JPS62101331A - Seaming method of three piece can body having low axial strength and its device - Google Patents

Abstract

PURPOSE:To prevent the cause of defective seaming with the buckling of a can body and to perform double seaming properly by feeding a compressed air into the can body simultaneously with the pinching of a lifter and chuck. CONSTITUTION:A can body 1 is placed on the center part of a lifter plate 4 by feeding a cover body 3 to the seaming turret by its placing on the upper part opening part by the can feeding turret with the can shell body 2 being transferred. With turning of the turret further the lifter main body A is ascended by a cam 12, a chuck B is fitted to the cover body 3 and the can body 1 is pinched by the lifter A and chuck B. At this time the air passage 25 of the turret main body reaches to the opening 24 of the air path 23 inside the turret main body, the both become in continuity state and the compressed air is instan taneously fed into the can body 1. In this way the axial strength of the can shell body 2 is increased and thereafter the double seaming is performed by a seaming roller with further turning of the turret.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method and apparatus for seaming a three-piece can body whose can body is made of a material with low axial strength.

Conventional technology All 1 @ 2 well-known conventional techniques used for seaming cans, etc.
In the seaming method, the entire can body is supported between the tar and the chuck against the seaming pressure from the seaming rolls ('(, can 111
- A big hit on one person (lifter pressure and ++-)
is added. For this reason, in the case of a can body made of a plastic material with low equiaxial strength, the can body will buckle and the flange will escape in the axial direction of the can body when the seaming is about 11φ, and the required body hook length will be reduced. There was a problem that the seaming strength was insufficient because six paddles could not be used.

In order to solve the above problem, for example,
New double seaming methods have been proposed as described in JP-A No. 8-35028, JP-A-58-35029, and JP-A-58-47530.

The seaming method described in the above publication uses a special seaming device that employs special rolls such as support rolls and backup rolls to receive the axial component force at the time of seaming with the rolls. This prevents large axial loads from acting on the flange and prevents the flange from escaping.

Problems to be Solved by the Invention As mentioned above, it is difficult to seam can bodies with weak shaft strength with the conventional seaming devices that are commonly used for metal cans and the like. For this reason, the above-mentioned method of seaming has been proposed, but it requires a special seaming device instead of the conventional seaming device that is generally used, which increases equipment costs and requires new seaming. There were problems such as requiring a space board to install a dedicated winding in.

The present invention was devised in view of the above-mentioned circumstances, and can be made of a can body made of plastic such as polyethylene terephthalate, a laminate of gold foil and a plastic sheet, or a can body made of paper or thin aluminum. An object of the present invention is to provide a seaming method and device that can perform double seaming of a three-piece can body with low axial strength by simply improving the lid of a conventional double seaming device. That is.

Means for Solving the Problems The present invention was made with the aim of substantially increasing the shaft strength by increasing the internal pressure by supplying compressed air into the can with weak shaft strength. 〇The first invention is to hold the entire can body with a lid fitted to the upper opening of the can body between a lifter A and a chuck B, and simultaneously inject compressed air into the can body 1 through the lid A6. The structure is such that a positive pressure is created inside the can body by fully supplying the can body, and seaming is performed while maintaining the positive pressure inside the can body until the seaming is completed.

・Okina's second invention is a device for carrying out the first invention, which supplies compressed air into the can body at the position where the can body 1 is clamped between lifter A and chuck B, and completes seaming. A full compressed air supply path is provided in the lifter for releasing the l'F compressed air in the can body 1 to the atmosphere at a certain position.

Operation Lifter A, which has a lid e and a can placed 1 ftJu above the upper opening, rises and clamps the can between lifter A and chuck B, and at the same time, the compressed air supply path provided in the lifter opens. Open^, compressed air is supplied into the can body, and the inside of the can body is maintained at a constant positive IF. In this state, tighten the two wheels. When the seaming is completed, the compressed air supply path is opened to the atmosphere, and the inside of the can body is returned to normal pressure.

