JP2002224769A - Outer surface treatment apparatus and outer surface treatment method for can body - Google Patents

Abstract

(57) [Problem] To contact a holding member and a can body when removing the holding member from the inside of the can body after inserting the holding member into a can body and performing predetermined processing. Work around. SOLUTION: An opening end 50 of a can body 1 is arranged so as to face a distal end side of a shaft-shaped mandrel 6 traveling on a predetermined track, and the can body 1 and the mandrel 6 are opposed to each other in a center line direction. After the can body 1 is fitted and held on the mandrel 6 by moving, the outer peripheral surface of the can body 1 is subjected to a predetermined process, and then the can body 1 and the mandrel 6 are relatively moved in the axial direction, In the apparatus for treating the outer surface of a can body, which withdraws the can body 1 from the mandrel 6, an end 5 opposite to the open end 50 of the can body 1.
Holder magnet table 44 for sucking and holding 1
The magnet table 44 includes a magnet 46 and a plate 47 for aligning the center line Q1 of the can body 1 with the center line B1 of the mandrel 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and a method for performing a predetermined outer surface treatment on an outer surface of a can body, for example, a printing process, application of a paint, and attachment of a film.

[0002]

2. Description of the Related Art Conventionally, in a can manufacturing process, a predetermined outer surface treatment is applied to an outer surface of a can body, for example, a printing process, application of a paint,
As a method of applying a film, for example, a metal plate is formed into a cylindrical shape and both ends are joined to produce a can body, or a metal plate is formed by drawing, drawing and ironing, etc. A method is known in which after the body is manufactured, a predetermined outer surface treatment is performed on the outer surface of the can body.

[0003] An example of the above-mentioned method and its apparatus is described in Japanese Patent Application Laid-Open No. 3-230940. In this publication, a plurality of mandrels are provided at equal intervals on a turntable, and an electromagnetic induction coil is provided inside each mandrel. In addition, a holding member is provided that is movable relative to the mandrel in the axial direction, and the holding member has a suction hole that is communicated with a vacuum source. Further, an adhesive device having an adhesive roll is provided near the turntable.

In the method and apparatus described in the above publication, first, the bottom of a can body of a two-piece can, such as a drawn iron can, an extruded can, or the like, is suctioned by the vacuum suction force of a holding member. The can body is held. Next, the holding member moves in the axial direction of the can body, the mandrel is inserted into the can body, and the mandrel and the can body are positioned in the axial direction. In addition, when power is supplied to the electromagnetic induction coil, the can body held by the mandrel is heated. Thereafter, the film sheet wound around the adhesive roll is adhered to the outer surface of the can body via the adhesive layer, and the film sheet is pressed at a predetermined pressure,
A film sheet is adhered to the outer surface of the can body. Thus, the holding member holding the can body to which the film sheet is adhered moves in the axial direction of the can body, and the mandrel is extracted from the inside of the can body.

[0005]

In the invention described in the above publication, since the mandrel and the can body are not positioned in a direction perpendicular to the center line, the holding member is moved in the direction of the center line of the can body. When the mandrel is inserted into the inside of the can body by moving the holding member, and after adhering the film to the outer surface of the can body, the holding member is moved in the direction of the center line of the can body to remove the mandrel from the inside of the can body. When extracting, the mandrel and the inner surface of the can body come into contact with each other and may be rubbed and the inner surface of the can body may be damaged. Further, on the inner surface of the can body as described above, a thermoplastic resin is used for the purpose of preventing direct contact between the contents to be filled in the can and the inner surface of the can body, and preventing corrosion of the inner surface of the can body. Although the inner surface coating layer formed of a film or the like is formed, when the apparatus and method described in the above publication are used for the outer surface treatment of a can body having an inner surface coating layer, a mandrel and an inner surface coating layer Contact, and the inner surface coating layer may be broken.

The present invention has been made in view of the above-mentioned technical problem, and has a structure in which a holding member is fitted and held in a can body and a holding member is removed from the inside of the can body. It is an object of the present invention to provide a can body outer surface treatment apparatus and an outer surface treatment method that can avoid contact between the can body and the inner surface of the can body.

[0007]

In order to achieve the above-mentioned object, the invention according to the first aspect of the present invention is directed to a method in which an open end of a can body is connected to a tip end side of a shaft-like holding member running on a predetermined track. Along with disposing the can body and the holding member relative to each other in the direction of the center line thereof, the can body is fitted and held on the holding member, and the can body is held by the holding member. After performing a predetermined process on the outer peripheral surface of the can body in the fitted and held state, the can body and the holding member are relatively moved in the axial direction to remove the can body from the holding member. In the external surface treatment apparatus, a holding tool for sucking and holding an end opposite to the open end of the can body is disposed so as to face a front end side of the holding member, and the holding tool is provided on the can body. Self-aligning mechanism that matches the center line of the holding member with the center line of the holding member And it is characterized in that it comprises.

According to the first aspect of the present invention, the can body and the holding member are relatively moved in the center line direction with their center lines being self-aligned. The contact between the inner surface of the can body and the holding member is avoided when fitting and when removing the can body from the holding member.

According to a second aspect of the present invention, in addition to the configuration of the first aspect, when the self-centering mechanism performs a predetermined process on an outer peripheral surface of the can body, the can body and the holding member are separated from each other. It has a function of allowing relative movement in a direction perpendicular to the center line.

According to the second aspect of the present invention, in addition to the same effect as that of the first aspect of the present invention, when performing predetermined processing on the outer peripheral surface of the can body, the can body and the holding member are aligned with the center line. Relative movement in a direction perpendicular to the direction, the inner surface of the can body and the holding member come into line contact.

