A bearing cover (10) has a bearing receiving space (18) for a bearing (9) and has a fastening region (17) for fastening the bearing cover (10) to a housing body (7). The bearing receiving space (18) of the bearing cover (10) is decoupled electrically from the fastening region (17) of the bearing cover (10) to prevent an undesired flow of electric current across the bearing (9).

An air suspension support and motion guiding device having unequal-depth throttling chambers. Throttling plugs (10) are arranged regularly on an air suspension working surface, forming an array of throttling chambers with unequal depths. The invention improves the rotational stiffness per unit area for an air suspension working surface while ensuring support and stability of an air-suspended rail (1) and enables construction of a small-volume, long cantilever, high torque load two-dimensional motion reference device.

A cantilever linear motion reference device employing two-layer air suspension. By means of a two-layer force sealed air suspension structure, the invention realizes two-dimensional air suspension support and motion guiding and improves the rotational stiffness per unit for an air suspension working surface. By combining accurate driving and feedback control, the invention achieves high speed, high acceleration, high frequency motion, and enables construction of a small-volume, long cantilever, high torque load two-dimensional motion reference device.

Provided is a gas discharge roil, which includes: an inner roll, which has a rotary shaft; an outer roll, which is fitted and integrated with an outer peripheral surface of the inner roll; gas introduction grooves, which are formed on the outer peripheral surface of the inner roll over an entire circumference thereof at substantially uniform intervals along a circumferential direction of the inner roll so as to extend along a rotary shaft direction of the inner roll, and which are configured to define gas introduction channels between an inner peripheral surface of the outer roll and the gas introduction grooves; and a group of gas discharge holes formed on the outer roll so as to penetrate through to the gas introduction channels. A circumferential cutoff rate of a gas introduction channel cross-section is 36% or less, or a porosity within a gas introduction range is 20% or less.

A substrate positioning device for radially positioning a substrate including a first mounting frame, and a plurality of centering devices coupled to the first mounting frame and spaced apart from one another. Each of the plurality of centering devices including a mount, a flexure element coupled to the mount and having a radial edge, and an adjustment member coupled to the mount. The adjustment member is adjusting between a retracted state and an extended state for pivoting the flexure element between a first position and a second position with respect to the mount. Each centering device is separately actuatable to move the flexure element of a respective centering device with respect to an edge of the substrate thereby radially positioning the substrate with respect to the first mounting frame.

A substrate holder for use with an interferometer comprises a first and second support each comprising a bearing land and a bearing base arranged to form a bearing pocket and a gas inlet fluidly coupled to the bearing pocket. The first support and the second support are positioned relative to one another such that the first bearing pocket is opposed to the second bearing pocket thereby forming a measurement cavity between the first support and the second support. At least one of the first support and the second support comprises reference optics through which one or more interferometric or optical measurements can be taken. Gas supplied to the first bearing pocket and gas supplied to the second bearing pocket form an air bearing in the measurement cavity for supporting a substrate in the measurement cavity without contact between the substrate, the first support, and the second support.

A rotary table apparatus includes: a table part having a placement surface; a support part having a guide surface facing an opposing surface which is on an opposite side of the placement surface of the table part; an air film forming part that forms an air film by supplying compressed air between the guide surface and the opposing surface; a negative pressure generating part that sucks air between the guide surface and the opposing surface; a discharge part formed with a discharge port; and an opening adjusting part that adjust the size of an opening area of the discharge port in accordance with the size of a compressed air pressure corresponding to a load applied to the table part.

The present invention relates to a rotary assembly (1), in particular for a rheological measurement apparatus, comprising: a stator (3), a rotor (2) that can rotate with respect to the stator (3), the rotor (2) being axially retained by an axial retaining means (4) preventing the movement of the rotor (2) along the axis of rotation (A) thereof, the axial retaining means (4) comprising a flexible rod suitable for being attached to a frame (5) and which allows a radial movement of the rotor (2), a magnetic bearing comprising a rotor element (6) made of magnetic material mounted on the rotor (2) and a stator element (7) made of magnetic material mounted on the stator (3), at least one of the rotor and stator elements made of magnetic material being a spherical magnet,
wherein the rotary assembly (1) has a stable position in which the rotor (2) is aligned with the axis of rotation (A) thereof, and the elements made of magnetic material are facing each other along the axis of rotation (A) of the rotor and are separated from each other by a given distance (M), and wherein the elements made of magnetic material are configured to attract each other, so as to generate a return force which opposes the axial misalignment of said rotor (2).

The invention also relates to a rheological measurement apparatus comprising at least one such rotary assembly (1).

In some examples, a hinge assembly includes a hinge cover, a hinge inside the hinge cover to pivotally attach a base housing to a display housing of a computer, a space inside the hinge cover and adjacent a first side of the hinge, and a cable retainer positioned in the space, the cable retainer comprising receptacles to receive respective portions of a cable, the receptacles to retain the cable in position as the base housing and the display housing are pivoted with respect to one another with the hinge.

The present disclosure relates to a swing bearing and a wearable device. The swing bearing includes an inner ring, an outer ring, and a plurality of rolling elements, a plurality of first grooves arranged at intervals along a circumferential direction being formed on an outer circumferential surface of the inner ring, a plurality of second grooves arranged at intervals along a circumferential direction being formed on an inner circumferential surface of the outer ring, each rolling element being disposed between the corresponding first groove and the second groove, and the rolling element, the first groove, and the second groove being configured to restrict relative rotational movement between the inner ring and the outer ring and allow the inner ring and the outer ring to produce shaft axis deflection movement.