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WO2000040413A1 - Extrinsing paintrest erasing machine - Google Patents

Extrinsing paintrest erasing machine Download PDF

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Publication number
WO2000040413A1
WO2000040413A1 PCT/FI2000/000002 FI0000002W WO0040413A1 WO 2000040413 A1 WO2000040413 A1 WO 2000040413A1 FI 0000002 W FI0000002 W FI 0000002W WO 0040413 A1 WO0040413 A1 WO 0040413A1
Authority
WO
WIPO (PCT)
Prior art keywords
product
scraper plate
machine
products
paint
Prior art date
Application number
PCT/FI2000/000002
Other languages
French (fr)
Inventor
Erkki Olavi Lehtosalo
Original Assignee
Erkki Olavi Lehtosalo
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=8553266&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=WO2000040413(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Erkki Olavi Lehtosalo filed Critical Erkki Olavi Lehtosalo
Publication of WO2000040413A1 publication Critical patent/WO2000040413A1/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B44—DECORATIVE ARTS
    • B44D—PAINTING OR ARTISTIC DRAWING, NOT OTHERWISE PROVIDED FOR; PRESERVING PAINTINGS; SURFACE TREATMENT TO OBTAIN SPECIAL ARTISTIC SURFACE EFFECTS OR FINISHES
    • B44D3/00—Accessories or implements for use in connection with painting or artistic drawing, not otherwise provided for; Methods or devices for colour determination, selection, or synthesis, e.g. use of colour tables
    • B44D3/16—Implements or apparatus for removing dry paint from surfaces, e.g. by scraping, by burning
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B1/00—Cleaning by methods involving the use of tools
    • B08B1/10—Cleaning by methods involving the use of tools characterised by the type of cleaning tool
    • B08B1/16—Rigid blades, e.g. scrapers; Flexible blades, e.g. wipers
    • B08B1/165—Scrapers

