JP2689265B2 - Measuring storage controller - Google Patents

Description

Description: TECHNICAL FIELD OF THE INVENTION The present invention relates to a multicolor weft measuring and storing device, and more particularly to a control device for a feed motor thereof.

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 weft yarn at the time of weft insertion. When the drive source of this rotary motion is a feed motor, synchronous control is required for the rotary motion of the feed motor in relation to the weft insertion motion.

By the way, in the type in which the feed motor rotates only during the weft yarn selection period, the feed motor stops during the weft yarn non-selection period. Therefore, the control type of the feed motor is eventually on / off control. According to the on / off control, the drive efficiency of the feed motor is poor, and discontinuous tension is repeatedly applied to the weft thread, which makes the length measurement storage operation unstable.

Therefore, the specification of Japanese Patent Application Laid-Open No. 60-28551 describes that
It is shown that the feed motor is not stopped during the repeating cycle and is continuously rotated at a constant average speed. According to that technology, even during the non-selection period of weft,
Since the feed motor rotates continuously at a constant speed,
Although the frequent on / off control as described above is eliminated, on the other hand, when the number of picks for weft insertion increases with one repetitive sille, the amount of weft yarns stored on the drum increases, and for certain types of weft yarns, the amount of weft yarns adjoining each other increases , The horizontal insert becomes unstable.

On the other hand, JP-A-58-31145, JP-A-59-53743, and JP-A-
As shown in Japanese Patent No. 61-194255, the weft storage amount on the drum is such that only a small amount of the weft yarn is stored on the drum during the non-selection period, and the weft insertion can be done during the subsequent selection period. It can be reduced by continuously storing a certain amount of weft thread. However, in this case, since the rotation speed of the feed motor is switched in one repetitive weft insertion cycle, adverse effects are apt to appear depending on the type of weft yarn as in the case of the on / off control described above.

From such a background, the rotational movement of the feed motor of the weft yarn length measuring and storage device is an item that should be appropriately set according to the type of weft yarn.

OBJECTS OF THE INVENTION Therefore, an object of the present invention is to set the rotary motion of a feed motor to an appropriate state according to the type of weft yarn, while considering the weft insertion mode of one repetitive weft insertion cycle.

Therefore, according to the present invention, in continuously rotating the feed motor of the weft yarn length measuring and storing device, speed priority is given to continuously rotate the feed motor at an average constant speed during one repeating cycle of weft insertion. And the control method of the winding amount priority in which the feed motor is rotated at a low speed during the non-selection period of the weft thread in one repetitive cycle of the weft insertion and at a high speed during the selection period. By selectively selecting one of these control methods according to the repeating mode and the type of weft yarn, the above-mentioned drawbacks of the conventional technique are solved.

Specifically, the length measurement storage control device of the present invention,
For each of a plurality of weft yarns, the relative rotational movement of the drum and the yarn guide measures and stores each weft yarn, and in the multicolor weft yarn length measuring and storing device (1), the number of windings required to select the number of weft yarns A multicolor weft measuring and storing device (1) for one repetitive cycle of weft insertion by the amount of rotation corresponding to the amount
1 repetition of the first weft insertion corresponding to the combination of the number of selected picks and the number of non-selected picks such that the maximum winding amount when the feed motor (8) is continuously rotated at a constant speed is equal to or less than a predetermined value Regarding the cycle group, a first command unit (11) that continuously generates a number of command pulses corresponding to the winding amount required for the number of selected picks in a constant cycle over one repeating cycle, and the maximum winding amount. Regarding the second repetitive cycle group of the second weft insertion corresponding to the combination in which the value becomes larger than the predetermined value, the number corresponding to the amount equal to or less than the predetermined value in the period corresponding to the number of non-selected picks in one repetitive cycle. Second command pulse is generated, and the number of command pulses corresponding to the remaining winding amount is generated during the period corresponding to the number of selected picks.
The command pulse from the first command section (11) and the command pulse from the second command section (12) are selectively selected according to the combination of the command section (12) and the number of selected picks and the number of non-selected picks. And a drive control unit (14) for rotating the feed motor (8) of the multicolor weft measuring and storing device (1) in response to a command pulse output from the switch unit (13). It consists of and.

