JPH0248102Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a seaming roll for a can sear that is driven to rotate forcibly.

BACKGROUND ART Generally, in a can seaming machine that double seams a can using a first seaming roll and a second seaming roll, the seaming roll is rotatably supported,
When it comes into contact with and is pressed against the outer circumference of the seaming part of the can lid, it rotates due to frictional force and seals the seam, but it slides on the outer circumferential surface of the seam part until it achieves synchronized rotation with the seaming part outer circumference. Therefore, when the seaming rolls start making contact, a braking action occurs due to the difference in circumferential speed of the contact surfaces, which applies an impact to the can body, making it difficult to perform good seaming. In order to solve this problem, it is necessary to hold the can body with strong lifter pressure and seal it with strong forming pressure. However, in recent years, can bodies made of thin-walled metal cans, plastic materials, or laminated materials of plastic film or paper and metal foil have been adopted in place of conventional metal cans. In such cases, if the can body is clamped with strong lifter pressure, it will buckle and result in poor seaming. Therefore, a system has been proposed in which the seaming roll is forcibly driven to rotate in order to prevent slippage between the seaming roll and the seaming surface and to enable good seaming even in can bodies with weak shaft strength. As a method for forcibly rotating the seaming roll, the seaming roll and seaming chuck are meshed together using frictional force (for example, as described in British Patent No.
1049601) and one using a gear transmission mechanism (for example, Japanese Utility Model Application Publication No. 126238/1983) has been proposed.

Problems that the invention attempts to solve: In order to prevent seaming roll slippage,
The circumferential speed of the seaming roll and the forming surface must always match. During seaming, the can, which is held at a predetermined lifter pressure, is rotated at a constant speed by the seaming chuck and lifter, but the seaming roll approaches from the side and presses the seaming part. As the diameter of the seamed portion gradually decreases through forming, the circumferential speed of the seamed portion decreases accordingly. Therefore, in order to prevent the seaming roll from slipping, the circumferential speed of the seaming roll must also be reduced accordingly. However, as previously proposed, the seaming roll is forcibly rotated using frictional force, particularly a gear transmission mechanism, but the circumferential speed of the seaming roll is constant because it rotates at a constant rate in synchronization with the seaming chuck. There was a problem in that it was always constant and could not change to follow the change in circumferential speed due to a decrease in the diameter of the seamed portion, resulting in slippage.

The present invention was devised in view of the above-mentioned circumstances, and by improving the forced drive mechanism of the seaming roll, seaming can be performed by following changes in the circumferential speed of the can seaming part during seaming. The speed of the roll changes so that the circumferential speed of the seaming roll and the seaming part's outer diameter always match, preventing the seaming roll from slipping and seaming can bodies with weak shaft strength. It is an object of the present invention to provide a seaming roll that can be seamed well even when holding a can body with a weak lifter pressure during seaming.

Means for Solving the Problems The seaming roll of the present invention has a configuration characterized in that a blade portion that receives air and applies rotational force is formed on the peripheral wall portion other than the portion where the forming groove is formed. We were able to achieve the above objectives.

Function The seaming roll is driven to rotate by blowing pressurized air onto the blades from the nozzle tip. Rotating the seaming roll so that its circumferential speed matches the circumferential speed of the can seaming part, and pressing the seaming roll against the seaming part while rotating at the same speed as the outer periphery of the seaming part. As a result, slippage at the start of pressure welding can be eliminated, and the impact is reduced without exerting a braking effect on the can body. Since the seaming roll is rotationally driven by air, it is flexible, and after the seaming roll comes into pressure contact with the seaming part, the rotation of the seaming roll is mainly controlled by the frictional force of the seaming part. Therefore, as seaming progresses, even if the circumferential speed decreases as the outer diameter of the can seaming portion decreases, the seaming roll always rotates to follow the circumferential speed of the seaming portion. Smooth seaming is possible without slipping.

Embodiments Hereinafter, embodiments of the present invention will be described based on the drawings. FIG. 1 shows a first embodiment of a seaming roll according to the present invention.

In the figure, 1 is a non-interlock type seaming roll (the first seaming roll or the second seaming roll, the same applies to the following examples), which is suspended and supported from the head part of the main body of the can seaming machine (not shown). The roller pin 2 is rotatably supported by a bearing 3. Reference numeral 4 denotes a forming groove formed on the outer circumferential surface of the seaming roll, which presses and forms the can seaming portion. The above configuration is similar to a conventional non-interlock type seaming roll.

Reference numeral 5 denotes a blade portion for receiving air and giving rotation to the seaming roll, and as shown in Fig. 2, grooves 6 of a predetermined depth are formed at equal intervals on the peripheral wall of the seaming roll. It is configured.

