EP3791966B1 - Painting apparatus and method for painting pins - Google Patents

Description

The invention relates to a lacquering device and a method for lacquering pens, in particular pens that are wood-cased or have a sheath made of a wood substitute material, a so-called wood-plastic compound, for writing, painting and/or cosmetic purposes.

Usually, pencils that are wood-cased or have a sheath made of a wood substitute material, in particular pencils and/or colored pencils, but also cosmetic pencils, are lacquered in a piercing process, in which a pencil is pushed through a lacquer container filled with lacquer. Flowable, highly viscous paints are used here, which usually show thixotropic behavior.

The pins are pushed through the paint container in a lower region of the paint container in quick succession. Thick layers of paint on the surface of the pen are not possible in the present case, since after the pen has pierced through the paint container, the paint applied to the surface of the pen must dry within a few seconds so that the pins do not stick. For this purpose, the pins are usually applied to drying belts, so-called polishing belts, which are several meters long. However, the relatively thin paint films do not provide complete coverage of the wood structure, which means that the paint application and the subsequent drying on the drying belt have to be repeated several times. Colored paint is usually applied between three and seven times. Finally, a transparent clear coat is applied in one to three coats of paint.

U.S. 2003/118721 A1 discloses a method of applying glitter to cylindrical articles by forcing them through a vat of clear coat, squeegeeing the coating to a desired thickness, and then immediately passing the articles through a vat of glitter. The items then go through a vacuum tube that removes the excess glitter for reuse.

EP 0 834 351 A1 discloses a method in which paint or varnish is applied to the outside of elongate members, such as pencils, by passing the pencils through a container of paint or varnish, the pencils exiting the container through a washer containing it allowing the pencils to leave the container with a coating of paint or varnish on its exterior, and then passing the pencils through a light box capable of applying light to any point on the exterior of each pencil, revealing the paint or varnish contains a resin having the property that curing of the resin is initiated in response to application of the light.

The invention is therefore based on the object of specifying a device and a method for painting pens which at least largely overcomes the aforementioned disadvantages, in particular in order to improve the quality of the painted surface and bring about a reduction in the number of painting processes.

The first-mentioned object is achieved by a painting device having the features according to claim 1. Advantageous refinements and developments genes are specified in the respective dependent claims. The painting device according to the invention for painting pencils, in particular wood-cased pencils or pencils with a casing made of a wood substitute material for writing, painting and/or cosmetic purposes, comprises at least a first and a second paint container, the at least two paint containers each having an inlet and outlet opening , through which the pen enters and exits the paint container, the at least two paint containers being arranged one behind the other in order to apply paint to a surface of the pin at least twice in one painting process, the paint containers being filled with water-based paint or a paint based on organic solvents .

One advantage of the painting device according to the invention is that the at least two painting steps in just one painting process, i.e. without the pin lying on a drying belt between the painting steps, allow unevenness on the pin surface to be better covered even during a first painting process. As a result, on the one hand, an improvement in the painting quality and, in addition, a reduction in the number of painting processes compared to conventional painting devices is possible.

The wording “arranged one behind the other” is to be understood as meaning that the inlet and outlet openings of the paint containers lie along an axis in the piercing direction, so that a pin can be moved in a straight line through all the paint containers. For example, the painting device has a common platform on which the paint containers are arranged one behind the other.

The paint containers are filled with water-based paint or paint based on organic solvents. In the case of water-based paints, water is the main solvent; in the case of paints based on organic solvents, the solvents used are mainly ketones such as acetone, but also alcohols and/or esters. The paint containers of the painting device can each contain the same paint or different paints.

Furthermore, it can be provided that the painting device comprises at least one third paint container, the third paint container being arranged behind the first two paint containers. Furthermore, a fourth, fifth, sixth or further paint container can be provided, which are each arranged one behind the other. This further improves the result of a painting process.

At least one stripping element, which has a through-opening through which the pin is pushed, is preferably arranged at the outlet opening of the first and/or the second and/or the third and/or a further paint container. This wiping element serves in particular to wipe off excess paint so that only a thin, quick-drying paint film remains on the surface of the pen. Furthermore, the respective paint container is sealed off from the pen via the stripping element. In addition, surfaces can be smoothed and/or polished with it.

