JPH0122826B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a masking jig for covering an unpainted part when painting a part of an object.

Recently, automobile bumpers have been made of resin, which has higher elasticity and absorbs shock than metal bumpers, in order to improve the car body protection function in the event of a light collision and to increase the degree of freedom in shaping. There is also a tendency to add decorative coloring to resin bumpers. As a method of imparting this color, a method of painting is preferred because it can provide a higher aesthetic appearance than a method of directly mixing pigments into the resin material of the bumper.

For example, when painting synthetic resin bumpers, a so-called pattern painting method, in which the bumpers are painted in different colors along their longitudinal direction, is being considered. In this case, it is necessary to mask the parts that will not be painted or the parts that will be painted with another color.

The masking jig should preferably be one that deforms and adheres closely to the resin bumper to be coated, and expands and contracts with the bumper, in order to prevent paint from getting caught up and to eliminate deviations in the parting line when the paint film dries. Traditionally, masking tape has been used.

However, masking tape requires a considerable amount of time and effort in masking work because it bends easily and does not produce a beautiful parting line (the boundary line between painted and non-painted surfaces) unless it is applied carefully by hand. It takes. In addition, if the masking tape is removed when curing the paint film in the drying oven, the parting line is likely to be disturbed by the flow of paint, so it is common to proceed with the work from the primer coat to the top coat with the masking on. It is. For this reason, the paint is baked onto the masking tape, making it disposable. However, in a mass production line, it is undesirable to dispose of masking tape after one unit because it increases costs.

The present invention has been made in view of the above-mentioned conventional problems, and provides a masking jig that can be easily, reliably and quickly implemented as an alternative to masking tape, and more preferably can be used again. The purpose is to reduce the cost of masking work and simplify the work.

In order to achieve such an object, the painting masking jig of the present invention is made of a stretchable film that does not allow paint to penetrate, and has a string-like stretchable edge member formed on at least one side edge of the film. It is characterized in that a mooring tool is provided at the end to engage with a fastener of a workbench on which the object to be coated is placed.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of the present invention will be described in detail below based on embodiments shown in the drawings.

FIG. 1 is a work explanatory diagram showing an example of a masking work performed using a masking jig for painting according to the present invention. In the figure, 1 is a workbench,
Reference numeral 2 designates a resin bumper as an object to be coated, 3 a masking jig, 4 a locking tool, 5 a cover jig, 6 a painting gun, and 7 a roller.

The workbench 1 is equipped with a bumper holder 9 and a locking tool 4 on a trolley 8, and the resin bumper 2 is fixed on the bumper holder 9 using a masking jig 3, and then left as is. It can be moved to any location while it is in a fixed state, that is, in a masked state. Therefore, after painting, the entire workbench 1 is carried into a drying oven and baked.

