JPH0431271Y2 - - Google Patents

Description

[Detailed description of the invention] Technical field of the invention The invention relates to a drum-type weft yarn feeding device.
In particular, it relates to means for controlling the amount of rotation of the rotating yarn guide.

Prior Art The applicant for utility model registration has already proposed an invention in Japanese Patent Application No. 105588/1988 as this type of winding amount control technology. In this invention, the amount of rotation of the main shaft of the loom is taken as an addition value, and the amount of rotation of a rotating yarn guide is taken as a subtraction value, and from the addition and subtraction of these values, a drive signal is given to a feed motor for driving the rotating yarn guide. The amount of winding of the weft thread is controlled at the top.

In such a control process, the number of pulse signals generated when the main shaft of the loom makes one revolution, and the number of pulse signals corresponding to the amount of rotation of the rotating yarn guide required during one revolution of the main shaft of the loom. , must be set equal to each other. The above invention is
As a solution to this problem, by interposing a frequency dividing circuit in the signal transmission path of the pulse signals, the number of pulse signals from the rotation amount of the loom and the number of pulse signals from the rotation amount of the feed motor for driving the rotating yarn guide are made equal. It is set so that Then, when the weaving width etc. is changed, that is, when the number of turns required for one pick is changed, by changing the above frequency division ratio, the number of pulses on the loom side and the number of pulses from the weft supply device can be adjusted. It's harmonizing.

For example, when the main shaft of the loom rotates once,
Assuming that the shaft encoder generates the number of pulses P ₁ , the number of turns per pick of the feed motor is n, the number of pulses per rotation of the feed motor is P ₂ , and the frequency division ratio is N, the control system will be as follows. The settings must be made so that the formula holds true.

P ₁ /N=P ₂ ×n This can be transformed and expressed as follows.

P ₁ /n=P ₂ ×N In the above formula, P ₁ , P ₂ , N, and n are all natural numbers, so P ₁ /n is also a natural number. now,
Assuming that the number of pulses P ₂ is ``4'' and the number of turns n is ``2'' to ``8'', the number of pulses P ₁ that can be applied to all cases is determined. At least the following conditions must be met. Must be.

P ₁ = [least common multiple of 2, 3, 4, 5, 6, 7, 8] x 4 = 3360 As described above, according to the pulse signal frequency dividing means, at least 3360
A shaft encoder that generates the number of pulses is required. This is usually higher than the resolution of a general-purpose shaft encoder used to control a loom, and is disadvantageous in terms of high-speed operation of the loom and the cost of the control system.

In addition, as another countermeasure, it is possible to change the weaving width by replacing the shaft encoder itself on the loom side. However, such a solution is not a practically effective solution because it requires a lot of time to mechanically change the shaft encoder and requires various shaft encoders.

Purpose of the invention Therefore, the purpose of the present invention is to change the weaving width, that is, the number of turns per pick, without increasing the number of pulses per revolution of the shaft encoder on the main shaft side of the loom, and without increasing the number of pulses per rotation of the shaft encoder on the main shaft side of the loom. The goal is to make it easy to deal with this by using standard setting means.

Solution to the Invention Therefore, in the present invention, instead of the conventional frequency divider, a signal converter is interposed on the first shaft encoder side on the main shaft side of the loom. This signal converter is
The pulse signal from the first shaft encoder is converted into a plurality of patterns of pulse signals corresponding to the horizontal insertion state, and only one necessary pulse signal among them is outputted to the arithmetic storage. Here, the state of weft insertion refers to the state of weaving width or interlaced weft insertion of multiple colors.

In a preferred embodiment, the converter is constituted by a ROM, and the period of the pulse signal can be freely set using the minimum resolution of the first shaft encoder as the minimum unit. Therefore, when changing the weaving width, that is, changing the number of turns required for one pick,
This can be easily handled by selecting and setting the output signal of the signal converter, and even if the number of pulses generated per revolution of the shaft encoder is relatively small, it can be handled satisfactorily.

Structure of the Invention First, FIG. 1 shows the winding amount control device 2 in relation to the mechanical components of the weft yarn feeding device 1 of the invention.

