ES2875625T3 - Apparatus for staining edges of leather pieces - Google Patents

Abstract

An apparatus for dyeing edges of leather pieces, including a driven vertical dyeing shaft (4), which is connected with a motor (2) through a coupling (3), a dyeing tank (8), and of a plate (12) to control the thickness of the dyeing film on said dyeing tree (4), characterized in that the apparatus includes a dyeing head (1) that is arranged vertically, which includes the dyeing tree ( 4) mentioned and an eccentric pump (5), which has a common axis of rotation (6), and are connected to each other by a system of channels and tubes (7) that supplies the dye to the dyeing tree (4) mentioned, and the mentioned plate (12) that controls the thickness of the dye film on the mentioned dye tree (4) is arranged perpendicular to the axis of rotation (4) and tangential to the lateral surface of the dye tree ( 4); The mentioned eccentric pump (5) includes an eccentric cylinder (17) that is closed at the top by the bottom part of the dye tank (8), where an opening (18) is formed to supply the eccentric pump with dye ( 5) mentioned, where a pin mechanism (19) and a process plug (23) are mounted on the side wall of the mentioned eccentric cylinder (17), the mentioned pin mechanism (19) consists of a bushing that is closed in an end (20), where a spring (21) and a spring-loaded pin (22) are arranged; and the mentioned process plug (23) has an opening (24) that is connected with the inlet of the system of channels and tubes in order to supply dye to the dye tree (4), where the apparatus is provided with a controller (43).

Description

DESCRIPTION

Apparatus for staining edges of leather pieces

Technical field

The invention relates to an apparatus for staining the edges of leather pieces, which is used in the leather and haberdashery industry.

Background of the invention

One of the basic technological operations in the leather and haberdashery industry is to dye the edges of leather pieces by applying a water-soluble dye on the edges, while the quality of the technological operation carried out depends on the amount of dye that is deposited in the layers. The objective is to achieve, not only the coloring of the edge, but also to soften it by applying a thick layer of stain. Such a working step is carried out repeatedly in order to provide a sufficiently thick layer of dyeing. After applying the first coat, the applied stain is usually polished using low abrasive polishing brushes. When each layer of stain is applied, the stain is allowed to dry and then the next layer is applied. To speed up this drying process, dryers (from 60 to 150oC) can be used, and to achieve good quality, 3 to 5 separate applications of dyeing should be carried out in one piece, where drying would be carried out after each dyeing phase.

Patent document WO 2014/045200 A1 discloses a machine for dyeing the edge of leather pieces that is composed of a work surface for the leather to be dyed and a tool head, which can be moved along of the work surface with a numerical control spindle system. The head has a tool to stain the edges of the leather placed on the work surface. The machine also includes a vision system that images the leather to be dyed and placed on the work surface, and a computer that receives the images of the leather and processes the head trajectories to tint the edges of the leather. said leather. Said head includes: a variable volume chamber containing a dyeing liquid; an actuator that modifies the volume of said variable volume chamber; a dispenser with fluid connection to said variable volume chamber which is configured to apply the dyeing liquid to the edge of the leather to be dyed. Said chamber of variable volume is made up of a cylinder and a piston that slides in said cylinder.

This known device that ink edges of leather pieces does not allow to collect residual dye, which reduces its efficiency. In addition, it is necessary to disassemble the head to clean said device.

The patent document RO 131550 A1 discloses an apparatus for tinting narrow, convex and flat edges of belts and wide belts that are made of leather or other materials by applying a thick and convex dye film, both on a flat surface, and on a convex. The apparatus includes a dyeing device consisting of a dyeing cylinder that is provided with some circular channels with different depths and widths, which is responsible for supplying the dye or adhesive, a proximity sensor is mounted on top to detect the amount of dyeing or adhesive in the space above the dyeing cylinder and, in case the amount of dyeing is not enough, it takes a compressor that starts automatically and passes the dye from a bottle to the space above the dyeing cylinder; The apparatus also includes a steel plate that removes, if necessary, the excess dye from the surface of the dye cylinder, said plate is adjusted with some screws in order to make a convex, uniform and thick film on the edges of the a part without causing leakage on the side surfaces of the part that has been pre-tinted.

