Apparatus for turning a body to be balanced into a working position

A method for locating unbalance in a rotary body to be balanced, comprising the steps of:

• mounting the body for rotation about its axis of rotation;
• rotating the body as so mounted;
• determining the angular position of unbalance of the body with respect to a reference position thereof;
• displaying on a screen a mark representing the angular position of unbalance of the body as so determined;
• generating electrical pulses during rotational movement of the body such that the number of pulses generated during given angles of rotation of the body are proportional to such angles of rotation of the body, whereby trains of pulses are generated by rotational movement of the body from said reference position to respective sequential momentary positions thereof and a train of pulses is generated when the body rotates through a complete revolution of the body;
• determining the respective ratios of the numbers of said pulses in the respective trains of the pulses that are generated by rotational movement of the body from said reference position thereof to said sequential momentary positions thereof in relation to the number of pulses generated in said train of pulses during a complete revolution of the body;
• and
• utilizing said ratios to sequentially display respective momentary rotational positions of the body.

Apparatus for rotating a body to be balanced (10) into a working position for correction of unbalance, said body having a reference mark (26) phase-locked thereon, and said apparatus comprising:

• means (12, 14, 16, 18) for rotatably supporting said body and for generating and transmitting unbalance-indicating signals in accordance with forces exerted by reason of the unbalance;
• rotary drive means ( 20, 22, 24) for rotating the body;
• a reference signal generator (28) arranged relative to said body for generating reference pulses during rotation of said body that are indicative of the extent of rotation of said body;
• signal generating means (30) phase-lockingly coupled to said drive means and rotatable conjointly therewith for producing signal pulses indicative of the direction of and the amount of rotational movement of said drive means relative to said reference mark;
• a first indicating device (34) having signal-processing means for receiving said unbalance-indicating signals, said reference pulses, and said signal pulses, and for processing them to produce and to transmit (42) unbalance signals and to produce and to transmit (44) position-indicating signals indicative of momentary rotational positions of unbalance of said body;
• a second indicating device (46) having signal-processing means ( 56, 62, 66, 70) for receiving and processing output signals (42, 44) from said first indicating device to produce and transmit, through control means (58) to electronic display means (48), signals that cause to be displayed visible marks on a display screen of said electronic display means;
• electronic display means (48) in the form of a color cathode ray tube for receiving signals from said second indicating device (46), said tube having a display screen (50) defining a polar co-ordinate system (52) that provides a radial scale having a center (54);
• and
• said signal-processing means of said first (34) and of said second (46) indicating device and said control means serving to produce and feed to said electronic display means (48) signals that cause to be simultaneously displayed, on said screen (50) thereof in color during rotation of said body, visible marks which include a radial finger (68) indicative of the momentary rotational position of said body (10) and a radial finger (72) whose angular position corresponds to the angular position of unbalance, said fingers being displayed in different colors, respectively, that, upon coincidence of said fingers on said display screen (50), result in a visible change of color which is indicative of the working position of said body (10) for correction of the unbalance.