Reference numeral 8 denotes an air hose fixed to the head of the can sealing machine, and the seaming roll 1 is rotated by blowing air from a nozzle at its tip into the groove 6 of the blade portion.

The seaming roll of this embodiment has the above configuration, and the seaming roll is rotationally driven by blowing pressurized air into the grooves 6 of the blade portion 5 from the nozzle tip. By adjusting the pressure of the air being blown, the rotational speed of the seaming roll can be freely adjusted.

To perform can seaming, the seaming roll is rotated in advance so that the circumferential speed of the seaming roll matches the peripheral speed of the seaming part of the can lid, and the seaming roll is brought into pressure contact with the seaming part of the can lid. Start tightening. The rotational driving force of the seaming roll by air is weak, and when the seaming roll comes into pressure contact with the seaming part, the seaming roll is rotated mainly by the frictional force of the pressure contact part. Therefore, as seaming progresses, even if the outer diameter of the can seaming portion decreases and the circumferential speed decreases, the seaming roll rotates following the circumferential speed of the seaming portion.
Smooth seaming is possible without slipping.

3 and 4 show a second embodiment of the seaming roll of the present invention. This embodiment can also be obtained by improving the conventional non-interlock type seaming roll, and is a modification of the blade portion of the above embodiment.

In the figure, reference numeral 10 denotes a blade portion, and in this embodiment, grooves 11 are formed at equal intervals with an appropriate width from above the outer peripheral portion of the seaming roll to the upper portion of the forming groove.

FIG. 5 shows a third embodiment of the present invention, which is an improved interlock type seaming roll, and shows the state in which it is engaged with a seaming chuck. In this embodiment, the first seaming roll 1
2. Groove 1 in the part of the second seaming roll 13 that engages with the flange portion 16 of the seaming chuck 15
Grooves 19 and 20 are provided at equal intervals in the upper outer circumferential wall portions of 7 and 18 to form blade portions 21 and 22. In addition, in the figure, 23 and 24 are air tubes.

6 and 7 show a fourth embodiment of the present invention, which is a modification of the third embodiment. In this example,
The groove 26 of the blade part 25 is formed to penetrate from above into a groove 27 formed on the outer peripheral part of the seaming roll which engages with the flange part of the seaming chuck.

Although various embodiments of the present invention have been shown above, the present invention is not limited to these embodiments, and may be any device that rotates when receiving air from a seaming roll, and the design of the blade portion can be changed in various ways. It is.

Effects As described above, according to the present invention, seaming is started by pressing the seaming roll against the seaming part while rotating at the same speed as the outer periphery of the seaming part, so there is no slippage at the start of seaming. The impact can be reduced without exerting a braking effect on the can body. Since the seaming roll is rotationally driven by air, it is flexible, and after the seaming roll comes into pressure contact with the seaming part, the rotation of the seaming roll is mainly controlled by the frictional force of the seaming part. Therefore, as seaming progresses, even if the outer diameter of the can seaming section decreases and the circumferential speed decreases, the seaming roll always rotates to follow the circumferential speed of the seaming section, preventing slippage. Smooth seaming can be done without any occurrence of seams. the result,
Even if the can body is held with a weak lifter pressure, sufficient seaming can be performed, and even a can body made of a can material with weak shaft strength can be securely seamed. In addition, since the blades are simply formed on the seaming roll and no special interlocking mechanism is required, it can be easily applied to a conventional can seaming machine by simply improving the conventional seaming roll, which is exceptional in practical terms. It has the following effects.

[Brief explanation of the drawing]

The drawings show embodiments of the seaming roll of the present invention, FIG. 1 is a front sectional view of the first embodiment, FIG. 2 is a front view thereof, and FIG. 3 is a front sectional view of the second embodiment.
Fig. 4 is a sectional view taken along the line A-A in Fig. 3, Fig. 5 is a front sectional view of main parts of a can seaming machine to which the seaming roll of the third embodiment is applied, and Fig. 6 is a front view of the fourth embodiment. The sectional view and FIG. 7 are the plan views thereof. 1: seaming roll, 2: roll pin, 3:
Bearing, 4: Molding groove, 5, 10, 19, 2
1, 22, 25: blade part, 6, 11, 19, 2
0, 26: Groove of blade part, 12: First seaming roll, 13: Second seaming roll, 15: Seaming chuck, 16: Flange part, 17, 1
8, 27: Engagement groove.

Claims (1)

[Scope of utility model registration request] This is a seaming roll for a can sealing machine that double-seals a can lid to the opening of a can body, and a blade portion is formed on the peripheral wall other than the area where the molding groove is formed to receive air and apply rotational force. A seaming roll for a can tightening machine.