According to a third aspect of the present invention, in addition to the configuration of the first or second aspect, the self-aligning mechanism is attached to the holder and has the same circumference centered on a center line of the holding member. It is characterized by comprising a plurality of magnets arranged above.

According to the third aspect of the present invention, in addition to the same effect as the first or second aspect of the present invention, the balance of the magnetic field formed by the plurality of magnets causes the can body to move in the direction orthogonal to the center line. In addition to being automatically positioned, when performing predetermined processing on the outer surface of the can body, the can body can move in a direction perpendicular to its center line against magnetic attraction.

According to a fourth aspect of the present invention, in addition to any one of the first to third aspects, the outer diameter of the holding member is smaller by 2.0 to 4.0 mm than the inner diameter of the can body. It is assumed that.

According to the fourth aspect of the present invention, in addition to the same effects as those of the first to third aspects of the present invention, the contact between the inner surface of the can body and the holding member can be reliably prevented, and the outer surface of the can body can be prevented. When a predetermined process is performed on the substrate, the impact of the contact between the inner surface of the can body and the holding member is reduced.

According to a fifth aspect of the present invention, the open end of the can body is disposed so as to face the distal end side of a shaft-shaped holding member running on a predetermined track, and the can body and the holding member are connected to each other. While being relatively moved in the center line direction, the can body is fitted and held by the holding member, and a predetermined process is performed on the outer peripheral surface of the can body while the can body is fitted and held by the holding member. After the application, the can body and the holding member are relatively moved in the axial direction to remove the can body from the holding member. In the method for treating the outer surface of the can body, the center line of the can body and the center of the holding member are provided. The can body and the holding member are relatively moved in the direction of the center line in a state where the lines coincide with each other.

According to the fifth aspect of the present invention, since the can body and the holding member are relatively moved in the center line direction with their center lines being self-aligned, the can body can be moved relative to the holding member. The contact between the inner surface of the can body and the holding member is avoided when fitting and when removing the can body from the holding member.

According to a sixth aspect of the present invention, in addition to the configuration of the fifth aspect, when the outer peripheral surface of the can body is subjected to a predetermined process, the direction in which the can body and the holding member are orthogonal to the center line is provided. It is characterized in that it can be moved relative to the object.

According to the sixth aspect of the present invention, in addition to the same effect as that of the fifth aspect of the present invention, when performing predetermined processing on the outer peripheral surface of the can body, the can body and the holding member are aligned with the center line. Relative movement in a direction perpendicular to the direction, the inner surface of the can body and the holding member come into line contact.

[0019]

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a partial cross-sectional view showing a main part of an external surface processing apparatus A1 for performing a predetermined process on the external surface of a can body 1, and FIG. 2 is a front view showing the entire configuration of the external surface processing apparatus A1. As the predetermined processing performed on the outer surface of the can body 1, printing, application of an outer film, application of paint, and the like are known. In this embodiment, the outer film is mainly applied to the outer surface of the can body 1. The case of pasting will be described. Further, the can body 1 is a three-piece can such as a welding can or an adhesive can, a two-piece can such as a drawn can, a deep drawn can, a drawn ironed can, or an impact can, and a bottle having a mouth and neck to be screwed with a screw cap. Although the present invention may be applied to any one of mold cans, this embodiment mainly describes a can body 1 used for a three-piece can.

That is, the can body 1 is formed in a cylindrical shape,
Both ends are open. The metal plate used as the material of the can body 1 may be either a magnetic material or a non-magnetic material. As the non-magnetic material, for example, an aluminum plate or an aluminum alloy plate can be used. Also,
As the magnetic material, surface-treated steel sheets such as tin-free steel, tinplate, ultra-thin tin-plated steel sheets, chrome-plated steel sheets, aluminum-plated steel sheets, nickel-plated steel sheets, and various other alloy-plated steel sheets can be used. In this embodiment, a case where a magnetic material is mainly used among the above metal plates will be described.

An inner surface coating layer (not shown) is formed on the inner surface side of the can body 1. As a method of forming the inner surface coating layer on the inner surface side of the can body 1, a method of applying a paint to a steel plate before forming the can body, which is an inner surface side of the can body 1,
There is a method in which a thermoplastic resin film is attached to a steel sheet before forming the can body, which is an inner surface side of the can body 1. When a paint is applied to the inner surface of the can body 1, it is desirable to use a curable synthetic resin such as a polyester-based or phenol-based paint, particularly a thermosetting synthetic resin. In the case of a two-piece can body, a paint may be applied to the inner surface of the body after the can body is formed.

On the other hand, when a thermoplastic resin film is adhered to the inner surface of the can body 1, the thermoplastic resin film may be a homopolyester resin such as polyethylene terephthalate resin or polybutylene terephthalate resin. Transparent polymer resin alone selected from resin, copolymerized polyester resin consisting of copolymerization of polyethylene terephthalate and isophthalate acid, polypropylene resin, polycarbonate resin, polystyrene resin, modified polyolefin resin, vinyl chloride resin, etc. Alternatively, a thermoplastic resin film composed of a mixture of two or more resins or a composite of the above resins is used. The inner diameter of the can body 1 can be set in the range of 52.4 to 52.5 mm. Also, the open end 50 of the can body 1
Even when the ellipse is not a perfect circle but an ellipse, the length of the minor axis of the ellipse can be set to 51.0 mm or more.

