JPH05302241A - Warp breakage detector of loom - Google Patents

Abstract

PURPOSE:To surely stop the loom even at a high speed with a warp breakage detector. CONSTITUTION:The upper heald bar A comprising the heald bar main body 2 as an inner conductor and a coating part 3 produced by coating the major part of the heald bar main body 2 with a non-conductive substance, the remaining part of the main body 2 being exposed, and the lower heald bar B comprising a conductor are transversely disposed in a heald frame 1. The upper and lower circular parts 4, 4 of conductor healds C are inserted into the upper heald bar A and the lower heald bar B. Further, a timing switch circuit E is disposed, the timing switch circuit E being closed only when a warp (t) inserted into a warp hole 5 placed at the intermediate position of the heald C is broken and when the broken warp is fallen to the lowest point as a lover warp.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention is
The present invention relates to a warp breakage detecting device for a loom that surely stops the loom.

[0002]

2. Description of the Related Art Conventionally, in a loom, there are various warp breakage detecting devices that sense a warp breakage and stop the loom by an electric circuit. Stopping the loom can prevent weaving of woven fabrics and defective products.

[0003]

In the warp breakage detecting device, an electrode is provided on the heald bar by applying the descending of the heald to detect the case where the warp is broken, and the electrode is made conductive by the breakage of the warp and is switched. A device for stopping the loom by closing the circuit has been considered, but a simple structure in which an electrode is easily provided on the heald bar does not exist.

[0004]

Therefore, as a result of intensive studies, the inventors of the present invention have found that the invention reveals a heald bar main body having a conductor inside and a part of the heald bar main body exposed. Then, the upper heald bar and the lower heald bar of the conductor, which are coated with the remaining portion coated with a non-conductive material, are laid horizontally on the heald frame, and the upper and lower annular portions of the heald of the conductor are inserted into the upper heald bar and the lower heald bar. And a warp breakage detection device for a loom provided with a timing switch circuit that closes only when a warp thread passing through a thread hole in the middle of the heald is broken, and when it becomes a bobbin thread and descends to the lowest point, or In the above configuration, the warp breakage detection device of the loom equipped with the bobbin thread tension applying device that applies tension to the bobbin thread in the warp ensures that the warp breaks only when the warp breaks. Machine can turn to stop, to solve the above problems, in which achieved its purpose.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure will be described below with reference to the drawings. FIG. 1 is a schematic view of a warp breakage detecting device of a loom, and a plurality of square heald frames 1 are provided at the upper side.
The upper heald bar A is provided on the lower side of the heald frame 1, and the lower heald bar B is horizontally provided.

The upper heald bar A is composed of a heald bar body 2 and a covering portion 3. The heald bar body 2 is made of a conductor such as stainless steel or iron, and has a rectangular ellipse with a vertically long cross section. Further, the covering portion 3 made of a non-conductive material is configured such that only the upper end of the cross section of the heald bar main body 2 is exposed as a conductor and the other whole is covered.

The non-conductive material may be a ceramic coating, an oxide film coating made of alumite, or a carbon film coating made of hard carbon.

The lower heald bar B is made of the same material and has the same shape as the heald bar body 2 of the upper heald bar A.

The heald C has annular portions 4 and 4 having elongated holes formed at the upper and lower ends thereof, and a thread hole 5 is formed at a substantially central position between the upper and lower portions thereof.
Are formed. The heald C is provided between the upper heald bar A and the lower heald bar B of the heald frame 1 by the number of warps. Specifically, the upper annular portion 4 of the heald C is inserted into the upper heald bar A, and the lower annular portion 4 thereof is inserted into the lower heald bar B.
A warp t is inserted through each of the yarn holes 5 of the large number of healds C, C, ...

A terminal 6 with a movable contact 6a is fixed to the end of the upper heald bar A. D is a switch body, on the upper side of which there are provided fixed side contacts 8 which are elastically supported by springs 7 by the number of the upper heald bars A, and on the lower side of the insulating portion 9 in the middle, there are tension springs. The upper end of 10 is locked. The lower end of the tension spring 10 is configured to pull the lower heald bar B upward.

The fixed contact 8 on the upper side of the switch body D
And a closed loop is provided between the upper end of the tension spring 10 and
A DC power supply DC is applied to this, and a filter 11, a logic circuit 12, and a relay Ry are provided in series from the fixed contact 8 side between the closed loops. The closed circuit thus configured is called a timing switching circuit E.

When the upper heald bar A is lowered, the fixed side contact 8 and the movable side contact 6a of the terminal 6 come into contact with each other only when the warp t breaks, so that the relay Ry operates and the loom of the loom is operated. It is configured to stop the main motor M.

