JPH08209481A - Fast hooling/ releasing joint for bonding controlled link mechanism with heald frame of loom - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate an exchanging operation of a heald frame by installing a joint with fast engagement and release for coupling a connecting rod at the end part of a control linkage for the heald frame to the heald frame in a loom. SOLUTION: This joint comprises a tailpiece 8 having a C-shaped seat projecting from the bottom of a heald frame 2, a lever 9 with a hook end apt to engage into the C-shaped seat and the other end pivoted onto the big end of the connecting rod, and a guide element 10 of a plastic material apt to perform only vertical movement and to contain the lever 9. The guide element 10 comprises an upper end pocket 13 to house the tailpiece 8 and allow the tailpiece 8 to move horizontally in respect of the hook end of the lever 9.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the field of weaving looms, and more particularly to a quick-engagement / disengagement joint for connecting to a heald frame a linkage that controls its raising and lowering movements.

[0002]

2. Description of the Prior Art According to the prior art, a control linkage is connected by means of a connecting rod at its end to a heald frame of a loom, the large end of the connecting rod being pivoted on this frame by means of a bush. It has been known. This makes the replacement work of the heald frame very time consuming and complicated, but it is also known that such replacement work is frequent on a loom.

[0003]

SUMMARY OF THE INVENTION The present invention provides a completely new rapid engagement / disengagement joint for coupling a heald frame of a loom to an end connecting rod of a control linkage for the frame. Therefore, it is proposed that such work be facilitated and the speed be greatly increased.

[0004]

The joint of the present invention comprises:
A lever having a tail piece with a C-shaped seat protruding from the bottom of the frame, a hook end engaging this seat and the other end pivotally supported on the large end of the connecting rod at the end of the link mechanism. And a guide element of plastic material which includes this lever and carries out only vertical movements, which guide element accommodates the tail piece described above and which moves horizontally with respect to the hook end of the lever. It is characterized by the inclusion of a permissible top pocket.

Suitably, the pockets of the guide element are filled with a lubricant, whereas the connecting rod is formed as a fork, including the guide element, and is partially housed in the guide element. These various guide elements are in direct mutual contact and are free to move independently of the others.

[0006]

DETAILED DESCRIPTION OF THE INVENTION The present invention will now be described in detail with reference to its preferred embodiments shown in the accompanying drawings.

The transmission of the raising and lowering control from the shedding device 1 to the heald frame 2 in the loom, as schematically shown in FIG. 1, comprises a link with an adjustable connecting head 4 as is known in the art. It is obtained by the mechanism 3 in which the toggle lever 5 actuates the connecting rod 6 at the end.

According to the present invention, the connection of the connecting rod 6 at the end of the link mechanism 3 to the heald frame 2 is shown in FIG.
And rapid engagement / shown more clearly in FIG.
Obtained via a release type joint 7.

Each of these joints 7 is rigidly fixed to the heald frame 2 and has a tail piece 8 projecting from the bottom of the heald frame 2 and a hook lever pivotally supported on the large end of the connecting rod 6. 9 and a guide element 10 of plastic material which cooperates with these tail pieces 8, hook levers 9 and connecting rods 6.

The tail piece 8 is formed with a C-shaped seat 11, which accommodates the correspondingly shaped hook end 12 of the hook lever 9. The hook end 12 is attached to or detached from the seat by a simple horizontal sliding action.

The hook lever 9 is housed inside a guide element 10 which includes a pocket 13 on its top, the hook end 12 of the hook lever 9 being located in this pocket. The tail piece 8 of the heald frame can also be accommodated in the pocket on the side of the hook end 12. The guide element 10 is housed between fixed vertical guides 14 for only vertical movement. The connecting rod 6 is
It is pivoted at its small end to the toggle lever 5, including the lower part of the guide element 10 formed as a fork, and at its large end to the hook lever 9. At the same time, the connecting rod 6 is partially housed in the guide element 10, which is provided with an undercut suitable for this.

As can be seen in FIG. 1, each heald frame 2 is provided with two joints 7 for coupling with respective control linkages 3 and the loom comprises a group of adjusting heald frames. 2 are mounted, and each of them is moved by the link mechanism 3.

A lightweight and economical guide element 10 is shown in FIG.
As shown in (B) and FIG. 3 (B), they are arranged side by side so as to directly contact each other. This means that there is no interference between each of the hook levers 9 and between each of the respective connecting rods 6 housed in a suitable seat and / or undercut of the guide element 10 as shown. Because there is no interference. Due to the configuration arrangement employed, the guide element 10 does not require the use of conventional racks in the prior art. Therefore, it has become possible to advantageously obtain a very compact structure. The guide elements arranged in this way slide with respect to one another in the operation of the loom, according to the raising and lowering movements imparted to the respective heald frames, but this does not pose any problems. This is because the friction between the contacting surfaces of these guide elements is very limited due to the nature of the plastic material from which the guide elements were made.

