JPS60155756A - Adjustment of length measuring amount in weft yarn length measuring apparatus of shuttleless 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 involves winding and sub-lengthening the weft supplied from the weft supply section, and temporarily winding and storing the measured weft, and when inserting the weft, the wound and stored weft is The present invention relates to a method for adjusting the length measurement amount in a weft length measuring device for a shuttleless loom that is pulled out.

BACKGROUND OF THE INVENTION In general, fluid jet looms are provided with a weft length measuring device for measuring a predetermined amount of weft yarns in advance and temporarily storing the measured weft yarns. This type of weft length measuring device measures the length of the weft yarn supplied from the weft supply section through the opening at the end of the yarn winding tube that rotates around the drum relatively, and measures the weft yarn length by winding it around the drum. - A weft length measuring device is employed in which the weft is wound and stored, and the wound and stored weft is pulled out at the time of weft insertion.

The sub-length loading amount of this winding method is controlled by a weft locking body disposed near the circumferential surface of the drum to control the measured length of the weft wound around the drum and the transition in the weft drawing direction. Conventionally, in order to change the measured length of the weft yarn according to the weaving width of the woven fabric, for example, a drum is formed from a plurality of divided drum pieces to form a yarn winding surface, and a predetermined drum The pieces are configured so that their positions can be adjusted in the radial direction of the drum,
Dora lX- of the same drum piece! By changing the winding diameter based on the position adjustment in the l' radial direction, the length measurement amount is changed in accordance with the change in the weaving width of the woven fabric. However, in this sub-length adjustment means, when the weave width change is large, the winding diameter change amount becomes large, and the winding yarn unwinding resistance in this sub-length device fluctuates greatly. Therefore, there is a large fluctuation in the weft tension which greatly affects the weft insertion condition, and it becomes necessary to adjust the weft insertion conditions, which is a very difficult and complicated task.

Purpose The present invention has been made in consideration of the above-mentioned problems, and its purpose is to adjust the amount of winding diameter change when adjusting the length measurement amount according to the weaving width change in a winding type weft length measuring device. It is an object of the present invention to provide a method for adjusting the weft sub-length m, which can stabilize the winding diameter unwinding resistance by reducing the weft sub-length m.

Structure In order to achieve the above-mentioned object, in the present invention, when adjusting the sub-length in accordance with the change in the weave width, the length measurement is performed by changing the number of windings per weft insertion and making fine adjustments by changing the winding diameter. A quantity adjustment method was adopted.

EXAMPLE Below, an example embodying the present invention will be described based on the drawings.A support bracket 2 is fixed to the upper end of a side frame 1 of a fabric 111, and a rotation support shaft 3 is attached to the bracket 2. Possible through-fitting. Same support shaft 3
A weft guide hole 3a for guiding the weft Y supplied from a weft supply section (shown in the figure) such as cheese is provided along the axis. A timing pulley 4 is fixed to the base end side of the rotation support shaft 3, and a timing belt 5 is hung around the pulley 4. The belt 5 is driven by a motor 6 different from the machine rotation drive source, and as the motor 6 rotates, the rotation support shaft 3 is rotated.

The motor 6 is connected to a variable frequency power source (not shown), and its rotational speed can be changed arbitrarily.

In the vicinity of the support bracket 2, a thread winding tube 7 is attached to the rotary support shaft 3 so as to communicate with a weft guide hole 3a, and its tip is opened near a thread winding surface which will be described later. A support member 8 is supported on the distal end side of the rotary support shaft 3 so as to be relatively rotatable, and a disk-shaped support plate 9 is rotatably supported on the front side of the rotary support shaft 3 (on the right side in FIG. 1). It is fixed. An unrolled piece 10 is fixed to the front surface of the peripheral edge of the support plate 9, and three adjustment pieces 11 are provided so that their positions can be adjusted substantially along the radial direction of the support plate 9. Each adjustment piece 11 is fitted with a screw 12 and a nut 1 along a guide groove 9a provided substantially along the radial direction of the support plate 9.
3, the mounting position can be adjusted. The unwound piece 10 and the plurality of adjustment pieces 11 form a thread winding surface.

Above the unwound piece 10 is a pair of electromagnetic solenoids 16.1.
Drive bins 16a and 17a are provided with drive bins 16a and 17a that are alternately projected based on an operation command from a control device (not shown).
(hereinafter referred to as first and second weft-related iF bodies) intersect with the upper surface of the unwound piece 10, that is, which side of the bobbin winding.

A cover 1 covering the thread-wrapped tube 7 is provided on the front of the support bracket 2.
Eleven magnets 4 are attached to the cover 14 and support plate 9, and magnets 15 that are attracted to each other are provided facing each other. Therefore, when the motor 6 is driven to rotate and the rotary support shaft 3 is rotated, the thread-wound tube 7 rotates integrally with the support shaft 3, and the support plate 9 does not rotate due to the attraction action of the magnet 15. held stationary.

