The invention concerns a rotary tool assembly, in particular a rotary tool assembly including one or more pairs of rotating took (milling cutters) coaxial and with adjustable mutual distance.
Specifically, but not exclusively, the invention can be applied for the processing of wood and wood derivatives, plastics and composite materials, in mechanical processing, etc.
The prior art includes various examples of assemblies for rotary tools. Patent publication IT 201700050271 A1, in the name of the same applicant, shows an example of a rotary tool assembly.
The adjustable rotary tools (i.e. with the possibility of adjusting the mutual axial distance between the took) of the prior an can be improved, in particular as regards the precision in the adjustment of the tools, the rigidity and/or compactness of the assembly, as well as its versatility of use.
An object of the invention is to provide an adjustable assembly capable of in obviating one or more of the aforementioned limitations and drawbacks.
An object of the invention is to realize an assembly of an adjustable type rotary tool that is alternative to those of the prior art.
An advantage is to ensure a constant and uniform production quality over time, in particular by avoiding any possible variation or inhomogeneity caused by personal choices of the individual operators.
An advantage is to increase the production efficiency of the tools.
An advantage is to reduce the unproductive times due to the change of tools and/or to reduce, in general, the manual interventions, with a consequent increase in safety and guarantee of safety for the operators.
An advantage is to significantly reduce the general costs of production and/or to provide a standardized system that can be reused over time.
An advantage is to make available a support system for rotating tools, with adjustable reciprocal distance of the tools, winch allows their control and adjustment by remote programming.
Other advantages are to provide an adjustable rotary tool assembly with high fluidity and regularity of the adjustment movements, with a particularly rigid and compact structure, with high accuracy in adjustment even after a long period of use, with a reduced risk of blockages, seizures, radial and/or axial oscillations between moving pans, misalignments of mechanical parts during the adjustment movement.
An advantage is to give rise to an extremely versatile assembly, provided, in particular, with a portion that controls the adjustment and which in practice is not subject to wear, so that the assembly can receive various types of cutter bodies or combinations of cutter bodies, with the possibility of replacing only the portion subject to wear, while maintaining the portion that controls the adjustment.
These objects and advantages, and others besides, are achieved by an adjustable rotary tool according to one or more of the claims reported below.
The invention can be better understood and implemented with reference to the attached drawings which illustrate non-limiting examples of implementation, wherein:
With reference to the aforementioned figures, similar elements of different embodiment examples have been indicated for sake of conciseness with the same numbering.
The reference numeral 1 generally indicates a rotary tool assembly which may be used, in particular, in the processing of wood and wood derivatives, plastics and composite materials, in mechanical processing, etc.
The rotary tool assembly 1 includes a plurality of arrangements. The arrangements may be assembled together in various combinations so as to allow a plurality of different variants to be set up. Two of these possible variants are shown in the attached figures. A first variant, configured for the control of two pairs of tool bodies (milling cutter bodies), is shown as a whole in
This system has been adopted in order to better manage the replacement of worn tools, for any replacement of faulty elements and furthermore, to provide a suitable and performing solution with respect to the customer's needs.
A difference between the two variants of
The hub arrangement 5 may include, in particular, a hub portion 13 (for in example in the form of a hollow cylindrical body), a flange portion arranged at one end of the hub portion 13, and fixing members 14, for example of the screw type (in the specific example with four screws) configured for mutual fastening between the various component arrangements of the entire rotary tool assembly 1.
The rotary tool assembly 1 may be fixed to the motor 2, for example by means of screw fastening or other fastening members provided by the manufacturer of the machining machine.
It is noted that the rotary tool assembly consists of an independent unit whose various components are connected to each other in such a way as to form a separate assembly, so there is the possibility of using different hubs. The diameter and length of the part (cylindrical hub) that is inserted inside the assembly may be considered binding.
The guide arrangement 6 is configured to keep in guide the tool arrangements 7 and 8 and/or to support a protection ring 15. The guide arrangement 6 may include, in particular, the protection ring 15 configured to prevent the entry of foreign bodies into a space between the tool arrangements 7 and 8.
The guide arrangement 6 may include, in particular, a spacer device configured for the spacing between the various aforementioned arrangements and/or to act as guide device for the tool arrangements 7 and 8. The spacer device may include, in particular, one or more neutral spacers 16, for example spacers with (cylindrical) surfaces ground to a in glossy finish to minimize friction. The spacer device may include, in particular, one or more motor spacers 17, for example spacers with (cylindrical) surfaces ground with a glossy finish with functions similar to the neutral spacers. The motor spacers 17 may, in particular, be configured with a hollow execution to contain and protect the motor arrangements with encoders arranged in the drive arrangement 10. The guide arrangement 6 may include, in particular, a support 18 (rigidly connected to the protection ring 15) configured to support and lock the protection ring 15 in the center of the spacer device. Each spacer 16 and 17 may include, as in these examples, a central portion constrained to the support 18.
