JPS5837892Y2 - Base for paper tube - Google Patents

Description

[Detailed description of the invention] This invention relates to a cap that is attached to both ends of a paper tube.

At both ends of the paper tube, which serves as the axis of the roll paper, fittings are fitted and set to fit the rotating shaft of the mill stand.

Conventionally, the above-mentioned cap is composed of an annular end plate, and an inner cylinder and an outer cylinder that are connected from the inner and outer peripheries of this end plate and protrude to one side of the end plate, and the cap is fitted onto a paper tube. after,
The diameter of the inner cylinder is enlarged, and the diameter of the outer cylinder is reduced, and the opening edges of the inner cylinder and outer cylinder are assembled into a paper tube and attached to the paper tube.

In this case, there is a difference in level between the outer periphery of the paper tube and the external part of the cap, which creates wrinkles within the length range from the beginning of the winding of the paper tube, which has the disadvantage that it cannot be used until near the final end of the paper tube. there were.

In view of the above points, recently, a cap with only an inner cylinder having a flange on the outer end has been used. If only one strip was used, it could not be firmly fixed, and there was a drawback that the cap would slip or fall off.

Therefore, a V-shaped slit was made in the inner cylinder, and the left side of the nail was bitten into the paper tube while the inside of this slit was bent inward by a press.

In this case, there was a drawback that it was time-consuming.

The purpose of this invention was to stack the cylinders along the axis of the outer periphery in contact with the inner peripheral surface of the paper tube, fix the belt-shaped steel plate for the key by spot welding, and make the steel plate protrude from the other end of the cylinder. To provide a cap which is provided with a biting claw to prevent slippage.

Hereinafter, embodiments of this invention will be described based on the accompanying drawings.

In the figure, A is a metal cap that is set at both ends of a paper tube B, and this cap A is attached to a cylinder 2 having a flange 1 at one end, and at a predetermined position on the outer peripheral surface of this cylinder 2. It is composed of a belt-shaped steel plate 3 for a key which is overlapped along the axial direction of the cylinder body 2 and fixed by spot welding.

Further, by providing the hook pawl 4 at the end of the steel plate 3, the cap A can be fixed even more reliably by the steel plate 3 and the hook pawl 4.

Taking into consideration the above-mentioned structure, the cap according to this invention is attached to the paper tube by aligning the edges of the cylinder 2 with the openings at both ends of the paper tube B, and then using a press or the like to attach the cap. BK
The cylindrical body 2 is inserted and the diameter of the cylindrical body 2 is expanded.

At this time, the key strip steel plate 3 bites into the inner peripheral surface of the paper tube B.

The hook claw 4 also bites into the paper tube B. As described above, according to the paper tube cap according to the present invention, since there is no outer cylinder circumscribing the outer periphery of the paper tube on the outer periphery of the flange, the outer periphery of the paper tube becomes flat.

Therefore, it is possible to eliminate the conventional problem of wrinkles occurring due to the difference in level between the outer tube and the paper tube.

In addition, belt-shaped steel plates for keys are stacked along the axial direction at required positions on the outer circumferential surface of the cylinder and are fixed by spot welding, so that the steel plates bite into the inner circumferential surface of the paper tube.

Therefore, it is possible to prevent the cap from falling off the paper tube, and also to eliminate slippage in the rotational direction by the belt-shaped steel plate for the key.

In particular, since we use a belt-shaped steel plate for keys to stop rotation,
The side edge of the steel plate bites and locks into the inner periphery of the paper tube, effectively stopping rotation.

In the past, the hook pawls were bitten to prevent the cap from falling off.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of the cap according to this invention, and FIG. 2 is a longitudinal sectional front view showing the installation state of the same. A...cap, B...paper tube, 1...flange, 2...
- Cylindrical body, 3...Protrusion, 4...Hook claw.

Claims (1)

[Scope of utility model registration request] A cylindrical body having a flange at one end, stacked along the axial direction of the cylindrical body at a predetermined position on the outer peripheral surface of the cylindrical body,
A paper tube cap consisting of a band-shaped steel plate for a key fixed by spot welding, and a hook claw for biting that extends from the steel plate so as to protrude from the other end of the cylindrical body.