JP2014240040A - Painting apparatus and painting method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a painting apparatus capable of painting both of an inner surface and a bottom part outer surface of a can body without causing damage to the can body when painting the bottom part outer surface and the inner surface of the can body formed into a cup shape.SOLUTION: A painting apparatus 1 includes: a first painting turret 3 which transports a can body W; a first rotary pedestal 31 which is rotatably provided in the first painting turret 3 and suctions and holds an opening end part of the can body W; a bottom part outer surface painting mechanism 34 which paints a bottom part outer surface of the can body W with the can body W held by the first rotary pedestal 31; a second painting turrent 5 which transports the can body W discharged from the first painting turret 3; a second rotary pedestal 51 which is rotatably provided in the second paint turrent 5 and suctions and holds a can bottom part of the can body W; and an inner surface painting mechanism 54 which paints an inner surface of the can body W with the can body W held by the second rotary pedestal 51.

Description

  The present invention relates to a can coating apparatus and a coating method.

  Conventionally, in the manufacturing process of cans such as beverage cans, the inner surface of the can body (the inner peripheral surface of the can body portion) can be formed into a bottomed cylindrical shape by subjecting an aluminum plate or iron plate to a deep drawing process. The bottom surface of the can body (the outer surface of the bottom portion of the can) is painted (for example, see Patent Document 1). The coating on the inner surface and the bottom outer surface of the can body is performed by spraying paint on the inner surface and the bottom outer surface of the can body with a coating spray or the like while rotating the can body around its axis.

When the inner surface of the can body is painted, the rotating member such as a belt is in contact with the rotating base while the can body is placed on the rotating base (base) so that the bottom of the can contacts The rotating pedestal and the can body are rotated around the axis thereof.
On the other hand, when the outer surface of the bottom of the can body is painted, for example, as disclosed in Patent Document 2, the rotating member such as a belt rotates in a state where the rotating member is in contact with the outer peripheral surface of the can body (can body portion). The body is rotated around its axis. At this time, the can body is supported by a plurality of rollers that abut on the outer peripheral surface thereof.

JP-A-5-309296 JP-A-3-188963

  However, when the outer surface of the bottom of the can body is painted, if the rotating member or supporting roller is brought into contact with the outer peripheral surface of the can body, the outer peripheral surface of the can body rubs against the rotating member or the roller. There is a problem that the outer peripheral surface of the tape is damaged.

  The present invention has been made in view of the above-described circumstances, and an object thereof is to provide a can body coating apparatus and a coating method capable of painting both the inner surface and the bottom outer surface of a can body without damaging the can body. .

  In order to solve this problem, the coating apparatus of the present invention is to coat the bottom outer surface and the inner surface of a can body formed in a bottomed cylindrical shape, the first coating turret for conveying the can body, A first rotating pedestal rotatably mounted on the first coating turret and holding the opening end of the can body; and a bottom portion of the can body in a state where the can body is held on the first rotating pedestal. A bottom outer surface coating mechanism for coating the outer surface, a second coating turret for transporting the can body discharged from the first coating turret, and a can bottom portion of the can body provided rotatably on the second coating turret And a second rotating pedestal for adsorbing and holding the inner surface of the can body while the can body is held on the second rotating pedestal.

  Further, the painting method of the present invention is a method of coating the bottom outer surface and the inner surface of a can body formed in a bottomed cylindrical shape, wherein the opening end of the can body is rotatable on a first rotating base. A bottom outer surface painting step of painting the bottom outer surface of the can body while rotating the first rotating pedestal and the can body around its axis while being held by suction, and a bottom portion of the can body that is rotatable. An inner surface coating step of coating the inner surface of the can body in turn while rotating the second rotating pedestal and the can body around an axis thereof while being sucked and held on the two-rotation pedestal. .

According to the coating apparatus and the coating method, the can body can be obtained by rotationally driving the first and second rotating pedestals in both cases of painting the outer surface of the bottom of the can body and painting the inner surface of the can body. Can be rotated around the axis together with the first and second rotating pedestals. That is, the can body can be rotated about its axis without bringing the rotating member or the supporting roller into contact with the outer peripheral surface of the can body as in the prior art. Therefore, it becomes possible to paint the bottom outer surface and the inner surface of the can body without damaging the can body (particularly the outer peripheral surface).
Moreover, since the inner surface of the can body is painted after the bottom outer surface is painted, it is possible to prevent the paint on the inner surface of the can body from being peeled off.

  And the said coating apparatus is equipped with the drying turret which conveys while holding the said can body discharged | emitted from said 1st coating turret, and the said can body conveyed in this drying turret becomes said 2nd coating turret. It should be handed over.

  According to the above configuration, drying of the paint on the outer surface of the bottom of the can body can be promoted, so that the paint on the outer surface of the bottom portion is prevented from peeling off when the can bottom of the can body is adsorbed and held on the second rotating base. it can.

  Moreover, in the said coating apparatus, it is preferable that the fitting convex part inserted in the inside of the opening edge part of the said can is formed in said 1st rotation base.