2A and 3A, the last point to note is that the pivot shaft 15 of the toggle lever 5 is provided on the eccentric pin 16 and, if necessary, Means that all heald frames 2 can be raised or lowered simultaneously.

Due to the quick-engagement / disengagement joint of the present invention, the connection between the linkage 3 and the heald frame 2 is easily removable. Also, this can be done simultaneously for an entire group of heald frames, rather than individually for each heald frame. In fact, each heald frame has its own linkage,
A simple vertical movement that results in the insertion of the tail piece 8 into the pocket 13 of the guide element 10 and a subsequent horizontal movement that results in the engagement of the tail piece 8 of the hook end 12 with the C-shaped seat 11. Depending on the directional movement, the engagement can be very quick. Both of these actions can be obtained by shifting the entire group of heald frames 2 with respect to the set of guide elements 10 and hook levers 9. Detachment of the heald frame from the respective linkages can likewise be simple and quick by means of the two movements given in reverse order and orientation from those mentioned above.

It is advantageous to keep the pockets 13 of the plastic guide element 10 filled with lubricant each time a group of heald frames of the loom are replaced. This preferably allows engagement and disengagement between the tail piece 8 and the hook end 12 of the hook lever 9.

If it is desired to raise or lower all the heald frames 2 simultaneously, it is sufficient to provide a suitable rotation on the eccentric pin 16 of the pivot shaft 15 of the toggle lever 5.

[0018]

As will be appreciated, the connection between the heald frame and the respective control linkage is, according to the invention, directly connected to the connecting rod 6 at the end of the linkage. It is obtained by means of a member (hook lever 9), which is a very lightweight guide element (guide element in the vertical guide 14) that is not subjected to the load of raising and lowering the heald frame.
10) is equipped. This bond is further favored by the presence of complete and permanent lubrication, although there is slight friction between the unlubricated reciprocating sliding members. This is a clear advantage regarding the operation of the loom, considering the high speed of the mechanical members it contains.

Finally, it should be noted that the joint of the present invention provides particularly fast, simple engagement and disengagement of the heald frame with respect to the control linkage, as well as being particularly efficient, reliable and long lasting. The cost is limited.

[Brief description of drawings]

FIG. 1 is a schematic view showing transmission of raising and lowering control from a shedding device to a heald frame by a link mechanism in a loom, in which a connecting rod at an end is connected to a frame by a joint according to the present invention.

FIG. 2A is an enlarged view showing one of the joints at a position connected to the heald frame, and FIG. 2B is a heald frame group of the loom at a connection position of the link mechanism corresponding to FIG. It is a top view shown.

FIG. 3 (A) is an enlarged view showing one of the joints not connected to the heald frame, either before being connected to the heald frame or after being disconnected. FIG. 4A is a plan view showing a heald frame group of a loom at a connection position of a link mechanism corresponding to (A).

[Explanation of symbols]

 1 Opening device 2 Held frame 3 Link mechanism 4 Connecting head 5 Toggle bar 6 Connecting rod 7 Joint 8 Tail piece 9 Hook lever 10 Guide element 11 C-shaped seat 12 Hook end 13 Pocket 14 Vertical guide 15 Pivot shaft 16 Eccentric pin

Claims (4)

[Claims] 1. A connecting rod (6) at the end of a control link mechanism (3) for a heald frame (2) of a loom.
A quick-engagement / release joint for connecting
A tail piece (8) in which the joint comprises a C-shaped seat (11) protruding from the bottom of the heald frame (2).
A lever (9) having a hook end (12) for engaging with the C-shaped sheet (11) and the other end pivotally supported on the large end of the connecting rod (6), and the lever (9). ) And a guide element (10) made of a plastic material that only moves in the vertical direction, the guide element (10) including the tail piece (8).
For receiving the hook end (12) of the lever (9)
A joint characterized in that it comprises an upper pocket (13) which allows it to move horizontally with respect to. 2. Joint according to claim 1, wherein the pockets (13) are filled with a lubricant. 3. The connecting element (6) comprises the guide element (10).
Joint according to claim 1 or 2, which is formed as a fork including and is partially housed within the guide element (10). 4. A guide element (10) made of a plastic material in direct contact with each other.
Joint.