JPH0325532B2 - - Google Patents

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a weft selection method and device for a loom. It does not simply indicate the type of weft such as seed or color. For example, it is an expression that indicates the finger, weft, or running weft to be selected. This invention relates to an improvement of a system for selectively and sequentially inserting wefts.

(Prior art) Taking a rapier loom as an example, a weft selection method in a loom generally involves a mechanical or electrical weft command section in which a weft selection pattern, which is the selection order of wefts, is set, and a weft selection system that selects a plurality of wefts. A device is known that is composed of a finger that supports each weft thread and moves each weft thread to a weft insertion position, and a drive part that moves the finger with a desired weft thread supported in response to a selection command from a selection command part. .

By the way, in the above-mentioned weft thread selection device, as a result of a failure or malfunction of a part of the weft selection device, for example, the drive, the finger that should be moved based on the weft command may be different from the finger that actually moves. In such a case, weft yarns of a type that do not match the selected pattern are selectively inserted, resulting in weaving a cloth with a weave pattern different from the required selected pattern, resulting in weaving defects.

On the other hand, although looms generally have a function to detect when an accident occurs and automatically stop, this occurs when the warp or inserted weft is cut, or when no weft is selected or when the weft is not selected. In the event of an abnormal weft selection resulting in incomplete selection, the weft selection is stopped accordingly. Therefore, even if it is of a different type from the selection command as mentioned above,
In any case, as long as some weft yarn is selected and inserted normally, the loom will not be stopped. As a result, weaving defects can only be discovered after weaving is complete, causing defects.

In order to avoid such inconveniences, the present applicant has already proposed a new weft selection system in Japanese Patent Application Laid-Open No. 59-26556. That is, in this system, a selection signal indicating the weft to be selected based on the selection pattern and a detection signal indicating the weft actually selected by the finger or selection arm of the weft device are taken, and the selection operation by the selection device is completed. The two signals are compared when the selected weft reaches the weft insertion position, and the loom is stopped if the two signals do not match. This method has been successful in detecting when a weft different from the selected pattern is selected and automatically stopping the loom.

By the way, regarding the system of the prior invention mentioned above,
To form the detection signal, the movement of the fingers, rather than the weft itself, is detected. In other words, by ``the finger corresponding to the made selection being driven'', it is assumed that ``the weft yarn corresponding to the made selection was selectively inserted without any accident''.

This hypothesis holds true in many cases, but not necessarily in all cases. In other words, even if the finger corresponding to the selection made is driven, the weft yarn corresponding to the selection made may not be inserted without any accident.

Examples of failure of the fiction include (1) when the weft corresponding to the selection made does not come out even if the finger corresponding to the selection made is driven, and (2) when the weft corresponding to the selection made does not come out even when the finger corresponding to the selection made is driven. There are cases in which weft yarns other than those corresponding to the selected selection appear, and (3) cases in which the wefts are aligned.

The system of the prior invention described above cannot appropriately deal with such a case where the hypothesis is not established.

(Summary of the Invention) The present invention determines whether the selection of the weft necessary for weaving has been performed normally under any conditions when selecting the weft in a loom, and whether the correct weft selected is running for weft insertion. The purpose of this is to automatically stop the loom by detecting whether or not the loom is spinning, thereby improving the quality of the fabric and the operating rate of the loom.

Therefore, in this invention, a selection signal indicating the type of weft to be selected based on the selection pattern and a detection signal indicating the type of weft actually selected and its running state at the time of weft insertion are obtained, and after the selection is completed, The gist is to compare the two signals output at a predetermined timing, and to stop the loom if the two L signals do not match.

(Embodiment) FIG. 1 is an example in which the present invention is applied to an electric weft selection device.

The setting device 11 is used to set the combination of the weft selection code and the weft type number to be selected, and to set the weft selection order determined by the weft pattern, and the former is used when necessary. Decoder 1
2, it functions to output the latter to the selection command unit 1 and store it.

This setting device 11 holds selected weft yarns and their combinations in the form of a selection pattern as shown in FIG. As shown in FIG. 2, the weft selection code is shown in a circle on the left side, and the number shown on the right side is the corresponding weft number (for example, specifically, the finger number). For example, selection code 7 indicates a combination of fingers 1 and 2.

The selection command section 1, whose input side is connected to the setting device 11, has a memory function, and stores the commanded order of selection patterns determined by the weaving pattern.
Timing signals explained below for each revolution of the loom
At the rising edge of TS, the selection code signal S' for that cycle is output.

In the example shown in FIG. 2, the selection code signal 7 (that is, the first selection pattern in the commanded order) is outputted from the selection command section 1 as the selection code signal S'.

The decoder 12 receives and decodes the selection code signal 7, and outputs the corresponding weft selection signals, that is, selection signals 1 and 2. This selection signal S is input to the drive circuit 2 and stop signal generator 6. The drive circuit 2 has a function of making preparations for selecting a weft to be selected based on an input electrical signal.

The selection device 3 is a part that performs a weft selection operation, and moves the finger that supports the weft corresponding to the selection signal S from the finger group 4 to a selection position via the selection device 3 in accordance with the operation of the drive circuit 2. ,
The weft yarn supported by the fingers is pulled out to the weft insertion position.