FIG. 5 shows a lower thread tension applying device F for the warp threads t and t. Specifically, it is provided on the front and rear sides of the heald frame 1 and tension is applied when the warp t becomes a bobbin.

Next, the operation will be described. When the warp yarn t is cut during the operation of the loom (see FIGS. 1 and 2), the upper heald bar A of the heald frame 1 is lowered, the tension of the warp yarn t is lost, and the heald C is lowered, so that the annular portion of the heald C is formed. The inner upper end of 4 contacts the heald bar body 2 of the upper heald bar A. At this time, the circuit is closed from the DC power source DC through the fixed side contact 8, the movable side contact 6a, the terminal 6, the heald bar main body 2, the heald C, and the tension spring 10, and the relay Ry is operated to open the relay contact and the dependent contact. The electromagnetic contactor Mc is opened and the main motor M is stopped.

By providing the filter 11 for the detection signal, erroneous detection due to the looseness of the warp t can be prevented more reliably. Reference numeral 13 is a reed.

[0016]

According to the first aspect of the present invention, the upper heald bar includes the heald bar main body 2 having a conductor as an inside, and the covering portion 3 in which a part of the heald bar main body 2 is exposed and the remaining part is coated with a non-conductive material. A and the lower heald bar B of the conductor are laterally provided on the heald frame 1, and the upper and lower annular portions 4 and 4 of the heald C of the conductor are inserted into the upper heald bar A and the lower heald bar B, and the middle of the heald C. The warp breakage detection device of the loom is provided with the timing switch circuit E that closes only when the warp t passing through the yarn hole 5 is cut, and when the warp t becomes a bobbin and descends to the lowest point. Even if it is, the loom can be stopped without fail,
It is possible to provide it at low cost.

The effects will be described in detail below.
Since the length of the heald C is long, when the upper yarn bar A is lowered to the lowest point where the upper heald bar A becomes the lower yarn during operation, the heald C loses the tension of the warp yarn t. And at this time the upper annular part 4 of the heald C
Touches the heald bar body 2 of the upper heald bar A, and at the same time, the lower part of the heald bar always touches the center of this portion. As a result, the lower annular portion 4 of the heald C is moved to the lower heald bar B.
It comes into contact with the side portions of the sheet [see FIGS. 3 (a) and 3 (b)] and becomes conductive. Therefore, the timing switch circuit E having the DC power supply DC is closed, and the main motor M can be reliably stopped. In particular, this case is effective at high speeds. Further, the present invention has a simple structure and can be provided at low cost.

Next, in the invention of claim 2, in the invention described in claim 1, by equipping the lower thread tension applying device F for applying tension to the lower thread in the warp thread t, the heald frame 1 is moved up and down at high speed. Even if the warp yarn t is loosened due to the material or the magnitude of the tension during the movement, there is an advantage that the false detection can be prevented by increasing the tension by the lower yarn tension applying device F. That is, when looseness is caused by the material of the warp t or the magnitude of the tension, the heald C
The present invention can surely prevent that the main motor M is stopped due to the lowering of the warp yarn t as if the warp yarn t was broken.

[0019]

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of the present invention.

FIG. 2 is a perspective view of an essential part of the present invention.

3 (a) and 3 (b) are sectional views showing the working state of the present invention.

FIG. 4A is a sectional view of an upper heald bar, and FIG. 4B is a sectional view of a lower heald bar.

FIG. 5 is a schematic view in which a lower thread tension applying device is provided in the present invention.

[Explanation of symbols]

 A ... Upper heald bar B ... Lower heald bar C ... Held E ... Timing switch circuit F ... Bobbin thread tension applying device 1 ... Held frame 2 ... Held bar main body 3 ... Cover portion 4 ... Annular portion 5 ... Thread hole t ... Warp thread

Claims (2)

[Claims] 1. A heald bar body whose inside is a conductor,
An upper heald bar having a coating part in which a part of the heald bar main body is exposed and the remaining part is coated with a non-conductive material, and a lower heald bar of the conductor are laterally provided in the heald frame, and upper and lower annular parts of the heald bar of the conductor are provided. A timing switch circuit that is inserted into the upper heald bar and the lower heald bar and that closes only when the warp thread that passes through the thread hole in the middle of the heald is broken and when it becomes the lower thread and descends to the lowest point The warp breakage detection device for the loom. 2. A warp breakage detecting device for a loom according to claim 1, further comprising a lower thread tension applying device for applying tension to the lower thread in the warp.