Metal deforming – By use of tool acting during relative rotation between tool... – During rotation of work
Reexamination Certificate
2000-06-22
2002-01-15
Tolan, Ed (Department: 3725)
Metal deforming
By use of tool acting during relative rotation between tool...
During rotation of work
C072S015200, C072S015300, C072S017300, C072S094000, C072S379400
Reexamination Certificate
active
06338263
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a method for manufacturing an embossed can body where a pattern is printed on an outer surface of a cylindrical can barrel, and one or both of a projection portion and a recess portion are registered with the pattern and are formed on at least one portion of the pattern, in particular, a method for manufacturing an embossed can body which can perform an alignment between a pattern and at least one portion of a projection portion and a recess portion (a projection portion/a recess portion) securely.
BACKGROUND ART
In recent years, because of variety in design, improvement in strength of a can barrel according to thinning a wall thickness of a can barrel, and the like, an embossed can body whose can barrel has been subjected to one or both of projecting working and recessing working is developed and commercialized.
In this case, when one or both of projecting work and recessing work are performed on the embossed can body with alignment with a pattern, a character or the like (which are collectively referred to as pattern) which has been printed on the embossed can body, a design performance of the embossed can body can be improved. For this reason, an embossing of one or both of a recess portion and a projection portion corresponding to a pattern is performed on at least one portion of the pattern.
FIG. 12
is a perspective view of one example of an embossed can body.
An embossed can body
10
shown in
FIG. 12
is a three piece can comprising a can barrel
11
′, a can lid
12
and a can bottom
13
. The can barrel
11
′ is made of a metal thin plate, and is formed in a cylindrical shape by welding both ends of the thin plate at welding portions
14
.
Printed at an upper portion on an outer surface of the can barrel
11
′ is a pattern (characters)
11
d
which is “BEER”. Also, a pattern (characters)
15
which is “CAN” and which is worked to be recessed or projected is largely printed at a central portion of the outer surface of the can barrel.
The patterns
11
d
,
15
are covered with a polyester film or an organic coating after they are printed on the outer surface of the can barrel
11
′. The patterns may be printed on a back surface (a surface contacting with an outer surface of the can barrel) of the polyester film or the organic coating in advance.
Recess portions
16
which correspond to “CAN” are formed on the can body
11
′ in a state where they are aligned with the pattern
15
. In an aspect where the forming is performed in the state where the pattern
15
and the recess portions
16
correspond to each other, it is not limited to an aspect where the entire pattern corresponds to the entire recess portions. An aspect where the pattern
15
corresponds to a portion of the recess
16
may be allowed. For example, an aspect where recessing is performed on only “A” of the pattern “CAN” or printing is performed on “A” of the recess portion “CAN” may be possible.
As conventional techniques for performing such one or both of a recess portion and a projection portion forming work on a can barrel, there have been known the title “TOOLING AND METHOD THE EMBOSSING OF A CONTAINER AND THE RESULTING CONTAINER” of International Laid-Open Publication No. WO98/03279 and the title “METHOD OF ORIENTING CANS” of No. WO97/21505.
In these conventional techniques, a positioning mark
17
indicating a position of a pattern portion is formed on the can barrel
11
′ in order to position forming means for performing one or both of a recess portion and a projection portion forming work to the pattern portion of the can barrel, as shown with a can body
10
in FIG.
12
and the mark
17
is read by a sensor, so that the rotation of the can barrel
11
′ is controlled such that the pattern
15
is positioned so as to correspond to the forming means.
Also, for the purpose of reducing manufacturing cost of a can body, a rotary type apparatus and a method for performing recess and projection working at a high speed have been disclosed, for example, in International Laid-Open Publication Nos. WO98/03279 and WO98/03280.
FIG. 13
is a diagram explaining procedures for performing recess and projection working on the can barrel
11
′ by the above rotary type apparatus and method.
The can barrel
11
′ is introduced from a position shown with (
1
) in FIG.
13
. The positioning mark
17
(refer to
FIG. 12
) of the introduced can barrel
11
′ is detected at turret positions (
1
) and (
2
) by sensors
151
or the like arranged at respective pockets.
The sensors
151
or the like detect the mark
17
. The can barrel
11
′ is rotated such that the pattern
15
faces a predetermined position (a position which corresponds to recess/projection portion of a forming die). Thereafter, while the attitude of the can barrel
11
′ is maintained, the can barrel
11
′ is sent up to a position shown with a turret position (
3
) in
FIG. 13
where an inner roller
101
is inserted.
Also, a cam member
140
is disposed outside the inner roller
101
over a range slightly larger than a range of a turret positions (
3
) to (
9
). The cam member
140
shifts the outer roller
102
towards the inner rollers
101
by means of a cam roller (not shown). Thereby, an inner wall of the can barrel
11
′ positioned so as to contact the outer roller
102
is pressed on to the inner roller
101
in the range of the turret positions (
4
) to (
8
).
Then, a recess/projection working is performed on the can barrel
11
′ while the inner roller
101
and the outer roller
102
are being rotated in the range of the turret positions (
4
) to (
8
). When the can barrel
11
′ is fed up to the turret position (
9
), the pressing of the cam roller (not shown) effected by the cam member
140
is released, and the inner roller
101
comes out from the can barrel
11
′.
In this manner, the working for the recess portion
16
is performed on the pattern
15
of the can barrel
11
′. The can barrel
11
′ which has been worked is conveyed out at an discharging position A from the forming apparatus of the can body.
These conventional techniques are excellent inventions, but there are drawbacks to be improved in view of implementation thereof.
That is, in a case that embossing is performed at a high speed of 1,000 cans to 2,000 cans/min., when there is variation in shape of can barrels
11
′ such as circularity or the like, there occurs a case where the sensors
151
can not read the positioning mark
17
of the can barrel
11
′ accurately because the can barrel
11
′ is rotated at high speed. As a result, it becomes impossible to perform an accurate positioning so that the pattern
15
and the recess portion
16
do not correspond to each other in some cases.
Also, in can manufacturing steps, there occurs a case where the can barrel
11
′ becomes dirty or dusts stick to the can barrel
11
′. In such a case, there is a case that the sensors
151
mistake dirt for the positioning mark
17
. Particularly, in a can body which has the can barrel
11
′ having a metallic welded line such as a three piece can, there is a case where the sensors
151
mistake a welded portion for the positioning mark
17
.
Furthermore, in a case that there are variations in shape of the can barrel
11
′, when the can barrel
11
′ sets to the inner rollers
101
which is a forming die for performing embossing, the set position of the can barrel
11
′ varies. As a result, there is a problem that embossing corresponding to the pattern
15
can not be performed securely.
Also, even if the orientation of the can barrel
11
′ is adjusted according to the positioning mark
17
before forming, when slippage occurs between the outer roller
102
and the can barrel
11
′, the pattern
15
and the recess portion
16
deviate from each other, thereby resulting in a poor product.
On the other hand, in order to inspect the pattern
15
and the recess portion
16
Morishita Sunao
Obata Kazumoto
Ookubo Wataru
Kanesaka & Takeuchi
Tolan Ed
Toyo Seikan Kaisha Ltd.
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