Example First, FIG. 1 shows the configuration of a two-color weft yarn length measuring and storing device 1 as an example of multiple colors.

Each weft yarn length measuring and storage device 1 pulls out the corresponding weft yarns 2a and 2b from the yarn feeding cone 3 and locks it on the outer peripheral surface of the lengthwise storing drum 5 by the rotational movement of the rotary yarn guide 4. The length is measured by wrapping it while locking it with the pin 6, and it is stored until the time of inserting the weft. When, for example, the weft thread 2a is selected from the weft threads 2a, 2b in the stored state, the corresponding locking pin 6 retracts at the weft insertion timing, so that the weft thread 2a is inserted into the warp thread opening by the weft insertion nozzle 7. To be done. This weft insertion order is preset within one repetitive cycle of weft insertion as a constant exchange.

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

 FIG. 2 shows the configuration of the length measurement storage control device 9.

This length measurement storage control device 9 includes an encoder 10 and a first command unit 1 in order to realize pulse feedback tracking control.
1, a second command unit 12, a switching unit 13, and a drive control unit 14 are provided.

The first command unit 11 and the second command unit 12 are composed of pulse conversion circuits 15, 16, 17 and frequency dividing circuits 18, 19, 20 connected in series between the encoder 10 and the switching unit 13. There is. Then, these pulse conversion circuits 15, 16, 17
Is connected to a setter 21 for the number of turns T [number of turns / 1 pick] required for weft insertion of one pick, a setter 22 for the number i of picks selected in one repetitive cycle of weft insertion, and a frequency dividing circuit. 18, 19 and 20 are connected to the setter 22 and the setter 23 for the number j of non-selected picks in one repeating cycle.

The switching unit 13 includes a first command unit 11 and a second command unit 12
And the drive control unit 14 between the selector 24, the knot circuit 25, and 2.
One AND circuit 26, 27 and a switching circuit 28 are included, and the output of the first command unit 11 or the two outputs of the second command unit 12 are alternately selected and sent to the drive control unit 14. In addition, the setting device 2
Both 2 and 23 are switched by the code conversion circuit 29.
It is also connected to 8.

Further, the drive control unit 14 internally includes a deviation counter.
30 and speed setter 31, which add point 33
After that, it is connected to the drive circuit 34 and connected to the feed motor 8 to be controlled. In addition, this feed motor 8
Is detected by the pulse generator 32 and fed back to the down input of the deviation counter 30.

During the weaving operation, rotation of the main shaft of the loom is caused by the encoder 10 to generate a rotation command pulse train, that is, a room pulse L.
Detected as [number of pulses / one rotation of the loom], the first command unit
11 and the pulse conversion circuits 15, 16 and 17 of the second command unit 12. These pulse conversion circuits 15, 16 and 17 have the number T of turns required to insert the room pulse L into one pick.
The pulse train is converted into a predetermined pulse train based on the selected pick number i in one repetitive cycle of weft insertion and sent to the respective frequency dividing circuits 18, 19, 20. Here, each of the frequency dividing circuits 18, 19 and 20 changes the frequency division ratio based on the number j of non-selected picks, and according to the frequency division ratio, a predetermined number of output pulses R, Ri, Raising Rj. Then, these output pulses R, Ri, Rj (the number of pulses / one rotation of the loom) are determined according to the weft insertion mode during one repetitive weft insertion cycle.
It is alternatively selected by the switching unit 13 and is input to the drive control unit 14. If the switching circuit 28 is set by the code conversion circuit 29 so that only the output of the first command unit 11 is valid, the output pulse R is directly sent to the up input terminal of the deviation counter 30. Further, when the switching circuit 28 is set by the code conversion circuit 29 so that only the two outputs of the second command section 12 are made effective, the frequency dividing circuits 19, 20 are
The output pulses Ri and Rj of the deviation counter 30 are selectively selected according to the “H” level or “L” level signal from the selector 24.
Will be sent to the up input end of.

