DD284556A5 - column guide - Google Patents

Abstract

The invention relates to a Saeulenfuehrung, in particular for vertical adjustment movements. According to the invention, a prismatic base plate is arranged on a guide column. The base plate is guided by a trained as a movable positioning Traegerplatte guide side, the Traegerplatte mechanically adjustable, in pairs oppositely arranged, Druckluftaustrittsoeffnungen owning, arms. These arms are aimed at a tension band rule acting as a flatness standard. The supply of compressed air to the Druckluftaustrittsoeffnungen is connected to a compressed air components influencing compressed air control device. Due to the compressed air components acting in opposite directions on the tension band ruler in pairs, the thickness of the air cushion in the vertical axis can change, whereby the carrier plate is finely displaceable with high positional rigidity. Fig. 1 {Saaulenfuehrung; vertical adjustment movement; Compressed air storage; Pneumatic components control; Strap ruler; Clamping mechanisms; Actuator; Location stiffness}

Description

For this 1 page drawings

Field of application of the invention

The invention relates to a column guide, in particular for vertical adjustment movements. It can be used predominantly in the fine-mechanical-optical industry, with high demands on the positioning accuracy as well as on the positioner behavior.

Field of application of the invention Guides are generally known in which a component to be guided on a guide bush, which is a guide rod with

a small game comprises, is arranged. The guide bushing is slidably slid on a friction-reducing auxiliary material. Such guide assemblies are used in mechanical engineering as column guides on drills or enlargers. A major disadvantage, however, is that the applicability as a result of ever higher

Precision limits are set. If the main focus is on the precision in the transverse direction, it requires very precise guide rods, on the appropriate Holes in the sockets are tuned almost free of play. As a result, the adjuvant layer is very thin and when exposed

of lateral forces a metallic contact of the fitted parts is unavoidable.

Due to this fact, there is a stick-slip effect that makes close positioning almost impossible. That has

As a result, such guides for machine tools and similar devices in which relatively large forces in

Transverse direction occur, are hardly applicable. Furthermore, spring guides are generally known, which have the advantage of freedom from play and stick-slip-freedom, but only

are effective in the area of the smallest Steiiwege.

In Wälzkörperführungen, which are also well known, is an improvement of leadership and Positioning accuracy associated with arhöhtem manufacturing effort. Furthermore occurs in posltionierbewbryungen in Micron range due to deformation of the rolling elements on a pulse of leadership. In DD-WP 222080 a ball groove guide is described. There are two f.eihen between a base and a cover plate Arranged balls. The balls are guided in prismatic guide rails. One of the two outer ones Guide plates is arranged in the guide plane perpendicular to the guide direction movable and resilient. DE-OS 3326541 refers to a similar structural design. To reduce the friction factor is

between the saddle part and the guide bed, a pressure medium, wherein the pressure medium is introduced via channels.

However, the problem with this solution is the limited applicability when high lateral forces occur. In DD-WP 2111609 a linear taper bearing is shown for a round column guide, the individual elements of a Ball guide track in a cage are arranged in a plane. This plane forms another, through the central axis

and the guide element groove going plane, a defined angle.

Such guide arrangements also adhere to the disadvantages already mentioned. Limited applicability due to transverse forces also occurs with serostatic bearing devices such as

For example, described in DE-OS 3347282, recorded. These are relatively movable

Components that are made at least in the field of their bearing surfaces of fine crystalline granite and the storage area a Be subjected to the processing operation. Object of the invention The aim of the invention is to improve the positioning accuracy with less cost-effective production costs. Explanation of the Wosons of the invention

The invention has for its object to develop a column guide, especially for vertical adjustment movements, which minimizes the influence of shear forces on the positioning behavior with high bearing stiffness. According to the invention, this object is achieved by a column guide, consisting of a cylinder-mounted on a frame guide column on which a positioning on the guide surfaces between the fixed and movable member introduced compressed air channels compressed air stored Ist and adjusting units, achieved in that arranged on the guide column, a prismatic base plate and the base plate is enclosed on the guide side by a carrier plate embodied as a movable positioning element, the carrier plate is mechanically adjustable, arms having compressed air outlet openings arranged in pairs in opposite directions, which are directed onto a tension band ruler attached to the guide column and acting as a flatness standard, has the tensioning ruler with a clamping mechanism Position perpendicular to the guide column and the angle of attack of the clamping band Ruler changing actuator is connected and the supply de Compressed air is connected to the compressed air inlet openings with a control device influencing the compressed air components.