When the can body is formed by deep drawing, the shape of the opening end of the can body varies, but according to the above configuration, when the can body is sucked and held on the first rotation base, the first rotation base It is possible to easily match the axis of the can body with the axis of the first rotation base by fitting the fitting convex portion into the opening end of the can body. Therefore, the bottom outer surface of the can body can be uniformly coated by the bottom outer surface coating mechanism.
When fitting the fitting convex part into the opening end of the can body, a part of the fitting convex part comes into contact with the inner surface of the can body. However, in the coating apparatus of the present invention, the bottom outer surface of the can body is painted. Then, since the inner surface of the can body is painted, the paint on the inner surface of the can body is not peeled off by the fitting convex portion.

Furthermore, in the coating apparatus, an annular convex portion having an annular shape in plan view around the axis of the can body is formed on the outer surface of the bottom of the can body,
It is preferable that a positioning groove is formed in the second rotary pedestal so as to have an annular shape in plan view with the axis of the second rotary pedestal as the center, and into which the annular convex portion is inserted.

  According to the above configuration, when the can bottom portion of the can body is sucked and held on the second rotating pedestal, the axis of the can body can be easily set by inserting the annular convex portion of the can body into the positioning groove of the second rotating pedestal. It is possible to match the axis of the second rotary pedestal. Therefore, the inner surface of the can body can be uniformly coated by the inner surface coating mechanism.

In addition, the coating apparatus stops the rotation of the first rotary base after the bottom outer surface is coated by the bottom outer surface coating mechanism and before the can body is discharged from the first coating turret. A rotation stop mechanism;
A second rotation stop mechanism for stopping the rotation of the second rotating pedestal after the inner surface is coated by the inner surface coating mechanism and before the can body is discharged from the second coating turret. .

  The first and second rotating pedestals and the can body that are rotationally driven during painting of the bottom outer surface and the inner surface continue to rotate due to the inertial force, but according to the above configuration, the can body is discharged from the first and second coating turrets. Before the rotation, the rotation of the can body can be stopped together with the first and second rotation bases by the first and second rotation stop mechanisms. For this reason, for example, when the can body discharged from the first and second coating turrets is delivered to the transport turret that holds the outer peripheral surface thereof by suction, the outer peripheral surface of the can rubs against the transport turret. Etc., and can be prevented from being damaged.

  According to the present invention, it is possible to paint the bottom outer surface and the inner surface of the can body without damaging the can body (particularly the outer peripheral surface).

It is sectional drawing of the can which is the coating object of the coating device which concerns on one Embodiment of this invention. It is a schematic plan view which shows the coating apparatus which concerns on one Embodiment of this invention. It is the schematic which shows the state which looked at the 1st rotation base with which the coating apparatus of FIG. 2 is equipped, and its peripheral structure from the side. It is the schematic which shows the state which looked at the 2nd rotation base with which the coating apparatus of FIG. 2 is equipped, and its peripheral structure from the side.

Hereinafter, an embodiment of the present invention will be described with reference to FIGS.
The coating apparatus according to this embodiment is for coating the inner surface and the bottom outer surface of a can body formed in a bottomed cylindrical shape.
As shown in FIG. 1, the can body W in the present embodiment includes a cylindrical can body portion W1 and a can bottom portion W2 provided at one end portion in the direction of the axis O1 of the can body portion W1 (can body W). Have. An annular convex portion W21 is formed on the outer surface of the can bottom portion W2 (the outer surface of the bottom portion of the can body W). The annular protrusion W21 is formed in an annular shape in plan view with the axis O1 of the can body W as the center. And the inner peripheral side of the cyclic | annular convex part W21 is the dome-shaped recessed part surface W22 recessed inside the can body W among the bottom part outer surfaces of the can body W. As shown in FIG. Further, the outer peripheral side of the annular convex portion W21 is a tapered surface W23 that inclines radially outward from the can bottom W2 side toward the opening end of the can body W along the axis O1.

And as shown in FIG. 2, the coating device 1 of this embodiment is provided with the turrets 2-6 (five in the example of illustration) which convey the can body W.
Each of the turrets 2 to 6 is formed in a substantially circular shape in plan view, and is configured to hold the can body W at the peripheral edge thereof. Moreover, each turret 2-6 is comprised so that it may rotate intermittently around the rotating shaft line (arrow R2-R6 direction in FIG. 2). The can body W is conveyed in the circumferential direction of each turret 2-6 by this intermittent rotation. Further, the plurality of turrets 2 to 6 are arranged in a state in which the rotation axes of the plurality of turrets 2 to 6 are parallel to each other so that the can body W is transferred and conveyed between all the turrets 2 to 6. Moreover, the rotation directions of the adjacent turrets 2 to 6 are set to be opposite to each other.

The plurality of turrets 2 to 6 include a supply turret 2, a first coating turret 3, a drying turret 4, a second coating turret 5, and a delivery side turret 6.
The supply-side turret 2 takes in the can body W from the previous process (for example, can body forming process) and sequentially transfers it to the first coating turret 3. The supply-side turret 2 includes holding recesses 21 arranged at intervals in the circumferential direction, and adsorbs the outer peripheral surface of the can body W by unillustrated adsorption means (for example, means utilizing air suction). Thus, the can body W is configured to be held in the holding recess 21.

