JPS5841939A - Method and apparatus for measuring length of weft yarn in fluid jet type 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 The present invention relates to a weft side L (method and apparatus) in a fluid jet loom V.

Fluid injection area 1! ! In this case, after the weft insertion is completed and until the next weft insertion, strictly speaking, between the time when the next weft insertion is completed and the next weft insertion is completed, H1jl of weft threads of the length required for the next weft insertion are stored. During weft insertion, these weft yarns are caused to fly to the other side of the reed by a main nozzle provided on one side of the reed. As devices for measuring the length of yarn, there are two types: one in which the length measuring roller is pressed against the drive opening of this roller, and the yarn is sent out between the two, and the other is in pressure contact with the +ix driving roller. There is a so-called Nelson roller system that uses a length measuring roller and a guide. As a storage device, there are two types: a drum type in which the liquid is wrapped around a drum, and a pool pipe type in which the liquid is carried on an air stream.

These length measuring devices rotate continuously to continue supplying yarn to the storage section.

By the way, if the width of the fabric to be woven changes (then, of course, it is necessary to change the length of the yarn and the amount of storage).

For this reason, when changing the amount of length measurement, it is generally necessary to have a large number of drive rollers with different diameters, and when the width of the woven fabric changes, use one with an appropriate diameter, or change the diameter of the yarn storage drum. By configuring it so that it is possible to weave woven fabrics of different widths.

However, when drive rollers with different diameters are used, it is necessary to store a large number of these parts, and the number of these parts is necessarily limited, so the diameter cannot be changed steplessly.

On the other hand, even if the width to be woven is the same, the length of the weft inserted usually differs for each weft insertion due to slipping of the yarn on the yarn storage drum or uneven tension of the yarn. The length also changes with each weft insertion. If the selvage length is longer than specified, a larger amount of weft yarn than specified will be required when manufacturing the woven fabric, and this will accumulate, resulting in wasted yarn. The same can be said for the storage pipe method.

This invention was made in view of the above-mentioned circumstances, and there is no need to provide a large number of parts even when the weaving width changes, and there is no need for complicated procedures such as when changing the diameter of the yarn storage drum. Furthermore, it is an object of the present invention to provide a weft length measuring method and apparatus that can perform weft insertion with an optimal length measurement amount of weft yarns and can prevent wasteful consumption of yarn during weaving.

That is, the present invention changes the rotational speed of the yarn storage drum according to the weaving width, detects the length of the weft at each weft insertion, and adjusts the rotational speed appropriately so that the length becomes a specified length. The gist is to do so.

The present invention will be described in detail below using embodiments shown in the accompanying drawings.

In FIG. 1, the motor 1 is a DC motor, and its drive 'fllla' is connected to the rotating shaft of the yarn storage drum 2. A length measuring roller 6 is pressed against the outer peripheral surface of the yarn storage drum 2, and the length measuring roller 6 is driven by the rotation of the yarn storage drum 2. Yarn from a yarn supplying body 5 is supplied to the yarn storage drum 2 via a yarn guide 4, and the yarn Y is wound around the yarn storage drum 2 as the yarn storage drum 2 and length measuring roller 3 rotate. be done.

Also, the front end of the yarn pulled out from the yarn supplying body 5 is the yarn 7 Jj
It reaches the main nozzle via the id 6 and clamper 7. Then, when the timing for weft insertion comes, the clamper 7 opens and the main nozzle 8 also starts to eject fluid, and the yarn wound around the yarn storage drum 2 is flown from the main nozzle 8, passes through the warp opening, and passes through the main nozzle 8. It reaches the side opposite to the nozzle 8. Opposite the main nozzle 8, the weft thread detector 9 is installed at an appropriate position to detect the front end position of the weft thread inserted, and detects the position reached by the leading end of the weft thread at each weft insertion. A signal S having a value corresponding to the length of the inserted weft determined by the front end position of the lever is output.

If the weft detector 9 is of a phototube type used in an air 1111 type loom, for example, it may detect the arrival position of the inserted weft light end based on changes in the amount of light received. In addition, if the electrode type used in water jet looms is used, multiple electrodes are arranged sequentially in the weft extending direction, and the arrival position of the weft light end is detected by the number of electrodes that become conductive when the weft reaches the weft. Just do it.

The output of the weft detector 9 is input to the control circuit 1o.

As shown in FIG. 2, the control circuit 1o includes a control unit 11:f consisting of an input port 101, a central processing unit (CPU) +02, a memory 104, and a data bus +03, a digital-to-analog (D-A) converter 105, and an amplifier 106.

Control unit 1. The rf input port l (JIK receives the signal S from the weft detector 9 every time the weft is inserted, and the input port 101 time-division multiplexes these signals and sends them via the data bus 1osy! / 104. The memory +04 is composed of a program memory section and a data memory section for commanding the GPL] 102 (7) operation, and outputs a signal S from the weft detector 9, that is, a signal S of the inserted weft. (length, weft length) information is stored in the data memory section one after another for each weft insertion. Then, the weft length information of the weft yarns stored in the data memory section is read out every predetermined number of times of weft insertion, and is averaged by the CPU I02. Then, in accordance with this average value, that is, the average length of the weft yarn in a predetermined number of times (in this embodiment, n times), the output signal value from the control section 10' is adjusted as appropriate, as will be described later. The output of the control unit IO' is converted into an analog quantity by the DA converter 105, amplified by the amplifier 106, and then input to the motor 1.

