JPH0268334A - Controller for length measuring and storage - Google Patents

Abstract

PURPOSE:To prevent yarns from kinking and entangling on a drum by alternatively selecting command pulses outputted from the first command part for controlling a winding speed according to the kind of weft yarns and the second command part for minimizing and controlling the amount stored in the drum. CONSTITUTION:The first command part for continuously outputting command pulses corresponding to the amount of a package required for the number of selected weft yarn picks corresponding selected picks during one repeated cycle of picking over a nonselective and selective periods with a prescribed period and controlling the weft yarn winding speed constant is arranged in storing multicolor weft yarns. Furthermore, the second command part for issuing command pulses corresponding to a small amount in that of package required for the number of selected picks during the nonselective period of the corresponding weft yarns in one repeated cycle of picking, outputting command pulses corresponding to the amount of residual package during the selective period and minimizing the amount of stored weft yarns on a drum is provided. A changeover part for alternatively selecting the command pulses outputted from the afore-mentioned first and second command parts is further installed.

Description

TECHNICAL FIELD OF THE INVENTION The present invention relates to a multicolor weft yarn length measurement and storage device, and more particularly to a control device for its feed motor.

A conventional drum-type weft yarn length measuring and storage device winds the weft yarn around the outer periphery of the drum, measures the length, and stores it until the weft is inserted, by means of relative rotational movement between the drum and the yarn guide. When the drive source for this rotational movement is a feed motor, the rotational movement of the feed motor requires synchronous control in relation to the lateral movement.

By the way, in a type in which the feed motor rotates only during the weft selection period, the feed motor stops during the weft non-selection period. Therefore, the control format of the feed motor is 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, making the length measurement storage operation unstable.

Therefore, the specification of JP-A No. 60-28551 shows that the feed motor is not stopped during one repeat cycle of weft insertion, but is rotated continuously at a constant average speed. According to this technology, the feed motor rotates continuously at a constant speed even during the non-selection period of the weft thread, eliminating the need for frequent on-off control as described above. When the number increases, the amount of weft yarn stored on the drum increases, and with some types of weft yarns, adjacent yarns tread on each other, making weft insertion unstable.

On the other hand, JP-A-58-31145, JP-A-595374
No. 3, JP-A No. 61-194255, etc., the amount of weft yarn stored on the drum is determined by storing only a small amount of weft yarn on the drum during the non-selection period, and then increasing the amount of weft yarn stored on the drum during the subsequent selection period. The amount can be reduced by continuously storing enough weft yarn to fit in the weft. However, in this case, since the rotational speed of the feed motor is switched during one repeat cycle of weft insertion, an adverse effect is likely to occur depending on the type of weft yarn, similar to the above-described on-off control type.

From this background, the rotational movement of the feed motor of the weft yarn length measuring and storage device is a matter that should be set appropriately depending on the type of weft yarn.

OBJECT OF THE INVENTION Accordingly, an object of the present invention is to set the rotational motion of the feed motor to an appropriate state depending on the type of weft yarn, while taking into consideration the weft insertion mode of one repeat cycle of weft insertion.

Solution to the Invention Therefore, in continuously rotating the feed motor of the weft length measuring and storage device, the present invention provides a speed priority system in which the feed motor is continuously rotated at an average constant speed during one repeat cycle of weft insertion. control method and horizontal insertion 1
A winding amount-prioritizing control system is provided in which the feed motor is rotated at low speed during the weft non-selection period in the repeat cycle, and at high speed during the selection period, and the feed motor is rotated at low speed during the weft non-selection period and at high speed during the selection period. , the above-mentioned drawbacks of the prior art are solved by selectively selecting these control methods.

The switching of such a control method may be set in advance before the start of weaving, or may be automatically switched during weaving while anticipating the repeat mode of weft insertion. In addition,
This control method uses judgment criteria such as whether to reduce the amount of preliminary winding of the weft yarn on the drum, or whether to change the winding speed of the weft yarn around the drum as much as possible. Determined by considering physical properties, etc.