Definitions

  • the superfluous paint is removed by scraping, without causing any damage to the product.
  • the product is transported in an enclosed space through a scraper plate that follows the external dimensions of the product very accurately.
  • the scraper plate is made from an elastic material and the hole therein can be made smaller than the dimensions of the product. Support plates bigger than the dimensions of the product can be placed on both sides of the scraper plate. The waste coming off is blown away from one side of the machine and sucked away from the other.
  • the product comprises holes
  • the superfluous paint is removed therefrom by means of scraper plates provided at the ends of separate pins.
  • the hole-scraping pins are floating, which means that the pins are able to move sideways in order to eliminate deviations of size.
  • the product is fastened very carefully to the printing plate that is guided by means of guide pins or surfaces into the scraping part. Besides, the printing plate keeps the scraping space enclosed and dustproof during the scraping process.
  • An ejector is provided in the scraping space for receiving the product prior to the scraping and for returning the product after the scraping.
  • the ejector may comprise suction pads or mechanical holders to prevent the product from moving sideways during the scraping process.
  • An electric potential can be led to the machine in order to eliminate the dust accumulation problem caused by static electricity.
  • the machine can be provided with other machining station operations, e.g. with drilling, cutting etc. Naturally, one or more products can be taken into the machine at the same time.
  • the removal of superfluous paint is performed by bringing the products, which are fastened to the printing plate very carefully by means of suction pads or mechanically, into the scraping space and into contact with the ejectors.
  • air is started to blow from one side of the scraping space, while a suction is coupled to the other side.
  • a vacuum is coupled to the possible ejector suction pads.
  • the products are then moved toward the scraper plate and through the scraper plate. When the edge of a product reaches the edge of the scraper plate, the edge of the scraper plate yields and begins to slide along the product.
  • the scraper plate being pressed against the product, cuts the superfluous paint strips away.
  • the scraper plates disposed in the possible holes in the product remove the superfluous paint from the edges of the holes. The scraper plate is not allowed to cause any damage to the product or to the painted surface.
  • the ejector returns the product through the scraper plate and the product is thus scraped in the opposite direction.
  • the product is then transported to the following stage of operation on the printing plate.
  • the invention is characterised in that the machine comprises a scraper plate that is made from an elastic material and that comprises a hole that is smaller than the external dimensions of the product and the edges of which yield when a product is pressed through the hole.
  • the edge of the hole in the scraper plate is pressed against the product and it slides along the side of the product. If there are superfluous paint strips on the side of the product, the edge of the hole in the scraper plate cuts the paint strips away.
  • the removal of superfluous paint from the possible holes in the product is performed by scraper plates that are provided at the ends of floating pins and that have the same operating principle as the plate intended to scrape the outer surfaces of the product.
  • the invention is also characterised in that the scraping takes place in an enclosed space into which air is blown from one side and from which air and paint strips that have come off are sucked away from the other. Furthermore, the invention is characterised in that an ejector is provided in the scraping space for receiving the product before the scraper plate, for supporting and guiding the product during the scraping process and for returning the product through the scraper plate.
  • FIGURE 1 The Figure shows the machine seen from above, without a pressing plate 9 and a product 11.
  • the part 1 is a guide frame made from polyethylene plastic, for example. A twelve millimetres long part of the upper part of the hole in the frame slopes at fifteen degrees. The slope guides the printing plate 8 to the middle of the scraping space.
  • the lower surface of the guide frame 1 presses a scraper plate 2 or a support plate 15 intended for the scraper plate.
  • the minor sides of the guide frame 1 are provided with holes for blowing and suction.
  • the guide frame 1 is fastened to a body 13 by means of screws 16.
  • the part 2 is a 0,5 to 1 ,5 mm thick scraper plate made from raw rubber, for example.
  • the hole in the scraper plate is shaped in such a way that it is 0,3 to 0,5 mm smaller throughout than the external dimensions of product.
  • On both sides of the scraper plate are provided support plates 15 made from stainless steel, for example, the holes therein being 0,5 to 2 mm bigger than the external dimensions of the product.
  • the part 4 is an ejector that is square in cross-section.
  • a suction pad 5 is provided in the middle of the ejector. The suction pad pulls the product against the ejector and the ejector supports the product during the scraping process.
  • the part 6 is a compressed-air pipe connection piece through which a blast is directed above and under the scraper plate 2.
  • the part 7 is a suction pipe connection piece for sucking air and the paint waste out of the scraping space.
  • FIGURE 2 The Figure is a cross-sectional view of the machine, taken from a major side.
  • the guide frame 1 guides the printing plate 8 downward.
  • the printing plate is made from an eight millimetres thick aluminium sheet in such a way that it is, on each side, 0,1 mm smaller than the internal dimensions of the guide frame 1.
  • the printing plate comprises two plastic suction pads 10 holding two products 11 by means of a vacuum.
  • a seal 9 runs around the printing plate and seals the scraper space dustproof.
  • the upper surface of the body 13 comprises a cavity to which the scraper plate and the support plates fit closely.
  • the body comprises a cavity where the products 11 sink after they have passed the scraper plate.
  • At the bottom of the cavity are provided grooves 17 carrying the flanges of the pins 18 of the hole scrapers 3.
  • the grooves have to be approximately one millimetre wider than the flanges in order to enable the pins to move sideways.
  • the pins penetrate the support plate 19, the holes therein having one millimetre longer diameter than the pins.
  • a screw 20 retains the hole-scraping plate in place.
  • the hole-scraping plate can be made from the same material as the actual scraper plate 2 and it is 0,2 to 0,4 mm greater in diameter than the hole.
  • the body 13 comprises square holes for the ejectors 4 and the ejectors move in these holes. If the lower surface of the product 11 is not even, the upper surface of the product is given the shape of the lower surface of the product. Thus, the ejector body may not be round, or the possibility of the ejector rotating must be prevented in another way.
  • a space made by cutting is provided under the body 13 for the return springs 12 of the ejectors 4. In cases where the pieces are of the size shown in the Figure, the total spring force is about 80 N.
  • a bottom plate 14 is fixed under the body 13 for the purpose of receiving the force of the springs 12, and vacuum hoses run through it to the suction pads 5 of the ejectors.
  • the springs 12 of the ejectors 4 can also be replaced with compressed-air cylinders, in which case the force of the printing plate 8 can be reduced.
  • the ejectors 4, the products 11 and the printing plate 8 stay in place and the body 13, the scraper plate 2 and the guide frame (1 ) are moved back and forth so that the product moves through the scraper plate.

