JPH01192850A - Weft-inserting method in shuttle-free weaving machine - Google Patents

Abstract

PURPOSE:To avoid the mistake in the weft-inserting operations even in high speed weaving, by controlling the weft insertion at the controller by the detection signals from the shedding sensor on the actual shed of the warp and the preset programs. CONSTITUTION:In the course where the warp 4 shifts from the shed shown with the dotted chain line to the maximum shed, the warp comes to the point crossing the one of the upper edge 11 and lower edge 12 of the air guide, for example, the low edge 12, which is extended in the extension direction of the weft 9 on the cloth fell side 8 of the reed 5, and the shed sensor 1 detects that the actual shed can accept warp inserting. Then, the detection signals are input to the controller and the controller drives and controls the waft-inserting mechanism by the detecting signals and the preset programs whereby the weft inserting operation is optimally controlled without expansion of the existing area acceptable to weft insertion.

Description

[Detailed description of the invention] Industrial applications The present invention relates to a weft insertion method for a shuttleless loom.

Conventional technology Basically, weft insertion on a shuttleless loom involves setting a program in advance in the control function section based on the rotation angle of the main shaft.
When the loom is operating, the control function unit inputs the actual rotation angle signal of the main shaft to the control function unit, and the control function unit adjusts the weft rotation angle at various operating times, such as when starting weft insertion or when starting weft insertion assistance on pneumatic shuttleless looms. It has a structure in which drive control is performed by outputting a control signal to the applicable component parts of the input system (Special Publication Publication No. 62-29).
(See Publication No. 538).

Problems to be Solved by the Invention Looking at the possible weft insertion range in a weft insertion system, it is uniquely determined, for example, the 1/3 rotation angle range of the main shaft. However, when a shuttleless loom is in operation, due to the warp tension between the back roller and breast roller and the back and forth movement of the reed, so-called pumping occurs in which the front of the weave shifts back and forth, and the pumping starts from the front of the weaving. The actual opening amount of the warp threads differs slightly depending on the weaving cycle. For this reason, the higher the operating speed of a shuttleless loom, the shorter the available weft insertion time. The flying tip of the weft yarn flying on the jet flow of the insertion nozzle comes into contact with the warp yarn with the defective opening, making it easy to cause a weft insertion error.

Therefore, if we widen the possible range of weft insertion by narrowing the range of other weaving operation angles, it will put strain on operations such as beating the reed, warp thread shedding, and weft thread cutting that follow weft insertion, and the operation timing of the entire shuttleless loom will become smooth and continuous. It is difficult to implement the system, and it is difficult to adopt it suddenly.

Therefore, the present invention provides a weft insertion method for a shuttleless loom that can handle higher speeds without expanding the existing weft insertion range.

Means for solving the problem A detection signal from a shedding sensor that detects the actual shedding amount of the warp threads is manually inputted to a control function section, and this control function section controls the weft insertion system based on the detection signal from the shedding sensor and a preset program. to drive and control.

Example Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

As shown in Figure 1.2, in this embodiment the aperture sensor 1
, a control function section 2 , and a weft insertion system 3 .

The shedding sensor 1 detects the actual shedding amount of the warp yarns 4, and is attached to a reed holding stand 6 via a bracket 7 so as to move back and forth together with the reed 5, starting from the weaving front 8. The control function unit 2 outputs the detection signal Q when the actual shedding amount formed by the warp thread 4'-system and the bobbin thread reaches an opening that allows weft insertion without interfering with the flight of the weft thread 9 during weft insertion. It is designed to output to . Since this embodiment uses a pneumatic shuttleless loom, the shedding sensor l detects when the warp threads 4 move from the closed state shown by the dashed line in FIG. 2 to the maximum open state shown by the imaginary line in FIG. In the process, as shown by the solid line in FIG. When it comes to the position where it intersects the edge 12, the presence of this warp thread 4 is detected, and the warp thread 4
Detection signal Q indicating that the actual shedding amount has reached the opening degree that allows weft insertion.
It is designed to output . Since there is a time lag between the output of the signal Q and the activation of the weft insertion system 3, which will be described later, the sensor 1 is placed at a position that takes this lag into account. That is, it is preferable to arrange the warp threads 4 at a position slightly closer to the warp line than the solid line position.

