JPH0247301B2 - - Google Patents

Description

[Detailed description of the invention] Industrial applications The present invention relates to a can tightening method and apparatus.

Conventional technology A conventional can tightening device places a lid on a can filled with contents by a can feed turret, and then moves the lid to the center of a lifter plate using a can feed turret and a seamer turret. The knock-out pad, which is positioned above and then vertically movably fitted into the seaming chuck, descends and engages the lid, and the can is held between the knock-out pad and the lifter and the can is sealed. The can is guided to the closing chuck and chucked, and then the can is held with a predetermined lifter pressure to perform double seaming.

Problems to be Solved by the Invention As described above, when tightening the can, the can is held between the chuck and the lifter using lifter pressure that can counteract the seaming pressure. Therefore, if the lid is not chucked correctly, an uneven load will be applied to the case, which may cause the case to buckle. In particular, a case made of a flexible material such as aluminum, plastic, paper, or a composite material thereof can easily buckle even if the centering is slightly misaligned. It is therefore necessary, especially in the case of housings made of flexible materials, that the centering of the housing on the seaming chuck is done correctly.

However, as seaming speeds have recently increased, the casing placed on the lifter plate becomes eccentric due to the centrifugal force caused by the high speed rotation of the lifter during the lifting process, making it difficult for the lid to properly fit into the chuck. Not having problems. This is due to the difficulty of centering when chucking a can lid that is rotating at high speed, and is a problem that the prior art basically cannot avoid. In addition, in the conventional method, seaming is performed by applying lifter pressure at the same time as chuckling, so there is no time to self-correct the center ring misalignment, and the seaming continues as it is, resulting in poor seaming. It will wake you up.

The present invention has been devised in view of the above-mentioned drawbacks of the prior art, and its purpose is to be able to chuck the can lid without causing it to be eccentric to the seaming chuck even when tightening quickly. The object of the present invention is to provide a new can wrapping method and device that can tighten the can while preventing buckling of the can.

Means for Solving the Problems The present invention eliminates the conventional method in which the can lid is placed over the can body and rotates at high speed to rise and fit into the seaming chuck, and the seaming chuck is removed from the turret. A new method was discovered and completed in which chucking can be performed without eccentricity by directly adsorbing the can lid and then covering the can body with the can lid.

Hereinafter, the configuration of the present invention will be explained with reference to drawings of embodiments.

The first invention of the present application is a can tightening method, which includes a step in which a seaming chuck 12 adsorbs a can lid 15, and a step in which the seaming chuck 12 is lowered to attach the can lid 15 to a container containing contents. a step of fitting the can into the opening of the seaming chuck 16 and sandwiching the can between the seaming chuck 12 and the lifter 17;
2 and the lifter 17 rise in synchronization to guide the can to the seaming position, the seaming roll 18,
19, and a step in which the seaming chuck 12 and the lifter 17 descend synchronously to blow out air from the seaming chuck 12 to release the can after seaming. It is characterized by:

The second invention of the present application is a can seaming device for carrying out the method of the invention, in which a can is sandwiched between a seaming chuck 12 and a lifter 17 and double wrapped by seaming rolls 18 and 19. In the can tightening device, the seaming chuck 12
It has a can lid adsorption/removal means that suctions and holds the can lid 15 with a vacuum and releases the suctioned can lid by blowing out air at the position where the seaming chuck is lowered after seaming is completed, and It is characterized in that it is moved up and down by a dynamic drive means, and the can lid is moved up and down by holding the can between it and a lifter before and after seaming.

Function The seaming chuck adsorbs and chucks the can lid conveyed by the turret after releasing the can which has been seamed in the previous seaming process. When the seaming turret rotates and reaches a position where the case is placed on the lifter, the seaming chuck is lowered to cover the case opening with the seaming chuck. Thereafter, the lifter and seaming chuck move up to the seaming position with the can sandwiched between them, and seaming is performed by the seaming roll. When seaming is completed, the lifter and seaming chuck descend in synchronization, and the seaming chuck releases the suction of the can lid by the vacuum, and at the same time blows out air to remove the seaming chuck from the seaming chuck. Forced to leave Tsuku. This prevents defective release due to the can lid seam biting into the seaming chuck, and allows the can to be smoothly discharged.

Embodiments Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a schematic explanatory diagram of one embodiment of a seaming device according to the present invention. In the figure, reference numeral 1 denotes a seaming turret, and semicircular fitting recesses 2 into which the can body of the can to be seamed fit are formed at equal intervals on the outer periphery of the turret. seaming turret 1
Above and below, a seaming chuck device 10 and a lifter 17 are provided corresponding to each of the fitting recesses 2, as shown in FIG. 2, and these rotate integrally with the seaming turret. At the same time, it rotates. Reference numeral 3 denotes a supply turret, and fitting recesses 4 are formed on the outer periphery of the supply turret at the same pitch as the fitting recesses 2 of the seaming turret. Reference numeral 5 denotes a discharge turret, which discharges the seamed can from the seaming turret 1 and also serves to supply the can lid 15 to the seaming chuck. The discharge turret is also formed with a fitting recess 6, similar to each of the turrets described above. In addition, in FIG. 1, 7 is a supply conveyor, and 8 is a discharge conveyor.