The size of the dyeing cylinder of the apparatus disclosed in the patent document RO 131550 A1 is relatively large, which reduces the ability of the sharp inner corners and curves of the leather pieces to be dyed with a high quality. Furthermore, the presence of channels in the dyeing cylinder prevents the dyeing cylinder from being washed.

An apparatus for applying dye to the edges of leather pieces is known which uses a rotating dye-coated shaft which is arranged horizontally. When the dye on the tree comes into contact with the piece of leather, a part of the dye is transferred to the edge of the piece. The coating of the dyeing tree with the dyeing is done with an additional wheel, which has a trapezoidal cross section (sharpened at an angle of 45 degrees) that is partially immersed in a bath with dyeing, where its side wall rests on the wall of the dye tree. During the rotation, the additional wheel is coated in the dye bath and the dye which is applied in this way is then transferred to the mentioned dye tree and from there to the edge of the piece of leather. (“GALLI” S.P.A. Catalog, 2015.)

The main disadvantages of such known apparatus are the following: the diameter of the dyeing tree is not less than 12-15 mm, which causes serious problems that go in two main directions:

1. The amount of dye that is transferred from the dye tree to the leather piece is inversely proportional to the diameter of the dye tree with the same thickness of the dye film. If there are two dye trees, in which one of them has a diameter of 30 mm, and the other has a diameter of 7 mm, and both have a dye film that is applied with a thickness of 1 mm, the amount of dye that is transferred from the dye tree that has a diameter of 7 mm onto the piece is significantly larger. It is not possible to achieve a diameter of the dyeing tree that is less than 12-15mm in such known dyeing apparatus. This considerably reduces the amount of dye that is transferred onto the leather piece, which increases the number of dye applications per piece. In order to achieve the quality required when using a dye tree that has a diameter of 30 mm, it is necessary to dye a piece 3 to 6 times, and when the diameter of the dye tree is 7mm, the piece requires 2 or maximum 3 applications of dye. This is due to the significantly lower force of holding the dye (adhesion) to the dye tree, as the area of the tree itself is smaller with the same thickness of the dye film on the tree.

2. From a process point of view, it is more difficult to stain parts with sharp interior angles using a larger shaft due to the larger radius and the inability to reach the interior areas of the sharp corner. In addition to the above disadvantages, said apparatus has a complex mechanical structure to drive the casing shaft and the drive wheel. There are also considerable difficulties when washing the dyeing apparatus, due to the large dimensions of the trees and the dye baths.

Patent document DE 295 18563 U1 discloses an apparatus for dyeing edges of leather pieces, which includes a driven vertical dyeing tree for dyeing edges of leather pieces, the dyeing tree is connected to a motor through a coupling . A screw conveyor which is housed in a dye cylinder is mounted on the axis of the vertical dye shaft, and said screw conveyor is immersed in an ink reservoir. A scraper is provided which is linked to the dye cylinder in order to remove excess ink from the dye cylinder.

Patent document US 1,774,502 A discloses an apparatus for staining the edges of leather pieces, which includes an ink application tool with an elongated hollow body having an inlet and an outlet port and a rough side surface for hold the ink and the dye edges of the leather pieces. A vertical driven dyeing shaft is located in the elongated hollow body of the ink application tool, and the dyeing shaft is connected to a motor through a coupling. The apparatus is provided with a pump which is a screw conveyor which is arranged inside the hollow and elongated body of the ink application tool and is mounted on the axis of the vertical dyeing tree, said screw conveyor pumps ink from a reservoir into the ink application tool and delivers it to its surface. A vertical plate (scraper) is mounted adjacent to the surface of the ink application tool in order to remove excess ink on the surface of the shaft.

The apparatuses described in patent documents DE 295 18563 U1 and US 1,774,502 A are provided with a screw conveyor for supplying dye from the reservoir to the dye tree. The amount of dyeing on the dyeing tree (the thickness of the dyeing layer on the tree) depends on the rotational speed of the screw conveyor, and this rotational speed determines the speed of the dyeing, where the speed of the dyeing it is inversely proportional to the thickness of the dye layer on the dye tree, which reduces the efficiency of the apparatus. Furthermore, these known apparatuses have a complex mechanical structure. There are considerable difficulties in washing the dyeing apparatus.

Disclosure of the invention

An object of the invention is to provide an apparatus for coloring edges of leather pieces, which ensures that a large amount of dye is transferred onto the leather piece per application, thus reducing the number of applications and, as a result, a significant reduction in the duration of the entire process.