The external surface processing apparatus A1 has a rotary shaft 2 rotated by a driving force source (not shown) such as a motor. The rotating shaft 2 is rotatably held in a horizontal state by bearings 4B attached to cylindrical members 3A, 4A fixed to the frames 3, 4. Further, a rotating body 5 is attached to the rotating shaft 2, and the rotating shaft 2 and the rotating body 5 rotate integrally and clockwise in FIG. A plurality of shaft holes 5A are formed at predetermined intervals on the outer circumference of the rotating body 5 on a circumference centered on the center line C1 of the rotating shaft 2. The center line D1 of each shaft hole 5A and the center line of the rotating shaft 2 are set in parallel.

A bearing 5B is attached to each shaft hole 5A, and the shaft 7 is rotatably held by each bearing 5B. That is, each axis 7 has a center line D1
, And when the rotating body 5 rotates, each shaft 7 revolves around the center line C1. Each axis 7
A shaft-shaped, in other words, a column-shaped mandrel 6 is connected to an end on the side opposite to the frame 4 in the above. Each mandrel 6 is fitted inside the can body 1,
This is for holding the can body 1. The center line B1 of each mandrel 6 is set parallel to the center line C1 of the rotating shaft 2, and the center line B1 of the mandrel 6 and the center line D1 of the shaft 7 are eccentric. Therefore, when the shaft 7 rotates, the mandrel 6 revolves around the center line D1 of the shaft 7. The outer diameter of each mandrel 6 can be set within a range of 48.4 to 50.4 mm.
The outer diameter of the mandrel 6 is set to be smaller by 2.0 to 4.0 mm than the inner diameter of the mandrel.

On the other hand, an arm-shaped connecting member 8 is attached to an end of each shaft 7 on the side of the frame 4. A cam follower shaft 9 is connected to each connecting member 8. Center line E of each cam follower shaft 9
1 and the center line C1 of the rotating shaft 2 are set in parallel. The shaft 7, the connecting member 8, and the cam follower shaft 9 having the above-described configuration are connected so as to rotate integrally with each other.

A cam follower 10 is rotatably attached to an end of each cam follower shaft 9 on the frame 4 side. An annular fixing member 11 is attached to the frame 4 around the rotation shaft 2.
Is formed with an annular cam groove 12. Each cam follower 10 is supported so as to be able to follow the guide shape of the cam groove 12.

The cam groove 12 is an annular groove formed outside the center line C1 of the rotary shaft 2, and the radial center line (not shown) of the cam groove 12 is displaced in the radial direction. I have. That is, when the rotating body 5 and the fixed member 11 rotate relative to each other, the cam follower 10 is displaced in the radial direction along the cam groove 12, and the connecting member 8 swings around the shaft 7, and at the same time, the swing of the connecting member 8 Due to the rotation of the shaft 7 accompanying the movement, the mandrel 6 revolves around the shaft 7. That is, the mandrel 6 is displaced in the radial direction of the rotating body 5. The above configuration makes the circular movement trajectory (in other words, the trajectory or revolution trajectory) F1 of the mandrel 6 around the center line C1 shown in FIG. This is a configuration for displacing (meandering) F1 in a radial direction at a part in the circumferential direction.

Further, a rotating turret 19 is mounted between the rotating body 5 and the frame 3 on the rotating shaft 2. The rotating turret 19 is for temporarily holding the can body 1 supplied from the can body supply station G1 before being held by the mandrel 6. A plurality of pockets 20 are formed on the outer peripheral side of the rotary turret 19 to hold the can body 1 with the open end 50 thereof facing the mandrel 6 side, corresponding to the number of each mandrel 6. I have. The movement locus (not shown) of the plurality of pocket portions 20 is set to a perfect circle centered on the center line C1.

Looking at the above movement locus F1, the mandrel heating station K1, the can body supply station G1, the forced heat transfer station H1, the film sticking station J
1. The can body discharging station L1 is arranged in the above order along the circumferential direction. Here, with reference to the mandrel heating station K1, the can body discharging station L1 is located at the most downstream side. An area F6 corresponding to the can body discharge station L1 and the mandrel heating station K1, an area F3 corresponding to the can body supply station G1, and an area F2 corresponding between the can body supply station G1 and the forced heat transfer station H1. And the area F corresponding to the forced heat transfer station H1
5 and the area F corresponding to the film sticking station J1
4, the movement trajectory F1 is formed.

First, the mandrel heating station K1
Is mainly composed of a heating device 13 for high-frequency induction heating, an electric heater, near infrared rays, far infrared rays, and the like. Further, the can body supply station G1 supplies the can body 1 before the outer surface film is stuck to the movement trajectory F1 side. The can body supply station G1 includes an infeed screw 15 having a spiral groove for transferring the can body 1 one by one in a radial direction, and an infeed screw 1
A heating device 14 for heating the can body 1 transferred by 5;
And an infeed turret 17 having a plurality of holding grooves 16 for holding the cans 1 transferred by the infeed screw 15 one by one. The heating device 14 is mainly configured by high-frequency induction heating, an electric heater, near infrared rays, far infrared rays, and the like.

Rotation axis 1 of infield turret 17
8 is arranged horizontally, and the rotating shaft 18 and the rotating shaft 2 are arranged in parallel. This infeed turret 17
Is rotated counterclockwise in FIG. 2 by a drive source (not shown) such as a motor. A guide member (not shown) for preventing the can body 1 from dropping out of the holding groove 16 is provided on the outer peripheral side of the infeed turret 17. The movement trajectory of the holding groove 16 accompanying the rotation of the infeed turret 17 (this movement trajectory is a movement trajectory around the rotation axis 18) and the movement trajectory F1 of the mandrel 6
And the region F3 coincides with the region F3, and this region F3 is disposed upstream of the region F2.

