Rotatable shutter means having light-blocking portion when stationary

Claim 2

Means for monitoring the rotation of a rotatable member comprising a light source, a light pickup spaced from the light source and arranged to receive light therefrom, and means for interfering with the passage of light to the light pickup comprising: shutter means including a pair of shutters freely pivotally mounted on the axis of rotation of said rotatable member, each shutter of said pair moving during nonrotation of said rotatable member to a position determined by gravity, at least one of said positions being between said light source and said light pickup; and positive drive means fixed on the rotatable member for effecting during rotation of the shutter means at a fixed angular position relative to the rotatable member independent of the velocity of rotation; each shutter having a portion which during rotation traverses a path between the light source and the light pickup and which when the rotatable member is stationary remains between the light source and the light pickup regardless of the rest position of the rotatable member; and whereby the shutter means intermittently interferes with the passage of light to the light pickup during rotation of the rotatable member and uninterruptedly interferes with such passage of light when the rotatable member is stationary.

Claim 3

Means for monitoring the rotation of a rotatable member comprising a light source, a light pickup spaced from the light source and arranged to receive light therefrom, and means for interfering with the passage of light to the light pickup comprising: shutter means including a pair of shutters freely pivotally mounted on the axis of rotation of said rotatable member, each shutter of said pair moving during nonrotation of said rotatable member to a position determined by gravity, at least one of said positions being between said light source and said light pickup; and positive drive means fixed on the rotatable member for effecting during rotation of the member positive rotation of the shutter means at a fixed angular position relative to the rotatable member independent of the velocity of rotation; each shutter having a translucent colored filter portion which during rotation traverses a path between the light source and the light pickup and which when the rotatable member is stationary remains beTween the light source and the light pickup regardless of the rest position of the rotatable member; and whereby the shutter means intermittently filters the light passing to the light pickup during rotation of the rotatable member and uninterruptedly filters the light when the rotatable member is stationary.

Claim 4

Means for monitoring the rotation of a rotatable member comprising a light source, a light pickup spaced from the light source and arranged to receive light therefrom, and means for interfering with the passage of light to the light pickup comprising: shutter means including a pair of shutters freely pivotally mounted on the axis of rotation of said rotatable member, each shutter of said pair moving during nonrotation of said rotatable member to a position determined by gravity, at least one of said positions being between said light source and said light pickup; and positive drive means fixed on the rotatable member for effecting during rotation of the member positive rotation of the shutter means at a fixed angular position relative to the rotatable member independent of the velocity of rotation; each shutter having a translucent colored filter portion which during rotation traverses a path between the light source and the light pickup and which when the rotatable member is stationary remains beTween the light source and the light pickup regardless of the rest position of the rotatable member; and whereby the shutter means intermittently filters the light passing to the light pickup during rotation of the rotatable member and uninterruptedly filters the light when the rotatable member is stationary.

Claim 5

Means for monitoring the rotation of a rotatable member comprising a light source, a conductor having one end spaced from the light source and arranged to receive light therefrom, the other end of the light conductor being secured at a display panel, and means for interfering with the passage of light to the light conductor comprising: shutter means including a pair of shutters freely pivotally mounted on the axis of rotation of said rotatable member, each shutter of said pair moving during nonrotation of said rotatable member to a position determined by gravity, at least one of said positions being between said light source and said light pickup, and positive drive means fixed on the rotatable member for effecting during rotation of the member positive rotation of the shutter means at a fixed angular position relative to the rotatable member independent of the velocity of rotation; each shutter having a colored filter portion which during rotation traverses a path between the light source and the light conductor and which when the rotatable member is stationary remains between the light source and the light conductor regardless of the rest position of the rotatable member; and whereby the colored filter portion intermittently filters the light passing to the light conductor during rotation of the rotatable member and uninterruptedly filters the light when the rotatable member is stationary.

