A device creates a clamping between clamping surfaces (24, 26) facing each other and forming a frictional engagement between each other, on a stationary body (2) and a body (4) that can be moved relative the stationary body (2), in particular in the form of a rotary indexing table. A power drive (40) that can be actuated by a fluid pressure is provided for creating a clamping force effective between the clamping surfaces (24, 26). For forming pairs of clamping surfaces (24, 26) interacting with each other a pack of lamellas lying upon each other is provided, formed from stationary disks (24) connected to the stationary body (2) and from movable disks (26) connected to the movable body (4). The power drive (40) can be used to apply a pressing force to the disks (24, 26) in a clamping area (42).

A device for clamping a rotatably mounted shaft element including: a housing element having an annular housing portion wherein the shaft extends in the axial direction; an elastically deformable annular clamping ring element arranged in the annular housing portion, wherein the clamping ring has a cross-sectional profile with a first profile portion, extending radially inward and protrudes radially through an annular circumferential opening; and a pressure chamber formed in the annular housing has at least one pressure chamber portion arranged radially on the inner side adjacently to at least one second profile portion of the clamping ring; wherein the rotatably mounted shaft in a rest state clamped by frictional engagement with the first profile of the clamping ring protruding toward the shaft, and wherein the frictional engagement between the shaft and the first profile is releasable, the clamping ring is elastically deformable radially outward by pneumatic or hydraulic pressure chamber.

A device for clamping a rotatably mounted shaft element including: a housing element having an annular housing portion wherein the shaft extends in the axial direction; an elastically deformable annular clamping ring element arranged in the annular housing portion, wherein the clamping ring has a cross-sectional profile with a first profile portion, extending radially inward and protrudes radially through an annular circumferential opening; and a pressure chamber formed in the annular housing has at least one pressure chamber portion arranged radially on the inner side adjacently to at least one second profile portion of the clamping ring; wherein the rotatably mounted shaft in a rest state clamped by frictional engagement with the first profile of the clamping ring protruding toward the shaft, and wherein the frictional engagement between the shaft and the first profile is releasable, the clamping ring is elastically deformable radially outward by pneumatic or hydraulic pressure chamber.

A rotation indexing device includes a rotary body having a main shaft rotatably supported via a bearing in an accommodating hole of a frame and a table part provided on one end-side of the main shaft, a workpiece or a jig for attaching the workpiece being attached to the table part; an oil seal provided in a void portion, which is a portion on the one end-side relative to the bearing, in a space between the frame and the rotary body; a drive mechanism configured to rotationally drive the rotary body; and a holding mechanism for holding the rotary body at an indexed angular position during indexing processing. A dust seal is provided in the void portion on an opposite side to the bearing-side with respect to the oil seal.

A rotation indexing device includes a rotary body having a main shaft rotatably supported via a bearing in an accommodating hole of a frame and a table part provided on one end-side of the main shaft, a workpiece or a jig for attaching the workpiece being attached to the table part; an oil seal provided in a void portion, which is a portion on the one end-side relative to the bearing, in a space between the frame and the rotary body; a drive mechanism configured to rotationally drive the rotary body; and a holding mechanism for holding the rotary body at an indexed angular position during indexing processing. A dust seal is provided in the void portion on an opposite side to the bearing-side with respect to the oil seal.

A table assembly for a machine tool is provided. The table assembly has a slide, a rotatable table and a table rotation mechanism placed on board the slide and adapted to be driven to rotate the table about a vertical axis. The table rotation mechanism has at least one rotation assembly engaged with a ring gear of the table. The at least one rotation assembly has a torque motor having a vertical motor axis and a reduction gear having an inlet engaged with the torque motor, and an outlet pinion engaged with the ring gear of the table, coaxial to the motor axis. The machine tool is a milling machine or a gantry boring machine.

A table assembly for a machine tool is provided. The table assembly has a slide, a rotatable table and a table rotation mechanism placed on board the slide and adapted to be driven to rotate the table about a vertical axis. The table rotation mechanism has at least one rotation assembly engaged with a ring gear of the table. The at least one rotation assembly has a torque motor having a vertical motor axis and a reduction gear having an inlet engaged with the torque motor, and an outlet pinion engaged with the ring gear of the table, coaxial to the motor axis. The machine tool is a milling machine or a gantry boring machine.

The present disclosure provides a turret tool cooling apparatus including a tool stand body, a turret installed on the tool stand body and configured to accommodate a plurality of tools, an indexing unit configured to index the plurality of tools accommodated in the turret, a driving unit installed in the tool stand body and configured to provide rotational power to the indexing unit, and a cooling flow path configured to deliver a cryogenic cooling fluid, which is supplied from a cryogenic cooling fluid storage unit, to one or more tools accommodated in the turret, in which the cooling flow path is disposed to penetrate a part of the indexing unit, such that a cryogenic cooling fluid is consistently supplied even when the turret performs the indexing.

The present disclosure provides a turret tool cooling apparatus including a tool stand body, a turret installed on the tool stand body and configured to accommodate a plurality of tools, an indexing unit configured to index the plurality of tools accommodated in the turret, a driving unit installed in the tool stand body and configured to provide rotational power to the indexing unit, and a cooling flow path configured to deliver a cryogenic cooling fluid, which is supplied from a cryogenic cooling fluid storage unit, to one or more tools accommodated in the turret, in which the cooling flow path is disposed to penetrate a part of the indexing unit, such that a cryogenic cooling fluid is consistently supplied even when the turret performs the indexing.

A rotary table according to the exemplary embodiment of the present disclosure includes a piston 70 having a first tapered portion 72, and a clamp 80 having a second tapered portion 82. When the first tapered portion 72 comes into close contact with the second tapered portion 82 by a movement of the piston 70, a pallet base 30 is fixed to a table base 10, and thus the pallet base 30 is rotated, thereby maintaining a preset posture.