Patent GB-805036-A (GB)
Title: Control device for material removing means used for the dynamic balancing of revolving workpieces
IPC: G01M1/22
Filed: 1955-05-07
Abstract: 805,036. Electric measuring systems. AVERY, Ltd., W. & T. (Schenck Maschinenfabrik G.m.b.H., C.). May 7, 1955, No. 13268/55. Class 40 (1). In a dynamic balancing machine wherein the location of the unbalance of a testpiece is determined with the aid of one or more reference phase generators, the rotor or rotors whereof are adapted to be driven in synchrony with the testpiece and the stator or stators whereof are rotationally adjustable, a control device is provided whereby the testpiece can be brought into register and locked with respect to the stator or stators to admit of the testpiece being subjected to an unbalance compensating machining operation at an angular location or locations determined by the angular setting of the stator or stators. The testpiece 1 is mounted, for rotation, on a shaft 3 which carries a pulley 4 driven from a motor 16. A coupling 5 connects the shaft 3 with a phase reference generator 6 used to detect the position of unbalance in the testpiece. The stator of generator 6 can be rotated in bearings 9 by a manually-operated worm drive 8 whereby the angular position of the stator can be brought into a given angular relationship with the angular position of maximum unbalance of the rotating testpiece which stator position is indicated to the operator by a maximum or minimum signal from, say, a wattmeter comparison of the unbalance signal derived from unbalance-responsive pick-up devices coupled to the testpiece with the A.C. voltage derived from the phase generator 6. A sleeve 10 is secured to the stator of generator 6 for rotation therewith and a flanged collar 11 is keyed to the sleeve for rotational and axial movement therewith, being biased to the left as viewed in the Figure by a spring 14 and conical-ended pins 13 are mounted on flange 11 to register with notches 15 provided on the face of belt pulley 4, when the flange is moved against spring 14 by a lever 18 operated by an electromagnet 17. The circuit to the electromagnet 17 is completed through a manually or centrifugally-operated switch 7b and leads 7a, each connected to a brush X mounted on the stator of generator 6 and a conducting arm Y mounted on the end of rotor shaft 6a. During the unbalance measuring run testpiece 1, pulley 4, rotor of the phase generator 6 and the arm Y of switch 7 revolve synchronously and by the aid of a wattmeter the stator is rotated by device 8 to determine the position of unbalance in the testpiece. The balancing machine is then stopped and the operator rotates the testpiece by hand with switch 7b closed until circuit 7a is completed through switch 7 to energize electromagnet 17 and engage pins 13 in the notches 15 which place testpiece 1 in the correct angular position for balancing machining by the drill 19. In a further embodiment, Fig. 2 (not shown), provision is made to drill the testpiece in two complementary planes and a warning light is provided to indicate when the testpiece has been manually rotated to its correct position for drilling. In this embodiment a single-phase generator is used but in a further embodiment (Fig. 3, not shown), one phase generator is provided for each of two balancing planes. Specification 744,295 is referred to.