In order to evenly wipe off excess paint from the entire surface of the pen, the stripping element can, in the simplest case, have an annular through-opening. However, the at least one wiping element preferably has on its inner circumferential surface radially inwardly projecting wiping areas for at least partially wiping paint off the surface of the pin and recesses delimiting the wiping areas in the circumferential direction. The stripping areas extend parallel to the piercing direction and are flanked by the recesses or indentations which also run in the piercing direction. On the one hand, excess paint can only be removed from partial areas of the surface of the pen by means of the protruding wiping areas. On the other hand, such a geometric design of the stripping elements also makes it possible to completely strip the paint from the surface at defined points, which can result in striped pins, for example. According to a development, it is provided that a stripping element arranged on the outlet opening of the first paint container and/or a stripping element arranged on the outlet opening of the second paint container and/or a stripping element arranged on the outlet opening of the third paint container and/or a further stripping element on the outlet opening Paint container arranged stripping element differ from each other, in particular in such a way that the stripping areas of the stripping elements have a different extent and/or position in relation to the paint container in relation to the circumferential direction and/or in the radial direction and/or that the inner peripheral surfaces of the stripping areas have a different curvature exhibit. In particular, there is at least one stripping element with inwardly projecting stripping areas for stripping paint from a first surface area, in particular the surfaces of the pen, and at least one stripping element with inwardly projecting stripping areas for stripping paint from a second surface area, in particular from the edges of the pen , educated. For this purpose, the stripping areas have an extent that is complementary to the surfaces or edges of the pin. The geometry of the wiping areas can be used to set how much and where paint is to be wiped off the surface of the pen.

The at least one stripping element preferably contains an elastic material, for example rubber. In other words, the at least one stripping element consists at least partially of an elastic material. By compressing the stripping elements in the installed state in the painting device, it is also possible to set how much paint is to be stripped from the surface of the pen.

A development of the invention provides that after the first paint container and/or after the second paint container and/or after the third paint container and/or after a further paint container, a drying device, which is in particular ring-shaped, to dry the paint on the surface of the pen being able to dry evenly from all sides, for example an infrared radiator and/or hot air nozzles. This allows the initially applied paint film to dry slightly, so that a larger amount of paint can be applied in the immediately following painting step within the same painting process. This enables a higher number of pins to be punctured by the painting device or an increase in the amount of paint on the pin per paint container that is passed through.

The third paint container is preferably also filled with water-based paint or a paint based on organic solvents. The paint containers of the painting device can each contain the same paint or different paints. For example, there can be water-based paint in the first and second paint container and a paint based on organic solvents in the third paint container.

1. a) Hindurchschieben eines Stiftes durch einen ersten Lackbehälter der Lackiervorrichtung zur Applikation eines ersten Lackes,
2. b) Teilweises oder vollständiges Abstreifen des ersten Lackes an der Austrittsöffnung des ersten Lackbehälters,
3. c) Hindurchschieben des Stiftes durch einen zweiten, hinter dem ersten Lackbehälter angeordneten Lackbehälter der Lackiervorrichtung zur Applikation eines zweiten Lackes,
4. d) Teilweises oder vollständiges Abstreifen des zweiten Lackes an der Austrittsöffnung des zweiten Lackbehälters,
5. e) Trocknen des Stiftes auf einem Trocknungsband, insbesondere bei erhöhter Temperatur.

The second-mentioned object is achieved with a method having the features according to claim 9. In the method according to the invention for painting pins with a painting device according to the preceding description, a painting process comprises at least the following steps:

1. a) Pushing a pin through a first paint container of the painting device to apply a first paint,
2. b) Partial or complete stripping of the first paint at the outlet opening of the first paint container,
3. c) pushing the pin through a second paint container of the painting device, which is arranged behind the first paint container, for the application of a second paint,
4. d) Partial or complete stripping of the second paint at the outlet opening of the second paint container,
5. e) drying the pin on a drying belt, in particular at elevated temperature.

The first and second paint can be the same or different.

The method thus includes a painting process with at least a first painting step (steps a) and b)) and a second painting step (steps c) and d)).

According to a further development, the painting process comprises at least a third or a further painting step, in which the pen is pushed through a third paint container or a further paint container for the application of a third or further paint and the third or further paint is partially or completely at the outlet opening of the third or further Paint container is stripped.

The partial or complete stripping of paint is preferably carried out by a stripping element arranged at the outlet opening of the first paint container and/or at the outlet opening of the second paint container and/or at the outlet opening of the third paint container and/or at the outlet opening of a further paint container.

