JPS6232976B2 - - Google Patents

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention relates to a side seam of a can body that is transported in a horizontal direction with the side seam facing upward and the can axis horizontal;
In particular, the present invention relates to a device for applying paint to the outer surface of side joints joined by welding.

(Prior art) Can body side seams by welding are made by rounding a steel plate blank cut to a predetermined size, overlapping both end edges to form a cylindrical body, making the axis of the cylindrical body horizontal,
In most cases, the cylinder is advanced in the axial direction of the cylindrical body with the overlapping part facing upward, and while the cylinder is moving, the overlapping part is passed between upper and lower electrodes and resistance stitch welding is performed. The inner and outer surfaces of this welded side joint are blanked and painted in advance because the protective coating of the steel plate blank is removed or made extremely thin due to heating and pressure during welding, and after welding,
It is necessary to protect the inner and outer surfaces of the side joints by applying a protective coating.

To apply a protective coating to the inner and outer surfaces of the side seam after welding, paint is applied to the inner surface by continuing to advance the welded can body in the horizontal direction and bringing the inner surface of the joint into contact with a coating roll during the progress. After coating the inner surface, the can body is rotated 180 degrees around its axis with the side seam facing down, and the can body is advanced in this state, and the side seam is The paint is applied by bringing the outer surface into contact with a coating roll.

(Problems to be solved) However, after welding, the inner surface is painted,
After that, rotate the can body and paint the outside.
The time during which the outer surface of the side seam, which is still in a high temperature state due to welding residual heat, is in contact with air becomes longer, and the oxidation of the outer surface of the side seam progresses accordingly, which is undesirable from the viewpoint of corrosion resistance and appearance.

In addition, it is difficult to accurately rotate the can bodies, which are manufactured at high speed and transported one after another, by 180 degrees around the axis of the can body, and the can manufacturing line becomes longer due to the rotation equipment. This is also unfavorable from the viewpoint of workability and effective use of factory space.

An object of the present invention is to solve the above-mentioned drawbacks by applying paint to the outer surface of the side seam while the welded can body is moving horizontally in the direction of the can axis with the side seam facing upward. The objective is to provide a coating device that can.

Another object of the present invention is to provide a coating device that can always apply paint to the outer surface of the side seam with a constant width and constant thickness.

Still another object of the present invention is to provide a coating device that prevents paint from falling onto the can barrel from a coating roll placed above the position where the can barrel passes.

(Means for Solving Problems) The present invention is an apparatus that is located above a can body that moves in the horizontal direction with the side seam facing upward and the can shaft horizontally, and that paints the outer surface of the side seam. ) A felt applicator roll having an outer circumferential surface in contact with the outer circumferential surface of the side seam of the can body and installed parallel and perpendicular to the can axis of the can body; (b) Prior to the contact of the applicator roll with the side seam, a paint restriction device that restricts the paint on the outer circumferential surface of the applicator roll; (c) an intermediate roll having an outer circumferential surface in contact with the outer circumferential surface of the applicator roll and provided parallel to and perpendicular to the can axis of the can body; A paint take-up roll that is located in the lateral direction of the intermediate roll, has an outer peripheral surface in contact with the outer peripheral surface of the intermediate roll, is provided parallel to and perpendicular to the can axis of the can body, and is partially immersed in the paint in the paint tank. , (e) a paint restriction device for restricting the paint on the paint take-up roll before the paint take-up roll comes into contact with the intermediate roll, and (f) the paint restriction device for the applicator roll is configured to having a side part in contact with the side surface of the roll and a central part in contact with the outer circumferential surface of the applicator roll, (g) the side part having an inclined groove that descends in a direction away from the applicator roll;
(H) The welded can body, wherein the central part has an inclined upper surface that descends in a direction away from the applicator roll, and a through hole that passes through the central part from the lowest point of the inclined upper surface. The side joints are painted on the outside.