Claim 6

Means for monitoring the rotation of a rotatable member comprising a light source, a conductor having one end spaced from the light source and arranged to receive light therefrom, the other end of the light conductor being secured at a display panel, and means for interfering with the passage of light to the light conductor comprising: shutter means including a pair of shutters freely pivotally mounted on the axis of rotation of said rotatable member, each shutter of said pair moving during nonrotation of said rotatable member to a position determined by gravity, at least one of said positions being between said light source and said light pickup, and positive drive means fixed on the rotatable member for effecting during rotation of the member positive rotation of the shutter means at a fixed angular position relative to the rotatable member independent of the velocity of rotation; each shutter having a colored filter portion which during rotation traverses a path between the light source and the light conductor and which when the rotatable member is stationary remains between the light source and the light conductor regardless of the rest position of the rotatable member; and whereby the colored filter portion intermittently filters the light passing to the light conductor during rotation of the rotatable member and uninterruptedly filters the light when the rotatable member is stationary.

Claim 7

Means for monitoring the rotation of a rotatable shaft comprising: a light source mounted below the rotatable shaft; a fiber optic light conductor having one end mounted below the shaft and spaced from the light source and arranged to receive light therefrom, the other end of the light conductor being secured at a display station remote from the shaft; and means for interfering with the passage of light to the light conductor including a pair of shutters freely pivotally mounted on the shaft at the axis of rotation thereof and means for driving the shutter to rotate with the shaft during shaft rotation, the shutters each having a portion which during rotation traverses a path between the light source and the light conductor; the means for driving the shutters including a pair of pins secured to the shaft at opposite sides of the axis of rotation and extending between the shutter, so that during shaft rotation the shutters intermittently pass between the light source and the light conductor and when the shaft is stationary in any angular position at least one shutter remains between the light source and the light conductor; and whereby the condition of illumination of the light conductor at the display station is dependent on the condition of shaft rotation.

Claim 8

Means for monitoring the rotation of a rotatable shaft comprising: a light source mounted below the rotatable shaft; a fiber optic light conductor having one end mounted below the shaft and spaced from the light source and arranged to receive light therefrom, the other end of the light conductor being secured at a display station remote from the shaft; and means for interfering with the passage of light to the light conductor including a pair of shutters freely pivotally mounted on the shaft at the axis of rotation thereof and means for driving the shutter to rotate with the shaft during shaft rotation, the shutters each having a portion which during rotation traverses a path between the light source and the light conductor; the means for driving the shutters including a pair of pins secured to the shaft at opposite sides of the axis of rotation and extending between the shutter, so that during shaft rotation the shutters intermittently pass between the light source and the light conductor and when the shaft is stationary in any angular position at least one shutter remains between the light source and the light conductor; and whereby the condition of illumination of the light conductor at the display station is dependent on the condition of shaft rotation.

Claim 9

Means for monitoring the rotation of a rotatable shaft comprising: a light source mounted below the rotatable shaft; a fiber optic light conductor having one end mounted below the shaft and spaced from the light source and arranged to receive light therefrom, the other end of the light conductor being secured at a display station remote from the shaft; means for filtering the light passing to the light conductor including a pair of shutters freely pivotally mounted on the shaft at the axis of rotation thereof and means for driving the shutters to rotate with the shaft during shaft rotation, the shutters each having a colored translucent filter portion which during rotation traverses a path between the light source and the light conductor; the means for driving the shutters including a pair of pins secured to the shaft at diametrically opposite sides of the axis of rotation and extending between the shutters, so that during shaft rotation the fIlter portions intermittently pass between the light source and the light conductor and when the shaft is stationary in any angular position at least one filter portion remains between the light source and the light conductor; and whereby only light colored by a filter portion is received at the display station when the shaft is stationary.

Claim 10

Means for monitoring the rotation of a rotatable shaft comprising: a light source mounted below the rotatable shaft; a fiber optic light conductor having one end mounted below the shaft and spaced from the light source and arranged to receive light therefrom, the other end of the light conductor being secured at a display station remote from the shaft; means for filtering the light passing to the light conductor including a pair of shutters freely pivotally mounted on the shaft at the axis of rotation thereof and means for driving the shutters to rotate with the shaft during shaft rotation, the shutters each having a colored translucent filter portion which during rotation traverses a path between the light source and the light conductor; the means for driving the shutters including a pair of pins secured to the shaft at diametrically opposite sides of the axis of rotation and extending between the shutters, so that during shaft rotation the fIlter portions intermittently pass between the light source and the light conductor and when the shaft is stationary in any angular position at least one filter portion remains between the light source and the light conductor; and whereby only light colored by a filter portion is received at the display station when the shaft is stationary.