BG112438A - Dyeing unit for the edges of leather details - Google Patents

Abstract

The unit finds application in the leather goods industry. It ensures the transfer of a greater amount of dye on the leather part with one application, which reduces the number of applications and, as a result, significantly reduces the time of the entire technological operation. The unit consists of a vertically arranged dyeing head (1) connected to a motor (2) by a clutch (3). The dyeing head (1) includes a dyeing shaft (4) and an eccentric pump (5), which have a common axis of rotation (6) and are interconnected via a canal-tube system (7) for supplying dye to the dyeing shaft (4). , providing a plate (12) for adjusting the thickness of the dyeing film on the dyeing shaft (4), located perpendicular to the axis of the shaft (4) and tangentially to its lateral surface. The eccentric pump (5) is constructed of an eccentric cylinder (17), closed at the top with the bottom of a dyeing tank (8), in which an opening (18) is formed to feed the eccentric pump (5) with dye, and then to the side wall of the eccentric cylinder (17) is provided a thumb mechanism (19) made by a sleeve (20) closed at one end, in which a spring (21) and a spring pin (22) are located. In one embodiment, the clutch (3) connecting the dyeing head (1) to the motor (2) is a magnetic clutch.

Description

THE AGGREGATE FOR PAINTING THE EDGES OF LEATHER DETAILS

Field of technology

The invention relates to an assembly for painting the edges of leather parts, which is used in the leather and haberdashery industry.

BACKGROUND OF THE INVENTION

One of the main technological operations in the leather and haberdashery industry is painting the edges of the details. In essence, this is the application of water-soluble paint, as the quality of the performed technological operation depends on the amount of layered paint on the edge of the painted part. The aim is to achieve not only the coloring of the edge, but also its smoothing due to the achievement of a thick layer of paint. This operation is repeated many times to ensure a sufficiently thick layer of paint. After applying the first layer, the applied paint is usually polished with low-abrasive polishing brushes. After each application of a coat of paint, wait for the paint to dry before applying the next coat. To speed up the drying process, temperature dryers (from 60 to 150 °) can be used. In order to achieve good quality, it is necessary to make between 3 and 5 separate applications of paint on a given part, and drying is applied after each painting.

A unit for applying paint to the edges of leather parts by means of a horizontally placed rotating shaft coated with paint is known. When the edge of the leather part is touched, part of the paint on the shaft is transferred to the edge of the part. The paint shaft is coated with paint with the help of an additional wheel with a trapezoidal cross-section / beveled at an angle of 45 degrees /, which is partially immersed in a bath of paint, the side wall touching the wall of the paint shaft. When rotating, the additional wheel is coated in the tub with paint, after which the paint thus applied is transferred to the paint shaft, and from there - to the edge of the leather part. (Catalog of the company "GALLI" S.P.A., 2015)

The main disadvantages of this known painting unit are: The diameter of the painting shaft is not less than 12 - 15 mm, which creates serious problems in two main directions:

1. The amount of paint transferred from the paint shaft to the leather part is inversely proportional to the diameter of the paint shaft at the same thickness of the paint film on it. If there are two paint shafts - one with a diameter of 30 mm and the other 7 mm, and a film of paint with a thickness of 1 mm is applied to both shafts, the amount of paint transferred from the paint shaft with a diameter of 7 mm to the part will be significantly larger. With this known painting unit, it is not possible to achieve a painting shaft size of less than 12 - 15 mm. This results in significantly less paint being transferred to the leather part, which increases the number of times paint is applied to the same part. In order to achieve the desired quality when using a painting shaft with a diameter of 30 mm, it is necessary to paint one part 3 to 6 times, and if the painting shaft has a diameter of 7 mm, the part is painted 2 or at most 3 times. This is due to the significantly lower retention force of the paint / adhesion / to the painting shaft due to the smaller area of the shaft itself at the same thickness of the paint film on the shaft.

2. From a technological point of view, with the larger shaft it is more difficult to paint parts with sharp inner corners due to the large radius and the impossibility to reach the inner zones of the sharp corner.

In addition to the above disadvantages, the known unit has a complex mechanical construction to drive the coating shaft and the feed wheel. There are also significant difficulties in washing the units from the paint due to the large size of the shafts and paint trays.

Technical essence of the invention

The objective of the invention is to provide a unit for painting the edges of leather parts, which ensures the transfer of a larger amount of paint on the leather part with one application, which reduces the number of applications and as a result - significantly reduces the time of the whole technological operation. Another object of the invention is to simplify the construction for driving the paint shaft.

