EP0437831A1 - Lapping head with floating grinders for rocky materials, particularly for granite slabs - Google Patents
Lapping head with floating grinders for rocky materials, particularly for granite slabs Download PDFInfo
- Publication number
- EP0437831A1 EP0437831A1 EP90125427A EP90125427A EP0437831A1 EP 0437831 A1 EP0437831 A1 EP 0437831A1 EP 90125427 A EP90125427 A EP 90125427A EP 90125427 A EP90125427 A EP 90125427A EP 0437831 A1 EP0437831 A1 EP 0437831A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- attached
- floating
- grinders
- collar
- lapping head
- 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
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
- B24B41/00—Component parts such as frames, beds, carriages, headstocks
- B24B41/04—Headstocks; Working-spindles; Features relating thereto
- B24B41/047—Grinding heads for working on plane surfaces
- B24B41/0475—Grinding heads for working on plane surfaces equipped with oscillating abrasive blocks, e.g. mounted on a rotating head
Definitions
- the invention concerns a lapping bead with floating grinders for rocky materials, particularly suited to lap granite slabs.
- Said lapping heads consist of a main body having a cylindrical or polyhedral shape and supporting a plurality of grinders around its outer periphery.
- the head is made to rotate around its own vertical axis, so that the grinders around its periphery are also brought into rotation.
- each of the grinders is also made to float around a horizontal axis.
- the lapping of the slab is, therefore, obtained by the abrasive action of the grinders, which combine the rotational motion around a vertical axis with the floating motion on a vertical plane of each one of them.
- the rotational motion of the head and the floating motion of the grinders are obtained through a kinematic device consisting of a pinion gear engaging at the same time two cogged wheels, which are co-axial to each, one of them being attached to the main head body, while the other one is attached to a cam.
- the pinion gear rotates, it causes the rotation of both cogged wheels, causing, therefore, both the rotation of the head main body and the rotation of the cam. While the latter is rotating, it contrasts against some levers which are connected with the grinder-supporting shafts and thereby causes the floating movements of the grinders.
- the cam rotates with a speed which slightly differs from the speed of the main body of the lapping head. Therefore, the number of floating motions per minute of the grinders is noticeably lower than the number of r.p.m. of the head body. The number of said floating motions is, moreover, reduced in direct proportion to the relative speed between the two cogged wheels and, therefore, in direct proportion to the difference of their numbers of cogs.
- a further inconvenience consists in that the presence of the floating levers activating the grinder-holding shafts extend tangentially and thereby reduce the number of grinders which can be mounted on each lapping head in relation to its diameter.
- the lapping heads of the known type require an accurate setup when they are assembled, particularly concerning the positioning of the floating elements of the grinders in relation to the cam outline. In any case, regardless of the accuracy of both the cam outline and of the assembly, there will always be a small slack which tends to increase as time goes by.
- the purpose of the present invention is to eliminate said inconveniences and its main purpose, in particular, is the disclosure of a lapping head with floating grinders, presenting a simpler and less costly construction than the laping heads of the known type.
- Another purpose is to disclose a lapping head able to stand shocks and accidental dynamic loads without being damaged.
- Another purpose is for the lapping head according to the invention not to require difficult adjustments or adaptations at the time of its assembly.
- Another purpose of the invention is for the lapping head to operate reliably and to require as little maintenance as possible.
- the lapping head of the invention to allow the assembly of a higher number of floating grinders than the lapping heads of the known type having the same peripheral dimensions.
- the central eccentric collar is rigidly connected with the pinion gear through a pin connection and its outer diameter, which is eccentric in relation to the inner hole within which it is coupled with the vertical shaft, is slidingly keyed within a cylinder-shaped collar.
- the cylinder-shaped collar is bound through pivots to planetary eccentric collars, preferably three in number, which are lodged within seats which are machined within the lower box.
- the central eccentric collar and the planetary eccentric collars present the same degree of eccentricity, so that, while the central eccentric collar is rotating, the cylinder shaped collar to which it is keyed is forced to follow it and each part of its surface performs in relation to the lower box a plurality of revolutions having a radius corresponding to the value of eccentricity of the eccentric collars.
- One or more pistons are arranged each within a radial slot obtained within the cylinder-shaped collar and they are connected with levers, which are connected in turn with the shafts supporting the grinders. Through the levers which are connected with the shafts supporting the grinders, said pistons transmit to the latter only the tangential component of the rotating motion of the cylinder-shaped collar, thereby making the floating motion of the grinders possible.
- a very simple and inexpensive lapping head is obtained, which does not require complex adjustment and setup operations while it is being assembled.
- the lapping head according to the invention does not require much maintenance when used, although it presents a high degree of reliability, a reduced rate of wear and tear and a high capability of absorbing dynamic loads and shocks.
- the lapping head according to the invention which is indicated as a whole with 1, presents a body 20 containing all the kinematic elements and consisting of a lower box 22, on the top of which is attached through suitable means, for instance screws 25, an upper lid 21 presenting a central axial hole 23. Whithin hole 23 of the upper lid 21 is assembled an eccentric flange 3 which is not allowed to rotate, since it is attached by means of a pin 4 to a fork 5, which in turn is solidly attached to the base 24 of the lapping machine.
