JPS632770B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a lip curl device, and more specifically, it is an easy-to-use device that is easy to use and has a good finish. trying to provide something.

Conventionally, the outer periphery of paper or synthetic resin sheet containers, etc., has been rolled up to form a bead shape, and the lip curl device used for the above processing has a spiral lip groove. A container to be processed is inserted between the three forming rolls, the forming rolls are rotated, and the container is rotated along the lip groove in the direction of the roll axis while the outer periphery of the container is inserted into the lip groove. The edges are lip-curled in accordance with the groove shape.

However, when a foamed resin sheet is used as the material for the container, the container tends to come off the spiral lip groove in the above device, and if the container itself is not formed accurately, there is a risk of variations in the finish of the lip curl process. In addition, since it is necessary to heat the foam sheet that is the raw material during processing, the forming roll that also serves as a heating member must be rotated at low speed to slowly move the container, which has the disadvantage that processing time is longer and the entire forming roll becomes longer. Ta. Furthermore, it is difficult to form a spiral lip groove, and it is difficult to easily adapt to changes in the shape of the container, resulting in poor flexibility.

Therefore, the present invention provides a rip-curl device for foam sheet containers that has been used very frequently in recent years, which can solve the above-mentioned conventional drawbacks and is convenient. The plurality of forming rolls arranged to be freely movable in the radial direction include a fixed member that has a step and is rotatable, and a movable member that rotates together with the fixed member and is also slidable in the axial direction. provided, so that a lip groove is formed between a press mold formed at the tip of the movable member facing the step and the step of the fixed member, and as the forming roll moves toward the container, The outer peripheral edge of the container is held in contact with the lip groove, so that the outer peripheral edge of the container can be subjected to a lip curling process.

Next, embodiments of the present invention will be illustrated below with reference to the drawings.

Four forming rolls 2 are arranged parallel to each other radially in all directions surrounding the central container insertion position of the apparatus main body 1, and each forming roll 2 is supported by two bearing members 3, 3. There is. The bearing member 3 is fitted into a sliding groove 10 formed radially in the radial direction toward the center of the device main body 1, and the bearing members 3,
The forming rolls 2 between them are movable in the radial direction toward the center of the apparatus.

A chain sprocket 20 is attached to the end of each forming roll 2 so that all forming rolls 2 can be rotated simultaneously by a drive mechanism such as a series of chains 21. 4 is an idler shaft, and similarly to the above-mentioned forming roll 2, bearing members 3',
3' so as to be movable in the radial direction.
The chain 2 is attached to the sliding groove 10 of the device body 1 and is generated when the forming roll 2 moves in the radial direction.
1 slack can be absorbed and adjusted by moving the sprocket 40. 30' is idler shaft 4
This is a handle for operation (see Figure 1).

Next, the structure of the forming roll 2 will be described.
is a fixed member with a stepped portion 60, which is directly connected to the sprocket 20 so that it can rotate. Reference numeral 7 designates a movable member, which is formed so that a central fitting recess 71 meshes with a fitting convex portion 61 of the fixed member 6 so that it can rotate at the same time and is independently slidable in the axial direction. (See Figure 4).

The distal end of the movable member 7 facing the stepped portion 60 of the fixed member 6 is used as a press mold 70, and the stepped portion 60
The outer peripheral edge of the container can be fitted into the lip groove L formed by the push die 70, and by moving the moving member 7, that is, the push die 70 in the axial direction, the width of the lip groove L can be changed. It is made changeable, and the rip curl process is performed using this press die 70.

As a mechanism for sliding the moving member 7, there are two thrust bearings 80 at the end of the moving member 7, front and rear.
By moving the groove width adjustment shaft 8 fitted through the groove width adjusting shaft 8 in the axial direction, the moving member 7 can be slid back and forth in the axial direction while rotating. It is a handle (Fig. 2, 3)
(see figure).

Note that 62 is a cavity formed in the fixing member 6 for heating the forming roller 2, and is designed to allow introduction of a heating medium such as oil, but it is also possible to embed an electric heater directly inside the forming roller 2. It is. In addition to the above-mentioned four, the number of forming rolls 2 may be three or five or more, but it may be necessary to maintain the container evenly, workability or heatability, and reduce the manufacturing cost of the device. From this point of view, the four roll roll shown in the figure is most suitable.