In FIG. 1, black areas indicate mechanical connections. It is also possible to directly drive the finger group 4 with the drive circuit 2 composed of a solenoid or the like, and in that case, the selection device 3 is omitted.

A weft running detector 13 is engaged with each weft that is supported by the fingers and pulled out. A slide sensor or the like is normally used for this purpose. This weft running detector 13 detects the type of running weft and its running state from the movement of the weft itself, and outputs the detection signal DS at a predetermined timing after the selection is completed, and this detection signal DS is used to generate a stop signal. The signal is input to the device 6.

A timing signal from a timing signal generator 7 is further input to the stop signal generator 6 .
The timing signal generator 7 outputs the timing signal TS every rotation of the loom after the selection operation is completed (that is, at the timing after the finger moves to the selection position).

The timing signal generator 7 includes, for example, a shaft encoder that is attached to a loom crankshaft and outputs a crank angle signal, and a predetermined crank angle is set, and a shaft encoder and a setting device that outputs a set crank angle signal. The output of the comparator is inputted, and the output signal of the comparator is used as the timing signal.

During operation, the stop signal generator 6 compares the selection signal S input at the falling edge of the timing signal with the detection signal DS, and when the two signals do not match, sends the stop signal SS to a known loom stop circuit (not shown). output, and the loom stops at this time.

Note that the selection signal S input to the stop signal generator 6
The detection signal DS may be a so-called coded signal or a logic signal output to any one of the same number of signal lines as the number of wefts to be selected.

To explain more specifically, in the example shown in Figure 2, 7=1+2 is output as the selection code, so fingers 1 and 2 move to the selection position, and the corresponding weft threads are moved to the selection position. Selective weft insertion is carried out,
As long as the detection signal for the weft is being output, there is no mismatch in the signals, so no stop signal is generated, and the loom continues to operate.

If, for example, a detection signal for only the No. 1 weft is being output, there is a mismatch in the signals, so a stop signal SS is generated and the loom is stopped.

For example, when a detection signal indicating that the No. 1 and No. 3 weft yarns are being inserted is output, there is also a mismatch between the signals, so a stop signal SS is generated and the loom is stopped.

Furthermore, for example, the fingers No. 1 and No. 2 operate, and the weft yarns No. 1 and No. 2 are inserted and pulled out, but the weft yarn No. 3 gets entangled with the weft yarn No. 2, and the weft yarn No. 2 and No. When the wefts are aligned and inserted, a detection signal for the No. 3 weft is also output, so there is a signal mismatch and the loom stops.

What is shown in FIG. 3 is an example of another apparatus for implementing the present invention, in which a microcomputer 30 is used, to which a setting device 11 and a timing signal generator 7 are connected. An appropriate display 31 is attached. Detection of the weft W is performed by a slide sensor.

(Effects of the Invention) According to the present invention, the type of the selected weft itself and the running condition at the time of weft insertion are directly detected, instead of simulating the selection of the weft by the selection of the fingers. Even if this occurs, selection operation can be guaranteed. Therefore, it greatly contributes to improving the quality of textiles and the operating rate of looms.

In addition, in this invention, the weft running detector 13
Although configured as a part of the weft selection device, it goes without saying that an appropriate weft running detection device separate from the weft selection device may be used for connection as necessary.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing one example of the apparatus of the present invention, FIG. 2 is an explanatory diagram showing the operation of its main parts, and FIG. 3 is a block diagram showing another example of the apparatus of the invention. DESCRIPTION OF SYMBOLS 1... Selection command unit, 2... Drive circuit, 3... Selection device, 4... Finger group, 6... Stop signal generator, 7... Timing signal generator, 11... Setting device, 13... Weft running detector, S...selection signal, DS...detection signal, SS...stop signal, TS...
...timing signal.

Claims (1)

[Scope of Claims] 1. In a loom that selects and inserts a specific weft from among a plurality of types of wefts based on a predetermined selection pattern every rotation of the loom. A selection signal S indicating the type and a detection signal DS indicating the type of weft actually selected and its running condition at the time of weft insertion.
A weft selection method for a loom, characterized in that the two signals are compared at a predetermined timing after the selection is completed, and if the two signals do not match, the loom is stopped. 2. A timing pulse synchronized with the rotation of a loom is generated, one end of the pulse promotes a weft selection command, and the other end detects a mispick. Method described. 3. A selection command unit 1 that holds the selected weft yarns and their combinations in the form of a selection pattern and outputs selection code signals in the commanded order every time the loom rotates; and a selection command unit 1 that decodes the selection code signals from the selection command unit. do,
Decoder 1 that outputs a selection signal S corresponding to this
2, selection mechanisms 2, 3, and 4 that select weft yarns according to selection signals; and output detection signals DS indicating the type of weft yarn actually selected by the selection mechanism and its running state at the time of weft insertion. a weft running detector 13 that receives the selection signal and the detection signal, compares them at a predetermined timing after completion of weft selection, and outputs a loom stop signal SS when the two do not match. A weft selection device for a loom, comprising: