JP2691730B2 - Multicolor weft storage method - Google Patents

Description

Description: TECHNICAL FIELD OF THE INVENTION The present invention relates to a weft yarn storing method for a multicolor weft yarn length measuring and storing device.

BACKGROUND ART A drum type weft yarn length measuring and storing device winds a weft yarn around an outer circumference of a drum by a relative rotational movement of a drum and a yarn guide, measures the length, and stores the yarn until the time of weft insertion. When a motor is used as a drive source for this rotational movement, synchronous control is required for the rotation of the motor in relation to the weft insertion movement.

For example, in the invention of Japanese Patent Laid-Open No. 60-28551, in a multicolor weft measuring and storing device, in order to continuously rotate the motor without stopping it during the non-selection period during one repetitive cycle of weft insertion, the selection pick is selected. It is shown that the driving is performed at a rotational speed of several (non-selection period + selection period). However, according to that technology, the amount of weft yarn stored on the drum increases,
There is a drawback that the weft insertion becomes unstable due to the trampling of the threads.

On the other hand, the inventions of JP-A-58-31145, JP-A-59-53743, and JP-A-61-194255 relate to a length measuring and storing device for a multicolor weft yarn, and all of them ((non-selection period + selection) During the first weft insertion cycle of the period), one pick of weft yarn is stored. According to these techniques, after the second cycle of the selection period, it is impossible to follow the weft insertion unless it is rotated at a rotation speed of 1 pick length / 1 cycle (one rotation of the crankshaft of the loom). As a result, the control range of the rotation speed of the motor is widened, stable control is difficult, high-speed response is required, and a large-capacity motor is required.

OBJECT OF THE INVENTION Accordingly, an object of the present invention is to provide a continuous rotary motion for measuring and storing during one repetition of weft insertion,
By reducing the winding amount on the drum and narrowing the control range of the rotational speed of the rotary motion, it is possible to drive even a motor having a small capacity.

Means for Solving the Problems With the above object, the present invention continuously measures the length of each weft yarn during one repetitive cycle of weft insertion by a relative rotational movement of a drum and a yarn guide for each of a plurality of weft yarns. In the multi-color measuring and storing device for storing and storing, when the number of selected picks in one repetitive cycle is i and the number of non-selected picks is j 0 <α <(i · j) / (i
+ J), the pick number α is stored at a substantially constant speed, and the weft yarn is stored at a constant speed for the pick number (i−α) during the selection period.

In this way, the number of selection picks i required for one repetition period is continuously stored in the non-selection period and the selection period in one repetition cycle, and as a result, the motor continuously rotates, so It can be prevented from occurring. Also,
Since the required selection pick number i is distributed in an appropriate state between the non-selection period and the selection period during one repetition, 1
The storage amount during the repeated cycle does not increase, the thread traverses less, and the rotation speed of the feed motor is suppressed to the smallest possible range.

In particular, in the present invention, even if weft insertion is continuously performed for the same weft thread during one repetitive cycle, the minimum weft thread is always wound on the drum, so that a suitable weft thread is appropriately provided between the drum and the weft thread. A stable friction force can be secured.

Configuration of Multicolor Weft Thread Length Measuring and Storage Device FIG. 1 shows the configuration of a two-color weft thread length measuring and storing device 1 as an example of multicolor.

Each of the weft yarn length measuring and storing devices 1 pulls out the weft yarns 2a and 2b from the yarn feeding cone 3, and by a rotational movement of a rotary yarn guide 4, a locking pin is attached to an outer peripheral surface of a lengthwise storing drum 5 for length measuring and storing. By wrapping while locking at 6, the length is measured and it is stored until the time of placing the weft. When the locking pin 6 retracts at the weft insertion timing, the selected weft yarns 2a, 2b are wefted into the warp yarn opening by the corresponding weft insertion nozzle 7. The order of this weft insertion is preset as one constant exchange within one repeating cycle of weft insertion.