The lower tool arrangement 7 may include, in particular, a plurality of bushings, for example four bushings 19 and four bushings 20, which define a plurality of guide points (in this example four guide points).
The lower tool arrangement 7 may include, in particular, one or more (in this case two) adjustment screws 21 and one or more (in this case two) right threaded bushings 22 and one or more (in this case two) left threaded bushings 23. The adjustment screws 21, coupled to the relative threaded bushings, right 22 and left 23, allow to obtain opposite directions in the adjustment movement of the tool bodies. The adjusting screws 21 are placed on two opposite axes with respect to a central axis, in order to provide two further guiding members and/or in such a way as to perform the task of distributing the thrust force on two fulcrum areas, obtaining fluidity and greater precision in positioning.
As mentioned, the lower tool arrangement 7 includes a pair of tool bodies (for example a pair of milling cutter bodies, both right), in particular a smaller tool body 24 and a larger tool body 25, which are the working part of the assembly and therefore are subject to wear as a result of sharpening.
The tool bodies 24 and 25 are fixed to respective tool holders 26 and 27 through respective tool locking rings 28 and 29 and through respective sets of screws 30 and 31. The tool holders 26 and 27 are, joined together by an adjustment system including the adjustment screws 21 coupled to the threaded bushings 22 and 23.
The threaded bushings are fixed to the tool holders 26 and 27 by means of bush locks 33 with relative fixing screws 34. This locking system allows the threaded bushings 22 and 23 to be phased with the adjustment screws 21, so as to obtain precise centering and in order to make the threaded bushings with a material suitable for reducing friction with the adjustment screws.
There may be arranged on the tool holders 26 and 27, in particular, a first O-ring 35 (for example 140 mm) for sealing between the two tool bodies 24 and 25, and a second O-ring 36 (for example 160 mm) for sealing in the central area on the protection ring 15. There may be arranged on the tool holders 26 and 27, in particular, two rods 37 and 38 configured to signal (by means of a contact action) to the electronic control device (CPU arrangement 11) the maximum safe opening and closing and to phase the encoder of the motor arrangements of the drive arrangement 10, when necessary. The various positions, in particular the opening and closing points of operation, may be managed by the electronic control device. In particular, a respective fixing screw 39 may be coupled to each adjustment screw 21.
The upper tool arrangement 8 may include, in particular, tool bodies 24 and 25, winch are the working pan subject to wear as a result of sharpening. The tool bodies are fixed to tool holders 26 and 27 by means of tool locking rings 28 and 29 and screws 30 and 31. The two tool holders are joined together by an adjustment system with two adjustment screws 21 screwed to threaded bushings 22 and 23 right and left. The threaded bushings are fixed to the tool holders by means of bush locks 33 and fixing screws 34. This locking system allows the threaded bushings to be phased with the adjusting screws, positioning them in a centered way with precision and/or allows to realize the threaded bushings made of material suitable for reducing friction with the adjustment screws.
A first O-ring 35 (for example 140 mm) for sealing between the two tool bodies, and a second O-ring 36 (for example 160 mm) for the central seal on the protection ring 15 are positioned on the tool holders. On the tool holders there are two rods 37 and 38 which signal the maximum safety opening and closing to the electronic control device and in phase the encoder of the motor arrangements when necessary. The positioning, in particular the opening and closing points of operation, may be managed by the control device.
The second guide arrangement 9 may include, in particular, a guide flange 41 for fixing the hub and the various arrangements, and for housing a sealing O-ring 42 with the lower tool arrangement 7. The second guide arrangement 9 may include, in particular, the two screws 40 for fastening to the guide arrangement 6 by screwing them to the neutral spacers 16. The second guide arrangement 9 may include, in particular, two screws 43 for fastening to the drive arrangement 10.
The drive arrangement 10 may include, in particular, a container 44 for housing mechanical pans and for positioning them for protection from foreign bodies. The drive arrangement 10 may include, in particular, one or more (in this case two) transmission shafts 45 (lower) and one or more (in this case two) transmission shafts 46 (upper), configured to transmit the movement to the adjusting screws 21 of the tool arrangements 7 and 8. The drive arrangement 10 may include, in particular, screws 47 for fixing these transmission shafts.
