ITUD20090095A1 - PORTABLE SHARPENING MACHINE TO AFFILE WOOD TIPS - Google Patents

Description

`` PORTABLE SHARPENING MACHINE FOR SHARPENING WOODEN DRILLS ''

Application sector

The present invention relates to a portable sharpening machine particularly suitable for sharpening wood drills, equipped in a simplified way in order to be used even by personnel without specific training.

In fact, the machine is compact and not bulky so it can be easily transported and subsequently used in coordination with specific operating machines in the sector, used static on a workbench or mobile on an appropriate trolley.

It is equipped with suitable equipment able to simplify the work of the sharpener, in particular for the sharpening of wood bits with two cutting edges, both for blind holes and of the type for through holes. It also provides for the positioning of the tip to be sharpened in a special alignment equipment, which allows the fixing of a special shank ideal for the correct and subsequent handling of the same on the specific pre-positioned sharpening stations, without the operator having to be equipped of particular technical knowledge. The machine is equipped with various sharpening stations and is able to sharpen both the two horizontal cutting edges and the lateral edges of the points and / or the inclined surfaces of the pass-through points.

The state of the art

In the state of the art, various sharpening machines for wood drills are known, but they are essentially of the fixed type, ie not portable, and are usually made operative in certain departments. They are general and very complicated and therefore require specific and punctual training of the operating staff, which is not always readily available on the job market.

Said sharpening machines provide various types of grinding wheels in relation to the various types of sharpening to be carried out, and furthermore they are not moved but are in rotation, fixed in position, so with their wear it is necessary to correctly reposition the slides of the equipment that support the sharpening tools.

These difficulties have led the industries in the sector to develop machines that are ever easier to use and to reduce their specializations in order to consequently also reduce the skills of the operating personnel.

To meet the needs of companies operating in the field of machining with chip removal, in the metal and wood sector, which do not have a specific sharpening department, we tend to create small machines with low costs in order to facilitate the sharpening phases. of the various tools without having to request the intervention of companies and external operators for these tasks, much less creating a specific department for the purpose.

Purpose of the Invention

It was decided to overcome the drawbacks encountered in the production of sharpening machines in particular for drills in general and specifically for wood drills, by creating a simplified sharpening machine that is easy to use even for not very trained personnel, having the following main characteristics:

- be of a compact type, of low bulk and weight, so as to be easily transportable and usable on any fixed or mobile bench, mounted eg. on top of a trolley;

- be portable;

- be equipped with equipment for pre-positioning or correct alignment of the tool or tip (specifically), in order to simplify this phase and the subsequent phases for the operator. Equipment that allows the insertion of a special manipulation shank on the opposite end of the tip to be sharpened, in order to facilitate the subsequent insertion of the same tip correctly in the specific equipment prepared for the various stages of sharpening the cutting edges;

- be equipped with a rotating wheel-holder axis, which can be moved and adjusted longitudinally if necessary;

- be equipped with a profiled wheel or more wheels or shaped sectors of wheel fixed coaxially on the same rotation axis;

- be equipped with appropriate tip holder equipment with respective guides or seats for fixing them in relation to the type of tool to be sharpened;

- be equipped with fixed or mobile equipment, which can also be adjusted angularly with respect to the grinding wheel or wheels;

- be equipped with a device to revive the profile of the shaped wheel if worn.

Essence of the invention

The objects of the invention are achieved according to the characteristics of the main claim and / or any other claim reported in this patent text, by means of the realization of an automatic portable sharpening machine, in particular for sharpening wood drills, both for blind holes and for holes. passers-by, but which with appropriate modifications is also suitable for sharpening bits or tools for metal and / or other materials.

The machine comprises a closed body with at least two vertical surfaces, of which a main one where - in the central part - protrudes a profiled wheel-holder rotating axis with adjustable longitudinal movement, and provides the possibility of fixing two bit holder supports at different angles with respect to the aforementioned rotation axis, for sharpening blind hole drills; the secondary surface on which the correct tip alignment device is attached. The sharpening machine also has a short lower horizontal plane, on which there is the possibility of fixing a sliding guide orthogonal to the axis of the grinding wheel, for fixing a bit holder or other tool, in an angular way. with respect to the axis of rotation of the grinding wheel. This particular equipment is used for sharpening through-hole drills and / or reviving the grinding wheel by means of devices suitable for the purpose.

Obviously, the machine has a special protective and safety closing screen.

Turning now to the description of the fundamental elements of the portable sharpening machine, particular importance - to simplify its use - is the device for aligning the tips before the sharpening phase, equipping them with a special tang with a concentric check hole. This shank is positioned vertically on the secondary surface of the machine. The tip to be sharpened is inserted vertically into the appropriate upper hole of the alignment device, matching the two cutting edges of the tip against the lower gauge which is inside the device and clearly visible from the outside. In this way the tip is positioned correctly in an angular direction, until it reaches the exact match between the cutting edges and the basic shape.

At this point the operator only has to insert a jig element or tip holder ring on the shank of the tip for the subsequent phases, having two opposite radial holes at 180 °, parallel and coaxial to the axis of the tip itself, one of which is mates with a protruding eccentric pin on the top surface of the centering device. These reference holes on the bit holder nut are used to simplify the subsequent centering phases on the respective sharpening equipment of the bit cutting edges, as the same holes will couple with the protruding pins, eccentric with respect to the hole for inserting the tips, arranged on the specific equipment.

Said device for correct alignment of the tips also provides for the possibility of centering both right and left type tips, by simply moving the base strikers with a special button or lever located at the base of the device itself. Furthermore, as the diameters of the tips vary, it is possible to interchange the corresponding centering bushings on the insertion part of the alignment device.

The portable sharpening machine is equipped with special support equipment for sharpening tips suitable for blind holes and through holes. Since these two types of tips are different from each other, they will need to use different support equipment. Those for the tips of blind holes are two in number and are fixed to the main vertical surface of the machine with appropriate reference pins and clamping screws. They are two in number, since there are two different types of cuts. for the sharpening of the center and side skim. Since they are two-edged tips, the operator will have to insert the tip once making a hole in the tip holder jig coincide with the reference pin located on the front surface of the first equipment, and a second time with the tip rotated by 180 °, making it coincide the second hole of the jig holds the tip with said reference pin.

The second sharpening equipment will be used to sharpen the center and side skims and will be used similarly to the previous one. It is clear that the operator does not have to be a sharpening expert, as it is sufficient to use the jig on the shank of the tip to correctly prepare the tip on the sharpening equipment. In the same way, the tips with opposite, ie left-hand, cutting edges will be sharpened: in this case it is sufficient to rotate the reference guide of such equipment.

The portable sharpening machine according to the present invention is also capable of sharpening wood bits for both right and left through holes. For these drills another equipment is used, which is fixed on the guides orthogonal to the grinding wheel located on the base plane of the machine with the same procedure described above. The angle of inclination with respect to the grinding wheel is fixed in order to simplify the operator's intervention. One edge at a time is sharpened by inserting the tip with the alignment jig into the equipment and performing the first sharpening by sliding the slide and then the second sharpening after rotating it by 180 °, always matching the fixed reference pin of the € ™ equipment with the 180 ° holes of the tip holder mask. To sharpen left-hand through drill bits it will be sufficient to replace the drill holder.

According to another characteristic of the present invention, the portable sharpening machine provides for the use of an equipment that can be dismantled and reassembled on the horizontal guide of the surface to revive the grinding wheel when it is worn. This equipment will be equipped with a spring plunger that will allow the correct position to revive the grinding wheels, and the increase in the dressing pass will be managed by an adjustment slide by releasing a safety screw.

The objectives of the present invention are achieved by realizing a sharpening machine for wood drills, blind and / or through, compact and of little bulk, portable, usable on a fixed bench or on a mobile trolley, easy to use even for inexperienced personnel.

Drawings illustrations

An embodiment solution according to the present invention is represented by way of a preferential, however non-limiting example, in the eight attached drawing tables, where:

- Fig. 1 shows, in perspective view, the portable sharpening machine equipped with the two groups for sharpening the cutting edges for wood drills for blind holes, highlighting the device for aligning the tips;

- Fig. 2 shows, in perspective view, the same portable sharpening machine, however, equipped with the wooden drill holder unit for sharpening drills and through holes;

- Fig. 3 shows, in partial side view, a wood drill for blind holes; - Fig. 4 shows, in partial side view, a wood drill for through holes with cutting edges at the end;

Fig. 5 shows, in partial side view, a wood drill for passers-by with two inclined cutting edges;

Fig. 6 shows, in front view, the device for the pre-alignment of the points to be sharpened;

Fig. 7 shows, in side view, the same device of the previous figure highlighting the upper centering pin for the tip holder assembly, the tip support base and the lever for orienting the right and left tips;

Fig. 8 shows, in plan view, the same device of the two previous figures highlighting the centering pin for the drill holder, concentric with the insertion hole of the bit to be oriented and of the bit holder shank;

Fig. 9 shows, in partial section view from the front, the tip alignment device, highlighting the tip of the tip in the correct support seat and the tip holder inserted in the upper concentric pin; Fig. 10 shows, in an enlarged sectional perspective view, the contact area of the tip end with the base abutment;

Fig. 11 shows, in an enlarged perspective view, the same area of the previous figure, highlighting the cutting edges of a bit for blind holes in position against the base and the reference edge;

Fig. 12 shows, in side view, the portable sharpening machine equipped with the two sharpening units for blind perforated tips;

Fig. 13 shows, in front view, the same machine of the previous figure, highlighting the two sharpening units oriented differently with respect to the grinding wheel, each for sharpening different cutting edges; - Fig. 14 shows, in plan view, the same machine of the two previous ones, highlighting the two tips with their respective tangs on the respective tip holders;

- Fig. 15 shows, in an enlarged plan view, the sharpening area of the two points;

- Fig. 16 shows, in side view, the portable sharpening machine with the equipment for sharpening bits for through holes;

- Fig. 17 shows, in front view, the machine of the previous figure, highlighting the equipment on horizontal sliding guides on the base plane of the machine itself;

- Fig. 18 shows, in plan view, the sharpening machine of the two previous figures, highlighting the orientation of the tip with respect to the grinding wheel; - Fig. 19 shows, in an enlarged plan view, the sharpening area for a drill for through holes;

- Fig. 20 shows, in plan view, the portable sharpening machine equipped with a wheel dressing device, with adjustable movements;

- Fig. 21 shows, in an enlarged plan view, the contact area between the wheel dresser and the wheel itself.

As can be seen from the attached figures, the portable sharpening machine (1) for wood drills, in particular for blind holes (9) (9.1) and through holes (9.2), is represented with various equipment mounted and suitable for sharpening various cutting edges of the tips themselves. It is compact and can be easily transported manually by means of the two special side seats (2), and can be placed and operated on a normal fixed bench or mobile trolley. It is obviously shielded with suitable safety means for the operator according to the regulations in force.

The sharpener consists of a horizontal base surface on which it is possible to fix sliding guides (4) for appropriate equipment (8); from this plane rises the body of the machine developed vertically with two surfaces, one main and one secondary. The rotating wheel-holder shaft (3) (3.1) protrudes horizontally on the main one, in a central position and perpendicular to said surface.

The grinding wheel shaft is able to be moved longitudinally with appropriate adjustment. The fixing stations of the various equipment (6) and (7) are provided on the same vertical surface, plus any other accessories such as the wheel dresser (19). The tip alignment device (5) is mounted on the secondary surface, smaller, arranged next to the main one, which serves to simplify the work of the operator and facilitate the insertion of the tip of a tool holder on the shank ( 16) which will later be used to correctly position the tip in the various and subsequent sharpening phases in the various stations.

The bit alignment device (5) comprises a vertical structure, in which the wood drill bit (9) (9.1) (9.2) is inserted vertically from above to be positioned through the central hole (10) by matching the cutting edges of ends against the base shape (13) (14) and the lower lateral stop (15). This last stop can be modified with a special mechanical lever system or command button (11) depending on the type of tip with right or left cutting edges.

Furthermore, on the upper part of the device there is a vertical reference pin (12), concentric to the insertion hole (10). The tip holder (16) will be coupled to this pin and will be locked on the shank at the moment of the exact radial orientation of the cutting edges with respect to the lower reference stop (15). Said tip holder (16) is equipped with two coupling holes (17) for pin (12) arranged at 180 ° with respect to its central axis, since the cutting edges of the tip are two at 180 ° and the same number of holes (17) on the drill holder, while on the equipment there will be only one pin (12) which will be used individually for each reference hole, one at a time. In this way it is sufficient to insert the tip correctly twice on the single equipment to carry out a perfect sharpening by performing a correct angle of the tool rake angle.

The portable sharpening machine (1) is equipped with various equipment (6) and (7) and the corresponding grinding wheel (3) for sharpening blind hole drills (9) and (9.1), and equipment (8 ) with corresponding grinding wheel (3.1) for sharpening through hole drills (9.2), and finally with adjustable wheel dressing unit (19). All the equipment can be disassembled in order to be able to equip the machine each time for the specific processes of relevance. As already mentioned previously, each specific sharpening tool (6) (7) (8) is equipped with a hole for inserting the tip and the tip holder, and a centering pin (12) perpendicular to the surface of support of the tip holder (16): in this way the correct angular positions of the tip (9) (9.1) (9.2) with respect to the corresponding grinding wheel (3) (3.1) are reached only when the pin (12) is coupled with one to the turn of the two holes (17) at 180 ° of the drill holder. Therefore the operator will not have to radially orient the bit on the grinding wheel, but simply insert the bit holder into the prepared tool, making sure to couple the reference pin (12) with a reference hole (17) of the bit holder (16 ), alternately one at a time: in this way the two cutting edges of the tip are sharpened correctly.

A first equipment is made up of two single groups (6) and (7) positioned on the main vertical surface of the machine incident to the central grinding wheel (3). There are two tools since they perform different sharpening: one concerns the front cutting edge with a specific rake angle and the other performs the simultaneous sharpening of part of the center and of the lateral side of the wood drill for blind holes (9) (9.1 ). Therefore, for a perfect sharpening, first the two opposite cutting edges must be sharpened at 180 °, inserting the tip twice in the same equipment (6) making sure to turn the tool holder (16) by 180 °, then pass the same tool holder (16) with the tip on the other equipment (7) to perform two sharpenings again at 180 °.

A second equipment (8) is provided by the present invention for sharpening wood drills of the through-hole type (9.2). It is mounted on special horizontal guides (4) on the base plane of the machine. The grinding wheel (3.1) has a different shape than the previous one, since the surface of the tip to be sharpened is only external and inclined in a particular way. Also this tip has two cutting edges and has two external surfaces to be sharpened so only one tool (8) is sufficient to sharpen one edge at a time, always in the same way described above.

A third equipment (19) is foreseen for the maintenance of the machine in particular to revive the grinding wheel (3) and / or (3.1) if worn due to its use of sharpening. This equipment is fixed to the base plane of the machine at an appropriate angle with respect to the grinding wheel, and is equipped with an adjustment screw (20) to correctly operate with the wheel dressing tool (18).

Of course, the invention is not limited to the example of realization described above, starting from which other forms and other ways of realization can be envisaged, and the details of execution can in any case vary without leaving the essence of the invention as set forth and claimed below.

Claims (1)

R I V EN D I C AZ I O N I 1 <Î ›> Portable sharpening machine for sharpening wood drills, both for holes and through holes, not bulky and heavy, easily transportable and operational both on a work surface and resting on a special mobile trolley, which can it can also be used alongside other machine tools in the processing departments, being directly usable also in maintenance and tooling operations of the same machine tools, characterized by the fact that it is equipped with one or more of the following characteristics, variously combined with each other: a) the portable sharpener is composed of a base structure, equipped with two opposite lateral gripping seats (2) to facilitate transport. It also provides a short horizontal surface on which slide guides (4) and / or other mobile (8) or fixed (19) equipment can be fixed, easily removable and reassembled supplied with the machine itself and usable as needed. It is equipped with at least one main flat vertical surface on which protrudes, in the central part, a grinding wheel shaft (3) (3.1) with direction orthogonal to the surface itself and movable with adjustment longitudinally to its axis, with some pins next to it. reference points and / or attachment points for other equipment. Finally, there is another vertical surface on which the vertical equipment (5) for the preliminary alignment of the tips is fixed; b) the sharpener is equipped with a first equipment (5) for the pre-alignment of the tips (9) (9.1) (9.2), both for right and left-hand tips, which is fixed vertically and has a hole (10) vertical non-passing, accessible from the upper surface for the insertion of the bits and the bits holder (16) on the relative shank. Also on the upper surface, in an eccentric position with respect to the hole (10), there is a reference pin (12), protruding vertically, which will couple to one of the holes (17) provided on the drill holder (16). Said tooling also provides a contact seat (13) for the tip of the tip within the perforated alignment base (14), with lateral reference (15) for the cutting edges of the tip. Finally, a mechanical orientation device is provided, which acts on the lateral reference (15) to position the right or left tip exactly, which can be operated from the outside (11); c) the sharpener is equipped with at least one bit holder (16) to facilitate the subsequent manipulation of the points to be sharpened. It is equipped, on the plane of contact with the equipment, with two through holes, parallel, symmetrical at 180 ° with respect to its axis, suitable for coupling with the respective reference pins (12) which are located on the contact surfaces of the equipment ( 5) (6) (7) and (8). Said means is inserted by the operator along the shank or rear part of the tip, locking it in position, in a phase subsequent to the matching of the cutting edges on the ends of the equipment (5). In this way the tip is locked in the right position on the tip holder, in the correct angular position in the radial direction with respect to the fixed reference point constituted by one of the two symmetrical holes (17); d) the sharpener is equipped with two other dismountable tools (6) (7) which are fixed on the vertical surface parallel to the axis of the grinding wheel (3). They are equipped with seats for the insertion of the tips to be sharpened equipped with tip holders (16) with direction incident on the surfaces of the grinding wheel. Each equipment is equipped with a reference pin (12) on the contact surface, which can be coupled to one of the two holes (17) of the drill holder. In this way, the angular orientation of the grinding wheel approach tip is guaranteed precisely for the previous pre-alignment. Each piece of equipment (6) (7) is designed for a specific sharpening of the cutting edges of wood drills for blind holes: for example, one (6) is used to sharpen, one at a time, the two front cutting edges and the other (7) to sharpen, one at a time, the center and the lateral sides of the tip; e) the sharpening machine is equipped with other equipment (8), which can be dismantled and reassembled on the horizontal plane, mounted on a parallel guide (4), movable and also angularly adjustable, incident to the grinding wheel (3.1). It also has on the surface in contact with the drill holder (16) a protruding pin (12) for reference and coupling with the holes (17) of said drill holder. This equipment is used to sharpen wood drill bits for through holes and sharpens one edge at a time, so the drill must be inserted twice into the equipment by rotating it 180 ° by coupling the pin (12) alternately with two holes (17) at 180 ° obtained on the drill holder (16); f) finally, the sharpener is equipped with specific maintenance equipment (19), removable and adjustable (20), which is fixed to the base surface of the machine (1) to revive the grinding wheel (3) (3.1), if worn out. 2 <Î ›> Portable sharpening machine according to the first claim, characterized in that the equipment (6) (7) (8) for the simplified sharpening of wood drills (9) (9.1) (9.2) are designed for respective sharpening of the cutting edges, specific for wood drills of various diameters and lengths. 3 <Î ›> Portable sharpening machine according to the first claim, characterized in that the drill holder (16), for the pre-alignment of the tips and for the subsequent positioning on the specific sharpening equipment, is suitable for locking in a long position the tang of wood drill bits (9) (9.1) (9.2), of various diameter and length. 4 <Î ›> Portable sharpening machine according to the first claim, characterized in that it is equipped with safety screens or protections for the prevention of accidents. 5A Portable sharpening machine according to the first one characterized in that the tip alignment device (5) is positioned on a secondary surface of the machine in order not to hinder the subsequent sharpening steps.