Landscapes

  • Feeding Of Articles By Means Other Than Belts Or Rollers (AREA)
  • Screen Printers (AREA)

Abstract

The method of removing superfluous paint described in this publicication concerns the removal of the superfluous paint remaining on the sides of the products when printing designs on plastic products inside a mould in a plastic-manufacturing machine. The method comprises a frame (1) that guides a printing plate (8) and products (11) attached thereto by means of suction pads (10) to a scraper plate (2). The products are pressed through a hole that is provided in the scraper plate and that is smaller than the product, the edge of the scraper plate being pressed against the product and cutting the superfluous paint strips away. A seal (9) seals the machining space dustproof. Ejectors (4) receive the products prior to the machining and eject the products after the machining. The ejectors may comprise suction pads (5) or other holders to prevent the product from moving aside during the machining process. If there should be holes in the products, floating scraping pins (3) are provided for them. In order to remove the superfluous paint coming off, air (6) is blown from one side of the machine and sucked (7) away from the opposite side. An electrical potential can be led to the body (13) of the machine to eliminate the problems that static electricity may cause.

Description

EXTRINSING PAINTREST ERASING MACHINE
Designs are printed on.plastic products by drawing a foil comprising the design through the mould. The paint is transferred to the plastic during the injection. Thus, the product already has a design printed thereon when it comes out of the mould. Because of the three-dimensional surfaces, there is paint outside the outer edges of the product. Some paint is therefore ripped off unevenly into thin strips to the sides of the product. The tidying up of the sides has proved to be a troublesome and laborious operation in the otherwise highly automated production. Attempts have been made to solve the problem by means of different kinds of brushes, by means of a laser, by blowing compressed air, by burning with a flame etc., but all the known methods have disadvantages.
Difficulties of the following kind have arisen: paint dust has been released into the indoor air, the product has not stayed in place during the treatment, the beam directed by the mirror from one direction has not reached all the necessary places on the sides of the product when using a laser, serious deviations of size have occurred due to the initial and thermal contraction of the plastic etc.
In the method according to the invention, the superfluous paint is removed by scraping, without causing any damage to the product. In the method, the product is transported in an enclosed space through a scraper plate that follows the external dimensions of the product very accurately. The scraper plate is made from an elastic material and the hole therein can be made smaller than the dimensions of the product. Support plates bigger than the dimensions of the product can be placed on both sides of the scraper plate. The waste coming off is blown away from one side of the machine and sucked away from the other. If the product comprises holes, the superfluous paint is removed therefrom by means of scraper plates provided at the ends of separate pins. The hole-scraping pins are floating, which means that the pins are able to move sideways in order to eliminate deviations of size. The product is fastened very carefully to the printing plate that is guided by means of guide pins or surfaces into the scraping part. Besides, the printing plate keeps the scraping space enclosed and dustproof during the scraping process. An ejector is provided in the scraping space for receiving the product prior to the scraping and for returning the product after the scraping. The ejector may comprise suction pads or mechanical holders to prevent the product from moving sideways during the scraping process. An electric potential can be led to the machine in order to eliminate the dust accumulation problem caused by static electricity. The machine can be provided with other machining station operations, e.g. with drilling, cutting etc. Naturally, one or more products can be taken into the machine at the same time. In the machine, the removal of superfluous paint is performed by bringing the products, which are fastened to the printing plate very carefully by means of suction pads or mechanically, into the scraping space and into contact with the ejectors. At this stage, air is started to blow from one side of the scraping space, while a suction is coupled to the other side. At the same time, a vacuum is coupled to the possible ejector suction pads. The products are then moved toward the scraper plate and through the scraper plate. When the edge of a product reaches the edge of the scraper plate, the edge of the scraper plate yields and begins to slide along the product. If there are superfluous paint strips on the outer sides of the product, the scraper plate, being pressed against the product, cuts the superfluous paint strips away. Correspondingly, the scraper plates disposed in the possible holes in the product remove the superfluous paint from the edges of the holes. The scraper plate is not allowed to cause any damage to the product or to the painted surface.