The forced heat transfer station H1 is disposed downstream of the area F2 in the revolving direction of the mandrel 6. The forced heat transfer station H1 includes a belt member 2 that contacts the outer surface of the can body 1 covered with the mandrel 6.
1, a driving pulley 22 and a rotating pulley 23 on which the belt member 21 is stretched, and a tension pulley 24.
And Further, the forced heat transfer station H1 is provided with infrared irradiation means 25 for irradiating the belt member 21 with infrared rays and heating the temperature of the belt surface in contact with the can body 1 to a predetermined temperature. The belt member 21
Has a thickness of 1.3 mm, a width approximately equal to or greater than the height of the can body, and is made of a heat-resistant material such as silicone rubber, fluorine rubber, or nitrile rubber. Rubber.

Next, the film sticking station J1 will be described. The film sticking station J1 is arranged downstream of the forced heat transfer station H1 in the revolving direction of the mandrel 6, and the film sticking station J1 is connected to the sticking drum 26. Is mainly composed. An outer film (not shown) is suction-held on the outer surface of the attaching drum 26 which rotates counterclockwise about the rotation shaft 26A. The movement trajectory F1 is set such that the movement trajectory of the outer peripheral surface of the sticking drum 26 and the movement trajectory F1 of the mandrel 6 associated with the rotation of the rotating shaft 2 coincide with each other in the area F4.
The rotation shaft 26A is disposed outside the first shaft 1. Thus, the displacement of the movement trajectory F1 in the area F4 is
Are set based on the shape of the cam groove 12 in the radial direction. On the outer surface of the sticking drum 26, an outer film (not shown) cut to a predetermined length corresponding to the circumferential length of the can body 1 is held.

The outer surface film is, for example, a thermoplastic resin film, specifically, a homopolyester resin such as polyethylene terephthalate resin or polybutylene terephthalate resin, or a copolymer of polyethylene terephthalate and isophthalate acid. Transparent polymer resin selected by application from among polyolefin resins such as copolymerized polyester resin, polypropylene resin, modified polypropylene resin, polycarbonate resin, polystyrene resin, vinyl chloride resin, polyvinylidene chloride copolymer A thermoplastic resin film composed of a single substance or a composite of the above resins is used. Among them,
It is preferable to use a polyethylene terephthalate resin having heat resistance.

As a printing method for the outer film,
Gravure printing, flexographic printing and the like can be employed, but from the viewpoint of design, gravure printing with clear image quality and high-grade feeling is preferable. As an ink used for printing, a thermosetting urethane resin ink is generally used. A thermosetting adhesive is applied to a surface of the outer film opposite to the printing surface. As the adhesive, for example, polyester-based, polyurethane-based,
Epoxy, polyethylene and the like can be used. The outer film is held by the attaching drum 26 with the surface on which the adhesive is applied facing outward.

A fixed frame 28 surrounding the rotating shaft 2 is arranged between the rotating turret 19 and the frame 3. The rotating shaft 2 is rotatably inserted into the shaft hole 31 of the fixed frame 28 via a bearing 31A. An annular fixing member 29 is attached to the fixing frame 28.
A cam groove 30 is formed on the entire outer periphery of 9. The cam groove 30 is formed in an annular shape around the center line C1, and in a predetermined region in the circumferential direction,
Displaced in the direction of the center line.

More specifically, the cam groove 30 is displaced in the center line direction corresponding to the movement locus F1 of the mandrel 6. That is, in the range corresponding to the area F6 on the upstream side of the area F3 on the movement trajectory F1 of the mandrel 6, the cam groove 30 is located at the leftmost side in FIG.
It is arranged at a position away from the rotating body 5. In the range corresponding to the region F3, the cam groove 30 is displaced to the right in FIG.
The cam groove 30 is arranged at a position closest to the rotating body 5 in a range from 2 to the region F4 via the region F5. In a range corresponding to the downstream end of the region F4, the cam groove 30 is displaced again in a direction away from the rotating body 5, and in a range corresponding to the region F6 set between the region F4 and the region F3, the cam groove 30 is displaced. Is disposed at a position farthest from the rotating body 5. Furthermore, a cam follower 32 is disposed in the cam groove 30, and the cam follower 32 is movable in the cam groove 30 in a circumferential direction and a depth direction of the cam groove 30 (a direction orthogonal to the center line C <b> 1).

A rotating body 33 is mounted between the frame 3 and the fixed frame 28 on the outer periphery of the rotating shaft 2.
The rotating body 33 is configured to rotate integrally with the rotating shaft 2,
On the outer peripheral side of the rotating body 33, a plurality of shaft holes 34 are formed on the same circumference around the center line C1. Each shaft hole 3
The center line M1 of No. 4 is set in parallel with the center line C1. Further, the center line M1 and the center line D1 are arranged on a straight line. The number of the shaft holes 34 corresponds to the number of the mandrels 6. A slide bearing 35 is fixed to each shaft hole 34. Each shaft 36 is held by each sliding bearing 35. The sliding bearing 35 and the shaft 36 are configured to be relatively rotatable and relatively movable in the direction of the center line.

