EP0117585A2 - Continuous smoothing machine with conveying tape for solid surfaces, particularly adapted for slabs of stony material - Google Patents
Continuous smoothing machine with conveying tape for solid surfaces, particularly adapted for slabs of stony material Download PDFInfo
- Publication number
- EP0117585A2 EP0117585A2 EP84200228A EP84200228A EP0117585A2 EP 0117585 A2 EP0117585 A2 EP 0117585A2 EP 84200228 A EP84200228 A EP 84200228A EP 84200228 A EP84200228 A EP 84200228A EP 0117585 A2 EP0117585 A2 EP 0117585A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- tape
- plate
- advancement
- smoothing machine
- slabs
- 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.)
- Withdrawn
Links
- 238000009499 grossing Methods 0.000 title claims abstract description 13
- 239000000463 material Substances 0.000 title description 6
- 239000007787 solid Substances 0.000 title description 2
- 230000006870 function Effects 0.000 claims 1
- 230000000284 resting effect Effects 0.000 claims 1
- 230000012447 hatching Effects 0.000 description 3
- 206010003830 Automatism Diseases 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B7/00—Machines or devices designed for grinding plane surfaces on work, including polishing plane glass surfaces; Accessories therefor
- B24B7/20—Machines or devices designed for grinding plane surfaces on work, including polishing plane glass surfaces; Accessories therefor characterised by a special design with respect to properties of the material of non-metallic articles to be ground
- B24B7/22—Machines or devices designed for grinding plane surfaces on work, including polishing plane glass surfaces; Accessories therefor characterised by a special design with respect to properties of the material of non-metallic articles to be ground for grinding inorganic material, e.g. stone, ceramics, porcelain
- B24B7/224—Portal grinding machines; Machines having a tool movable in a plane
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B7/00—Machines or devices designed for grinding plane surfaces on work, including polishing plane glass surfaces; Accessories therefor
- B24B7/02—Machines or devices designed for grinding plane surfaces on work, including polishing plane glass surfaces; Accessories therefor involving a reciprocatingly-moved work-table
Definitions
- the present invention relates to a machine for roughing, smoothing and finishing solid surfaces, particularly adapted for stony materials.
- the object of the present invention is to realize a machine which adds to the favourable features of the present smoothing machines of tape type that of exploiting almost the 100% of the maximum capacity of the tool.
- a tape-type smoothing machine of which we have schematically indi cated in Fig. 3 one of the several abrasive groups of the same smoothing machine, which group differs from that of Fig. 1 as to the fact that the transversal bridge 2 rests on semicircular guides 3, which allow it to rotate through a same angle ⁇ both in clockwise and anticlockwise sense.
- Figs. 4 to 7 there are indicated the successive positions of the horizontal plate 4 and of the transversal bridge 2 with its inclination ⁇ with respect to the motion of the conveying tape, that is of the slab 1.
- the representation is limited to one abrasive group, even if their number in a smoothing machine really varies from 4 to 13.
- Fig. 3 the plate 4 is in starting position with the bridge 2 inclined of ⁇ .
- ⁇ has been calculated previously according to the speed V N of the conveying tape and the translation speed V M of the plate 4 is also known, at the end of the going run the plate (see Fig. 4) will have worked a horizontal strip which has been indicated by right-hand inclined hatching.
- Fig. 5 the bridge is shown in continuous line before the 2 ⁇ anticlockwise rotation and then in dashed line in the position suitable to allow the plate to start the return run. At the end of the return run the plate (see Fig. 6) will have worked a horizontal strip which has been indicated by left-hand inclined hatching.
- Fig. 7 is merely the repetition,however with clockwise rotation, of the movement illustrated in Fig. 5 for putting the plate in the starting position of Fig. 3 and therefore repeating the operating cycle.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Inorganic Chemistry (AREA)
- Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
Abstract
It is a continuous smoothing machine, which has a device able to allow the abrasive or finishing plates 4 to go through a path inclined of a 90° + a angle during the going run and of a 270° - a angle during the return run, with respect to the longitudinal axis of a conveying tape with continuous motion for the slab 1 to be worked, a being a prefixed angle chosen in such a way as to allow a plate working path substantially perpendicular to the direction of advancement of the tape.
Description
- The present invention relates to a machine for roughing, smoothing and finishing solid surfaces, particularly adapted for stony materials.
- As known, roughing or gaugering, smoothing and finishing are the last stages of working of stony materials and are carried out by means of horizontal circular plates driven to rotary motion and provided with abrading or finishing materials of several kinds on the lower faces.
