DE19622993A1 - Rotary honing brushes prodn. method - Google Patents

Abstract

The emery cloth plates are cut from a coil of strip material and positioned around a central spindle to which adhesive beads are applied to form a rotary brush. The brush cylinder is formed around a central core (4) to which adhesive is applied in two circular, parallel beads. A coil (12) of the abrasive material (13) in strip form is fed into a cutter (42) and plates (5) formed and individually offered radially to the core in contact with the adhesive. The core is rotated under the control of an electronic control system and the process repeated until the brush is formed.

Description

This invention relates to a method for realizing rotating brushes.

In particular, this invention relates to such a ver drive to form rotating abrasive brushes, one Central hub and a variety of plate-shaped grinding includes elements that ver like a flag with the hub are bound, he in a substantially radial direction stretch and are contiguous.

To realize the abrasive brushes of the one just described Art is from the Italian registered on 23.02.1990 No. 219581 from the same applicant, one Variety of plate-shaped grinding elements made of tape to realize abrasive material rolls one after the other to assemble plate-shaped elements so that they have a form an ordered series of elements and then the named to distribute the plate-shaped elements around the hub, before being connected to it.

The distribution of the plate-shaped elements around the Hub is usually made by hand, with the hub assigned bare form templates can be used.

The type of implementation described, even if applied, has some disadvantages.

Above all, it has relatively long implementation times and the use of specialists.

In addition, the type of implementation described does not allow only not to achieve high production clocks, which is why can only be used for the production of small product series is, but the products themselves point beyond that not a constant level of quality mainly because that when positioning the plate-shaped elements all around the hub and before connecting the plate-shaped Elements with the hub relative displacements of one or multiple elements can occur in relation to others which of course a loss of symmetry and there  with the functionality of the shaped brushes brings.

Finally, the type described has a relatively high Ko most connected, in addition to the indispensable use by specialists and the use of the shaping tool mentioned Ion accrue from the fact that for each realized product Typ a special form template must be provided.

The purpose of this invention is to implement a method rotation brushes, which he possible in a simple and economical manner the above solve the problems mentioned.

According to this invention there is a method of realization in front of rotating abrasive brushes that have a central core and a wreath of plate-shaped elements that extend outwards extend from the central core, include, given where in the process is characterized in that it is the Pha comprises at least one abrasive material belt along one To advance the transport route to a reference body, which has an axis, a free end of which ten tape on a lateral outer surface of the Be to create tensile body, the free end mentioned with the be said to connect the outer surface firmly, the so-called tape across to cut that a called plate-shaped element forms and the mentioned reference body and the reference body by means of a fixed plate-shaped element around the axis to pivot a certain angle, said Phases to achieve a wreath of plate-shaped Elements can be repeated.

Another purpose of this invention is to provide a plant for Realization of rotating grinding brushes.

According to this invention, a system for realizing rotating grinding brushes, each one central core and a wreath of plate-shaped elements extending outward from the central core comprise, the system being characterized in that they have an axis-moving head, drive means to turn the movement head mentioned  said axis, releasable connection means for connection dung, in use, a reference body that has an axis has and is delimited by a lateral outer surface, with the said movement head in a coaxial position with the Axis of the movement head itself, feeding means for Transport of at least one abrasive material belt along a transport route to and from the head mentioned place, when in use, a free end piece of the named Tape on said side surface, connection with tel for firmly connecting said end piece with the be said side surface and arranged along the route Nete cutting means for cross cutting the said tape includes.

The invention will now be described with reference to the accompanying Drawings are described, which are not restrictive show the embodiment and in which

• - a Fig. 1 is a schematic view of a preferred embodiment of the plant according to this invention is
• -. A Fig. 2 is a plan view of a preferred execution form from a realizable with the system of Figure 1 th grinding brush,
• -. A Fig. 3 shows a detail of the brush of Figure 2 shows, in enlarged scale,
• -. A Fig. 4 and 5 in section, a group of the plant of Figure 1 in two different Funtionszuständen zei gene
• -. A Fig. 6 is a section according to section line VI-VI of Figure 4,
• - Fig. 7 is an axonometric view of another group of the system of Fig. 1 and
• - Fig. 8 shows a sectional phase of the brush of Fig. 2.

In Fig. 1, 1 is a system in its entirety for the realization of rotating grinding brushes 2 , each comprising a central hollow hub 3 with an axis 4 , which is capable of being connected to a rotary head of a work machine (not shown).