The ejector returns the product through the scraper plate and the product is thus scraped in the opposite direction. The product is then transported to the following stage of operation on the printing plate.
The invention is characterised in that the machine comprises a scraper plate that is made from an elastic material and that comprises a hole that is smaller than the external dimensions of the product and the edges of which yield when a product is pressed through the hole. The edge of the hole in the scraper plate is pressed against the product and it slides along the side of the product. If there are superfluous paint strips on the side of the product, the edge of the hole in the scraper plate cuts the paint strips away. The removal of superfluous paint from the possible holes in the product is performed by scraper plates that are provided at the ends of floating pins and that have the same operating principle as the plate intended to scrape the outer surfaces of the product. The invention is also characterised in that the scraping takes place in an enclosed space into which air is blown from one side and from which air and paint strips that have come off are sucked away from the other. Furthermore, the invention is characterised in that an ejector is provided in the scraping space for receiving the product before the scraper plate, for supporting and guiding the product during the scraping process and for returning the product through the scraper plate.
The invention will now be described in more detail with reference to the accompanying drawings.
FIGURE 1. The Figure shows the machine seen from above, without a pressing plate 9 and a product 11. The part 1 is a guide frame made from polyethylene plastic, for example. A twelve millimetres long part of the upper part of the hole in the frame slopes at fifteen degrees. The slope guides the printing plate 8 to the middle of the scraping space. The lower surface of the guide frame 1 presses a scraper plate 2 or a support plate 15 intended for the scraper plate. The minor sides of the guide frame 1 are provided with holes for blowing and suction. The guide frame 1 is fastened to a body 13 by means of screws 16. The part 2 is a 0,5 to 1 ,5 mm thick scraper plate made from raw rubber, for example. The hole in the scraper plate is shaped in such a way that it is 0,3 to 0,5 mm smaller throughout than the external dimensions of product. On both sides of the scraper plate are provided support plates 15 made from stainless steel, for example, the holes therein being 0,5 to 2 mm bigger than the external dimensions of the product.
The part 4 is an ejector that is square in cross-section. A suction pad 5 is provided in the middle of the ejector. The suction pad pulls the product against the ejector and the ejector supports the product during the scraping process.
The part 6 is a compressed-air pipe connection piece through which a blast is directed above and under the scraper plate 2. The part 7 is a suction pipe connection piece for sucking air and the paint waste out of the scraping space.
FIGURE 2. The Figure is a cross-sectional view of the machine, taken from a major side.
In the Figure, the guide frame 1 guides the printing plate 8 downward. The printing plate is made from an eight millimetres thick aluminium sheet in such a way that it is, on each side, 0,1 mm smaller than the internal dimensions of the guide frame 1. The printing plate comprises two plastic suction pads 10 holding two products 11 by means of a vacuum. A seal 9 runs around the printing plate and seals the scraper space dustproof.
The upper surface of the body 13 comprises a cavity to which the scraper plate and the support plates fit closely. The body comprises a cavity where the products 11 sink after they have passed the scraper plate. At the bottom of the cavity are provided grooves 17 carrying the flanges of the pins 18 of the hole scrapers 3. The grooves have to be approximately one millimetre wider than the flanges in order to enable the pins to move sideways. The pins penetrate the support plate 19, the holes therein having one millimetre longer diameter than the pins. A screw 20 retains the hole-scraping plate in place. The hole-scraping plate can be made from the same material as the actual scraper plate 2 and it is 0,2 to 0,4 mm greater in diameter than the hole. The body 13 comprises square holes for the ejectors 4 and the ejectors move in these holes. If the lower surface of the product 11 is not even, the upper surface of the product is given the shape of the lower surface of the product. Thus, the ejector body may not be round, or the possibility of the ejector rotating must be prevented in another way. A space made by cutting is provided under the body 13 for the return springs 12 of the ejectors 4. In cases where the pieces are of the size shown in the Figure, the total spring force is about 80 N. A bottom plate 14 is fixed under the body 13 for the purpose of receiving the force of the springs 12, and vacuum hoses run through it to the suction pads 5 of the ejectors.
The springs 12 of the ejectors 4 can also be replaced with compressed-air cylinders, in which case the force of the printing plate 8 can be reduced. According to an embodiment, the ejectors 4, the products 11 and the printing plate 8 stay in place and the body 13, the scraper plate 2 and the guide frame (1 ) are moved back and forth so that the product moves through the scraper plate.
By using spacers, several scraper plates may be placed one on the other in order to ensure the desired result.

