Patent GB-857250-A (GB)
Title: Oscillating machine
Inventor: ROEDER JOZEF
IPC: B65G27/20
Filed: 1957-05-08
Abstract: 857,250. Jigging conveyers. SCHENCK MASCHINENFABRIK G.m.b.H., C. May 8, 1957, No. 14696/57. Class 78 (1). [Also in Group XXIV] In vibratory mechanism for a conveyer or a conveying screen comprising one or more pairs of separately-driven unbalanced masses which are rotated in the same or in opposite directions and are synchronized by the resultant vibrations, the nature and direction of the vibrations may be variable either by adjusting the axes of the rotating masses or by varying the power supply to the synchronized masses in a pair so as to introduce a phase-shift between them. In one embodiment the machine 50, Fig. 1a, is freely supported on springs 16 and oscillated by a pair of oppositely-rotating unbalanced masses 11, 12 driven by separate motors. If the motor powers are equal the two masses synchronize in phase and produce linear oscillations along a line passing through the common centre of gravity S of the machine taken with half the quantity of material to be conveyed. If the supply of power to the two motors is varied, the unbalanced mass receiving the lower power rotate synchronously with, but is shifted relatively to the outer unbalanced mass, and accordingly the direction of vibration and the speed of conveyance are varied. If desired one rotating mass may be stopped completely to produce an undirected excitation. If it is desired to convey alternately in opposite directions the two unbalanced masses are positioned one above, the other below the floor of the conveyer, and are supplied with different powers. Conveying is then reversed by reversing the motors. It is stated that additional rotating unbalanced masses may be provided to reduce the conveying power. In another embodiment, Fig. 3 (not shown), a pair of unbalanced masses rotating in the same direction are positioned preferably symmetrically near the centre of gravity of the machine. If the driving powers are equal the two masses automatically synchronize with 180 degree phase shift so that they produce only a pulsating moment determined by the distance between their axes. If, however, one of the driving motors is electrically or mechanically braked so as to make the powers unequal, a phase shift occurs between the two unbalanced masses and circular or elliptical oscillations are produced whose amplitude corresponds to the phase shift. In a modification, Fig. 4 (not shown), a pair of unbalanced masses rotating in the same direction are horizontally spaced symmetrically about the centre of gravity and at the maximum possible distance therefrom. If the power supplies are unequal material is conveyed from the centre of the conveyer towards both ends. In a further construction a reciprocating conveyer 50, Fig. 5a, mounted on spring links 56 is oscillated at high frequency and small amplitude by a pair of separately-driven self-synchronizing unbalanced masses 51, 52 rotating in a spring- mounted support 53 which is linked to the conveyer by an articulated rod 54 or by leaf-springs. The support 53 is mounted on four springs 53a, preferably supplemented by counter-stressed springs 53b. Linear oscillations are obtained by rotating the masses in opposite directions. Circular or similar oscillations of the support 53 are attained by rotating the masses in the same direction with different powers, variation of which varies the amplitude of the conveyer. In a modification the masses rotate about vertical axes and the springs carrying the support 53 are removed. A spiral reciprocating conveyer 60, Fig. 6b, supported by springs at the top or bottom, or both, is oscillated by two or four separatelydriven directional exciters, Fig. 6c (not shown), each of which comprises a pair of intergeared oppositely-rotating unbalanced masses. The two exciters synchronize automatically. In a modification unbalanced masses 71b, 72b, Fig. 7b, each forming part of a directional exciter, are coupled by a shaft 75 and driven by a motor 71d. The two other unbalanced masses completing the two pairs are individually driven by motors 71c, 72c and automatically synchronize with the masses 71b, 72b. In another construction a spiral conveyer, Fig. 8b, supported by top and bottom springs 84, or by lateral springs 84a, or by vibration damping connectors, is oscillated by two separatelydriven exciters 81, 82 mounted either at the bottom or part-way up the conveyer, the exciters being angularly adjustable about and along an axis transverse to the conveyer axis to vary the throw and, if required, to reverse the direction of conveying. The conveyer may incorporate screens. In a modification the helical conveyer is replaced by a conveyer having a number of annular troughs disposed one above the other. In another embodiment a spiral conveyer, Fig. 10 (not shown), supported on a ring of inclined spring links is oscillated by a directional exciter comprising a pair of oppositely-rotating unbalanced masses, the exciter being coupled to the conveyer by tubular springs.