Each brush 2 also includes a variety of known, plate-shaped grinding elements 5 of emery wall art or alternatively of a spongy type, ie made of porous and elastically compressible in thickness re alized, which are firmly connected to the hub 3 and are substantially radiating from extend the hub 3 out to gene an annular grinding ring 6 gene, which is coaxial with the axis 4 .

The hub 3 comprises a cylindrical, tubular Kör by 7 , which has an axis coinciding with the axis 4 and two flanges which are fixed by two disc-shaped bodies 8 which are arranged on the opposite sides of the ring 6 and the tubular body 7 are. Each disk-shaped body 8 has in particular two circumferential ring ribs 9 ( Figs. 2 and 8), which point towards each other and sit in corresponding circular grooves 10 , which are formed in the opposite end faces of the crane 6 .

The system 1 comprises an unwinding station 11 , in the interior of which a roller 12 of grinding belt 13 of a known type and a known transport device 14 , preferably of the type with motorized rollers, is arranged, which is capable of moving the belt along a transport path P and to the forming station 15 of the brushes 2 to move forward gradually.

Inside the station 15 , a mold group 16 is mounted, which comprises a fixed base 17 , partially shown, and comprises a cylindrical rotary head 18 , which has a substantially vertical axis 19 and with the base 17 rotatable about the axis, 19 and axially fixed position is connected. The head 18 is rotated about the axis 19 by an adjusting device 20 in an angular form of the known type, which comprises an electric motor 21 and a mechanical gear 22 , preferably of the type with gears or alternatively with a chain.

The head 18 comprises a lower cylindrical section 23 and an upper cylindrical section 24 , which has a smaller diameter than that of section 23 and is seen with two outer, diametrically opposite axial grooves 25 ver, which extend from the free upper end of section 24 and extend over a length which is substantially equal to half the height of the section 24 itself. The part 24 also has a circular outer groove 26 which is formed adjacent to the section 23 and in which a hollow ring body 27 is made of elastomeric material.

The body 27 is part of a pneumatic Anschlussvorrich device 28 and defines an inner chamber with variable volume, which is connected to a compressed air source (not shown) via a pneumatic circuit 29 and known per se, which is also part of the device 28 . The circle 29 comprises a known distributor 30 and a line 31 which is partially formed through the section 23 and connects the distributor 30 with the chamber of the body 27 pers.

With the section 24 , the tubular Kör are connected by 7 , each of which is laterally delimited by an outer surface 32 and when in use with the rotary head 18 via the device 28 in a coaxial position with the axis 19 and seen axially and angularly connected.

Before the station 15 seen in the direction of travel of the belt 13 , a known, motor-driven transport and guide station 33 is preferably arranged, of the type with rollers for the belt 13 , which is capable of using a free end piece 34 of the belt 13 in a substantially to orientate radial direction A with respect to the head 18 and thus with respect to the body 7 and to always press the free end piece 34 against the body 7 when in use. In particular, the group 33 includes a first and a second group of mutually distant roles indicated by 35 and 36 , of which the roles of the group 36 are loose, while the roles of the group 35 are motor-driven.

In each case with reference to Fig. 1, a cutting station 37 is formed along the route P between the groups 35 and 36 , inside which a cutting device 38 is mounted, which comprises two scissors 39 , which on the opposite lateral edges of the route P. and of the band 13 are arranged and capable of realizing two opposite U-shaped incisions 44 on the respective lateral portions of the band 13 .

The device 38 is connected to a fixed support frame (not shown) via a known motorized guide and slide unit 40 which is capable of allowing the position of the device 38 with respect to the molding station 15 to be adjusted along the route P. In particular, the unit 40 comprises a guide 41 which is formed on the fixed frame (not shown) and extends parallel to the path P and a carriage 42 which is slidably connected to the guide 41 and carries the device 38 before.

The device 38 is controlled by an electronic unit 43 , not described in detail and known, which is connected to the transport device 14 and the group 35 and capable of activating the device 38 so that a pair of cuts 44 are made in each forward step of the belt 13 become.

Furthermore, a cutting station 45 is formed along the route P and after the roller group 35 seen in the direction of travel of the belt 13 , inside which the band 13 provided with the U-shaped incisions 44 is cut transversely by a known group of scissors 46 to one Realize a variety of plate-shaped elements 5 , each of which is provided with a corresponding pair of incisions 44 in a U-shape.

The scissors group 46 is tightly connected to a fixed support frame) via a known, motor-driven guide and slide unit 47 , which is structurally identical to the unit 40 and capable of adjusting the position of the group 46 with respect to the forming station 15 along to allow the route P.