It should be observed that the adjustment screws 21 are separated from the transmission shafts 45 and 46 in such a way as to facilitate the separation of the two groups of elements, in the phase of replacement of the tool bodies, without losing the coupling phase.
The drive arrangement 10 may include, in particular, a crown arrangement 48 configured to transmit movement to the drive shafts 45 and 46.
The drive arrangement 10 may include, in particular, two motor arrangements 49 and 50. The drive arrangement 10 may include, in particular, a plurality of pinions 51 and 52. The drive arrangement 10 may include, in particular, a plurality of pins 53 configured to act as shafts for the pinions 51 and 52 and/or to act as phase positioning device for the CPU arrangement 11. The drive arrangement 10 may include, in particular, a plurality of screws 47 for fixing the motor arrangements 49 and 50. The drive arrangement 10 may include, in particular, at least one O-ring 54 for sealing the tool arrangement.
The commands may be provided, for example, by means of the optical sensor S (see
The CPU arrangement 11 may include, in particular, a support flange 56 configured to support the CPU board 55. The support flange 56 may also be configured to act as a cover for the drive arrangement 10. The CPU arrangement 11 may include, in particular, one or more (for example two) micro limit switch arrangements 57, in particular arranged on the support flange 56. In this case a micro limit switch arrangement 57 is arranged for the safety limit of maximum mutual distance between the took (fully open), and a micro limit switch arrangement 57 for the safety limit of minimum mutual distance between the tools (fully closed).
The CPU arrangement 11 may include, in particular, one or more pins SK for in positioning the micro-limit switch arrangements. The CPU arrangement 11 may include, in particular, fixing members 59 (for example of the screw type) for fixing the CPU arrangement 11 to the drive arrangement 10. The CPU arrangement 11 may include, in particular, fixing members 60 (for example of the screw type) for fixing the CPU arrangement 11 and the drive arrangement 10 to the guide arrangement 6, in particular by means of screw couplings with the neutral spacers 16. The CPU arrangement assembly II may include, in particular, at least one O-ring 61 configured to seal with the upper tool arrangement 8.
The battery arrangement 12 may include, in particular, a case 62 for containing the batteries, in particular a case of toroidal shape, to allow a relatively large space to be left for the CPU arrangement 11 and/or to be relatively light. The battery arrangement 12 may include, in particular, a cover 63, in particular to protect the CPU board, and fixing screws 64 of the cover 63. The battery arrangement 12 may include, in particular, a plurality of batteries 65, various elements of electrical contact 66 of the batteries and various electrical connection cables 67. The battery arrangement 12 may include, in particular, a battery cover 68 for protecting the batteries and fastening screws 69 of the battery cover.
The crown arrangement 48 may include, in particular, a ring 70 for containing the spheres and supporting the crowns. The crown arrangement 48 may include, in particular, one or more crowns 71 (in this case two crowns) made of a material, for in example brave, suitable for reducing friction and at the same time sufficiently soft to run in and adapt to the spheres. The crown arrangement 48 may include, in particular, a plurality of spheres 72 (for example with a diameter of 2.5 mm). The crown arrangement 48 may include, in particular, one or more ring nuts 73 (in this case two ring nuts) each configured to stop a respective crown in position.
The assembly version of
The transmission shaft 45 may include, in particular, a tool shaft 79 and one or more (in the specific example two) radial bearings 80. The transmission shaft 45 may include, in particular, one or more (in the specific example two) keys 81 inserted in slots on the tool shaft 79. The transmission shaft 45 may include, in particular, at least one sealing O-ring 82 to protect the CPU board 55 against the leakage of oil or grease.
Each limit switch micro arrangement 57 may be arranged, as in this case, in the assembly portion (CPU arrangement 11) which contains the CPU board 55. Each limit switch micro arrangement 57 may be connected in contact, as in this case, to the rods 37 and 38 configured to operate the respective micro switches. This allows an adequate positioning of the micro switches and the possibility of an appropriate passage of the cables. The special configuration of the rods and of the micro-limit switch arrangements allows to maintain a desired balance in weight balancing.
The micro limit switch arrangement 57 may include, in particular, a micro body 83, for example made of insulating plastics. The micro limit switch arrangement 57 may include, in particular, one or more (in this case two) contact elements 84. The micro limit switch arrangement 57 may include, in particular, one or more rocker levers 85, in particular a right liking lever and a left tilting lever. The micro limit switch arrangement 57 may include, in particular, an elastic member 86 (for example one or more torsion springs) arranged to keep the levers in the closed circuit position.
