JPH044847Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a masking device for covering unpainted areas of an object when painting the object.

[Technical background]

When there is a part of the object to be coated (non-painted part) in spray painting etc., it is necessary to mask the non-painted part by some method.

For example, since it is necessary to attach equipment such as a transmission to the front and back of a cylinder block of an automobile engine, both end faces are usually not painted.

Therefore, when painting cylinder blocks, conventionally, before painting each cylinder block, masking is applied in advance to both end surfaces that should not be painted using a masking sheet, masking tape, or masking compound.

Masking sheets or masking tapes are applied to non-painted areas and removed once the paint has dried after painting, but this work must be done manually, which is extremely inefficient, and masking sheets, etc. are disposable. This has the disadvantage of increasing running costs.

Masking compound is a special water-soluble paint that is applied to non-painted areas before painting and washed off with water once the paint has dried. Although it is possible to automate the cleaning work, there is a disadvantage that the equipment cost increases and running costs also increase because it is disposable.Also, the process of applying masking compound and cleaning process must be provided separately. The drawback was that the overall efficiency of the painting work was reduced.

[Purpose of invention]

Therefore, the present invention has been developed to provide a masking device for objects to be coated that can easily perform masking with a relatively simple configuration, reduce running costs, and significantly improve the efficiency of masking work and ultimately painting work. The purpose is to provide.

[Structure of the idea]

In order to achieve this purpose, the present invention has a masking plate that is arranged so as to be movable in relation to the object to be coated.
When it is retreated from the object to be coated, it is housed so as to be sandwiched between a pair of paint scraping plates attached to a rotating shaft, and is driven to rotate while the paint scraping plate is in sliding contact with the masking plate. The coating material adhering to the surface of the masking plate is scraped off.

[Effect of invention]

According to the present invention, since the masking plate is arranged so as to be able to move forward and backward with respect to the object to be coated, a predetermined non-painted part of the object to be coated is covered by simply moving the masking plate forward, thereby speeding up the masking work. It can be carried out. Furthermore, if the masking plate is moved back and the paint scraping plate is rotated after painting is completed, the paint scraping plate will slide against the masking plate and the paint adhering to the surface of the masking plate will be immediately scraped off. removed.

〔Example〕

Hereinafter, the present invention will be explained based on specific embodiments shown in the drawings.

FIG. 1 is a front view showing an embodiment of the device of the present invention;
FIG. 2 is a side view thereof, and FIG. 3 is a front view showing a coating apparatus using the apparatus of the present invention.

1 in the figure is a painting booth, and the painting booth 1
Inside, there are rails 3 on which objects 2 to be coated, such as engine cylinder blocks, are conveyed at intervals, and a work lifter that lifts the objects 2 stopped at a predetermined position on the rails 3 to a coating position above the rails 3. An air cylinder 4, called an air cylinder 4, an air spray gun 5 that sprays paint onto the object 2 at the painting position, and a masking device 6 that covers non-painted areas of the object 2 are provided.

The masking device 6 includes masking plates M, M... that come into contact with both end surfaces of the object to be coated 2 at the coating position.
and a scraping device K for scraping off the paint adhered to the masking plate M, and is supported by a base 7 disposed near the painting position.

The masking plate M is formed by molding, for example, a Teflon resin plate into a predetermined shape according to the shape of the object 2 to be coated, and is fixed at right angles to the support shaft 8 at intervals equal to the length of the object 2 to be coated. By rotating 8, it is moved forward and backward from the object 2 to be coated which is being transported to the coating position, and is brought into contact with both end surfaces of the object 2 to be coated.

The spindle 8 is supported by a bearing 9 fixed to the base 7 and arranged parallel to the rail 3, and has a swing arm 10 fixedly attached to its tip for rotating the spindle 8. .

Reference numeral 11 denotes an air cylinder that moves the masking plate M forward and backward by swinging the arm 10 and rotating the support shaft 8, and its bottom end is connected to a cylinder bracket 12 fixed to the base 7. The piston rod 13 is attached so as to be swingable, and the tip of the piston rod 13 is connected to the tip of the arm 10 in a paired manner.

That is, when the air cylinder 11 is extended, the arm 10 and the support shaft 8 are rotated counterclockwise in FIG. When contracted, the arm 10 and the support shaft 8 are rotated clockwise in FIG. 1, and the masking plate M is retreated to the position shown by the chain line in FIG.

Note that 14U and 14D are limit switches that control the length of expansion and contraction of the air cylinder 11, and 15U and 15D are operators that move in conjunction with the piston rod 13 and come into contact with the limit switches 14U and 14D to perform on/off operations. .