- a ring gear with inner cogs 7 is attached to the inner face of the upper lid 21. Therefore, said ring gear is also attached to the lower box 22 and to the body 20 of the lapping head.
- the pinion gear 6 which engages the inner cogs of the ring gear 7 is coupled by means of bearing with the outer part of the eccentric flange 3, while a vertical shaft 2 is coupled through bearings with the inside of the hole 31 of the same eccentric flange 3.
- Said shaft is attached to the lower box 22 by means of suitabble connecting mechanical elements, for instance a nut 33 which is screwed on the thread 34 of its lower end.
- a radial slot 8 is machined on the pinion gear 6.
- a pivot 9 is bound within said slot and it is fixed within a seat 42 which is obtained within a central eccentric collar 10, which is slidingly keyed around the intermediate diameter 35 of the vertical shaft 2 preferably through the interposition of a bearing 36.
- Pivot 9 allows pinion gear 6, while rotating, to bring the central eccentric collar 10 into rotation, too. Therefore collar 10 also has a rotating movement in relation to the intermediate diameter 35 of the shaft 2, which acts as its rotational pivot.
- the central eccentric collar 10 in turn is keyed , preferably through a bearing 38, within the cylinder-shaped collar 11, which is bound to the lower box 22 by means of three pins 12, each of which is connected with its own planetary eccentric collars 13, lodged within suitable seats 36 machined within the lower box 22.
- Said planetary eccentric collars 13, as can be observed more closely in Fig. 2, are arranged one in relation to the other preferably at an alpha angle measuring 120 degrees around the center of the rotational vertical shaft 2. It will, however, be specifically pointed out that this embodiment can be varied, in that the number of planetary eccentric collars 13 can be in a number differring from three.
- the central eccentric 10 and the planetary eccentrics 13 present the same degree of eccentricity 14, so that the cylinder-shaped collar 11 is forced to follow the central eccentric collar 10 during its rotational movement and each of its points describes, therefore, a circular trajectory having a radius, the value of which equals the value of the eccentricity 14. Therefore, when the vertical shaft 2 is brought into rotation, it causes the rotation of the body 20 of the lapping head and of the ring gear 7, which is attached to it, of the pinion gear 6 engaging the ring gear 7, of the central eccentric collar 10 connected with the pinion gear 6 and of the cylinder-shaped collar 11, which is coupled with the central eccentric 10, all of these elements turning around one and the same vertical axis 36.
- each point of the cylinder-shaped collar 11 describes, in relation to the lower box 22, a circumference having a radius equalling the degree of eccentricity 14 of the central eccentric collar 10 and of the planetary eccentric collars 13.
- Some horizontal slots 15 having a radial arrangement are machined within the cylinder-shaped collar 11.
- they are four in number and are arranged at an angle of 90 degrees from each other.
- the embodiment can be varied, by matching the number of slots with the number of grinders 40 to be assembled, depending on the outer dimensions of the body 20 of the lapping head, as will be better explained hereafter.
- each of the slots 15 lodges a cylinder piston 16 complete with a transversal hole 41, into which a lever 17 is inserted and attached to a shaft 18. It has been said that, while the central shaft 2 is rotating, each point of the cylinder-shaped collar 11 describes, in relation to the lower box 22, a circumference having a radius equalling the degree of eccentricity 14 of the eccentric collars 10 and 13. It is known that each circular motion can be broken out into the sum of two elementary motions, one of them being radial while the other one is tangential.
- support 19 on which the grinder 40 is applied accomplishes a hunting motion in a vertical plane which is parallel to the vertical axis 36 around which body 20 and, therefore, the entire lapping head rotate.
- the hunting plane of support 19 and, therefore, of grinder 40 attached to it can also be arranged with a direction differring from the vertical.
- the number of slots obtained in the cylinder-shaped collar 11 can be different from four.
- the number of these slots is equal to the number of the shafts 18 and , therefore, of the supports 19 with their respective grinders 40, which are assembled on body 20 of the lapping head. Since the support 19 of each grinder 40 has a well defined tangential dimension, it will follow that the maximum number of slots 15 which can be machined in the cylinder-shaped collar 11 is equal to the maximum number of grinders 40 which can be applied to body 20, depending on its outer diameter. From the foregoing description it can be understood that the lapping head according to the invention reaches all the proposed purposes.
- the lapping head according to the invention can be provided around its periphery with any number of grinders 40 and, as a consequence, of shafts 18, depending on the outer diameter of the lapping head and on the bulk of the grinders. It has also been said that, at the discretion of the manufacturer, the number of the planetary eccentric collars 13 belonging to the lapping head can be varied, as can be varied the number of cogs of the pinion gear 6 and of the ring gear 7, so as to obtain the transmission ratio between the two which best suits the specific requirements.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
- Walking Sticks, Umbrellas, And Fans (AREA)
- Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)
Abstract
Description
- The invention concerns a lapping bead with floating grinders for rocky materials, particularly suited to lap granite slabs.
- It is a known fact that the lapping of marble, granite and other rocky material slabs is done through lapping heads presenting some abrasive sections. Said lapping heads consist of a main body having a cylindrical or polyhedral shape and supporting a plurality of grinders around its outer periphery. The head is made to rotate around its own vertical axis, so that the grinders around its periphery are also brought into rotation. At the same time each of the grinders is also made to float around a horizontal axis. The lapping of the slab is, therefore, obtained by the abrasive action of the grinders, which combine the rotational motion around a vertical axis with the floating motion on a vertical plane of each one of them.