By supplying compressed air, the compressed air becomes an internal pressure, which actually increases the axial strength of the can body, resists lifter pressure, and prevents buckling of the can body.

EXAMPLE The following is a detailed description of an embodiment of the apparatus and method of the present invention based on the drawings. Figures 1 and 2 are cross-sectional views of the seaming device and lid A, and Figure 1 is a can body. Figure 1 shows the state when the beam has been transferred to the lifter A and has reached the seaming center, and Figure 2 shows the state when the beam lid 1- has risen and is fitted to the chuck B which is positioned at the top and IH. ing.

In the figure, 4 is a lid plate on which the can is placed, and is fixed to a support base 5.

The plate support assembly 5 is rotatably supported by a spring support member 8 via a spring adjustment screw 6 and a bearing 7, and is pressurized upward by a spring 9. 】O is a rotating body that can move up and down, 11 is a lifter body, 1
2 is a cam, 13 is a drive gear 514 attached to the rotating body 6, 15 is a cam roller attached to the lifter body, and 16 is a turret body. Each of the above configurations is a lifter in a conventional seaming device described in Japanese Patent Publication No. 59-42578.

In this embodiment, in the above-mentioned conventional lift lid, a compressed air supply path as described in detail below is provided to supply compressed air into the can body 1 on the lifter plate 4.

20Fi is a socket for supplying compressed air into the lifter from a compressed air supply source such as a compressor (not shown), and the socket is fixed to the machine frame (not shown).
Moreover, as shown in FIG. 1, it is provided in close contact with the turret body.

The sliding surface 21 with the rotating turret body is sealed to prevent compressed air from leaking. Maekawami socket 20
As shown in FIG. 3, is provided in a section from a position where the lifter receives the can body and clamps the can body between the lifter and the chuck to a position where seaming is completed. An elongated air chamber 22 is provided on the sliding surface 21 of the socket 20 with the turret body. An air passage 23 is formed in the turret body upward from a position in the air chamber 22 as shown in the figure, and the air passage has an opening 24 in the sliding surface with the lifter body 11.

On the other hand, an air passage 25 is also provided at the position where the lid body 11 makes sliding contact with the rotating body 10, and the core air passage 25 reaches the position where the lifter body 11 clamps the can body 1 with the chuck B. It is positioned so as to communicate with the opening 24 of the air passage 23 when raised. 27 is a rotating body 10 located at a position facing the air passage 25 of the lifter body.
28 is an annular groove formed around the annular groove 27.
This is an air passageway that connects the space 28 at the center of the rotating body. Furthermore, an air passage is provided from the space 29 to pass through the spring support member 8, the bearing 7, the spring adjustment screw 6, and the lifter plate 4,
The air passage 30 opens at the center of the lifter plates 1 and 4. As described above, the compressed air supply route to the can body 1? Configure.

Next, an example of the method for seaming a three-piece can body with low shaft strength according to the present invention will be explained.
In the state shown in FIG. 1 where the air passage 23 is in the lower position,
Since the opening 24 of the lifter main body 11 is not closed, compressed air is not supplied into the lifter main body 11.The can body 2 is carried by a conveyor (not shown) and is transported by the can supply turret 1-CFT. Lid body 3 in the upper opening
is placed on the can body 1 and supplied to the seaming turret ST.
is placed in the center of the lifter plate 4. When the turret further rotates from this state, the lifter main body A is raised by the cam I2, the chuck B fits into the lid body 3, and the can body 1 is held between the lifter A and the chuck B. Figure 202 shows the state k rr at this point. At this point, the air passage 25 of the turret body reaches the opening 24 of the air passage 23 within the turret body, and the two become electrically connected. - Therefore, the royal air supply path from the compressed air source is the air chamber 22, the air passage 23, 25,
The annular groove 27, the air passage 28, the space 29, the air passage 30, and the can body 1 are formed in this order, and compressed air is instantaneously supplied into the can body 1.

Note that the compressed air is controlled by a valve mechanism so that the compressed air is not supplied into the can body 1 above a certain pressure.