The first coating turret 3 conveys the can body W discharged from the supply side turret 2 and delivers it to the drying turret 4.
As shown in FIGS. 2 and 3, the first coating turret 3 is rotatably provided with a first rotating pedestal 31 that holds the opening end of the can body W by suction. A plurality of first rotating pedestals 31 are arranged at equal intervals in the circumferential direction of the first coating turret 3. Each of the first rotary pedestals 31 is formed in a disk shape and is rotatable around its axis O3. Moreover, the outer peripheral surface 31b of each 1st rotation pedestal 31 is a contact surface which contacts the endless belt 36B of the 1st rotation drive mechanism 36 mentioned later.

Each first rotating pedestal 31 is formed with a fitting protrusion 32 that is fitted inside the opening end of the can body W. The fitting protrusion 32 protrudes in the direction of the axis O <b> 3 of the first rotating pedestal 31 from the placement surface 31 a of the first rotating pedestal 31 placed with the opening end of the can body W in contact with the first rotating pedestal 31. Is formed in a circular shape in a plan view concentric with the axis O3. Although this fitting convex part 32 may be formed in a column shape, for example, it is more preferable to be formed in a truncated cone shape as in the illustrated example. That is, in this embodiment, the outer peripheral surface of the fitting convex part 32 is the guide inclined surface 32b which inclines radially inward as it goes to the protrusion direction front-end | tip.
By placing the can body W on the placement surface 31a of the first rotating pedestal 31 so that the fitting convex portion 32 having the above configuration is fitted inside the opening end of the can body W, The axis O1 can be made to coincide with the axis O3 of the first rotation base 31.

  In addition, each first rotary base 31 is provided with a suction mechanism 33 that holds the opening end of the can body W by suction. The suction mechanism 33 of the present embodiment has a ventilation path 33A that opens to the top surface 32a of the fitting projection 32, and air inside the can body W that is connected to the ventilation path 33A and placed on the first rotary base 31. Suction means 33B such as a blower for suction.

In addition, a bottom outer surface coating mechanism 34 that coats the bottom outer surface of the can body W in a state where the can body W is held on the first rotating pedestal 31 is provided in the middle of the conveyance path of the can body W by the first coating turret 3. It has been. The bottom outer surface coating mechanism 34 of the present embodiment includes an outer surface spray unit 35 that sprays paint onto the bottom outer surface of the can body W.
The outer spray unit 35 is configured to spray paint on the outer surface of the bottom while the intermittent rotation of the first coating turret 3 is stopped. In addition, the outer spray unit 35 is configured to spray the paint on a part of the outer surface of the bottom part, and when spraying the paint, the axis of the first rotating base 31 and the can body W held by the first rotating base 31 are arranged. By rotating around O3 and O1, the entire bottom outer surface can be painted.
The bottom outer surface coating mechanism 34 of the present embodiment includes a plurality of the outer surface spraying portions 35, that is, a first outer surface spraying portion 35 </ b> A that sprays paint on the concave surface W <b> 22 of the can body W, and a taper of the can body W. A second outer surface spraying part 35B for spraying on the surface W23.

Further, on the outer peripheral side of the first coating turret 3, a first rotation drive mechanism 36 that rotates the first rotation base 31 when the bottom outer surface of the can body W is painted by the bottom outer surface coating mechanism 34, and the bottom portion of the can body W A first rotation stop mechanism 37 is provided to stop the rotation of the first rotation base 31 after the outer surface is coated and before the can body W is discharged from the first coating turret 3.
The first rotational drive mechanism 36 rotationally drives one of a plurality (three) of rotatable pulleys 36A, an endless belt (rotating member) 36B wound around the plurality of pulleys, and the plurality of pulleys 36A. A motor (not shown). The endless belt 36 </ b> B only needs to be in contact with the first rotating pedestal 31 disposed at a position corresponding to at least the bottom outer surface coating mechanism 34, but the position where the can body W is carried into the first coating turret 3 (supply side turret). 2), the position where the can body W is discharged from the first coating turret 3 (the position where the can body W is delivered to the drying turret 4), and a first rotation stop mechanism 37 which will be described later. If the interference does not occur, for example, as shown in FIG. 2, the bottom outer surface coating mechanism 34 may contact the first rotation pedestal 31 positioned on the front side or the rear side in the rotation direction of the first coating turret 3.

In the first rotation drive mechanism 36, the rotation of the endless belt 36 </ b> B due to the driving force of the motor is transmitted to the first rotation pedestal 31 that contacts the first rotation pedestal 31, and the can held by the first rotation pedestal 31. W can be rotated around its axis O3, O1.
The endless belt 36B may rotate in any direction. For example, the moving direction of the portion of the endless belt 36B that contacts the first rotating pedestal 31 is the first rotating pedestal accompanying the intermittent rotation of the first coating turret 3. It is more preferable to rotate in the direction indicated by the arrow R7 in FIG. In this case, when the 1st rotation base 31 moves with the intermittent rotation of the 1st coating turret 3, it can prevent that the rotation of the 1st rotation base 31 is accelerated too much. That is, the rotation speed of the first rotation base 31 can be stabilized.

