GB2035564A - Linear positioning device - Google Patents
Linear positioning device Download PDFInfo
- Publication number
- GB2035564A GB2035564A GB7845528A GB7845528A GB2035564A GB 2035564 A GB2035564 A GB 2035564A GB 7845528 A GB7845528 A GB 7845528A GB 7845528 A GB7845528 A GB 7845528A GB 2035564 A GB2035564 A GB 2035564A
- Authority
- GB
- United Kingdom
- Prior art keywords
- base plate
- object carrier
- support
- spring
- leaf
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000005259 measurement Methods 0.000 claims description 6
- 230000003287 optical effect Effects 0.000 claims description 5
- 230000033001 locomotion Effects 0.000 abstract description 7
- 238000005096 rolling process Methods 0.000 description 7
- 238000011109 contamination Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000005299 abrasion Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000005461 lubrication Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 1
- 208000023414 familial retinal arterial macroaneurysm Diseases 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q1/00—Members which are comprised in the general build-up of a form of machine, particularly relatively large fixed members
- B23Q1/25—Movable or adjustable work or tool supports
- B23Q1/26—Movable or adjustable work or tool supports characterised by constructional features relating to the co-operation of relatively movable members; Means for preventing relative movement of such members
- B23Q1/34—Relative movement obtained by use of deformable elements, e.g. piezoelectric, magnetostrictive, elastic or thermally-dilatable elements
- B23Q1/36—Springs
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q17/00—Arrangements for observing, indicating or measuring on machine tools
- B23Q17/22—Arrangements for observing, indicating or measuring on machine tools for indicating or measuring existing or desired position of tool or work
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
- G01B5/0002—Arrangements for supporting, fixing or guiding the measuring instrument or the object to be measured
- G01B5/0004—Supports
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Details Of Measuring And Other Instruments (AREA)
Abstract
The device comprises a movable object carrier (25) suspended by parallel leaf springs (26) for linear translatory motion from a motion compensating member (23) which is likewise suspended by leaf springs (22) from a fixed support (21), said carrier being connected to said fixed support through biasing means (34) and being displaced through the agency of a lever (28) which is coupled to said carrier via connecting means (30) and is pivoted from said fixed support by means of a transverse-spring-loaded hinge (27). The lever (28) in turn is adjusted by means of a micrometer screw (29). <IMAGE>
Description
SPECIFICATION
A linear positioning device, preferably for optical measurements
The invention relates to a linear positioning device, preferably for optical measurements.
The structure of the known linear positioning devices can be characterized in that they are provided with an object carrier, fitted into a guide being furnished with frictional or rolling elements arranged on the base plate and formed with different profiles. The object carrier is put into motion by means of a directly connected operating micrometerscrew. The positioning devices thus constructed can be characterized by the jerky slide, by the abrasion due to friction, the contaminations of the lubricants on the frictional surfaces and by the operating micrometer-screw, being directly connected to the object carrier.
The structural characteristics described above are setting a rather strict upper limit to the accuracy of messuring and reproducible positioning, whereas the production of the devices requires a highly accurate surfacial fine-processing and a heat-treated material involving high expenses.
The drawbacks of the known positioning devices are, as follows: 1/ due to the jerky slide, abrasion and contamination characterizing the sliding or rolling guides, the accuracy of measurement is low; 2/ realizable accuracy of measuring is determined by the basic pitch of the operating micrometer-screw being in a direct connection with the object carrier; 3/ surfaces requiring lubrication cannot be used in vacuum and at extreme temperatures; 4/ production of the devices requires a highly accurate surfacial processing and a heattreated material involving considerable expenses.
The aim of the invention has been to develop a linear positioning device at which the object carrier can be guided without friction and clearance, respectively. The micrometerscrew is directly connected to the object carrier by a transmission of high ratio, suspended freely of friction and clearance; as a consequence, compared to known solutions, the resulting messuring and reproducing accuracy will be higher by one order of magnitude, simultaneously accurate surfacial processing and heat-treated materials can be omitted, resulting in an economical production.
The invention relates to a linear positioning device, preferably for optical measurements.
The essence of the invention lies in that between the base plate and the support of the object carrier a compensating member, while between the object carrier and the micrometer-screw an actusting lever has been arranged. The compensating member is connected by means of a leaf spring both to the base plate and the support of the object carrier, while the actusting lever-againet which the micrometer-screw is bearing upon-is connected by means of a transverse spring actuated joint to the base plate and by an elastic joint to the support of the object carrier.
At a preferable embodiment of the invention on the base plate of the device there are perpendicularly protruding extensions. Between the base plate and the object carrier there is a compensating member arranged, whereas between the support of the object carrier, the object carrier and the operating micrometer-screw there is an actusting lever inserted. The compensating memeber is connected by means of leaf springs both to the extensions of the base plate and the support of the object carrier, while said support is connected by means of a spiral spring to the extension of the base plate.The actuating lever of the device is connected by means of a transversc spring-actuated joint to the extension of the base plate and by means of leafspring to the support of the object carrier, at last the operating micrometer-screw-led through one of the extensions of the base plate-is bearing up againet the actusting lever.
