JP2764852B2 - Top plate for square cans and method of manufacturing top plate for square cans - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a top plate for a square can and a method for manufacturing a top plate for a square can, which has a concave portion for winding and fastening to the edge of the can body of the square can.

[0002]

2. Description of the Related Art Conventionally, in a square top plate material 1 for a square can, in order to wind it around a can body, a concave portion 2 for winding around the entire outer peripheral portion,
3, 4, and 5 were formed. Since the recess for tightening is usually formed by pressing, the edge portions 2a, 3a, 4a, 5a
Was open outward (Fig. 2 (a)
(B)) When the formed square top plates 1 and 1 are stacked one on top of the other, the recesses for fastening are fitted to each other (FIG. 2 (b)),
There was a risk that it would not come off. Then, the curling roll processing machines 21 and 21 are connected to the top plate pressing device 20 (FIG. 5), and the top plate 1 is moved in the direction indicated by the arrow 25, and the top plate 1 is moved.
Are pressed against the edges 2a, 4a of the winding concavities 2, 4 on the two sides of the curling roll 21a, and the edges 2a, 4a are bent inward over the entire length to form the bent portions 22, 22. Thus, the square top plate 23 was formed (FIGS. 4A and 4B).
When the square top plates 23, 23 formed as described above are vertically stacked, the recesses do not fit each other (FIG. 4).
(C)).

[0003] In the above, the recess 2 of the top plate 1,
4, the top plate 1 is further moved in the direction of arrow 26 to form curling rolls 21b, 21b.
Similarly, the bent portion 2 is formed in the concave portions 3 and 5 on the other two sides of the top plate 1.
In some cases, 2, 22 were formed (FIG. 5).

[0004]

In the above prior art,
In the curling roll machine 21, the inflection point 2 of the corner portion is provided in order to provide the bent portion 22 over the entire length of the straight portion of the concave portion.
A bent portion 22 is formed in a part of the fourth and fourth parts 24. Therefore, at the inflection point 24, a deformation occurs due to an impact when the roll comes into contact with a boundary portion between the portion 24 b where the bent portion 22 is formed and the portion 24 a where the bent portion 22 is not formed, and the square top plate 23 is moved. There has been a problem that when the wire is wound around the can body, a defect occurs in the wound portion. In addition, since the curling roll processing machine 21 is large-sized, there is a problem of taking up space.

[0005]

However, the present invention has solved the above-mentioned problem by forming a projection which protrudes into a concave portion for winding.

That is, according to the present invention , a concave portion for winding which can be overlapped over the entire periphery of four sides of the outer peripheral portion is formed, and the outermost periphery of the concave portion is formed.
The edge located at is formed to open outward around the entire circumference
In the top plate material for a square can, a projection is formed on at least a part of a straight portion of an edge portion of the opposing side of the concavity for recess, which protrudes into the inside of the concavity for constriction. It is a top plate for a square can characterized by the above-mentioned.

Further, according to the present invention, a top plate material for a square can having a concavity for winding formed over the entire periphery of four sides of an outer peripheral portion is conveyed along two parallel guides, and A cusp is projected from the predetermined position on the top plate, and simultaneously or subsequently, a cusp is projected on the top plate from a predetermined position of the other guide, and a predetermined edge of the concave portion for tightening the top plate is formed. A method of manufacturing a top plate for a square can, characterized in that a protrusion projecting into the inside of the concave portion for winding is formed at a position.

[0008]

Since the projection is formed so as to protrude into the inside of the concave portion for winding, there is no possibility that the adjacent concave portions are fitted to each other when the top plate is vertically stacked and cannot be detached.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS.

[0010] Square top plate material 1 formed by a predetermined pressing process
Is a concave portion 2 for tightening over the entire periphery of four sides of the outer peripheral portion,
3, 4, and 5 are formed. The concave portions 2 to 5 have a shape in which the edge portions 2a to 5a are spread outward (FIG. 2A).
(B)).

In FIG. 3, the corner top plate 1 is placed on a base 6.
Guides 7 and 8 are installed at predetermined intervals according to the width of
Corresponding to the guides 7 and 8, a carry (chain or belt or the like) capable of transporting the square top plate 1 along the guides is attached. A protrusion forming tool 11 having cusps 9, 9 is movably attached to the base 6 along a guide 7. The protrusion forming tool 11 is such that the cusps 9, 9 face inward and the top plate 1
Are installed at positions that match the heights of the recesses 2 to 5 of FIG. Further, the protrusion forming tool 11 can be reciprocated by a cylinder, a solenoid or other moving means 19.

Further, a projection forming tool 11 with the cusp 10 facing inward is fixed to the base 6 along the guide 8 and opposed to the projection forming tool 11. The tip 10 protrudes inward from the inner surface 8 a of the guide 8.

The square top plate 1 is disposed between the guides 7 and 8, and the square top plate 1 is moved by a carry in the direction of the arrow 13.
When the square top 1 reaches the arrival sensor 17, a signal from the arrival sensor 17 causes the projection forming device 11 to move in the arrow 18 direction (direction of the square top 1) by the moving device 19.
The top plate 1 is pressed toward the opposing projection forming tool 11 to form projections 14, 14 inside the recess 2 by the cusps 9, 9 and inside the depression 4 by the cusps 10, 10. Protrusions 15, 15 are formed.

The square top plate 16 is formed as described above (FIGS. 1A, 1B, and 1C). The protrusion 14 and the protrusion 15
Are provided at positions facing each other. In addition, square top plate 16
Even when are stacked one on top of the other, there is no risk that the adjacent recesses will fit each other and will not come off (FIG. 1 (c)).

In the above-described embodiment, the projections are formed on the two opposite sides of the square top plate 1. However, the projections may be further formed on another one side or the other two sides. Further, in the above-described embodiment, two projections are provided on one side, but a desired effect can be obtained by forming at least one projection on at least two opposite sides. Further, in the above-described embodiment, the protrusions on the two sides are provided at positions facing the concave portions, but the positions where the protrusions are provided are arbitrary as long as they are linear portions of the concave portions of the square top plate 1.

In the above embodiment, one of the cusps 9
Although only the reciprocating movement is performed, both the cusps 9 and 11 may be reciprocated. That is, the protrusion forming tool 12 having the cusp 11 is fixed to the base 6, but is similar to the protrusion forming tool 10 in that the moving means is connected to allow reciprocation (not shown). ).

In the above embodiment, the protrusions 14, 1
5 were formed at the same time.
5 can also be formed. That is, the protrusion forming tool 12 is not installed at a position facing the protrusion forming tool 10, but is installed at a position shifted from the sensor 17 to a side farther than the sensor 17 by connecting the moving means (FIG. 3 chain line illustration).

[0018]

According to the present invention, the edge of the corner top plate is open outward.
Recesses on at least two opposing sides of a top plate material having a recessed recess
Since the formation of the projecting portion in a part of the straight portion of the edge, stacking
Efficiency without work interruption due to overlapping top plate recesses
There is an effect that good winding processing can be performed. In addition, the present invention
The square top plate should have a projection at a part of the straight line at the edge of the concave.
Can be achieved only with
There is fruit. Furthermore, only a part of the direct part of the edge of the concave
Since the inflection point is formed uniformly, when the square top plate of the present invention is wound around the can body, there is no possibility that a defect occurs in the wound portion, and a highly accurate can can be efficiently manufactured. There is an effect that can be done.

Further, since the projection can be formed only by installing the cusp on the transport guide, a curling roll processing machine is not required, and the installation space for the apparatus for manufacturing the square top plate can be reduced.

[Brief description of the drawings]

FIGS. 1A and 1B are plan views, FIG. 1B is a front view, and FIG. 1C is an enlarged cross-sectional view taken along line AA of FIG. 1A.

FIG. 2 shows a square top plate used in an embodiment of the present invention (a).
Is a plan view, and (b) is an enlarged cross-sectional view taken along line BB of (a).

FIG. 3 is a plan view illustrating a method according to an embodiment of the present invention.

4 (a) is a plan view, FIG. 4 (b) is an enlarged cross-sectional view taken along the line CC of FIG. 4 (a), and FIG. 4 (c) is an enlarged longitudinal section showing a state where the square tops are stacked. FIG.

FIG. 5 is a plan view of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Square top plate material 2-5 Concavity 7,8 Guide 9,10 Tip 11,12 Projection forming tool 14,15 Projection 16 Square top plate

Claims (2)

(57) [Claims] 1. An outer peripheral portion of an outer peripheral portion of a concave portion for winding which can be overlapped over the entire periphery of four sides of an outer peripheral portion.
There in heaven plate for corner cans is formed into a shape open to the outside over the entire circumference, a part of the straight portion of the edge of the recess for the tightening of the two sides at least facing the seaming A top plate for a square can, characterized in that a projection projecting into the inside of the recess is formed. 2. A top plate material for a square can having a concave portion for winding around the entire periphery of four sides of an outer peripheral portion is conveyed along two guides arranged in parallel, and from a predetermined position of said one guide, Protruding the cusp on the top plate, simultaneously or subsequently, protruding the cusp on the top plate from a predetermined position of the other guide,
A method for manufacturing a top plate for a square can, characterized in that a projection is formed at a predetermined position of an edge of the concave portion for tightening the top plate material so as to protrude inside the concave portion for tightening.