Furthermore, the movement of the forming roller 2 in the radial direction and the sliding of the moving member 7 in the axial direction are performed manually using handles 30, 30', and 81, but they may be changed to a cylinder mechanism or other known mechanism. Moreover, if the movement of each member is automated, efficient processing can be performed. In particular, it is preferable to make it possible to move a plurality of forming rollers 2 in the radial direction at the same time, since this makes the work easier.

Next, to describe the use of the above device, first, the container A used in this device is a cup-shaped container molded from an expandable thermoplastic resin sheet such as expanded polystyrene.
It is assumed that the container is bent in advance toward the lower side of the container (see Fig. 2).

After inserting the container A into the center of the device, operate the handle 30 to move the surrounding forming rolls 2 toward the center and insert the container A into the lip groove L of the forming roll 2.
The outer peripheral edge a of the holder is held in contact with the outer peripheral edge a of the Note that each forming roll 2 is moved by the same amount by operating the handle 30 so that the container A can be held evenly in the center of each forming roll 2. Also handle 30'
is operated to move the idler shaft 5 outward in the opposite direction to each forming roll 2 so that the chain 21 meshed with each sprocket 20 does not loosen and adjusts so that all forming rolls 2 rotate synchronously.

Next, when the handle 81 is operated to gradually move each moving part slope 7 toward the stepped part 60 side of the fixed member 6, the press mold 70 at the tip of the moving member 7 bends and deforms the outer peripheral edge a of the container. It is then molded into the desired lip shape (see Figure 3).

During the above process, the forming roll 2 is heated to an appropriate temperature so that the foamed resin container A can be easily formed.

When changing the lip shape of the container A, various lip shapes can be produced by simply replacing the pressing die 70 with another movable member 7 of a different shape (see Figures 5 [ ] to [ ]), and the fixing member 6 etc. can also be shared.

Next, the modified example shown in FIGS. 6 and 7 is one in which a large number of containers A can be lip-curled at the same time, and the bearing member 3 and other basic structures are the same as those of the previous embodiment, The only difference is in the shapes of the fixed member 6 and the movable member 7.

That is, in order to form a plurality of lip grooves L,
A plurality of fixed members 6a, 6b and a moving member 7a,
7b are successively connected. Of these, the fixing member 6a, which is the drive mechanism side to which the sprocket 20 etc. are connected, has a connecting square column part 63 having a heating cavity 62 inside, and half-moon-shaped convex parts 64 on both sides thereof.
The movable member 7a adjacent to the fixed member 6a has a recess 72 that slidably engages with the semicircular convex portion 64, and a recess 72 whose inner surface abuts two sides of the prismatic portion 63 and is connected to the outer surface. Two connecting pieces 73, upper and lower, each having a step 74 are formed, and one lip groove L is formed by the press die 70 at the tip of the moving member 7a and the step 60 of the fixed member 6a.

Next, the fixed member 6b adjacent to the moving member 7a
A connecting piece insertion hole 65 and half-moon-shaped protrusions 64, 64 are formed in the connecting piece insertion hole 65, and the half-moon-shaped protrusion 64 is slidably fitted to the movable member 7a, and the half-moon-shaped protrusion 64 is fixed to the fixed member 6a with a screw B. There is. Furthermore, this fixing member 6
The movable member 7b adjacent to b has a recess 72 that slidably engages with the half-moon-shaped protrusion 64 of the fixed member 6b.
Then, the two upper and lower connecting pieces 73' whose inner surfaces become step portions 75 that come into contact with the two sides of the prismatic portion 63 and the step portions 74 of the connecting pieces 73 formed on the moving member 7a, and whose outer surfaces form the connecting step portions 74. , 73' are formed, and the step portion 75 of the connecting pieces 73', 73' is connected to the moving member 7a.
Screw B is fixed to the connecting pieces 73, 73 of
One lip groove L is formed by the stepped portion 60 of the fixed member 6b and the press die 70 at the tip of the movable member 7b.

Therefore, by extending the prismatic portion 63 of the fixed member 6a and connecting the fixed member 6b and the movable member 7b one after another, an arbitrary number of lip grooves L can be formed, and in the case of the figure, there are two sets. fixing member 6b
In this example, the moving member 7b is connected and a total of three lip grooves L are provided. Furthermore, 76
is an end member B screwed to the connecting piece 73' of the movable member 7b, and if the groove width adjustment shaft 8 is connected to this end member 76 via a thrust bearing 80 or the like similar to the above-mentioned embodiment, they can be moved to each other. A plurality of connected moving members 7a, 7b... can be simultaneously moved in the axial direction while being rotated.

