The leaf (1) of the door is hung from a vertical supporting plate (2) which slides in a guide (3) having a stationary housing (4) with a slot (5) in its underside. Sliding pieces (7) on the plate (2) move between rails (6) on either side of the slot (5), without contact. Permanently magnetised bars (8a-8d) are ranged around part of the circumference of a tubular passage in which a cylindrical moulding (12) on top of the plate (2) carries co-operative magnets (11a-11d) corresponding spaced. The door may be driven by an electric linear motor (15). ADVANTAGE - Simple structure. Generates very little noise with effective damping of all movements by eddy-current braking.

Contactless magnetic guidance system esp. for sliding door - exploits mutual repulsion of like poles of radial permanent magnets at edges of mouldings and guide

A tester for backlash-free rolling of gears with a mating gear generally comprises a base, a stationary spindle on which a test gear can be mounted and which can be driven by a motor; an oscillating slide on which a rotary mounting device is located with an axis of rotation for loosely rotating the mating gear and which slide being guided for easy movement in the direction of the center distance of the two gears; first means for setting a specified test center distance between the two gears; second means providing a specifiable test force for a constant tight mesh of the two gears; and third means for measuring center distance variations during the rotation of two gears. To simplify and reduce design costs of such testers, the stationary part of a linear motor is disposed on the base and the moveable part thereof is disposed to the oscillating slide, and an associated separate CNC control is provided to allow the linear motor to be used for said three means.

Double flank rolling tester

Some embodiments relate to a compact noncontact mechanical coupling, damping, and/or load bearing device comprising an internal load bearing member and an external load bearing member mated in an interdigitated relation while maintaining a gap therebetween. Some embodiments include a means for maintaining the gap between the internal and external load bearing members including, without limitation, hydrostatic means, hydrodynamic means, electrorheological fluids, magnetorheological fluids, electric fields, and/or magnetic fields.

Compact non-contact mechanical coupling, damping and/or load bearing device

A method of assembling an air bearing, the air bearing having a guide on a fixed side, and a slider having a pair of opposing members arranged on opposite sides of the guide, the slider being float-supported so as to be able to move relative to the guide, the method having: contacting a first opposing member of the pair of opposing members to the guide; supplying compressed air of a predetermined pressure between the first opposing member and the guide contacting each other, so as to form a temporary gap twice as large as a target bearing gap between the first opposing member and the guide; maintaining contact between the guide and a second opposing member of the pair of opposing members; and supplying compressed air of a predetermined pressure between the first opposing member and the guide as well as the second opposing member and the guide, so as to form respective target bearing gaps between first and second opposing members and the guide, in place of the temporary gap.

Method of assembling air bearing, air bearing and linear drive unit equipped with the same

A linear guide comprises a support element and a carriage sliding on the support element. The carriage has two hollow cylinders sliding on an air bearing on the support element and a body arranged between them. The support element and the two hollow cylinders of the carriage are separated by a gap to which compressed air can be applied. A linear motor formed from a u-shaped stator and an armature is foreseen as drive mechanism for the carriage. During operation, heat dissipation occurs in the armature which heats the carriage. In order to maintain changes in the thickness of the gap within predetermined limits, the support element and/or those parts of the carriage whose temperature influence the thickness of the gap are heated to a predetermined temperature.

Linear guide with an air bearing having provision for heating a support element of the linear guide to maintain fluid gap

In a linear guide for precision machines, the linear bearing of the mobile bearing element (2) which moves relative to the stationary bearing element (1) is achieved by means of magnetic bearings (3, 5) or air bearings (9, 11). The drive is provided by electric motors, in particular linear motors (6, 7). To ensure optimal stability to temperature fluctuations and hence optimal precision, for example in measuring machines, all heat-generating electrical devices, i.e. the coils (8) of the magnets (3) or motors (6) are manufactured by superconducting technology.

Linearfuehrung fuer praezisionsmaschinen

not available for EP0387312Abstract of corresponding document: DE3823978In a linear guide for precision machines, the linear bearing of the mobile bearing element (2) which moves relative to the stationary bearing element (1) is achieved by means of magnetic bearings (3, 5) or air bearings (9, 11). The drive is provided by electric motors, in particular linear motors (6, 7). To ensure optimal stability to temperature fluctuations and hence optimal precision, for example in measuring machines, all heat-generating electrical devices, i.e. the coils (8) of the magnets (3) or motors (6) are manufactured by superconducting technology.

Jacob Etienne Ing

Papers

Linearfuehrung fuer praezisionsmaschinen

Linear guide for precision machines.