Therefore, the deviation counter 30 receives the output pulse R or the output pulses Ri, Rj at the up input end, and the rotation speed of the feed motor 8 at the down input end, that is, the feedback pulse p from the pulse generator 32 (pulse number / feed motor). 1 rotation] is used as the down input, and the deviation Δ
An analog amount signal proportional to the [pulse number] is added and applied to the combining point 33. As a result, the drive circuit 34 receives the signal of the constant basic speed from the speed setter 31 and the signal of the fluctuation due to the deviation Δ, and generates an analog drive output. Rotate at the speed of to make the loom follow the rotation. In this way, when the required amount of weft yarns 2a and 2b are respectively stored on the outer periphery of the drum 5, the deviation Δ of the deviation counter 13 becomes “0”, so that the feed motor 8 is set by the speed setter 16. It will continue to rotate only at the given basic speed.

Now, one repeat cycle of horizontal insertion is (i × j) =
It is assumed that two weft threads 2a and 2b are alternately picked up by 5 picks at (5 × 5).

Even if the winding amount of the weft threads 2a and 2b on the outer peripheral surface of the drum 5 increases to a certain degree, when the speed of the yarn guide 4 is prioritized to be constant, the switching circuit 28 switches the code conversion inside the switching unit 13. 1st in response to the signal from the circuit 29
Only the output of the command unit 11 is set to be valid. Therefore, only the output of the first command unit 11 is sent to the drive control unit 14 via the switching unit 13. At this time, the first command unit 11 converts the room pulse L and outputs a number of output pulses R corresponding to the winding amount necessary for inserting 5 picks in the selection period.
Is continuously output with a constant generation period over one repetition cycle. At this time, the total number of pulses required in one repeating cycle is represented by the following general formula.

R = p · T · i In this way, the first command unit 11 continuously outputs the output pulse R corresponding to the above-mentioned number of pulses during one repeating cycle, that is, regardless of the non-selection period or the selection period. Therefore, the drive control unit 14 drives the feed motor 8 at a constant speed over the non-selection period and the selection period, and executes speed-priority control. As a result, vibration does not occur and the winding tension is stabilized. By the way,
As a concrete example of the first command section 11, it suffices to adopt the known control circuit shown in the prior art of Japanese Patent Application No. 63-49275.

The winding amount (the number of picks) on the drum 5 continuously increases with a constant gradient over the non-selection period as shown in FIG. 3, and the winding amount corresponding to 3 picks before the first weft insertion. It is stored only for each picking 5 times during the subsequent selection period, and is gradually decreased by the amount corresponding to one pick, and finally becomes 0 at the end of one repeating cycle. By the way, the linear gradient of the winding amount corresponds to the rotation speed of the feed motor 8 and has an inclination of winding 5 picks in one repeating cycle.

Note that, in FIG. 3 and FIG. 4 described later, the horizontal axis represents one repetitive weft insertion cycle, that is, the non-selection period and the selection period, and the vertical axis represents the winding amount (pick number). The black triangle indicates the weft insertion operation on the one hand, for example, the weft thread 2a, and the white triangle indicates the other weft thread.
The weft insertion operation for 2b is shown. 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.

In the case of the speed-priority control method, the maximum value of the winding amount [the number of picks] is calculated by the following general formula.

In this embodiment, the maximum winding amount is 3 [pick number].
It is. If one repeating cycle is [ixj] = (10
When it is × 10), the maximum winding amount reaches 5.5 [number of picks]. When this causes a problem in the length measurement / storage operation, the next winding amount priority control is executed.

