JOURNAL of the JAPANESE SOCIETY of AGRICULTURAL MACHINERY

[title in Japanese]

1960 Volume 22 Issue 1 Pages 1-2
Published: June 30, 1960
Released on J-STAGE: April 30, 2010

DOIhttps://doi.org/10.11357/jsam1937.22.1

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A Comparative Test of Air Cooled Gasoline Engine and Air Cooled Diesel Engine

Y. TAMURA

1960 Volume 22 Issue 1 Pages 3-4
Published: June 30, 1960
Released on J-STAGE: April 30, 2010

DOIhttps://doi.org/10.11357/jsam1937.22.3

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Study on the Screw Type Blade (III)

On the Two-Dimensional Cutting by Screw Blade

K. MIYAKITA, Y. DOI

1960 Volume 22 Issue 1 Pages 5-10
Published: June 30, 1960
Released on J-STAGE: April 30, 2010

DOIhttps://doi.org/10.11357/jsam1937.22.5

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It is necessary for us to decrease the consumption of energy by theoretical study on the tilling resistance, specially cutting resistance, using screw blade. For this study we assumed the soil-cutting to be the two-dimensional instead of three, and the soil to be broken to pieces along the plane of maximum shearing stress as the mechanism of soil cutting. Thus we gained the mean value of cutting power in region that was cut afresh in addition to the cutting resistance. As result of this analysis we came to the conclusion that the mean value of cutting power increased rapidly with increment of φ—an angle between a blade and a tangent of base circle—.
Accordingly we gained the conclusion that φ had to be small for decreasing cutting power.

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Studies on Soil Structure in Relation to Sizes of Harrowed Clods and Aggregation

S. YAMAZAWA

1960 Volume 22 Issue 1 Pages 11-16
Published: June 30, 1960
Released on J-STAGE: April 30, 2010

DOIhttps://doi.org/10.11357/jsam1937.22.11

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The writer made these studies with a view to find out reasonable puddling method by mechanical power, and also to define the interrelation between the sizes of harrowed clods and the growth of paddy plants in an ideally builtup soil structure that would give the richest harvest, by making researches into the plant growth in each stage, the statistical samples of harvested crops, the degree of aggregation, and so forth, together with the vicissitude in each of these subjects.
It was disclosed that clayey-loam clods ranging from 0.5cm to 1cm and light-clay clods from 1cm to 2cm give best results, and that the number of aggregations is clearly proportionate to the growth of plants and forthcoming harvest.
It was witnessed that the highest degree of aggregation was brought about during the prime of the growing period, and the lowest during the milky stage. It was also ascertained that the ignition loss and E_h of soil are related to the changes in the degree of aggregation.

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Studies on the Friction Loss in High Speed Duster Fan Pipe

R. TAKEUCHI

1960 Volume 22 Issue 1 Pages 17-20
Published: June 30, 1960
Released on J-STAGE: April 30, 2010

DOIhttps://doi.org/10.11357/jsam1937.22.17

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The author measured the consumed output horsepower of High speed duster fan and in its blowing pipe by using the electric dynamometer. A compared relationship between the wind velocity in pipe line and pressure loss. From these results, the optimum pipe length was 2-4m when fan velocities were 2000-6000r. p. m.
On the term of pressure drop and loss in the pipe, the pure loss must within 100mm Aq. Moreover, the suitable range of wind velocities are 25-30m/s, namely, revolutions of fan are 4000-4500r. p. m.

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[title in Japanese]

1960 Volume 22 Issue 1 Pages 20-20,29
Published: June 30, 1960
Released on J-STAGE: April 30, 2010

DOIhttps://doi.org/10.11357/jsam1937.22.20

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Studies on The Hulling Action of Rubber-roll Typed Rice Huller (I)

M. SONOMURA, N. KAWAMURA

1960 Volume 22 Issue 1 Pages 21-24
Published: June 30, 1960
Released on J-STAGE: April 30, 2010

DOIhttps://doi.org/10.11357/jsam1937.22.21

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The rubber-roll type rice huller consist of a pair of rubber-rolls which are set with narrow clearance and rotate with different speeds. Paddy rice fed to the clearance between rolls are husked by the contacting pressure of paddy and rolls, and by the frictional force caused by the speed difference of rolls. As a fundamental study, in this paper, we offer an analysis of hulling action of the rubber-rolls with regard to viscoelastic properties of rubber and to paddy shape.
Contacting pressure between the roll and paddy change in a short period. The maximum value of pressure occur at the upper part of the narrowest clearance of rolls (Fig. 4) Factors concerning husking, such as speeds, speed difference, clearance and diameters of rolls, and the size and feeding direction of paddy are discussed.

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The Research of Sifting Theory of Grain Sorter (XI)

The Summary of These Reports

Y. MIYOSHI

1960 Volume 22 Issue 1 Pages 25-26
Published: June 30, 1960
Released on J-STAGE: April 30, 2010

DOIhttps://doi.org/10.11357/jsam1937.22.25

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In this report, I mentioned the summary of the reports I had already offered. These reports were made theoretically and confirmed by many experiments.
I believe that they can give the bases to the existing empirical knowledge and contribute some suggestions in disigning and operating of grarin sorters.

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[title in Japanese]

[in Japanese]

1960 Volume 22 Issue 1 Pages 27-29
Published: June 30, 1960
Released on J-STAGE: April 30, 2010

DOIhttps://doi.org/10.11357/jsam1937.22.27

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[title in Japanese]

1960 Volume 22 Issue 1 Pages 30-32
Published: June 30, 1960
Released on J-STAGE: April 30, 2010

DOIhttps://doi.org/10.11357/jsam1937.22.30

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