In the weft supply device 1, the weft 3 is
Supplied by a yarn feeder 4 and rotating yarn guide 5
It passes through the inside of the drum 6 and is wound around the outer periphery of the length measurement storage drum 6 by its rotational movement. A rotational drive source for this rotating yarn guide 5 is provided by a feed motor 7 that is controlled by the winding amount control device 2.

During the length measurement operation, the weft thread 3 is locked on the outer peripheral surface of the drum 6 by a locking pin 8. This locking pin 8 is provided so as to be able to move forward and backward toward the outer circumferential surface of the drum 6, and when moved backward by an electromagnetic solenoid 9 during weft insertion, the retained weft thread 3 is moved toward the outer circumferential surface of the drum 6. Unwrap. At this time, the unwound weft yarn 3 is wefted into the warp opening along with the jetting fluid by the weft insertion nozzle 10. Of course, the locking pin 8
The forward and backward movement of the nozzle 10 and the jetting operation of the nozzle 10 are performed in synchronization with the rotation of the loom.

The winding amount control device 2 includes a drive control section 1
1, and a command control section 12, which is a characteristic feature of the present invention.

The command control unit 12 includes a first shaft encoder 13 in order to convert the rotation of the main shaft 14 of the loom into a pulse signal A, and also includes a first shaft encoder 13 in order to convert the rotation of the rotating yarn guide 5 into a pulse signal B.
A second shaft encoder 15 is provided. The first shaft encoder 13 is, for example, an absolute type, and is connected to an up input terminal of an arithmetic storage unit 17 via a signal converter 16. Further, the second shaft encoder 15
is connected to the down input terminal of the arithmetic storage unit 17. This arithmetic storage unit 17 is composed of, for example, an up-down counter, and has a D-A converter 18 and a summation point 19 on its output side.
It is connected to the input end side of the drive control section 11 through the. Note that the second shaft encoder 1
5 is connected to the summing point 19 as well as the reference speed setter 24 via the F-V converter 20.

As shown in FIG. 2, the signal converter 16 includes a conversion circuit 21 connected to the first shaft encoder 13, a selection circuit 22 connected to the output side of this conversion circuit 21, and a selection circuit 22 connected to the output side of this conversion circuit 21. It is constituted by a setting circuit 23 connected to a circuit 22.

Here, the conversion circuit 21 is constituted by a programmable memory element, such as an 8-bit ROM, or by a logic circuit, and receives an 8-bit pulse signal A from the first shaft encoder 13 as input. According to the generation pattern, eight types of pulse signals a ₀ , a _{1 .} . . a ₇ with duty ratios necessary for winding amount control are generated. This output pattern can be freely set in units of the minimum resolution of the first shaft encoder 13 when writing program data in the ROM. The output of these pulse signals a ₀ , a ₁ ... a ₇ is, for example,
As shown in FIG. 3, during one rotation of the main shaft 14, "H" level pulses are applied at 1, 8, 12, 16,
Only 20, 24, 28, and 32 have occurred. Further, the selection circuit 22 is constituted by, for example, a multiplexer.

Function of the device As already described, the weft yarn feeding device 1 has the following functions.
Due to the rotational movement of the rotating yarn guide 5, the weft yarn 3
is wound around the outer periphery of the drum 6, its length is measured, and is stored until the time of weft insertion by the nozzle 10. At the time of weft insertion, when the stored weft yarn 3 is unwound by the locking pin 8, the nozzle 10 wefts the unwound weft yarn 3 into a warp opening (not shown) together with the pressure fluid.

Now, when the main shaft 14 of the loom rotates, the first shaft encoder 13 generates a corresponding digital pulse signal A, and the signal converter 16
is being sent to. Therefore, the signal converter 16 receives the pulse signal A and generates a plurality of pulse signals a ₀ , a ₁ , . . . a ₇ corresponding to the rotation angle of the main shaft 14. These pulse signals a ₀ , a ₁ ... a ₇ are the third
As shown in the figure, each signal changes in a predetermined pattern every rotation of the main shaft 14, and these signal change patterns and mutual phase functions can be freely set, and once set, they do not change. .

