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Volume 18, Issue 4
Displaying 1-3 of 3 articles from this issue
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Tetsuyuki Sasai, Seinosuke Kakiage1972 Volume 18 Issue 4 Pages 101-105
Published: 1972
Released on J-STAGE: October 24, 2006
JOURNAL FREE ACCESSConsidering the scarceness of papers treating of the lateral behaviour of the helical spring of textile materials, in this paper is studied its lateral compressive behaviour when the helical spring is made of heat-set nylon gut.
It has been revealed that the lateral compressive force P per one pitch of the helix can be expressed as follows: P=2(P1+P2-P0) where P1 is the force due to the bending deformation, P2 the force due to the torsional deformation and P0 the negative force due to the original curvature.View full abstractDownload PDF (613K) -
Part 3: Synthesis of SubstreamsMinoru Uno1972 Volume 18 Issue 4 Pages 106-113
Published: 1972
Released on J-STAGE: October 24, 2006
JOURNAL FREE ACCESSThe distribution of air velocity through the weaving shed was studied when substreams were added from outside of the shed on an air-jet loom, in order to get some valuable instructions for improving the weft flying performance. The results are:
1. A simple velocity potential was proposed on the air flow from two nozzles obliquely and symmetrically set against their symmetrical axis. The approximation to the real air flow experimentally obtained was quite good.
2. Two simple pipes were set as above mentioned in the free open air to get the air flow experimentally, from which the optimum angle of nozzle inclination to the symmetrical axis was calculated to get the maximum weft propulsive force. The result shows that the optimum angle is 18 degrees, which, however, should be much lower in case where nozzles are applied to the weaving shed.
3. Air in shed was liable to flow toward the reed. Therefore, both the position showing the highest air velocity in any plane vertical to the shed axis and the weft path shifted gradually toward the reed.
4. Such a nozzle for substream addition was most suitable as its outlet area was wide near the reed and narrow near the cloth fell in proportion to the shed shape, and was composed of many small holes.
5. While flying through the shed, the weft-front was liable to buckle in to a lump. This caused the difference between the weft velocity passing through the main nozzle and the weft-front velocity.View full abstractDownload PDF (1052K) -
Part 4: Length of Main NozzleMinoru Uno1972 Volume 18 Issue 4 Pages 114-119
Published: 1972
Released on J-STAGE: October 24, 2006
JOURNAL FREE ACCESSIn order to fly the weft straight with no crooks, long nozzles were studied to find the following results:
1) So far as the outlet of the yarn guide pipe was downstream of the geometrically joining point of air supplied to the nozzle, the high velocity region effective to accelerate the weft could be wide axially if the yarn were started from the deeper point of a nozzle as long as possible.
2) The demerit of slow speed-up of a long yarn due to a long nozzle could be overwhelmed with the merit of high velocity given by the long duration of yarn acceleration. Velocity higher than 100m/sec could be obtained by the numerical calculation at the exit of a long nozzle.
3) A device to measure the yarn speed photoelectrically without touching the yarn was used to prove that, the deeper the point of yarn start in the long nozzle, the higher the yarn speed when its front end leaves the nozzle.
4) Although the way to measure and express numerically the deviation of yarn passage was devised, it did not verify that the deviation would be smaller if the yarn were started from the deeper point of the nozzle, in case where there were no substreams added from outside of the shed.View full abstractDownload PDF (712K)
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