- In some of the known types of lapping heads the rotational motion of the head and the floating motion of the grinders are obtained through a kinematic device consisting of a pinion gear engaging at the same time two cogged wheels, which are co-axial to each, one of them being attached to the main head body, while the other one is attached to a cam. When the pinion gear rotates, it causes the rotation of both cogged wheels, causing, therefore, both the rotation of the head main body and the rotation of the cam. While the latter is rotating, it contrasts against some levers which are connected with the grinder-supporting shafts and thereby causes the floating movements of the grinders. Since the two cogged wheels present each a number of cogs slightly differring from each other, the cam rotates with a speed which slightly differs from the speed of the main body of the lapping head. Therefore, the number of floating motions per minute of the grinders is noticeably lower than the number of r.p.m. of the head body. The number of said floating motions is, moreover, reduced in direct proportion to the relative speed between the two cogged wheels and, therefore, in direct proportion to the difference of their numbers of cogs.
- One of the inconveniences presented by this type of lapping heads is the high maintenance rate they require. In fact, since the pinion gear rotates at a very high speed rate, it needs to be constantly and perfectly lubricated. Should this lubrication be missing even for a short period of time, a rapid damaging of the pinion gear, of the cogged wheels and of the ball bearings would occur, especially because of the particular environment where the device operates, which is characterized by the presence of highly abrasive dust.
- This inconvenience is avoided by the device described in the patent application No. 85561/a/89 in the name of the same inventor of the present patent, wherein the lapping head is made without the pinion gear rotating at a high speed rate, so that the unit providing the rotation of the head and the floatation of the grinders is reduced to the two cogged wheels only.
- Even the lapping head made in accordance with the mentioned patent application, and the other known lapping heads present further inconveniences, the most important of which is represented by the fact that the cam causing the floating motions of the grinders is very costly to manufacture because it is difficult to obtain its geometrical precision. In fact, should its geometrical shape not be perfect, the grinders would have differing floating motions and, therefore, one grinder would work differently from another.
- Another inconvenience consists in that the contact between the cam and the grinder-supporting shafts is practically punctiform and it is at any rate limited to a segment of much reduced length. This causes considerable wear and tear of the contact points while the machine is in operation, because of the high specific loads. This also reduces considerably the ability to absorb shocks and dynamic loads.
- A further inconvenience consists in that the presence of the floating levers activating the grinder-holding shafts extend tangentially and thereby reduce the number of grinders which can be mounted on each lapping head in relation to its diameter.
- Not the least inconvenience is caused by the fact that the lapping heads of the known type require an accurate setup when they are assembled, particularly concerning the positioning of the floating elements of the grinders in relation to the cam outline. In any case, regardless of the accuracy of both the cam outline and of the assembly, there will always be a small slack which tends to increase as time goes by.
- The purpose of the present invention is to eliminate said inconveniences and its main purpose, in particular, is the disclosure of a lapping head with floating grinders, presenting a simpler and less costly construction than the laping heads of the known type.
- Another purpose is to disclose a lapping head able to stand shocks and accidental dynamic loads without being damaged.
- Another purpose is for the lapping head according to the invention not to require difficult adjustments or adaptations at the time of its assembly.
- Another purpose of the invention is for the lapping head to operate reliably and to require as little maintenance as possible.
- Not the least purpose is for the lapping head of the invention to allow the assembly of a higher number of floating grinders than the lapping heads of the known type having the same peripheral dimensions.
- The described purposes and others which will become better understood hereafter are reached by the disclosure of a lapping head with floating grinders, which, in accordance with the patent claims, includes:
- a main body consisting of a lower box, which is closed by an upper lid attached to it and presenting an axial hole,
- a ring gear having its inner cogs attached to the inner face of the lid and being co-axial with its axial hole;
- an eccentric flange attached to the base of the lapping machine and presenting an axial hole and being freely coupled within the axial hole of the upper lid;
- a vertical shaft coupled with a power take-off, passing co-axially through the hole of the eccentric flange with which it is coupled by means of bearings, said shaft having one of its ends attached to the lower box through connecting means;
- a pinion gear engaging with the ring gear having inner cogs, and coupled outwardly with the eccentric flange by means of bearings;
- a plurality of grinders arranged around the periphery of the lower box, each being attached to a support being held by a shaft connected to the kinematic elements conveying the motion, which are contained within the lower box,
and is characterized in that a central eccentric collar, which is coupled with the shaft at the latter intermediate length and is rigidly attached to the pinion gear by means of connecting elements, co-operates through a cylinder-shaped collar and through mechanical connecting means with both eccentrical planetary rings coupled with the lower box, and with each shaft connected with the support of the grinders, and makes possible the floating motion of each grinder when the vertical shaft rotates and causes the rotation of the main body of the lapping head to which it is attached. - According to a preferred embodiment of the invention, the central eccentric collar is rigidly connected with the pinion gear through a pin connection and its outer diameter, which is eccentric in relation to the inner hole within which it is coupled with the vertical shaft, is slidingly keyed within a cylinder-shaped collar. The cylinder-shaped collar is bound through pivots to planetary eccentric collars, preferably three in number, which are lodged within seats which are machined within the lower box. The central eccentric collar and the planetary eccentric collars present the same degree of eccentricity, so that, while the central eccentric collar is rotating, the cylinder shaped collar to which it is keyed is forced to follow it and each part of its surface performs in relation to the lower box a plurality of revolutions having a radius corresponding to the value of eccentricity of the eccentric collars. One or more pistons are arranged each within a radial slot obtained within the cylinder-shaped collar and they are connected with levers, which are connected in turn with the shafts supporting the grinders. Through the levers which are connected with the shafts supporting the grinders, said pistons transmit to the latter only the tangential component of the rotating motion of the cylinder-shaped collar, thereby making the floating motion of the grinders possible.