Since each weft yarn length measuring and storing device 1 is of an electric type, each yarn guide 4 is driven by a dedicated feed motor 8 and controlled by a corresponding control device 9.

 Next, FIG. 2 shows the configuration of the control device 9.

This control device 9 includes an encoder 10, a pulse control unit 11, and a deviation counter 13 and a drive circuit 14 inside a drive control unit 12 in order to realize pulse feedback tracking control. Is connected to the feed motor 8 to be controlled. The pulse control unit 11
Is a setter 19 for the number of windings T (number of turns / 1 pick) as the weft yarn storage amount per pick on the drum 5, in addition to the encoder 10, and a selection indicating the number of weft insertions selected in one repeating cycle of weft insertion. It is also connected to the setter 19 for the number of picks i and the setter 20 for the number of unselected picks j that indicates the number of picks that are not selected in one repeat cycle. The rotation of the feed motor 8 is detected by the pulse generator 15 and fed back to the down input terminal of the deviation counter 13. The basic speed of the feed motor 8 is set by the speed setter 16 inside the drive control unit 12, and the output end of the deviation counter 13 and the drive circuit 14 are set.
It is given as an electric velocity signal to the summing point 17 between the input terminal of the and.

Description of multicolor weft yarn storage method The rotation of the main shaft of the loom during the weaving operation is detected by the encoder 10 as the room pulse L (pulse number / one rotation of the loom) of the rotation command pulse train, and the pulse control unit 11 selects the selected pick number. Based on i, the number of unselected picks j, and the number of turns T, conversion is usually performed by frequency division, and conversion pulse
[Number of pulses / one rotation of the loom] is given to the up input end of the deviation counter 13. On the other hand, the deviation counter 13 receives the rotation amount of the feed motor 8, that is, the feedback pulse p [the number of pulses / one rotation of the feed motor] from the pulse generator 15 as a down input and outputs an analog amount proportional to the deviation Δ [the number of pulses]. Signal addition point 17
Is applied. As a result, the drive circuit 14 becomes the speed setter.
In addition to the speed signal V of the constant basic speed from 16 and the fluctuation amount due to the signal of the deviation Δ, an analog drive output is generated, whereby the feed motor 8 is rotated at a substantially constant speed, and Follow the rotation. In this way, when the necessary weft threads 2a and 2b are respectively stored on the outer circumference of the drum 5, the deviation Δ of the deviation counter 13 becomes “0”, so that the feed motor 8 is supplied by the speed setter 16. It will continue to rotate only at a constant base speed.

As already mentioned, weft insertion continues in a predetermined selection order for two colors, weft threads 2a, 2b, during one repeating cycle. One repetitive cycle of filling is
According to the conventional display, it is represented as (i × j), and the total number of picks in one repeating cycle at this time is (i + j).

Now, the number of rotations of the feed motor 8 during the non-selection period is n
_j [rpm], the rotation speed of the feed motor 8 during the selection period is n _i [rpm], and the storage amount αT during the non-selection period is
[Number of turns] is stored, and the storage amount (i-
α) Consider storage for T [number of turns]. Here, T is the number of turns [number of turns / 1 pick], and α is 0.
It is a numerical value defined by <α <(i, j) / (i + j).

If the acceleration / deceleration time of the feed motor 8 is not considered, the storage amount of each loom is represented as follows, as the loom rotational speed N [rpm].

From the above formula, the rotation speeds n _j and n _i of the feed motor 8 are
Each is represented by the following equation.

By the way, since the pulse control unit 11 outputs the conversion pulse r during one rotation of the loom, the pulse control unit 11 generates r.N [the number of pulses] per unit time (minute). If the number of rotations of the feed motor 8 is n [rpm] and the number of pulses output by the pulse generator 15 during one rotation of the feed motor is p, only pn [pulses] are output per unit time. To be done. Therefore, if the control is properly performed, the number of converted pulses r generated can be obtained by the following equation.