Preferably, the base and carrier plate made of finely crystalline material. Furthermore, it is advantageous if the compressed air components in the compressed air outlet openings influencing control device consists of a compressed air treatment unit, a pressure reducer and an auxiliary pressure generating pneumatic negator. Due to the pairs in opposite directions, acting on the clamping band ruler compressed air components, the thickness of the air cushion in the vertical axis can be changed, whereby the support plate is sensitively displaced at high positional stiffness. At each non-zero pressure difference of the pressure components, the support plate is reproducibly shifted from its position by a path, after which again sets a labile position in equilibrium.

For the axial displacement, a compressed air control device, consisting of the pressure reducer and pneumatic inverter is arranged. By an auxiliary pressure generated thereby, an inverted change in the compressed air components and thus a change in position is realized.

In the quasi-linear region of the change in position, the column guide makes it possible to carry out the distance measurement in an indirect way as a pressure measurement.

If at the same time a coordinated pressure component control, a deflection of the clamping band ruler, the result is a linear movement whose direction and speed is dependent on the angle of attack. This leads to a functional integration for drive, storage and guidance. The arrangement technical center! The column guide ensures a continuous Hilfsstoffilm and realize a stick-slip free positioning with high accuracy at very large lateral forces.

embodiment In an embodiment below, the column guide according to the invention is to be explained in more detail. Show this

Fig. 1: Column arrangement (front view) Fig. 2: Column arrangement (top view).

Figures 1 and 2 show the column guide according to the invention, consisting of a frame 1, on which a guide column

2 is mounted. At the guide column 2 is a prismatic base plate 3, the voln a support plate 4 is included on the guide side. The mutually facing surfaces of the base plate 3 and the support plate 4 are finished and formed as a result of introduced compressed air ducts 5 as an air bearing.

On the support plate 4 are compressed air outlet openings carrying arms 6, which are connected to a at the back of the guide column. 2

attached, acting as a flatness normal, clamping band ruler 7, are directed.

The clamping band ruler 7 is clamped by a clamping mechanism 8. For the functional safety of the drive and Storage of the guide is the clamping mechanism 8 and thus the angle of attack of the strap guide 7 by a Adjusting element 9 arranged variable in position. For pairwise opposing control of the located in the arms 6 compressed air components is located in the Supply lines for the compressed air, a compressed air preparation unit 10, a pressure reducer 11 and a pneumatic inverter 12,

which is supplied with an auxiliary pressure.

Due to the adjustable thickness of the air cushion between the compressed air outlet openings of the arms 6 and Spannbandlinaais 7, the support plate 4 sensitively displaceable, with high positional rigidity and accuracy fixing and

consequently position-correctable.

The pairwise opposing arrangement of the arms 6 and from the compressed air units 10,11 and 12 resulting

opposing pressure change, it comes to a non-zero pressure difference, which makes it to the defined

Displacement of the support plate 4 comes from the starting position. If a displacement of the clamping mechanism 8 takes place by the adjusting element 9, this results in a change of the Anstellwinkels of the tension band ruler 7. Thus, the conditions change in the air cushion, there is a split in

individual force components, of which one component can be used for the axial drive. Thus, a functional integration of drive, storage and correction or compensation mechanism can be realized.

Claims (3)

1. Column guide, in particular for vertical adjusting units, consisting of a cylindrical guide column fastened to a frame on which a positioning element is arranged in compressed air bearing via compressed air ducts introduced into the guide surfaces between stationary and movable element and adjusting units, characterized in that on the guide column (2) a prismatic base plate (3) is enclosed on the guide side by a carrier plate (3) designed as a movable positioner element, the carrier plate (3) has mechanically adjustable pairs arranged in opposite directions, compressed air outlets, arm (6) which rest on a guide post (2). attached, acting as a flatness normal clamping band ruler (7) are directed, the clamping band ruler (7) via a clamping mechanism (8) can be tensioned, the clamping mechanism (8) with its position perpendicular to the guide column (2) and the angle of the Spannb andlineals (7) is connected to a changing adjusting element (9) and the supply of compressed air to the compressed air outlet openings communicates with a control device influencing the compressed air components. 2. Column guide, according to claim 1, characterized in that the carrier plate (3) and the base plate (2) preferably consist of finely crystalline materials. 3. Column guide, according to claim 1, characterized in that the compressed air components in the compressed air outlet openings of the arms (6) influencing control device consists of a compressed air treatment unit (10), a pressure reducer (11) and one, an auxiliary pressure generating pneumatic inverter (12).