Referring again to FIG. 1, the system 1 also includes a known feed device 48 connected to the electronic unit 43 , located near the molding station 15 , and a container 49 with a known liquid adhesive and a pair of feed nozzles 50 includes. The nozzles 50 are arranged one above the other in wesent union parallel direction to the axis 19 , have corresponding outlets 51 and are carried by a known motor-driven arm 52 . The arm 52 is able to position the nozzles 50 between a retracted position in which the nozzles 50 are distanced from the turret and when in use from the tubular body 7 and an approached working position in which the outlets 51 are adjacent to the head 18 and are arranged adjacent to the side surface 32 of the body 7 in order to apply corresponding strips of liquid adhesive to the side surface 32 and to form corresponding annular beads 53 .

Again with reference to Fig. 1 1 includes the system a first and second robot manipulator of known type, indicated with 54 and 55, near the Formsta tion 15 is arranged as well as both integrated on the electronic A are connected 43 and electronic of the A unit 43 can be controlled in order to feed the body 7 to the molding station 15 one after the other or to pull a semi-finished brush out of the molding station 15 and to convey it to the finishing station 56 .

In particular, the manipulators 53 and 54 accordingly, mutually identical gripping members 57 , which are able to make a forced connection with the bodies 7 and each contain two fingers 58 , which are next to each other and against each other under the pressure of a linear actuator 59 known Type between a closed position in which they can move into the interior of the body 7 and an open or gripping position in which they are apart and make a friction coupling with the inner surface of the body 7 .

With reference to Fig. 1, the gripping member 57 of the manipulator 54 is between a receiving position in which it can remove the bodies 7 individually from a storage magazine 60 and a delivery position in which it enters the interior of the forming station 15 and the removed body 7 slipped onto the section 24 of the head 18 , movable.

The gripping member 57 of the manipulator 55 , on the other hand, is between a corresponding removal position, in which the corresponding fingers 58 each spread inside a corresponding groove 25 of the head 18 and are capable of a positive connection with an internal surface of the body connected to the head 18 7 make and a Abladestel development movable, in which it enters the interior of the finishing station 56 .

If the gripping member 57 of the manipulator 55 is in the finishing station 56 , it is able to place the removed brush on a corresponding, previously coated with adhesive disc-shaped body 8 and the rib 9 of the disc-shaped body 8 in the incisions 44 of the various insert plate-shaped elements 5 .

The operation of the system 1 will now be described from an intermediate operating state in which the gripping member 57 of the manipulator 54 is arranged in the magazine 60 and the fin ger 58 of the gripping member 57 retracted inside a body 7 to be removed and with the inner surface of the body 7 are friction-coupled and the gripping member 57 of the manipulator 55 is retracted in the finishing station 56 and in which the feed nozzles 50 are in their retracted position and the belt 13 has a free end located inside the cutting station 45 .

From this state, the electronic unit 43 activates the manipulator 54 , which conveys the corresponding gripping member 57 and there with the removed body 7 into the forming station 15 , where it connects it to the section 24 of the head 18 before it returns to the magazine 60 .

At this point, compressed air is passed through the circle 29 into the interior of the body 27 , which, by deformation, exerts a clamping action of the body 7 on the head 18 in a coaxial position with the axis 19 and then the motor 21 is activated, the head 18 moves evenly around the axis 19 rotates. At the same time, the nozzles 50 are brought into their advanced working position, and through the nozzles 50 , adhesive is applied to the surface 32 and there forms the teeth 53 .

After the order has been placed, the nozzles 50 are brought into their retracted position, and then the cutting device 38 is first activated, which makes a pair of cuts 44 on the belt 13 and then the transport device 14 , which moves the belt 13 forward by one step, puts a free end of the band 13 on the surface 32 and thus immerses it in the caterpillars.

Now while the roller group 35 holds the belt 13 in a fixed position and presses it against the surface 32 , the scissors group 46 is activated, which cuts the belt 13 transversely and thus forms a first plate-shaped element 5 , which is provided with the corresponding incisions 44 is. After the cross section of the belt 13 , the motor 21 is switched to step mode and the plate-shaped element 5 held only by the adhesive on the surface 32 of the body 7 is pivoted by a certain angle and this is the following a subsequent forward movement of the belt 13 End of the band 13 at the inner end of the previously formed plate-shaped element 5 adjoins.

At this point, the cutting device 38 is activated again, and the phases described in the following are repeated in the same order until the last plate-shaped element 5 is formed and the ring 6 is thus completed.

