JPH0241196Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to an electrode type weft detection device for a water jet loom, and particularly to an electrode type weft detection device suitable for high-speed operation.

(Prior Art) FIGS. 5 and 6 show an example of a conventional electrode type weft detection device for a water jet loom. In the figure, reference numeral 1 indicates a weft yarn, and the weft yarn 1 is inserted into the opening of the warp yarn 3 along with a jet of water from a weft insertion nozzle 2.
The inserted weft yarn 1 is driven into the fabric front 5 by the advance of the reed 4, and is immediately cut at the weft edge by the heat cutter 6 on the weft insertion side and after several picks on the opposite weft insertion side, thereby cutting the woven fabric 7. woven. 8 is a heddle, and 9 is a yarn end catching yarn.

Reference numerals 10a and 10b shown in FIG. 6 are insulators for supporting electrodes, which are fixed to the front surface of the reed 4 on the side opposite to weft insertion (between the warp threads 3 and the yarn end catching threads 9). A pair of weft detection electrodes 11a and 11b are arranged on the front surface of the reed 4 via insulators 10a and 10b fixed to the frame. Therefore, if the weft insertion is performed correctly, the beating process will cause these electrodes 11
The presence or absence of the weft thread 1 was detected by contacting the weft threads a and 11b with the inserted weft thread 1 and conducting electricity due to the moisture attached to the weft thread 1.

(Problem to be solved by the invention) However, in such a conventional weft detection device, the insulator holding the weft detection electrode was attached above the warp, so the water jet jetted from the nozzle 2 Due to the swinging action of the swinging motion of the reed 4, splashed water in the atmosphere carried by the airflow from the bottom of the reed 4 diagonally upward on the side opposite to the weft insertion is splashed onto the insulators 10a and 10b, and the water scale and warp threads are Glue etc. that fell from 3 are insulators 10a and 10b.
As a result, there was a problem in that insulation performance deteriorated early.

In addition, due to the increased speed of loom operation in recent years,
When the operating speed of the loom reaches about 800 to 1000 rpm,
In the conventional device in which the weft detection electrodes 11a and 11b are attached via insulators 10a and 10b fixed to the upper frame of the reed 4, the inertial force due to the swinging of the reed 4 becomes particularly large at the weft detection device attachment part. Reed 4
The deflection of the loom becomes large, and when the loom is restarted at low speed, the deflection decreases, resulting in the problem of formation of weaving steps in the woven fabric.

Furthermore, the device disclosed in Japanese Patent Application Laid-Open No. 54-2460 has a pair of electrodes erected on an insulator, and this insulator is fixed to a lead holder on the rear side of a reed, so that the reed can hold the electrodes. It is straddled and positioned in front of the reed. With this structure, the electrodes are formed relatively long at positions where the amount of oscillation is large.
When the speed reaches 1000 rpm, the vibration of the electrode increases and repels the weft yarn, resulting in a problem that the weft yarn is detected incorrectly.

Furthermore, since the weaving width changes in a loom, there is also the problem that the position of the electrode must be changed accordingly while maintaining a predetermined relationship with the weft.

The present invention was developed to solve the above-mentioned problems, and it prevents the deterioration of the insulation performance of the weft detection electrode, prevents the occurrence of weaving steps in the woven fabric, and even in high-speed operation. The purpose is to reduce the vibration of the electrode and to easily adjust the weaving width.

(Means for solving the problem) In order to achieve the above-mentioned object, in the present invention, a weft detection electrode that swings integrally with the reed is disposed on the side opposite to weft insertion of the weft insertion path. In a device that detects the weft yarn by bringing these electrodes into contact with the water-containing weft yarn during the beating process and conducting electricity,
An insulator holding member having a long groove parallel to the threaded sword shaft is provided adjacent to the threaded sword shaft,
An electrode holding insulator holding a weft detecting electrode is provided below the reed holder so as to be movable and adjustable along the long groove to constitute a weft detecting device for a water jet loom.

(Function) As described above, in the device of the present invention, since the electrode holding insulator is provided below the reed holder and close to the thread sword shaft, it is possible to prevent the insulation performance of the weft detection electrode from deteriorating and to enable high-speed operation. There is little vibration of the electrode even as the fabric ages, and it is possible to prevent the occurrence of weaving steps in the woven fabric. Further, since the electrode holding insulator is adjusted along the long groove provided in parallel to the thread sword shaft, the woven fabric can be easily adjusted without destroying the relationship between the weft and the electrode.