(Function) In the present invention, there is provided a paint pickup roll partially immersed in the paint in the paint tank, an intermediate roll having an outer peripheral surface that contacts the outer peripheral surface of the paint pickup roll, and an intermediate roll that has an outer peripheral surface that contacts the outer peripheral surface of the intermediate roll. A coating roll with an outer circumferential surface that contacts is used, and it is installed above the can body through which all three coating rolls pass, parallel to and perpendicular to the can axis, so that the side seam is facing upward. Paint can be applied to the outer surface of the side seam of a can body moving in the horizontal direction, and the paint transferred from the intermediate roll to the felt applicator roll contacts the side seam of the can body. The width of the coating roll is modified by means of a paint limiting device with side parts and a central part, which corrects the width of its outer circumferential surface and removes excess paint, so that the side seams always have the same shape and the same amount of paint. Since the outer circumferential surface of the applicator roll on which the coating material is attached is in contact with the outer circumferential surface of the side seam, it is possible to always apply a coating material having a substantially constant width and constant thickness (i.e., a constant amount of coating material) to the outer surface of the side seam.

Furthermore, in the present invention, since the paint-restricting device is provided on the paint-picking roll, excess paint does not transfer from the paint-picking roll to the intermediate roll.
Almost no paint is thrown away during the rotation of the intermediate roll, and it does not fall onto the can barrel passing under it.

(Example) A specific example of the coating apparatus of the present invention will be explained with reference to the drawings. Fig. 1 is a front view of the coating device of the present invention, Fig. 2 is a sectional view taken along the line - - in Fig. 1, Fig. 3 is an enlarged front view of the coating roll coating restricting device, and Fig. 4 is a top view of Fig. 3. It is a diagram.

In the figure, A is a can body that moves horizontally in the direction of arrow Z at predetermined intervals with the welded side seam facing up, and B is the outer surface of the side seam provided above the can body. It is a painting device.

Here, the felt applicator roll is indicated by 2, the intermediate roll by 11, the paint take-up roll by 23, the paint restricting device for the applicator roll by 10, and the paint restricting device for the paint take-up roll by 26. Among these, each roll 2, 1
Both rolls 1 and 23 are provided parallel to and perpendicular to the can axis of the can body, in other words, these rolls are located on the same plane. Reference numeral 1 denotes a vertically fixed substrate to which these rolls are attached, and the coating roll 2 is rotatably attached to the substrate 1 at a position where its outer circumferential surface 20 contacts the side seam of the can body. (6 is its rotatable shaft; 3 and 3' are presser plates that hold the coating roll from the front and back sides) A first gear 7 is fixed to this shaft 6 with the substrate 1 interposed therebetween.

The coating roll paint restriction device (details will be described later) is
It is placed in such a position that it can come into contact with the applicator roll before it comes into contact with the can body, and in the illustrated example, it is provided on the left side of the applicator roll because the applicator roll 2 rotates counterclockwise.

The intermediate roll 11 is located above (not necessarily directly above) the coating roll 2, and its outer circumferential surface 21 is in contact with the outer circumferential surface 20 of the coating roll.
This is fixed to a rotating shaft 12 and rotatably attached to the substrate 1. In addition, at the other end of this shaft 12,
A second gear 15 having the same diameter as the first gear 7 and meshing with the first gear 7 is fixed. A sprocket 16 is fixed to the shaft 12 and connected to a drive sprocket (not shown) through an endless chain.

