JPH0227945Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to an automatic seaming machine having a mechanism for preventing buckling of a can body that occurs when a can lid is seamed.

[Conventional technology]

To tighten the can lid and can body using a high-speed automatic seaming machine, refer to Figs. The can lid 5 is held between the chuck 1 which is frictionally engaged and the lifter plate 2 which is frictionally engaged with the bottom of the can body 6.
and the can body 6 (the can lid 5 is placed on the can body 6), and rotate it while applying pressure in the vertical direction.
Generally, the rolls 3 and 4 are brought closer to the chuck 1 to a certain size in the direction of the arrow, so that the flange portion of the can body 6 is wrapped around the periphery of the can lid 5 to form the chuck.

In addition, during this process, the lifter plate 2 is driven synchronously with the chuck 1 in the direction of the arrow so that the can body (referring to a can body with a can lid placed on it) is not suddenly rotated solely by the rotation of the chuck. It is also known to perform seaming using a forced drive type. This forced drive type drives both the chuck and lifter plate at all times during the seaming process, and as described in JP-A-56-163038, can body clamping pressure (lifter pressure) After the pressure has reached a predetermined level, during the seaming process, the driving force on the lifter plate side may be cut off using a clutch (friction clutch) with only the rotational drive of the chuck.

In either case, the chuck 1 and the lifter plate 2 are designed to have the same rotation speed through their respective rotation transmission mechanisms from the same drive source.

[Problem that the invention attempts to solve]

Among the forced drive type high-speed seaming machines mentioned above, in the case of the former (one that constantly drives both the chuck and lifter plate during the seaming process), the chuck 1
and lifter plate 2 rotate at the same rotational speed, but chuck 1 and lifter plate 2 rotate from the drive source.
There are several drive transmission devices in between,
Multiple gears are used in the transmission system, and each gear has a backlash (a gap created between the gear surfaces when a pair of gears is meshed) to ensure smooth rotation. 2 and 2 are rotated with minute fluctuations (uneven rotation) in their rotational speeds. Therefore, in the relative rotation between the chuck 1 and the lifter plate 2, a minute synchronization mismatch occurs instantaneously. When this slight synchronization mismatch occurs, a torsional force 8 is applied to the can body 6 held between the chuck 1 and the lifter plate 2, as shown in FIG.

Due to the generation of this torsional force 8, in addition to the vertical pressing force 7, a combined torsional force 8 acts on the can body 6, which may cause buckling of the can body 6. (Especially those with thin can body walls).

In the latter case (during the seaming process, the driving force on the lifter plate side is cut off by the clutch and only the chuck is rotationally driven), the lifter plate 2 and its support body whose driving force is cut off are tightened. During the process, this results in reverse driving through the can body.
The load of the transmitted force acts on the can body 6 as a torsional force, and as in the former case, the can body 6 may buckle. Furthermore, since no drive is transmitted from the lifter plate 2 during the seaming process, if the chuck 1 slips or the rolls 3 and 4 malfunction, the seaming process may not be completed without completing the specified seaming process. There is also the risk that the product could become a fatally defective product (slip cans).

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems and to provide a seaming machine that does not cause buckling of the can body by substantially eliminating the generation of the torsional force.

[Means of problem solving]

The present invention provides an automatic seaming machine that includes a chuck 1, a lifter plate 2, and seaming rolls 3 and 4, and has a chuck rotation transmission mechanism and a lifter plate rotation transmission mechanism. A method for preventing buckling of a can body, characterized in that either one of the directly connected rotating shafts and either the lifter plate main body or the rotating shaft directly connected to the lifter plate main body are each provided with a one-way clutch. This is an automatic seaming machine with a mechanism.

[Effect]

A one-way clutch is provided on either the chuck body or the rotating shaft directly connected to the chuck body, and on either the lifter plate body or the rotating shaft directly connected to the lifter plate body, so that the can lid can be attached to the can body. When tightening the chuck or lifter plate, if the rotational speed of the chuck or lifter plate fluctuates momentarily due to a minute gap between the transmission parts of the rotation transmission mechanism, for example, the rotational speed of the chuck may When the rotational speed of the lifter plate momentarily decreases, the one-way clutch provided on the chuck side loosens, and the one-way clutch remains loosened until the rotational speeds of both lifters return to a synchronized state. During this time, the can body is forcibly driven by the driving force on the lifter plate side, and when the rotational speeds of the two return to a synchronized state, the one-way clutch is locked again (reengaged), and the can body is forcibly driven from both sides.