- About twelve years ago, there appeared on the market the tape type smoothing machines, also called "continuous lines", in which abrading and finishing plates simultaneously driven to rotary motion and to alternating translatory motion perpendicular to the cont inous motion of the tape act simultaneously on horizontal slabs.
- Due to their rate of production, these machines have had a wide and deserved diffusion and, even if different from each other in the several models, have basically won the market of the stony industry.
- We now analyze the opertion of any known abrasive plate, by considering Fig. 1, wherein we have designated with VN the speed vector of the tape, caused to advance in the direction of its longitudinal axis, and therefore of the superimposed slab, with 1 the moving slab having width L, with 2 a stationary trans versal bridge which rests on
bases 3 and further represents the path of theplate 4 with speed vector V . - In Fig. 2 we have indicated by hatching the slab zone already worked by the
plate 4, which, having ended the going run A-B, is going to start again for the return run B-C. The virgin area worked by the plate during any run, VN, VM and L remaining constant, will be an isosceles triangle with height L, base A-C = 2 tang α ·L and vertex angle = 2 α, caused by the vectorial composition of VN and V ; it is obtained sin α = V N . - This fact will appear clearer if we imagine the tape stationa ry and the transversal bridge in motion towards the top part of the drawing. The work of the plate during its running of the length B-C with its higher edge and at speed VM will be constitu ted by removal of a given thickness of material with a width which varies from 0 at point B to a maximum value max =
A-C 2 tangα. L. - Its average value will therefore be equal to
- We add that in these conditions of employment we can never have a constant optimal pressure due to the continuous change of the new surface to be worked and, similarly, we can never have a constant optimal amount of cooling and washing water, due to the continuous change of the volume of removed material.
- The object of the present invention is to realize a machine which adds to the favourable features of the present smoothing machines of tape type that of exploiting almost the 100% of the maximum capacity of the tool.
- According to the invention such an object is reached by a tape-type smoothing machine, of which we have schematically indi cated in Fig. 3 one of the several abrasive groups of the same smoothing machine, which group differs from that of Fig. 1 as to the fact that the
transversal bridge 2 rests onsemicircular guides 3, which allow it to rotate through a same angle α both in clockwise and anticlockwise sense. - In Figs. 4 to 7 there are indicated the successive positions of the
horizontal plate 4 and of thetransversal bridge 2 with its inclination α with respect to the motion of the conveying tape, that is of the slab 1. - As already said, the representation is limited to one abrasive group, even if their number in a smoothing machine really varies from 4 to 13.
- In Fig. 3 the
plate 4 is in starting position with thebridge 2 inclined of α. As α has been calculated previously according to the speed V N of the conveying tape and the translation speed VM of theplate 4 is also known, at the end of the going run the plate (see Fig. 4) will have worked a horizontal strip which has been indicated by right-hand inclined hatching. - In Fig. 5 the bridge is shown in continuous line before the 2α anticlockwise rotation and then in dashed line in the position suitable to allow the plate to start the return run. At the end of the return run the plate (see Fig. 6) will have worked a horizontal strip which has been indicated by left-hand inclined hatching.
- Fig. 7 is merely the repetition,however with clockwise rotation, of the movement illustrated in Fig. 5 for putting the plate in the starting position of Fig. 3 and therefore repeating the operating cycle.
- It should be noted that the anticlockwise and clockwise rotations of the
bridge 2 as shown in Figs. 5 and 7 allow theplate 4 to work perfectly the lateral edges of the slab 1. - We know the maximum length α max, equal to A-C of Fig. 2, the slab width L and the plate speed V . From Fig. 5 we see that due to the rotation of the bridge, the plate is moved upwards of ρ'=tang α.L. and, having put ρ' slightly shorter than ρ max for the reasons which will be explained later, we can obtain tang and subsequently α and sin α .
- By adjusting the tape speed at the value V =sin α. VM, we will be sure to have a resultant V - V perpendicular to V , as it was our intention. The fact that (ρ' has been put shorter than ρ max in the calculation depends on the advancement of the tape during the time t employed for the rotation, multiplied by V ; R N the total width of the strip will therefore be tang α . L +tR. VN, which we will obviously find, through simple calculations, substantially equal to ρ max, as it was our intention; if the total length is very different from ρ max, we will find ρ"=ρ'.ρmax/ (tang α.L+tR. V
- We omit to describe the several automatisms already used for adjusting the work width, the lowering or rising of the plates, the tape speed and so on, which are widely known.
- Practical calculations on slabs as wide as 1.60 ms have shown that, against a tape speed of 45,7 cms/min of a conventional smoothing machine, a machine according to the invention allows to obtain with α=4.61° an almost double speed. This justifies the expenses for the construction of the semicurcular guides and the control for the rotation of the transversal bridges at each end of run.