The first rotation stopping mechanism 37 includes a plurality of (three) pulleys 37A that can rotate, and an endless belt (rotating member) 37B wound around the plurality of pulleys. The first rotation stopping mechanism 37 includes braking force applying means (not shown) that applies a braking force to the rotating endless belt 37B when the rotating first rotating base 31 comes into contact with the endless belt 37B.
The endless belt 37B is positioned between the bottom outer surface coating mechanism 34 and the position where the can body W is discharged from the first coating turret 3 (the position where the can body W is transferred to the drying turret 4). It contacts the outer peripheral surface 31b. In the illustrated example, the outer peripheral surface of the first rotation base 31 positioned on the front side in the rotation direction of the first coating turret 3 relative to the first rotation drive mechanism 36 so that the endless belt 37B does not interfere with the first rotation drive mechanism 36. It contacts 31b. In the illustrated example, the endless belt 37 </ b> B is also in contact with the first rotary pedestal 31 positioned at the delivery position to the drying turret 4, but is not limited thereto.

For example, the braking force applying means may be configured to apply a braking force to the pulley 36A that is attached to at least one of the plurality of pulleys 36A and rotates using magnetic torque. In this configuration, when the rotating first rotating base 31 comes into contact with the endless belt 36B, a braking force can be applied to the pulley 36A that rotates with the rotation of the endless belt 36B.
In the first rotation stopping mechanism 37, when the outer peripheral surface 31b of the rotating first rotating pedestal 31 comes into contact with the endless belt 36B, friction is generated between the endless belt 36B and the first rotating pedestal 31. As a result, the rotation speed of the first rotation base 31 is reduced. The endless belt 36B is rotationally driven by the rotating first rotating pedestal 31, and the rotation of the endless belt 36B is stopped by the braking force applying means.

The drying turret 4 conveys the can body W discharged from the first coating turret 3 while passing it to the second coating turret 5. The drying turret 4 includes holding recesses 41 arranged at intervals in the circumferential direction, like the supply-side turret 2, and the outer peripheral surface of the can body W is removed by suction means (for example, means using air suction). By adsorbing, the can body W is configured to be held in the holding recess 41. In other words, the bottom outer surface of the can body W painted by the bottom outer surface coating mechanism 34 does not contact anywhere.
The drying turret 4 is provided to promote drying of the paint applied to the outer surface of the bottom of the can body W while the can body W is being conveyed. Accordingly, in the illustrated coating apparatus 1, only one drying turret 4 is provided, but a plurality of drying turrets may be provided, for example. In the drying turret 4, the paint applied to the outer surface of the bottom of the can body W does not have to be completely dried. For example, it may be dried to the extent that the second coating turret 5 described below does not have an adverse effect.

The second coating turret 5 conveys the can body W discharged from the drying turret 4 and delivers it to the delivery side turret 6.
As shown in FIGS. 2 and 4, the second coating turret 5 is rotatably provided with a second rotating pedestal 51 that holds the can bottom W <b> 2 of the can body W by suction. A plurality of second rotating pedestals 51 are arranged at equal intervals in the circumferential direction of the second coating turret 5. Each of the second rotary pedestals 51 is formed in a disk shape and is rotatable around its axis O5. Moreover, the outer peripheral surface 51b of each 2nd rotation pedestal 51 is a contact surface which contacts the endless belt 56B of the 2nd rotation drive mechanism 56 mentioned later.

Each second rotary pedestal 51 is formed with a positioning groove 52 into which the annular convex portion W21 of the can body W is inserted. The positioning groove 52 is formed to be recessed from the placement surface 51a of the second rotary pedestal 51 on which the can bottom W2 of the can body W is placed, and is formed in an annular shape in plan view around the axis O5 of the second rotary pedestal 51. Has been. The positioning groove 52 is, for example, a V groove or a trapezoidal groove. By placing the can body W on the placing surface 51 a of the second rotating pedestal 51 so that the annular convex portion W 21 of the can body W enters the positioning groove 52, the axis O 1 of the can body W is set to the second rotating pedestal 51. Can coincide with the axis O5.
In the state where the can body W is mounted on the mounting surface 51a of the second rotary pedestal 51 as described above, the mounting surface 51a of the second rotary pedestal 51 and the concave surface W22 of the can body W A partitioned space V1 is defined.

  Each second rotary base 51 is provided with a suction mechanism 53 that sucks and holds the can bottom W2 of the can body W. The suction mechanism 53 of the present embodiment is connected to the ventilation path 53A that opens to the inner peripheral side region of the positioning groove 52 in the placement surface 51a of the second rotation pedestal 51, and the second rotation pedestal 51 connected to the ventilation path 53A. And a suction means 53B such as a blower for sucking the air in the space V1 between the main body and the can body W mounted thereon.