In addition, the control function section 2 uses the program to perform detection based on the detection signal Q of the aperture sensor 1 in a certain weaving cycle (hereinafter referred to as =3-detection weaving cycle) 15, as shown in FIG. The control signal K for driving and controlling the weft insertion system 3 in the next weaving cycle 16 after the weaving cycle 15 may be output. Furthermore, since the shedding sensor 1 uses a transmission type that detects whether or not the warp threads 4 have passed between a light receiving part (oscillator part) and a light receiving part (vibration receiving part) that face each other, the warp threads 4 are In the process of transitioning from the open state to the closed state, the detection signal Q
Output.

The control function unit 2 has a program set in advance, and when the detection signal Q of the aperture sensor I is input, this detection signal Q
The weft insertion system 3 is driven and controlled by the program and the program.

The weft insertion system 3 includes a weft storage device 20 and a weft insertion nozzle device 21.
and an auxiliary nozzle device 22, and the weft yarn 9 pulled out from the yarn feeder 23 in each weaving cycle is transferred to the weft storage device 20.
The structure is such that more than one weft insertion pick is stored in the weft inserter, and the stored weft yarn 9 is inserted by the jet flow of the weft insertion nozzle device 21 and the jet flow of the auxiliary nozzle device 22. Specifically, during normal operation of the shuttleless loom, the guide 25 rotates the weft yarn 9 around the drum 24 in the weft storage device 20 so that the weft yarn 9 pulled out from the yarn feeder 23 is inserted into the drum 24 by one pick. Wrap it around and store it,
A locking body 2 placed at the end of the drum 2.1 on the weft insertion nozzle side
6 is pulled out from the drum 24 at a predetermined timing, and the weft 9 is inserted from the drum 24 through the air guide 10 by jet flow from the weft insertion nozzle 27 in the weft insertion nozzle device 21 and the auxiliary nozzle 28 in the auxiliary nozzle device 22, On the contrary, the locking body 26 is pushed into the drum 24, and the weft yarn 9 is anchored thereto, thereby completing one pick weft insertion.

To explain the operation of the above embodiment, during normal operation of the shuttleless loom, the shedding sensor 1 sends the detection signal Q to the control function section 2 in the process of changing the warp threads 4 from the closed state to the maximum open state in the detection weaving cycle 15. When the input is skipped, the control function unit 2 outputs the detection signal Q of the aperture sensor 1 and the preset progera 1.
8 drives and controls the weft insertion system 3 in the next weaving cycle I6 after the detected weaving cycle 15. In other words, the control function unit 2 causes the weft insertion nozzle 27 to pre-inject the weft insertion nozzle 27 immediately before the start of weft insertion when the expected actual opening amount of the warp threads 4 becomes the opening degree that allows weft insertion, and pulls out the locking body 26 from the drum 24 at the start of weft insertion. , the locking body 26 is plunged into the drum 24 based on a signal that detects that the weft yarn 9 has been unwound from the drum 24 a predetermined number of times, while the weft yarn 9 is released from the auxiliary nozzle 28 while the weft yarn is flying. An auxiliary injection is made to follow the trailing edge.

Note that the present invention is not limited to the above-mentioned embodiments, and although not shown in the drawings, for example, the opening of the warp threads 4 can be changed based on the distance between the warp yarns 4 or the lower threads and the opening loss sensor. It can also be configured as a reflective type that detects the amount.

According to the present invention, it is possible to drive and control the weft insertion system based on the shedding amount of the warp threads, so that the operation of a shuttleless loom can be improved without expanding the existing range of weft insertion. Even if the speed is set to high speed, weft insertion can be optimally controlled to prevent weft insertion errors.

[Brief explanation of the drawing]

Fig. 1 is a schematic configuration diagram showing an embodiment of a weft inserting device for a shuttleless loom used in the present invention, Fig. 2 is a side view showing the main parts of the same embodiment, and Fig. 3 is an explanation of the operation of the present invention. It is a diagram. 1. Opening sensor, 2. Control function section, 3. Weft insertion system,
Q...Detection signal. =8-

Claims (1)

[Claims] (1) A detection signal from a shedding sensor that detects the actual shedding amount of warp threads is input to a control function section, and this control function section drives and controls the weft insertion system based on the detection signal from the shedding sensor and a preset program. A weft insertion method for a shuttleless loom featuring the following.