- Advantageously, according to the described embodiment, a very simple and inexpensive lapping head is obtained, which does not require complex adjustment and setup operations while it is being assembled.
- Also advantageously the lapping head according to the invention does not require much maintenance when used, although it presents a high degree of reliability, a reduced rate of wear and tear and a high capability of absorbing dynamic loads and shocks.
- Further scope of applicability of the present invention will become apparent from the detailed description given hereinafter. However, it should be understood that the detailed description and the specific example, while indicating a preferred embodiment of the invention, are given by way of illustration only, since various changes and modifications within the spirit and scope of the invention will become apparent to those skilled in the art from this detailed description and from the drawings, wherein:
- Fig. 1 shows a longitudinal cross-section of the lapping head according to the invention;
- Fig. 2 is a plan view of the lapping head of Fig. 1, cross-sectioned on a trasversal plane.
- With reference to the Figs. 1 and 2 it can be observed that the lapping head according to the invention, which is indicated as a whole with 1, presents a
body 20 containing all the kinematic elements and consisting of alower box 22, on the top of which is attached through suitable means, forinstance screws 25, anupper lid 21 presenting a centralaxial hole 23. Whithinhole 23 of theupper lid 21 is assembled aneccentric flange 3 which is not allowed to rotate, since it is attached by means of apin 4 to a fork 5, which in turn is solidly attached to thebase 24 of the lapping machine. A ring gear withinner cogs 7 is attached to the inner face of theupper lid 21. Therefore, said ring gear is also attached to thelower box 22 and to thebody 20 of the lapping head. The pinion gear 6 which engages the inner cogs of thering gear 7 is coupled by means of bearing with the outer part of theeccentric flange 3, while avertical shaft 2 is coupled through bearings with the inside of thehole 31 of the sameeccentric flange 3. Said shaft is attached to thelower box 22 by means of suitabble connecting mechanical elements, for instance anut 33 which is screwed on thethread 34 of its lower end. It can, therefore, be understood how, by causing the rotation of thevertical shaft 2, if itsend 50 is connected with a power take-off belonging to the lapping machine, theentire body 20 is also brought into rotation, so that thering gear 7, engaging the pinion gear 6, causes the latter to rotate. - It can be observed, especially in Fig. 1, that the pinion gear 6 is completely contained within the inner diameter of the
ring gear 7 and, therefore, presents a smaller number of cogs than the latter. - As a consequence, when the
body 20 and, therefore, thering gear 7 rotate, the pinion gear 6 rotates at a speed rate which slightly exceeds the speed ofbody 20, the difference in speed varying in relation to the difference in the number of cogs between thering gear 7 and the pinion gear 6. - It will also be observed that a
radial slot 8 is machined on the pinion gear 6. Apivot 9 is bound within said slot and it is fixed within aseat 42 which is obtained within a centraleccentric collar 10, which is slidingly keyed around theintermediate diameter 35 of thevertical shaft 2 preferably through the interposition of abearing 36.Pivot 9 allows pinion gear 6, while rotating, to bring the centraleccentric collar 10 into rotation, too. Thereforecollar 10 also has a rotating movement in relation to theintermediate diameter 35 of theshaft 2, which acts as its rotational pivot. - The central
eccentric collar 10 in turn is keyed , preferably through abearing 38, within the cylinder-shaped collar 11, which is bound to thelower box 22 by means of threepins 12, each of which is connected with its own planetaryeccentric collars 13, lodged withinsuitable seats 36 machined within thelower box 22. Said planetaryeccentric collars 13, as can be observed more closely in Fig. 2, are arranged one in relation to the other preferably at an alpha angle measuring 120 degrees around the center of the rotationalvertical shaft 2. It will, however, be specifically pointed out that this embodiment can be varied, in that the number of planetaryeccentric collars 13 can be in a number differring from three. - The central eccentric 10 and the
planetary eccentrics 13 present the same degree ofeccentricity 14, so that the cylinder-shaped collar 11 is forced to follow the centraleccentric collar 10 during its rotational movement and each of its points describes, therefore, a circular trajectory having a radius, the value of which equals the value of theeccentricity 14. Therefore, when thevertical shaft 2 is brought into rotation, it causes the rotation of thebody 20 of the lapping head and of thering gear 7, which is attached to it, of the pinion gear 6 engaging thering gear 7, of the centraleccentric collar 10 connected with the pinion gear 6 and of the cylinder-shapedcollar 11, which is coupled with the central eccentric 10, all of these elements turning around one and the samevertical axis 36. Moreover, at the same time while this rotation around the vertical axis 6 is taking place, each point of the cylinder-shapedcollar 11 describes, in relation to thelower box 22, a circumference having a radius equalling the degree ofeccentricity 14 of the centraleccentric collar 10 and of the planetaryeccentric collars 13. - Some