Moreover, at this time, since the fixed members 6a, 6b, . . . are fixed to each other by screws B to the square column portion 63, they rotate at a fixed position independently of the movable members 7a, 7b.

The spacing between the lip grooves L and L is such that the outer periphery a of each container A can be inserted into each lip groove L as is, while a large number of containers A to be processed are stacked one on top of the other. This makes the work easier (see Figure 7).

According to the above modification, a large number of containers A can be lip-curled at the same time, and the number of lip grooves L can be easily changed as needed. It is not difficult to change the pitch of each moving member 7a, 7.
By adjusting the screwing positions of the fixing member 6b and the fixing member 6b, the gap between the lip grooves L and L can be easily changed in accordance with the stack height of the containers A, resulting in extremely high flexibility.

According to the device of the present invention constructed as described above, compared to the conventional method in which the container is processed while being fed forward through a spiral lip groove, the outer peripheral edge of the container is processed in a fixed position. It is difficult to come off from the lip groove, and there are fewer machining defects.

In addition, in the conventional method, the roll rotation speed was slow due to restrictions on heating properties and roll length, resulting in a long forming time.However, according to this invention, the roll rotation speed can be freely selected, and the forming time is increased by high-speed rotation. The process can be shortened, the molded product can be finished well, stable processing can be performed with little variation, and the heating time can be set freely.

Regarding the size of the container, conventionally it was only possible to process containers with a diameter of 55φ to 105φ due to the structure of the forming rolls, but with the device of this invention, it is possible to process containers of any size by moving each forming roll in the radial direction. It was confirmed that it can be easily applied to containers with a diameter of 50φ to 200φ, for example.

In addition, since the forming rolls are movable in the radial direction, the container can be reliably held between a plurality of forming rolls, and in this state, the moving member is moved to abut the press die against the outer periphery of the container, causing lip curling. Because it is a machine that undergoes processing, it can be processed accurately and without applying excessive force, resulting in a product with a very good finish. The outbreak will completely stop.

The fixed member and movable member that make up the lip groove have a relatively simple structure and are easy to manufacture, and there is no need to replace the entire forming roll, and various lip shapes can be accommodated simply by changing the fixed member and movable member. Compared to conventional forming rolls having spiral lip grooves, the overall cost of the apparatus is much cheaper and more convenient.

Therefore, we have created an excellent device that has many features, such as being able to perform lip-curl processing on foamed resin containers of various shapes and sizes, with good finishing quality, and the cost of the device itself being low. This is something that can be provided.

[Brief explanation of the drawing]

The drawings illustrate an embodiment of the present invention, and FIG. 1 is a front view, FIG. 2 is a partial sectional view taken along the front line, FIG. 3 is a partially enlarged sectional view of a forming roll, and FIG. The figure is a sectional view taken from the previous figure, and Figures 5 [] to [] are partial sectional views of the processed container.
FIG. 6 is an exploded parts view of a modified example, and FIG. 7 is an assembled sectional view. DESCRIPTION OF SYMBOLS 1... Apparatus main body, 2... Forming roll, 6... Fixed member, 60... Step part, 7... Moving member, 70... Press mold,
A...Container, a...Outer periphery, L...Rip groove.

Claims (1)

[Scope of Claims] 1. A plurality of forming rolls disposed so as to be movable in a radial direction from the center of the device include a rotatable fixing member having a stepped portion, and a rotatable fixing member that rotates together with the fixing member, and A movable member that is also slidable in the axial direction is provided, and a lip groove is formed between the press die formed at the tip of the movable member facing the step portion and the step portion of the fixed member. A rip-curl device characterized in that as the forming roll moves toward the container, the outer peripheral edge of the container is held in contact with the lip groove, so that a rip-curl process can be applied to the outer peripheral edge of the container. 2. The rip curl device according to claim 1, wherein four forming rolls are arranged on each side. 3. The lip curl device according to claim 1, wherein a plurality of fixed members and movable members are arranged side by side in the axial direction, and the plurality of movable members are made slidable at the same time.