JPH0313458A - Drum device with groove for thread replacement - Google Patents

Abstract

PURPOSE: To prevent tilting of a yarn guide at a reversing point of a groove by a method wherein a supporting curved surface in a range of a top point of a reversing area of each end part of a spiral groove on a surface of a drum with the groove extends with an actually constant interval against an outside flank of the groove. CONSTITUTION: One front edge of a yarn guide 25 alternately passes within a position with a support or guide curved surface at the time of travelling to the inside of a guide groove 11 connecting grooves 5, 7 to each other. Tilting motion is generated on this yarn guide 25, and accelerating force generated due to reversion at a top point S is completely absorbed because of a position on the support curved surface 15. Additionally, neither of an outside flank 13 of the guide groove 11 and a surface 3 of a drum 1 with a groove between the guide groove 11 and the guide curved surface 15 receives influence due to high friction on a lower surface of an upper part 23 of the yarn guide 25. Similarly, local stress on the yarn guide 25, especially on a neck 33 connecting the upper part 23 and a lower part 27 is left to a very small load.

Description

DETAILED DESCRIPTION OF THE INVENTION The subject of the invention is a grooved drum device for yarn conversion according to the generic subject matter of claim 1.

Grooved rollers of this type, also called convertible spool rollers, are already known. They basically consist of a cylindrical body, on the surface of which are arranged two spirally formed grooves running in opposite directions, which grooves are connected to each other at the end of the drum. There is. The apex of the curve connecting the two grooves to each other forms the reversal point of the yarn guide, which is directed within the groove of the yarn drum. In order to generate the oscillatory movement, two guide rails parallel to the axis of the thread drum are fixed at a distance from each other and direct the thread guide fitted to the thread drum from side to side.

For example, high speed double stroke configuration and 8.00 Or, p,
At a speed of m, very high acceleration forces occur in the thread guide at the point of reversal at the end of the thread drum. Furthermore, even if it is assumed that the thread guide is simply Igr weight, a reversal force reaching 8ON is caused there. Movement of part of the mass of the thread guide in the grooves causes wear of the thread guide on the surface of the grooved drum. On the one hand, this leads to wear of the grooved drum and premature wear of the thread guide.

A converting device with a two-stage thread guide is disclosed in U.S. Patent No. 4.41.
No. 5,126, the thread guide is guided in the lower narrow part in the helical part of the groove and only in the upper part at the reversal point of the connection of two grooves running in opposite directions. Ru. For this purpose, the transfer of the two grooves running in opposite directions is carried out at both ends and in such a way that in the reversal region of the thread the guide is guided only on both sides from the upper part of the guide part of the thread guide. It is generated in two stages with adjacent regions. An auxiliary guide is fitted on the inner side of the inversion curve, the auxiliary guide having a different guiding path than the outer curve. In this known device, the yarn guide drum is expensive to manufacture and, moreover, it is not possible to prevent a tilting movement of the yarn guide at the point of reversal when maximum acceleration forces are applied.

The invention is an improvement in this respect The invention as characterized in the claims achieves the object of improving a grooved drum device for yarn conversion, which device can be achieved at low cost and at the point of reversal of the grooves. Prevents the thread guide from tilting.

Unexpectedly, with the guiding curve above the center of gravity of the thread guide at the point of reversal, the thread guide can be moved above and below it in such a way that tilting on the grooved drum and with it the increased local pressure is avoided. It has been found that holding the lower part as well gives good results. The improvement of the curvature supporting the yarn guide at the point of reversal is adapted to the yarn being processed in a way that keeps the characteristics of the reversal constant and independent of the wear condition of the yarn guide. A further advantage of the grooved drum according to the invention is that a longer service life of the grooved drum is achieved together with a longer service life of the thread guide.

The invention will be explained in detail below with reference to the illustrated embodiments.

[Example] FIG. 1 shows a grooved drum in the form of a cylindrical roller, on the surface of which two helical grooves 5 and 7 running in opposite directions are represented; The guide rail 9 seen in Figure 2 is omitted.

Grooves 5 and 7 are formed in a conventional manner and are therefore not shown in the central helical running region. At the reversal point A, the two grooves 5 and 7 are connected to each other via the curved part 11, and the support curve 15 extends substantially parallel to the flank of the outer curved surface 13 of the curved part 11. The supporting curve extends beyond the surface 3 of the grooved drum and is either part of the surrounding flange or part of the periphery of the surrounding flange.

The grooved drum 1 is fitted within the casing 17 and is laterally supported within the housing by roller bearings for rotation. The casing is closed on the sides, leaving free the sugonts 21 which pass through the two guide rails 9.

The guide rail 9 has, along the slot 21, a planar or V-shaped guide as shown in FIG. 2 at its base for thread guidance.

It is also possible that the edges of the guide rail 9 forming the slot 21 of the guide rail 9 are formed in other ways.

The upper part 23 of the thread guides 2, 5 widens for the slot 21. The lower part 27 of the thread guide 25, called the shirttle, lies completely within the guide groove 5.7. The thread guide plate 31, preferably made of ceramic, is located in the upper part 23.
A slot 29 is provided therein and extending above the surface of slot 21.

In FIGS. 4 to 9, the two aforementioned thread guides 25 used in the grooved drum 1 are explained in more detail.