The masking jig 3 is made of a stretchable heat-resistant film that does not allow paint to penetrate, and has a string-like stretchable edge member 3b formed on at least one side edge thereof, and a mooring tool 3c provided at the end of the edge member 3b. ing. Since this masking jig 3 is heated together with the resin bumper 2 in a drying oven, it is required to be made of a material that has heat resistance and elasticity that can follow the expansion and contraction of the resin bumper 2. It is made of synthetic resin (elastic material) such as silicone, urethane, etc. Further, the coating portion 3a covering the non-painted surface of the masking jig 3 is formed into a film shape with a thickness of about 0.5 mm in order to maintain elasticity. In order to prevent the corner portions at both ends of this coating portion 3a from being torn when pulling the edge member 3b,
As shown in FIG. 1, it is formed into a quarter circle with radius R.
Further, at least one side edge of the masking jig 3 is provided with a string-like edge member 3b. This edge member 3b is formed to be about 10 to 20% wider than the groove 2b of the resin bumper 2, and is designed to narrow the width and fit into the groove 2b by being pulled. Here, the cross-sectional shape of the edge member 3b is circular, but is not limited to this. For example, the cross-sectional shape of the edge member 3b is made to correspond to the shape of the groove 2b formed in the resin bumper 2 in order to securely set the masking jig 3 in a predetermined position and obtain a good parting line. Various shapes may be selected as shown. In addition, the edge member 3b is not only fitted into the groove 2b, but also forms a step S in which the non-painted surface B side is recessed at the boundary between the painted surface A and the non-painted surface B of the resin bumper 2, and is pressed against this portion. In other cases, it may simply be pressed against the boundary between the painted surface A and the non-painted surface B, which have no groove 2b or step S. In this embodiment, the coating portion 3a and the edge member 3b of the masking jig 3 are integrally formed of the same material, but may be formed separately of different materials or the same material. You can also stick things together and integrate them. Furthermore, a masking jig 3 that is placed over the resin bumper 2 on the workbench 1 is attached to the end of the edge member 3b of the masking jig 3.
A locking tool 3c is provided which engages with a locking tool 4 on the workbench 1 when it is fixed on the workbench 1. This mooring tool 3c may be of any type as long as it can be engaged with the fastening tool 4 of the workbench 1 and will not come off accidentally.For example, as shown in FIG. It may be a simple loop, or it may be a hook shape as shown in FIG.

A cover jig 5 that further covers the masking jig 3 described above is used to cover the coating portion 3a of the masking jig 3 during painting.
It is made of a U-shaped cross section with both ends bent along the outer shape of the resin bumper 2. Since this cover jig 5 does not constitute a parting line but prevents paint from being applied to the coating portion 3a of the masking jig 3, it is sufficient to press it against the resin bumper 2 only during painting. Therefore, since the cover jig 5 does not need to expand and contract together with the resin bumper 2, it is possible to use metal such as aluminum in addition to hard synthetic resin.

Masking work is performed as follows using the masking jig 3 configured as described above.

First, when the workbench 1 is carried into the masking process, the resin bumper 2, which is the object to be coated, is placed on the bumper holder 9. Next, the masking jig 3 is installed to cover a predetermined position of the bumper 2, that is, the non-painted surface B. At this time, the masking jig 3 is stretched completely by pulling the edge member 3b, and is attached to the locking tool 4 of the workbench 1 using the anchoring tools 3c at both ends with the masking jig 3 being placed over the resin bumper 2. . At this time, the string-shaped edge member 3b constituting the edge of the masking jig 3 is originally formed to be slightly larger than the groove 2b of the resin bumper 2, but since it becomes thinner by being pulled, it is fitted into the groove 2b. It has a shape suitable for. Therefore, the roller 7 is used to push the edge member 3b into the groove 2b and securely set it.
Edge member 3b fitted into groove 2b of resin bumper 2
deforms along the resin bumper 2 and comes into close contact with the resin bumper 2, thereby preventing paint from being drawn into the non-painted surface B and forming a good parting line without any disturbance. In addition, if the masking jig 3 is pulled too much, the shape of the edge member 3b becomes smaller than the groove 2b, which causes the problem that paint gets caught during painting, making it impossible to obtain a good parting line. . Therefore, the total length of the masking jig 3 is approximately 10% of the masking jig 3/edge member 3b, taking into account various conditions such as the size of the resin bumper 2 and the position and height of the locking tool 4 on the workbench 1. It is preferable to have a size that can be stretched to a certain extent and set. Furthermore, even if the resin bumper 2 is not provided with the groove 2b into which the edge member 3b of the masking jig 3 is fitted, the edge member 3b of the masking jig 3, which is covered with the resin bumper 2 in a tensioned state, does not meander and is made of resin. Since it is in close contact with the bumper 2, a beautiful parting line can be formed without any disturbance.

