Showing papers in "Mechanism and Machine Theory in 1980"

TL;DR: The 6-revolute loops, of considerable interest to line geometricians, have been subject to a great deal of misunderstanding, and have never been delineated by appropriate sets of independent closure equations as discussed by the authors.

TL;DR: In this article, an input-output equation of degree 32 in the tan-half-angle of the output angular displacement is expressed in the form of a 16 × 16 determinant equated to zero for the single-loop, single-degree-of-freedom linkage with seven links connected by seven turning pairs arbitrarily oriented in space.

TL;DR: In this article, the relative motion across the clearance, impact and rebound, and restoration of continuous contact in plain unlubricated revolute joints is surveyed, with a focus on motion in continuous contact.

TL;DR: In this paper, a finite element method for kineto-elastodynamic analysis of high speed mechanisms has been presented and the effects of number of divisions have been investigated and it is found that a certain minimum number of division of links is necessary to yield accurate results.

TL;DR: In this paper, a method for determining the relative freedom between links which are separated by cross-jointing is presented, which incorporates quantitative relationships and embraces earlier results, particularly the series and parallel laws of screw system theory.

TL;DR: In this paper, the implicit function system existence of one and two cranks in an overconstrained mechanism has been investigated and the manipulator number of degrees of freedom is not observed.

TL;DR: In this paper, a new analysis procedure for directly obtaining the steady state displacements and stresses within the elastic links of a mechanism is described, which includes the higher order elastic acceleration terms and the effects of axial rigid body forces on the transverse vibrations of the links.

TL;DR: In this paper, a unified treatment of the synthesis of position, path and function generating mechanisms with completely rotatable input links is presented, where algebraic-geometrical techniques are used to obtain all proper crank-rocker and drag-link linkage solutions with transmission angles in the range 45° ≤ μ ≤ 135°.

TL;DR: In this paper, a general theory for calculation of the moments transmitted by an arbitrary universal joint was developed, based on the assumption of a static system with friction, inertia and elastic forces disregarded, was confirmed for two particular cases, the C.V.J and Hooke's joint.

TL;DR: It is shown here that the theory may be applied with equal ease in determining the conditions for uncertainty configurations to be reached in 3-dimensional loops.

TL;DR: In this article, the authors traite du problems de coordination des mouvements d'un manipulateur lorsque l'organe de prehension doit suivre une suite de positions and orientations definies respectivement par trois coordonnees cartesiennes and trois parametres d'Euler.

TL;DR: In this paper, a method of designing nonstandard spur gears with a pinion cutter so that the static bending stresses in the pinion teeth and in the gear teeth are approximately equal was presented.

TL;DR: In this article, a mathematical model is developed for analyzing a 4-bar linkage driven through a speed reducer by a separately-excited d.c. motor, which is derived and converted to dimensionless form.

TL;DR: In this paper, the geometry of the 6-R Turbula is explored and the results obtained are subsequently applied to a very special form of octahedral linkage, the "Turbula" (trade name).

TL;DR: In this paper, a simple analytical procedure is presented for the synthesis of the planar 4-bar double-rocker mechanism for coordinating the prescribed extreme positions, the design criterion used is the equal deviation of the transmission angles from 90° at the two dead-centre positions.

TL;DR: Using the screw theory in the field of infinitesimal displacements, the first and second order transfer functions of spatial kinematic chains are algebrised in this paper, based on this, a method of finite increments of the relative displacements in the joints is offered.

TL;DR: Simulation studies are performed for two different 4-bar mechanisms using separately-excited d.c. drive motors for actuation to obtain generalized, quantitative information for the design of actuator-mechanism systems.

TL;DR: In this paper, it was shown that kinematic inversion does not destroy this property, and the symmetry conditions were expressed in terms of the dimensions of the linkage, producing the symmetrical positions of the line.

TL;DR: Zusammenfassung Zur raschen Synthese von Wattschen Geradfuhrungen vorgeschriebener Lange und Gute werden zwei Nomogramme bereitgestellt as discussed by the authors.

TL;DR: In this article, the authors present the necessary and sufficient conditions for the existence of a single-disk cam with two oscillating rigidly connected roller followers, and the laws of motion that can be achieved are discussed.

TL;DR: In this paper, a slotted link mechanism consisting of a flexibly attached slider is proposed for path generation, where a pointer attached to the slider mass will trace a curve, and an equation of motion for the sliding mass and its solution are developed.

TL;DR: In this article, the authors describe several methods of combining non-circular gears to make an infinitely variable transmission, where the gears are affixed to the bevel and carrier of a differential which may be asymmetrical.

TL;DR: In this paper, a set of sample calculations for the determination of the stresses in the pinion teeth and gear teeth were presented for determining how closely the static bending stress of the pinions and gears are balanced when gears are designed using the cutter offsets determined from the previous paper.

TL;DR: A mathematical model is proposed for the simulation of a particular transmission system constituted by two sliding and rotating elements connected by a constant velocity joint and the dynamics of the system itself is studied, in detail, on the basis of the said model.

TL;DR: In this article, the assembly configuration of a kite 4-bar Watt-1 linkage was derived from the two possibilities that symmetrize the Assembly Configuration containing the four 6-bar curve cognates.

TL;DR: In this paper, a simple mechanism which combines an epicyclic gear train with a 4-bar linkage is proposed, based on simple theory and can develop a function of two independent variables very close to the desired function when iterative methods of solution are employed.

TL;DR: In this article, the authors developed the radii of the gears in a compound gear train of specified length and overall ratio for minimum equivalent inertia, and the resultant equation set that completely solves the problem requires iterative solution, for which a FORTRAN program is supplied.

TL;DR: In this paper, an approach to perform the structural synthesis of industrial manipulators having an open-loop kinematic chain with lower-pair joints is presented, in which the expressions defining anthropomorphic angular and linear displacements between the adjacent links, as solutions of closure equation of corresponding closed-loop mechanisms in the successive positions of the free end along the required spatial track.

TL;DR: In this article, the authors illustrate the results of a systematic investigation to determine the influence which construction and assembly errors have on the law of motion obtained by means of a cam mechanism, with particular regard to the acceleration.