Structure of the Invention First, FIG. 1 shows the structure of a two-color weft length measuring and storage 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 them on the outer circumferential surface of a stationary length measurement and storage drum 5 by the rotational movement of a rotary yarn guide 4. The length is measured by winding it while being locked with the pin 6, and it is stored until the time of width insertion. When, for example, the weft 2a is selected among the stored weft threads 2a and 2b, the corresponding locking pin 6 moves back at the weft insertion timing, so that the weft thread 2a is removed by the weft insertion nozzle 7 while the warp is not opened. It is put aside. This weft insertion order is preset within one repeat cycle of weft insertion as a constant exchange.

Since each weft yarn length measurement and storage device 1 is electrically operated, each yarn guide 4 is connected to a dedicated feed motor 8 and controlled by a length measurement and storage 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, a first command unit 1, and
1, a second command section 12, a switching section 13, and a drive control section 14.

The first command unit 11 and the second command unit 12 are connected to the encoder 1
0 and the switching unit 13, pulse converter circuits 15, 16, 17 and frequency divider circuits 18, 19, .
20. These pulse conversion circuits 15, 16, and 17 are used to set the number of turns T (number of turns/1 pick) required for one pick weft insertion, and to set the number i of selected picks during one repeat cycle of weft insertion. frequency divider circuit 18, 19, 20.
is connected to the setter 22 and the setter 23 for the number j of non-selected picks in one repeat cycle.

Further, the switching unit 13 includes a selector 24, a knot circuit 25, two AND circuits 26, 27, and a switching circuit 28 between the first command unit 11, the second command unit 12, and the drive control unit 14, The output of the first command section 11 or the two outputs of the second command section 12 are alternately selected and sent to the drive control section 14. Note that the setting devices 22 and 23 are also connected to the switching circuit 28 through the code conversion circuit 29.

Further, the drive control unit 14 internally includes a deviation counter 30 and a speed setter 31, which are connected to a drive circuit 34 via a summing point 33, and are connected to the feed motor 8 to be controlled. . Note that this rotation of the feed motor 8 is detected by the pulse generator 32 and fed back to the down input terminal of the deviation counter 30.

Effect of the Invention During weaving operation, the rotation of the main shaft of the loom is controlled by the encoder 10 according to a pulse train for rotation command, that is, a room pulse L.
(number of pulses/m machine rotation), and the pulse conversion circuits 15 and 16 of the first command section 11 and the second command section 12
．． 17.

These pulse conversion circuits 15, 16, and 17 convert the room pulse L into a predetermined pulse train based on the number of turns T required for one pick weft insertion and the number i of selected picks during one repeat cycle of weft insertion. , to the respective frequency divider circuits 18, 19, and 20. Here, each frequency dividing circuit 18, 19, 20 changes the frequency division ratio based on the number j of non-selected picks, and according to this frequency division ratio, output pulses R, Ri, Rj is generated. These output pulses RXRi, Rj (number of pulses/one revolution of the loom) are selectively selected by the switching unit 13 according to the weft insertion mode during one repeat cycle of weft insertion,
It becomes an input to the drive control section 14. If the switching circuit 28 is set by the code conversion circuit 29 to enable only the output of the first command section 11, the output pulse R is directly sent to the amplifier input terminal of the deviation counter 30. Further, the switching circuit 28 is switched to the second
When only the two outputs of the command unit 12 are set to be valid, the output pulses Ri and Rj of the frequency dividing circuits 19 and 20 are set to the "H" level from the selector 24 or "
The deviation counter 30 selectively responds to the L” level signal.
It will be sent to the amplifier input terminal.