That is, even if the rotation speed of the feed motor 8 changes to some extent, rather, the weft thread on the drum 5 is rather changed.
When it is prioritized to reduce the winding amount of 2a and 2b, the switching circuit 28 in the switching unit 13 is a code conversion circuit.
In response to the signal from 29, the output from the first command unit 11 is invalidated and the output from the second command unit 12 is validated. Therefore, only the output of the second command unit 12 is sent to the drive control unit 14 via the switching unit 13. In this state, the selector 24 alternately generates a selection signal of “H” level or “L” level according to the selection period and the non-selection period, opens the AND circuit 26 during the selection period, and also selects the non-selection period. And circuit 27 is opened during the period. During the non-selection period, the pulse conversion circuit 17 and the frequency dividing circuit 20 are arranged so that the number of output pulses Rj corresponding to the weft insertion number α [the number of picks], for example, one pick.
Is generated and sent to the deviation counter 30. Here, the weft insertion number α is naturally set smaller than the inconvenient maximum winding amount value. Therefore, as shown in FIG. 4, the drive control unit 14 preliminarily winds the weft yarn 2a having a winding amount corresponding to one pick around the outer peripheral surface of the drum 5 during the non-selection period. After that, when the selection period starts, the pulse conversion circuit 16
The frequency divider circuit 19 converts the room pulse L to generate an output pulse Ri having a winding amount corresponding to the number of picks required in one repeating cycle, that is, the remaining four picks, thereby not selecting the feed motor 8. The weft yarn 2a having a winding amount necessary for continuous weft insertion five times is continuously measured and stored by rotating at a speed higher than the period. In this way, when controlled by the second command unit 12,
The feed motor 8 rotates at a low speed corresponding to the winding amount of 1 pick during the non-selection period, and increases the rotation speed in preparation for the winding amount of 4 picks during the subsequent selection period, which is required in one repeating cycle. The remaining four picks of weft yarn 2a are continuously stored. By the way, the total number of pulses required for the selection period and the non-selection period in one repeating cycle is represented by the following general formula, if it is preliminarily wound by the insertion number α [pick number] in the non-selection period. It

Ri = p · T · α Rj = p · T · (i−α) During the period in which the winding amount priority control is being performed, the weft thread 2a
Unlike the speed-priority control performed by the first command unit 11, the winding amount of does not increase more than necessary. This makes it possible to reliably prevent the threads from straddling each other. By the way, the second command unit 12 only needs to adopt the known control circuit shown in the prior art of Japanese Patent Application No. 63-161144.

In the above configuration, the switching unit 13 is the code conversion circuit.
At 29, either the output from the first command section 11 or the output from the second command section 12 is selected based on the preset selection signal.

On the other hand, according to the present invention, the selection signal is automatically output according to the repeating mode of the weft insertion set by the setters 22 and 23, that is, according to the values of the selected pick number i and the non-selected pick number j. It has characteristics. The following table shows the maximum winding amount in each combination when the selected pick number i and the non-selected pick number j can take values from 1 to 10 in the speed priority control method of the first command unit 11. The value [the number of picks] is obtained and shown from the above general formula. In the table, it is separated by a dotted line with the two picks of the winding amount as a boundary. For example, when the maximum value of the winding amount [the number of picks] in all combinations of the number of selected picks i and the number of unselected picks j when the second command unit 12 uses the winding amount priority control method is 2 picks or less. To do. At this time, even in the first control method, there are combinations of two or less picks, so the number of selected picks i and the number of unselected picks j are set.
Is a combination of the number i of selected picks and the number j of non-selected picks in which the maximum value of the winding amount is 2 picks or less in the first control method, the first control method is selected, and The second control method is selected when the combination is This makes it possible to reduce the winding amount in all combinations of the selected pick number i and the non-selected pick number j, and also to keep the winding speed constant when the first control method is selected. In order to realize such control, in the code conversion circuit 29,
For all combinations of the number i of selected picks and the number j of non-selected picks, for example, the control method of the first or second command units 11 and 12 to be selected with the dotted line in the table as a boundary is set in advance, A selection signal is output according to the values of the selected pick number i and the non-selected pick number j.

By the way, such switching control may be performed during weaving.