The end of the shaft 36 on the frame 3 side is connected to the cam follower shaft 3 via an arm-shaped connecting member 37.
8 are connected. Center line N1 of cam follower shaft 38
Are set in parallel with the center line C1, and the center line N1 and the center line E1 are arranged on a straight line. Thus, the cam follower shaft 38 is configured to swing about the shaft 36. Connecting member 3 in cam follower shaft 38
A cam follower 39 is attached to the end opposite to 7.

An annular fixing member 40 surrounding the rotating shaft 2 is fixed to the frame 3, and an annular cam groove 41 is formed on a side surface of the fixing member 40 on the rotating body 33 side. The center line (not shown) of the cam groove 41 in the width direction coincides with the center line (not shown) of the cam groove 12 in the width direction on the projection plane in the center line direction of the rotating shaft 2. , The shape of the cam groove 41 and the cam groove 12 are set. The cam follower 39 is disposed in the cam groove 41. The cam follower 39 has the cam groove 4
1, it is movable in the circumferential direction and in the depth direction of the cam groove 41 (direction parallel to the center line C1).

On the other hand, an end of each shaft 36 on the fixed frame 28 side is connected to a shaft 43 via an arm-shaped connecting member 42.
Are connected to each other. The center line P1 and the center line C1 of each axis 43 are set in parallel, and the center line P1 and the center line B1 are set.
And are arranged on a straight line. That is, each shaft 43 is swingable about each shaft 36. At the end of each shaft 43 on the rotating body 5 side, a magnet table 44 is provided. Each magnet table 44 includes a disc-shaped holder 45, a plurality of magnets 46 disposed facing the surface of the holder 45 on the rotating body 5 side,
6 and a plate 47 for covering the surface on the rotating body 5 side. In this embodiment, the magnet 46 is embedded and arranged on the surface of the holder 45 on the side of the rotating body 5 so that only one surface of the columnar magnet 46 is exposed.
The exposed surface of the magnet 46 is covered with a plate 47. Each plate 47 faces an end 51 of the can body 1 held in the pocket 20 or the mandrel 6 on the side opposite to the open end 50.

As shown in FIG. 3, an even number of the plurality of magnets 46 are provided on the same circumference centered on the center lines P1 and B1, and N poles and S poles are alternately arranged in the circumferential direction. Preferably, they are arranged. Each magnet 46 is formed in a cylindrical shape, and the center of each magnet 46 is arranged on the circumference corresponding to the outer diameter of the can body 1. The end surface 47A of the plate 47 on the rotating body 5 side is formed in a flat shape perpendicular to the center line P1, and the flatness of the end surface 47A is set so that the can body 1 can slide in the radial direction along the end surface 47A of the plate 47. , And the material of the plate 47 are selected. As a material of the plate 47, a non-magnetic material, for example, a metal material such as SUS or cemented carbide, glass, plastic, or the like can be used. On the other hand, to each shaft 43, an arm portion 48 is connected to a halfway portion in the longitudinal direction, and the cam follower 32 is attached to a tip of each arm portion 48, respectively.

In the above configuration, when each shaft 43 swings about each shaft 36, each cam follower 32 moves to the center line C.
1 is displaced in the radial direction of the fixed frame 28, that is, in the depth direction of each cam groove 30. Even when each cam follower 32 is displaced in the depth direction of the cam groove 30, each cam follower 32 is displaced in the cam groove. 30 so that the cam groove 3
A depth of 0 (a depth in a direction orthogonal to the center line C1) is set. When the cam follower 32 moves in the direction of the center line P1 along the cam groove 30, the shafts 43 and 36 and the cam follower shaft 38 move in the direction of the center line integrally with each cam follower 32.

Further, based on the position of the cam groove 30 in the center line direction, even if the shaft 36 reciprocates in the center line direction, the connecting members 37 and 42 and the rotating body 33 do not come into contact with each other. Length is set. Also, the shaft 36
The depth (the depth in the center line direction) of the cam groove 41 is set so that the cam follower 39 does not come out of the cam groove 41 even when the and the cam follower shaft 38 reciprocate integrally in the center line direction. .

Next, the operation of the external surface processing apparatus A1 shown in FIGS. 1 and 2, that is, the external surface processing method will be described. First, in the can body supply station G1, the can bodies 1 are conveyed one by one by the infeed screw 14, and after each can body 1 is heated by the heating device 14,
Each can body 1 is held by a holding groove 16 of an infeed turret 17. And the infeed turret 17
With the rotation in the counterclockwise direction, the holding groove 16 moves along an arc-shaped trajectory centered on the rotation shaft 18, and each can body 1 is transferred toward the area F3.

On the other hand, the rotating shaft 2 and the rotating turret 19 rotate integrally, and the pocket portion 20 moves along a locus of a perfect circle around the rotating shaft 2. Therefore, when the can body 1 held by the holding groove 16 enters the region F3, the can body 1 is transferred from the holding groove 16 to the pocket portion 20.

When the rotating shaft 2 rotates clockwise,
Each shaft 7 attached to the rotating body 5 also revolves counterclockwise around the rotating shaft 2. In addition, the cam follower 10 rolls along the cam groove 12 with the rotation of the rotating shaft 2, so that the mandrel 6 swings about the shaft 7. Therefore, each mandrel 6 moves in the circumferential direction and is displaced in the radial direction of the rotating body 5, and consequently, each mandrel 6 moves along an annular movement trajectory F1 shown by a dashed line in FIG. Revolve.