Now, when the weft yarn Y is wound a predetermined length while being held by the first weft stopping body 16a intersecting with the upper surface of the unwound piece 10, as shown in FIG. 16a is separated from the bobbin winding surface, and the weft wound on the bobbin winding surface by the intermediate body 16a moves to the tightening side, that is, to the right side in FIG. 17a makes the connection +L. In this state, the weft yarn Y is rotated a predetermined number of times (3 in Fig. 1).
When the yarn is wound (twice), the first pI yarn locking body 16a protrudes again and intersects with the yarn winding surface. Therefore, if the winding diameter of the thread-wrapping surface in FIG. 1 is R, the amount of the weft Y that is wound and stored is 3×πR. That is, the weaving width of the woven fabric is 3×πR.

Next, a length measurement amount adjustment method will be described in the case where the weave width of the woven fabric is changed to be larger than 4×πR.

First, the frequency of the variable frequency N source (not shown) is changed to reduce the rotational speed of the motor 6 to 4/3 of that in the case of FIGS. 1 and 2.
Change to double. As a result, the number of times the weft is wrapped and stored per weft insertion is 4 times, and the amount of stored weft is 4×
It becomes πR. Subsequently, each adjusting piece 11 is moved in the direction from the center of the support plate 9 to the center of the support plate 9, and the winding number piece 10 and the adjusting piece 11 are changed based on this change in the length measurement amount to match the winding storage amount to the weaving width of the woven fabric. The arrangement relationship is as shown in Figure 3.4.

That is, the winding diameter of the thread winding surface is R+δ as shown in FIG.
However, since the number of times the stored weft is wound is changed from three to four times, the amount of change in the winding diameter δR is small.

Therefore, even if the weaving width of the woven fabric is changed significantly from 3 x πR to 4 x πR or more, there is little change in the winding diameter.
The unwinding resistance when pulling out the weft yarn from the yarn winding surface does not change significantly after changing the length measurement amount. As a result, the tension of the weft yarns, which influences the flying state of the weft yarns inserted by the fluid, is stabilized, and a woven fabric of good quality can be obtained.

In the present invention, as described above (7) although it was possible to suppress fluctuations in the weft unwinding resistance by the length measurement amount changing means (7), for example, the
As shown in the figure, when the conventional means of adjusting the length m by simply adjusting the adjustment piece 11 without changing the number of windings of the stored weft yarn is adopted, the adjustment piece 11
The arrangement relationship is as shown by the chain line in FIG. In other words, the amount of movement of the adjustment piece 11 increases, and the number of pieces of thread winding is 1.
0 and the winding diameter of the bobbin winding surface formed by each adjustment piece 11 is changed greatly. Therefore, the unwinding resistance of the weft threads pulled out from the thread winding surface varies greatly after the length measurement amount is changed, which adversely affects the quality of the woven fabric. Naturally, when the winding diameter of the bobbin winding surface changes greatly, the bobbin winding surface cannot always be maintained in a circular shape, and the state in which the weft thread is wound around the bobbin winding surface ζ1 becomes unstable.

As is clear from the problems that exist in the conventional length measurement amount adjustment method, the length measurement amount adjustment method of the present invention reduces the number of windings of the stored weft yarn (=1 number of windings per weft insertion). By adopting the process of changing the yarn winding surface, it is possible to reduce changes in the winding diameter on the yarn winding surface, suppress fluctuations in weft unwinding resistance after changing the weaving width, and always perform stable weft insertion.Of course, By reducing the number of changes in the winding diameter of the thread-wrapping surface, the thread-wrapping surface can always be maintained in a nearly cylindrical shape.

Note that the present invention is not limited to the above-mentioned embodiments; for example, when the amount of stored winding is above a predetermined amount, the winding operation of the thread-wrapped tube is stopped, and when the amount of stored winding is less than a predetermined amount, the winding operation of the thread-wrapped tube is stopped. In this case, it is also possible to embody the present invention in a so-called yarn feeder type length measuring device in which the winding tube is rotated and the weft is fed onto the winding surface. in this case,
The rotational speed of the bobbin winding tube is changed by changing the weft insertion program within the control device which sends an operating command to the motor for driving the bobbin winding tube based on a detection signal from the winding storage amount measuring device.

Effects As detailed above, the length measurement amount adjustment method of the present invention can reduce the amount of change in the winding surface on the bobbin winding surface even when the weaving width of the woven fabric is changed significantly, which does not affect the quality of the woven fabric. It has the excellent effect of stabilizing the weft unwinding resistance exerted on the yarn winding surface.

[Brief explanation of the drawing]

The drawings show an embodiment embodying the present invention; FIG. 1 is a partially cutaway side view, FIG. 2 is a front view, and FIG. 3 is a partially cutaway side view showing changes from FIG. FIG. 4 is a front view showing a change from FIG. 2, and FIG. 5 is a partially cutaway side view when the length measurement R is changed only by changing the winding diameter. Motor 6, thread-wrapped tube 7, adjustment piece 11, weft Y. Patent applicant: Toyota Industries Corporation, Agent
Patent Attorney On 1) Hironobu Figure 1 1617 Figure 2 Figure 8 Figure 4

Claims (1)

[Claims] 1. In a weft length measuring device in which the weft supplied from the weft supply unit is wound on the J plane and the weft is pulled out when inserting the weft, the weft can be changed to the secondary length according to the weave width change. When making adjustments, the number of turns per weft insertion is changed to reduce the amount of change in the winding diameter, and fine adjustments are made by changing the winding diameter. How to adjust the length.