According to the invention, the unit for painting the edges of leather parts consists of a vertically arranged painting head connected to a motor by a coupling. The paint head includes a paint shaft and an eccentric pump, which have a common axis of rotation and are interconnected by a channel-tube system for feeding paint from the eccentric pump to the paint shaft, and a plate is provided to adjust the thickness of the paint film on the paint shaft. , located perpendicular to the axis of the shaft and tangential to its lateral surface. The eccentric pump is made of an eccentric cylinder closed at the top with the bottom of a paint tank, in which an opening is formed for filling the eccentric pump with paint. A thumb mechanism is provided to the side wall of the eccentric cylinder, made of a sleeve closed at one end, in which a spring and a spring-loaded thumb are located.

A screw for adjusting the position of the plate is provided to the plate for adjusting the thickness of the paint film on the painting shaft.

The painting shaft of the unit has a diameter of 6 mm to 8 mm.

A technological plug is provided in the side wall of the eccentric cylinder, in which there is an opening to the entrance of the channel-pipe system for supplying paint to the painting shaft.

The lower part of the painting head is covered by a housing, in the lower part of which there is a built-in shaft, equipped with a radial bearing sleeve for bearing the painting shaft.

The connector connecting the paint head to the motor is a magnetic connector and is made up of paint shaft magnets arranged radially and built into a holder which is attached to the axis of the paint shaft and motor magnets also arranged radially and built into a second holder, attached to the motor axis, the two holders having an equal number of magnets arranged one above the other. Between the two holders there is a panel of non-magnetic material, on which the paint head is placed so that the two holders are located one above the other. The panel of non-magnetic material closes the top of the box, which houses the second holder with the magnets and the motor.

The motor for driving the paint shaft is a stepper motor or a DC motor equipped with a driver.

The unit is equipped with a control controller connected to the power supply and a motor control driver.

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

The advantages of the unit for painting the edges of leather parts according to the invention are the following: The diameter of the paint shaft is significantly smaller, which ensures the transfer of more paint on the leather part with one application, and hence reduce the number of the application of paint on the part, which leads to a significant reduction in the time of the entire technological operation. On the other hand, a shaft with a smaller diameter provides easier and better painting of details with sharp inner corners, as such a shaft reaches the inner areas of the sharp corner. The two main parts of the machine - the electrical part with the motor and the paint head, are completely separated, which ensures unobstructed washing of the paint head with each change of paint color, without disassembling the elements of the paint head. The magnetic coupling provides the possibility of sealing the electrical part of the unit, including the motor and the controller, which multiplies the reliability of the machine.

Explanation of the attached figures

Figure 1 is a schematic diagram of the painting unit according to the invention;

Figure 2a is a schematic view of a paint shaft showing the principle of forming a paint film on the paint shaft;

Figure 26 is a schematic view of a painting shaft showing the principle of transferring paint from the painting shaft onto the part to be painted;

Figure 3 is a longitudinal section of the painting unit;

FIG. 4 is a cross-sectional view taken along FIG. 3, which passes through the eccentric pump;

Figure 5a is a longitudinal section of the painting unit showing a schematic representation of the magnetic connector;

Figure 56 is a cross-sectional view of the magnetic connector passing through the plane of the magnets;

Figure 6 is a front view with a partial vertical section of the unit for painting the edges of leather parts;

Figure 7 is a front longitudinal sectional view of a second embodiment of a unit for painting the edges of leather parts according to the invention, in which the lower part of the paint head, the coupling and the motor are covered by a vertically arranged tube;

FIG. 8 is a perspective view of the unit shown in FIG. 7, at first glance. Figure 9 is a perspective view of the unit shown in fig. 7, on second side view.

Examples of the invention

In FIG. 1 shows a schematic diagram of the unit for painting the edges of leather parts, which consists of a vertically arranged painting head 1 connected to a stepper motor 2 by a magnetic coupling 3. According to FIG. 1, FIG. 3 and FIG. 4, the painting head 1 includes: a painting shaft 4 and an eccentric pump 5 located below it, which have a common axis of rotation 6 and are connected to each other by a channel-pipe system 7 for supplying paint from a tank 8 to the painting shaft 4. In FIG. 2a and FIG. 26 shows a scheme for applying paint from the paint shaft 4 on the edge of a leather part 10. To the paint shaft 4 are provided a channel 11 of the channel-pipe system 7 for supplying the paint shaft, a plate 12 for adjusting the thickness of the paint film on the painting shaft 4 with a screw 15 provided thereto for adjusting the position of the plate 12 and a channel for draining the excess paint 13 from the painting shaft 4. The channel 11 and the plate 12 are attached to a support plate 14.