Another objective of the invention is to simplify the dyeing tree that drives the structure.

An apparatus for dyeing edges of leather pieces, which includes a driven vertical dyeing shaft that is connected to a motor through a coupling, a pump that is mounted on the same axis of rotation of the dyeing shaft, a reservoir of dyeing and a plate for controlling the thickness of the dyeing film on said dyeing tree, wherein the apparatus includes a vertically arranged dyeing head including said dyeing tree and an eccentric pump, which is connected to said dyeing tree at through a system of channels and tubes for supplying dye to said dyeing tree, and said plate controlling the thickness of the dyeing film on said dyeing tree is arranged perpendicularly on the axis of rotation and tangentially on the lateral surface of the tree of tincture; said eccentric pump includes an eccentric cylinder which is closed at its upper part by the lower part of the dye tank, in which an opening is formed for supplying the dye to said eccentric pump; a pin mechanism and a process plug are mounted on the side wall of said eccentric cylinder, and said pin mechanism consists of a bushing that is closed at one end, said bushing houses a spring and a spring-loaded pin; and said process plug includes an opening connected to a inlet of the channel and tube system for supplying the dye to the dyeing tree, where the apparatus for dyeing edges of leather pieces is provided with a controller.

Advantageously, the dyeing tree of the apparatus has a diameter of 6 mm to 8 mm.

Preferably, said plate that controls the thickness of a dye film on the dye tree is provided with a screw for adjusting the position of the plate.

In a preferred embodiment, the lower part of the dyeing head is enclosed in a housing, where a shaft is incorporated in the lower part and said shaft is provided with a radial bearing to hold the dyeing shaft.

In advantageous embodiments, said coupling connecting the dyeing head with said motor is a magnetic coupling including magnets for the dyeing shaft that are radially arranged and incorporated in a support that is fixed to the shaft of the dyeing shaft, and the magnets for The motor are also arranged radially and incorporated within a second bracket that is fixed to the motor shaft, where both brackets have the same number of magnets arranged one above the other. There is a panel of a non-magnetic material between both supports where the dyeing head is positioned so that both supports are placed one on top of the other.

Preferably, the second mentioned support with the magnets, said motor provided with a motor controller, an electric power supply, and said controller are integrated in a box and said panel of non-magnetic material closes the upper part of the box.

In another preferred embodiment, the lower part of the dyeing head, the coupling and the motor are embedded in a vertically arranged tube, and said tube, at its lower end, is securely fixed to a base that integrates the motor controller. and the controller.

Preferably, the motor that drives said dyeing tree is a stepper motor or an alternating current motor.

Said controller is connected to a power supply and to said motor controller.

In a preferred embodiment of the invention, the controller is a single board microprocessor system.

The advantages of the apparatus for dyeing edges of leather pieces according to the invention are as follows: The diameter of the dye tree is significantly smaller, which ensures the transfer of a greater amount of dye onto the leather piece per application and As a result, the number of dye applications on the piece is reduced, which leads to a significant reduction in the duration of the entire process. On the other hand, a dyeing tree with a smaller diameter ensures easier and high-quality dyeing of parts having interior and acute angles, since such a tree type is capable of reaching the interior areas of acute angles. Both basic parts of the apparatus (the electrical part with the motor and the dyeing head) are completely separated to provide unobstructed washing of the dyeing head at every dyeing color change, without having to disassemble the parts of the dyeing head. tincture. The magnetic coupling allows the electrical part of the apparatus, including the motor and controller, to be sealed, thereby increasing the reliability of the apparatus many times over. Furthermore, the dyeing tree that drives the structure is simplified.

Brief description of the drawings

Figure 1 is a schematic diagram of an embodiment of a dyeing apparatus in accordance with the invention;

Figure 2a is a schematic representation of a dye tree illustrating the principle of formation of a dye film on the dye tree;

Figure 2b is a schematic representation of the dye tree illustrating the principle of dyeing that is transferred from the dye tree onto a part to be dyed;

Figure 3 is a longitudinal section of the dyeing apparatus according to the invention;

Figure 4 is a cross section along the line A-A of Figure 3, passing through the eccentric pump;

Figure 5a is a longitudinal section of the dyeing apparatus illustrating a schematic representation of the magnetic coupling;

Figure 5b is a cross section of the magnetic coupling passing through the plane of the magnet;

Figure 6 is a front view with a vertical and partial section of the apparatus for staining edges of leather pieces;

Figure 7 is a front view with a longitudinal and partial section of another possible embodiment of the apparatus for coloring edges of leather pieces according to the invention, where the lower part of the dyeing head, the magnetic coupling and the motor are inserted in a vertically arranged tube;

Figure 8 is a perspective side view of the apparatus shown in Figure 7 with a partial longitudinal section.