On the other hand, the rotation of the rotating yarn guide 5 is detected by the second shaft encoder 15,
It is sent to the down input terminal of the arithmetic storage unit 17.

Here, 4 turns of weft thread 3 for 1 pick weft inserter.
is required, and if the second shaft encoder 15 generates, for example, four pulse signals B per revolution of the rotating yarn guide 5, the number of pulses required to measure the length of one pick is 16"
becomes. At this time, the selection circuit 22 selects the setting circuit 2.
3, the fourth pulse signal a ₃ is selected among the eight types of pulse signals a ₀ , a ₁ ... a ₇ as the output of the conversion circuit 21, and only it is stored in the arithmetic memory 17. It is output to the up input terminal. This pulse signal _a3 generates 16 "H" level pulses during one rotation of the main shaft 14. For this reason,
As the main shaft 14 of the loom rotates, the calculation memory 17
The main shaft ₁ is connected to the up input terminal of the
The value of the number of pulses "16" is inputted sequentially for each rotation of 4. The counted value of the calculation memory 17 becomes the speed command dimension C, which is converted into an analog speed command signal D by the DA converter 18, and then passed through the addition point 19 to the input terminal of the drive control section 11. sent to. As a result, the drive control section 11 drives the feed motor 7 with a drive signal E having a voltage value proportional to the speed command signal D.

In this embodiment, a reference speed setter 24 is provided. The reference speed setter 24 always rotates the feed motor 7 at a predetermined speed by applying a voltage corresponding to the reference rotation speed to the feed motor 7. Therefore, as shown in FIG. 4, the command control section 12 controls only the amount corresponding to the excess or deficiency of the reference speed, and performs corrective control based on a small control amount. This is effective in improving the response at the start of operation.

The rotation of the rotating yarn guide 5 at this time is
The number of pulses is "16" per four rotations of the rotating yarn guide 5.
are sequentially sent to the down input terminal of the arithmetic storage unit 17 as pulse signals B. As a result, the speed command signal C gradually becomes "0", so the analog speed command signal D similarly becomes "0".

Conversely, the down input of the arithmetic storage unit 17 exceeds the up input, and the count value of the arithmetic storage unit 17, that is,
When the speed command signal C becomes a negative value, the DA converter 18 applies a negative speed command signal D to the summing point 19.

During this period, the rotational speed of the feed motor 7 is detected as a pulse signal B by the second shaft encoder 15, and is converted by the F-V converter 20 into a feedback signal F with a voltage proportional to the pulse train. Negative feedback is provided from the matching point 19 to the drive control section 11 . This feedback signal F
constitutes a speed feedback control system,
This is effective in increasing the response speed of the feed motor 7 and preventing excessive control.

In this way, each time the loom rotates, the feed motor 7 measures and stores the required number of turns of the weft yarn 3 on the drum 6 until the next weft insertion. In this way, the winding amount control device 2
follows the rotation of the loom and controls the amount of rotation of the feed motor 7. This control form is a type of tracking control.

By the way, when the weaving width is changed to a wider width and the number of turns required for wefting one pick increases, the pulse signal a containing more pulses during one rotation of the main shaft 14 than the pulse signal _a3 is correspondingly increased. _Four ,
Changed to either a ₅ , a ₆ , or a ₇ . As is already clear, such a change can be made by a simple electrical operation by operating the setting circuit 23 and selecting one of the pulse signals a ₄ , a ₅ , a ₆ , and a ₇ . I can handle it. Moreover, when the weaving width is changed to a smaller direction, or when this weft thread feeding device 1 is used for multi-colored interlaced weft insertion, correspondingly, fewer pulses are generated during one rotation of the main shaft 14. The pulse signal is switched to one of the pulse signals a ₀ , a ₁ , and a ₂ including the following.

As already mentioned, the conversion circuit 21 of this embodiment
is 8 bits and generates 8 types of pulse signals, but all of these pulse signals
When a ₀ , a ₁ . . . a ₇ do not correspond to the corresponding weaving width or interlace weaving, another conversion circuit 21 is prepared and replaced. This makes it possible to respond flexibly to all types of horizontal loading conditions.

