CS216534B2 - Appliance for fixing the needle bands - Google Patents

Abstract

In a needle support (1) of this type, the needles (6) fastened to a supporting strip (5) at a mutual distance from one another to form a needle bar are guided through bores (3) of the needle support (1) and are thereby fixed to the needle support (1) by a press fit. So as not to impair the strength of the press fit during a repeated reneedling of the needle support (1) as a result of a widening of the bores (3), and moreover to avoid having to adhere to narrow tolerances in the production of the bores (3), an axis-parallel recess (2) of greater width than the bores (3) is provided at the inner end of the bores (3) and the diameter of the bores (3) in the radial plane is somewhat larger than the diameter of the needle shanks (18). The needles (6) bear alternately on opposite sides of the needles (6) against a bearing point (7) in the recess (2) and against bearing points (8 and 9) at the inner and outer ends of the bores (3) under stress, thereby ensuring a very firm press fit as a result of the high elastic forces of the needles (6). <IMAGE>

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for attaching needle bands which consists of a support bar and needles mounted at equal distances on the support bar, a cylindrical needle carrier, or a partial cylinder carrier in textile machines, such as open-end spinning machines. carding machines, voohlovací machines, shunting machines, fibrillating machines, perforating machines or the like, with needles clamped in holes through the needle carrier.

In known needle carriers, the diameter of the holes for receiving each needle is aligned with the needle shank so that the shank has to be driven into the hole and is clamped there and held tightly there. These openings must be made with great precision due to differences in the tolerances of the needle shafts and the diameter of the holes must be chosen with respect to the smallest diameter of the needle shafts subject to deviations within the tolerances from the required diameter. When fitting needles with a cylindrical needle carrier or a needle cylinder in the form of a partial cylinder, the needles exceeding the desired diameter within the tolerances must be inserted into the apertures with great force, which can lead to deformation of the needle carrier, thereby causing additional operations. on . removal. of this ....

Moreover, such devices are only to a very limited extent suitable for removing old needles and fitting new needles, since they are once fitted. the needles are widened after removal of these needles so that repositioning with new needles cannot achieve the firm fit and grip of the needles as required by the high demands placed on the textile machine.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to overcome the above-mentioned drawbacks. to provide a device for attaching needle bands of the kind mentioned above, in which the holes can be of low precision and which are suitable for repositioning with new ones. needles.

This task does. According to the invention, the holes of the needle carrier are wider than the stem of the needle at least in the radial plane and the needle carrier has at least one needle band at the inner end of the holes, parallel to the axis of greater width than the holes and the individual needles the axial distances from one another in this recess to one support point and in the opening of the needle carrier to two further support points which. when viewed in the radial plane, they are alternately on opposite sides of the needle.

Compressing the needles in the recesses according to the invention. and that the holes at least in the radial plane have a slightly larger width than the needle shank have proven to be. very advantageous, since the diameter of the holes need not be selected now because of the smallest diameter of the needle shank, so that there is no need for a precise design of the holes and these can be made in a time-saving and inexpensive manner, for example by punching. The device according to the invention allows repeating of the shoulder. new needles after removing the old needles, because the needles rest against the support points formed in the recesses and holes and are thereby held firmly. This also does not reduce the quality of the bearings and the removal of old needles and new needles. the pinch of the needles due to the possible widening of the holes, since the elastic properties of the needles compensate for all these deviations. Due to the slight accuracy requirements of the holes, the needles may become. due to the relatively large tolerances allowed to associate in advance. and provided on the strips in strips corresponding to the axial length of the needle carrier, which can be provided by means of. Simple means to easily plant dio. corresponding holes. Thus, the strenuous placement of the needles in the respective holes is also eliminated.

A preferred development of the invention consists in. that the recesses of the needle carrier form. stop for the needle bar support rail. This is particularly advantageous. in a manner feasible by providing a stop for the carrier. the molding is. arranged at the radial outer. walls. a recess next to the mouth of the holes. This provides an additional protection against the needles outwardly as well as a precise alignment of the radial position of the needle bands. at. their gripping and receiving in the needle carrier. Especially effective development. of the invention can. in that . . In this connection, the stop for the support rail is arranged on the side wall of the recesses, which form a common location, respectively. together . . the needle support point of a single strip of needles.