Modes for carrying out the invention

Referring to Figure 1, a schematic diagram of an apparatus for dyeing edges of leather pieces is shown, and said apparatus includes a vertically arranged dyeing head 1 having a dyeing shaft 4 which is connected to a stepper motor. 2 through a magnetic coupling 3. In accordance with Figure 1, Figure 3 and Figure 4, the dyeing head 1 includes: said dyeing shaft 4 and an underlying eccentric pump 5 having a common axis of rotation 6 and which are connected to each other by a system of channels and tubes 7 to supply dye to said dye tree 4 by means of said eccentric pump 5.

With reference to Figure 2a and Figure 2b, a diagram is presented for applying dye from dyeing tree 4 to the edge of a piece of leather 10. The dyeing tree 4 is provided with the following: a channel 11 of the dyeing system channels and tubes 7 for supplying dye to said dye tree 4; a plate 12 for adjusting the thickness of the dye film on the dye tree 4 and said plate 12 is arranged perpendicular to the axis of rotation 6 and tangentially to the lateral surface of the dye tree 4; said plate 12 is provided with a screw 15 for adjusting the position of the plate 12; and a channel 13 for removing excess dye from the surface of the dye tree 4. Said channel 11 and said plate 12 are fixed to the support plate 14.

The dye tree 4 of the dye head 1 has a diameter of 6 mm to 8 mm.

With reference to Figure 3 and Figure 4, the eccentric pump 5 is shown, which includes an eccentric cylinder 17 with an eccentrically arranged axis of rotation 6, common to the dyeing shaft 4 and to the eccentric pump 5. The part The upper part of the eccentric cylinder 17 is closed by the lower part of the dye tank 8 where an opening 18 is formed to supply dye to the eccentric pump 5. A pin mechanism 19 is mounted on the side wall of said eccentric cylinder 17, and said pin mechanism 19 consists of a bushing 20 that is closed at one end, and said bushing integrates a spring 21 and a spring pin 22. Also, a process plug 23 is mounted on the side wall of eccentric cylinder 17 which includes an opening 24 which is connected to the inlet of the channel and tube system 7 for supplying dye to the dye tree 4.

The lower part of the dyeing head 4 is embedded in a housing 25, where a shaft 27 is incorporated in its lower part which has a radial bearing 26 for dyeing the bearing and said housing 25 is provided with a foot 28.

The system of channels and tubes 7 for supplying dye from the dyeing tank 8 to said dyeing tree 4 includes tubes 29, 30, 31 connected consecutively and the channel 11 ends in a nozzle (not shown) (Figure 1 and Figure 3).

Referring to Figure 1, Figure 5a and Figure 5b, the magnetic coupling 3 is shown that connects the dyeing shaft 4 to the stepper motor 2. The magnetic coupling 3 consists of four pieces of magnets 35 for the drive shaft. dyeing that is radially arranged and incorporated in a holder 37, which is fixed to the axis of the dyeing shaft 6, and four pieces of magnets 36 for the stepper motor 2 that is radially arranged and incorporated in a second holder 38, which It is fixed to the motor shaft. There is a panel 39 of a non-magnetic material between both supports 37 and 38 (Figure 1). The dyeing head 1 is placed on the panel 39 of a non-magnetic material, so that the support of the magnet 37 of the dyeing tree 1 is arranged coaxially above the second support 38 of the stepper motor 2.

In other embodiments, the magnets on each of the brackets can be at least two pieces on each bracket, and the maximum number depends on the size of the magnetic coupling (there can be 3, 4, 5, etc. magnets on each bracket). Both brackets have the same number of magnets arranged one on top of the other.