horizontal slots 15 having a radial arrangement are machined within the cylinder-shapedcollar 11. In the embodiment illustrated in Fig. 2 they are four in number and are arranged at an angle of 90 degrees from each other. In this case, too, the embodiment can be varied, by matching the number of slots with the number ofgrinders 40 to be assembled, depending on the outer dimensions of thebody 20 of the lapping head, as will be better explained hereafter. - Each of the
slots 15 lodges acylinder piston 16 complete with atransversal hole 41, into which alever 17 is inserted and attached to ashaft 18. It has been said that, while thecentral shaft 2 is rotating, each point of the cylinder-shapedcollar 11 describes, in relation to thelower box 22, a circumference having a radius equalling the degree ofeccentricity 14 of theeccentric collars cylinder 16 lodged within eachslot 15, it is bound to the cylinder-shapedcollar 11, as far as its tangential motions are concerned, since, because it is lodged within the mentionedslot 15, it is forced to follow the cylinder-shapedcollar 11 during its rotation. Saidcylinder 16, on the contrary, is free to move radially withinslot 15, since thelever 17 to which it is bound is free to move within theslot 28 obtained underneathslot 15. As a consequence of this, it happens that the cylinder-shapedcollar 11 during its rotation imparts tocylinder 16 exclusively the tangential component of its circular motion, while the radial component is nullified by the fact that the connection between thecylinder 16 and theslot 15 is sliding, so that no force is transmitted. The result of this is that the circular motion of the cylinder-shapedcollar 11 transmits, throughpiston 16 and itslever 17, to each shaftt 18 a hunting rotational motion around thehorizontal axis 39. - As a consequence,
support 19 on which thegrinder 40 is applied accomplishes a hunting motion in a vertical plane which is parallel to thevertical axis 36 around whichbody 20 and, therefore, the entire lapping head rotate. - In another possible embodiment of the invention the hunting plane of
support 19 and, therefore, ofgrinder 40 attached to it can also be arranged with a direction differring from the vertical. - It has already been said that the number of slots obtained in the cylinder-shaped
collar 11 can be different from four. In fact, it has been observed that the number of these slots is equal to the number of theshafts 18 and , therefore, of thesupports 19 with theirrespective grinders 40, which are assembled onbody 20 of the lapping head. Since thesupport 19 of eachgrinder 40 has a well defined tangential dimension, it will follow that the maximum number ofslots 15 which can be machined in the cylinder-shapedcollar 11 is equal to the maximum number ofgrinders 40 which can be applied tobody 20, depending on its outer diameter. From the foregoing description it can be understood that the lapping head according to the invention reaches all the proposed purposes. - First of all, the purpose of manufacturing a lapping head presenting a simple construction at a lower cost than the lapping heads of the known type has been reached. It has, in fact, been described that the cam, which while rotating imparts the floating motion to the grinder-supporting shafts has been eliminated. It has been replaced by the central
eccentric collar 10, the cylinder-shapedcollar 11 keyed to the former and by the planetaryeccentric collars 13, all of these elements having a cylindrical outline, which can easily be obtained with a turning operation. - The purpose of obtaining a lapping head whose inner components are not subject to much wear and tear has also been reached. In fact, it can be observed that, while in the laping heads of the known type the floating motion of the grinders is obtained because of the contact of the cam against the levers of the shafts through the interposition of contrasting and rolling elements, so that the ensuing contact is practically punctiform, all the inner components of the lapping head according to the invention present very large contact surfaces, extremely reduced specific loads and, as a consequence, irrelevant wear and tear. Again as a consequence of this fact, the lapping head according to the invention is also sturdy enough to stand dynamic loads or accidental shocks, without undergoing any damage.
- The purpose of obtaining a lapping head not requiring complicated adjustment and setup operations during its assembly has also been reached. In fact, since the kinematic elements of the lapping head according to the invention are obtained by turning and they present cogs, so that they all rotate, they do not present any difficulty of assembly, since they easily match each other if the they have been manufactured with the tolerances required by the drawing.
