| 摘要 |
PCT No. PCT/CH88/00129 Sec. 371 Date Mar. 30, 1989 Sec. 102(e) Date Mar. 30, 1989 PCT Filed Jul. 21, 1988 PCT Pub. No. WO89/01064 PCT Pub. Date Feb. 9, 1989.Whereas in known needle rings the needles are of circular cross-section, the cross-section of the needles (1) the present needle ring (2) is equipped with is either oval or rectangular with flattened ends, or intermediate between these two shapes. The shorter dimension (1a) of the needle cross-section is to be arranged parallel to the axis of the ring. The needles (1) may be positioned perpendicularly in the ring or form an angle alpha up to 30 DEG with the radius (2b), while the angle beta at the tip should lie between 15 DEG and 45 DEG . The needles sit in round holes (3) the diameter of which is less than the width (1b) of the needles which in turn is approximately 4 to 6 times the thickness of the needles. Hence, the needle does not fully occupy the volume of the hole. Two channels (3b) remain open, which may be used for controlling the air flow effecting the fiber transport. Needle rings of this type have as long a service life as known needle rings with needles of circular cross-section, and hence an appreciably longer service life than the combing cylinders equipped with the so-called all-steel, sets, but in contrast to known needle rollers they can be used in virtually all open-end spinning machines.
|
