Method and apparatus for detecting angular position and amount of dynamic unbalance of rotating body

Claim 5

Apparatus for detecting the angular position and amount of a dynamic unbalance of a rotary body comprising: means for resiliently supporting said rotary body at at least two spaced points along the normal axis of rotation of said rotary body so that the at least two support points are resiliently restrained for motion in any direction in planes transverse to said axis; means to impart to said rotary body a rotational vibration within a minute angular range about the normal axis of rotation thereof, so that said rotary body is caused to generate a displacement of said normal axis of rotation due to the dynamic unbalance thereof; and means to detect the magnitude and direction of said displacement of said normal axis of rotation of said rotary body to thereby detect the amount and angular position of the dynamic unbalance of said rotary body which is a function of said displacement.

Claim 6

Apparatus for detecting the angular position and amount of a dynamic unbalance of a rotary body comprising: means for resiliently supporting said rotary body at at least two spaced points along the normal axis of rotation of said rotary body so that the at least two support points are resiliently restrained for motion in any direction in planes transverse to said axis; means to impart to said rotary body a rotational vibration within a minute angular range about the normal axis of rotation thereof, so that said rotary body is caused to generate a displacement of said normal axis of rotation due to the dynamic unbalance thereof; and means to detect the magnitude and direction of said displacement of said normal axis of rotation of said rotary body to thereby detect the amount and angular position of the dynamic unbalance of said rotary body which is a function of said displacement.

Claim 7

Apparatus for detecting the angular position and amount of a dynamic unbalance of a rotary body comprising: a base; two driving devices mounted on said base in opposing relation to each other, said driving devices carrying said rotary body at two spaced points along the normal axis of rotation of said rotary body and imparting rotational vibration to said rotary body; resilient support means for resiliently mounting each of said two driving devices to said base so that said driving devices and said rotary body are resiliently restrained for motion in any direction in planes transverse to said axis; and means to detect displacement of the resiliently supported driving devices caused by the rotational vibration of saiD rotary body to thereby detect the angular position of said rotary body which is a function of said displacements.

Claim 8

Apparatus for detecting the angular position and amount of a dynamic unbalance of a rotary body comprising: a base; two driving devices mounted on said base in opposing relation to each other, said driving devices carrying said rotary body at two spaced points along the normal axis of rotation of said rotary body and imparting rotational vibration to said rotary body; resilient support means for resiliently mounting each of said two driving devices to said base so that said driving devices and said rotary body are resiliently restrained for motion in any direction in planes transverse to said axis; and means to detect displacement of the resiliently supported driving devices caused by the rotational vibration of saiD rotary body to thereby detect the angular position of said rotary body which is a function of said displacements.

Claim 9

Apparatus according to claim 3 comprising chuck means on said driving devices for gripping said rotary body and mounting said rotary body to said driving means.

Claim 10

Apparatus according to claim 4 wherein each of said two driving devices comprises: a cylindrical housing closed at one end and opened at the other end; an electromagnet including a horse-shoe-shaped yoke received in said housing and a coil wound thereon, a separated part of said yoke being located at the open end of said housing; a driving shaft extending on the center axis of said housing and externally protruding out of said open end of said housing; resilient support means for fixing said driving shaft in position and for supporting said driving shaft such that said driving shaft is capable of being driven about its own axis by an external force and is returnable to its original position when said external force is removed, said resilient support means comprising a plurality of spring means, each spring means having one end fixed outside said housing of said each driving devices, each spring means extending substantially in the radial direction of said housing, and each spring means having the other end fixed to said base; and a magnetic-substance piece fixed to the protruding part of said driving shaft and extending in the radial direction of said housing, said magnetic-substance piece being deviated from said yoke by a minute angle around said center axis of said housing while said electromagnet is not energized, in order to prevent said separated part of said yoke from being short circuited; each of said chucks being fixed to the protruding end of said driving shaft of the corresponding one of said two driving devices; and said displacement detecting means comprising means for detecting the amount of change of each of said plurality of spring means and for operating on said amounts thereby detecting to determine the direction and magnitude of the displacement of said driving devices.

Claim 11

Apparatus as claimed in claim 5 wherein said displacement detecting means comprises a reference mark provided on the outer surface of said closed end of said housing of each of said driving devices and a scale plate fixed to said base opposed to said closed end, said scale plate comprising a plurality of concentrically circular scale lines for indicating the amount of displacement and radially directed straight linear scale lines for indicating the angle of the displacement, the deviation of said reference mark from the central position of said scale plate indicating the angular position and amount of the dynamic unbalance.

Claim 12

Apparatus as claimed in claim 6 wherein said scale plate is transparent.