The scraping device K includes an edge plate 20 as a paint scraping plate that is in sliding contact with the masking plate M, and a rotating shaft 21 that rotates the edge plate 20.
It consists of a geared motor 22 that drives the rotating shaft 21.

The rotating shaft 21 is disposed parallel to the support shaft 8 of the masking plate M, and three pairs of mounting arms 23 for mounting and supporting the edge plate 20 are mounted on the support shaft 8 at positions corresponding to the mounting positions of the masking plate M. Fixed at a corner.

The edge plate 20 is molded, for example, from Teflon resin, and is mounted and supported by a pair of mounting arms 23 and 23 in parallel at intervals approximately equal to the thickness of the masking plate M, so that the masking plate M is retracted from the object 2 to be coated. When the edge plates 23 and 23
When the geared motor 22 is started in this state, the edge 20a of the edge plate 20 slides on the masking plate M, and the paint adhering to the masking plate M is scraped off. ing.

The above is an example of the configuration of the present invention, and its operation will be explained next.

First, when the objects 2 and 2 to be coated, such as cylinder blocks, are intermittently conveyed on the rail 3 and stopped at predetermined positions, the air cylinder 4 is extended and the objects 2 and 2 to be coated are raised to the coating position.

Next, the air cylinder 11 of the masking device 5
When extended, the support shaft 8 is moved through the swing arm 10.
is rotated counterclockwise in FIG. 1, and the masking plates M, M, .

In this state, from the air spray gun 5 to the object 2 to be coated.
When the paint is sprayed on the objects 2 and 2, only the side surfaces are coated without being painted since both end surfaces are covered with the masking plate M. When the prescribed coating is completed, the air cylinder 4 is contracted and the objects 2 and 2 to be coated are is again placed on the rail 3 and transported to the next process.

Next, the air cylinder 11 of the masking device 6
When contracted, the support shaft 8 is moved through the swing arm 10.
is rotated clockwise in FIG. 1, and the masking plates M, M, .

Here, when the geared motor 22 is started and the rotating shaft 21 is rotationally driven in the counterclockwise direction in FIG. The paint adhered to the surface of the masking plate M is surely and quickly scraped off by the plate 20.

When the scraping operation is completed, the edge plate 20 stops rotating and waits until the next objects 2 and 2 to be coated are transported to the coating position.

In this way, according to this embodiment, masking can be applied to non-painted areas of the object 2 by simply moving the masking plate M forward and backward, so the time required for masking is significantly shortened, and the masking work and The efficiency of painting work can be greatly improved.

Furthermore, since the paint adhering to the masking plate M is scraped off by the scraping device K, the masking plate M
can be used many times in a clean condition, reducing running costs.

In addition, in the description of the above embodiment, only the case where the masking plate M is rotated to advance and retreat to the painting position has been described, but the means for advancing and retreating is not limited to this, and any means can be applied.

Further, in the embodiment, a case has been described in which three pairs of edge plates 20 are provided, but in the present invention, it is sufficient to provide at least one pair.

[Effect of idea]

As described above, according to the present invention, when the masking plate advances toward the painting position, it comes into contact with the object to be coated and covers a part of it.
Since the time required for masking can be significantly shortened, the efficiency of masking work and, ultimately, painting work can be greatly improved, which is an excellent effect. In addition, since the paint adhering to the masking plate is reliably and quickly scraped off by the scraping device, it can be used immediately on the subsequently transported object to be coated, and it can be used over and over again. As a result, masking work can be performed more efficiently and running costs can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a front view showing an embodiment of the device of the present invention;
FIG. 2 is a plan view thereof, and FIG. 3 is a front view showing a coating apparatus using the apparatus of the present invention. Explanation of symbols, 1...Painting booth, 2...Object to be painted, 3...Rail, 5...Air spray gun, 6
...Masking device, M...Masking plate, K...
...Scraping device, 8... Support shaft, 11... Air cylinder, 13... Piston rod, 20... Edge plate, 21... Rotating shaft, 22... Geared motor, 23... Mounting arm.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A pair of paint scraping plates attached to a rotating shaft when the masking plate, which is arranged to move forward and backward with respect to the object to be coated, is retreated from the object to be coated. The paint scraping plate is accommodated in between and rotated while being slid on the masking plate to scrape off paint adhering to the surface of the masking plate. A masking device for objects to be coated. (2) The masking device for the object to be coated according to claim 1, wherein the paint scraping plate is a plurality of edge plates disposed equiangularly around the rotating shaft.