Preferably, the partial or complete stripping of paint at the outlet openings of the paint container is carried out by differently designed stripping elements, in particular by a stripping element for stripping off Paint from a first surface area of the pen and a stripping element for stripping paint from a second surface area of the pen. In particular, the first and second surface areas of the pin can correspond to the faces and edges of the pin. For this purpose, the wiping elements have wiping areas that protrude radially inward and extend in the circumferential direction, which differ in particular in relation to the circumferential direction and/or in the radial direction in extent and/or position in relation to the paint container and/or in the curvature of the inner circumferential surfaces, and these flanking recesses. A special geometric design of the stripping elements also makes it possible, for example, to produce striped pins. For this purpose, the wiping elements have, in particular, wiping areas which protrude further radially inward in order to completely wipe the paint off the surface of the pin at these points.

A further development of the method provides that after the partial or complete stripping of the paint at the outlet opening of the first paint container and/or at the outlet opening of the second paint container and/or at the outlet opening of the third paint container and/or at the outlet opening of a further paint container Intermediate drying takes place in order to slightly dry the initially applied paint film. As a result, a larger quantity of paint can be applied in the painting step that takes place immediately thereafter within the same painting process. The intermediate drying takes place, for example, with a drying device designed in the form of a ring, for example with an infrared radiator and/or hot-air nozzles.

Steps a) to e) of the method according to the invention can be repeated at least once.

FIG 1

eine schematische Darstellung einer perspektivischen Ansicht einer Lackiervorrichtung gemäß einer ersten Ausführungsform,

FIG 2

eine schematische Darstellung der Frontalansicht einer Lackiervorrichtung gemäß der ersten Ausführungsform gemäß FIG 1,

FIG 3

eine schematische Darstellung der Frontalansicht einer Lackiervorrichtung gemäß einer zweiten Ausführungsform,

FIG 4

eine schematische Darstellung der Frontalansicht einer Lackiervorrichtung gemäß einer dritten Ausführungsform,

FIG 5A

eine schematische Darstellung der Frontalansicht eines Abstreifelements gemäß einer ersten Ausführungsform,

FIG 5B

eine schematische Darstellung einer perspektivischen Ansicht des Abstreifelementes gemäß FIG 5A,

FIG 6A

eine schematische Darstellung der Frontalansicht eines Abstreifelements gemäß einer zweiten Ausführungsform,

FIG 6B

eine schematische Darstellung einer perspektivischen Ansicht des Abstreifelementes gemäß FIG 6A,

FIG 7

eine schematische Darstellung einer perspektivischen Ansicht eines Stiftes.

Einander entsprechende Teile und Komponenten sind auch über die verschiedenen Figuren und Ausführungsbeispiele hinweg jeweils mit den gleichen Bezugszeichen bezeichnet.The painting device according to the invention and the method according to the invention are explained in more detail below, also with regard to further features and advantages, on the basis of the description of exemplary embodiments and with reference to the accompanying schematic drawings. show it

FIG 1

a schematic representation of a perspective view of a painting device according to a first embodiment,

FIG 2

according to a schematic representation of the front view of a painting device according to the first embodiment FIG 1 ,

3

a schematic representation of the front view of a painting device according to a second embodiment,

FIG 4

a schematic representation of the front view of a painting device according to a third embodiment,

5A

a schematic representation of the front view of a stripping element according to a first embodiment,

5B

a schematic representation of a perspective view of the stripping element according to 5A ,

6A

a schematic representation of the front view of a stripping element according to a second embodiment,

6B

a schematic representation of a perspective view of the stripping element according to 6A ,

FIG 7

a schematic representation of a perspective view of a pen.

Parts and components that correspond to one another are also denoted by the same reference symbols across the various figures and exemplary embodiments.

FIG. 1 and FIG. 2 show a painting device 1a with a first paint container 2a and a second paint container 2b, which are arranged on a common platform 3. Both behind the first paint container 2a and behind the second paint container 2b, a stripping element 4a, 4b encompassing the outlet opening of the paint container 2a, 2b is arranged. The stripping elements 4a, 4b described in more detail below differ in the extension and curvature of their stripping areas 7a, 7b and are FIG. 5A and 5B as in FIG. 6A and 6B shown in more detail.

