GB2046805A

GB2046805A - Comb for a cotton or wool combing machine

Info

Publication number: GB2046805A
Application number: GB8004846A
Authority: GB
Original assignee: BURCKHARDT AG CHRISTOPH
Current assignee: BURCKHARDT AG CHRISTOPH
Priority date: 1979-02-16
Filing date: 1980-02-13
Publication date: 1980-11-19
Also published as: GB2046805B; IT8019956A0; CH635137A5; DE3005399A1; IT8019956A1; IT1140617B; FR2449144A1

Abstract

A comb for a cotton or wool combing machine comprises a support 1 which is constructed as a circular cylindrical segment. Needle plates 3a, 3b, 3c are detachably fixed to the support, each needle plate comprising a plurality of needle rows. The fixing of the needle plates 3a, 3b, 3c is effected by clamp bars 8 which form dovetail grooves 5a, 5b, 5c either in conjunction with oblique shoulders 7a, 7c on the support or with an adjacent clamp bar 8. The needle plates 3a, 3b, 3c can be assembled or dismantled either in the axial direction or in the radial direction of the support. <IMAGE>

Description

SPECIFICATION Comb for a cotton or wool combing machine This invention relates to a comb for a cotton or wool combing machine with a support constructed in the form of a circular cylindrical segment, upon which needles are detachably arranged.

It is known, for example, to screw individual needle bars, each of which carries a single row of needles, to the peripheral surface of a cylindrical segment. Because the mutually adjacent needle bars necessarily partially overlap one another, it is impossible with this construction to extract individual needle bars for purposes of repairs or overhaul without previously removing all the needle bars placed in front of them.

According to another known construction the needle bars, provided with a profiled base, are slid axially into correspondingly shaped grooves in the support and fixed therein.

These needle bars can therefore be dismantled only in the axial direction of the support, which is disadvantageous in many cases owing to the spaced required. It is generally necessary for an entire segment to be dismantled from the combing machine in order that one needle bar can be removed axially from the segment.

Entire segment shells are also known, which can be placed on the segment-shaped supports. Such shells comprise, for example, from 1 5 to 20 needle rows. In order to replace a single needle or needle group, it is necessary to dismantle the entire shell and send it for repair.

The present invention aims to provide a comb for cotton or wool combing machines which permits the easy dismantling of individual needle groups and further permits the realisation of any desired combination of needle density, needle fineness and needle projections with the needle groups of a segment.

According to the invention, a comb for a cotton or wool combing machine comprises a support substantially in the form of a circular cylindrical segment which is provided with a plurality of needle plates each having a plurality of needles, each needle plate being inserted into a dovetail groove in the support, which groove has at least one of its longitudinal edges defined by a radially removable clamp bar screwed onto the support.

Preferably, the number of needle plates does not exceed four and each needle plate has a plurality of rows of needles of different projection The invention will now be described, by way of example, with reference to the accompanying drawings, in which Figure 1 is schematic perspective view of one embodiment of a circular comb in accordance with the invention.

Figure 2 is a sectional view of the comb shown in Fig. 1, Figures 3 and 4 are views similar to Fig. 2 of two further embodiments of combs in accordance with the invention, and Figure 5 is a detail of Fig. 4 on an enlarged scale.

In the embodiment illustrated in Figs. 1 and 2 the comb comprises a support 1 which has substantially the shape of a circular cylindrical segment. By means of holes 2 along its longitudinal edges the support 1 can be attached to a device, not shown, which executes a periodic reciprocating rocking movement.

To the radially outer side of the support 1 there are attached three needle plates 3a, 3b, 3c which are fitted with needles 4. Each needle plate 3a, 3b, 3exhibits a plurality of needle rows, which may differ with respect to the needle projection (clear needle height), the needle density (mutual needle interval) the needle diameter and the needle inclination.

Each needle plate 3a, 3 b, 3c is mounted individually in a respective dovetail groove 5a, 5b, 5c. In the case of the two outlying needle plates 3a, 3c, the edges of the dovetail grooves 5a, 5c, respectively, are defined on the one hand by an oblique shoulder 7a, 7c present on the support 1 and on the other hand by a clamp bar 8. The clamp bars 8, which are attached to the support 1 by means of screws 9, have a practically T-shaped crosssection and are inclined at their flanks so that the desired contour of the dovetail groove is produced. The edges of the central dovetail groove Sb are defined by two clamp bars 8.