In addition, an inner surface coating mechanism 54 that coats the inner surface of the can body W in a state where the can body W is held by the second rotating pedestal 51 is provided in the middle of the conveyance path of the can body W by the second coating turret 5. Yes. The inner surface coating mechanism 54 of the present embodiment includes an inner surface spray unit 55 that sprays the paint onto the inner surface of the can body W.
The inner surface spraying portion 55 is configured to spray the paint onto the inner surface of the can body W while the intermittent rotation of the second coating turret 5 is stopped. The inner surface spraying portion 55 is configured to spray paint onto a part of the inner surface of the can body W in the circumferential direction. When the paint is sprayed, the second rotating pedestal 51 and the can body W held by the second rotating base 51 are used. Is rotated about its axis O5, O1 so that the entire inner surface of the can body W can be painted.
The inner surface coating mechanism 54 of the present embodiment includes a plurality of the inner surface spraying portions 55, that is, a first inner surface spraying portion 55A that sprays paint onto the inner peripheral surface of the can body portion W1, and a bottom surface of the can bottom portion W2. And a second inner surface spraying portion 55B for spraying on.

Further, on the outer peripheral side of the second coating turret 5, a second rotation drive mechanism 56 that rotates the second rotating pedestal 51 during the coating of the inner surface of the can body W by the inner surface coating mechanism 54, and the coating of the inner surface of the can body W A second rotation stop mechanism 57 that stops the rotation of the second rotary base 51 after the can body W is discharged from the second coating turret 5 later is provided.
Similarly to the first rotation drive mechanism 36, the second rotation drive mechanism 56 includes a plurality of (three) pulleys 56A, an endless belt (rotary member) 56B wound around the plurality of pulleys 56A, and a plurality of pulleys 56A. A motor (not shown) that rotationally drives one of them. The endless belt 56B may be in contact with at least the second rotary pedestal 51 disposed at a position corresponding to the inner surface coating mechanism 54, but the position where the can body W is carried into the second coating turret 5 (the drying turret 4). The can body W from the second coating turret 5, the position where the can body W is discharged from the second coating turret 5, and the second rotation stop mechanism 57 described later. If not, for example, as shown in FIG. 2, the second coating turret 5 may be in contact with the position of the inner surface coating mechanism 54 on the front or rear side in the rotational direction of the second coating turret 5.

In the second rotation drive mechanism 56, the rotation of the endless belt 56B due to the driving force of the motor is transmitted to the second rotation pedestal 51 in contact with the second rotation pedestal 51, and the can body held on the second rotation pedestal 51 W can be rotated about its axes O5 and O1.
The endless belt 56B may rotate in any direction. For example, the moving direction of the portion of the endless belt 56B that contacts the second rotating pedestal 51 is the second rotating pedestal accompanying the intermittent rotation of the second coating turret 5. It is more preferable to rotate in the direction indicated by arrow R8 in FIG. In this case, it is possible to prevent the rotation of the second rotating pedestal 51 from being excessively accelerated when the second rotating pedestal 51 moves along with the intermittent rotation of the second coating turret 5. That is, the rotation speed of the second rotary base 51 can be stabilized.

The second rotation stop mechanism 57 is configured in the same manner as the first rotation stop mechanism 37. That is, the second rotation stop mechanism 57 includes a plurality (three) of pulleys 57A and an endless belt (rotating member) 57B wound around the plurality of pulleys 57A. The second rotation stopping mechanism 57 includes a braking force applying means (not shown) that applies a braking force to the rotating endless belt 57B when the rotating second rotating base 51 comes into contact with the endless belt 57B.
The endless belt 57B is provided between the inner surface coating mechanism 54 and the second rotating pedestal 51 located between the position where the can body W is discharged from the second coating turret 5 (the position where the can body W is delivered to the delivery side turret 6). It contacts the outer peripheral surface 51b. In the illustrated example, the outer peripheral surface of the second rotary pedestal 51 located on the front side in the rotation direction of the second coating turret 5 with respect to the second rotary drive mechanism 56 so that the endless belt 57B does not interfere with the second rotary drive mechanism 56. 51b. In the illustrated example, the endless belt 57B is also in contact with the second rotary pedestal 51 located at the delivery position to the delivery-side turret 6, but the present invention is not limited to this.

For example, the braking force applying means may be configured to apply a braking force to the pulley 57A that is attached to at least one of the plurality of pulleys 57A and rotates using magnetic torque. In this configuration, when the rotating second rotating pedestal 51 comes into contact with the endless belt 57B, a braking force can be applied to the pulley 57A that rotates with the rotation of the endless belt 57B.
In the second rotation stopping mechanism 57, when the outer peripheral surface 51b of the rotating second rotating pedestal 51 comes into contact with the endless belt 57B, friction is generated between the endless belt 57B and the second rotating pedestal 51. As a result, the rotational speed of the second rotary base 51 is reduced. The endless belt 57B is rotationally driven by the rotating second rotary pedestal 51. The rotation of the endless belt 57B is stopped by the braking force applying means.