Of course, if these conversion circuits 21 are constructed as, for example, 16 bits, they can correspond to 16 types of weft insertion states. Further, the first shaft encoder 13 may also serve as a shaft encoder for controlling a loom. In the above embodiment, the pulse signal _a0 , which outputs one pulse per rotation of the main shaft 14, is used as a signal for synchronous control of the loom.

Further, in the above embodiment, the first shaft encoder 13 may be of an incremental type that can determine the origin. At this time, as shown in FIG. 5, the pulse signal from the shaft encoder 13 is counted by the counter 13a, and an 8-bit pulse signal A corresponding to the angle value is generated. In addition,
The count value (pulse signal A) of the counter 13a is cleared by the origin signal generated every rotation of the main shaft 14.

Effects of the invention The invention provides the following unique effects.

The signal converter allows multiple patterns of pulse signals to be obtained in the minimum resolution unit of the first shaft encoder, so when the weaving width is changed or multi-color weft insertion is performed, the main shaft rotates once. Even when the amount of rotation of the rotating yarn guide required for the rotation changes, the first shaft encoder can be easily adjusted by simply switching the electrical settings.

Furthermore, since the output state of the signal converter can be freely set in advance using the minimum resolution of the first shaft encoder as one unit, the number of pulses generated by the first shaft encoder can be relatively small, and therefore the expensive A high-resolution shaft encoder is not required, and therefore the absolute encoder for detecting the angle of the loom is used as it is as the first shaft encoder.

In addition, when a programmable memory element is used as the main element of a signal converter, the output pattern of the pulse signal can be set freely, and by replacing the memory element, it is possible to make changes over a wider range of flexibility. This makes it possible to take appropriate measures.

[Brief explanation of drawings]

Fig. 1 is a block diagram of the weft supply device and winding amount control device, Fig. 2 is a block diagram of the signal converter, Fig. 3 is a signal waveform diagram of the pulse signal, Fig. 4 is a speed characteristic diagram, and Fig. 5 is a block diagram of the weft yarn supply device and winding amount control device. The figure is a block diagram when the first shaft encoder is of an incremental type. 1... Weft supply device, 2... Winding amount control device,
3... Weft, 5... Rotating yarn guide, 6...
drum, 7... feed motor, 8... locking pin, 11... drive control section, 12... command control section,
13...First shaft encoder, 14...Main shaft, 15...Second shaft encoder, 16...
...Signal converter, 17... Arithmetic storage device, 18...D
-A converter, 19...addition point, 20...F-
V converter, 21... conversion circuit, 22... selection circuit, 23... setting circuit.

Claims (1)

[Scope of Claim for Utility Model Registration] A weft yarn feeding device that winds the weft yarn around the outer periphery of a stationary drum, measures the length, and stores the weft yarn until it is time to insert the weft yarn by the rotational movement of a rotating yarn guide driven by a feed motor, the above-mentioned feed motor and a command control part that generates a speed command signal from the relationship between the rotation of the main shaft of the loom and the rotation of the feed motor and outputs it to the drive control part. , a first shaft encoder that converts the rotation of the main shaft of the loom into a pulse signal, a second shaft encoder that converts the rotation of the rotating yarn guide into a pulse signal, and a second shaft encoder that converts the rotation of the main shaft of the loom into a pulse signal; a signal converter that converts into a plurality of patterns of pulse signals corresponding to the input state and selectively outputs one of the pulse signals; the pulse signal from this signal converter is used as an addition value; an arithmetic storage device that inputs the pulse signal from the encoder as a subtraction value and generates a digital speed command signal based on the difference; and converts the speed command signal into an analog speed command signal and applies it to the drive control section. D-
A converter, the signal converter includes a ROM that converts the pulse signal from the first shaft encoder into a plurality of patterns of pulse signals necessary for winding amount control, and a ROM that converts the pulse signal from the first shaft encoder into a plurality of patterns of pulse signals necessary for winding amount control; 1. A winding amount control device for a weft yarn supply device, comprising a signal selection circuit that selectively selects one signal, and a setting circuit that sets the signal selection state.