Claims

Claims
1. A machine for the removal of superfluous paint, comprising -a body (13) and - a guide frame (1) and
- a printing plate (8) provided with suction pads (10) that hold the products
(11), characterised in that a scraper plate (2), which is made from an elastic material and which comprises a hole that is smaller than the external dimensions of the product and through which the product (11 ) to be tidied up moves, is provided between the body (13) and the guide frame (1 ), the edge of the hole in the scraper plate (2) being pressed against the side of the product and cutting away the superfluous paint strips found on the outer sides of the product.
2. A machine for the removal of superfluous paint as defined in claim 1 , characterised in that the scraper plate (2) is 0,5 to 1 ,5 mm thick.
3. A machine for the removal of superfluous paint as defined in claim 1 , characterised in that the hole in the scraper plate (2) is 0, 1 to 1 ,0 mm smaller throughout than the external dimension of the product.
4. A machine for the removal of superfluous paint as defined in claim 1 , characterised in that compressed air (6) is blown above and under the scraper plate (2) alternately, and air is sucked (7) from the other side so that the air goes through the openings in the scraper plate (2).
5. A machine for the removal of superfluous paint as defined in claim 1 , characterised in that the pins (18) of hole scrapers (3) made in the possible holes in the product are floating.
6. A machine for the removal of superfluous paint as defined in claim 1 , characterised in that the machine comprises an ejector (4) that is intended to support the product (11) and to return it to its initial position and that moves inside the body (13).
PCT/FI2000/000002 1999-01-07 2000-01-04 Extrinsing paintrest erasing machine WO2000040413A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI990011A FI108285B (en) 1999-01-07 1999-01-07 Device for removing excess ink
FI990011 1999-01-07

Publications (1)

Publication Number Publication Date
WO2000040413A1 true WO2000040413A1 (en) 2000-07-13

Family

ID=8553266

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI2000/000002 WO2000040413A1 (en) 1999-01-07 2000-01-04 Extrinsing paintrest erasing machine

Country Status (2)

Country Link
FI (1) FI108285B (en)
WO (1) WO2000040413A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110142250B (en) * 2019-06-09 2020-12-08 灵璧县浩翔信息科技有限公司 Construction waste steel structure recycling paint removing device

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4922821A (en) * 1986-08-02 1990-05-08 Dai Nippon Insatsu Kabushiki Kaisha Cleaning system of printing press
US5065675A (en) * 1991-02-07 1991-11-19 R. R. Donnelley & Sons Company Boundary layer air scraper for a rotogravure printing press
US5476043A (en) * 1993-09-16 1995-12-19 Riso Kagaku Corporation Method and device for post-processing a printed image in a printing device
US5671675A (en) * 1995-04-13 1997-09-30 Riso Kagaku Corporation Print image treatment device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4922821A (en) * 1986-08-02 1990-05-08 Dai Nippon Insatsu Kabushiki Kaisha Cleaning system of printing press
US5065675A (en) * 1991-02-07 1991-11-19 R. R. Donnelley & Sons Company Boundary layer air scraper for a rotogravure printing press
US5476043A (en) * 1993-09-16 1995-12-19 Riso Kagaku Corporation Method and device for post-processing a printed image in a printing device
US5671675A (en) * 1995-04-13 1997-09-30 Riso Kagaku Corporation Print image treatment device

Also Published As

Publication number Publication date
FI990011L (en) 2000-07-08
FI990011A0 (en) 1999-01-07
FI108285B (en) 2001-12-31

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