Conversely, when the rotational speed of one chuck becomes higher than the other, the one-way clutch provided on the lifter plate side loosens and remains loosened until the rotational speeds of both chucks return to a synchronized state. During this time, the can body is forcibly driven by the driving force on the chuck side, and when the rotational speeds of both have returned to the synchronized state, the one-way clutch is locked again (reengaged), and both can bodies are forcibly driven.

On the other hand, the one-way clutches on both sides perform the same function as described above even in response to instantaneous fluctuations in the rotational speed of the lifter plate.

Therefore, even if the rotation speeds are uneven, the driving force on the slower side is always cut off, and the driving force on the faster side or the synchronized driving force on both sides is used to rotate the can body in one direction on both sides. The clutch acts and produces virtually no torsional forces on the can body.

〔Example〕

One embodiment of the present invention will be explained with reference to FIG.

In this figure, 1 is a chuck, 2 is a lifter plate, and 3 and 4 are seaming rolls, which are connected to a transmission part (gear) (not shown) of a rotation transmission mechanism (not shown) for the chuck 1 and lifter plate 2. The support shaft (rotation shaft) of chuck 1 and the support shaft (rotation shaft) of lifter plate 2 are each tightened using a known high-speed automatic seaming machine equipped with a minute gap (backlash) for smooth rotation. One-way clutches 9 and 10 are provided.

The one-way clutches 9 and 10 are roller clutches using cylindrical rollers and an inclined cam surface, and when the cylindrical rollers and the inclined cam surface rotate in the opposite direction, the engagement between the cylindrical roller and the inclined cam surface becomes loose and no driving force is transmitted. A directional clutch was used.

Using the high-speed automatic seaming machine with the above configuration, we can apply thin-walled can bodies with relatively low buckling strength (can bodies that do not buckle only with the clamping pressure between the chuck and lifter plate, but do buckle with the addition of torsional force). ) was used to seal and form can lids.

During this tightening process, when the rotational speed of the chuck 1 momentarily fluctuates and the speed decreases, the one-way clutch 9 provided on the chuck 1 side loosens, and the one-way clutch 9 provided on the lifter plate 2 side loosens. The clutch 10 continues to be in the locked state and can continue rotating at the previous rotational speed using only the driving force from the lifter plate 2 side, and since it does not receive the driving force from the chuck 1 side, the chuck 1 and the lifter plate No torsional force is generated on the can body which is held between the can body and the can body. Furthermore, even when the rotational speed of the lifter plate 2 instantaneously fluctuates in the direction of decreasing due to the rotation transmission mechanism of the lifter plate 2, the lifter plate 2
The locking of the one-way clutch 10 provided on the side is loosened, and the previous rotation is maintained with the same function as described above, eliminating the influence of the instantaneous relative rotational speed difference.

As a result, there was no buckling of the can body and no poor seaming.

Although the one-way clutches 9 and 10 are mounted on the support shafts of the chuck and lifter plate in this embodiment, they are not limited to this embodiment, and may be mounted at any position where the same function can be achieved. For example, it may be directly incorporated into the chuck or lifter plate.

[Effect of idea]

The present invention is designed to substantially eliminate torsional force 8 applied to the can body 6 when the can lid 5 is wrapped around the can body 6, and to apply it to both the chuck 1 and the lifter plate 2, or to the By having a structure in which each of the drive mechanisms is provided with one-way clutches 9 and 10, when the rotational speed of the chuck 1 or the lifter plate 2 changes, the driving force of either the chuck 1 or the lifter plate 2 on the high speed side is reduced. is transmitted to the can body, eliminating the influence of instantaneously occurring relative rotational speed differences caused by bumps in the drive system, etc., and virtually not applying any torsional force to the can body. Therefore, seaming can be performed without producing buckled cans or slip cans.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram showing the structure of the present invention in which the chuck, lifter plate seaming roll, can lid, and can body are spaced apart, and Fig. 2 shows the chuck, lifter plate, and seaming roll of the conventional device. , a side view of the can lid and the can body when being tightened, and FIG. 3 are explanatory diagrams showing an example of the present invention in which one-way clutches are installed on the support shafts of the chuck and lifter plate, respectively. 1...chuck, 2...lifter plate,
3, 4... Sealing roll, 5... Can lid, 6... Can body, 7... Pressure force between the lid and body, 8... Torsional force of can body, 9... One-way clutch of chuck, 10...
…One-way clutch of lifter plate.

Claims (1)

[Claims for Utility Model Registration] In an automatic seaming machine comprising a chuck, a lifter plate, and a seaming roll, and a rotation transmission mechanism for the chuck and a rotation transmission mechanism for the lifter plate, the chuck body or the chuck An automatic seaming machine characterized in that either one of the rotating shafts directly connected to the main body and one of the lifter plate main body or the rotating shaft directly connected to the lifter plate main body are each provided with a one-way clutch. .