Subsequent to the completion of the ring 6 , the gripping member 57 of the manipulator 55 is brought into the shaping station 15 and is frictionally coupled to the inner surface of the body 7 , after which the connecting device 28 is deactivated and the member 57 is raised axially so that the Separates body 7 from head 18 before the body 7 and the corresponding ring 6 are moved toward the finishing station 56 .

Once in the finishing station 56 , the body 7 and the respective shaped ring 6 are placed by the manipulator 55 on one of the disk-shaped bodies 8 , which was coated before, ie was provided with an adhesive layer, the rib 8 of the disk-shaped body 8 in the Incisions 44 of the plate-shaped elements 5 is inserted, then the gripping member 57 is released from the body 7 and the second disc-shaped body 8 , which was also previously coated, is connected to the body 7 and the collar 6 , the corresponding rib 8 in the corresponding incisions 44 is introduced.

At this point, the brush 2 is subjected to a polymerization treatment and then it is passed to the collecting magazine (not shown).

From the above statements it is evident that the system 1 described above all makes it possible to significantly reduce the shape times of each brush 2 in relation to the known implementation modalities, since it allows the production cycles to be high.

In addition, the special way in which brushes 2 are implemented enables products not only to be of high quality and functional performance, but also products that all have the same quality level. The wall-free and constant relative positioning between the elements 5 is guaranteed by the presence of both the reference body 7 , which is nothing but part of the hub 3 , and the adhesive, which is already in the form phase of each of the plate-shaped elements 5 with the tubular body 7 firmly connects.

In addition, thanks to the simplicity and full automation of the entire system 1, the use of specialists is not necessary, which is why the shaped brushes 2 have extremely low manufacturing costs in relation to the known implementation modalities, which also result from the fact that absolutely no molds are used be or other positioning and surrounding elements.

The fact further to provide an adjusting device for the posi tion of both the cutting device 38 and the shear group 45 with respect to the forming station 15 enables production changes to be made in extremely short times. It is thus possible to realize brushes whose plate-shaped elements 5 can have any size and incisions which are located at arbitrary locations on the plat-shaped elements 5 .

Based on the above, it goes without saying that changes and variants can be made to the system described 1 , which do not exceed the scope of this inven tion.

In particular, the head 18 could be implemented differently than described and could in particular comprise a forced connection device of the tubular body 7 to the head which is different from that described as an example. But not only that, the head could also be designed to hold a body that is different from the body 7 , e.g. B. a cylindrical solid body with a correspond to the connecting pin.

In addition, the cutting device 38 could be replaced by another device, e.g. B. in the manner of a grinder or a La serbrennschneiders to be replaced.

Finally, the glue could be on the surface immediately before the molding of each of the plate-shaped members or the Formed a group of plate-shaped elements will.

Next, after the ring 6 has been formed and before the connection of the disk-shaped body 8 to the ring 6 and to the body 7 , one or more Rau pen adhesive for the gluing with the disk-shaped bodies 8 can be placed on the ring 6 .

Finally, it is evident that two or more belts could be transported at the same time along the route P, which are adjacent to one another and do not need to be equal, and that the disk-shaped bodies 8 could be dropped.

Claims (21)