Therefore, the deviation counter 30 inputs the output pulse R or the output pulses R4, Rj at the up input terminal, and inputs the rotation speed of the feed motor 8, that is, the feed pack pulse p [number of pulses/feed] from the pulse generator 32 at the down input terminal. One revolution of the motor] is used as a down input, and an analog signal proportional to the deviation Δ [number of pulses] is applied to the summing point 33. As a result, the drive circuit 3
In addition to the constant basic speed signal from the speed setter 31, 4 generates an analog drive output by inputting a signal for variation due to the deviation Δ, and thereby rotates the drive motor 8 at a predetermined speed. , to follow the rotation of the loom. In this way, the necessary amount of winding of the weft yarn 2a around the outer circumference of the drum 5,
2b is stored, the deviation Δ of the deviation counter 13 becomes "0", so the feed motor 8 continues to rotate only at the basic speed given by the speed setter 16.

Now, one repeat cycle of horizontal insertion is (i x j) =
(5×5), and assume that the two weft yarns 2a and 2b are alternately wefted by 5 picks each.

Even if the amount of winding of the weft yarns 2a and 2b increases to a certain extent on the outer peripheral surface of the drum 5, when keeping the speed of the yarn guide 4 constant is a priority, the switching circuit 28 performs code conversion within the switching section 13. In response to a signal from the circuit 29, only the output of the first command section 11 is set to be valid. Therefore, only the output of the first command section 11 is sent to the drive control section 14 via the switching section 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 amount of winding required for horizontal insertion of 5 picks in the selected period at a constant generation period over one repetition cycle. It outputs continuously. At this time, the total number of pulses required during one repetition cycle is expressed 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 repeat cycle, that is, regardless of the non-selection period or the selection period. (Thus, the drive control unit 14 drives the feed motor 8 at a constant speed during the non-selection period and the selection period,
Perform speed-prioritized control. As a result, the occurrence of burrs is eliminated, and the tension in the winding is also stabilized. By the way, a specific example of the first command unit 11 is disclosed in Japanese Patent Application No. 63-49275.
It is sufficient to employ the known control circuit shown in the prior art of No.

As shown in FIG. 3, the winding amount (number of picks) on the drum 5 continuously increases at a constant gradient over the non-selection period.
The amount of rolls equivalent to 3 picks is stored before the first weft insertion, and after that, every 5 times during the selection period,
It decreases little by little by an amount corresponding to one pick, and finally reaches O at the end of one repeat cycle. Incidentally, the slope of the straight line of the amount of winding corresponds to the rotational speed of the feed motor 8, and is such that the winding amount is 5 times per cycle.

In FIG. 3 and FIG. 4, which will be described later, the horizontal axis represents one repetition cycle of weft insertion, that is, the non-selected period and the selected period, and the vertical axis represents the winding amount (number of picks).

The black triangle mark indicates the weft insertion operation for one, for example, the weft thread 2a, and the white triangle mark indicates the weft insertion operation for the other weft thread 2a.
It shows the horizontal inserting operation for b. Although this wefting is actually performed over a predetermined period of time, in these figures, the wefting operation is simply shown as being completed instantaneously.

In the case of the speed-priority control method, the maximum winding amount "number of picks" is determined by the following general formula.

In this example, the maximum value of the winding amount is 3 (number of picks)
It is. If the ■repetition cycle is (iXj) = (
10xlO), the maximum winding amount reaches 5.5 [number of picks]. If this causes a problem in the length measurement/storage operation, the next winding amount priority control is executed.