In another, particularly expedient and advantageous development of the invention, the needle carrier for two adjacent needle bands has a common needle carrier recess. As a result, the manufacture of the needle carrier is effectively simplified. An additional advantage is in this. case reaches. if both adjacent strips are needles. common. U-shaped support rail whose arms are used. needles of one needle at a time,. as a stop point inside. recess. Due '. join in pairs. individual belts. needles se. the needling of the needles is considerably simplified, in particular a rigid bearing is achieved, e.g. needle carriers. ...

For such. design with. they can then. expediently arms in the shape of a letter. For the support rail a. team i. needles. to each other at one angle which deviates from the angle in the radial plane and which (at the respective apertures of the needle carrier) so that the needles in the installed position have a bias in the radial plane.

It is also within the scope of the invention that a wedge is directed at the needle shank with its tip k. the needle tip and also the needle carrier recess has a corresponding wedge shape. and the needle axis deviates from the radial plane. axis. hole o-. angle between 5 ° and 20 °. Thereby, it is possible to fully insert the needle shank completely into the wedge, which is particularly advantageous in making the wedge of plastic to achieve high strength of the needle bands.

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In order to provide additional protection against the inward punching of the needle strips, a further development of the invention consists in that an inner ring or shaft closing the recess is arranged on the inner shell of the needle carrier.

A preferred embodiment of the invention with respect to the improved fiber flow is further characterized in that the needle carrier has a surface layer on its outer surface.

If the needling is to be carried out on a case-by-case basis with different needle densities, it is an advantageous development of the invention that the holes associated with several adjacent or all needles of one needle band form a slot parallel to the axis in the needle carrier. As a result, the axial distances of the needles from each other on the needle strip are not determined by the axial distances of the holes in the needle carrier, so that according to the intended use of the device the needle strips have different axial needle distances in a single needle carrier.

Further advantages, details and features of the invention will become apparent from the following description of exemplary embodiments of the invention shown in the accompanying drawings.

FIG. 1 is a partial cross-sectional view in a radial plane of a needle-belt fastening device with a needle-shaped needle carrier partially inserted.

FIG. 2 is an enlarged detail of FIG. 1 showing a needle fastened and clamped in the hole and recess of the needle carrier.

In Fig. 3, which corresponds to Fig. 2, the support strip of the needle carrier supports the radial outer wall of the recess.

FIG. 4, which also corresponds to FIG. 2, shows a support strip which abuts the side wall of the recess and serves as a support point for the needle belt.

FIG. 5 shows a modified embodiment having a common recess for two adjacent needle bands.

FIG. 6 is a view corresponding to the vibration. 1, but with a common recess in the needle carrier for the two adjacent needle bands and with a U-shaped support rail for the two needle bands.

FIG. 7 is an enlarged view of FIG. 6 to illustrate the pinching and placement of the needles on the needle carrier.

FIG. 8 shows an enlarged cut-out of the needle carrier to illustrate the pinching and clamping of the needles in another embodiment.

FIG. 9 is a perspective view of a portion of the needle carrier of another modified embodiment with a slot parallel to the axis for accommodating the needles of a single band.

Fig. 10 is a top view of the outer portion of the needle carrier housing with needles and a corresponding bottom view.

FIG. 11 shows a needle carrier corresponding to FIG. 10 with openings connected to one slot.

FIG. 1 shows an embodiment of the device

534 for attaching a needle belt having a cylindrical needle carrier 1 'and having an inner shell having recesses 2 arranged parallel to the axis, i.e. perpendicular to the plane of the drawing, the recesses 2 being distributed uniformly over the inner circumference. In each recess 2, openings 3 are formed in the axial direction at equal distances from each other, extending from the radial outer wall 4 of the recess 2 to the outer shell 16 of the roller carrier 1. In this case, when viewed in the radial plane, the width of the recesses 2 in the needle carrier 1 is larger than the diameter of the holes 3. The axial distances of the holes 3 in each recess 2 correspond to the axial distances of the needles 6 arranged on the support bar 5 in the axial direction next to each other. In this case, the needles 6 can be fixed to the support bar 5, for example by soldering, welding or gluing. The individual needles 6 are guided from the inner space of the cylindrical needle carrier 1 through the holes 3 and are fastened by clamping.