In FIG. 3 and FIG. 4 shows the eccentric pump 5, which is composed of an eccentric cylinder 17 with an eccentrically located axis of rotation 6 common to the paint shaft 4 and the eccentric pump 5. The eccentric cylinder 17 is closed at the top with the bottom of a tank 8 in which an opening 18 is formed. for filling the eccentric pump 5 with paint. A finger mechanism 19 is provided to the side wall of the eccentric cylinder 17, made of a sleeve 20 closed at one end, in which a spring 21 and a spring pin 22 are located. In the side wall of the eccentric cylinder 17 a technological plug 23 is provided, in which has an opening 24 to the inlet of the channel-pipe system 7 for supplying paint to the paint shaft 4.

The lower part of the painting head 4 is covered by a housing 25, in the lower part of which a shaft 27 is mounted, provided with a radial bearing sleeve 26 for bearing the painting shaft 4.

The duct-pipe system 7 for discharging the paint from the eccentric pump 5 to the paint shaft 4 (Fig. 1 and Fig. 3) includes series-connected pipes 29, 30, 31 and a channel 11 ending with a nozzle for feeding paint to the paint shaft 4. (Fig. 1).

In FIG. 1, FIG. 5a and FIG. 56 shows the magnetic connector 3 connecting the painting head 1 to the stepper motor 2, which consists of four magnets 35 for the painting shaft, arranged radially and built into a holder 37 fixed to the axis of the painting shaft 4, and four magnets 36 for the stepper motor 2 arranged radially and built into a second holder 38 fixed to the motor axis. Between the two holdings 37 and 38 there is a panel of non-magnetic material 39 (Fig. 1). The painting head 1 is placed on the non-magnetic material so that the two held on magnets 37 and 38 - on the stepper motor 2 and on the painting shaft 1 are located one above the other. In other embodiments, the number of magnets in each of the holders may be different from four, with the two holders having an equal number of magnets arranged one above the other. The minimum number of magnets can be two in each holder, and the maximum number depends on the size of the magnetic connector (they can be 3, 4, 5, etc. in each holder). The non-magnetic material panel 39 closes a box 40 at the top, which houses the magnets 36, the motor 2, the driver 41 for controlling the stepper motor 2, the power supply 42 and the controller 43 for controlling the unit connected to the power supply 42 and the driver 41. for control of the stepper motor 2. The controller 43 is a single-board microprocessor system for controlling the operation of the whole unit. In other embodiments, the controller may be a microprocessor system of another known type.

In FIG. 6 shows the unit for painting the edges of leather parts when viewed from the front with a partial vertical section.

In FIG. 7, FIG. 8 and FIG. 9 shows a second embodiment of a unit for painting the edges of leather parts according to the invention. The elements of the paint head 1, the magnetic connector 3 and the motor 2 are the same as in figures 1-5 with the following differences: The lower part of the paint head 1, the connector 3 and the motor 2 are covered by a vertically located tube 44, which at its lower end is fixedly mounted in a base 45, in which the driver 41 and the controller 43 are located.

The principle of operation of the unit for painting the edges of leather parts is as follows:

The painting shaft 4 is driven by the stepper motor 2, controlled by the controller 43. Another type of electric motors with controllable speeds, such as direct current, etc., can be used to drive the painting shaft 4. The movement from the motor 2 to the paint shaft 4 is transmitted by the magnetic coupling 3 shown in fig. 1, FIG. 5a and FIG. 56. The magnets in the two holders 37 and 38 are oriented so as to attract each other (Fig. 5a). When rotating the stepper motor 2, it rotates the holder 38 with the four magnets 36 of the electric motor 2. As a result of the attraction between the magnets 35 and 36 of the two holders and the holder 38 of the paint shaft 4 it also rotates in the same direction and at the same speed. In this way, the movement from the stepper motor 2 to the paint shaft 4 is transmitted in a completely non-contact manner.

The distance between the two holders 37 and 38 is determined by the thickness of the panel of non-magnetic material 39, the thickness of the bottom of the paint tank 8 and the air gaps required for the free rotation of the two holders. This distance may not exceed 5 mm to ensure sufficient torque transmission. If the distance is greater, then the pulling force weakens and the torque transferred from one holder to the other drops sharply.

Principle of operation of the eccentric pump 5. When the painting shaft 4 is rotated around the axis of rotation 6, the eccentric cylinder 17 is rotated. Thanks to the eccentrically located axis of rotation, it begins to rotate in such a way that point "A" (fig. 4) from the side wall of the eccentric cylinder 17 it goes around the inner wall of the paint tank 8 in the direction indicated in fig. 4 with arrow. Paint enters the eccentric pump 5 through the loading opening 18. During its movement, the eccentric cylinder 17 closes the hole 18 and the incoming paint in the pump 5 is pushed out of the eccentrically moving cylinder 17 to the finger mechanism 19. The spring-loaded finger 22 of the finger mechanism 19 follows the contour of the eccentric cylinder 17, closing the volume and to pass behind him. This increases the pressure in the volume closed between point "A" of the eccentric cylinder 17 and the spring pin 22 of the finger mechanism 11. The created pressure pushes the paint through the inlet of the channel-pipe system 7 to the paint shaft 4. The described actions are repeated repeatedly.

