Rotational positioning device
AssigneeSankyo Seisakusho Co.
InventorNaoyuki Takahashi
Life of this patent
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Abstract
Provided is a rotational positioning device capable of positioning a rotational angle at a target angle position with high precision. A rotational positioning device is provided with: a housing; a rotational member which is rotatable about a rotational member axial line and at least a part of which is accommodated in the housing; and at least one sensor installed in the housing. A graduated scale with a plurality of scale marks is formed integrally with the rotational member along the circumferential direction of the rotational member. The at least one sensor detects an angle change amount due to rotation of the rotational member on the basis of the plurality of scale marks. The rotational member is positioned at the target angle position on the basis of the angle change amount.
Claims8
A rotational positioning device, comprising:
- a housing;
- a rotational member rotatable about a rotational member axial line, wherein a transmission mechanism is installed along a circumferential direction of the rotational member, at least a part of the rotational member being accommodated in the housing;
- a second rotational member rotatable about a second rotational member axial line;
- a sensor flange installed in the housing, wherein a circular rotational member hole is provided in the sensor flange;
- and
- at least one sensor installed in the sensor flange,
- wherein due to a contact between the transmission mechanism of the rotational member and the second rotational member, a rotation of one of the rotational member and the second rotational member enables a rotation of the other of the rotational member and the second rotational member;
- wherein a graduated scale having a plurality of scale marks is integrally formed with the rotational member along the circumferential direction of the rotational member, the at least one sensor detects an angle change amount due to the rotation of the rotational member based on the plurality of scale marks, and the rotational member is positioned at a target angle position based on the angle change amount;
- wherein at least a part of the rotational member is accommodated in the rotational member hole, whereby a central axis line of the rotational member hole is aligned with the rotational member axial line such that a position of the at least one sensor to the graduated scale is determined;
- and
- wherein a first seal is provided within the rotational member hole between the sensor flange and the rotational member to isolate the at least one sensor from the transmission mechanism so as to prevent a lubricant from entering a space where the at least one sensor is installed.
Dependencies are inferred from the claim text.