Note that the control unit 10' and CPU explained in the following explanation
Various operations of IO2 are performed by programming the operations of CPt 1102 in the program memory section of memory 104 using a known method. Although the motor 1 is a DC motor in this embodiment, it can also be used as a pulse motor by inputting the output of the control section 10'' to a pulse motor drive circuit, for example.

In this embodiment having the above configuration, when starting the operation of the loom, the initial rotational speed of the yarn storage drum 2 is set so that the theoretical length of the weft determined by the weaving width is measured and stored. .

It goes without saying that this initial rotational speed varies depending on the diameter of the yarn storage drum 2 used. Then, the signal value input to the motor 1 from the amplifier 106 is set so that the motor 1 rotates at the initial rotation speed. This setting is performed by changing the value of the signal (initial output signal value) output from the control section 10' to the DA converter +05.

After setting the initial output signal value from the control section 10' in this manner, the loom is started. After the first weft insertion is completed, the position of the inserted weft tip is detected by the weft detector 9.
Detected by. The output signal S of the weft detector 9 at this time is input to the input port 101 of the control unit 1σ, and is stored as weft length information in the data memory section of the memory 104 via the data bus +03.

When the first to nth weft insertions are performed in this way, the signal S is output one after another from the weft detector 9 to the input capo +01, and the first to nth weft insertions are stored in the data memory section of the memory 104. The n-th weft length information is stored. When the n-th weft insertion is completed, the CPUIO 2 reads out each piece of weft length information and calculates an average value. Then, the average value of the weft length during the first to nth weft insertions is compared with the theoretical length of the weft yarn. If the average value is smaller than the theoretical value, the output value from the control unit 10' increases and the motor The rotational speed of No. 1 becomes faster. Also, when the average value is larger than the theoretical value, the output value from the control unit 10' becomes smaller,
The rotation speed of motor 1 becomes slower.

In this way, the output signal value from the control unit 10' is adjusted appropriately according to the average value of the weft length for each of the 1st to nth times, and therefore, by changing the rotational speed of the motor 1, until the next weft insertion. During this period, the amount of weft yarn wound around the yarn storage drum 2 can be increased or decreased. Therefore, the length of the weft to be inserted during the next weft insertion can be changed, and the length of the weft can be adjusted to an appropriate value.

In the above description, the initial rotational speed of the motor 1 is set by the signal output from the control section +cf, but a setting device whose signal output value is variable may be used if necessary. In this case, the output direction of the setting device is input to the D-A converter (1os) or the amplifier (+06), and the output from the control unit 10' is set to positive or Set it to an appropriate negative value and send this signal to the D-A converter (1,04)
All you have to do is input it.

In addition, in the above explanation, the rotational speed of the yarn storage drum, that is, the number of revolutions until the next weft insertion, is changed according to the average value of the length of the weft for each of the 1st to nth times. The rotation speed of the yarn storage drum may be changed depending on the weft length for each rotation.

As described above, according to the present invention, the insertion length of the weft yarns can be changed steplessly depending on the woven fabric. In addition, the length of the weft yarn at each weft insertion can be detected and the insertion length of the weft yarn can be adjusted to an appropriate value based on this length.
Weft insertion can be performed using the optimum length measurement, and wasteful consumption of yarn can be prevented by setting the selvedge length to a specified length. Also, there is no need to store a large number of spare parts. Furthermore, there is no need for the troublesome procedure of changing the length measurement amount.
The operating rate can be increased.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing an embodiment of the invention, and FIG. 2 is a circuit diagram as well. 1... Motor 2... Yarn storage drum 6.
... Length measuring roller 10 ... Control circuit 101 ...
・Input port 102...Central processing unit 103...
・Data bus 104...Memory 105...Digital-analog converter 106...Amplifier patent applicant Tsudakoma Kogyo Co., Ltd.

Claims (1)

[Scope of Claims] (11) In a fluid injection loom, the length of the weft thread inserted each time is detected by a detector (9), and the average value of the length of the weft thread is detected every predetermined number of times of weft insertion. A weft length measuring method in a fluid jet loom, characterized in that the rotational speed of a length measuring roller is appropriately changed based on the average value. The output signal of the weft detector (9) is inputted to a weft detector (9) that detects the length of the weft thread and outputs a signal corresponding to the length, and the output signal of the weft detector is inputted every predetermined number of times. The output signal of the control circuit is input to a control circuit (]0) that calculates the average value of the measured signals and changes the output signal according to this average value, and the output signal of the control circuit is inputted to the drive shaft of the length measuring roller. 1. A weft 8+l length device for a fluid jet loom, characterized in that it comprises a motor (1) to which a rotating shaft is connected.