Thus, the masking work is quickly completed by simply covering the resin bumper 2 without paying special attention to the disturbance of the parting line.
Moreover, in this masking, the masking jig 3 expands and contracts following the expansion and contraction of the resin bumper 2 that occurs when the paint is baked in the drying oven, so problems such as deviation of the parting line do not occur.

Therefore, the painted surface A of the resin bumper 2 is painted using a painting gun 6. Here, preferably, the coating portion 3a of the masking jig 3 is further masked with a cover jig 5 before painting. After painting, the cover jig 5 is released, and the resin bumper 2, together with the workbench 1, is carried into a drying oven and baked. At this time,
Since the masking jig 3 fixes the resin bumper 2 while masking the non-painted surface B of the resin bumper 2, the boundary between the painted surface A and the non-painted surface, that is, the parting line, does not move. Moreover, masking jig 3
Since the paint applied to the coating portion 3a is received by the cover jig 5, the coating portion 3a is prevented from becoming hard, which is difficult to coat, and can be reused.

In addition, as in the other embodiment shown in FIG.
can be defined. In this case, the central portion indicated by the symbol C is made narrower by about 15% than the bumper shape C', and is stretched and expanded when the edge member 3b is pulled. That is, the masking jig 3 is hung on the resin bumper 2 by applying the edge member 3b of the center portion C of the masking jig 3 to the step S portion of the resin bumper 2.

Further, as in another embodiment shown in FIG. 4, the masking jig 3 may be mounted using a single groove 2b formed in the resin bumper 2 for positioning the masking jig. In this case, the width L of the coating portion 3a is
In order to prevent paint from being rolled in, the width must be wider than the actual non-painted surface B of the resin bumper 2, but if it is too wide, the coating portion 3a becomes heavy and the edge member 3
This is not preferable because it tends to float up from the groove 2b. Therefore, the jig width L in this embodiment is l
It is preferable that the range is <L≦2l.

As is clear from the above description, the masking jig of the present invention is made of a stretchable film that does not allow paint to penetrate, and has a string-like stretchable edge member formed on at least one side edge of the film. Since a mooring device is provided at the end that engages with the mooring device of the workbench on which the workpiece is placed, it is easy to wrap it over the resin bumper that is the workbench placed on the workbench. Masking can be completed without much effort. In addition, this masking jig is
It has elasticity as a whole and can be installed in close contact with the resin bumper at its edges, so even if the resin bumper expands and contracts from the time of primer coating to the completion of topcoating, it can expand and contract following this expansion and contraction. There is no deviation in the parting line.

Furthermore, if you apply a cover jig over the masking jig and mask the coated area only when painting, the masking jig will not be covered with paint.
It is possible to prevent the hardening caused by the coating of the coating part.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram of the painting work when the masking jig according to the present invention is used, and Fig. 2 is the − of Fig. 1.
The line enlarged sectional view and FIG. 3 show another embodiment of the masking jig, in which a is a perspective view of the masking jig, b is a perspective view showing the general appearance of a resin bumper as an object to be coated, and c is a - 4 shows another embodiment of the masking jig, a is a perspective view of the masking jig, b is a perspective view showing the general appearance of the resin bumper, c is an enlarged cross-sectional view along the - line, Figure 5 a~
FIG. 6c is a cross-sectional view showing another embodiment of the edge member of the masking jig and the groove shape of the resin bumper, and FIG. 6 is a perspective view showing another embodiment of the anchoring tool and the locking tool. 1...Workbench, 2...Resin bumper as the object to be coated,
3... Masking jig, 3a... Coating part, 3b...
... Edge member, 3c... Mooring tool, 4... Locking tool, 5...
...Cover jig, A...painted surface, B...non-painted surface.

Claims (1)

[Claims] 1. A workbench locking tool, which is made of a stretchable film that does not allow paint to penetrate, and has a string-like stretchable edge member formed on at least one side edge of the film, and a workpiece to be coated is placed on the edge of the edge member. A masking jig for painting that is equipped with an engaging mooring tool.