Further, the rotating shaft 2 and the rotating body 33 rotate integrally, and each shaft 36 revolves around the center line C1. Since the cam follower 39 rolls along the cam groove 41 with the rotation of the rotating shaft 2, the shaft 36 rotates by the swing of the cam follower shaft 38, and the shaft 43 swings by the rotation of the shaft 36, The magnet table 44 moves in the circumferential direction and is displaced in the radial direction of the rotating shaft 2. Here, the center line B1 of each mandrel 6 and the center line P1 of each shaft 43 are arranged on a straight line, and the center line D of each shaft 7 is arranged.
1 and the center line M1 of each shaft 36 are arranged on a straight line, and the center line E1 of each cam follower shaft 9 and each cam follower shaft 38
Are arranged on a straight line with the center line N1. Therefore, with the rotation of the rotating shaft 2, each mandrel 6 and each magnet table 44 move synchronously in a state where the circumferential phase and the radial position match.

When the mandrel 6 passes through the mandrel heating station K 1 with the rotation of the rotating shaft 2, the mandrel 6 is heated by the heating device 13 in the range of 130 to 220 ° C. Due to the rotation, the mandrel 6 and the magnet table 44 enter the area F3. Then, based on the shapes of the cam grooves 12 and 41, the mandrel 6 and the magnet table 44 revolve along an arc-shaped locus centered on the rotating shaft 18. That is, the mandrel 6 and the magnet table 44 move inward in the radial direction of the rotating shaft 2. Further, when the mandrel 6 and the magnet table 44 enter the area F2 with the rotation of the rotating shaft 2, the mandrel 6 and the magnet table 44 move along an arc-shaped locus around the rotating shaft 2.

When the magnet table 44 enters the area F2, the shaft 43 and the magnet table 44 are at the position farthest from the mandrel 6 (that is, the standby position) based on the shape of the cam groove 30, and the holding groove 16 Is in a non-contact state with the plate 47 of the magnet table 44, but after the magnet table 44 enters the area F2, the cam groove 30 The shaft 43 and the magnet table 44 move in a direction approaching the mandrel 6 based on the shape in the axial direction. Then, the end surface 47A of the plate 47 and the end 51 of the can body 1 come into contact with each other, and the end portion 51 of the can body 1 is attracted by the magnetic attraction force of each magnet 46.

Here, each magnet 46 has a center line P1, B1
Alternately in the circumferential direction on the same circumference centered on
Even numbers are arranged. In this case, the can 1 is attracted to the center of each magnet 46 by the magnetic force of each magnet 46, and each magnet 46 is arranged so that the N pole and the S pole are alternately arranged. The emitted magnetic flux is the plate 47
And enters the S pole across the upper part of the plate 47, and an electromagnetic induction action, which is an interaction between the magnetic flux and the current induced in the can 1, occurs, and the can 1 is attracted to the center of each magnet 46. Can be As described above, the magnetic force and the electromagnetic induction function act in combination, so that the can body 1
Sliding along 7A, the can body 1 is positioned in its radial direction. In this way, the center line Q1 of the can body 1 and the center line B1 of the mandrel 6 are held in a straight line.

Next, based on the shape of the cam groove 30, the magnet table 44 further moves in a direction approaching the mandrel 6, and the mandrel 6 is inserted into the can body 1. Note that even if the mandrel 6 is fitted inside the can body 1, the tip 52 of the mandrel 6 and the end face 4 of the plate 47
There is no contact with 7A. Then, the mandrel 6 and the magnet table 44 enter the area F5 corresponding to the forced heat transfer station H1. Then, cam groove 1
The mandrel 6 and the magnet table 44 revolve around the rotating shaft 2 based on the shapes of the shafts 2 and 41. That is, the mandrel 6 and the magnet table 44
It is displaced radially outward of the rotating shaft 2.

When the mandrel 6 is inserted into the can body 1 as described above, the heat of the mandrel 6 is transmitted to the can body 1, but the outer diameter of the mandrel 6 is slightly smaller than the inner diameter of the can body 1. Is set. More specifically, the outer diameter of the mandrel 6 is 2.0 to 4.0 mm larger than the inner diameter of the can body 1.
It is set small. For this reason, the outer surface of the mandrel 6 and the inner surface of the can body 1 do not always adhere to each other, so that heat transfer between the two becomes insufficient, and eventually, there is a possibility that the can body 1 cannot be sufficiently heated. In order to avoid such inconvenience, the inner surface of the can body 1 is forcibly brought into close contact with the mandrel 6 at the forced heat transfer station H1.

That is, in the forced heat transfer station H1, the belt 21 is moved from the outside of the movement path F1 of the mandrel 6.
Is pressed against the can body 1, so that the inner surface of the can body 1 is brought into close contact with the outer surface of the mandrel 6. Further, since the belt member 21 is running, each can body 1 rotates while being attracted and held by each magnet table 44, and the entire inner surface thereof is sequentially brought into close contact with the mandrel 6. That is, heat is evenly transmitted from the mandrel 6 to the entire can body 1. At this time, it is preferable that the mandrel 6 be rotatable with low torque so that no slippage occurs between the inner surface of the can body 1 and the mandrel 6.

After the mandrel 1 has passed the forced heat transfer station H1, the mandrel 6 and the magnet table 44 enter the area F4 corresponding to the film sticking station J1. Based on the shape, mandrel 6 and magnet table 4
4 moves on a movement locus about the rotation axis 26A.
At the film sticking station J1, the outer surface of the sticking drum 26 is pressed against the outer surface of the can body 1 and moves in parallel in the radial direction of the can body 1 against the magnetic attraction force of the magnet 46. And the heat of the can body 1 causes the can body 1 and the outer film to adhere to each other.