(Example) An example of the present invention will be described below with reference to FIGS. 1 to 4. In the figure, 20 is a thread sword shaft of a loom, and 21 is a thread sword. The lower end of the thread sword 21 is fixed to the thread sword shaft 20, and the upper end has a reed holder 22 fixed. 2
3 is a reed held between the reed holder 22 and the clamping body 24, and 25 is a bolt for fastening the clamping body 24 to the reed holder 22. Also 26 (see Figures 2 and 4)
27 (see Figures 1 and 3) is a weft, and 28 is a woven fabric.

1 and 2 show a first embodiment of the present invention, in which a bisected support 29 holding the thread saw shaft 20 is fitted onto the side opposite to the weft insertion side of the thread saw shaft 20. A flange portion 29b extending in the longitudinal direction of the thread sword shaft 20 is formed on the upper surface of a protrusion 29a slightly protruding from the upper part of the support body 29.
Screw holes 29c are provided at both ends of this flange portion 29b.

Furthermore, when the hollow rectangular cylinder is placed horizontally, a long groove 31a is provided in the upper plate part along the longitudinal direction of the rectangular cylinder, and a bolt insertion hole 31b corresponding to the screw hole 29c is provided in the bottom plate part for insulation. A body holding member 31 is formed, and this insulator holding member 31 is attached to the support body 2.
By placing the insulator holding member 31 on the flange portion 29b of the support body 2 and screwing the bolt 32 into the screw hole 29c through the bolt insertion hole 31b,
Fixed at 9. This insulator holding member 31 has a first
As is clear from Figure 2, it is provided parallel to the thread sword shaft 20.

Further, an electrode holding insulator 33 that can be slidably placed on the insulator holding member 31 is formed of ceramic or the like as a material, and bolt insertion holes 3 that pass vertically through both side flange portions 33a of this insulator 33 are formed.
3b is provided.

In addition, a bolt hole 34a corresponding to the bolt insertion hole 33b is inserted into a plastic holding member 34 that can be inserted into the insulator holding member 31 having a hollow rectangular cylindrical shape.
At the same time, a nut 35 is embedded and a bolt (fixing fastener) 36 inserted from above into the bolt insertion hole 33b of the electrode holding insulator 33 placed on the insulator holding member 31 is inserted into the long groove 31a and the bolt. By screwing into the nut 35 through the hole 34a, the electrode holding insulator 33 can be fixed at a desired position. In this case, by providing the flange portion 29b of the support member 29 as close to the thread sword shaft 20 as possible, the insulator holding member 31 is also brought close to the thread sword shaft 20, and the electrode holding member attached to the insulator holding member 31 is The insulator 33 is configured to be located below the reed holder 22 and as close to the thread sword shaft 20 as possible. As is clear from the above description, the long groove 3
1a is provided parallel to the thread sword shaft 20.

In the figure, 37 and 38 are a pair of weft detection electrodes protruding from the electrode holding member 33, 37a and 38a are insulating coatings (for example, plastic tubes) for each electrode 37 and 38, and 37b and 38b are electrode support tubes.
39 and 40 are nuts for fixing the electrodes. Also 4
1 (see FIG. 2) is a lead wire for the electrodes 37 and 38.

3 and 4 show a second embodiment of the present invention, in which the same reference numerals as those described above indicate equivalent parts.

To explain only the parts that are different from the first embodiment, in this example, the flange portion 29 of the two-piece support body 29 that holds the thread sword shaft 20 is
Two bolt insertion holes 29d are provided in b, and instead of the hollow rectangular cylindrical insulator holding member 31 of the first embodiment,
An insulator holding member 43 is formed of a substantially channel-shaped member having a long groove 42 expanding upward, and a screw hole 43a corresponding to the bolt insertion hole 29d is provided in the web portion (bottom plate portion) of this member 43. , the bolt 44 inserted through the bolt insertion hole 29d
The insulator holding member 43 is fixed by screwing into the screw hole 43a of the insulator holding member 43 placed on the flange portion 29b.