In FIG. 2a and 26 show the principle according to which the required thickness of paint film is formed on the coating shaft 4. The fresh paint enters the channel 11 of the channel-pipe system 7. After draining from the channel the paint sticks to the paint shaft 4, which rotates in the direction shown in FIG. 2a and FIG. 26. The paint is drawn from the paint shaft 4 and by means of the adjusting plate 12 a film of paint is formed on it, the excess amount of paint is removed and through the drain channel of the excess paint 13 is led to the tank 8 of the unit. The thickness of the film on the paint shaft 4 is determined by the distance between the paint shaft 4 and the adjusting plate 12, this distance being adjusted by means of the adjusting screw 15. When winding the adjusting screw 15, it moves the adjusting plate 12 away from the paint shaft 4. on the paint shaft increases.

After the paint film of the required thickness has been formed on the paint shaft 4, the leather part 10 approaches the paint shaft 4, moving in the direction indicated by the arrow in FIG. 26. When the leather part 10 touches the paint film on the shaft due to the adhesion / adhesion force / the paint is transferred from the paint shaft 4 to the leather part 10. In order to transfer the paint from the paint shaft 4 on the work piece 10, adhesion is required of the paint to the part to be greater than the adhesion to the shaft. Since the adhesion force of the paint depends on the area to which it adheres, the smaller the area of the paint shaft 4 / respectively its diameter /, the smaller will be the adhesion force to it, and hence the ability of the shaft to hold the paint on itself.

From the above it can be seen that the smaller the diameter of the paint shaft, the easier it will be to transfer the paint on the part. The painting shaft of the unit according to the invention has a diameter of 6 mm to 8 mm (in the case of existing units the diameters are more than twice as large).

Claims (9)

PATENT CLAIMS The unit for painting the edges of leather parts, characterized in that it consists of a vertically arranged painting head (1) connected to the engine (2) by a connector (3), the painting head (1) comprising a painting shaft (4) and an eccentric pump (5), which have a common axis of rotation (6) and are connected to each other by a channel-pipe system (7) for supplying paint to the paint shaft (4), a plate (12) being provided. for adjusting the thickness of the paint film on the paint shaft (4), located perpendicular to the axis of the shaft (4) and tangential to its side surface, and the eccentric pump (5) is made of an eccentric cylinder (17) closed at the top with the bottom of the a paint tank (8) in which an opening (18) is formed for filling the eccentric pump (5) with paint, with a finger mechanism (19) provided to the side wall of the eccentric cylinder (17), made closed by one its end sleeve (20), in which is located a spring (21) and spring-loaded finger (22). Assembly according to Claim 1, characterized in that a screw (15) for adjusting the position of the plate (12) is provided to the plate (12) for adjusting the thickness of the paint film on the painting shaft (4). Assembly according to Claim 1, characterized in that the painting shaft (4) of the assembly has a diameter of 6 mm to 8 mm. Unit according to claim 1, characterized in that a process plug (23) is provided in the side wall of the eccentric cylinder (17), in which there is an opening (24) to the inlet of the channel-pipe system (7) for feeding paint to the paint shaft (4). Unit according to claim 1, characterized in that the lower part of the painting head (1) is covered by a housing (25), in the bottom part of which a shaft (27) is mounted, provided with a radial bearing sleeve (26) for bearing the paint shaft (4). Unit according to claim 1, characterized in that the coupling (3) connecting the painting head (1) to the motor (2) is a magnetic coupling and is made of magnets (35) for the painting shaft (4) arranged radially. and built into a holder (37), which is attached to the axis (6) of the paint shaft (4), and magnets (36) for the engine (2), also arranged radially and built into a second holder (38) attached to the axis of the the motor (2), the two holders having an equal number of magnets arranged one above the other, and between the two holders there is a panel of non-magnetic material (39) on which the painting head (1) is placed so that the two holders (37 and 38) ) are arranged one above the other and the panel of non-magnetic material (39) closes from above a box (40) in which the second holder (38) with the magnets (36) and the motor are placed. Unit according to claim 1, characterized in that the motor (2) for driving the paint shaft (4) is a stepper motor or a DC motor equipped with a driver (41). Unit according to claim 1, characterized in that it is provided with a control controller (43) connected to the power supply (42) and the driver (41) Unit according to claim 1, characterized in that the control controller (43) is a single-board microprocessor system.