  The delivery-side turret 6 conveys the can body W discharged from the second coating turret 5 and sends the can body W to a subsequent process (for example, an inspection process step for the can body W). Similarly to the supply side turret 2 and the drying turret 4, the delivery side turret 6 also has holding recesses 61 arranged at intervals in the circumferential direction, and can be moved by suction means (for example, means using air suction). By adsorbing the outer peripheral surface of the body W, the can body W is configured to be held in the holding recess 61.

  In the coating apparatus 1 configured as described above, the can bodies W are adsorbed and held in the turrets 2 to 6, but the turret on the downstream side (for example, the first turret 3) and the downstream turret (for example, the drying turret 4). At the position where the can body W is handed over, the suction holding of the can body W by the upstream turret is released.

Next, the coating method which coats the bottom part outer surface and inner surface of the can body W using the coating apparatus 1 comprised as mentioned above is demonstrated.
First, the can body W taken into the supply side turret 2 from the previous step is conveyed in the circumferential direction of the supply side turret 2 by the intermittent rotation of the supply side turret 2 and is positioned adjacent to the first coating turret 3 (delivery position). ) Is transferred to the first rotating pedestal 31 of the first coating turret 3. When the can body W is delivered to the first rotating pedestal 31, the opening end of the can body W is sucked and held on the first rotating pedestal 31 by the suction mechanism 33. At this time, the fitting convex portion 32 of the first rotating pedestal 31 is fitted inside the opening end of the can body W. As a result, the axis O1 of the can body W coincides with the axis O3 of the first rotary base 31.

The can body W held on the first rotating pedestal 31 as described above is conveyed to the position where the bottom outer surface coating mechanism 34 is provided by the intermittent rotation of the first coating turret 3. When the can body W reaches the position where the bottom outer surface coating mechanism 34 is provided, the bottom outer surface coating mechanism 34 is rotated while the first rotation pedestal 31 and the can body W are rotated around the axes O3 and O1 by the first rotation drive mechanism 36. To paint the bottom outer surface of the can body W (bottom outer surface painting step). This bottom outer surface coating step is performed in a state where the intermittent rotation of the first coating turret 3 is stopped.
In the present embodiment, before the can body W reaches the position where the bottom outer surface coating mechanism 34 is provided, the first rotation pedestal 31 and the can body W are rotated around the axes O3 and O1 by the first rotation drive mechanism 36 in advance. Therefore, immediately after the can body W reaches the position where the bottom outer surface coating mechanism 34 is provided and the intermittent rotation of the first coating turret 3 is stopped, the bottom outer surface coating step can be performed.

After the bottom outer surface coating step, the can body W is conveyed to a position (delivery position) adjacent to the drying turret 4 by the intermittent rotation of the first coating turret 3. When this conveyance is started, the first rotary base 31 and the can body W continue to rotate due to inertial force even if the first rotary base 31 does not receive the driving force of the first rotary drive mechanism 36. The rotation of the first rotation pedestal 31 and the can body W is stopped by the first rotation stop mechanism 37 until reaching the delivery position to the drying turret 4.
The can body W that has reached the delivery position to the drying turret 4 is delivered from the first rotating pedestal 31 to the holding recess 41 of the drying turret 4. At the time of this delivery, the suction holding of the opening end of the can body W with respect to the first rotating pedestal 31 is released, and the outer peripheral surface of the can body W is made the inner surface of the holding recess 41 by the suction means of the drying turret 4. By adsorbing, the can body W is held in the holding recess 41.

The can body W held in the holding recess 41 is conveyed in the circumferential direction of the drying turret 4 by the intermittent rotation of the drying turret 4. By this conveyance, a drying process for promoting drying of the paint applied to the outer surface of the bottom of the can body W is performed.
Then, the can body W conveyed by the drying turret 4 is delivered to the second rotating pedestal 51 of the second coating turret 5 at a position (delivery position) adjacent to the second coating turret 5. When the can body W is delivered to the second rotary pedestal 51, the suction of the outer peripheral surface of the can body W to the inner surface of the holding recess 41 is released, and the can bottom W2 of the can body W is The two-rotation pedestal 51 is held by suction. At this time, the annular convex portion W 21 of the can body W enters the positioning groove 52 of the second rotary base 51. Thereby, the axis O1 of the can body W coincides with the axis O5 of the second rotary base 51.

The can body W held on the second rotating pedestal 51 as described above is conveyed to the position where the inner surface coating mechanism 54 is provided by the intermittent rotation of the second coating turret 5. When the can body W reaches the position where the inner surface coating mechanism 54 is provided, the inner surface coating mechanism 54 rotates the second rotating pedestal 51 and the can body W around the axes O5 and O1 by the second rotation driving mechanism 56. The inner surface of the body W is painted (inner surface painting process). This inner surface coating process is performed in a state where the intermittent rotation of the second coating turret 5 is stopped.
In this embodiment, before the can body W reaches the position where the inner surface coating mechanism 54 is provided, the second rotary drive mechanism 56 rotates the second rotating base 51 and the can body W around the axes O5 and O1 in advance. Therefore, the inner surface coating process can be performed immediately after the can body W reaches the position where the inner surface coating mechanism 54 is provided and the intermittent rotation of the second coating turret 5 is stopped.