In particular, the details of this clamping are clearly shown in FIGS. 2 to 4. From these figures it is clear that the individual holes 3 are somewhat wider in the radial plane than the diameter 17 of the individual needle shafts 18. The axis 19 of the bore 3 deviates by a slight angle of between 5 ° and 20 °, in the embodiment shown in FIG. 2, by approximately 10 ° from the axis 20 of the needle 6. This leads the needle 6 approximately diagonally o ^; 3 'and at the abutment point 8 it rests on the inner end of the opening 3, at the abutment point 90' the outer end of the opening 3 on its periphery. The heel 21 has a further abutment point 7 on the side bar 22 of the recess 2 of the needle carrier 6. These abutment points lie not in a radial plane on one line but alternately on opposite sides of the needle 6. Two parallel lines of thought parallel to each other. 7, 9, and the second abutment point 8, have a distance between them that is smaller than the diameter 17 of the needle shaft 18. resulting in the desired clamping and fastening thereof.

While in the embodiment according to FIGS. 2 and 3 the base of the needle base 21 lies on the side wall 22 of the recess 2, in the embodiment according to FIG. 5, both side walls 22, 23 of the recess 2 each have one support point 7 for each needle belt 24. It can be seen from FIG. 4 that the support strip 5 of the needles strip 6 abuts flatly on the side wall 23 of the recess 2. This bearing surface forms a third support point 7 'along the entire length of the support strip 5, except for the support points 8, 9 hole area 3.

The embodiment according to FIG. 5 deviates from the embodiment described above in that the needle carrier 1 has a common recess 11 for two adjacent needle belts 24. The needles 6 of the two belts 24,

The 24 ‘needles 6 have a bias in the 'mutually opposite' senses respectively. directions with respect to the circumference of the needle carrier 1.

FIG. 6 shows a view corresponding to FIG. 1 of a device which again has a recess 11 for two adjacent needles belts 24, 24 &apos;. However, the two individual belts are not fastened here in opposition to the embodiment of FIG. 24 of the needles 6, but the two needles 6 are connected by a U-shaped support rail 12 in a single unit forming a double needles strip 6. The distance 26 of the two needle axes 20 corresponds essentially to the distance of the axes 19 of the holes 3 in their regions. however, since the axes 19 of the two corresponding holes 3 diverged at an angle β outwardly, the needles 6 of both rows are forced into the holes 3 in the direction of these axes 19 as they are introduced into the holes 3. Thus, the two arms 13 are shaped. The letters U of the support strip 12 of this double strip · 25 needles 6 distort and form an angle γ which is smaller than the angle β, and the needles 6 assume the desired diagonal in their respective hole position. Here, the arms 13 form a third abutment point of each needle 6 in addition to the other abutment points 8, 9. The necessary bias is ensured by the flexibility of the support bar 12, see Fig. 7.

The introduction of the strips 24 of the needles 6 into the needle carrier 1 can be precisely defined if, for example, the support strip 5 bears with its head 27 against the radial outer wall 4 of the recess 2 or the recess. 11 (see FIGS. 3, 4 and 5).

the head 27 of the support strip 5 of the needle belt 24 is at a distance 28 from the radial outer wall 4 of the recess 2 of the needle carrier 1. However, the penetration rate of the strips 24 can be determined by a ring 31 or shaft 30 closing radially from the recess 2. 2, 3 and 7. These measures also prevent the belts strips 24 from falling out.

Referring to FIG. 8, a variation of the invention is shown in which a truncated cone-shaped wedge 14 is formed on the shaft 18 of the needle 6, with its tip pointing towards the needle tip 29. The wedge 14 may, for example, consist of plastic or the like. In the opening 2 of the needle carrier 1 has a corresponding wedge shape and the axis 20 of the needle 6 deviates again by a certain angle and from the axis 19 of the opening 3. The wedge 14 in this embodiment forms a third needle support point 6 in addition to the other support points 8 , 9 at the mouth openings 3.

It can be seen from FIG. 9 that instead of the individual openings 3, in which each individual needle 6 is inserted, one needle strip 24 is assigned a slot 15 in the needle carrier 1 parallel to the axis whose radially inner and outer mouth forms in the radial plane, diagonally to opposite edges, abutment points 8, 9.

