DE3138350A1 - Needle bar for textile machines - Google Patents

Abstract

Needle bars are inserted into endless toothed chains of the drawing-zone drive of textile machines for the drawing of slivers. The steel needle bar according to the invention has a bar body (10) with at least one longitudinal recess which can receive needle strips (16, 18) and a profiled metal sheet (14, 24). These needle strips consist of two at least 6 mm wide supporting sheets (16) which retain the needles (18) on their shanks (30). The supporting sheets (16) of the inserted needle strips extend down at least to the middle of the bar body. All the cavities between the profiled sheet (14, 24, 32) and recess or recesses of the bar body (10) are completely filled with a casting resin (20) which has a low viscosity during filling. <IMAGE>

Description

Needle bar for textile machines

Needle bar for textile machines The present invention relates on a needle bar for use in the endless inverted tooth chain of the stretching field drive of textile machines for drawing fiber ribbons, with laterally attached needle bars, wherein the needle shafts used in a holder of the rod body and a Profile sheet are surrounded.

From DE-PS 15 10 281 is a needle bar for the delay of a Sliver known with tiadelstäben drivable via endless chains, in which the needles are arranged in at least one row. A tongue-like projection serves as a back support for the welded or soldered hull shafts. Despite the overhang, the failure rate is relatively high, the attachment of the needles is expensive and not stable enough.

A correct alignment and fixation of the needles to be exchanged or pin bars and a simplified replacement process is described in DE-PS 21 53 493 proposed by the central area of the rod body on all sides by a sheet metal profile is surrounded by two upwardly protruding free ends. The needles are from the End faces of the sheet metal profile out; the needle feet are on one of the surfaces of the Directly supported by the rod. Zach of the embodiment in Figure 5 are the needles offset off-center. This version can be used in inverted tooth chains of stretch field drives However, it has two disadvantages: The needles attached outside the rod body offer Textile fibers are a good opportunity to stick to edges or corners and get an optimal one Operation to form disruptive wraps.

- The needles are not firmly anchored because the support plates short and the cover sheets are elastic.

According to GB-ES 1 400 989 there is a groove in the rod body itself left out. The needles lined up in a holder are inserted into the groove and with a plastic compound or a synthetic resin poured in. With constant use, However, the groove becomes wider and wider, the needles used then begin according to the ratio short work assignment to wobble.

Finally, the entire needle bar has to be replaced.

The inventor set himself the task of creating a merchandise rod for textile machines to create, which is mechanically stable with simple and inexpensive manufacture and has a long service life. Replaced needle bars with defective and / or worn needles should also be easily repairable.

The object is achieved according to the invention by what is specified in claim 1 ifIfeatures solved.

From the suitably round or rectangular in cross-section The rod body of the needle rod designed in a known manner is - mostly vertical to the plane formed by the rod body and crank - a recess milled out, in terms of length and depth, segments or over the entire length corresponds to the needle bars to be used.

On the one hand, the depth of the recess should not be too small so the support plates do not protrude laterally from the rod body; on the other hand should this depth should not be too great, so that the mechanical stability of the rod body is not reduced unnecessarily.

Around the textile fibers no starting points for the formation of To give wraps, the recess is preferably designed so deep that the the needle bars with it in sing handle bringing profile sheet flush with the rod body is.

The recess is on both sides in the longitudinal direction, preferably correspondingly the thickness of the profiled sheet, extended by a few millimeters so that its ends can be attached directly to the rod body, for example by spot welding. Are those particularly at risk? end- constant needles better protected.

With L-shaped profile sheets, for full-surface engagement with the needle bars, the rod body preferably also has a sheet thickness at the bottom corresponding recess, in the case of U-shaped profile sheets also on the other Side face.

The profile sheets are detachable (screws or the like) or non-detachable (spot welding, Rent or the like.) Connected to the rod body. Profiled sheets are made of wear-resistant Material, e.g. steel or aluminum alloy, they act further than Mold for the casting resin. In the case of L-shaped profile sheets, the lower side must therefore sealed, in the case of U-shaped profile sheets, the legs opposite the needles be made long enough so that the casting resin cannot leak.

The needle bars consist of a few centimeters long or about the entire length of the recess, preferably 6 - 8 mm wide sheet metal strips, between which the needles are attached, expediently by gluing along from Nantellar lines of the needle shafts. The needle feet are preferably with the lower one Long edge of the support plates flush.

Which preferably meet a few tenths of a millimeter thick sheet metal strips two functions: - Before the needles are poured in, they are their holder.

- When the needle bar is working, they enable a compensating surface load the needle pressure, which has a positive effect on the stability and service life of the needle bar affects, especially because these support plates are wider than usual are.

The casting resin used must preferably be less than 1OGOC Temperature should be as thin as water, wet metals well and a high one Have form filling capacity. No more air must be allowed when pouring blow form in the resin. Two-component epoxy casting resins have proven to be particularly favorable With components that are viscous at room temperature, after mixing at 30 - 400C are thin. Such an epoxy casting resin is available under the name WSBLANJ (Alfred Weber, Kirchweg 106, CH 8246 Langwiesen).

