JP2713713B2 - Weft insertion device abnormality detection device of air jet type loom - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a device for detecting an abnormality of a weft insertion device in an air injection loom. (Prior Art) A guide groove is formed by arranging concave portions formed in a reed dent in a row, and an auxiliary nozzle arranged at a predetermined interval in the guide groove pressurizes air in a weft insertion direction along the guide groove. An air-jet loom in which weft insertion is performed by injecting air is conventionally known and used. (Problems to be Solved by the Invention) However, in the conventional loom described above, the mist in which the lubricating oil used in the air compressor or the like is atomized is mixed in the jet air from the auxiliary nozzle. For this reason, the oil combines with dust existing in the air for a relatively long period of time, and the combined matter adheres to the downstream side wall surface of the reed. FIG. 4 shows this state, in which 1 is a reed, 1a is a row of concave portions, and W is a weft thread inserted into the concave portion. A is a combination of oil and dust adhering to the downstream side wall of each reed 1; When the combined substance a adheres in this manner, the interval between the reed fins 1 is substantially narrowed, so that the jet air from the auxiliary nozzle is less likely to leak toward the back of the guide groove as shown by the arrow A in FIG. As a result, the flow force flowing out as shown by the arrow B toward the release side of the concave portion 1a becomes stronger. If this tendency is strengthened, there is a problem that the weft W flying in the guide passage often jumps out of the guide passage on the airflow flowing to the release side as shown by the arrow B, resulting in a weft insertion error. there were. (Means for Solving the Problems) In order to solve the above-mentioned problems, in the present invention, a guide passage is formed by arranging concave portions formed in a reed dent in a row, and the guide passage is arranged at a predetermined interval in the guide passage. An air jet loom in which weft insertion is performed by injecting pressurized air in the weft insertion direction along the guide passage from the auxiliary nozzle provided, detects an airflow state in the guide passage during the operation of the loom. Means for providing an abnormal signal when the output from the detection means is out of a predetermined range during operation of the loom, and The weft insertion device abnormality detection device. (Operation) As described above, in the present invention, during the operation of the loom, the air flow state in the guide passage of the reed, that is, the flow velocity, the air pressure, the position of the air flow center, and the like are detected, and the state exceeds the predetermined range. Sometimes, an abnormal signal is output from the discriminating means to issue an alarm or stop the loom. Therefore, when a combination of oil and dust adheres between the reed wings, the state of the airflow in the guide passage changes. This is detected, and if this state causes frequent weft insertion errors, an alarm is issued. Or the loom is forcibly stopped to prompt the cleaning of the reed wings. Therefore, according to the present invention, since the airflow is detected during the operation of the loom, the maintenance time due to dirt on the reed can be accurately grasped during the operation of the loom, and the occurrence of weft insertion errors can be prevented to improve the production efficiency of the loom. be able to. Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the drawing, 1 is a reed, 1a is a guide passage recess formed in the center of the front surface of the reed 1, and 2 is a reed frame. 3 is a reed holder (lead holder) that holds the reed frame 2. 4 is a reed. A wedge member 5 for fixing the frame 2, a bolt 5 for fastening the frame member 2, a weft insertion nozzle 6 provided on one side of the reed holder 3, an auxiliary nozzle 7 disposed at a predetermined interval in a guide passage, and a reference numeral 8. This is a weft detector provided on the reed insertion side of the reed holder 3. In this embodiment, an air pressure measuring device 9 is used as a detecting means S for detecting an air flow state in the guide passage 1a.
And the opening end 9a of the air pressure measuring device 9 is set toward the weft insertion side in the guide passage 1a as shown in FIGS. 1 and 2. 1 shows an example of a judging means for judging whether or not the air pressure detected by the detecting means S is appropriate. Reference numeral 10 designates an appropriate pressure, and an electric signal corresponding to the pressure is sent to the comparator 11. A constant pressure setter 11 to be supplied is a comparator for inputting and comparing the output of the constant pressure setter 10 with an electric signal obtained by converting the air pressure detected by the detecting means S into an electric signal, and outputting the result. The amplifier 13 is an alarm which issues an alarm when the output from the detection means S is out of a predetermined range.
Is a stop switch for stopping the operation of the loom in the same state. (Effects of the Invention) As described above, in the present invention, the reed feathers 1
Air flow state in the guide passage 1a, i.e., flow velocity, air pressure,
The position of the center of the airflow is detected by the detecting means S, and when the state exceeds a predetermined range, an abnormal signal is output from the determining means T, and an alarm is issued by the alarm 13 or the loom is operated by the stop switch 14. And stop it. Therefore, if the combined substance a of oil and dust adheres between the reed wings 1, the state of the airflow in the guide passage 1a changes. This is detected, and this state is one in which weft insertion errors occur frequently. Alarm or forcefully stop the loom,
The cleaning of the reed 1 can be encouraged. Therefore, according to the present invention, since the airflow is detected during the operation of the loom, the maintenance time due to dirt on the reed can be accurately grasped during the operation of the loom, and the occurrence of weft insertion errors can be prevented to improve the production efficiency of the loom. The effect that it can be obtained is obtained.

[Brief description of the drawings] FIG. 1 is a partial elevational view of a loom equipped with the device of the present invention, FIG. 2 is a sectional view taken along the line II-II of FIG. FIG. 3 is a partial sectional view taken along the line III-III, FIG. 4 is an enlarged sectional view taken along the line IV-IV. 1 ... reed feathers, 1a ... recess (guide passage) 2 ... Reed frame, 3 ... Reed holder 6 ... weft insertion nozzle, 7 ... auxiliary nozzle 8 ... weft detector, 9 ... air pressure measuring device S: detecting means, T: determining means

Claims (1)

(57) [Claims] A guide passage is formed by arranging concave portions formed in the reed wings, and compressed air is injected in a weft insertion direction along the guide passage from an auxiliary nozzle arranged at a predetermined interval in the guide passage. In the air-jet loom designed to perform weft insertion, a means for detecting the airflow state of the guide passage during the operation of the loom is provided in the guide passage on the side opposite to the weft insertion or in an extended area thereof, and during operation of the loom, A weft insertion device abnormality detection device for an air jet loom, further comprising: a determination unit that outputs an abnormality signal when an output from the detection unit is out of a predetermined range.