With reference to Figure 6, the panel 39 of a non-magnetic material closes the upper part of a box 40, which accommodates the second mentioned support 38 with said magnets 36, said stepper motor 2, a motor controller 41 to control said stepper motor 2, an electrical power supply 42 and a controller 43 for controlling the apparatus, which is connected to a power supply 42 and the motor controller 41, as shown in Figure 1. Controller 43 is a single board microprocessor system that controls the operation of the entire apparatus. In other embodiments, said controller can be a microprocessor system of another known type.

Figure 7 and Figure 8 show another embodiment of the apparatus for dyeing edges of leather pieces according to the invention. The members of the dyeing head 1, the magnetic coupling 3 and the motor 2 are the same as those of Figures 1 to 5, except for the following: the bottom of the dyeing head 1, the Coupling 3 and motor 2 are enclosed in a vertically disposed tube 44 which, at its lower end, is securely attached to a base 45 which houses power supply 42, motor controller 41 and controller 43.

The principle of operation of the apparatus for dyeing the dyeing edges of leather pieces according to the invention is as follows:

The dyeing tree 4 is driven by the stepper motor 2 which is controlled by the controller 43. Other types of electric motors with controlled revolutions can also be used to drive the dyeing tree 4. The movement of the stepper motor 2 to the dye tree 4 is transmitted by magnetic coupling 3, as shown in Figure 1, Figure 5a and Figure 5b. The magnets on both brackets 37 and 38 are oriented to attract each other (Figure 5a). When rotating, the stepper motor 2 also rotates the support 38 with the four magnets 36 of the stepper motor 2. As a result of the attraction between the magnets 35 and 36 of both supports, the support 38 of the dyeing tree 4 also rotates in the same direction and with the same speed. In this way, the movement is transmitted from the stepper motor 2 to the dyeing shaft 4 in a completely contact-free manner.

The distance between both supports 37 and 38 is determined as a function of the thickness of the panel 39 of the non-magnetic material, the thickness of the bottom of the dye tank and the air spaces that are needed for the free rotation of both supports. This distance may not be more than 5mm to ensure sufficient torque is transmitted. If the distance is greater, the attractive force decreases and the torque transmitted between the two supports decreases dramatically.

Principle of operation of the eccentric pump 5. When the dyeing tree 4 rotates about the axis of rotation 6, the eccentric cylinder 17 also rotates. Because the axis of rotation 6 is arranged eccentrically, the eccentric cylinder 17 begins to rotate, so that point "A" (Figure 4) on the side wall of the eccentric cylinder 17 moves along the inner wall of the cylinder. dye tank 8 in the direction specified by the arrow in Figure 4. The dye enters the eccentric pump 5 through the supply opening 18. When moved, the eccentric cylinder 17 closes the supply opening 18 and the dye that has entered the pump 5 passes from the eccentrically moving cylinder 17 towards the pin mechanism 19. The spring-loaded pin 22 of the pin mechanism 19 follows the contour of the eccentric cylinder 17 that closes the volume delimited between the point A of the cylinder eccentric 17 and the point of contact of the spring pin 22 with the eccentric cylinder 17 at a precise moment, and does not allow the dye to pass behind the spring pin 22. Thus, the pressure within said The volume between point "A" of eccentric cylinder 17 and spring loaded pin 22 of pin mechanism 11 increases. The pressure that is generated pushes the dye through the inlet of the system of channels and tubes 7 to the dye tree 4. The actions that have been described are carried out repeatedly.

With reference to Figures 2a and 2b, the principle of formation of the dye film 9 is shown with the required thickness on the coated shaft 4. The fresh dye enters the channel 11 of the channel and tube system 7 and after flowing from the channel 11, the dye adheres to the dye tree 4 which rotates in the direction shown in Figure 2a and Figure 2b. The dye tree 4 drags the dye and, through the adjusting plate 12, forms a dye film 9 on the mentioned dye tree 4, while the excess dye is removed and, through the channel 13 to remove the excess dye is discharged into the dye tank 8. The film thickness of the dye tree 4 is determined as a function of the distance between the dye tree 4 and the plate 12, while this distance is adjusted with the adjusting screw 15. When adjusting screw 15 is screwed in, the distance between adjusting plate 12 and dyeing tree 4 increases, whereby the dyeing film 9 on dyeing tree 4 increases.

