JPS6330425B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a feeler head for an air jet loom, and more particularly to a feeler head having a function of detecting removal of weft threads.

In an air jet loom, a large number of open-loop air guides are arranged in parallel on the reed, and the weft thread is passed through these air guides and inserted horizontally.
When the reed is hit horizontally, it comes out through the open part of the air guide.
A feeler head is attached to a predetermined air guide, and removal of the weft thread is detected by this feeler head.

Conventionally, a filler head has a light emitting element 1 at one of the open ends of the head, as shown in FIG.
Then, a light-receiving element 2 or an optical fiber is installed facing each other on the other side to detect the weft thread passing between the two elements, or as shown in FIG. Flexible conductive plates made of phosphor bronze or the like are arranged facing each other, and the conductive plates are kept in contact with each other at all times, and when the conductive plates are separated from each other by the passage of the weft, it is detected. There was one that was designed to detect the passage of the weft thread.

However, with such a filler head, the optical axis may shift due to mechanical vibration of the air guide, or it may become impossible to maintain a normal detection position due to dust or dirt adhering between the contacts or on the element. There is a drawback that it becomes difficult to separate the contacts due to the load applied to the contacts when switching the operation of the reciprocating air guide and during both of the above-mentioned operations.

In view of the above, when detecting a weft thread passing through an open portion of a filler head, the present invention is designed to prevent a component force from being generated on a contact point of a weft detection portion of the filler head due to the reciprocating motion of the filler head. As a result, only the contact pressure of the contact itself acts on the contact, and the component force other than the contact pressure is not applied as a load to the contact.

SUMMARY OF THE INVENTION An object of the present invention is to provide a feeler head which eliminates the above-mentioned drawbacks, stabilizes the pressing force between the contact points, and can reliably detect the passage of a weft thread.

The present invention is characterized by a flexible piece that is swingably attached to one side of the air guide and has a conductive weft guide surface formed approximately parallel to the reciprocating direction of the filler head; A conductive flexible contact is swingably attached to the other side of the guide and comes into contact with the flexible piece.

The present invention will be explained below based on embodiments shown in the drawings.

In FIG. 3, an open loop air guide 10
A base end of a flexible piece 11 made of a conductive elastic material such as phosphor bronze is fixed to one open end 10A of the air guide 10, and a flexible piece 11 is fixed to the other open end 10B of the air guide 10. The proximal ends of a pair of flexible contacts 12 and 13 made of the same elastic material are fixed to each other.

The flexible piece 11 is fixed at its base end and can swing freely, and the flexible piece 11 is bent at the swinging end side so as to be substantially parallel to the reciprocating direction (arrow A) of the air guide. It has a weft guide portion 11a formed therein, and a pressing portion 11b whose arm is bent toward a flexible contact, which will be described later, further toward the distal end of the guide portion 11a.

The flexible contacts 12 and 13 have their proximal ends fixed separately (see FIG. 4), are electrically insulated from each other, and are swingable like the flexible piece 11. It has a contact part 12a with the guide surface of the flexible piece 11 on the side. The flexible contact 12 has an arm bent to some extent so that the contact portion 12a can be displaced away from the guide portion 11a of the flexible piece 11.

A lead wire 14 is wired to each base end of the flexible piece 11 and the flexible contacts 12 and 13, and this lead wire 14 is connected to an AND circuit of a detection section (not shown).

The filler head of the present invention configured as described above pulls out the weft yarn threaded through the air guide from the open part of the air guide when horizontally beating the air guide with the reed, and further pulls out the weft thread passing through the air guide from the open part of the guide, and then pulls out the weft thread passing through the air guide from the open part of the guide, and then pulls out the weft thread passing through the air guide from the open part of the guide. By shifting, the force distribution at the contact position between the guide surface 11a and the flexible contact 12 is changed to the fifth
As shown in the figure, it is possible to apply only the spreading force due to the weft to the flexible contact so that the component force due to the movement of the weft does not become a resistance force to the spreading force.

In addition, since the flexible contacts 12 and 13 are formed in a pair, the contact and separation relationship between at least one of the flexible contacts 12 and 13 and the flexible piece 11 is similar to that of the conventional single leaf pieces. As shown in Table 1, it is widely available. Furthermore, since the tip of the flexible piece 11 is bent from the guide part 11a, if separation of the two members by the weft is not confirmed at the contact position between the flexible piece 11 and the flexible contact 12, the guide Since the arm bent portion is pushed up by the weft moving along the portion 11a, the separation between the two members can be confirmed once again.

As described above, according to the present invention, in detecting the weft thread pulled out from the air guide when the air guide is horizontally threaded, the outer diameter of the weft thread can be detected without applying a component of the reciprocating inertia force of the air guide to the contact part. The contact portions are separated only by the spreading force, thereby generating no resistance force against the separation of the contact portions, allowing accurate detection of weft thread withdrawal, and further making this detection even more accurate. be able to.
Furthermore, the posture for detecting weft slip-out (6th
As shown in Figure), it can be used widely depending on the logical method, and other effects can be obtained.

[Brief explanation of the drawing]

1 and 2 are schematic diagrams showing a conventional example of a filler head, FIG. 3 is a schematic front view showing an embodiment of the present invention, and FIG. 4 is a side view of the embodiment shown in FIG.
FIG. 5 is a partially enlarged view of the embodiment of the present invention, and FIG. 6 is a diagram showing a detection position obtained by the embodiment of the present invention.

Claims (1)

[Scope of Claims] 1. In a feeler head for detecting a weft passing through an open part of a predetermined air guide in an air jet loom, the base is fixed to one tip of the air guide facing across the open part of the air guide. a flexible piece that is swingable and whose swing end side is bent in parallel to the reciprocating direction of the air guide and is formed as a guide surface for the weft moving from the open portion; The base is fixed to the other tip of the air guide facing across the open part of the guide so that it can swing freely, and the flexible piece is located on the weft passage side of the guide surface of the flexible piece. a flexible contact having a swinging end that abuts at right angles to the direction of bending and is shaped to be able to move away from the guide surface as the weft thread passes.