A tilt device includes: a drive motor that provides a drive force for swinging a tilt member; an auxiliary cylinder coupled to the tilt member to assist swing of the tilt member by the drive motor; and a control device that performs drive control of the drive motor and the auxiliary cylinder. In the movable range of the tilt member, a moment about the swing axis generated in the tilt member by the gravitational force is always directed to only one side in the rotational direction, and an assistive moment about the swing axis provided to the tilt member by a cylinder pressure is always directed to only the other side in the rotational direction. The control device fluctuates the cylinder pressure such that the assistive moment is less than the moment generated in the tilt member by the gravitational force.

The invention relates to a device for the angular positioning of a shaft, having a computerized command motion controller, two motors with servo drivers and a mechanism with screws and nuts and one crank arm functioning together to lock the positioning output shaft into a fixed position or to rotate it into any direction with zero backlash with variable speed and/or torque.

The invention relates to a device for the angular positioning of a shaft, having a computerized command motion controller, two motors with servo drivers and a mechanism with screws and nuts and one crank arm functioning together to lock the positioning output shaft into a fixed position or to rotate it into any direction with zero backlash with variable speed and/or torque.

A drilling-milling device comprising a housing; a drive shaft; a spindle; and a brake. The drive shaft and the spindle being coupled to one another by a gear mechanism, and the brake being coupled to the spindle and a braking torque of the brake being transmitted to the housing.

A drilling-milling device comprising a housing; a drive shaft; a spindle; and a brake. The drive shaft and the spindle being coupled to one another by a gear mechanism, and the brake being coupled to the spindle and a braking torque of the brake being transmitted to the housing.

A rotary table (1) includes a base body (10), a worm wheel (21), an inner ring (22), a plurality of rolling elements, and a worm screw unit (30). The worm screw unit (30) includes a worm screw (31) held to be rotatable around an axis and having a second gear (31A) meshing with the first gear (215), and a worm screw housing (32) surrounding and holding the worm screw (31) and being fixed to contact the holding surface at a planar contacting surface thereof. One of the holding and contacting surfaces has a cylindrical pin (33) arranged to protrude therefrom. The other of the holding and contacting surfaces has a first recess (11) formed to receive the pin (33), the first recess having a width corresponding to the pin (33) and being elongated in the radial direction of the worm wheel (21).

The present invention provides an indexing driving device for a turntable, which is provided with a plurality of roller followers arranged at equal angular intervals; and a barrel component, which is provided on one side of the turntable, the cam component is provided with a first side rib wall with a continuous cam curved surface in a first direction and a second side rib wall with a continuous cam curved surface in a second direction, and the first side rib wall and the second side rib wall are facing opposite sides to form a cam groove with variable groove width, for introducing the roller followers and rotating the turntable; wherein the cam groove with variable groove width makes the first side rib wall and the second side rib wall respectively pre-compress to at least one pair of the roller followers of the turntable symmetrically in different directions, so as to effectively eliminate the backlash problem between the cam component and the roller followers and improve the positioning accuracy of the turntable.

The feed axis device of a machine tool is equipped with first and second planetary gear speed reducers, each of which is obtained from an inner element, outer element, and intermediate elements that are disposed between the two, the elements being disposed so as to be mutually rotatable and combined in series so that one of the three elements is a fixed section, one of the two remaining elements is the input section and the other is the output section. The element that is the input section of the first speed reducer and the element that is the input section of the second speed reducer are connected to a single drive source. The element that is the output section of the first speed reducer and the element that is the output section of the second speed reducer are connected. The feed axis device is provided with an actuator.

The feed axis device of a machine tool is equipped with first and second planetary gear speed reducers, each of which is obtained from an inner element, outer element, and intermediate elements that are disposed between the two, the elements being disposed so as to be mutually rotatable and combined in series so that one of the three elements is a fixed section, one of the two remaining elements is the input section and the other is the output section. The element that is the input section of the first speed reducer and the element that is the input section of the second speed reducer are connected to a single drive source. The element that is the output section of the first speed reducer and the element that is the output section of the second speed reducer are connected. The feed axis device is provided with an actuator.

According to an embodiment of the present invention, a torque variation of a servomotor, which is measured in a numerical control apparatus of an existing numerical control machine tool, is observed, and a backlash is detected by calculating a transfer distance of an output shaft of the servomotor at a torque peak, without adding additional positioning detection equipment, thereby detecting an accurate backlash amount without adding additional equipment.