The left-hand part in FIG. 10 shows a top view of the outer shell 16 according to FIGS. 1 to 3 or 8 of the needle carrier 1 fitted with needles 6.

It can be seen from these figures that the individual needle 6 abuts on the right side of the stem 18 of the needle 6 at its abutment point 9 located at the outer mouth of the opening 3, while the individual needle 6 on the left side of the stem 18 32 from its left edge. The corresponding bottom view, i.e., the inner skirt of the needle carrier 1 shown in the right part of FIG. 10, shows that the support point located here at the inner mouth of the opening 3 of the individual needle 6 is relative to the left part of FIG. just opposite to the left side of the needle shank 18. The distance 32 'corresponding to the distance 32 is here between the right side of the shank 18 of the single needle 6 and the right edge of the inner mouth of the opening 3.

In the embodiment shown in Fig. 9, in which the individual apertures 3 are connected in one slot 15 parallel to the axis for receiving the needle belt 24, a view of the outer shell 16 of the needle carrier 1 in Fig. 11 is shown. on the right side of the shank 18 at its abutment point 9, located at the right edge 33 of the outer mouth of the slot 15, and again between the left edge 34 of the outer mouth of the slot 15 and the left side of the needle shank 18.

Claims (11)

1. Devices for attaching needle bands consisting of a support bar and needles fixed at equal distances on this support bar, on a roller needle carrier or a partial cylinder carrier in textile machines, as open-end spinning machines, carding machines, stitching machines, drawing machines, fibrillation machines, perforating machines or the like, with needles clamped in holes through the needle carrier, characterized in that the holes (3) of the needle carrier (1) are at least radial a plane wider than the shank (18) of the needle (6) and the needle carrier (.1) has at least one recess (2, 24, 24 ') of the needles (6) at the inner end of the holes (3) , 11) parallel to an axis of greater width than BACKGROUND OF THE INVENTION the apertures (3) and the individual needles (6) are biased axially apart in this recess at one support point (7, 7 ', 13) and in the aperture (3) of the needle carrier (1) on two further abutment points (8, 9) which, when viewed in the radial plane, are alternately on opposite sides of the needle (6). Device according to claim 1, characterized in that a portion of the recesses (2, 11) of the needle carrier (1) form a stop for the support strip (5) of the needle belt (24). Device according to claim 2, characterized in that the stop for the support rail (5) at the radial outer wall (4) of the recess (2, 11) is arranged next to the mouth opening (3). Device according to claim 2, characterized in that the stop (6) for the support bar (5) is arranged at the side wall of the recess (2) and forms a common support point (7 ') of the needles (6) of one needle band (6). Device according to one of Claims 1 to 3, characterized in that the heel (21) of the needle (6) bears on the side wall (22, 23) of the recess (2, 11) of the needle carrier (1) forming the support point. (7). Device according to one of Claims 1 to 5, characterized in that the needle carrier (1) for two adjacent needles strips (24, 24 pás) has a common recess (11). Device according to claim 6, characterized in that the two adjacent strips (24, 24 ') of the needles (6) are assigned a common U-shaped support strip (12) whose U-shaped arms (13) form for needles (6) a support point located within the recess (11) in each case by one needle band (6). Device according to claim 7, characterized in that the U-shaped arms (13) of the carrier strip (12) and thus the needles (6) of the two needles (6) are arranged at an angle (γ) to each other. which is smaller than the angle (β) lying in the radial plane between the respective holes [3] of the needle carrier (1). 9. Equipment according to any one of items 1 to 8, characterized in that a wedge (14) directed towards the tip (29) of the needle (6) is provided at the needle shaft (18) and the recess (2) of the needle carrier (1) has corresponding the wedge shape and the axis (20) of the needle (6) in the radial plane deviates from the axis (19) of the bore (3) by an angle ()) in the range of 5 ° to 20 °. 10. The apparatus of any one of items 1 to 9, characterized in that the openings (3) in the needle carrier (1) associated with the needles (6) of one needle strip (24) form a slot (15) parallel to the axis. 11. The apparatus of any one of items 1 to 10, characterized in that an inner ring (31) or a shaft (30) closing the recess (2, 11) in the needle carrier (1) is arranged on the inner side of the needle carrier (6).