Development of A New 2-DOF Wrist Mechanism using Reverse Motion Transmission

Author(s):  
Hyunhwan Jeong ◽  
Hyunseok Shin ◽  
Byung-Ju Yi
Keyword(s):  
2020 ◽  
Vol 46 (2) ◽  
pp. 232-237 ◽  
Author(s):  
Shunsuke Kimura ◽  
Arata Ebihara ◽  
Keiichiro Maki ◽  
Miki Nishijo ◽  
Daisuke Tokita ◽  
...  

Author(s):  
И.Е. СУРИКОВ

В качестве факторов, способствовавших нарастанию варваризации в Афинах второй полвины V в. до н.э., в статье указываются создание Афинской морской державы, движение софистов, конфликт поколений, Пелопоннесская война, наступление «эры демагогов». Обратное же движение в сторону деварваризации (с самого конца Vв. до н.э.) было связано в первую очередь с возрождением уважения к законности, с укреплением стабильности и порядка. Новая афинская демократия IV в. до н.э., которую одни специалисты считают «усовершенствованным» вариантом по сравнению с демократией предшествующего столетия, а другие, напротив, ее упадком, кризисом, была в основном свободна как от охлократических, так и от олигархических тенденций; она может с полным основанием быть определена как умеренная демократия, в отличие от радикальной демократии второй половины V в. до н.э. Конфликтов не то чтобы не было, но их старались разрешать мирным путем, по возможности достигая компромисса и избегая насилия. The article cites as factors, which promoted the growth of barbarization in Athens in the last half of the 5thcentury B.C., the following ones: the emergence of the Athenian Empire, the sophistic movement, the conflict of generations, the Peloponnesian War, and the coming of the “era of demagogues”. As to the reverse motion towards debarbarization (from the very end of the 5th century B.C.), it was connected, in the first instance, with revival of the lawfulness’ authority and with strengthening order and stability. The new Athenian democracy of the 4thcentury B.C. (which is considered by some scholars an “improved” version as compared with democracy of the previous century, but by other scholars, on the contrary, its decline and crisis) was in general free from both ochlocratic and oligarchic tendencies; it may be with good reason defined as a moderate democracy, as distinct from the radical democracy of the last half of the 5thcentury B.C. It is not to say that there were no conflicts, but people sought to solve them by peaceful way, as far as possible, to reach compromises and to avoid violence.


2019 ◽  
pp. 99-106
Author(s):  
A.A. Dobrodeev ◽  
◽  
K.E. Sazonov ◽  
I.A. Sapershteyn ◽  
◽  
...  

2019 ◽  
Vol 18 (3) ◽  
pp. 223-232
Author(s):  
A. V. Glebov ◽  
G. D. Karmaev

Results of the analysis of scientific, technical and patent literature show that while having a great variety of constructive implementation of the proposed catchers there are no efficient and sufficiently reliable devices for catching conveyor belts at its reverse motion which are relatively simple in design. This is proved by practical activity of enterprises involved in extraction and processing of commercial minerals and other industries. A new design of a conveyor belt catcher that meets most requirements for the given equipment has been developed at the Institute of Mining, Ural of Branch of the Russian Academy of Sciences and then it has been tested under industrial conditions. The design makes provision for retention of the conveyor belt at its reverse motion beyond free edges from transported material. Catching devices are installed on both sides of the belt. Braking action of the belt at the reverse motion occurs due to its friction interaction with a catcher friction shoe located above the belt, and an eccentric mounted on the frame under the belt. A friction shoe is made with a concave curved surface facing the belt. The paper presents a calculation methodology of main parameters for the proposed design of catcher conveyor belts that permits to determine a force catching a conveyor belt down and for every braking period distance which has been passed by the belt, value of its compression, value of braking force, braking time and acceleration of belt motion, time and length of the distance passed by the belt to its full stop, parameters of a catcher and supporting structures, and other parameters. The paper also provides results of calculations for main design parameters of catching devices with an inclined conveyor having a belt width of 1400 mm for two catcher design versions: with location of an eccentric under the belt, and a brake shoe over the belt (option I) and with location of the eccentric over the conveyor belt, and the brake friction shoe under the belt (option II).


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