A pen 5 to be painted, which is in FIG. 7 is shown, is first pushed through the first paint container 2a in order to apply a first paint. Excess paint is wiped off the surface 8a of the pin 5 with the aid of the stripping element 4a arranged at the outlet opening of the first paint container 2a. The pin 5 is then pushed through the second paint container 2b, excess paint being stripped off the surface 8b of the pin 5 with the aid of the stripping element 4b arranged at the outlet opening of the second paint container 2b. The stripping elements 4a, 4b differ in the extension and curvature of their stripping areas 7a, 7b as in FIG FIG. 5A and 5B as in FIG. 6A and 6B shown in more detail. The pin 5 then dries on a drying belt, which is not explicitly shown. The procedure described is repeated at least once.

In FIG. 3 a second embodiment of a painting device 1b is shown, in which, in addition to the FIG. 1 and 2 illustrated first embodiment between the first paint container 2a and the second paint container 2b, a drying device 6 is arranged to the paint in the first container 2a applied paint to dry slightly before the pin 5 is pushed through the second paint container 2b. With the painting device 1b, intermediate drying is thus carried out as an additional step to the method described above by means of the drying device 6 between the two painting steps within a painting process. The drying device 6 is ring-shaped in the present case, so that the pin 5 can be pushed through it in order to evenly dry the paint film on the surface of the pin 5 . Furthermore, the drying device 6 can be arranged or fastened, for example, on the common platform 3, which is 3 is shown in dashed lines.

FIG. 4 shows a third embodiment of a painting device 1c, in which a third paint container 2c is also arranged behind the second paint container 2b. In addition, the illustrated embodiment includes two also ring-shaped drying devices 6, which are arranged between the first paint container 2a and the second paint container 2b and between the second paint container 2b and the third paint container 2c. With a painting device according to FIG. 4 After being pushed through the second paint container 2b, the pen 5 is also pushed through a third paint container 2c, with the applied paint also being partially or completely stripped off the surface 8a, 8b of the pen 5 by means of a stripping element 4c arranged at the outlet opening of the third paint container 2c will. After the pin 5 has been pushed through the first paint container 2a and after it has been pushed through the second paint container 2b, intermediate drying takes place by means of a drying device 6 . Also according to FIG 4 For example, the drying device 6 is arranged on the common platform 3, which is also shown in dashed lines.

In the FIG. 5A and 5B the wiping element 4a is shown, which has wiping areas 7a projecting inwards in a radial direction R and extending in the circumferential direction U on its inner peripheral surface, and wiping areas 7a and recesses 9a which delimit the wiping areas 7a from one another in the circumferential direction U, having. The stripping areas 7a are shaped in such a way or have a curvature that is complementary to the surface area 8a of the pin 5, so that the stripping of paint from the surface areas 8a of the in FIG. 7 shown pin 5, which correspond to the side surfaces of the pin 5, is possible.

the FIG. 6A and 6B show the stripping element 4b, which also has stripping regions 7b, which also project inward in a radial direction R and extend in the circumferential direction U, and recesses 9b flanking them on its inner circumferential surface. Here the stripping areas 7b for stripping the surface areas 8b of the in FIG. 7 shown pin 5 formed, which correspond to the edge surfaces of the pin 5 here, or have a surface area 8b of the pin 5 complementary curvature.

reference list

1a

painting device

1b

painting device

1c

painting device

2a

first paint container

2 B

second paint tank

2c

third paint tank

3

platform

4a

scraper element

4b

scraper element

4c

scraper element

5

Pen

6

drying device

7a

wiping area

7b

wiping area

8a

surface area

8b

surface area

9a

recess

9b

recess

R

radial direction

u

circumferential direction

Claims (14)