The micro-limit switch arrangement may include, in particular, a lever fixing in member 87, for example with one or more fixing pins. The micro limit switch arrangement may include, in particular, one or more adjustment dowels 88 for adjusting the contact of the levers. The micro limit switch arrangement may include, in particular, a fixing member 89 (for example of the screw type) for fixing the micro switch. The micro-kart switch arrangement may include, in particular, a fixing member 90 for fixing the cables and locking the adjustment screws. The micro-limit switch arrangement may include, in particular, an insulating member 91 (for example of tubular shape) arranged to electrically isolate the mutual contact between the levers 85 and the respective rods 37 and 38.
The second guide arrangement 92 may include, in particular, at least one guide flange 93 for fixing the hub and the various arrangements of the assembly 1. The guide flange may be configured to house at least one O-ring 94 arranged for the sealing the lower tool arrangement 7. The second guide arrangement 92 may include, in particular, a fixing member 95 (for example one or more screws) for fixing to the neutral spacers 16. The second guide arrangement 92 may include, in particular, an additional fastening member 96 (for example one or more screws) for fastening to the drive arrangement (in this case with a single motor arrangement). The second guide arrangement 92 may include, in particular, a lower cover 97 arranged to protect and cover the lower part and/or to house an O-ring 99 arranged to seal the ring of the guide arrangement 6.
The drive arrangement 99 may include, in particular, one or more transmission shafts 46, each configured to transmit motion to the adjusting screws of the tool arrangement and, by means of the screws, to lix the tool arrangement. The adjustment screws are separated from the transmission shafts in order to facilitate the separation of the in two arrangements during the tool replacement phase, without losing the coupling phase.
The drive arrangement 99 may include, in particular, a crown arrangement 100 configured to transmit movement to the drive shafts 46. The drive arrangement 99 may include, in particular, a motor arrangement 50 and one or more pinions 52 and 53. The drive arrangement 99 may include, in particular, one err more pins 53 configured to act as shafts for the pinions and for the phasing of the CPU arrangement. The drive arrangement 99 may include, in particular, fixing members (for example a plurality of screws 47) for fixing the motor arrangement. The drive arrangement 99 may include, in particular, at least one O-ring 54 for sealing with the tool arrangement. The drive arrangement 99) may include, in particular, one or more bearing housing caps 101 to cover the empty seats of the lower shafts (not present). The drive arrangement 99 may include, in particular, a motor cap 102 to cover the empty seat of the second motor (not present) and with the counterweight function (to balance the missing parts with respect to the assembly of
The rotary tool assembly 1 may include, in particular as in the illustrated examples, a hub arrangement 5 with a hub portion 13 and with a flange portion disposed at a first end of the hub portion 13. The hub arrangement 5 may include, in particular, a tubular (cylindrical) body with an internal through cavity (cylindrical). The assembly 1 may include, in particular, a battery arrangement 12 with a cover 63 arranged at a second end of the hub portion 13 opposite the aforementioned first end. The battery arrangement 12 may include, in particular, a ring arrangement of one or more batteries 65 arranged around an axis of the hub portion 13. The battery arrangement 12 may include, in particular, an annular (toroidal) shaped case 62 containing the aforementioned ring arrangement of one or more batteries 65.
The assembly 1 may include, in particular, a guide arrangement 6 with a protection ring 15 arranged around the axis of the hub portion 13. The protection ring 15 may be arranged, in particular, between the flange portion and cover 63. The guide arrangement 6 may include, in particular, a support 18 arranged inside the protection ring 15. The guide arrangement 6 may include, in particular, two or more spacers 16 and 17, for example two pairs of spacers 16 and 17. Each spacer 16 and 17 may be extended, in particular, in the direction of the axis of the hub portion 13. Each spacer 16 and 17 may include, in particular, a fixed central portion (for example with interlocking coupling) on the support 18 and two end portions (for example cylindrical in shape) arranged on two opposite sides with respect to the support 18.
The assembly 1 may include, in particular, a second guide arrangement 9 with an annular guide flange 41 attached to the flange portion. The guide flange 41 may be, in particular, arranged around the axis of the hub portion 13 between the flange portion and the cover 63. The second guide arrangement 9 may include, in particular, fastening members 40 coupled to at least one of the aforementioned spacers so as to fix the guide flange 41 to the guide arrangement 6. The second guide arrangement 9 may include, in particular, fixing members 43 arranged to fix the guide flange 41 to the drive arrangements 10 or 99. The second guide arrangement 9 may include in particular, a sealing member 42 for sealing between the flange portion and the tool arrangement 7.