The paint take-up roll 23 has its outer peripheral surface 22 in contact with the outer peripheral surface 21 of the intermediate roll 11 and rotates in the opposite direction to the intermediate roll. This roll 23 is also fixed to a rotating shaft and rotatably attached to the substrate 1, and a second gear 15 is attached to the other end of the rotating shaft.
The third gear, which has the same diameter as the gear 15 and meshes with the gear 15, is fixed, and is not shown because it is the same as in the case of other rolls. A part of this paint picking roll 23 is immersed in the painting process in a paint tank 31 placed below, and the paint supplied into the tank from the pipe 32 adheres to its outer circumferential surface 22. A paint limiting device 26 serves to transfer the paint to the outer peripheral surface of the intermediate roll 11 (33 is a detection unit for controlling the amount of paint flowing into the tank). It is provided on the opposite side of the contact point between the pick-up roll 23 and the intermediate roll 11 and above the paint tank. This restriction device can be used as is, as it has been conventionally used. 27 is a component for fixing the restriction device 26 to the board 1.

When the fixed sprocket 16 of the intermediate roll 11 is rotated clockwise, these three rolls are rotated to the first position.
Since the gear 7 and the second gear 15 are in mesh with each other, and the second gear 15 and the third gear are in mesh with each other, as shown in the figure, the intermediate roll moves clockwise and the application roll 2
and the paint take-up roll 23 rotate counterclockwise in contact with each other.

Paint pick-up roll 2 rotating counterclockwise
3 is the paint restriction device 2 after being taken up from the paint tank.
6, the paint adhered to the outer surface is scraped off to a predetermined thickness. The scraped paint returns to the paint tank. The paint take-up roll with a predetermined thickness of paint adhered to the outer circumferential surface 22 rotates further, contacts the outer circumferential surface 21 of the intermediate roll 11, and transfers the paint to the outer circumferential surface of the intermediate roll. The intermediate roll 11 adheres the paint to its outer peripheral surface 21 and rotates clockwise to transfer the paint to the outer peripheral surface 20 of the applicator roll 2.
The coating roll 2, which has received the paint on its outer peripheral surface 20, limits the amount of adhering paint to a predetermined amount by the paint limiting device 10 of the coating roll 2, and then applies the paint to the side seam of the can body in progress. 20 comes into contact and applies paint. The paint restriction device 10 also serves to correct the spreading deformation caused by the felt outer peripheral surface 20 of the applicator roll 2 being pressed against the side seam when applying paint to the side seam. Such limiting and correcting functions have been performed by conventional application roll paint limiting devices and are not new, but the can body to be coated in the present invention has a side seam on the upper side,
Therefore, since the can body passes under the application roll,
Since it is not possible to use a conventional restriction device suitable for the conventional mode (can body passed over the applicator roll partially immersed in the paint in the paint tank with the side seam facing down), We must develop something with a new structure. In this respect, the paint restriction device for the paint take-up roll is different from the conventional device which can be used as is. Specific structural examples thereof are shown in FIGS. 3 and 4 (described later).

Now, the features of the coating device of the present invention are as follows.
A paint limiting device is provided for each of the paint take-up roll and the application roll. The provision of the former paint restriction device prevents paint from falling onto the can barrel from the pick-up roll, and the latter paint restriction device allows a nearly constant amount of paint to be applied to every can barrel during mass production. I can do it.

Since the apparatus of the present invention is the first apparatus for painting the outer surface of the seam of a moving can body with the side seam facing upward, it cannot be compared with conventional apparatus. A comparison with the case without these paint restriction devices will be explained below.

First, if there is no paint restriction device 26 for the paint take-up roll, the amount of paint in the paint tank will repeat increases and decreases within a certain range (the amount of paint supplied to the tank/time will depend on the amount of paint taken up by the take-up roll). Normally, the amount of paint in the tank is slightly higher than the amount/time, so the amount of paint in the tank gradually increases, and when this is detected by the detection unit, the supply of paint is stopped, and after a certain period of time, the amount of paint in the tank decreases. The amount and thickness of paint adhering to the paint pick-up roll will increase or decrease accordingly, and the amount of paint that will accumulate in the groove between the paint pick-up roll and the intermediate roll will also increase or decrease. It increases and decreases, and when it increases, some of it flows down from the groove to both sides of the roll and enters the paint tank below.
This results in some sticking to the sides of the intermediate roll and being thrown off during rotation. This blown paint stains the can body and equipment. However, by using the paint restriction device 26, such drawbacks can be completely eliminated.