When the dye film 9 with the required thickness is formed on the dye tree 4, the piece of leather 10 approaches the dye tree 4, moving in the direction specified by the arrow in Figure 2b. When the leather piece 10 touches the dye film on the dye tree 4, as a result of adhesion (adhesion force), the dye is transferred from the dye tree 4 to the leather piece 10. Adhesion of the dye to piece 10 will be greater than the adhesion to dye tree 4, so that the dye can be transferred from dye tree 4 to leather piece 10. Since the adhesion force of the dye also depends on the area to which which adheres, since the smaller the area of the dye tree 4 (its diameter, respectively), the lower the strength of its adhesion and therefore the ability of the tree to hold the dye on its own.

As seen in the disclosure, the smaller the diameter of the dye tree, the easier the dye will transfer to the part. The dyeing tree 4 of the apparatus according to the invention has a diameter of 6 mm to 8 mm (the diameters of the existing apparatuses are twice as large).

Claims (10)

i. An apparatus for dyeing edges of leather pieces, including a driven vertical dyeing shaft (4), which is connected with a motor (2) through a coupling (3), a dye tank (8), and of a plate (12) to control the thickness of the dyeing film on said dyeing tree (4), characterized in that the apparatus includes a dyeing head (1) that is vertically arranged, which includes the dyeing tree ( 4) mentioned and an eccentric pump (5), which has a common axis of rotation (6), and are connected to each other by a system of channels and tubes (7) that supplies the dye to the dyeing tree (4) mentioned, and the mentioned plate (12) that controls the thickness of the dye film on the mentioned dye tree (4) is arranged perpendicular to the axis of rotation (4) and tangentially to the lateral surface of the dye tree ( 4); The aforementioned eccentric pump (5) includes an eccentric cylinder (17) that is closed at the top by the bottom part of the dye tank (8), where an opening (18) is formed to supply the eccentric pump with dye ( 5) mentioned, where a pin mechanism (19) and a process plug (23) are mounted on the side wall of the mentioned eccentric cylinder (17), the mentioned pin mechanism (19) consists of a bushing that is closed in an end (20), where a spring (21) and a spring-loaded pin (22) are arranged; and the mentioned process plug (23) has an opening (24) that is connected with the inlet of the system of channels and tubes in order to supply dye to the dye tree (4), where the apparatus is provided with a controller (43). The apparatus according to claim 1, characterized in that said dyeing tree (4) has a diameter of 6mm to 8mm. The apparatus according to claim number 2, characterized in that the aforementioned plate (12) controlling the thickness (15) of the dye film (9) on the dye tree (4) is provided with a screw (15) in order to adjust the position of the plate. The apparatus according to claim 1, characterized in that the lower part of the dyeing head (1) is inside a housing (25), in the lower part of which there is an integrated shaft (27), and said shaft (27 ) is provided with a bearing (26) that supports the dyeing tree (4). The apparatus according to claim 1, characterized in that the aforementioned coupling (3) connecting the dyeing head (1) to the motor (2) is a magnetic coupling consisting of magnets (35) for the dyeing tree (4) and that are arranged radially and integrated in a support (37) that is fixed to the axis of rotation (6) of the aforementioned dyeing tree (4), and of magnets (36) for the motor (2) that are also arranged radially and integrated within a second support (38) that is fixed to the motor shaft, where both supports (37, 38) have the same number of magnets that are arranged one above the other, and there is a panel of non-magnetic material (39) between the two supports (37, 38), and the mentioned dyeing head (1) is placed on said panel (39) in such a way that the two supports (37, 38) are positioned one above the other. The apparatus according to claim number 5, characterized in that said second support (38) with magnets (36), said motor (2) provided with a motor controller (41), an electrical power supply (42 ) and the controller (43) are located inside a box (40) and the aforementioned panel (39) of non-magnetic material closes the upper part of the box (40). The apparatus according to claims number 1 or number 6, characterized in that the lower part of the dyeing head (1), the coupling (3) and the motor (2) are embedded in a tube (44) that is arranged vertically, and this tube (44), at its lower end, is securely fixed to a base (45) where the motor controller (41) and the controller (43) are located. The apparatus according to claims number 6 and number 7, characterized in that the mentioned motor (2) that drives the dyeing tree (4) is a stepper motor or a direct current motor. The apparatus according to claims number 6 and number 7, characterized in that the mentioned controller (43) is connected to the power supply (42) and to the controller of the mentioned motor (41). The apparatus according to claim 9, characterized in that said controller (43) is a single board microprocessor system.