The single-piece guide according to FIG. 4 is equipped with the already known shuttlecock 27, the shape of which occupies a position on the guide groove 5.7, is as smooth as possible and substantially passes through the reversal zone A. It is possible to run with low friction. The height h of the shaft corresponds approximately to the depth t of the groove 5.7. The shirttle 27 is connected to the upper portion 23 at a neck 33. According to FIG. 4, the upper part 23 is substantially diamond-shaped, so that its largest diagonal is arranged transversely to the longitudinal direction of the shuttlecock 27. The area furthest from the center has an inverse shape with respect to the configuration of both edges of the guide rail 9. In the embodiments of FIGS. 4 to 6, the upper part 23 of the thread guide 25 The guide pieces are basically square, but in the example according to FIGS. 7 to 9, the guide piece in the upper part 23 of the thread guide is V-shaped and fits into the guide groove 21 as shown in FIG. are doing.

The thread guide 25 according to FIGS. 7 to 9 is constructed in two parts, so that twisting of the upper part 23 relative to the lower part (shuttle) 27 is possible. For this purpose, the shirttle 27 has an injection-molded or attached peg 35, and the peg is attached to the upper part 27.
3 into a hole 37 for pivoting. It is also clear that it is possible to arrange the peg 35 on the upper part 23 and provide the hole 37 in the shirttle 27.

The two-piece thread guide 25 has an upper part 23, the guide piece 38 of which is formed straight, and the guide slot 2
1, a guide rail 9 allows linear guidance. The front edge 39 that reaches the position of the support curved surface at the curved portion 11 is formed into a curved surface. The radius R of the curved surface is approximate to the radius of the supporting curved surface 15.

Since the support surface 15 has a path that corresponds to the characteristic of the reverse curvature of the thread guide slot 29, an absolutely perfect fit does not result. The radial spacing between the outer flank of the groove 13 in the curved part 11 and the surface of the support curve 15 is equal to the lateral flank of the shuttlecock 27 and the leading edge 39 of the upper part 23.
It is at least constant in the region of vertex B between.

The function of the supporting curved surface 15 will be briefly described below.

Guidance and transport of the thread guide 25 is achieved in the usual manner between two turning points at the ends of the grooved drum 1. When running into the bend 11 connecting the grooves 5 and 7 with each other, one leading edge 39 of the thread guide 25 passes alternately into position with the supporting or guiding curve 15. Accelerating forces which cause a tilting movement in the thread guide 25 and due to the reversal at the apex S are completely absorbed due to the position on the supporting curved surface 15. Both the outer flank 13 of the guide groove 11 and the surface 3 of the grooved drum 1 between the bend 11 and the guide curve 15 are connected to the upper part 2 of the thread guide 25.
3 is not affected by the high Ha of the lower surface. Similarly, the thread guide 25, in particular the upper part 23 and the lower part 2
The local stresses on the neck 33 connecting with 7 are subject to very small loads. A suitably selected surface finish of the support curve 15 as well as in the area between the support curve 15 and the grooved drum 1 gives the grooved drum 1 a very low-wear behavior. Due to this, the service life of the thread guide 25 is also greatly increased.

[Brief explanation of the drawing]

FIG. 1 is a diagram of a grooved drum. FIG. 2 is a sectional view through the exchange device. 3 is a longitudinal sectional view of the grooved drum of FIG. 1; FIG. 4 is a diagram of the thread guide, FIG. 5 is a side view of the thread guide of FIG. 4, and FIG. 6 is a sectional view taken along the line Vl--Vl of FIG. 4. 7 is a diagram of the two-member thread guide, FIG. 8 is a side view of the thread guide of FIG. 7, and FIG. 9 is a diagram of the thread guide shown in FIG.
FIG. 1: Grooved drum, 5, 7: Spiral groove, 9: Guide rail, 11: Curved part, 13: Outer flank,
15: Support curved surface, 17: Casing,
21 Nislot, 23: Upper part, 25
: Thread guide, 27: Lower part (shuttle), 29: Thread guide slot, 31: Thread guide plate, 33:
Neck, 35: peg, 37: hole,
38: Information piece.

Claims (1)

[Claims] 1. A yarn guide (25) comprising two spirally formed grooves running in opposite directions and guided from side to side along a guide rail (9) within the grooves (5, 7). are in the surface of the drum, the grooves are connected to each other at both ends of the drum (1), and the expanded support curve (15) is connected to the grooved drum (1).
The reversal area (11) at each end of the spiral groove (5, 7) on the surface of (1)
), characterized in that the support surface (15) within the apex (S) of the reversal zone (11) extends at a substantially constant distance with respect to the outer flank (13) of the groove. Grooved drum device for yarn conversion. 2. Grooved drum arrangement according to claim 1, characterized in that the inlet end of the support curve (15) is located in a region in which the helical angle of the grooves (5, 7) is substantially constant. 3. The thread guide (25) comprises an upper part (23), the lateral edges of which are guided in grooves (5, 7) formed with a curvature (R); a lower part; 3. A grooved drum arrangement according to claim 1 or 2, which extends laterally beyond (27). 4. The edge (38) of the upper part (23) arranged transversely to the lower part (27) of the thread guide (25) is substantially straight, and the upper part (23) is similar to the lower part (27). 4. A grooved drum device according to claim 1, wherein the grooved drum device is pivotally connected to a grooved drum device.