After the step of attaching the outer film to the outer surface of the can body 1 is completed in this manner, the can body 1 is again automatically moved in the radial direction of the can body 1 by the magnetic force of each magnet 46 and the electromagnetic induction action. Is positioned. Then, when the mandrel 6 and the magnet table 44 enter the area F6 after passing through the area F4, the mandrel 6 and the magnet table 44 are formed in an arc shape around the rotation shaft 2 based on the shapes of the cam grooves 12, 41. Move on the trajectory. When the mandrel 6 and the magnet table 44 advance to the can body discharging station L1, the shaft 43 and the magnet table 44 move in the center line direction based on the shape of the cam groove 30, and
The mandrel 6 is moved away from the mandrel 6, and the mandrel 6 is extracted from the inside of the can body 1. Then, the can body 1 is removed from the magnet table 44, and the can body 1 is transported to the next step. The magnet table 44 from which the can body 1 has been removed returns to the standby position before proceeding to the heating station K1.

As described above, according to this embodiment, the center line Q of the can body 1 held by the magnet table 44
1 and the center line B1 of the mandrel 6 are automatically matched (self-aligned), and the mandrel 6 is inserted into the can body 1 and the mandrel 6 is removed from the inside of the can body 1. Operation is performed. Further, while the can body 1 passes through the forced heat transfer station H1 and the film sticking station J1, the can body 1 is always held by the magnet table 44 by suction. Therefore, when the can body 1 is fitted to the mandrel 6 and when the can body 1 is removed from the mandrel 6, it is possible to prevent the inner surface of the can body 1 from coming into contact with the mandrel 6. Therefore, it is possible to prevent the inner surface or the inner surface coating layer of the can body 1 from being damaged, and to suppress a decrease in the product quality of the can body 1.

Further, according to this embodiment, when a predetermined load is applied to the outer peripheral surface of the can body 1 and a radial load is applied to the can body 1, the can body 1 is moved to the magnet table 44.
Slides along the end surface 47A of the plate 47 against the magnetic attraction force of the plate 47, and the inner surface of the can body 1 and the outer surface of the mandrel 6 come into line contact. Therefore, the predetermined process can be uniformly performed on the outer peripheral surface of the can body 1 along the height direction of the can body 1, and a decrease in the processing accuracy of the predetermined process on the outer surface of the can body 1 can be suppressed.

Further, according to this embodiment, the can body 1
Is set in the range of 52.4 to 52.5 mm, and the outer diameter of the mandrel 6 is set to 48.4 to 50.
The outer diameter of the mandrel 6 is set to be 2.0 to 4.0 mm smaller than the inner diameter of the can body 1. That is, since the outer diameter of the mandrel 6 is smaller than the inner diameter of the can body 1 by 2.0 mm or more, contact between the inner surface of the can body 1 and the mandrel 6 can be reliably prevented and the can body 1 can be prevented. In the case where a predetermined process is performed on the outer surface of the can body 1, that is, when the outer surface film is attached as described above, or when printing is performed, or when paint is applied, the outer surface of the can body 1 is radially applied. On the other hand, when a load (pressure) of about 3,000 N is applied, the can body 1 slides along the end surface 47A of the plate 47 and the can body 1 and the mandrel 6 come into contact with each other. Is relatively small value of 4.0 mm or less, so that the impact when the inner surface of the can body 1 comes into contact with the mandrel 6 is reduced.

Further, in this embodiment, since the plate 47 of the magnet table 44 is brought into contact with the end 51 of the can body 1 to hold the can body 1 by suction, the can body 1 is positioned in the center line direction. In the forced heat transfer station H1 and the film sticking station J1, the can body 1 can prevent the part facing the can body 1 from the outside of the movement trajectory F1 from coming into contact with the magnet table 44, and
The can body 1 can be reliably prevented from moving in the center line direction of the mandrel 6, and the accuracy of attaching the outer film is improved.

In the above embodiment, either a permanent magnet or an electromagnet may be used as the magnet 46. Also,
By connecting the magnet table 44 and the shaft 43 via a bearing (not shown) so that the magnet table 44 and the shaft 43 can rotate relative to each other, the can body 1 is attracted to the magnet table 44. However, the can body 1 can be easily rotated. As described above, when the can body 1 is easily rotated, in the forced heat transfer station H1,
The adhesion between the inner surface of the can body 1 and the outer surface of the mandrel 6 is further improved, and the adhesion / adhesion of the outer film to the outer surface of the can body 1 is further improved at the film sticking station J1.

In the above embodiment, the case 1 is for a three-piece can, that is, a cylindrical body 1 having both ends opened. It is also possible to use a barrel, that is, a bottomed cylindrical can body having one end opened and the other end having a bottom continuous with the cylinder. When using the two-piece can body, the can body is supplied to the can body supply station G1 with the bottom of the can body facing the magnet table 44 side.

Further, in the above embodiment, the can body is held by the magnetic attraction force of the magnet table 44. However, the can body 1 is held by the vacuum suction device (not shown), and the can body 1 is held. The center line Q1 and the center line B1 of the mandrel 6 may be configured to coincide with each other. When this vacuum suction device is used, the can body 1 can be held and positioned in the radial direction regardless of whether the material of the can body is a magnetic material or a non-magnetic material. Furthermore, in the above embodiment, the mandrel 6 is fixed in the center line direction, and the magnet table 44 is configured to reciprocate in the center line direction. Can also be adopted.