The assembly 1 may include, in particular, at least one tool arrangement 7 with two tool holders 26 and 27 each of annular shape arranged around the axis of the hub portion 13. Each tool holder 26 and 27 may be arranged, in particular, between the flange portion and the cover 63. The tool arrangement 7 may include, in particular, two tool bodies 24 and 25 coaxial to each other and each fixed to a respective tool holder 26 and 27. The tool arrangement 7 may include, in particular, two rods 37 and 38 extending in length in the axial direction. Each rod 37 and 38 may be, in particular, fixed to a respective tool holder 26 or 27. The tool arrangement 7 may include, in particular, an adjustment system for adjusting the mutual axial distance between the two tool bodies 24 and 25. The adjustment system may include, in particular, two adjustment screws 21 each with two threaded bushings 22 and 23 with opposite threading directions (one right and one left) and each fixed to a respective tool holder 26 or 27.
The assembly 1 may include, in particular, a drive arrangement 10 or 99 with an annular-shaped container 44 arranged around the axis of the hub portion 13 between the flange portion and the cover 63. The drive arrangement 10 or 99 may include, in particular, a motor arrangement 49 mounted on the container 44. The motor arrangement 49 may include, in particular, a gear motor 74 inserted at least partially in an internal cavity present in a tubular-shaped spacer 16.
The drive arrangement 10 or 99 may include, in particular, two transmission shafts 46 mounted on the container 44 and each configured to actuate rotations of a respective adjustment screw 21. The drive arrangement 10 may include, in particular, a crown arrangement 48 configured to transmit movement from the motor arrangement 49 to the drive shafts 46.
The crown arrangement 48 may include, in particular, a ring 70 and a toothed crown 71 rotatably coupled (by means of spheres 72) to the ring 70. The toothed crown 71 may be arranged, in particular, to transmit motion simultaneously to both drive shafts 46.
The assembly 1 may include, in particular, a CPU arrangement 11 with a support flange 56 arranged between the drive arrangement 10 or 99 and the cover 63. The CPU arrangement 11 may include, in particular, two micro limit switch arrangements 57 each configured to interact in contact with a respective rod 37 or 38 to signal the achievement of two safety limit configurations. The CPU arrangement 11 may include, in particular, a CPU 55 board which in turn may include, in particular, a receiving antenna.
The assembly 1 may include, in particular, a further tool arrangement 8 (see version of
The crown arrangement 48 (see version of
The assembly 1 may include, in particular, a protection ring 15 arranged at a circular interface line that separates the tool arrangement 7 (or lower tool arrangement) from the further tool arrangement 8 (or upper tool arrangement).
The tool arrangement 7 (as well as, similarly, the further tool arrangement 8) may include in particular, a first sealing ring 35 for sealing between the two tool bodies 24 and 25, and a second sealing ring 36 for the internal seal between the tool arrangement 7 and the protection ring 15.
Each transmission shaft 45 or 46 may be, in particular, connected to a respective adjustment screw 21 by means of a mechanical connection of the shaft-hub type comprising, in particular, at least two opposite keys 81.
The drive arrangement 10 or 99 may include, in particular, two or more pins 53 each configured to act as a shaft for a respective pinion 51 or 52 connected to the ring gear 71, and/or to act as a positioning device for the CPU arrangement 11.
The assembly 1 may include, in particular (see example of
The assembly 1 has reduced friction and play between the various parts that compose it, making the movements in the adjustment phases fluid and precise, despite the almost total absence of play. The assembly 1 has a structure with high resistance to wear and self-cleaning configuration in the event of infiltration of dust, ensuring the protection of the system and avoiding blocking or misalignment of the tools during movements, and maintaining the desired conditions of use over time.
The assembly 1 allows to control the movement (opening and closing) of two or more tool bodies (in particular milling cutter bodies) by applying three on two opposing and symmetrical axes, favoring stability and balancing.
The assembly 1 allows a certain versatility, thanks to its modularity, so that it can accommodate different cutter bodies and/or combinations of cutter bodies, it can replace them when exhausted, without changing the pan that controls the adjustment, as the part of adjustment is not subject to consumption.
The assembly 1 is in practice independent of the system for locking the assembly itself to the machine hawing the motor that controls the rotation, since the part of the tool set up for adjustment is separate and distinct tom the part that receives the rotation to perform the machining, making any type of attachment between tool and machine usable (expandable HYDRO bushings, simple hubs with or without keys, HSK, attachments, etc.), also making it possible to make adjustments even during machining, without necessarily stopping production.
Number | Date | Country | Kind |
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102020000024274 | Oct 2020 | IT | national |
Filing Document | Filing Date | Country | Kind |
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PCT/IB2021/059406 | 10/13/2021 | WO |