US-20260124668-A1 - CAN LID MANUFACTURING DEVICE, CAN LID MANUFACTURING METHOD, CAN LID, AND CAN CONTAINER CONTAINING CONTENTS

US20260124668A1US 20260124668 A1US20260124668 A1US 20260124668A1US-20260124668-A1

Abstract

A can lid manufacturing device, a can lid manufacturing method, a can lid, and a can container containing contents that improve openability and pressure resistance of the can lid with a simple configuration. A can lid manufacturing device is configured to manufacture a can lid, the can lid manufacturing device including: a rolling direction detection unit including a rotation drive unit configured to rotate the can lid and a reflected light detection unit; and a control unit. The reflected light detection unit includes a light-emitting unit and a light-receiving unit, and the control unit is configured to detect the rolling direction of the can lid based on change information on a change in light intensity of the reflected light reflected by the can lid to rotate, the information being obtained by the rolling direction detection unit.

Inventors

Kouhei Endo
Tatsuya Nakamura
Kazuyuki Miyata
Takuya Mori
Keita FUKUDA
Haruka Matsubara

Assignees

TOYO SEIKAN CO., LTD.

Dates

Publication Date: 20260507
Application Date: 20260102
Priority Date: 20230714

Claims (14)

1 . A can lid manufacturing device configured to manufacture a can lid, the can lid manufacturing device comprising: a rolling direction detection unit including a rotation drive unit configured to rotate the can lid and a reflected light detection unit; and a control unit, wherein the reflected light detection unit includes a light-emitting unit configured to irradiate the can lid with irradiation light, and a light-receiving unit configured to receive reflected light reflected by the can lid, of the irradiation light, and the control unit is configured to detect a rolling direction of the can lid based on change information on a change in light intensity of the reflected light reflected by the can lid to rotate, the change information being obtained by the rolling direction detection unit.
2 . The can lid manufacturing device according to claim 1 , wherein the rolling direction detection unit further includes a rotational position adjusting unit configured to adjust a rotational position of the can lid based on rolling direction information of the can lid, the rolling direction information being obtained by the control unit.
3 . The can lid manufacturing device according to claim 2 , wherein the rotation drive unit and the rotational position adjusting unit are formed of identical equipment configured to rotate the can lid.
4 . The can lid manufacturing device according to claim 1 , further comprising: a can lid feeder configured to feed a can lid onto a conveying conveyor, wherein the can lid feeder includes a can lid storage unit in which a plurality of can lids are stored in a stacked state, a can lid temporary retaining portion which is formed on a lower side of the can lid storage unit and in which one can lid is retained, an upper side feeding portion configured to feed the can lid stored in the can lid storage unit to the can lid temporary retaining portion, and a lower side feeding portion configured to feed the can lid retained in the can lid temporary retaining portion toward the conveying conveyor, and the rolling direction detection unit is installed to detect the reflected light with respect to the can lid retained in the can lid temporary retaining portion.
5 . The can lid manufacturing device according to claim 4 , wherein the can lid feeder includes a transfer rotating body rotatable about a vertical axis, the transfer rotating body includes, on an outer peripheral surface, an upper side engagement portion engageable with the can lid, and a lower side engagement portion engageable with the can lid formed on a lower side of the upper side engagement portion, the upper side engagement portion functions as the upper side feeding portion configured to feed the can lid stored in the can lid storage unit to the can lid temporary retaining portion in accordance with rotation of the transfer rotating body, and the lower side engagement portion functions as the lower side feeding portion configured to feed the can lid retained in the can lid temporary retaining portion toward the conveying conveyor in accordance with rotation of the transfer rotating body.
6 . The can lid manufacturing device according to claim 5 , wherein the can lid temporary retaining portion is formed of an outer peripheral recessed portion recessed in an outer peripheral surface of the transfer rotating body in a region between the upper side engagement portion and the lower side engagement portion.
7 . The can lid manufacturing device according to claim 4 , wherein the rolling direction detection unit further includes a rotational position adjusting unit configured to adjust a rotational position of the can lid based on rolling direction information of the can lid, which is obtained by the control unit, and the rotational position adjusting unit is configured to start adjustment of the rotational position of the can lid at least in the can lid temporary retaining portion.
8 . The can lid manufacturing method according to claim 7 , wherein the rotational position adjusting unit is configured to adjust the rotational position of the can lid to a predetermined rotational position with an accuracy within ±10°.
9 . The can lid manufacturing device according to claim 1 , wherein the light-emitting unit of the reflected light detection unit is installed to apply irradiation light to a chuck wall portion of the can lid from an outer peripheral side.
10 . The can lid manufacturing device according to claim 1 , further comprising: an inspection machine installed on a downstream side of the rolling direction detection unit and configured to detect an orientation of the rolling direction of the can lid with respect to a conveying direction of the can lid.
11 . A can lid manufacturing method for manufacturing a can lid, the can lid manufacturing method comprising: a rolling direction detection unit including a rotation drive unit configured to rotate the can lid and a reflected light detection unit; and a control unit, wherein the reflected light detection unit includes a light-emitting unit configured to irradiate the can lid with irradiation light, and a light-receiving unit configured to receive reflected light reflected by the can lid, of the irradiation light, and the control unit detects the rolling direction of the can lid based on change information on a change in light intensity of the reflected light reflected by the can lid to rotate, the change information being obtained by the rolling direction detection unit.
12 . A can lid manufactured by the can lid manufacturing method according to claim 11 .
13 . The can lid according to claim 12 , comprising: a center panel portion, wherein at least one plate material deformed portion obtained by deforming a plate material in a thickness direction is formed in the center panel portion, the center panel portion includes a narrow width portion that is a portion in which a distance between the plate material deformed portion and an outer edge of the center panel portion is narrowest among portions between the at least one plate material deformed portion and the outer edge of the center panel portion, and the can lid is formed such that an imaginary line passing through the narrow width portion and a center of the center panel portion is parallel or substantially parallel to the rolling direction.
14 . A can container containing contents, comprising: the can lid according to claim 12 ; and a can barrel in which contents are filled and to which the can lid is seamed.