The seaming chuck device 10 is constructed by fixing a seaming chuck 12 to the lower end of a chuck rod 11, as shown in FIG. The chuck rod 11 is rotatably and vertically movably attached to a seaming head (not shown).
The vertical movement of the chuck rod 11 is controlled by a suitable driving means such as a chuck cam.
A ventilation hole 13 is provided through the center of the chuck rod 11, its lower end penetrates into the seaming chuck, and its upper end is connected to an air supply/exhaust device (not shown) to constitute a can lid adsorption/removal means. ing.

A method of seaming a can using the seaming device configured as described above will be explained with reference to FIG. In addition,
The sub-views a to g in FIG. 2 show the order of the seaming process and correspond to the positions a to g in FIG. 1.

The container filled with the contents in the filling line is conveyed to the seaming device by the supply conveyor 7 (position shown in Fig. 2 a), and when it reaches the position of the supply turret 3, it is seamed with the supply turret 3. It is rolled up in the fitting recess of the turret 1 and transferred onto the lifter plate 17 (b). At this point, the seaming chuck 1
The can lid 15 is attached to the can lid 1 by suction, and the seaming chuck has started to descend. When the turrets 1 and 3 rotate further and the fitting recess into which the housing 16 is fitted reaches the center line of both turrets, the housing 16 is positioned at the center of the lifter plate 17. At the same time, the seaming chuck also completes its lowering, and the can lid adsorbed to the seaming chuck matches the can opening of the can body and covers the can body, and the lifter 17 and the seaming chuck 12
Press down on the casing with (c). From this state, lifter 1
7 and the seaming chuck device 10 rise in synchronization, guide the can until the seaming portion reaches the processing position by the seaming roll, and hold the can with a predetermined lifter pressure (d). Note that, up to this point, the first seaming roll 18 and the second seaming roll 19 have been retracted to the left and right.

Thereafter, double seaming is performed using the first seaming roll 18 and the second seaming roll 19 in the same manner as in the conventional method. When the seaming is completed, the seaming rolls 18 and 19 are retracted to the left and right.
(e) The seaming chuck 12 and lifter 17 descend in synchronization. When the seaming chuck 12 reaches the lowest position, the seaming chuck 12
Air is blown through the vent hole 13, and the lifter 17 sucks the bottom of the case with a vacuum.
(f). This releases the can from the seaming chuck 12 and holds the can on the lifter plate 17.
The seaming chuck 12 rises. Fitting recess 2 between seaming turret 1 and discharge turret 5,
6 reaches the center line of both turrets 2 and 5, the seaming chuck 12 suctions the can lid on the fitting recess 6 of the discharge turret 5 with the vacuum, and the can lid is attached to the seaming chuck. Checking is carried out to prepare for the next can tightening.
At the same time, the can under which the seaming has been completed is transferred by the discharge turret 5 to the discharge conveyor 8 and discharged from the apparatus (g).

High-speed seaming is performed continuously by repeating the above steps.

In addition, in the above embodiment, the lid was attached to the seaming chuck using a vacuum, but
In the case of a lid made of a magnetic material such as tinplate, the attraction means may be an electromagnet. Further, the arrangement angle of each turret is not limited to that shown in FIG. 1, but can be changed as appropriate.

Effects As described above, according to the present invention, unlike conventional seaming devices, the seaming chuck sucks the lid directly from above the turret.
The center does not shift due to the high-speed rotation of the lifter as in the past, and chucking is performed correctly. Also, unlike the conventional method where seaming is done almost simultaneously with the seaming chuck, the lid is chucked in advance, so there is plenty of time even when seaming at high speed. You can play stably. Furthermore, the seaming chuck moves up and down to guide the can, and the suction and removal means uses vacuum and air to blow out air to attach and remove the can lid after seaming, ensuring reliable operation. Even after seaming is completed, there will be no failure to remove the can.

[Brief explanation of the drawing]

The drawings show an embodiment of the device of the present invention,
FIG. 1 is a schematic plan view thereof, and FIGS. 2 a to 2 g are side views of the main parts shown in the order of the seaming process. 1: Seaming turret, 2, 4, 6: Fitting recess, 3: Supply turret, 5: Discharge turret, 7: Supply conveyor, 8: Discharge conveyor, 1
0: seaming chuck device, 11: chuck rod, 12: seaming chuck, 13: vent, 15: can lid, 16: housing, 17: lifter,
18, 19: Seaming roll.

Claims (1)

[Scope of Claims] 1. A step in which a can lid is attached to a seaming chuck, the seaming chuck being lowered to fit the can lid into the opening of the can with contents, and the seaming chuck being attached to the can lid. a step of holding the can with a lifter; a step of raising the seaming chuck and the lifter in synchronization to guide the can to a seaming position; a step of seaming the can with a seaming roll; and a step of seaming. A can seaming method comprising the steps of lowering the chuck and the lifter in synchronism, blowing out air from the seaming chuck, and separating the seaming completed can from the seaming chuck. 2. In a can seaming device that clamps a can between a seaming chuck and a lifter and double seams it with a seaming roll, the seaming chuck holds the can lid by adsorption with a vacuum, and also seams the can lid with a vacuum roll. It has a can lid adsorption/removal means that blows out air at the lowered position of the seaming chuck to release the adsorbed can lid, and is moved up and down by a vertical movement drive means to act as a lifter before and after seaming. A can tightening device characterized by holding the can between the cans and moving the can up and down.