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Volume 26 (1964 - 196･･･
- Issue 4 Pages 213-
- Issue 3 Pages 149-
- Issue 2 Pages 75-
- Issue 1 Pages 1-
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Volume 26, Issue 2
Displaying 1-18 of 18 articles from this issue
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Speed Response by Simple LoadS. UMEDA1964 Volume 26 Issue 2 Pages 75-78
Published: September 30, 1964
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThis paper presents the results of the speed control characteristics of the engine set on farm tractor under simple drawbar pull without weight transfer.
The speed response of engine is affected by the gear ratio and the condition of running surface, especially the coefficients of damping are much varied by the condition of running surface.View full abstractDownload PDF (568K) -
Y. YASUDA, J. DOI1964 Volume 26 Issue 2 Pages 79-83
Published: September 30, 1964
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSDirectional stability of travelling tractor with pneumatic tires depends upon the moment due to driving force difference at the rear axles and the lateral thrust or cornering force acting on the tread of steered wheels. Cornering force of a 32ps tractor was studied by measuring the driving torque independently at left and right axles, giving some finite angle of steering with locked differential power transmission device. Upper part of the figure 3 represents the rolling resistance R and lower part the cornering force F with respect to steering angle φ. Solid line shows calculated result from the average value of cornering force using R=R0+F×tanφ, where R0 is initial rolling resistance or rolling resistance for the neutral angle of steering.
Cornering force and rolling resistance increase accordingly with increase of the steering angle, however, the former tends to an final value of 40% of normal load and the latter increases up to about 7 times of the initial value and that is equal to 60% of the load. As the cornering force due to side slip of steered wheels results loss of drawing power, directional stability should be maintained by the torque difference at the left and right driving axles using locked differential gear.View full abstractDownload PDF (792K) -
Previous Field Test of Subsoiler ModelsS. MORISHIMA, M. MATSUO1964 Volume 26 Issue 2 Pages 84-88
Published: September 30, 1964
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThe power requirements and soil breaking characteristics of the Bull-Deeper on the market and the models of subsoiler which were mounted on the two wheel walking tiller without a rotary part were studied.
The results were as follows:
1. A gradual increase in draft occured with an increase in cutting angle and cutting width, and the draft increased suddenly with the depth by the influence of hard subsoil.
2. The draft of the Bull-Deeper was greater than that of the tentatively produced subsoiler models of the same mean cutting angle because of the difference between both shapes.
3. Some differences were observed between the Bull-Deeper and the models of subsoiler with respect to the characteristies of soil breaking and the amount of soil surface rise. The hole like conduit appeared along the trace of blade movement in the case of V shaped subsoiler. Therefore, it is considered that the effects of drainage and soil breaking would be greater than that of the Bull-Deeper.
4. From the results of measuring on the shapes of the Bull-Deeper, it was found that it has unrational shape when it is used for subsoiling only, except it is used after rotary cultivating.View full abstractDownload PDF (2858K) -
T. FURUCHI1964 Volume 26 Issue 2 Pages 89-98
Published: September 30, 1964
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSIt is necessary that row profile of wheat adapts to working width and characteristics of the machines to be used to carry out paddy direct seeding with both few processes and good working accuracy after harvesting of wheat.
If the rotary tiller and the seeder (working width are both 60cm) are used, proper row profile are the row of 60 to 70cm wide or the flat row, and wrong row profile is the traditional row of 100 to 150cm wide. In the case of the row of 60 to 70cm wide or the flat row, the rotary tiller could level a row with one pass and the rotary seeder can seed paddies directly without tilling process.View full abstractDownload PDF (5883K) -
Y. CHUMA1964 Volume 26 Issue 2 Pages 99-104
Published: September 30, 1964
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThe authors have conducted some experiments connecting upon the faculty of earth drilling machine.
Some results from our earth drilling tests by means of a new experimental device, equipped with a torque pick up, are expressed.
(1) Total drilling torque to dig the hole into the earth may be considered to be expressed as follows:
T=Tf+(Ta+Tm+Ts)×1/η×i≤Te
where T: total earth drilling torque, kg-m
Tf: driving torque of flexible shaft itself, kg-m
Ta: driving torque of auger itself on no load, kg-m
Tm: torque influenced by moving conditions of auger such as penetrating and peripheral speed under the ground, kg-m
Ts: torque influenced by soil conditions such as the hardness, moisture content, roots and gravel, and others under the ground, kg-m
η: mechanical efficiency of machine
i: reduction ratio
Te: required mean torque of engine, kg-m
(2) Torque requirements of flexible shaft increased with the degree of bending were measured. (Fig1-4).
The torque diagrams of flexible shaft repeat complicated periodic cycle according to the bending, radius of curvature and rpm etc.
The inverse torque (minus torque) occured at the bending of 90°, 120° (Fig 5)
(3) The torque of earth drill increases as the weight fixed upon handle does. (Fig7-(1)).
The drilling speed of earth drill is influenced by the weight x
y=0.0121x+1.36075
where y: drilling speed into the earth, (cm/sec)
x: total weight mounted on an auger, kg.