Here, output pulse during non-selection period = r _j [number of pulses /
1 rotation of the loom], and output pulses during the selection period = r _i [number of pulses / one rotation of the loom], they are represented by the following equations.

The pulse control unit 11 realizes initial control by switching and outputting these output pulses r _i and r _{j according} to the selection period and the non-selection period.

By the way, since these values are not generally integers,
It is considered that the number of pulses per one rotation of the loom is set to be an integer in each of the selection period and the non-selection period.

Therefore, the output pulse during the selected period is r _i ′ [number of pulses /
When the output pulse during the selection period] and the non-selection period is r _j ′ (number of pulses / non-selection period), they are represented by the following equation.

r _i ′ = i · r _i = (i−α) · p · T r _j ′ = j · r _j = α · p · T Such pulse conversion is performed by a frequency divider inside the pulse control unit 11. Done.

If the frequency division ratio during the selection period is C _i and the frequency division ratio during the non-selection period is C _j , then they are obtained by the following formula.

Now, when the number of storage picks α during the non-selection period is set to 1,
The division ratios C _i and C _j are as follows.

Example In FIGS. 3 and 4, one repetitive cycle of weft insertion is i × j = 5 × 5, and the number of stored picks is α = 1, α = 0.
An example when set to 5 is shown. In these figures, one repetitive cycle of weft insertion, that is, the non-selection period and the selection period are plotted on the horizontal axis, and the number of stored picks is plotted on the vertical axis. The black triangle mark indicates the weft insertion operation for the weft thread 2a, and the white triangle mark indicates the weft insertion operation for the weft thread 2b. Although this weft insertion is actually performed for a predetermined period of time, it is simply shown in these figures that the weft insertion operation is completed instantly. Therefore, the actual storage amount becomes smaller than that shown in the figure.

As is already clear, according to the method of the present invention
2a is stored at a constant speed for the number of storage picks α during the non-selection period, and is stored at a constant speed for the number of remaining storage picks (i−α) during the selection period. As a result, during the non-selection period and the selection period, that is, during one repetitive cycle, the number of selected picks i is stored. As is clear from the figure, during the non-selection period, for example, when α = 1, weft yarns 2a for one pick are stored, and when α = 0.5, weft yarns 2a for 0.5 picks are respectively stored. It is stored. Then, during the selection period, the weft yarn 2a is stored at a speed faster than that in the non-selection period, but since weft insertion is continuously performed for 5 picks, when the weft insertion is completed,
The remaining amount of storage is decreasing. However, of the five weft insertions, the storage amount becomes 0 at the last weft insertion, but the storage amount does not become 0 at the completion of the previous weft insertions. This is because the number of picks is preliminarily wound by 1 or 0.5 picks during the non-selection period, and the remaining required picks are stored at a constant speed during the selection period. As described above, according to the present invention, even if the picking is continuously performed during the selection period, the storage amount does not become 0 in the middle thereof,
Therefore, an appropriate frictional resistance can be secured between the drum 5 and the weft thread 2a wound around it, and the weft insertion does not become unstable.

On the other hand, in the conventional case, as shown in FIG. 5, the i pick length / (i +
j) Since the weft yarns are stored at a constant speed of a cycle, during the non-selection period, the number of stored picks (i × j) /
The amount of (i + j) will be stored, and many weft threads will be wound in the non-selection period. This is because the weft thread traverses on the drum, as described above, and the weft insertion operation becomes unstable.

Further, as shown in FIG. 6, according to another conventional example, only one pick required for the first weft insertion is carried over from the non-selection period to the first one pick weft insertion period of the subsequent selection period. Weft is stored. According to this, during the non-selection period, the number of storage picks is j / (j + 1), which is smaller than that of the conventional example of FIG. 5, but after the second cycle of the selection period. When the four weft insertions are continuously continued, the weft insertion amount on the drum becomes 0, the friction coefficient between the weft thread and the drum becomes small, and the weft insertion becomes unstable, It will be unavoidable because it is defective. On the other hand, in the present invention, during the selection period,
Since the remaining required number of picks (i-α) is stored at a constant speed, the current weft insertion for a certain weft thread is completed, and subsequently the weft insertion is continued for the same weft thread. The quantity is never zero, so the weft condition is more stable than the conventional one. Also, the rotation speed of the feed motor in the second cycle and thereafter during the selection period can be suppressed to be lower than that of the conventional one.