- The purpose of obtaining a lapping head whereon more grinders can be assembled than on the lapping heads of the known type, their diameters being the same, has also been reached. In fact, as can be seen by observing the Figs. 1 and 2, the
levers 17 activating theshafts 18 connected with thesupports 19 of thegrinders 40, present an exclusively vertically protruding bulk, while the bulk of the levers activating the shafts supporting the grinders in the lapping heads of the known type develop their bulk in the tangential direction, since they must come into contact through their contrasting elements with the shaped surface of the activating cam. It is easy to understand that this decreases the number of grinders which can be assembled around the periphery of the lapping head body, because of the presence of said levers, which are arranged in a tangential direction. Moreover, it will be observed that the connection between eachlever 17 and itsrespective cylinder 16, sliding withinslot 15 in the cylinder-shapedcollar 11, presents a much reduced bulk even in the vertical direction ofaxis 36, as compared to the contrasting elements activating the levers causing the rotation of the grinders in the lapping heads of the known type. Therefore, the lapping head according to the present invention presents also a reduced axial bulk as compared to the lapping heads of the known type, their respective diameters being equal. - It has been said that during the manufacturing phase the lapping head according to the invention can be provided around its periphery with any number of
grinders 40 and, as a consequence, ofshafts 18, depending on the outer diameter of the lapping head and on the bulk of the grinders. It has also been said that, at the discretion of the manufacturer, the number of the planetaryeccentric collars 13 belonging to the lapping head can be varied, as can be varied the number of cogs of the pinion gear 6 and of thering gear 7, so as to obtain the transmission ratio between the two which best suits the specific requirements. Furthermore, the systems connecting and joining the kinematic elements forming the lapping head can be varied and modified in shape and number, while it is understood that, in any case all these modifications and variations will not exceed the spirit and the scope of the present invention, such as it is defined by the following claims.
Claims (6)
- A lapping head with floating grinders comprises:- a body (20) consisting of a lower box (22) closed at the top by an upper lid (21) attached to it and presenting an axial hole (23);- a ring gear (7) with inner cogs, attached to the inner face of the upper lid (21) and co-axial with its axial hole (23);- An eccentric flange (3) attached to the base (24) of the lapping machine, presenting an axial hole (31) and freely keyed within the axial hole (23) of the upper lid (21);- a vertical shaft (2) coupled with a power take-off passing axially through the hole (31) of the eccentric flange (3) with which it is coupled through bearings (32), said shaft (2) presenting one end (34) which is attached to the lower box (22) through suitable fastening means (33);- a pinion gear (6) engaging the ring gear (7) having inner cogs and being coupled with the eccentric flange (3) by means of bearings (61);- a plurality of grinders (40) arranged around the periphery of the lower box (22), each being attached to a support (19) supported by a shaft (18) which is connected to the kinematic elements conveying the motion and being contained within the lower box (22),characterized in that a central eccentric collar (10) which is coupled with the vertical shaft (2) at the latter intermediate position and which is rigidly connected with the pinion gear (6) through suitable connecting means (8,9) co-operates through a cylinder-shaped collar (11) and through some mechanical coupling elements (8,9,16,17) both with the planetary eccentric collars (13), coupled with the lower box (22), and with each shaft (18), which is connected with the support (19) holding the grinder (40), wherein the floating motion of each grinder (40) occurs when the vertical shaft (2) rotates and brings into rotation the body (20) of the lapping head to which it is attached.
- A lapping head with floating grinders according to claim 1, characterized in that a pivot (9) attached within a slot (42) obtained in the central eccentric collar (10) and bound within a radial slot (8) obtained in the pinion gear (6) rigidly connects the central eccentric collar (10) with the pinion gear (6).
- A lapping head with floating grinders according to claim 2, characterized in that the pivot (9) attached to the central eccentric collar (10) contrasts against the radial slot (8) of the pinion gear (6) within which it is coupled through contact surfaces (51).
- A lapping head with floating grinders according to claim 1, characterized in that the central eccentric collar (10) is slidingly keyed within the cylinder-shaped collar (11).
- A lapping head with floating grinders according to claim 1, characterized in that the degree of eccentricity (14) of the central eccentric collar (10) is equal to the degree of eccentricity of each one of the planetary eccentric collars (13).
- A lapping head with floating grinders according to claim 1, characterized in that the connection between the cylinder-shaped collar (11) and each shaft (18) connected with the support (19) holding each grinder (40) is obtained through a piston (16) sliding within a radial slot (15) machined in the cylinder-shaped collar (11), said piston being coupled with a lever (17) which is attached to the shaft (18) of each support (19) holding each grinder (40).