Further, a rectangular tube-shaped electrode holding insulator 45 is inserted to one side of the long groove 42, and a wedge-shaped pressing body 46 is inserted into the remaining space.
Bolts 47 inserted from above into two bolt holes 46a passing through the insulator holding member 43 vertically
By screwing into the screw hole 43b provided at the bottom of the electrode holding insulator 45, the electrode holding insulator 45 can be fixed at a desired position by the wedge action of the pressing member 46. Note that if a large number of screw holes 43b are provided along the longitudinal direction of the insulator holding member 43, when the fixed position of the electrode holding insulator 45 is moved, the fixed position of the pressing body 46 is also changed to the long groove. 42.

Next, the operation of the device of the present invention constructed as described above will be explained.

In the first embodiment shown in FIGS. 1 and 2, in order to change the fixing position of the weft detection electrodes 37 and 38 when changing the cloth width, loosen the bolt 36.
By moving the electrode holding insulator 33 left and right along the long groove 31a of the insulator holding member 31, it can be easily displaced to a desired position. In this case, the holding member 34 also moves together with the bolt 36, so if the bolt 36 is tightened at the desired position, the weft detection electrode 34 will move together with the electrode holding insulator 33.
7 and 38 are securely fixed.

Since the long groove 31a is provided parallel to the thread sword shaft 20, the relative positions of the electrodes 37 and 38 with respect to the weft 27 do not change.

Furthermore, in the second embodiment shown in FIGS. 3 and 4, the wedge action of the pressing body 46 disappears when the bolt 47 is loosened, so that the electrode holding insulator 45 can be freely moved along the long groove 42. can. Then, when the insulator 45 is at the desired position, by tightening the bolt 47, the insulator 45 can be reliably fixed by the wedge action of the pressing member 46. In this case as well, the relative positional relationship between the electrodes 37, 38 and the weft thread 27 remains unchanged.

(Effect of the invention) As described above, in the device of the present invention, since the electrode holding insulators 33 and 45 are provided below the reed holder 22 and close to the thread sword shaft 20, the water jet from the weft insertion nozzle is Due to the agitation effect caused by the rocking motion of the reed, most of the scattered water in the atmosphere carried by the airflow from the bottom of the reed toward the diagonally upward direction on the opposite side of the weft insertion is splashed onto the electrode holding insulators 33 and 45. It disappears. Therefore, according to the present invention,
It is possible to effectively prevent a decrease in the insulation performance of the weft detection electrode, which occurs in conventional devices.

Furthermore, since most of the constituent members of the device of the present invention are installed close to the thread sword shaft 20, even when the loom is operated at high speed, the inertial force acting on the device of the present invention is greater than that of the conventional device. It's extremely small. Therefore, since the weft detection electrode of the device of the present invention has less vibration, detection errors are also reduced accordingly. Furthermore, since the inertial force acting is small, the deflection of the reed is also small, so it is possible to prevent the occurrence of weaving steps.

Further, according to the device of the present invention, when changing the position of the weft detection electrode when changing the weaving width, the electrodes 37 and 38 are moved parallel to the thread sword shaft 20, so that the relative relationship between the weft and the electrode is changed. Since the positional relationship does not change, it is also possible to easily change the weave width.

[Brief explanation of the drawing]

Fig. 1 is a partial front view of a loom showing a first embodiment of the invention, Fig. 2 is a side view thereof, Fig. 3 is a partial front view of a loom showing a second embodiment of the invention, and Fig. 4 is a partial front view of a loom showing a second embodiment of the invention. A side view thereof, FIG. 5 is a partial plan view of a loom equipped with a conventional device, and FIG. 6 is a front view of the main parts thereof. 20... Thread sword shaft, 21... Thread sword, 22... Reed holder, 23... Reed, 26...
Warp, 27... Weft, 29... Support, 31, 4
3... Insulator holding member, 31a, 42... Long groove,
33, 45... Insulator for electrode holding, 34... Holding member, 36, 47... Fixing fastener (bolt), 3
7, 38... Electrode for weft detection.

Claims (1)

[Scope of utility model registration request] Weft detection electrodes 37 and 38 that swing integrally with the reed 23 are arranged on the side opposite to the weft insertion path of the weft insertion path, and during the reed beating process, these electrodes come into contact with the water-containing weft 27 and become electrically conductive. In this device, insulator holding members 31 and 43 having long grooves 31a and 42 parallel to the thread sword shaft 20 are provided close to the thread sword shaft 20, and weft thread detection electrodes 37, A weft detection device for a water jet loom, characterized in that electrode holding insulators 33, 45 holding electrodes 38 are provided below the reed holder 22 in relation to the long grooves 31a, 42 so as to be movable and adjustable.