Other Embodiments In the above embodiments, the selection order of constant exchange is planned, but the embodiment of FIG. 7 assumes free exchange. Such a freely exchangeable weft insertion pattern is specified by the weft thread selecting circuit 25 in accordance with the rotation of the main shaft of the loom, but the pre-reading circuit 26 reads it out in advance and selects the number of selected picks for each repeating cycle unit. i and the number j of non-selected picks are obtained, and the pattern control unit 11 is controlled by this. As is apparent from this embodiment, the present invention is applicable not only to constant exchange but also to so-called free exchange.

Further, the above-described embodiment describes only two-color exchange as an example. However, the invention is equally applicable to multicolor exchange. That is, for example, four color weft threads 2a, 2
When one repetition cycle is set for b, 2c, and 2d as shown in FIG. 8, when one weft thread 2a is viewed, the other three weft threads 2b, 2c, and 2d correspond to the non-selected pick number j. Since the same can be said for the other three-color weft yarns, the above control can be applied to multicolor weft insertion from the above viewpoint.

Further, the weft length measuring and storing device 1 may be a drum rotating type. In the case of a drum rotation type device, the feed motor 8 drives the drum 5.

Effects of the Invention According to the present invention, the following operational effects are obtained.

First of all, since the feed motor is continuously rotating during the operation of the loom, it is possible to reliably prevent the weft thread from spreading.

Next, since the preliminary winding amount during the non-selected period is reduced, there is no stepping of the weft yarn in the stored state, and stable storage operation and weft insertion are performed.

Especially, in the process of continuous weft insertion, the winding amount of the weft thread on the drum does not become 0, so the frictional resistance between the weft thread and the drum being unwound during weft insertion does not change, and The insertion state is stabilized.

Further, as compared with the conventional technique, the rotation speed of the feed motor can be suppressed to be low, so that the control range of the rotation speed is narrowed, so that even a motor having a small capacity can perform sufficiently stable control.

[Brief description of the drawings]

FIG. 1 is a schematic side view of a weft yarn length measuring and storage device, FIG. 2 is a block diagram of a control device, FIGS. 3 and 4 are graphs of changes in storage amount according to the present invention, FIGS. FIG. 7 is a graph showing a change in storage amount according to a conventional one, FIG. 7 is a block diagram of another embodiment, and FIG. 8 is an explanatory diagram of a four-color wedging order. 1 …… weft measuring and storing device, 2a, 2b …… weft, 5 ……
Drum, 7 ... weft insertion nozzle, 8 ... feed motor, 9 ... control device, 10 ... encoder, 11 ... pulse control unit, 12 ... drive control unit, 13 ... deviation counter, 14 ...
… Drive circuit, 15 …… Pulse generator, 16 …… Speed setter, 17 …… Addition point, 18,19,20 …… Setter, 25
... weft selection circuit, 26 ... look-ahead circuit.

Claims (1)

(57) [Claims] 1. A multicolor weft length measuring and storing device for continuously measuring and storing each weft yarn by a relative rotational movement of a drum and a yarn guide for each of a plurality of weft yarns.
For a certain weft thread in a repeated cycle, when the number of selected picks is i and the number of non-selected picks is j, the weft thread is 0 <α <(i · j) during the non-selected period of one repeating cycle.
/ (I + j) is stored by rotational movement at a substantially constant velocity for the number of picks α, and the weft thread is rotated at a substantially constant velocity for the number of picks (i-α) during the selection period of one repeating cycle. A multicolor weft storage method characterized by storing.