Here, the correspondence between the configuration of the embodiment and the configuration of the present invention will be described. The mandrel 6 corresponds to a holding member, and the magnet table 44 and the vacuum suction device correspond to a holding tool of the present invention. , The magnet 46 and the plate 47 correspond to the self-centering mechanism of the present invention, and the movement locus F
Reference numeral 1 corresponds to a predetermined track of the present invention.

[0065]

As described above, according to the first aspect of the present invention, the can body and the holding member are relatively moved in the direction of the center line while the center line is self-aligned. Contact between the inner surface of the can body and the holding member is avoided. Therefore, it is possible to prevent the inner surface of the can body from being damaged. When the can body is a can body having an inner surface coating, it is possible to prevent the inner surface coating from being damaged.

According to the second aspect of the invention, in addition to obtaining the same effects as the first aspect of the invention, when performing a predetermined treatment on the outer peripheral surface of the can body, the can body and the holding member are centered. The relative movement in the direction perpendicular to the line brings the inner surface of the can body into line contact with the holding member. Accordingly, it is possible to uniformly perform a predetermined process on the outer peripheral surface of the can body along the height direction of the can body, and to prevent the can body from being carelessly inclined or deformed in the radial direction. In addition, it is possible to suppress a decrease in the accuracy of the outer surface processing, such as a shift in the outer surface processing in the height direction of the can body and color unevenness during printing.

According to the third aspect of the present invention, in addition to obtaining the same effects as the first or second aspect of the present invention, the direction in which the can body is orthogonal to the center line is achieved by the magnetic force and the electromagnetic induction action of the plurality of magnets. In addition to the automatic positioning, the can body can move in a direction perpendicular to its center line against magnetic attraction when performing a predetermined process on the outer surface of the can body.

According to the fourth aspect of the present invention, in addition to obtaining the same effects as those of the first to third aspects of the present invention, the contact between the can body and the other holding member can be reliably prevented, and When performing a predetermined process on the outer surface of the can body, the impact of the contact between the can body and the other holding member is reduced.

According to the fifth aspect of the present invention, since the can body and the holding member are relatively moved in the center line direction with their center lines being self-aligned, the inner surface of the can body and the holding member can be moved relative to each other. Contact is avoided. Therefore, it is possible to prevent the inner surface of the can body from being damaged. When the can body is a can body having an inner surface coating, it is possible to prevent the inner surface coating from being damaged.

According to the sixth aspect of the invention, in addition to obtaining the same effects as the fifth aspect of the invention, when performing a predetermined treatment on the outer peripheral surface of the can body, the can body and the holding member are centered. The relative movement in the direction perpendicular to the line brings the inner surface of the can body into line contact with the holding member. Therefore, the predetermined process can be uniformly performed on the outer peripheral surface of the can body along the height direction of the can body, and the can body is prevented from being inadvertently inclined or deformed in the radial direction. In addition, it is possible to suppress a decrease in the accuracy of the outer surface processing, such as a shift in the outer surface processing in the height direction of the can body and color unevenness during printing.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a main part of an external surface processing apparatus according to an embodiment of the present invention.

FIG. 2 is a front view showing the overall configuration of the external processing apparatus according to the embodiment of the present invention.

FIG. 3 is a side view showing the magnet table of FIG. 1;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Can body, 6 ... Mandrel, 44 ... Magnet table, 46 ... Magnet, 47 ... Plate, 50 ... Open end, 51 ... End part, A1: External surface treatment apparatus, Q1, B1
... center line, F1 ... movement trajectory.

Claims (6)

[Claims] 1. An open end of a can body is arranged so as to face a distal end side of a shaft-shaped holding member running on a predetermined track, and the can body and the holding member are opposed to each other in a center line direction thereof. After moving and fitting and holding the can body with the holding member, a predetermined process is performed on the outer peripheral surface of the can body, and then the can body and the holding member are relatively moved in the axial direction. hand,
In the outer surface treatment device for a can body, which withdraws the can body from the holding member, a holding tool that sucks and holds an end of the can body opposite to an open end thereof faces a front end side of the holding member. Placed,
An outer surface treating apparatus for a can body, wherein the holder has an automatic centering mechanism for matching a center line of the can body with a center line of the holding member. 2. The self-aligning mechanism allows the can body and the holding member to relatively move in a direction orthogonal to the center line when performing a predetermined process on the outer peripheral surface of the can body. The outer surface treatment apparatus for a can body according to claim 1, wherein the apparatus has a function of performing the following. 3. The self-aligning mechanism includes a plurality of magnets attached to the holder and arranged on the same circumference around a center line of the holding member. The outer surface treatment apparatus for a can body according to claim 1 or 2. 4. The apparatus according to claim 1, wherein an outer diameter of the holding member is smaller by 2.0 to 4.0 mm than an inner diameter of the can body. . 5. An opening end of a can body is arranged so as to face a distal end side of a shaft-shaped holding member running on a predetermined track, and the can body and the holding member are opposed to each other in a center line direction. After moving and fitting and holding the can body with the holding member, a predetermined process is performed on the outer peripheral surface of the can body, and then the can body and the holding member are relatively moved in the axial direction. hand,
In the method for treating the outer surface of a can body that removes the can body from the holding member, the can body and the holding member are aligned in a center line direction with the center line of the can body and the center line of the holding member being aligned. A method for treating the outer surface of a can body, wherein the outer surface is relatively moved. 6. A method for treating an outer surface of a can body, wherein the can body and the holding member are relatively movable in a direction perpendicular to the center line when a predetermined process is performed on an outer peripheral surface of the can body. .