By virtue of this construction the needle plates can either be slid into the grooves 5a, 5b, Sc in the axial direction of the support 1, or they may be mounted on and removed from the support in the radial direction of the latter. This facilitates the dismantling of the needle plates for the purpose of their repairs and overhaul, because each individual needle plate can be separately dismantled in this way and no space is required at the ends of the support when the needle plates are dismantled in the radial direction.

The individual needles are preferably neither stuck nor soldered in the needle plates, but simply fitted as a force fit; thus each needle is separately exchangeable with ease.

Because each needle plate exhibits a plurality of stationary needle rows, the mutual offset of the needles, once chosen, is constant from row to row.

The embodiment shown in Fig. 3 comprises a support 10 with fixing holes 11. In the central region of the support 10 there is a stationary retaining web 12, whilst a clamp bar 1 3 of trapezoidal cross-section is fixed by means of screws 14 to each of the two longitudinal edges of the support. Needle plates 1 6 with needles 1 7 are inserted into dovetail grooves 1 5 the longitudinal edges of which are defined on the one hand by the clamp bars 1 3 and on the other hand by the oblique surfaces 12a, 1 2b of the central retaining web 1 2. This embodiment presents the same advantages as that according to Figs. 1 and 2.

Figs. 4 and 5 show another advantageous embodiment. Here again a support 1 8 is provided which can be fixed by means of holes 1 9 to a reciprocating rocking device (not shown). Three needle plates 20a, 20b and 20c are attached to the radially outer side of the support. Again in this case the needle plates are mounted in substantially dovetailshaped grooves 21a, 21 band 21e and retained in said grooves by clamp bars 22. The clamp bars 22 are themselves firmly anchored in the support 18 by screws 23.

It is a matter of current knowledge to the expert that the needles 24 are pressed in conventional manner into correspondingly ar ranged holes of the needle plates. According to this known method it is thus necessary to provide the individual needle plates 20a, 20b, 20cwith a large number of ultra-fine holes which must be made with great precision at a quite specific angle. The subsequent pressing in of the needles into the holes also calls for great experience and can only be performed by highly skilled workers.

In the embodiment of Figs. 4 and 5, the needle plates 20a, 20b and 20c are not provided with a large number of holes, but with a plurality (in the present case five) of parallel longitudinal grooves 25 (Fig. 5). Metallic strips 26, which in turn carry the needles 27, are fixed in the longitudinal grooves 25.

The fixing of the strips 26 within the groove 25 may be effected, for example, by sticking or soldering the metallic strips to the groove wall opposite the needles 27. Sticking with "Araldite" (Trade Mark) has been found successful, for example.

As Fig. 5 further shows, the needles 27 soldered to the metallic strip 26 rest by their shanks against the inclined groove wall 28 adjacent to them, whereby the needle inclination is clearly determined. Because a groove 25 can be indubitably be produced by simpler means and less highly skilled personnei than a large number of fine oblique holes, this method of production on the one hand presents economic advantages and on the other hand still ensures the precise and reliable anchorage of the needles in the needle plates.

Claims

1. A comb for a cotton or wool combing machine, comprising a support substantially in the form of a circular cylindrical segment which is provided with a plurality of needle plates each having a plurality of needles, each needle plate being inserted into a dovetail groove in the support, which groove has at least one of its longitudinal edges defined by a radially removable clamp bar screwed onto the support.

2. A comb according to claim 1, in which each needle plate has one longitudinal edge retained by an oblique shoulder on the support, and its other longitudinal edge retained by said clamp bars.

3. A comb according to claim 1, in which two adjacent needle plates are retained at their mutually confronting longitudinal edges by a single clamp bar, the radially outer part of which exhibits oblique surfaces conforming to the dovetail shape.

4. A comb according to claim 2, in which the support comprises in the region of two adjacent needle plates a stationary retaining web which has on each of its two mutually opposite longitudinal edges an oblique surface to accommodate a longitudinal edge of a needle plate.

5. A comb according to any of the preceding claims, in which needle inclination and needle density vary within a single needle plate.

6. A comb according to any of the preceding claims, in which each needle plate is provided with a plurality of rows of needles of different projection.

7. A comb according to any of the preceding claims, in which each needle plate comprises a plurality of parallel longitudinal grooves into which the needles fixed on a continuous metallic strip project by their shanks, the metallic strip being attached to a wall of the longitudinal groove.

8. A comb according to claim 7, in which the needle shanks are soldered onto the metallic strip and the metallic strip is stuck or soldered to a wall of the longitudinal groove.

9. A comb for a cotton or wool combing machine constructed and arranged substantially as herein described with reference to, and as illustrated in, Figs. 1 and 2, Fig. 3 or Figs. 4 and 5 of the accompanying drawings.