At a further preferable embodiment of the invention the device is provided with a second frams-shaped actuating lever, whereby the first actuating lever-againet which the micrometer-screw is bearing upon-is surrounding the compensating member, and the support of the object carrier, while the second actuating lever encloses the support of said object carrier, simultaneously being connected by means of a transverse-spring actuated joint to one of the extensions of the base plate, by means of a leaf-spring-actuated push rod to the first actuating lever and by means of a leaf-spring to the support of the object carrier.
The linear positioning devices already known and according to the invention, respectively, will be described in details by means of the drawings enclosed, where
Figure 1 and 1/a are illustrating a known positioning device provided with prismatic sliding guides and the cross-section thereof,
Figure 2 and 2/a are showing a known positioning device provided with a rolling ballguide,
Figure 3 is showing an embodiment of the linear positioning device according to the invention,
Figure 4 the section of the first singlearmed lever and
Figure 5the section of the second singlearmed lever.
In Figs. 1 and 1 /a the arrangement of the known positioning device provided with a prismatic frictional guide may be seen, where the object carried 1 is connected through the guide 2 to the base plate 3. The object carrier is brought into motion by means of the operating micrometer-screw 4 fixed to the base plate 3. The operating micrometer-screw 4 is fitting into the slit sleave 6 arranged in the bore of the object carrier 1 and the base plate and it is fixed to the base plats 3 by means of the retainer screw 7 through said sleeve. The actusting screw 8 of the operating micrometer-screw 4 is connected to the object carrier 1 by means of an inserted carrying ring 5.
At the embodiment illustrated in Figs. 2 and 2/a, at the known positioning device provided with a rolling guide, the object carrier 11 is connected by means of the rolling elements 12 to the base plate 13. The object carrier 11 is brought into motion by the aid of the operating micrometer-screw 14. The positioning devices provided with the known sliding and rolling guides, respectively, are characterized by the jerky progressive motion and as a consequence, they are unsuitable for performing more accurate measurements and positioning. Also in this case, the operating micrometer-screw 14 is fixed by means of a retainer-screw 17 to object carrier 11 and to the base plate 13, through an inserted slit sleeve 16. An actuating screw 18 of the operating micrometer-screw 14 is connected by means of the carrying ring 15 to the object carrier 11 in a similar manner, as illustrated in
Fig. 1.
In Fig. 3, 4 and 5 an embodiment of the positioning device according to the invention has been illustrated by way of example. On the base plate 21 of the device extensions 35, 36, 37, 38 and 39 are perpendicularly protruding. To the first extension 35 and to the second extension 36 one end each of two leaf-springs 22 are attached, while a compensating members 23-moveing forth on a parabolic path-is connected to the other ends of said springs.
On end each of the leaf-springs 26 is fixed in the compensating member 23, the other ends are attached to the linearly led support 25, to which the object carrier 24 carrying the unit to be measured and positioned has been fixed.
The forwarding pont A of the pushing rod formed by the suitably selected geometrical arrangement of the friction-and clearancefree transverse leaf-springs and consisting of a second single-armed lever 32 suspended into the transverse-spring-loaded joint 31 at the extension 38 of the base plate 21 is connected by means of a leaf-spring 33 to the support.25.
The point of application B of the second actuating lever is connected through the leafspring-loaded push rod 30 to the forwarding point C of the first actusting lever 28 formed by the suitably selected geometrical arrangement of the friction end clearancesfres transveres leaf-springs and suspended onto the transverse-leaf spring-loaded joint 27 at the extension 37 of the base plate 21. The frameshaped opening of the first actusting lever 28 encloses the support 25 and the compensating member 23. The operating micreometerscrew 29 fixed to the second extension 36 of the base plate 21 is connected to the point of application D of the first actuating lever 28.
The stabilized clearancefree connection between the first actuating lever 28 and the operating micrometer-screw 29 could be achieved by means of the spiral sprint 34 connected to the fifth extension 39 of the base plate 21.
The operation of the positioning device according to the invention is, as follows:
The base plate 21 is fixed onto the stand.
The element, s.g. the optical mirror to be measured and positioned, respectively, in relation to the stand is fixed onto the object carrier 24. The moentary position of the element to be measured and positioned can be continuously read on the dial plate of the operating micrometer-screw 29 in such a manner, that the read values of displacement of the operating micrometer-screw 29 are reduced proportionally to the ratio of the first 28 and the second actuating lever 32. In case, if the ratio of said transmission system amounts to m = 10, the base pitch of 0.01 mm of the operating micrometer-screw 29 corresponds to the displacement of 0.001 mm of the object carrier 24.Linear and elastic guidance of the object carrier 24 in relation to the base plate 21 can be schieved in such a manner that the compensating member 23 moving along on a prabolic path is suspended onto the leafspringe 22 fixed to the first 35 and the second extension 36 of the base plate 21, whereby the leaf-springe 26 are fixed on said compensating member and the support is fixed to said leaf-springs.
The compensating member 23 and the support 25 arranged in the described manner are displaced on congruent parabolic paths turned-off by 1 80' in relation to each other.
