JPS59198133A - Manufacture of spiral paper pipe and winding clamping belt for manufacturing spiral paper pipe - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a spiral paper tube and a tightening belt used directly in carrying out this method, and is characterized by adding a twist to the paper tube tightening belt. be.

As is well known, when manufacturing spiral paper tubes (hereinafter simply referred to as paper tubes), as shown in Fig. 1, a single endless belt ■ is placed between two pulleys 00 that sandwich a mandrel ■. A so-called two-tube type is basically used, in which it is wrapped once around a mandrel and then passed around both pulleys. However, with this two-tube type, the belt is wrapped around the paper tube only once, so there is a problem that the tightening time and tightening distance are limited. A three-tube type, four-tube type, or more multi-tube type as shown in the drawing of Publication No. 17568 was developed, and the above problems were solved by using two or more endless belts. The reality is that it is.

The 3-tube type and 4-tube type listed above physically use two belts to tighten one paper tube at two locations in order to increase the time and distance for tightening the paper tube. In addition, even in the case of a multi-tube type, the number of belts used is simply increased.

It goes without saying that the more cylinders there are, the more complicated and expensive the device itself is, the larger the neupaine is required, and the more complicated it becomes to adjust the tension of the belt.

The present invention is fundamentally different from the conventional idea of increasing the number of belts, and is based on a new idea. This aims to extend the time and distance for tightening the paper tube, and allows a two-tube tube to exhibit the same performance as a conventional three to four-tube tube.

That is, in the present invention, a mandrel is sandwiched between two pulleys, and a belt-shaped belt is twisted once to form an endless belt, and a single winding belt is wound around the mandrel twice, and the belt is wound around both pulleys. The paper tube is wound so that the surface of the belt is on the inside, and the paper tube wound on the mandrel is continuously tightened by the winding belt by rotation of a pulley, and then sent out in one direction along the mandrel. This is a method for manufacturing a Nuviral paper tube and a tightening belt used directly in the process.

Next, the configuration and effects of the present invention will be explained.

First, although it may be said that the belt is "wrapped twice" around the mandrel, if you wrap a conventional ordinary endless belt twice, the end edge of one side of the belt will be damaged as shown in Figure 2. When the edge of the belt on the opposite side stands up against the paper tube ■, a biting phenomenon occurs, and conversely, the end edge of the belt on the opposite side (■) rises from the paper tube ■, making it impossible to tighten the paper tube. becomes.

This means that when the belt is wrapped twice, the belt surface,
In other words, the outer surface of the part where the mandre (Vl/C) is wound (the satin patterned part in the figure) is necessarily wound on the outside with respect to the D (IJ+).

Next, when joining the winding belt to an endless belt, twist one side of the butt part half a turn and turn it inside out to make an endless belt (Möbius strip), as shown in Figure 3. In the case of wrapping the belt around the mandrel twice and passing it around the two-tube pulley, in this case, the inside C of the belt that unravels from the mandrel and wraps around the pulley is the upper side, and the side that hangs on the pulley (
On the upper side of the drawing), the paper tube ■ and the belt ■ wrap around tightly and no excessive force is applied to the paper tube, but on the opposite side (lower side of the drawing), the way the belt hangs is reversed, so Similar to the two-turn case shown in FIG. 2, digging and floating phenomena will occur at portions a and b. Therefore, the moving direction of the paper tube ■ may differ depending on the direction in which the belt ■ is twisted or the direction in which the belt ■ is hung, and the pulley ■ may differ depending on the way the belt is hung.
It is inconvenient to handle as it is necessary to change the direction of rotation.

In addition, in the case of this half-rotation twisted belt ■, it forms a Möbius strip and the front and back sides of the belt are continuous, so the glue for bonding the paper tube adheres to the pulley through the belt, so this is always the case. It will be necessary to wipe off the glue.

In the present invention, when manufacturing the winding belt /l/), one side of the abutting part of the band-shaped belt is twisted once, and the fifth pulley
In (2), the hook was placed so that the surface of the belt (2) was on the inside of the pulley. In the tightening mode according to the present invention, since the belt is wound around the pulley in the same manner as the one-time winding shown in FIG. 1, no matter which direction the belt is rotated,
The paper tube (■) and the belt (■) rotate smoothly while in close contact with each other, allowing for reliable winding of the paper tube.

That is, when using the one-turn twisting belt (■) according to the present invention, the paper tube (■) is tightened with the belt (■) wrapped twice around the mandrel (2) on the two-tube tube, and the belt (■) is wound along the mandrel (2). Since the belt is fed by a belt, the tightening distance and time are twice that of the conventional two-piece cylinder and one-time winding, and it has the same capacity as the conventional eight-piece cylinder or four-piece cylinder that uses two tightening belts. This has the great advantage of being able to make the most of it.

Moreover, even though a single tightening belt is capable of producing the capacity of two belts, there are only two pulleys, which makes it easy to adjust the belt tension and is the simplest form of equipment. Therefore, the cost of the device does not increase.

In addition, when manufacturing a paper tube by the method of the present invention, if even stronger tightening is required, it is possible to use an 8-piece tube or a 4-piece tube according to the conventional method and use two belts according to the present invention. Needless to say, it is possible to obtain the same performance as the conventional 6-tube or 8-tube tube.

[Brief explanation of drawings]

Figure 1 is a plan view showing a conventional belt hook, Figure 2 is a plan view showing a conventional belt wrapped twice, and Figure 3 is a half-twisted belt that has just started wrapping twice. Plan view,
FIG. 4 is a plan view of a once-twisted belt according to the present invention wound twice, and FIG. 5 is a perspective view of the belt according to the present invention. 1. Mandrel 21 Paper tube 3. Pulley 4,
Conventional belt5. Half-turn twist belt 6, belt of the present invention

Claims (1)

[Claims] 1) Arranging two pulleys with a mandrel in between, twisting a band-shaped belt once to form an endless belt and wrapping it twice around the mandrel, and wrapping it around both pulleys. The wrapping is passed so that the surface of the winding belt is on the inside, and the paper tube wound on the mandrel is continuously tightened on the winding belt by the rotation of the pulley, and then sent in one direction along the mandrel. A method for manufacturing a spiral paper tube, characterized by: 2) A winding belt for manufacturing spiral paper tubes, which is made by twisting a band-shaped belt once to form an endless shape.