1. A method for realizing rotating abrasive brushes ( 2 ), each comprising a central core ( 3 ) and a ring ( 6 ) of plate-shaped elements which extend outwards from the core ( 3 ), the method being characterized that it comprises the phases of moving at least one abrasive material belt ( 13 ) along a transport path (P) to a reference body ( 7 ) which has an axis ( 4 ), a free end piece ( 34 ) of said belt ( 13 ) to one lateral outer surface ( 32 ) of said reference body ( 7 ), firmly connecting said free end piece ( 34 ) to said outer surface ( 32 ), cutting said band ( 13 ) transversely so that said plate-shaped element ( 5 ) and the said reference body ( 7 ) and the reference body ( 7 ) fixed plate-shaped element ( 5 ) about said axis ( 4 ) to pivot by a certain angle, said Pha s s are repeated until the said wreath ( 6 ) of plat-shaped elements. 2. The method according to claim 1, characterized in that said end piece ( 34 ) is oriented in a substantially radial direction (A) with respect to said reference body ( 7 ) before the end piece ( 34 ) with said Outer surface ( 32 ) is brought into contact. 3. The method according to claim 2, characterized in that the connection of the end piece ( 34 ) of said Ban des ( 13 ) with said reference body ( 7 ) is realized by at least on a part of the outer surface ( 32 ) a subset of adhesive is applied. 4. The method according to claim 3, characterized in that the application of the adhesive is realized before said end piece ( 32 ) of said tape ( 13 ) with the outer surface ( 32 ) of said reference body ( 7 ) is brought into contact . 5. The method according to claim 4, characterized in that said adhesive application is realized so that at least one substantially coaxial with said axis ( 4 ) annular bead ( 53 ) is formed before the band ( 13 ) to the reference body ( 7th ) moved forward and a first plate-shaped element ( 5 ) of the ring ( 6 ) is formed. 6. The method according to any one of the preceding claims, characterized in that the connection of the end piece ( 34 ) of said band ( 13 ) with the reference body ( 7 ) is realized by a direct pressing action on said band ( 13 ) Reference body ( 7 ) is exercised. 7. The method according to any one of the preceding claims, characterized in that on the band ( 13 ) a plurality of pairs of mutually opposite, the side incisions ( 44 ) is realized, where the cross-section is made in a manner by which said plate-shaped element ( 5 ) is provided with at least one pair of said U-shaped cuts ( 44 ). 8. The method of claim 7, which is characterized in that are connected to said plate-shaped elements (5) annular clamping body (8), said annular body (8) at least partially in the formed on said plate-shaped elements said notches (44 ) to sit. 9. The method according to any one of the preceding claims, characterized in that said belt ( 13 ) is gradually moved forward along said path (P). 10. Plant ( 1 ) for realizing rotating brushes brushes ( 2 ), which comprise a central core ( 3 ) and a ring ( 6 ) of plate-shaped elements ( 5 ) which extend outwards from the central core ( 3 ) , wherein the system ( 1 ) is characterized in that it has an axis ( 19 ) having a movement head ( 18 ), drive means ( 20 ) for rotating said movement head ( 18 ) about said axis ( 19 ), releasable connection means ( 28 ) for connection, in use, of a reference body ( 7 ) which has an axis ( 4 ) and is delimited by a lateral outer surface ( 32 ), with said movement head ( 18 ) in a coaxial position with the axis ( 19 ) of the movement head ( 18 ) itself, feed means ( 14 ) for transporting at least one abrasive material belt ( 13 ) along a transport path (P) to said head ( 18 ) and for putting on, when in use, a free end piece ( 34 ) of said belt ( 13 ) on d he said side surface ( 32 ), Verbindungsmit tel ( 35 , 48 , 53 ) for firmly connecting said end piece ( 34 ) to said side surface ( 32 ) and along the route (P) arranged cutting means ( 46 ) for cross cutting the Band ( 13 ) comprises. 11. Installation according to claim 10, characterized in that it further comprises guide means ( 33 ) which are arranged along the path (P) around the end piece ( 34 ) in a substantially radial direction (A) in relation to orient the reference body ( 7 ). 12. Plant according to claim 10 or 11, characterized in that said connecting means ( 35 , 48 , 53 ) comprise feed means ( 48 ) to apply an adhesive to said lateral surface ( 32 ) for connecting said end piece ( 34 ) with the side surface ( 32 ). 13. Plant according to claim 12, characterized in that the said feeding means ( 48 ) has at least one feeding device ( 50 ) for applying at least one ring-shaped bead ( 53 ) coaxial with the axis ( 19 ) of adhesive to said lateral surface ( 32 ) include. 14. Plant according to claim 12 or 13, which is characterized in that it also comprises pressing means ( 35 ) to exert a direct pressing action to said head ( 18 ) towards said belt ( 13 ). 15. Installation according to any one of claims 10-14, characterized in that it comprises cutting means ( 38 ) which are arranged along the route (P9) and on opposite lateral edges of the transport route (P) to the said Band ( 13 ) to realize a plurality of pairs of opposite A cuts ( 44 ). 16. Plant according to claim 15, characterized in that said cutting means ( 46 ) are arranged after the cutting means ( 38 ) seen in the running direction of said band ( 13 ). 17. Plant according to any one of claims 10-16, which is characterized in that said supply means ( 14 ) are step supply means. 18. Installation according to any one of claims 10-17, which is characterized in that said drive means ( 20 ) are stepper drive means. 19. Installation according to any one of claims 10-18, which is characterized in that it has first manipulator means ( 54 ) for connecting said reference body ( 7 ) to said head ( 18 ) and second manipulator means ( 55 ) for releasing the mentioned reference body ( 7 ) and the plate-shaped elements ( 5 ) fixed to it by the head ( 18 ) itself. 20. Process for the realization of rotating grinding brush as essentially with reference to the added illustrations described. 21. Plant for the realization of rotating grinding brushes as essentially with reference to the accompanying ten illustrations.