Needle bar for chain drawing frame

Abstract

Faller bar for chain drafting systems The claim is for a faller bar (1) with a support bar (2) and a casing (4) surrounding the same, and also for a number of pins (3) arranged adjacent to each other, wherein the support bar (2) has a diameter (d) of 5.9 mm to 6.1 mm and the casing (4) has a thin-walled zone (4a) having a wall thickness (b) of 1.4 mm to 1.8 mm.

Description

Some examples of different embodiments of the invention will now be presented in more detail, with the aid of diagrams. The following are shown:

FIG. 1 a side view and a view from above of a faller bar for a chain drafting system,

FIG. 2 a cross-section through the faller bar along line II-II as shown in FIG. 1,

FIG. 3 two faller bars as shown in FIG. 2 and arranged in a chain, and

FIG. 4: a cross-sectional view of the end of a chain drafting system with a number of faller bars arranged in chains, together with the arrangement of rollers for transporting a fiber sliver.

Corresponding components are given the same reference symbols in all of the diagrams.

FIG. 1 shows two different views of a faller bar 1 for a chain drafting system 8 (FIG. 4). The faller bar has a support bar 2, one end of which is formed as a shaft 2a. At the opposite end to the shaft 2a, it is fitted with a bearing bore 2b. The support bar 2 is covered with a casing 4, which is formed as a rib 4b on one side. A number of pins 3 is arranged in a row along the longitudinal axis 6 of the support bar. The casing 4 consists of a plastic material, which is applied by a spraying process while the pins 3 are being mounted onto the support bar 2. A pair of guide grooves 7 is in each case formed in the section of the support bar 2 between shaft 2a and rib 4b.

FIG. 2 shows a cross-section through a faller bar. The support bar 2, which is characterized by a diameter d, lies inside the cross-section. In relation to the longitudinal axis 6 of the support bar, the thinnest zone 4a of the casing 4 lies opposite to the part of the casing 4 that is formed as rib 4b. This thin-walled zone 4a of the casing 4 extends at least over half the bar circumference of the faller bar 1, i.e. at least over the semi-circular curved region of the faller bar 1, which lies under the central line M, running through the longitudinal axis 6, of support bar 2, as shown in the diagram.

The distance between the longitudinal axis 5 of each pin and the longitudinal axis 6 of the support bar will subsequently be referred to as the pin distance, and is the result of the difference between radius D/2 of the faller bar 1 and the half thickness m/2 of rib 4b. At a rib thickness of m=3.7 mm, in a preferred embodiment, the pin distance is a=2.75 mm, when the diameter of the support bar is d=6.0 mm and the casing has a wall thickness of 1.6 mm in the thinnest-walled zone 4a.

FIG. 3 shows the arrangement of two faller bars 1 in a chain drafting system 8 with a chain (not shown). The distance t between the longitudinal axes 6 of the support bars corresponds to the so-called chain spacing in the chain used in the chain drafting system 10. The chain spacing of the preferred chain used is t=9.525 mm.

FIG. 4 shows the arrangement of a number of faller bars 1 in a chain drafting system 8 of a textile machine having two chains 9. The letter A denotes the feed direction of the chain drafting system 8. At the end of the chain drafting system 8 are located a take-off roller 10 and two further rollers 11, 12 for feeding the material being processed by the textile machine, which is not shown in more detail.

The pins 3 of the faller bars 1 used in the chain drafting system 8 penetrate into the material being processed up to the delivery point v in front of the take-off roller 10. By increasing the pin distance from 2.15 mm to 2.9 mm, the delivery width v in front of the take-off roller 10 is decreased by 0.75 mm. This means that the pins 3 of the faller bars 1 are in contact with the material to be processed for a longer period of time and/or for a greater distance, which in turn improves the quality of the fibrous material being processed.

LIST OF REFERENCE SYMBOLS

• 1 faller bar
• 2 support bar
• 2 shaft
• 2 bearing bore
• 3 pin
• 4 casing
• 4 zone of the casing having the thinnest wall
• 4 rib
• 5 longitudinal axis of the pin
• 6 longitudinal axis of the support bar
• 7 guide groove
• 8 chain drafting system
• 9 chain
• 10 take-off roller
• 11 additional roller
• 12 additional roller
• A feed direction
• D total diameter
• M central line
• a distance, pin distance
• d diameter of the support bar
• m rib thickness
• t chain spacing
• v delivery width

Claims

1-6. (canceled)

7. A faller bar, comprising: a support bar having a diameter of 5.9 mm to 6.1 mm;a casing surrounding said support bar, said casing having a thin-walled zone with a wall thickness of 1.4 mm to 1.8 mm; anda number of pins disposed adjacent to each other and next to said casing.

8. The faller bar according to claim 7, wherein said support bar has an under side and said thin-walled zone being on said underside opposite to said pins and extends at least over half a circumference of said support bar.

9. The faller bar according to claim 7, wherein: said support bar has a longitudinal axis; andeach of said pins has a longitudinal axis, a distance between said longitudinal axis of each of said pins in relation to said longitudinal axis of said support bar is greater than 2.15 mm.

10. The faller bar according to claim 9, wherein said distance is between 2.6 mm and 2.9 mm.

11. The faller bar according to claim 9, wherein said distance is 2.75 mm.

12. A chain drafting system for a textile machine, the chain drafting system comprising: at least two transport chains each having a number of faller bars, each of said faller bars including: a support bar having a diameter of 5.9 mm to 6.1 mm;a casing surrounding said support bar, said casing having a thin-walled zone with a wall thickness of 1.4 mm to 1.8 mm; anda number of pins disposed adjacent to each other and next to said casing.

13. The chain drafting system according to claim 12, wherein said support bar has a longitudinal axis, a distance between said longitudinal axis of two adjacent said support bar of said faller bars defining a chain spacing being 9.525 mm;wherein each of said pins has a pin longitudinal axis; andfurther comprising a delivery width being reduced in a direction of a take-off roller by an amount corresponding to a given distance between said longitudinal axis of each of said pins to said longitudinal axis of said support bar.