Description

CROSS-REFERENCE TO RELATED APPLICATION This application is a Rule 53(b) continuation application of International Application No. PCT/JP2024/016984 filed on May 7, 2024, which claims the benefit of priority from Japanese Patent Application No. 2023-115932 filed on Jul. 14, 2023 and designating the U.S., the entire contents of which are incorporated herein by reference. TECHNICAL FIELD The disclosure relates to a can lid manufacturing device, a can lid manufacturing method, a can lid, and a can container containing contents. BACKGROUND ART Conventionally, it is generally known that a metal can container is used as a container for storing contents such as a beverage (for example, see JP 4239039 B), and it is also well known that a can lid constituting such a can container is formed of a rolled metal plate formed by rolling. SUMMARY However, it has been found that, in a can lid formed from such a rolled metal plate, the relationship between a rolling direction of the can lid (i.e., direction in which roll lines formed in the rolled metal plate extend) and a direction in which a score or the like is formed in the can lid affects openability (i.e., force required to break the score) and pressure resistance of the can lid. An object of the disclosure is thus to provide a can lid manufacturing device, a can lid manufacturing method, a can lid, and a can container containing contents that improve openability and pressure resistance of the can lid with a simple configuration. A can lid manufacturing device according to the disclosure is a can lid manufacturing device configured to manufacture a can lid, the can lid manufacturing device including: a rolling direction detection unit including a rotation drive unit configured to rotate the can lid and a reflected light detection unit; and a control unit. The reflected light detection unit includes a light-emitting unit configured to irradiate the can lid with irradiation light, and a light-receiving unit configured to receive reflected light reflected by the can lid of the irradiation light, and the control unit is configured to detect a rolling direction of the can lid based on change information on a change in light intensity of the reflected light reflected by the can lid to rotate, the change information being obtained by the rolling direction detection unit. A can lid manufacturing method according to the disclosure is a can lid manufacturing method for manufacturing a can lid, the can lid manufacturing method including: a rolling direction detection unit including a rotation drive unit configured to rotate the can lid and a reflected light detection unit; and a control unit. The reflected light detection unit includes a light-emitting unit configured to irradiate the can lid with irradiation light, and a light-receiving unit configured to receive reflected light reflected by the can lid of the irradiation light, and the control unit detects the rolling direction of the can lid based on change information on a change in light intensity of the reflected light reflected by the can lid to rotate, the change information being obtained by the rolling direction detection unit. In the above can lid manufacturing device (or the can lid manufacturing method), the rolling direction detection unit may further include a rotational position adjusting unit configured to adjust a rotational position of the can lid based on rolling direction information of the can lid, which is obtained by the control unit. In any one of the above can lid manufacturing devices (or the can lid manufacturing methods), the rotation drive unit and the rotational position adjusting unit may be formed of identical equipment configured to rotate the can lid. In any one of the above can lid manufacturing devices (or the can lid manufacturing methods), a can lid feeder configured to feed a can lid onto a conveying conveyor may be further provided. The can lid feeder may include a can lid storage unit in which a plurality of can lids are stored in a stacked state, a can lid temporary retaining portion which is formed on a lower side of the can lid storage unit and in which one can lid is retained, an upper side feeding portion configured to feed the can lid stored in the can lid storage unit to the can lid temporary retaining portion, and a lower side feeding portion configured to feed the can lid retained in the can lid temporary retaining portion toward the conveying conveyor. The rolling direction detection unit may be installed to detect the reflected light with respect to the can lid retained in the can lid temporary retaining portion. In any one of the above can lid manufacturing devices (or the can lid manufacturing methods), the can lid feeder may include a transfer rotating body rotatable about a vertical axis. The transfer rotating body may include, on an outer peripheral surface, an upper side engagement portion engageable with the can lid and a lower side engagement portion engageable with the