That is, even if the rotational speed of the feed motor 8 changes to some extent, the weft thread 2 on the drum 5 would rather
When priority is given to reducing the winding amounts of a and 2b, the switching circuit 28 in the switching section 13 receives a signal from the code conversion circuit 29 and disables the output from the first command section 11. , the output from the second command unit 12 is set to be valid. Therefore, only the output of the second command section 12 is sent to the drive control section 14 via the switching section 13. In this state, the selector 24 alternately generates a selection signal of "H" level or "L" level depending on the selection period and the non-selection period, opens the AND circuit 26 during the selection period, and also opens the AND circuit 26 during the selection period. AND circuit 27 is opened during this period. During the non-selection period, the pulse converter circuit 17 and the frequency divider circuit 20 generate output pulses Rj corresponding to the winding number α (pick number), for example, 1 bit, and send them to the deviation counter 30. I'm here. Here, the horizontal number α
is naturally set smaller than the disadvantageous maximum winding amount. For this reason, the drive control section 14, as shown in FIG.
During the non-selection period, the weft yarn 2a is preliminarily wound around the outer peripheral surface of the drum 5 in an amount corresponding to one pick. after that,
When entering the selection period, the pulse conversion circuit 16 and the frequency division circuit 19 convert the room pulse L to
■The number of picks required in the repeat cycle, i.e. the remaining 4
By generating an output pulse Ri with a winding amount corresponding to the width, the feed motor 8 is rotated at a higher speed than during the non-selection period, and the weft yarn 2a is continuously fed with the winding amount necessary for five consecutive weft insertions. The length is measured and stored. 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 one pick during the non-selection period, and rotates at a low speed corresponding to the winding amount of one pick during the subsequent selection period. The rotational speed is increased in preparation for the amount of winding, and the remaining four picks of weft yarn 2a required for one repeat cycle are continuously stored. By the way, ■The total number of pulses required for the selection period and non-selection period in the repeat cycle is expressed by the following general formula, assuming that the number of picks α (number of picks) is preliminarily wound in the non-selection period. Ru.

Ri=p-T・α Rj=p-T・(i-α) During the period when this winding amount priority control is performed, the weft yarn 2a
Unlike the speed-priority control performed by the first command unit 11, the amount of winding does not become larger than necessary. This makes it possible to reliably prevent the threads from stepping on each other. By the way, this second command unit 12 is based on patent application No. 161144/1986.
It is sufficient to employ the known control circuit shown in No. 2 prior art.

Other Embodiments In the above embodiments, the switching unit 13 selects either the output from the first command unit 11 or the output from the second command unit 12 based on the selection signal set in advance by the code conversion circuit 29. is selected. However, this selection signal can also be automatically output in accordance with the repetition mode of weft insertion set by the setting devices 22 and 23, that is, the values of the number of selected picks i and the number of non-selected picks j.

The following table shows that in the speed-priority control method of the first command unit 11, the number i of selected picks and the number j of non-selected picks are each 1.
The maximum value of the winding amount (number of picks) for each combination is calculated from the above general formula and is shown, assuming that the value can be from 1 to 10. In the table, the two picks of volume are separated by dotted lines. For example, the second command unit 1
Number of selected picks l when using the control method that prioritizes the winding amount in 2.
It is assumed that the maximum value of the winding amount [number of picks] in all combinations of and the number of non-selected picks j is 2 picks or less. At this time, since there are combinations in which the number of picks is 2 or less in the first control method, the set number of selected picks i and the number of non-selected picks j are set to the maximum value of the winding amount in the first control method. The number of selected picks i such that is less than or equal to 2 picks
When the number of unselected picks j is a combination, the first control method is selected, and when the combination is larger than 2 picks, the second control method is selected. In this way, the amount of winding can be reduced for all combinations of the number i of selected picks and the number j of non-selected picks, and when the first control method is selected, the winding speed can also be kept constant. can. In order to realize such control, the code conversion circuit 29 converts, for example, the first or second to be selected with the dotted line in the table as the boundary for all combinations of the number of selected picks 1 and the number of non-selected picks j. Command unit 11.
Twelve control methods are set in advance, and a selection signal is output according to the input values of the number j of selected picks and the number j of non-selected picks.

Incidentally, such switching control may be performed during weaving.

In FIG. 5, the weft insertion pattern in the case of free selection is read, for example, from the weft selection circuit 35 by a look-ahead circuit 36. Therefore, the switching unit 13 inputs the number i of selected picks and the number j of non-selected picks, which are changed from time to time, with one repetition cycle as one unit, and the code conversion circuit 29 automatically changes the number i of selected picks and the number j of non-selected picks according to these values. This is an example of selecting one of the controls. If such control is executed, it is possible to appropriately deal with not only fixed exchange but also free exchange and horizontal insertion mode.

