JPS587919B2 - How to install the inner plug of a paper tube for squirting toy fireworks - Google Patents

Description

[Detailed Description of the Invention] The present invention particularly relates to a method for attaching an inner frame to a paper tube used in toy fireworks that spout flames and smoke, and allows the inner plug to be extremely efficiently fixed inside the paper tube. It is characterized by the following.

Conventionally, paper tubes for this kind of squirt toy fireworks are filled with red clay to seal the gunpowder filled in the paper tube, and a small hole is passed through the center of this red clay layer for the fuse to pass through. Paper is pasted to the bottom of the red clay layer to temporarily seal the small hole.

This red clay filling work and paper pasting are all done by hand, which is extremely time-consuming, resulting in low productivity and high costs.

In order to solve the drawbacks of the conventional method, the present invention fixes a large number of paper tubes together in a lined state, and the inner stopper for these paper tube groups is attached to a single piece of cardboard. The inner plugs are inserted into the paper tubes by a press operation or the like, and inner plugs are inserted into the paper tubes at the same time, with a portion left open so that a large number of paper tubes can be easily punched out. It is designed to be installed.

Embodiments of the present invention will be described below in detail based on the drawings. In FIGS. 1 and 2, 1, 1... are paper tubes having a constant diameter and length and formed into a cylindrical shape from cardboard or the like. ,
A large number of the paper tubes are arranged so that their outer circumferential sides are in contact with each other, and are tied tightly with a band 2 to temporarily collect and fix them in a substantially hexagonal shape when viewed from above to form a paper tube group a.

In FIG. 3, reference numeral 3 denotes a hexagonal cardboard with a planar area slightly larger than that of the front paper tube group a, and the paper tubes 1, 1, . . . Circular cutout lines 4, 4, which correspond to each other and have a diameter slightly larger than the inner diameter of the paper tube 1, are provided in a state where they are temporarily fixed so as not to fall off from the cardboard 3, leaving a part of each. Stopper 5, 5...
A small hole 6, 6, . A thin paper 7 of approximately the same size as the cardboard 3 is pasted to temporarily seal the small holes 6, 6 to form the inner plug group b.

In FIG. 5, 8 indicates each paper tube 1 of the paper tube group a on the substrate 9.
, 1 . . . , a lower mold having protrusions 10, 10 . 10.10... are formed by protruding protrusions 13, 13... corresponding to the paper tubes 1, 1... of the paper tube group a on the protrusions 10.10... of the lower die 8.
, and place the inner stopper group b on this paper tube group a with the thin paper 7 facing downward so that each inner stopper 5, 5... is positioned above each paper tube 1, 1..., and then the upper mold 11, each inner plug 5,5 is removed from the inner plug group b by the protrusion 13.13 as shown in FIG.
... are punched out and inserted into the paper tubes 1, 1..., received on the protrusions 10, 10... of the lower mold 8, and fixed at a constant height position of the paper tubes 1, 1..., respectively. be able to.

Next, the paper tube group a into which the inner plugs 5, 5, etc. were inserted like this
are taken out from the lower mold 8 and upper mold 11, and water-soluble adhesive is sprayed from above in the assembled state shown in FIG.
5... are fixed to the paper tubes 1, 1..., respectively.

The diameter of each inner plug 5 is slightly larger than the inner diameter of the paper tube 1, for example, 0.5 to 0. By forming it 6 mm larger, the circumferential edge is slightly bent and expanded when it is inserted into the paper tube as shown in Figure 9, and it can be firmly fixed by sliding strongly against the inner wall of the paper tube. It is convenient because it can improve stability during filling.

In order to fit the middle parts 5, 5... into the paper tubes 1, 1... described above, the lower die 8 is attached and fixed to the die holder using a well-known press machine, and the upper die 11 is attached to the shank. A paper tube group a is attached to the lower die 8 so that it can be moved up and down, and the inner plug group b placed thereon is provided with a notch 14 on one side edge as shown in FIGS. 3 and 4. By engaging the notch 14 with a die holder or a stopper provided on one side of the lower die 8, each paper tube 1, 1... and the inner stopper 5, 5... are positioned so that they match, and the upper die 11 is If the shank is driven to move it up and down, work efficiency can be further improved.

As is clear from the above description of the embodiments, the present invention provides a structure in which a large number of paper tubes are temporarily assembled and fixed to form a paper tube group, and a protrusion is provided that reaches a certain height position on each paper tube. A group of inner plugs is placed on the paper tube group, in which inner plugs are formed by placing the inner plugs in corresponding positions to the paper tubes on cardboard of approximately the same size as the paper tube group, and the inner plug group is placed on the lower mold. The inner frame is attached to a large number of paper tubes at the same time by fitting the inner plug into each paper tube by pressing with a pair of upper molds and fixing the inner plug by spraying adhesive. This dramatically improves efficiency compared to the conventional method of manually attaching each piece one by one.Furthermore, the installation depth position can be kept constant, eliminating variations in quality. It can be made without.

Furthermore, formed of cardboard according to the method of the present invention,
With inner plugs in which the small hole through which the fuse is inserted is temporarily sealed with thin paper on the underside, when inserting the fuse after filling the paper tube with gunpowder, it is difficult to insert the fuse as the hole is exposed on the surface. Furthermore, since the thin paper that temporarily seals the small hole can be torn by simply inserting the fuse, it has the advantage of making the process of attaching the fuse more efficient, and can also contribute to improving the efficiency of the firework manufacturing process. It is something.

[Brief explanation of the drawing]

The drawings are for showing an embodiment of the present invention, and FIG. 1 is a perspective view of the paper tube group, FIG. 2 is a plan view of the same as above, FIG. 3 is a plan view of the inner stopper group, and FIG. 4 is a back view of the same as above. , Figures 5 and 6 are cross-sectional views for explaining how the inner plug is inserted into the paper tube, Figure 7 is a plan view of the paper tube group with the inner frame fitted, and Figure 8 is a diagram showing the inner plug inserted. FIG. 9 is a perspective view of the expanded paper tube, and a vertical cross-sectional view of the same. 1,1...paper tube, 3...cardboard, 5,5...inner stopper, 6,6
...Small hole, 7...Thin paper, 8...Lower mold, 10, 10...Protrusion, 11...Upper mold, 13.13...Protrusion, a...Paper tube group, b...Middle frame group.

Claims (1)

[Scope of Claims] 1. A paper tube group is formed by temporarily gathering and fixing a large number of paper tubes having a certain length and diameter by, for example, tightening them, and on the other hand, a cardboard is provided with a corresponding paper tube in the paper tube group. A large number of inner plugs are formed by cutting into a punchable state, leaving a part at the position where the inner plugs are formed, and each of the inner plugs is made with a small hole, and each of the small holes is closed with thin paper to form a group of inner plugs. The paper tube group is mounted on a lower mold provided with protrusions that reach an arbitrary height position of each paper tube, and the paper tube group is mounted so that each inner stopper matches the respective paper tube. After that, from above with an upper mold equipped with protrusions corresponding to the lower mold,
By pressing, each inner plug is punched out from the inner plug group and inserted into the paper tube to a certain position, and then adhesive is applied to the top surface of the inner plug that has been fitted into the paper tube to fix the inner plug to the paper tube. A method for attaching an inner stopper to a paper tube for squirting toy fireworks, characterized by the following: 2. A method for attaching an inner stopper to a paper tube for squirt toy fireworks according to claim 1, wherein the diameter of the inner stopper is formed to be slightly larger than the inner diameter of the paper tube.