1. Adaptive design on crank and slotted lever mechanism
Arup Jyoti Chutia | School of engineering ,Tezpur University
Introduction
Modified design
Other possible arrangement
It’s a quick return mechanism & converts rotary motion into reciprocating motion at different rate for its working & idle stroke. Main objective is to use class-1 lever instead of class-3 . Basically class-3 lever is distance multiplier whereas class-1 is the force multiplier.
Motivation
Use of class-1 lever is helpful to leverage the cutting force.
To obtain flexibility of variation of cutting force and the stroke length.
Angular relationship
Two slotted bar inclined to each other using in the same mechanism to obtain two reciprocating motion simultaneously
Conclusion
Different classes of lever
This modified mechanism is a good alternative. When specially modified slotted bar is used, this mechanism gives the flexibility of variation of developed force F2 with the stroke length within certain limit. Using of class-1 lever in the mechanism is helpful to leverage the effort (F1). Moreover proper construction would give the freedom for more than one motion simultaneously from the same mechanism which would increase productivity rate.
Law of lever
References
By applying moment equation at the fulcrum A, We have, F1L1=F2L2
[1] Wen-Hsiang Hsieh and Chia-Heng Tsai, “A Study On A Novel Quick Return Mechanism‖”, Vol. No. 08- CSME- 13, E.I.C. Accession 3051, September2009.
[2] S.D.Shelare, P.S.Thakare and Dr. C.C. Handa,” Computer Aided Modelling And Position Analysis of Crank And Slotted Lever Mechanism”, Vol No. 1, Issue 5-IJSTR- June2012.
[3] Matt Campbell Stephen S. Nestinger, Department of Mechanical and Aeronautical Engineering, University of California Davis, CA ,―Computer-Aided Design and Analysis Of the Whitworth Quick Return Mechanism‖.
[4] Dr. Harry H. Cheng, ―Computer-Aided Mechanism Design‖ in journal of Mechanical Engineering Science, volume 220, March 14, 2004 .
Existing design
Specially designed slotted bar