Showing papers in "Mechanism and Machine Theory in 1979"

TL;DR: The linkages due to Bennett, Goldberg and Myard have passed into the classical literature, despite the considerable misconceptions still associated with them as mentioned in this paper, and the authors of this paper set out to completely clarify the linkages and the various relationships, including the derivation of comprehensive closure equations.

TL;DR: A general method of structural synthesis which can be used to derive all possible simple- and multiple-jointed chains of positive, zero or negative degree-of-freedom is presented.

TL;DR: Two new methods for setting dynamic equations of active spatial mechanisms through Lagrange's second-order equations and a new version of the method based on Appel's equations are considered.

TL;DR: A review of the published papers in the area of vibratory jump conveying can be found in this article, where the authors present a survey of the literature on vibratory conveying.

TL;DR: In this article, the authors present synthesis techniques for planar 4-bar linkages with adjustable driven crank pivots for different motion generation problems, including P 1 - P 2 - P 3 : P 1- P 4 - P 5 case.

TL;DR: In this paper, a simple expression for the input torque of an inline force-balanced 4-bar linkage is derived, and the relationship between input torque, shaking moment, and moment of ground bearing forces is discussed.

TL;DR: The common basic features of the method for automatic setting of dynamic equations of active spatial mechanisms in the form of open chains are presented and the comparison of the three method's efficiency is given.

TL;DR: In this paper, the authors show 4-bar, 6-bar and 8-bar planar mechanisms with force transmission irregularities in which an unbalanceable shaking force is generated by a link or by a group of links that have connections to the fixed link through pairs permitting linear freedoms only.

TL;DR: In this paper, points at which contact is lost at the coupler-rocker connection of a 4-bar linkage are predicted using an empirical method which relies on a simple no-clearance analysis, and are compared with results from an analysis which takes bearing clearance into account and with experimental results.

TL;DR: A computer program is described which, using as an input the polar coordinates of the real profile, gives as output the lift and accelaration laws of planar cams.

TL;DR: In this article, a mechanism with negative spring stiffness is discussed, in which the action is based on the instability of the second order buckling state of a flat plate spring clamped at both ends.

TL;DR: This technique is applied to the synthesis of a planar 4-bar function generating mechanism and a spherical mechanism with minimum structural error and the programming adapted here deviates from the present concept of G P.

TL;DR: A spring model analysis for the load distribution in chains and in sprocket teeth and compares the results with those from a traditional force-balance analysis which does not include a consideration of elastic properties is presented.

TL;DR: In this paper, an extension to the theory of force balancing planar linkage mechanisms is presented, which incorporates a technique for checking whether a linkage can be fully force-balanced using counterweights alone, and a formula that defines the minimum number of counterweights needed for a full force-balance.

TL;DR: In this paper, closed form equations are developed for the synthesis of the 4-bar crank-rocker mechanism in which the angle between dead-centre positions of the rocker and the corresponding angle turned by the crank are prescribed.

TL;DR: In this article, the problem of optimal design of mechanisms for minimum mechanical and structural error is formulated as a stochastic programming problem, where the nominal link lengths, the tolerances on link lengths and the clearances in joints are considered as design parameters.

TL;DR: In this article, the Selective Precision Synthesis (SPS) technique has been extended to include the synthesis of mechanisms whose tracer points satisfy velocity as well as position specifications.

TL;DR: In this article, the dimensions of planar 4-bar linkages are mapped onto finite regions of three-space, in order to provide parameters of value in selecting linkage dimensions to meet design requirements.

TL;DR: In this paper, the human hand prehension in planar and spatial configurations was studied and it was shown that a three points contact in the plane and a five points contact on the space of an object of generic shape is sufficient to ensure prehensions.

TL;DR: In this paper, the analogies with articular and muscular mechanics of human limbs are pointed out, and a mathematical model with a computer program aids the study of kinematics and dynamics of the mechanical hand.

TL;DR: Most single-loop 4-bar overconstrained lower-paired linkages with mobility one have now been isolated and the E-chain is made amenable to analysis, using closure equation algebra and the spherical indicatrix.

TL;DR: In this paper, a method to determine the elasticity of the retainer spring or follower train for minimum flexibility error or optimum sensitivity is described, and numerical examples are included to illustrate the applications.

TL;DR: The aim of this paper is to introduce a method that enables the mathematical model automatically with the aid of a computer using only basic information about dimensions and variables.

TL;DR: The emphasis of this paper is the use of computer aided algebraic and symbol manipulation requiring only the equations for the cam profiles and other analytic information as input, and the exact constitutive equations are generated and used as opposed to approximate methods such as replacement mechanisms.

TL;DR: In this article, a 6-bar linkage giving parallel motion in an orbit through five given points is synthesised, which deviates from a required orbit at other points by local minima.

TL;DR: A straightforward design of a luffing-crane mechanism and a graphical construction of a special mechanism which generates two mutually orthogonal straight lines are presented to further illustrate the general versatility of the proposed method of synthesis.

TL;DR: In this article, a general method for the synthesis of path approximation mechanisms is presented, which is based on matrix algebra and is adjusted for use with a digital computer and is made on the one-loop spatial mechanism with seven links having constrained motion.