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Volume 35, Issue 1
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Part 1: Effect of Air Pressure, Air Flow Rate, Yarn Speed and Feed Ratio on Number of Tangles, and Limit for Processing Interlaced YarnYoshiyuki Iemoto, Shigeomi Chono, Kichidayu Sawazaki1989 Volume 35 Issue 1 Pages 1-5
Published: 1989
Released on J-STAGE: October 24, 2006
JOURNAL FREE ACCESSEffect of air pressure, air flow rate, yarn speed and feed ratio on the number of tangles is investigated. The relation between limit for processing interlaced yarn and factors above mentioned is clarified. Results obtained in this experiment are as follows:
(1) The number of tangles N increases as the air pressure p goes up and reaches the maximum at p=4.5kg/cm2. The value of N decreases rapidly over p=4.5kg/cm2.
(2) Effect of air flow rate G on N is almost the same as that of p.
(3) The value of N decreases monotonously with the increase of the yarn speed v.
(4) The maximum N changes with the feed ratio F. The value of F which makes N maximum varies on experimental conditions.
(5) Limit for processing interlaced yarn becomes narrow with the increase of v. When v is constant, only one combination of p and F gives the maximum value of N.View full abstractDownload PDF (684K) -
Ikuko Hirai, Toshihiro Gunji, Kazuo Maie, Tadatoshi Yamada, Shiro Kond ...1989 Volume 35 Issue 1 Pages 6-9
Published: 1989
Released on J-STAGE: October 24, 2006
JOURNAL FREE ACCESSThe characteristics of walking on carpets were inverstigated from the view point of lower limb muscle activities. Electromyograms of Musculus rectus femoris, M. tibialis anterior, M. gastrocnemius, and hamstring muscles of twelve female college students were recorded during the natrual walking on four kind of carpets-nylon loop pile carpet with or without jute underlay, wool cut pile carpet with or without jute underlay-and PVC tiles. The beginning point, the end point, and the duration of each muscle contraction were analysed by F-test, and it was found that the differences among the subjects were larger than those among the carpets. Similarly to our previous conclusion, it is concluded that the natural walking is not changed by the kinds of carpets from the view point of lower limb muscle activities and ground reaction forces.View full abstractDownload PDF (538K) -
Kazuko Tamura, Michikazu Tanaka1989 Volume 35 Issue 1 Pages 10-14
Published: 1989
Released on J-STAGE: October 24, 2006
JOURNAL FREE ACCESSThe operation of hands on the sewing of curved line by electric sewing machine is importance. As the operation of hands is a delicate for the beginners, they need an apt training curved line. This study developed five sorts of exponential curved lines which resemble the pattern of sleeve top, and investigated about the sewing ability of female students using them.
The results were summarized as follows.
1) The miss score-The sewing velocity diagrams were drawn from the experimental results.
2) It was found from the above diagrams that the sewing velocity of experts at sewing when they sewed sharp curved lines (9cm, 12cm, 15cm wave height) by elctric sewing machine were much the same as foot pedal sewing machine's.
3) Unskilled students sewed sharp curved lines fast. Therefore they were tired very much and their miss scores were increased.
4) To practice the sewing using a gentle curved line (3cm wave height) have much effect on unskilled adult women.View full abstractDownload PDF (597K)
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