FR2529587A1 - Fastening device for the harnesses of looms of the jacquard type in particular. - Google Patents

Abstract

The invention relates to the technical sector of weaving and more particularly of shed mechanisms. The device comprises essentially, for each heald L of the harness, two rods 1 fastened to the two ends of the corresponding return spring R of the heald, each of the rods 1 having one end shaped so as to be fixed removably, without extra thickness to the spring R, whilst the other end of said rods is arranged, as regards the upper rod, to be fixed to the terminal ring or terminal part for attachment to the lower end of the healds and, as regards the lower rod, for coupling it to the stationary lower retaining beam. The invention is used particularly for ensuring the permanent return of individual healds in the downward direction.

Description

 The subject of the invention is a fastening device for harnesses in looms of the Jacquard type in particular.

 The object of the invention relates to the technical sector of weaving, more particularly crowd mechanisms.

 In weaving looms of the Jacquard type in particular, the stitches or heddles through which the warp threads which are raised or lowered pass, and the whole of which constitutes the harness, are fixed at the end, at their upper end, to the arcade cords s and, at their lower end coupled to different means shaped to ensure the return of the individual beams, towards the bottom.

 Generally, as shown in Figure 1, the means do return down the beams (L>, are helical springs (R).

The two ends of each spring (R), are integral with the fixing ends (E1 and E2) forming eyelets for fixing as semblage / 80seebxi ities of the spring and of the ends is effected by direct molding, fitting or otherwise, in the end caps. The end pieces (E1 and E2) therefore form extra thicknesses with respect to the dimension in section of the springs.

 In a known manner, the upper end piece (El) is hooked in the lower end ring of the healds, while the lower end piece (E2) is coupled to the fixed fixed base (S).

 The fixing of the return springs (R) by means of the end caps has certain drawbacks known to professionals.

 It is to remedy this in an efficient, simple and advantageous manner that the fastening device according to the invention has been designed.

By this device, we wanted to achieve an adjustable and easily removable and interchangeable elastic attachment of the return springs of each of the heddles, eliminating any bulge at the ends of said springs.

 This device is characterized in that it essentially comprises, for each heald (L) of the harness, two rods (1) fixed to the two ends of the corresponding return spring (R) of the heald, each of the rods (1) having a shaped end to be integral, in a removable manner, without additional thickness with the spring (R), while the other end of said rods is arranged for the upper rod, in order to be made integral with the terminal ring or terminal part d 'attaches to the lower end of the healds and, for the lower rod, for its coupling to the fixed lower bed base.

 This and other characteristics will become apparent from the following description.

 To fix the subject of the invention, without however limiting it in the appended drawing.

 FIG. 1 is a front view showing the fixing, in a known manner, of the return spring relating to a heddle of a Jacquard type loom.

 Figure 2 is a view similar to Figure 1 showing the attachment according to the invention, the return spring.

 Figure 3 is a large-scale front view of the attachment of one of the ends of the spring.

 Figure 4 is a cross-sectional view taken along line 4-4 of Figure 3.

 FIG. 5 is a partial cross-sectional view taken along line 5-5 of FIG. 4.

 In order to make the object of the invention more concrete, it will now be described in a nonlimiting manner with reference to the example of the figures in the drawing.

 We see Figure 2, in a known manner, a heddle (L) which comprises, substantially halfway up the crowd, a link (him) for the passage of the warp thread considered. Each of the ends of the heddle (L) has a terminal ring (L2 - L3). The upper ring or loop (L2) is fixed to the corresponding drip rope (not shown), while the lower terminal ring Ct3) allows the coupling of the return spring (R) of the beam considered.

 According to the invention, the two ends of the set of return springs (R), snt each secured in a removable manner, a cry coupling rod).

 Each rod (1), in particular of circular cross section, allows, at one of its ends, the mounting of the extreme turns of the spring (R). To this end, in a preferred manner, one of the ends of the rods (1) has a threaded surface (ia) shaped to allow the screwing of the extreme turns of the spring (R) (FIG. 3).

 The diameter of the remaining smooth bearing surface (lb) of the tires (1) is very slightly less than the external diameter of the spring (R) (figure 5), or at most equal to this diameter so as not to form excess thicknesses at the two ends of the spring .

 In addition, the threaded end surface (la) of the rods (1), presents two opposite and parallel flats (la) and (1a2) for f7- to militate its eneagelrent with the corresponding end of the spring (: (figure 4 ).

 Each return spring (R) is fixed at its two ends by means of the rods (1), on the one hand to the lower part of the corresponding rail (L) and on the other hand, to the fixed fixed base. For example, the end of the upper rod (i), opposite the threaded seat (la) has a fastening hole (lake) cooperating directly, or via a link (2), with the lower end ring (L3) of the arm (L). The other end of the lower rod (i), still at the opposite of the bearing surface (la), is conformed (id) for its coupling to the fixed fixed base (S).

 It is obvious that the coupling rods (l) can be made in all dimensions and in any rigid or semi-rigid material.

 The advantages emerge clearly from the description, in particular it is emphasized - There is no bulge at the connection ends of the return springs, and consequently no risk of hooking of the beams liable to create a defect on the tissue which results in an irregularity.

- The ease of repair in the event of a rupture of one of the return springs, since it suffices to unscrew it from the threaded seats (lb) of the rods without changing the corresponding smooth or mesh, then to replace it with another spring.

 In contrast, in known systems, in particular such as those defined in FIG. 1, it is necessary to change the assembly of the spring and of the coupling end caps, resulting in a greater loss.

 The invention is in no way limited to that of its modes of application any more than to those of the embodiments of its various parts which have been more particularly indicated; on the contrary it embraces all variants

Claims (1)

 CLAIMS -1- Attachment device for the harnesses of the Lype Jacquard notarmet looms, characterized in that it essentially comprises, for each arm (L) of the harness, two rods (l) fixed at the two ends of the corresponding return spring (R) of the arm; each of the rods (1) having one end shaped to be integral, ctunably removable without excess thickness, with the spring (R), while the other end of said rods is arranged, for the upper rod, in order to be made integral of the terminal ring or terminal part of attachment to the lower end of the heddles and, for the lower rod, with a view to its coupling to the fixed lower bed base. -2-Device according to claim l, characterized in that one of the ends of the rods (1) have a bearing surface (1a) threaded to the pitch of the spring and which is shaped for the screwing of the extreme turns of the spring (R ) corresponding, the diameter of the remaining smooth part (lb) of the rods being a little less than the external diameter of the spring, or at most equal to this diameter so as not to form additional thickness at the two ends of said spring. -3-Device according to claims l and 2 together, characterized in that the threaded end portion (la) has two opposite and parallel flats (lal) and (la2) to facilitate its engagement with the corresponding end of the spring.