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT90125427T ATE96717T1 (en) | 1990-01-18 | 1990-12-24 | POLISHING HEAD WITH SWINGING STONES FOR WORKING STONE MATERIALS, ESPECIALLY GRANITE SLABS. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT85504A IT1240859B (en) | 1990-01-18 | 1990-01-18 | SANDING HEAD WITH OSCILLATING WHEELS FOR STONE MATERIALS, PARTICULARLY GRANITE IN SLABS |
IT8550490 | 1990-01-18 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0437831A1 true EP0437831A1 (en) | 1991-07-24 |
EP0437831B1 EP0437831B1 (en) | 1993-11-03 |
Family
ID=11327145
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP90125427A Expired - Lifetime EP0437831B1 (en) | 1990-01-18 | 1990-12-24 | Lapping head with floating grinders for rocky materials, particularly for granite slabs |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0437831B1 (en) |
AT (1) | ATE96717T1 (en) |
DE (1) | DE69004411T2 (en) |
ES (1) | ES2046665T3 (en) |
IT (1) | IT1240859B (en) |
Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0571340A1 (en) * | 1992-05-22 | 1993-11-24 | CO.ME.S. S.r.l. | Head for polishing machine with oscillating sector holders |
EP0628381A1 (en) * | 1993-05-25 | 1994-12-14 | CO.ME.S. S.r.l. | Head for polishing machine with oscillating sector holders |
EP0657248A1 (en) * | 1993-12-07 | 1995-06-14 | Brema Srl | Improved lapping head for rocky materials, particularly for granite slabs |
EP0737548A1 (en) * | 1995-04-14 | 1996-10-16 | CO.ME.S. S.r.l. | Improved head for polishing machines with supports for oscillating segments |
WO1998051445A1 (en) * | 1997-05-14 | 1998-11-19 | Luigi Pedrini | Polishing head for plate materials in granite, hard stone or ceramic with abrasive segments having continuous oscillating tangential motion |
EP0920957A1 (en) * | 1997-12-04 | 1999-06-09 | Synergy Sarda s.n.c. | Tangential polishing head for lapping granit and glazed stone |
ITFI20080126A1 (en) * | 2008-07-11 | 2010-01-12 | Comes Srl | HEAD FOR THE TREATMENT OF STONE OR CERAMIC MATERIALS |
WO2010106389A1 (en) * | 2009-03-18 | 2010-09-23 | Co.Me.S. S.R.L. | Head for the treatment of stone and ceramic materials |
CN102528658A (en) * | 2012-01-19 | 2012-07-04 | 佛山市科润达机械有限公司 | Sand frame device with rotation and revolution |
CN108943022A (en) * | 2018-08-09 | 2018-12-07 | 张欢 | A kind of radially compliant compensation device |
WO2019184195A1 (en) * | 2018-03-28 | 2019-10-03 | 广东科达洁能股份有限公司 | Eccentric translational polishing head and polisher comprising the polishing head |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102012105610B4 (en) | 2012-06-27 | 2014-11-06 | Technische Universität Kaiserslautern Körperschaft des öffentlichen Rechts | Device for grinding or polishing |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BE420909A (en) * | 1936-04-10 | 1937-05-31 | ||
EP0046604A1 (en) * | 1980-08-25 | 1982-03-03 | Ermanno Pacini | Tool for roughing, smoothing and polishing solid surfaces, particularly adapted for stony materials |
DE8808679U1 (en) * | 1988-07-06 | 1988-11-17 | Wallin, Anders, Lund | Grinding head for surface finishing and polishing of stone, marble and other hard materials |
-
1990
- 1990-01-18 IT IT85504A patent/IT1240859B/en active IP Right Grant
- 1990-12-24 ES ES199090125427T patent/ES2046665T3/en not_active Expired - Lifetime
- 1990-12-24 AT AT90125427T patent/ATE96717T1/en not_active IP Right Cessation
- 1990-12-24 EP EP90125427A patent/EP0437831B1/en not_active Expired - Lifetime
- 1990-12-24 DE DE69004411T patent/DE69004411T2/en not_active Expired - Fee Related
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BE420909A (en) * | 1936-04-10 | 1937-05-31 | ||
EP0046604A1 (en) * | 1980-08-25 | 1982-03-03 | Ermanno Pacini | Tool for roughing, smoothing and polishing solid surfaces, particularly adapted for stony materials |
DE8808679U1 (en) * | 1988-07-06 | 1988-11-17 | Wallin, Anders, Lund | Grinding head for surface finishing and polishing of stone, marble and other hard materials |
Cited By (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0571340A1 (en) * | 1992-05-22 | 1993-11-24 | CO.ME.S. S.r.l. | Head for polishing machine with oscillating sector holders |
EP0628381A1 (en) * | 1993-05-25 | 1994-12-14 | CO.ME.S. S.r.l. | Head for polishing machine with oscillating sector holders |
EP0657248A1 (en) * | 1993-12-07 | 1995-06-14 | Brema Srl | Improved lapping head for rocky materials, particularly for granite slabs |
EP0737548A1 (en) * | 1995-04-14 | 1996-10-16 | CO.ME.S. S.r.l. | Improved head for polishing machines with supports for oscillating segments |
US6273799B1 (en) | 1997-04-14 | 2001-08-14 | Pedrini, S.P.A. | Polishing head for plate materials in granite, hard stone or ceramic with abrasive segments having continuous oscillating tangential motion |
WO1998051445A1 (en) * | 1997-05-14 | 1998-11-19 | Luigi Pedrini | Polishing head for plate materials in granite, hard stone or ceramic with abrasive segments having continuous oscillating tangential motion |
CN1122592C (en) * | 1997-05-14 | 2003-10-01 | 路易吉·贝得利尼 | Polishing head for plate materials in granite, hard stone or ceramic with abrasive segments having continuous oscillating tangential motion |
EP0920957A1 (en) * | 1997-12-04 | 1999-06-09 | Synergy Sarda s.n.c. | Tangential polishing head for lapping granit and glazed stone |
ITFI20080126A1 (en) * | 2008-07-11 | 2010-01-12 | Comes Srl | HEAD FOR THE TREATMENT OF STONE OR CERAMIC MATERIALS |
WO2010004374A1 (en) * | 2008-07-11 | 2010-01-14 | Co.Me.S S.R.L. | Head for the treatment of stone and cerahic materials |
WO2010106389A1 (en) * | 2009-03-18 | 2010-09-23 | Co.Me.S. S.R.L. | Head for the treatment of stone and ceramic materials |
CN102528658A (en) * | 2012-01-19 | 2012-07-04 | 佛山市科润达机械有限公司 | Sand frame device with rotation and revolution |
CN102528658B (en) * | 2012-01-19 | 2015-12-09 | 佛山市豪伟德机械有限公司 | A kind of sand rack device with rotation and revolution |