Before inserting the needle bars with ISEBLAN, the ISut is between Profile sheet and recess in the rod body preheated to 30 - 400C to approx. 1/3 with filled with the two-component resin, which is also heated to 70 - 400C, then the Needles are used and immediately afterwards the groove is completely filled. To cooling and standing, for example, about 20 hours at room temperature or 3 hours at 500C, the needle bar is ready for use.

Defective and / or worn needle bars are heated, with the casting resin becomes brittle. vJSBLLE is destroyed when briefly heated to 70 - 80 ° C. With a vibrator or the like.

you can now remove the needles, support plates and loose resin chunks will. If on the otherwise intact profile sheet and / or in the recess in the rod body If resin residues remain, they can be sanded out in a few simple steps. Defective profile sheets can be replaced with new ones at low cost.

Existing needle bars can easily be converted by using appropriate Recesses milled out and the other inventive measures taken will.

The invention is based on the exemplary embodiments shown in the drawing explained in more detail. They show schematically: FIG. 1 shows a vertical section through a Needle bar with L-shaped profile sheet - Fig. 2 is a vertical section through two successive ones Needle bars with a U-shaped profile sheet, and 3 is a horizontal section by a needle bar with a U-shaped profile sheet.

The right-angled rod body 10 shown in Fig. 1 has partly angled Longitudinal edges. An L-shaped profiled sheet 14 is attached to the rod body by means of weld points 12 10 attached, so that a groove is created, which corresponds to the width of the tiadelleiste / s to be used consisting of two support plates 16 and glued needles 18, corresponds. The profile sheet 14 protrudes beyond the rod body 10 along the needles 18.

The casting resin 20 fills all, including capillary-shaped cavities without any training of air bubbles. The escape of the casting resin it between the bottom surface of the rod body 10 and the profiled sheet 14 is by applying an adhesive 22 on the whole Length of the rod body 10 prevented.

The rod body 10 of Fig. 2 is by milling from the U-shaped Profile sheet 24,32 and the needle bars, formed from two support sheets 16 and glued Needles 18, corresponding recesses made from a round needle bar. That Profiled sheet metal is attached to the rod body 10 with weld points 12. These weld points have, even with L-shaped profile sheets 14, preferred in the longitudinal direction of the rod body a distance of 2 - 10 cm, especially 5 - 8 cm. The legs of the U-shaped Profiled sheet metal 24,32 can have a clamping effect. The casting resin 20 acts as in Fig. 1, Because of the raised leg 32, however, there is no sealing with an adhesive necessary.

The support rod 26 and the bearing pin 28 of the needle bar are also indicated.

Both embodiments have a very high stability because the needle shafts 30 and the correspondingly designed support plates 16 to well above are drawn down the center of the rod body 1C.

From Fig. 3, the arrangement of the recesses in the Rod body 10 and the attachment of the ends of the front leg 24 and the rear leg, respectively 32 of the U-shaped profile sheet is shown by means of weld points 12. On the The front of the rod body 10 is a shorter, deeper recess for needle bar / s 16,18 and a longer, less deep recess for the flush-mounted profiled sheet metal leg 24 trained. On the back of the rod body 10 is a recess for the rear profiled sheet metal leg 32 milled out.

Claims (9)

Claims 1. Needle bar for use in endless inverted tooth chains of the stretching field drive of textile machines for drawing fiber slivers, with laterally fastened I; are surrounded by the rod body and a profiled sheet, characterized in that - The rod body (10) made of steel on at least one longitudinal side Has recess for receiving needle strips (16,18) and profiled sheet metal (14,24), - two at least 6 mm wide, full-surface with the profile sheet (14,24) and the corresponding one Recess engaging support plates (16) for holding the needle shafts (30) reach down to at least the middle of the rod body (10), and - all cavities between the profiled sheet (14,24,32) and recess / s of the rod body (10) with a when pouring thin-flowing casting resin (2C) are completely filled. 2. needle bar according to claim 1, characterized in that the profile sheet (14,24) is releasably attached to the rod body (10). 3. needle bar according to claim 1, characterized in that the profile sheet (14,24) is attached to the rod body (10) by means of weld points (12) or rivets. 4. needle bar according to claim 3, characterized in that the weld points 2 - 10 cm, preferably 5 - 8 cm, apart in the longitudinal direction of the rod. 5. needle bar according to at least one of claims 1-4, characterized in that that L-shaped profile sheets (14) in the lower area, along the front edges, over are sealed the entire length with an adhesive (22). 6. needle bar according to at least one of claims 1-4, characterized in that that U-shaped profiled sheets (24,32) one pulled up to the top surface of the rod body (10), the needles (18) have opposite rear legs (32). 7. needle bar according to at least one of claims 1-6, characterized in that that all cavities with a thin fluid at a temperature of less than 10,000 Cast resin (20) are filled. 8. noble rod according to claim 7, characterized in that all cavities filled with a casting resin (20) which is thinly liquid at a temperature of 30-400C are. 9. needle bar according to claim 8, characterized in that all cavities are filled with a two-component epoxy casting resin (20).