As a resultant of the two motions, the support 25 will move on a linear path in relation to the base plate 21.
The advantageous festures of the positioned ing device according to the invention are, as follows: 1/ by the application of the invention the inaccuracy in reproduction due to the jerky sliding, abrasion and contaminations being characteristic of sliding and rolling guides can be eliminated, as a consequence, accuracy of reproduction may be increased by one order of magnitude; 2/ the positioning operating micrometerscrew applied is connected through the suitably selected transmission directly to the object carrier, as a consequence, precision of the pitch can be increased by one order of magnitude; 3/ taking into consideration, that lubrication of the guide becomes superfluous, the range of application broadens--e.g. it can be preferably used in vacuum equipments-,maintenance becomes easier, sensitivity to contaminations decreases; 4/ the positioning device can be produced using the traditional simple technology, thus production becomes economical.
Claims (4)
1. A linear positioning device, preferably to optical measurements, incorporating a base plate, an object carrier and a micrometerscrew, characterized in that on the base plate /21/ protruding extensions /35, 36, 37, 38, 39/ are formed, furthermore between the base plate /21/ and the object carrier /24/ there is a compensating member /23/ and between the support /25/ of the object carrier /24/, the object carrier /24/ itself and the micrometer-screw /29/ there is an actuating lever /28/, whereby the compensating member /23/ is connected to the extensions /35, 36/ of the base plate /21/ by means of leaf-springs /22/ and simultaneously it is connected by leaf-springs /26/ to the support /25/, while said support is connected by a spiral spring /34/ to the extension /38/ of the base plate /21/, furthermore the actuating lever /28/ of the device is connected by means of a transverse-spring-loaded joint /27/ to the extension /37/ of the base plate /21/ and by the leaf-spring to the support of the object carrier and at last the micrometerscrew /29/used through one of the extension /36/ of the base plate /21/is bearing up against the actuating lever /28/.
2. Positioning device as claimed in claim 1, characterized in that the device is provided with a second frame-shaped actuating lever /32/, whereby the first actuating lever /28/-against which the micrometer-screw is bearing upon-is enclosing the compensating member /23/ and the support /25/ of the object carrier only and it is connedted by means of a transverse spring-loaded joint /31/ to one of the extensions /38/ of the base plate /21/ and by a leaf-spring-loaded push rod /30/ to the first actuating lever /28/, simultaneously it is connected to the support /25/ of the object carrier /24/ by means of a leaf-spring /33/.
3. A linear positioning device substantially as described herein with reference to Figs. 3-5 of the accompanying drawings.
4. Any novel element or combination or elements herein described and/or shown in the accompanying drawings, irrespective of whether the present claim is within the scope of, or relates to the same invention as, any of the preceding claims.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB7845528A GB2035564B (en) | 1978-11-22 | 1978-11-22 | Linear positioning device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB7845528A GB2035564B (en) | 1978-11-22 | 1978-11-22 | Linear positioning device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2035564A true GB2035564A (en) | 1980-06-18 |
| GB2035564B GB2035564B (en) | 1983-06-15 |
Family
ID=10501214
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB7845528A Expired GB2035564B (en) | 1978-11-22 | 1978-11-22 | Linear positioning device |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2035564B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0193991A1 (en) * | 1985-03-05 | 1986-09-10 | Koninklijke KPN N.V. | Fine-adjusting device for accurate positioning an adjusting element |
| EP0239337A1 (en) * | 1986-03-24 | 1987-09-30 | Renishaw plc | Position sensing probe |
| WO1988005524A1 (en) * | 1987-01-15 | 1988-07-28 | Fidia S.P.A | Feeler device, particularly for copying machines |
| US7228642B2 (en) | 2004-03-05 | 2007-06-12 | Carl Zeiss Industrielle Messtechnik Gmbh | Probe for a coordinate measuring machine |
-
1978
- 1978-11-22 GB GB7845528A patent/GB2035564B/en not_active Expired
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0193991A1 (en) * | 1985-03-05 | 1986-09-10 | Koninklijke KPN N.V. | Fine-adjusting device for accurate positioning an adjusting element |
| US4691586A (en) * | 1985-03-05 | 1987-09-08 | Staat Der Nederlanden (Staatsbedrijf Der Posterijen, Telegrafie En Telfonie) | Fine-adjusting device for accurate positioning an adjusting element |
| EP0239337A1 (en) * | 1986-03-24 | 1987-09-30 | Renishaw plc | Position sensing probe |
| WO1988005524A1 (en) * | 1987-01-15 | 1988-07-28 | Fidia S.P.A | Feeler device, particularly for copying machines |
| US5119568A (en) * | 1987-01-15 | 1992-06-09 | Fidia S.P.A. | Feeler device, particularly for copying machines |
| JP2564385B2 (en) | 1987-01-15 | 1996-12-18 | フィディーア・ソシエタ・ペル・アチオーニ | Feeler device especially for copiers |
| US7228642B2 (en) | 2004-03-05 | 2007-06-12 | Carl Zeiss Industrielle Messtechnik Gmbh | Probe for a coordinate measuring machine |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2035564B (en) | 1983-06-15 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19921122 |