WO2019184195A1 (en) * | 2018-03-28 | 2019-10-03 | 广东科达洁能股份有限公司 | Eccentric translational polishing head and polisher comprising the polishing head |
CN108943022A (en) * | 2018-08-09 | 2018-12-07 | 张欢 | A kind of radially compliant compensation device |
Also Published As
Publication number | Publication date |
---|---|
DE69004411D1 (en) | 1993-12-09 |
IT9085504A1 (en) | 1991-07-19 |
ES2046665T3 (en) | 1994-02-01 |
ATE96717T1 (en) | 1993-11-15 |
IT9085504A0 (en) | 1990-01-18 |
IT1240859B (en) | 1993-12-17 |
EP0437831B1 (en) | 1993-11-03 |
DE69004411T2 (en) | 1994-06-01 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP0437831B1 (en) | Lapping head with floating grinders for rocky materials, particularly for granite slabs | |
US4914867A (en) | Apparatus for processing end face optical fiber connector | |
US4222203A (en) | Machining device and method | |
US4287688A (en) | Apparatus for grinding plane, annular surfaces, especially on faying rings in gate valves | |
US3702082A (en) | Balancing device for rotating members | |
US4604008A (en) | Metal working machine having polygon tool support bar | |
JP2000094306A (en) | Machining method for cylindrical body-outside diametric surface, and cylindrical body | |
JPS635222B2 (en) | ||
US6893372B2 (en) | Roller bearing, transmission using the same and differential gear | |
US2649669A (en) | Appliance for lapping flat annular surfaces or disks | |
GB1575251A (en) | Machine tools | |
JP2002086305A (en) | Device for centering and fastening workpiece furnished with cylindrical shaft part on spindle side | |
US1766839A (en) | Grinding machine | |
US2610451A (en) | Lapping machine | |
US1885188A (en) | Arbor for ring splitting machines | |
US2450742A (en) | Lapping or polishing | |
US2869411A (en) | Turning apparatus | |
SU1563942A1 (en) | Arrangement for abrasive working of flat surfaces | |
SU757308A1 (en) | Apparatus for finishing member flat surfaces | |
CN115319588B (en) | Spherical grinder | |
GB947142A (en) | Improvements in or relating to lapping machines | |
US2466123A (en) | Method of making spindle bearings | |
US3383806A (en) | Motion control device for grinding tool | |
RU2119859C1 (en) | Gear machining small balls | |
SU1731591A1 (en) | Working rotor |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE CH DE ES FR GR IT LI NL |
|
17P | Request for examination filed |
Effective date: 19920114 |
|
17Q | First examination report despatched |
Effective date: 19921221 |
|
GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): AT BE CH DE ES FR GR IT LI NL |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: AT Effective date: 19931103 Ref country code: CH Effective date: 19931103 Ref country code: LI Effective date: 19931103 |
|
REF | Corresponds to: |
Ref document number: 96717 Country of ref document: AT Date of ref document: 19931115 Kind code of ref document: T |
|
ITF | It: translation for a ep patent filed |
Owner name: STUDIO ING. E. BONINI S.R.L. |
|
REF | Corresponds to: |
Ref document number: 69004411 Country of ref document: DE Date of ref document: 19931209 |
|
REG | Reference to a national code |
Ref country code: ES Ref legal event code: FG2A Ref document number: 2046665 Country of ref document: ES Kind code of ref document: T3 |
|
ET | Fr: translation filed | ||
REG | Reference to a national code |
Ref country code: CH Ref legal event code: PL |
|
REG | Reference to a national code |
Ref country code: GR Ref legal event code: FG4A Free format text: 3010641 |
|
PLBE | No opposition filed within time limit |
Free format text: ORIGINAL CODE: 0009261 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT |
|
26N | No opposition filed | ||
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: BE Payment date: 19991203 Year of fee payment: 10 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: BE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20001231 |
|
BERE | Be: lapsed |
Owner name: BREMA S.R.L. Effective date: 20001231 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: NL Payment date: 20041205 Year of fee payment: 15 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: DE Payment date: 20051130 Year of fee payment: 16 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: NL Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20060701 |
|
NLV4 | Nl: lapsed or anulled due to non-payment of the annual fee |
Effective date: 20060701 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: DE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20070703 |
|
REG | Reference to a national code |
Ref country code: FR Ref legal event code: TP Ref country code: FR Ref legal event code: CJ Ref country code: FR Ref legal event code: CA Ref country code: FR Ref legal event code: CD |
|
REG | Reference to a national code |
Ref country code: ES Ref legal event code: PC2A |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: ES Payment date: 20081226 Year of fee payment: 19 |
|
REG | Reference to a national code |
Ref country code: FR Ref legal event code: RM |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: GR Payment date: 20081231 Year of fee payment: 19 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: FR Payment date: 20081217 Year of fee payment: 19 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: IT Payment date: 20091230 Year of fee payment: 20 |
|
REG | Reference to a national code |
Ref country code: FR Ref legal event code: ST Effective date: 20100831 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: FR Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20091231 |
|
REG | Reference to a national code |
Ref country code: ES Ref legal event code: FD2A Effective date: 20111116 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: ES Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20091225 |