Next, if there is no paint restriction device for the applicator roll, since the applicator roll is made of felt, when it comes into pressure contact with the side seam, the pressure will deform the outer circumferential surface in a direction that expands, resulting in numerous contact with the side seam. As the pressure contact is repeated, the material eventually deforms to the point where it does not come into pressure contact with the side seam, and this deformation causes a reduction in the amount of paint received from the intermediate roll, resulting in a reduction in the amount of paint applied to the side seam. However, when the paint restriction device 10 is used, the width of the felt outer peripheral surface of the applicator roll is corrected every rotation, and it always has the same shape and is in contact with the side seam and with the intermediate roll, so a nearly constant amount of paint is always applied to the side surface. It can now be applied to the outer surface of the seam.

As mentioned earlier, the coating roll coating restricting device of the present invention cannot be of the conventional type at all, so the one illustrated in FIGS. 3 and 4 was used.

FIG. 3 is a plan view including the paint restricting device and part of the coating roll, and FIG. 4 is a side view of FIG. 3.

3 and 4, the paint restriction device 10 has side parts 40, 40' and a central part 45. In FIGS.

The side parts 40, 40' are in contact with the side surfaces of the applicator roll 2 (in the figure, the presser plates 3, 3'), and correct the side surfaces of the felt and restrict the paint.
It serves to scrape off paint adhering to the side surfaces of the slanted walls 41, 4 that are in contact with the holding plate.
1', straight walls 44, 44' that contact the felt part and fix the side parts to the central part, these inclined walls;
The outer walls 42, 42' extend outward from the lower end of the straight wall and are folded upward, and are formed between these inclined walls, the straight wall, and the outer wall, and are coated to allow the scraped paint to flow down into the receiving tank 51 below. It has inclined grooves 43, 43' that descend in the direction away from the roll (from right to left in FIG. 3).

The central part 45 is for forming the outer peripheral surface of the application roll 2, and the straight walls 44, 4 are provided on both sides of the central part 45.
4' are in contact. Reference numeral 47 indicates a contact portion having a surface that contacts the outer circumferential surface 20 of the coating roll at the tip portion of the central part 45, and 48 indicates a contact portion that is inclined in a direction away from the coating roll 2 from the tip portion 47 (toward the lower left in the figure). ) is formed on the inclined upper surface 48.
A vertical through hole 50 opening downwardly through the central part from the inclined upper surface 48 is provided at the lowest point of the sloping upper surface 48.
is provided. 49 is a fixed part integrally formed with the central part 45; 52 is a mounting arm located at the upper center of the receiving tank 51 and fixed to the receiving tank 51 by extending from the rear end toward the application roll; 53, 5;
3' is a bolt for fixing the fixed portion 49 to the mounting arm 52, and 54 is a pipe for discharging the paint in the receiving tank.

Since the paint restricting device of this specific example has the above-described configuration, when the coating roll is rotating counterclockwise, the paint adhering to the side surface of the presser plate 3 is scraped off by the inclined walls 41, 41'. The sides of the felt are reshaped with straight walls 44, 44' to have a width equal to the spacing between the straight walls 44, 44', and the paint adsorbed to the felt is squeezed out during reshaping. The scraped and squeezed paint flows down along each wall, enters the grooves 43, 43', and is guided into the receiving tank 51.
to go into.

The outer peripheral surface 20 of the applicator roll is also reshaped by the tip 47 of the central part 45 after the felt side surface is reshaped as described above, at which time the paint is forced out of the felt. The extruded paint flows down along the inclined upper surface 48 of the central part 45, flows down the through hole 50,
It enters the receiving tank 51.

As described above, the coating roll 2 that has passed through the paint restricting device 10 has its outer circumferential surface 20 reshaped in both width and surface, and excess paint is scraped off and squeezed out. Paint of the same width and thickness (a certain amount) is always applied, avoiding unnecessary paint consumption.