1. Painting apparatus (1a, 1b, 1c) for varnishing pencils (5), in particular wood-cased pencils or pencils (5) having a casing made from a wood substitute material for writing, drawing and/or cosmetic purposes, having at least a first (2a) and a second paint container (2b), the at least two paint containers (2a, 2b) each having an inlet and outlet opening, through which the pencil (5) enters and exits, characterized in that the at least two paint containers (2a, 2b) being arranged downstream of one another in order to apply paint at least twice to a surface (8a, 8b) of the pencil (5) in one painting operation, the paint containers (2a, 2b) being filled with water-based paint or a paint based on organic solvents.
2. Painting apparatus (1a, 1b, 1c) according to claim 1, characterised in that the painting apparatus comprises at least one third paint container (2c), the third paint container (2c) being arranged downstream of the first two paint containers (2a, 2b).
3. Painting apparatus (1a, 1b, 1c) according to one of the preceding claims, characterised in that at least one stripping element (4a, 4b, 4c) is arranged at the outlet opening of the first (2a) and/or the second (2b) and/or the third (2c) and/or a further paint container, which stripping element (4a, 4b, 4c) has a through opening, through which the pencil (5) is pushed.
4. Painting apparatus (1a, 1b, 1c) according to claim 3, characterised in that the at least one stripping element (4a, 4b, 4c) has, on its inner circumferential surface, radially inwardly projecting stripping regions (7a, 7b) for at least partially stripping paint from the surface (8a, 8b) of the pencil (5), and recesses (9a, 9b) delimiting the stripping regions (7a, 7b) from one another in the circumferential direction (U).
5. Painting apparatus (1a, 1b, 1c) according to one of claims 3 or 4, characterised in that a stripping element (4a) arranged at the outlet opening of the first paint container (2a) and/or a stripping element (4b) arranged at the outlet opening of the second paint container (2b) and/or a stripping element (4c) arranged at the outlet opening of the third paint container (2c) and/or a stripping element arranged at the outlet opening of the further paint container differ from one another, in particular in such a way that the stripping regions (7a, 7b) of the stripping elements (4a, 4b, 4c) have a different extent in relation to the circumferential direction (U) and/or in the radial direction (R) and/or that the inner circumferential surfaces of the stripping regions (7a, 7b) have a different curvature.
6. Painting apparatus (1a, 1b, 1c) according to any one of claims 3 to 5, characterised in that the at least one stripping element (4a, 4b, 4c) comprises an elastic material.
7. Painting apparatus (1a, 1b, 1c) according to one of the preceding claims, characterised in that a drying device (6), which is in particular of annular configuration, is arranged downstream of the first paint container (2a) and/or downstream of the second paint container (2b) and/or downstream of the third paint container (2c) and/or downstream of a further paint container.
8. Painting apparatus (1a, 1b, 1c) according to one of claims 2 to 7, characterised in that the third paint container (2c) is filled with water-based paint or a paint based on organic solvents.
9. Method for painting pencils (5) with a painting apparatus (1a, 1b, 1c) according to one of the preceding claims, characterized in that a paintingg process comprises at least the following steps:

   a) Pushing a pencil (5) through a first paint container (2a) for applying a first paint,

   b) Partial or complete stripping of the first paint at the outlet opening of the first paint container (2a),

   c) Pushing the pencil (5) through a second paint container (2b) arranged downstream of the first paint container (2a) for applying a second paint,

   d) Partial or complete stripping of the second paint at the outlet opening of the second paint container (2b),

   e) Drying the pencil (5) on a drying belt, especially at an elevated temperature.
10. Method according to claim 9, characterised in that the painting process comprises at least a third painting step, in which the pencil (5) is pushed through a third paint container (2c) or a further paint container for the application of a third or further paint and the third or further paint is stripped off partially or completely at the outlet opening of the third (2c) or further paint container.
11. Method according to claim 9 or 10, characterised in that the partial or complete stripping off of paint is effected by a stripping element (4a, 4b, 4c) arranged at the outlet opening of the first paint container (2a) and/or at the outlet opening of the second paint container (2b) and/or at the outlet opening of the third paint container (2c) and/or at the outlet opening of a further paint container.
12. Method according to one of the claims 9 to 11, characterized in that the partial or complete stripping off of paint at the outlet openings of the paint containers (2a, 2b, 2c) is effected by stripping elements (4a, 4b, 4c) of in each case different design, in particular by a stripping element (4a, 4b, 4c) for stripping paint from a first surface region (8a) of the pencil (5) and a stripping element (4a, 4b, 4c) for stripping paint from a second surface region (8b) of the pencil (5).
13. Method according to one of claims 9 to 12, characterised in that after the partial or complete stripping off of the paint at the outlet opening of the first paint container (2a) and/or at the outlet opening of the second paint container (2b) and/or at the outlet opening of the third paint container (2c) and/or at the outlet opening of a further paint container, an intermediate drying operation takes place.
14. Method according to any one of claims 9 to 13, characterised in that steps a) to e) are repeated at least once.

Images