By supplying compressed air into the can body, internal pressure is generated within the can body, thereby substantially increasing the axial strength of the can body 2. Thereafter, the turret is rotated further and the turret is tightened by a seaming roller (not shown) in a well-known manner. X-sealing is performed. At this time, a strong axial load (lifter pressure) is further applied to the can body I, but since compressed air is supplied into the can body I during the seaming operation, the internal pressure of the compressed air strengthens the can body's axial strength. This prevents the can body from buckling due to lifter pressure. Therefore, it is possible to prevent the conventional case where the can body buckles and the 7 flange part escapes during seaming, making it impossible to ensure the required body hook length, thereby ensuring proper winding. can be tightened.

When the turret rotates to the position where the seaming work is completed,
Since the air passage 23 of the turret body is separated from the compressed air supply socket 20 and opened to the atmosphere, the inside of the can body 1 returns to normal pressure.

The can body that has been seamed is discharged from the seaming turret ST by the discharge turret DT.

FIG. 4 shows an embodiment employing pond means for supplying compressed air into the turret body from a compressed air supply source.

In this embodiment, the compressed air supply socket 34 is arranged only in the vicinity of the position where the can body is held between the lifter A and the chuck B, while a valve 36 is provided at the outer opening of the air passage 35 of the turret body. It is being The valve opens when the turret rotates and the air passage 35 reaches the position of the compressed air supply socket 34, receives compressed air supply, and closes when the air passage 35 leaves the socket 34 position e. The internal pressure inside the can body 1 is maintained, and when the seaming of the can body 1 is completed, it is opened again to open the air passage to the atmosphere.

Effects As described above, the present invention supplies compressed air into the can body at the same time as the lifter and chuck are clamped, so even if a high axial load is applied afterward due to seaming, the compressed air acts as internal pressure and the pressure is substantially reduced. Increase the axial strength of the can body. Therefore, the can body does not buckle and cause poor seaming, and the can body is made of a material with low shaft strength and is double-sealed.

Furthermore, since the present invention only requires a compressed air supply path to be provided on the lid of a conventional double-sealing device, it can be easily applied to the conventional device. Since it can be used in parallel with other equipment, there is no need to provide a dedicated seaming line, and it has significant practical effects.

[Brief explanation of drawings]

The drawings show an actual example of the seaming device of the present invention, and FIG. 1 is a sectional view of a part of the lifter, FIG. 2 is a sectional view of the upper part of the lifter, and FIG. Sealing device arrangement ``6
Fig. 4 is a partial cross-sectional view of an embodiment of a beam lid pond Mouth 1: Can body 2: Can body 3: Lid body 4: Lifter plate 5: Support stand 6: Spring adjustment screw ] 0: Rotation Body 11: Lifter body 12: Cam 16: Turret body 20.34: Compressed air supply socket 22: Air chamber 23.25.28.30: Air passage 2
7: Annular groove 36: Valve patent applicant Toyo Seikan Shiki Kaishi applicant agent Benyashi Fumi Sato (and 2 others)
Figure 3 Figure 4

Claims (1)

[Claims] 1) In a method for seaming a three-piece can body in which the can body is made of a material with low axial strength, the can body with the lid fitted into the upper opening of the can body is attached to a lifter. The shaft strength is characterized by clamping the can with a chuck and at the same time supplying compressed air into the can through a lifter to create positive pressure inside the can, and performing seaming by maintaining the positive pressure inside the can until the end of seaming. How to tighten a 3-piece can body that is weak. 2) In a seaming device that double seams a three-piece can body with weak shaft strength between a lifter and a chuck and seams it with seaming rolls, the can body has a lid fitted into the upper opening of the can body. a compressed air supply path that supplies compressed air into the can body at a position where the lifter and the chuck start clamping the can body, and releases the compressed air inside the can body to the atmosphere at a position where the can body finishes seaming. A seaming device for a three-piece can with a weak shaft strength, characterized in that it is provided on the lifter.