In FIG. 5, the weft insertion pattern in the case of free selection is read by the prefetch circuit 36 from the weft thread selection circuit 35, for example. Therefore, the switching unit 13 inputs the number i of selected picks and the number j of non-selected picks, which are changed at any time, with one repeating cycle as one unit, and the code conversion circuit 29 automatically selects the values according to these values. This is an example of selecting one of the controls. If such control is executed, it is possible to appropriately cope not only with the constant exchange but also with the freely inserting side insertion mode.

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
Assuming that one repeating cycle is set for b, 2c, and 2d as shown in FIG. 6, looking at one weft thread 2a, the other three weft threads 2b, 2c, and 2d are the non-selected pick number j. Correspond. From the above point of view, the above control can be performed in the same way for the other three colors of weft threads.
It can also be applied to multi-colored baskets.

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

EFFECTS OF THE INVENTION In the present invention, when storing multicolored weft yarns, either a control for keeping the winding speed constant or a control for reducing the storage amount on the drum as much as possible is performed depending on the type of weft yarns. Since it can be freely selected, appropriate storage control can be performed according to the nature of the weft.

When the maximum value of the winding amount in the first control method (constant speed priority) based on the first command unit is a predetermined value, for example, a combination of the number of selected picks and the number of non-selected picks that is 2 picks or less (one repetition mode), Select the first control method,
When the maximum winding amount is larger than the predetermined value, the second control method based on the second command unit (small winding amount priority) is selected. For the combination in which the first control method is selected, the winding speed can be made constant while the size can be reduced.

As a result, the occurrence of chattering can be prevented, the winding tension can be kept constant, and the thread traversing on the drum can be prevented in advance.

[Brief description of the drawings]

FIG. 1 is a schematic side view of the weft measuring and storing device, FIG. 2 is a block diagram of the measuring and storing control device, FIG. 3 and FIG.
FIG. 5 is a graph of changes in the winding amount (pick number), FIG. 5 is a block diagram of another embodiment, and FIG. 6 is an explanatory diagram of the four-color weft insertion order. 1 …… Weft measuring and storing device, 2a, 2b …… Weft, 8 ……
Feed motor, 9 ... Length measurement storage control device, 10 ... Encoder, 11 ... First command section, 12 ... Second command section, 13 ...
Switching unit, 14 ... Drive control unit, 15, 16, 17 ... Pulse conversion circuit, 18, 19, 20 ... Dividing circuit, 24 ... Selector, 28
...... Switching circuit, 30 …… Deviation counter, 31 …… Speed setter, 35 …… Weft selection circuit, 36 …… Prefetch circuit.

Claims (1)

(57) [Claims] 1. A multicolor weft yarn length measuring and storing device (1) for 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. The amount of winding when the feed motor (8) of the multicolor weft measuring and storing device (1) is continuously rotated at a constant speed over one repetitive cycle of weft insertion by the amount of rotation corresponding to the required number of windings. 1 for the 1st repeat cycle group of the first weft insertion corresponding to the combination of the number of selected picks and the number of non-selected picks in which the maximum value of
The first command unit (11) that continuously generates a number of command pulses corresponding to the winding amount required for the number of selected picks at a constant generation cycle over a repeated cycle, and the maximum value of the winding amount is greater than a predetermined value. With respect to the second repeating cycle group of the second weft insertion corresponding to the combination that also becomes large, the number of command pulses corresponding to the amount equal to or less than the predetermined value is generated during the period corresponding to the number of non-selected picks in one repeating cycle. And a second command section (12) for generating command pulses of a number corresponding to the remaining winding amount during the period corresponding to the number of selected picks, and the second command unit (12) according to the combination of the number of selected picks and the number of non-selected picks. 1. A switching unit (13) for selectively selecting a command pulse from the command unit (11) and a command pulse from the second command unit (12), and a command pulse output from the switching unit (13) Multicolor weft measuring and storage device according to Measuring and storing the control apparatus characterized by consisting of a drive control unit for rotating (14) the feed motor (8) of 1) (9).