Claims (3)
1. Continuous smoothing machine with conveying tape, charvacte rized in that is comprises at least one smoothing plate which is movable transversally to the direction of advancement of the tape with going and return paths alternately inclined of the same angle in opposite senses with respect to the direction of advancement of the tape.
2. Smmothing machine according to claim 1, characterized in that the angle of inclination of said paths is chosen, as a func tion of the tape advancement speed and the plate translation speed, in such a way as to allow the plate a working path substantially perpendicular to the direction of advancement of the tape.
3. Smoothing machine according to claim 1, characterized in that said plate is movable along a transversal rotatable bridge resting on curved end guides.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT19770/83A IT1193685B (en) | 1983-02-25 | 1983-02-25 | CONTINUOUS BELT CONVEYOR BELT SANDER FOR SOLID SURFACES, PARTICULARLY SUITABLE FOR STONE MATERIAL SLABS |
IT1977083 | 1983-02-25 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0117585A2 true EP0117585A2 (en) | 1984-09-05 |
EP0117585A3 EP0117585A3 (en) | 1986-08-27 |
Family
ID=11161079
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP84200228A Withdrawn EP0117585A3 (en) | 1983-02-25 | 1984-02-18 | Continuous smoothing machine with conveying tape for solid surfaces, particularly adapted for slabs of stony material |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0117585A3 (en) |
IT (1) | IT1193685B (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2584965A1 (en) * | 1985-07-16 | 1987-01-23 | Pele Cie | Method and apparatus for polishing plates (slabs) |
EP0422610A2 (en) * | 1989-10-10 | 1991-04-17 | Hermann Hofmann | Process and use of an apparatus for shaping the upper surface of articles, in particular stones, through burning or scabbling |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5081794A (en) | 1990-08-17 | 1992-01-21 | Haney Donald E | Sander with orbiting platen and abrasive |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE141716C (en) * | ||||
GB972693A (en) * | 1959-11-07 | 1964-10-14 | Luigi Colombi | Machine for smoothing and polishing natural and artificial stone surfaces |
US3519908A (en) * | 1967-09-19 | 1970-07-07 | Patch Wegner Co Inc | Plural motor pattern control system for surface treating machines |
DE2740696A1 (en) * | 1977-09-09 | 1979-03-15 | Steinbearbeitungs Maschinenfab | Grinder or polisher for faces stones - has work face on table moved with circular movement superimposed on linear feed |
DE2811894A1 (en) * | 1978-03-18 | 1979-10-04 | Michael Voit Maschinenfabrik | Stone polishing machine with horizontal work-table - has rotating polishing stone rotated about vertical axis whilst driven on spindle parallel to table |
-
1983
- 1983-02-25 IT IT19770/83A patent/IT1193685B/en active
-
1984
- 1984-02-18 EP EP84200228A patent/EP0117585A3/en not_active Withdrawn
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE141716C (en) * | ||||
GB972693A (en) * | 1959-11-07 | 1964-10-14 | Luigi Colombi | Machine for smoothing and polishing natural and artificial stone surfaces |
US3519908A (en) * | 1967-09-19 | 1970-07-07 | Patch Wegner Co Inc | Plural motor pattern control system for surface treating machines |
DE2740696A1 (en) * | 1977-09-09 | 1979-03-15 | Steinbearbeitungs Maschinenfab | Grinder or polisher for faces stones - has work face on table moved with circular movement superimposed on linear feed |
DE2811894A1 (en) * | 1978-03-18 | 1979-10-04 | Michael Voit Maschinenfabrik | Stone polishing machine with horizontal work-table - has rotating polishing stone rotated about vertical axis whilst driven on spindle parallel to table |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2584965A1 (en) * | 1985-07-16 | 1987-01-23 | Pele Cie | Method and apparatus for polishing plates (slabs) |
EP0422610A2 (en) * | 1989-10-10 | 1991-04-17 | Hermann Hofmann | Process and use of an apparatus for shaping the upper surface of articles, in particular stones, through burning or scabbling |
EP0422610A3 (en) * | 1989-10-10 | 1991-08-28 | Hermann Hofmann | Process and apparatus for shaping the upper surface of articles, in particular stones, through burning or scabbling |
Also Published As
Publication number | Publication date |
---|---|
IT1193685B (en) | 1988-07-21 |
EP0117585A3 (en) | 1986-08-27 |
IT8319770A0 (en) | 1983-02-25 |
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18D | Application deemed to be withdrawn |
Effective date: 19870228 |