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Volume 31, Issue 4
Displaying 1-9 of 9 articles from this issue
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Fumio Murakami, Teruo Watanabe, Hideaki Tazaki, Hiroyuki Goto1978 Volume 31 Issue 4 Pages T60-T66
Published: April 25, 1978
Released on J-STAGE: October 27, 2009
JOURNAL FREE ACCESSIn some textile machinery, e. g., sizing and beaming machine, a sheet of yarns is unwound from a beam. Since the beam revolves against forces due to braking and moment of inertia of a beam, the dynamic tension is applied onto yarns. The dynamic tension fluctuates according to the damped oscilation behaviour. The fluctuation of the yarn tension is described by asecond-order differential equation with constant coefficients using some approximations.
This paper deals with the dynamic yarn tension during unwinding from a beam popular in Japan. The result will contribute to the improvement of the operation method for aloom.View full abstractDownload PDF (794K) -
Part 1 : Measurements of an Air Velocity D istribution in a Modified R otorAkira Horikawa, Osamu Yaida, Nobuharu Mimura, Toru Hamada1978 Volume 31 Issue 4 Pages T67-T73
Published: April 25, 1978
Released on J-STAGE: February 12, 2010
JOURNAL FREE ACCESSTo investigate the air flow behaviour in an open-end spinning rotor, at the first stage, the direction and distribution of an air flow have been determined in a modelled rotorwhich is, in size, twice as large as the practical ones. The effects of spinning conditions, i.e., number of air exhausting holes, rotor speed, etc. on an air flow behaviour have also been observed by determining the distribution of the static pressure, that of radial angle, and tangential velocity. The experimental results were summarized as follows :
1) A nearly equal static pressure was obtained on the same radius in the rotor.
2) The pressure gradient near the rotor center and near the rotor wall was smallerthan that of the other parts.
3) The tangential velocity of the air flow was equal irrespective of the measured plane, the rotor velocity, and the number of exhausting holes.
4) While the forced vortex motion was observed by the rotor rotation near both therotor axis and the outer wall, the free vortex motion was observed between these regions.
5) The angle distribution in the direction of the radius was equal irrespective ofthe measured plane, the rotor velocity, and the number of exhausting holes.View full abstractDownload PDF (745K) -
Y. Kawachi1978 Volume 31 Issue 4 Pages P158-P164
Published: April 25, 1978
Released on J-STAGE: October 27, 2009
JOURNAL FREE ACCESSDownload PDF (2076K) -
Junko Akashi, Junko Nishikawa, Mutsuo Okuno, Koji Matsumoto1978 Volume 31 Issue 4 Pages P165-P171
Published: April 25, 1978
Released on J-STAGE: February 12, 2010
JOURNAL FREE ACCESSPhotographic pictures have been taken of “flagging” and “thread looping” of five kinds of fabrics to investigate how the flagging affects thread looping.
The pictures have shown that :
(1) A form of loop agrees well with a lemniscate in width and length, if no flaggings occur.
(2) An extreme flagging prevents a sewing thread from looping, and causes skipping stitches.
(3) An extreme flagging may also cause fabric gatherings, because the fabrics to be sewn is fed by the feed dog, being pulled up around the needle hole of the throat plate.View full abstractDownload PDF (15153K) -
Ikuko Ueno, Michikazu Tanaka1978 Volume 31 Issue 4 Pages P172-P176
Published: April 25, 1978
Released on J-STAGE: October 27, 2009
JOURNAL FREE ACCESSAn attempt has been made to investigate, in straight lockstitch seams, the relationships between the length of the sewing thread to be consumed and sewing conditions, i.e., thread thickness, stitch density and fabric thickness.
If a sewing thread is exhausted during sewing, inseams are occured. These incorrect seams are major reasons for which apparel and shoe manufacturers must discard articles with incorrect seams or sell them as defective articles at the reduced price to bargain hunters. Therefore, the exact length of a sewing thread required along the seam line must be predicted to avoid these troublesomes. The some geometrical stitch models, rectangular or elliptical, have been assumed to calculate the length of the sewing thread required in an apparel manufacturing.
Comparing the predicted values calculated theoretically from elliptical model of stitch with the results obtained from the experiments of sewing thread consumption, some formulae are proposed to calculate the length of the sewing thread to be consumed in straight lockstitch seams.View full abstractDownload PDF (618K) -
T. Eguchi1978 Volume 31 Issue 4 Pages P177-P181
Published: April 25, 1978
Released on J-STAGE: October 27, 2009
JOURNAL FREE ACCESSDownload PDF (4209K) -
[in Japanese], [in Japanese]1978 Volume 31 Issue 4 Pages P182-P184
Published: April 25, 1978
Released on J-STAGE: October 27, 2009
JOURNAL FREE ACCESSDownload PDF (3331K) -
S. Kitaura1978 Volume 31 Issue 4 Pages P185-P190
Published: April 25, 1978
Released on J-STAGE: October 27, 2009
JOURNAL FREE ACCESSDownload PDF (865K) -
Part 1 : Pattern-Information-Processing System of Textile DesignRihei Miyashita, Ryosaku Matsuzaki, Yoshiji Ichimaru, Sotokazu Sanada1978 Volume 31 Issue 4 Pages P191-P199
Published: April 25, 1978
Released on J-STAGE: October 27, 2009
JOURNAL FREE ACCESSTo achive a technological progress in a pattern designing and production field, a pattern-information-processing system of textile design has been completed.
The main features of the system are that :
(1) An original pattern of textile design can be converted into a pattern information tape by a flying spot pattern analyser.
(2) By put this pattern information tape into a mini-computer, an original pattern can be memorized in a magnetic drum memory unit, then the original pattern can be displayed on a color graphic display.
(3) Color changing, retouching and writting-in of an original pattern can be done on the color graphic display by using designer·computer-communicated designing system.
(4) By connecting this computerized pattern designing system into an electronic circular knitting machine, an original pattern of large area (more than 40, 000 stitches) can correctly be knitted in to a fabric.
(5) Only one operator can easily and quickly (within 1 hour) perform works required for from pattern analysing of an original pattern to supplying the complete pattern information for production system.View full abstractDownload PDF (2712K)
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