After the inner surface coating process, the can body W is conveyed to a position (delivery position) adjacent to the delivery side turret 6 by the intermittent rotation of the first coating turret 3. When this transport is started, the second rotary pedestal 51 and the can body W continue to rotate due to inertial force even if the second rotary pedestal 51 does not receive the driving force of the second rotary drive mechanism 56. The rotation of the two-rotation pedestal 51 and the can body W is stopped by the second rotation stop mechanism 57 until reaching the delivery position to the delivery-side turret 6.
The can body W that has reached the delivery position to the delivery-side turret 6 is delivered from the second rotary base 51 to the holding recess 61 of the delivery-side turret 6. At the time of this delivery, the suction holding of the can bottom W2 of the can body W with respect to the second rotary pedestal 51 is released, and the outer peripheral surface of the can body W is made the inner surface of the holding recess 61 by the suction means of the delivery side turret 6. By adsorbing, the can body W is held in the holding recess.

  The can body W held in the holding recess 61 is conveyed in the circumferential direction of the delivery side turret 6 so as to be separated from the delivery position with the second coating turret 5 by the intermittent rotation of the delivery side turret 6, and then in the subsequent stage. Sent to the process. Thus, the coating method of the present embodiment is completed.

As described above, according to the coating apparatus 1 and the coating method according to the present embodiment, both the case where the bottom outer surface of the can body W is painted and the case where the inner surface of the can body W is painted are first, By rotating and driving the first and second rotary bases 31 and 51 by the second rotary drive mechanisms 36 and 56, the can body W can be rotated around the axis O1 together with the first and second rotary bases 31 and 51. . In other words, the can body W can be rotated around the axis O1 without bringing the driving rotary member and the supporting roller into contact with the outer peripheral surface of the can body W as in the prior art. Therefore, the bottom outer surface and the inner surface of the can body W can be painted without damaging the can body W (particularly the outer peripheral surface).
Moreover, since the inner surface of the can body W is painted after the bottom outer surface of the can body W is painted, it is possible to prevent the paint on the inner surface of the can body W from being peeled off.

  Furthermore, according to the coating apparatus 1 and the coating method of the present embodiment, the drying turret 4 (drying process) promotes the drying of the paint on the outer surface of the bottom of the can body W. It is possible to prevent the paint on the outer surface of the bottom from being peeled off when being sucked and held on the two-turn pedestal 51.

  Moreover, according to the coating apparatus 1 of this embodiment, since the fitting convex part 32 and the positioning groove | channel 52 are formed in the 1st, 2nd rotation pedestals 31,51, the axis line O1 of the can body W is easily set. Since the first and second rotating pedestals 31 and 51 can be made to coincide with the axes O3 and O5, the bottom outer surface coating mechanism 34 and the inner surface coating mechanism 54 can uniformly coat the inner surface of the can body W.

In particular, since the first rotating pedestal 31 is formed with a fitting projection 32 that is fitted into the opening end of the can body W, the opening end of the can body W can be formed by forming the can body W by deep drawing. Even if the shape of the portion varies, the axis O1 of the can body W can be easily matched with the axis O3 of the first rotary base 31. Furthermore, since the guide convex surface 32b is formed in the fitting convex part 32 of this embodiment, it becomes possible to fit the fitting convex part 32 in the opening edge part of the can body W easily.
Moreover, when this fitting convex part 32 is inserted in the opening edge part of the can body W, although a part of fitting convex part 32 contacts the inner surface of the can body W, in this embodiment, as mentioned above Since the inner surface of the can body W is painted after the outer surface of the bottom of the can body W is coated, it is possible to prevent the paint on the inner surface of the can body W from being peeled off by the fitting convex portion 32.

Furthermore, according to the coating apparatus 1 of the present embodiment, the can body W is discharged from the first and second coating turrets 3 and 5 and transferred to the drying turret 4 and the delivery side turret 6. Since the rotation of the body W is stopped together with the first and second rotation pedestals 31 and 51 by the first and second rotation stopping mechanisms 37 and 57, the outer peripheral surface of the can body W is formed by the drying turret 4 and the delivery side turret 6. When the can body W is delivered by being sucked and held on the inner surfaces of the holding recesses 41 and 61, the outer peripheral surface of the can body W can be prevented from being damaged by being rubbed against the inner surfaces of the holding recesses 41 and 61. .
Further, the first and second rotation pedestals 31 where the endless belts 37 </ b> B and 57 </ b> B of the first and second rotation stop mechanisms 37 and 57 are located at the delivery position of the can body W to the drying turret 4 and the delivery-side turret 6. , 51 can be held in a state in which the rotation of the first and second rotary pedestals 31, 51 is reliably stopped. Therefore, the outer peripheral surface of the can body W can be reliably prevented from being damaged when the can body W is transferred to the insertion turret 4 and the delivery side turret 6.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention.
For example, when there is no variation in the shape of the opening end portion of the molded can body W, the fitting convex portion 32 may not be formed on the first rotary base 31. In this case, for example, as in the case of the second rotary pedestal 51, a positioning groove that allows the opening end of the can body W to enter the rotary pedestal 31 may be formed.