(4) The comparison of the reacting torque between the different size of auger may be considered to be expressed by following relation:
TL=K×(RL/RS)2×TS
where TL: reacting torque of the larger auger (radius of the auger is RL)
TS: reacting torque of the smaller auger (radius of the auger is RS)
K: constant, (K=0.97, using total mean torque in this experiment)
The reacting torque appears sensible according to the existence of obstacle in the earth, and often occurs beyond the theoretical value.View full abstractDownload PDF (3286K) -
S. MURATA1964 Volume 26 Issue 2 Pages 105-110
Published: September 30, 1964
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSA precise definition of missing hill in beet cultivation was established, and the mathematical formulas were derived to express the relationship among the rate of missing hill, the seeding method, the field emergence rates and the seeding rates.
In application of these formulas, a new method for determination of the best seeding rate and the best reducing rate for mechanical thinning were found.
It was mathematically proved from the formulas that the most important seeding conditions required for mechanical stand reduction with a complete successfulness should be as follows:
1) using of mono-germ seeds
2) precision drilling
3) having field emergence rates of 72 to 100 per centView full abstractDownload PDF (1124K) -
I. NISHIMURA1964 Volume 26 Issue 2 Pages 111-113
Published: September 30, 1964
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSStudying the relation between the structure of farm-use nozzle (Scale Model) and its discharge coefficient and spray angle, the auther found that the relation could be expressed by following empirical formula-parabolic change for discharge coefficient and hyperbolic change for spray angle.View full abstractDownload PDF (377K) -
T. OKAMURA, Y. TAKASAKI, M. ITO1964 Volume 26 Issue 2 Pages 114-120
Published: September 30, 1964
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThe field studies on the hay crusher, the rotary tedder, and the sidedelivery rake were made to get faster field curing in Sapporo, Obihiro, and Nemuro where the weather conditions are the worst in Hokkaido. Several results obtained by the present study were as follows:
(1) The hay crusher was effective to get faster hay curing under the various weather conditions, and, generally speaking, the days for field curing may be shortened about one day.
Though the crushed hay absorbed more water than the uncrushed hay under rainy condition or at night, the crushed hay lost water faster than the uncrushed hay.
(2) Two times of tedding by the tedder (wuffler) showed the same curing effect as crushing by the hay crusher. Generally speaking, tedding in the morning was more effective than that in the evening.
(3) It was more effective to use both hay crusher and rotary tedder, and it was evident for the hay wet by the rain.
(4) To make the windrow by a side delivery rake for the hay of which water content was less than 50% was usefull under the same condition. One of the applications of the side delivery rake was making the windrow to keep the hay from the damage of heavy mist at night.View full abstractDownload PDF (1122K) -
On the Adequate Utilizing Time of a Combine for RiceH. KIKUCHI, M. SAKAI1964 Volume 26 Issue 2 Pages 121-122
Published: September 30, 1964
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSA series of field experiments was performed intermittently in October to clarify the change of performance of a Japanese small combine (width of cutterbar 0.69m) in relation to progress of ripeness of rice plant. Results obtained may be summarized as follows:
1. As ripeness of rice plant progresses, the percentage of field loss of grain increases. Especially after the time of full ripeness, increasing tendency of field loss becomes remarkable. (Fig. 1)
2. As to items of field loss, the percentage of threshing loss is more than that of head loss, in the early stage of ripening but the latter becomes superior to the former in proportion to the progress of ripening. (Tab. 4).
3. From a viewpoint to minimumize field loss in the utilization of a combine, the adequate harvesting time of rice plant may be a period from later stage of yellow ripeness to the beginning of dead, which is later and shorter than the conventional harvesting time by a hand sickle.View full abstractDownload PDF (324K) -
[in Japanese]1964 Volume 26 Issue 2 Pages 123
Published: September 30, 1964
Released on J-STAGE: April 30, 2010
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[in Japanese]1964 Volume 26 Issue 2 Pages 124
Published: September 30, 1964
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSDownload PDF (2033K) -
[in Japanese], [in Japanese], [in Japanese]1964 Volume 26 Issue 2 Pages 125
Published: September 30, 1964
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSDownload PDF (160K) -
[in Japanese]1964 Volume 26 Issue 2 Pages 126
Published: September 30, 1964
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSDownload PDF (157K) -
[in Japanese], [in Japanese]1964 Volume 26 Issue 2 Pages 127
Published: September 30, 1964
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSDownload PDF (149K) -
[in Japanese]1964 Volume 26 Issue 2 Pages 128-133
Published: September 30, 1964
Released on J-STAGE: April 30, 2010
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[in Japanese]1964 Volume 26 Issue 2 Pages 134-139
Published: September 30, 1964
Released on J-STAGE: April 30, 2010
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1964 Volume 26 Issue 2 Pages 139
Published: September 30, 1964
Released on J-STAGE: April 30, 2010
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1964 Volume 26 Issue 2 Pages 140-144
Published: September 30, 1964
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSDownload PDF (789K)
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