As seen in FIG. 4, an annular recess 61 is provided in the center of the outer circumferential surface 20 of the felt of the applicator roll, and the annular recess 61 is provided at the part of the central part 45 that is in contact with the outer circumferential surface 20. When forming the recess 60 at a location facing the annular recess 6,
First, although it is a fixed amount, a larger amount of paint can be applied to the side seam than when there is no groove.

(Effects) With the device of the present invention, protective paint can be applied to the outer surface of the side seam while the can body, which has been resistance stitch welded with the overlapping portion facing upward, is transported in the horizontal direction as it is. Since the can body rotation device and rotation work are no longer necessary, the can manufacturing line can be shortened and work efficiency is improved, and the time from welding to painting is also shortened, reducing oxidation of the outer surface of the side joints. In addition, since the protective paint can always be applied to a constant width and thickness, the necessary corrosion resistance can be imparted to the outer surface of the side seam.

Furthermore, in the apparatus of the present invention, the intermediate roll does not pick up excess paint and cause it to fall onto the can barrel, thereby staining the outer surface of the can barrel.

The apparatus of the present invention is similar to the conventional inner surface coating apparatus (for example, Japanese Patent Publication No. 38-15843 Spray coating type as disclosed in Japanese Patent Publication No. 144941, roll coating type as disclosed in Japanese Patent Application Laid-open No. 144941/1984, etc.)
When used in conjunction with this method, the interior and exterior surfaces can be painted continuously, greatly improving work efficiency.

[Brief explanation of the drawing]

FIG. 1 is a front view of one embodiment of the coating apparatus of the present invention;
FIG. 2 is a sectional view taken along the line -- in FIG. 1, FIG. 3 is an enlarged front view of the coating roll coating restricting device, and FIG. 4 is a top view of FIG. 3. A...Can body, 2...Felt applicator roll, 10...
Paint restriction device for coating roll, 11... intermediate roll,
DESCRIPTION OF SYMBOLS 20... Outer circumferential surface of application roll, 21... Outer circumferential surface of intermediate roll, 23... Paint pickup roll, 22... Outer circumferential surface of paint pickup roll, 26... Paint restriction device of paint pickup roll, 40, 40'... Side part, 43 ，
43'... Slanted groove, 45... Central part, 48... Slanted upper surface, 50... Through hole.

Claims (1)

[Scope of Claims] 1. A device that is located above a can body that moves horizontally with the side seam facing upward, and that paints the outer surface of the side seam, which has an outer circumferential surface in contact with the outer circumferential surface of the side seam of the can body; a felt applicator roll disposed parallel and perpendicular to the can axis of the shell, prior to contact of the applicator roll with the side seam;
a paint restriction device for restricting the paint on the outer circumferential surface of the coating roll; an intermediate roll located above the coating roll, having an outer circumferential surface in contact with the outer circumferential surface of the coating roll, and provided parallel to and perpendicular to the can axis of the can body; A paint pick-up roll that is located in the lateral direction of the intermediate roll, has an outer peripheral surface in contact with the outer peripheral surface of the intermediate roll, is provided parallel to and perpendicular to the can axis of the can body, and is partially immersed in the paint in the paint tank. , and a paint restriction device for restricting the paint on the paint pickup roll before the paint pickup roll comes into contact with the intermediate roll, and the paint restriction device for the coating roll is arranged on a side surface of the coating roll. It has a side part in contact with the outer peripheral surface of the applicator roll, and a central part in contact with the outer peripheral surface of the applicator roll, the side part has an inclined groove that descends in a direction away from the applicator roll, and the central part has an inclined groove in a direction away from the applicator roll. 1. A welded can body side joint outer surface coating device, characterized in that it has a descending sloped top surface and a through hole passing through the central part from the lowest point of the sloped top surface.