  Moreover, the 1st, 2nd rotation drive mechanisms 36 and 56 which rotationally drive the 1st, 2nd rotation pedestals 31 and 51 are restricted to being provided with pulleys 36A and 56A and endless belts 36B and 56B as in the above embodiment. And at least a rotating member that contacts the outer peripheral surfaces 31b and 51b of the first and second rotating pedestals 31 and 51 to rotate the first and second rotating pedestals 31 and 51, and a motor that rotationally drives the rotating members. It only has to be. In addition, a wheel is mentioned as a rotation member for the 1st, 2nd rotational drive mechanisms 36 and 56 except the endless belts 36B and 56B, for example.

  Further, the first and second rotation stopping mechanisms 37 and 57 for stopping the rotation of the first and second rotating pedestals 31 and 51 include pulleys 37A and 57A and endless belts 37B and 57B as in the above embodiment. Not limited to this, it is only necessary to include a rotating member that contacts at least the outer peripheral surfaces 31b and 51b of the first and second rotating pedestals 31 and 51, and a braking force applying means that applies a braking force to the rotating rotating member. . In addition, as a rotation member for the 1st, 2nd rotation stop mechanisms 37 and 57 except the endless belts 37B and 57B, a wheel is mentioned, for example.

Furthermore, in the said embodiment, although the turret 4 for drying is provided between the 1st coating turret 3 and the 2nd coating turret 5, it does not need to provide, for example. In this case, the can body W discharged from the first coating turret 3 is directly delivered to the second coating turret 5.
Further, the supply-side turret 2 provided in the previous stage of the first coating turret 3 and the delivery-side turret 6 provided in the subsequent stage of the second coating turret 5 do not have to be provided.

DESCRIPTION OF SYMBOLS 1 Coating apparatus 3 The 1st coating turret 31 The 1st rotation pedestal 32 The fitting convex part 34 The bottom part outer surface coating mechanism 36 The 1st rotation drive mechanism 37 The 1st rotation stop mechanism 4 The drying turret 5 The 2nd coating turret 51 The 2nd rotation pedestal 52 Positioning groove 54 Inner surface coating mechanism 56 Second rotation drive mechanism 57 Second rotation stop mechanism W Can body W1 Can body part W2 Can bottom part W21 Annular convex part W22 Concave surface (bottom part outer surface)
W23 Tapered surface (outer surface of bottom)
O1 Axis O3 of can body W3 Axis O5 of first rotation pedestal 31 Axis axis of second rotation pedestal 51

Claims (6)

A painting device for painting the bottom outer surface and the inner surface of a can body formed into a bottomed cylindrical shape,
A first coating turret for conveying the can body;
A first rotating pedestal that is rotatably provided on the first coating turret and holds the opening end of the can body by suction;
A bottom outer surface coating mechanism that coats the bottom outer surface of the can body in a state where the can body is held on the first rotating pedestal;
A second paint turret for conveying the can discharged from the first paint turret;
A second rotating pedestal that is rotatably provided on the second coating turret and holds the bottom of the can by suction;
An inner surface coating mechanism that coats the inner surface of the can body in a state where the can body is held on the second rotating base;
A coating apparatus comprising: A drying turret is provided that conveys the can discharged from the first coating turret.
The coating apparatus according to claim 1, wherein the can body conveyed in the drying turret is delivered to the second coating turret.   The coating apparatus according to claim 1, wherein a fitting convex portion that is fitted inside the opening end portion of the can body is formed on the first rotating base. On the outer surface of the bottom of the can body, an annular convex portion having an annular shape in plan view around the axis of the can body is formed,
The positioning groove for forming the annular convex portion is formed in the second rotary pedestal so as to have an annular shape in a plan view centered on the axis of the second rotary pedestal. Item 4. The coating apparatus according to any one of items 3 to 3. A first rotation stop mechanism for stopping the rotation of the first rotating pedestal after the bottom outer surface is coated by the bottom outer surface coating mechanism and before the can body is discharged from the first coating turret;
A second rotation stop mechanism for stopping the rotation of the second rotary pedestal after the inner surface is coated by the inner surface coating mechanism and before the can body is discharged from the second coating turret. The coating apparatus as described in any one of Claims 1-4 characterized by the above-mentioned. A painting method for painting the bottom outer surface and the inner surface of a can body formed into a bottomed cylindrical shape,
The bottom outer surface of the can body is painted while rotating the first rotating pedestal and the can body around the axis thereof while the opening end of the can body is sucked and held by the first rotating pedestal that is rotatable. Bottom outer surface painting process,
An inner surface coating step of coating the inner surface of the can body while rotating the second rotating base and the can body around an axis thereof in a state where the bottom portion of the can body is sucked and held by a second rotating base made rotatable. And a coating method characterized by performing in order.

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