Further, in the above embodiments, only two-color exchange is explained as an example. However, the invention is equally applicable to multicolor exchanges. That is, for example, four colored weft threads 2a, 2
Assuming that one repeat cycle is set as shown in Fig. 6 for b, 2c, and 2d, looking at one weft thread 2a, the other three weft threads 2b and 2C12d correspond to the non-selected pick number j. . Since the same view can be applied to the other three colors of weft threads, the above control can also be applied to multi-colored weft inserts from the above viewpoint.

Furthermore, the weft yarn length measurement and storage device may be of a drum rotating type. In the case of a drum rotating type device, the feed motor 8 drives the drum.

Effects of the Invention In the present invention, when storing multicolored weft yarns, depending on the type of weft yarn, the winding is controlled to either keep the speed constant or to reduce the amount stored on the drum as much as possible. can be freely selected, allowing for appropriate storage control depending on the properties of the weft yarn.

This makes it possible to prevent the occurrence of burrs, keep the tension constant during winding, and prevent the threads from stepping on each other on the drum.

[Brief explanation of the drawing]

Fig. 1 is a schematic side view of the weft yarn length measurement and storage device, Fig. 2 is a block diagram of the length measurement and storage control device, and Figs.
The figure is a graph of changes in winding amount (number of picks), FIG. 5 is a block diagram of another embodiment, and FIG. 6 is an explanatory diagram of the order of horizontal insertion of four colors. Engineering: Weft length measuring and storage 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 section, 14.. Drive control section, 15.
16.17...Pulse conversion circuit, 18.19.20...
Frequency dividing circuit, 24...Selector, 28...Switching circuit, 3
0...Deviation counter, 31...Speed setter, 35...Weft selection circuit, 36...Look-ahead circuit. Figure 7 - Messenger 1l11 (Shikihe Town-J)lll1l [”, uhehene]

Claims (2)

[Claims] (1) One repeat cycle of weft insertion in a multicolor weft length measuring and storage device (1) that measures and stores each weft yarn by relative rotational movement between a drum and a yarn guide for each of a plurality of weft yarns. 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 of the corresponding weft yarn at a constant generation cycle over the non-selection period and the selection period; Generating a number of command pulses corresponding to a small amount of the winding amount required for the selected number of picks during a non-selection period of the corresponding weft yarn during one repeat cycle of weft insertion,
and a second command section (12) that generates a number of command pulses corresponding to the remaining winding amount during the selection period, and a command pulse from the first command section (11) and the above according to the repetition mode of weft insertion. A switching unit 13 that selectively selects a command pulse from a second command unit (12); and this switching unit (13).
A length measurement storage control device (9) comprising a drive control section (14) that rotates a feed motor (8) of a multicolor weft length measurement storage device (1) in accordance with command pulses output from the multicolor weft yarn length measurement storage device (1). . (2) One repeat cycle of weft insertion in a multicolored weft length measuring and storage device (1) that measures and stores each weft yarn by relative rotational movement between a drum and a yarn guide for each of a plurality of weft yarns. 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 of the corresponding weft yarn at a constant generation cycle over the non-selection period and the selection period; Generating a number of command pulses corresponding to a small amount of the winding amount required for the selected number of picks during a non-selection period of the corresponding weft yarn during one repeat cycle of weft insertion,
and a second command section (12) that generates a number of command pulses corresponding to the remaining winding amount during the selection period, and a command pulse from the first command section (11) and the above according to the repetition mode of weft insertion. A switching unit (13) that selectively selects the command pulse from the second command unit (12);
3) a drive control unit (14) that rotates the feed motor (8) of the multicolor weft length measuring and storage device (1) in accordance with command pulses output from A length measurement storage control device (9) comprising a look-ahead circuit (36) that sends a switching signal to the switching section (13).