening a stay or the like, the movement of the yarn supplying body is performed smoothly, and yarn breaks and the like are less likely to occur. In other words, when considered in an integrated manner, the threading operation can be carried out reliably and stably due to the ease of installation of the guide device. Therefore, even if the yarn feeder moves while being unwound after threading is completed or when the yarn is changed, yarn breakage is unlikely to occur.

[Brief explanation of the drawing]

FIG. 1 is a side view of the yarn supplying body exchanging device of the present invention, FIG. 2 is a block diagram of the control section, and FIG. 3 is a side view when exchanging the yarn supplying body.
FIG. 4 is a side view of the thread pulling operation when the thread breaks. DESCRIPTION OF SYMBOLS 1. Yarn feeder exchange device, 2. Feeding device, 3. Weft guide device, 4. Yarn feeder, 5. Weft, 6. Winding body, 7. Guide means, 13. Clamper, 14...first sensor, 15...cutter, 17...yarn guide, 19...suction nozzle, 20...guide tube, 25...second sensor, 27...control unit. Patent applicant Tsudakoma Kogyo Co., Ltd. Representative Patent attorney Kuni Nakagawa Younger brother Figure 7 Figure 2 Figure 3

Claims (1)

[Claims] A feeding device that connects the weft yarn ends of a plurality of adjacent yarn feeding bodies and holds the yarn feeding bodies by a winding body in a state where they can be fed at predetermined pitches; a weft thread guide device that detects a break, advances an intake port of a guide tube that can move forward and backward to the weft end, and draws in the end of the weft thread from a new yarn supply body; The feeding device contacts the winding body at two yarn feeding positions, and moves the yarn feeding body attached to one position to the other position. In between, an arc-shaped guide means that always directs the axis of the yarn supplying body toward the yarn guide, and a clamper that holds the transfer tails of the two yarn supplying bodies at the advanced position at both yarn feeding positions are provided. A yarn feeder exchange device characterized by: