ES1067119U - Sharpening machine (Machine-translation by Google Translate, not legally binding) - Google Patents

Abstract

Sharpening machine, specially designed for knives and scissors, of the type that incorporate an electric motor for driving the abrasive elements, characterized in that said abrasive elements are materialized in flexible sheets, that is to say non-rigid, which rotate at low speed. Revolutions in order to adapt to the edges of the elements to be sharpened and to conveniently preserve said edges from possible annealing effects, having provided that said abrasive and flexible discs work in horizontal planes to facilitate the handling of the elements to be sharpened during the sharpening of the elements. Same. (Machine-translation by Google Translate, not legally binding)

Description

Sharpening machine

Object of the invention

The present invention relates to a machine sharpener, which has been specially designed for sharpening Knives and scissors

The object of the invention is to achieve a structurally simple, easy-to-use grinder that offers a optimum functionality derived from a low speed and of the use of flexible abrasive elements that adapt perfectly to the edges of the elements to sharpen.

Background of the invention

Currently for sharpening knives and scissors are used abrasive, stone discs, which work at a high number of revolutions, which causes a problem that It focuses primarily on the following aspects:

- The friction of the stone against the element a sharpening, causes it to overheat which results in problems of de-scaling of the steel, shortening the life of the product, with parallel production of abundant sparks and a notable environmental noise pollution.

- Some sharpening machines use water to  stone cooling, which causes problems of oxidation to the machine, as well as possible sources of pollution.

- Dirt produced during sharpening is scatter around the machine, also affecting the operator.

- In the case of knives and for sharpening the same on both sides, the use for a of said faces of the right hand and for the other side of the hand left, so that while sharpening one of these faces can be done with relative precision, (specifically that for which it is necessary to use the hand that usually uses the user), the results obtained with the other hand leave much to  to wish.

- Another problem of sharpening machines Conventional focuses on the difficulty of replacing abrasive discs, maneuver in which the contest of special tools.

Description of the invention

The sharpening machine that the invention proposes solves the problem fully satisfactorily previously exposed, in each and every one of the aspects commented.

To do this more specifically said machine It is constituted from a steel chassis on whose base upper two abrasive discs are set, which rotate at low revolutions, with different number one than another, flexible disks, that is not rigid, so that they adapt easily to the edges of the elements to sharpen.

These abrasive discs, for example sandpaper, they act on the upper platform of the chassis and remain mostly hidden just like that platform, by a flip top in which windows are established for access to abrasive discs of the tools to be sharpened.

The two abrasive discs are driven by a  Unique electric motor, mounted with the support of a bracket inside the steel chassis, with its axis in disposition vertical, motor whose output shaft directly attaches one of abrasive discs and a pulley, the latter for transmission of movement to the second abrasive disc, with the collaboration of a drive belt and a second pulley, shaft mounted on the chassis with bearing contest.

By an adequate difference of diameters in  the mentioned pulleys, it is achieved that while an abrasive disk rotates at the same speed as the motor output shaft, by example at 1,400 rpm, the other does it at about 900 rpm.

Description of the drawings

To complement the description that is being performing and in order to help a better understanding of the characteristics of the invention, according to a preferred example of practical realization of it, is accompanied as an integral part of said description, a set of drawings where with character Illustrative and not limiting, the following has been represented:

Figure 1.- Shows, according to a representation schematic in perspective antero-supero-lateral, one machine of sharpening carried out in accordance with the present invention.

Figure 2.- Shows an exploded perspective.  of the same machine.

Preferred Embodiment of the Invention

In view of the figures outlined and in special figure 2, can be seen as the machine that preconiza is constituted from a steel chassis in which two pieces participate, a lower piece (1), outlined in "U", so that it will constitute the lower base and the side and opposite walls of the chassis, and a second piece (2) which will in turn constitute the other three walls of the chassis and that has reinforcement profiles (3) at its free edges to Fixing the first.

This second piece (2) receives through its upper wall, which corresponds to the reference itself (2) and in collaboration with a support (4) to an electric motor (5) responsible for mobilizing two abrasive discs (6-6 '), preferably sandpaper.

More specifically the disk (6) is directly attached to the motor output shaft (7) (5), turning at same revolutions as the latter, for example at 1,400 rpm, further mounting on said shaft (7) a pulley (8) that with the collaboration of a drive belt (9) supplies the general movement of the motor body (5) to a second axis (10) at that a second pulley (11) of larger diameter is keyed than the first, this second axis (10) constituting the axis of rotation of the second abrasive disk (6 '), and so that the latter rotates at a substantially lower speed, preferably of the order of 900 rpm

Both axes (7 and 10) are parallel and vertical, and the shaft (10) is mounted with the collaboration of bearings (12), on a support (13) which, like the motor support (4), is fixed by screwing to the lower face of the upper base (2) of the steel frame or chassis.

Said frame has grilles (14) for thermal dissipation of heat generated in motor windings (5), and the power supply thereof is carried out through of a switch (15) conveniently mounted on the chassis and especially visible in figure 1.

The structure described is complemented by a flip cover (16), hinged to the upper rear edge (17) of the chassis, reduced height cover that mostly covers the base upper (2) of said chassis, and incorporating a pair of windows (18) through which they are directly accessible abrasive discs (6-6 '), so that the sharpening machine is used with the lid (16) closed to get that the latter acts as a protector for the user and as container that mostly prevents the exit of dirt to the machine outside during sharpening.

According to this structuring it is achieved for the machine of the invention that sharpening is carried out at low revolutions, producing little noise, not being precise the cooling of the abrasive discs for the same reason of its low number of revolutions, which in turn prevents the occurrence of clearing effects on knife steels and scissors.

On the other hand and when sharpening with discs or sheets of flexible sandpaper, these adapt perfectly to the edges of the elements to be sharpened without their occurrence irregularities in them.

Its handling is extremely simple, due to the horizontal position of the discs and the fact already commented that since they are flexible, they take the form of the edge, wearing it equally and avoiding imperfections and nicks in the sharp.

Dirt produced during sharpening is retained mostly by the protective cap, not leaving the exterior, that is the wear particles that occur in sharpening and they usually tend to jump up, they are retained mostly by the lid, reducing considerably the dirt that goes outside.

Sharpening can be done on both sides. of the knife with one hand, each user can use the one with the most skilled.

Finally the replacement of the disks abrasives once worn out are extremely fast and simple, since these are fixed to the respective axes with the Collaboration of a simple axial screw.

Claims (4)

1. Sharpening machine, especially designed for knives and scissors, of the type that incorporate an electric motor for actuation of the abrasive elements, characterized in that said abrasive elements are materialized in flexible sheets, that is to say non-rigid, that rotate at low speed. revolutions in order to adapt to the edges of the elements to be sharpened and to conveniently preserve said edges from possible disassembly effects, having said abrasive and flexible discs work in horizontal planes to facilitate the manipulation of the elements to be sharpened during the sharpening of the same. 2. Grinding machine, according to claim 1, characterized in that it incorporates two abrasive discs that rotate at a different number of revolutions, one of them coupled directly to the axis of a single electric motor, and the other coupled to a second axis coupled to the previous and also vertical , related thereto by pulleys and a transmission belt, so that while one of said abrasive discs rotates at the same speed as the electric motor itself, the other rotates at a significantly lower speed. 3. Sharpening machine, according to previous claims, characterized in that the motor is mounted, in collaboration with a support, on a steel chassis that configures a kind of prismatic housing that houses said motor inside, as well as a second support for the bearings on which the second shaft rotates. 4. Grinding machine, according to previous claims, characterized in that the upper base of the steel chassis, on which the two abrasive discs work, is assisted by a tilting lid, hinged to the chassis by its rear edge, said lid incorporating a pair of windows through which the respective abrasive discs are partially accessible, so that the sharpening operations are carried out with said cover in a closed situation, the elements to be sharpened to the abrasive discs through said windows.