JPS6233588Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to tongs for cigarette winding tubes. In a known continuous rod-shaped cigarette manufacturing machine, the tobacco shreds placed on the wrapping paper are placed on an endless garniture tape that is provided to transport the shredded tobacco, and the cigarette rod formation called the winding tube section is carried out. During passage through the device, the wrapping paper is wrapped around the shredded tobacco layer. In this wrapping, prior to wrapping with a ribbon-shaped wrapping paper, the shredded tobacco on the wrapping paper is compressed and formed into a rod-shaped cigarette rod, and the wrapping paper is guided around this in a circular manner to perform the wrapping. .

A tonga is used as a guide tool for compression molding the shredded tobacco into a cigarette rod. The tongue itself is sometimes referred to as a compression tongue, tongue, or the like, and is well known as a component of a cigarette tube.

The tongs are guide tools whose inner surface is a semicircular tunnel shaped like a semi-truncated conical tube, that is, the cross-sectional area is gradually reduced so that the shredded tobacco passing through the tongs is sequentially compressed. Conventionally, the guide surface has been formed into a smooth surface and an inclined surface in which the radius of the inner surface of the tunnel is linearly reduced from the entrance to the exit.

Incidentally, the most important concern for cigarette manufacturers is to operate cigarette manufacturing machines efficiently. Therefore, efforts are being made to eliminate causes of trouble that would cause the cigarette manufacturing machine to stop.

There are many causes of the troubles mentioned above, but in general, the shredded tobacco caused by clogging of the tongs occurs during the guiding process of compressing the bulky shredded tobacco, whose width is limited when it is placed on the wrapping paper, into a cylindrical rod-shaped cigarette rod. Problems in the supply system occur frequently. Generally, 1% of the operating time of a cigarette making machine,
It accounts for a considerable amount of time, accounting for approximately 10% of downtime. Therefore, eliminating such causes was an urgent issue.

It is known that when the tongs are used for a long time and the inner surface of the tongs becomes mirror-finished, the contact surface with the shredded tobacco transported at high speed increases, and the tobacco becomes clogged in the tongs. In order to prevent this, there is a known invention in which the inner surface of the tongs is sandblasted.

Furthermore, it has been pointed out that the resistance of the tobacco shredding compression molding path causes speed fluctuations in the tobacco shredding, and therefore it has been proposed that the compression molding path be formed by a large number of protrusions scattered on the inner surface of the tongs. Ta. It is considered that this is because the contact resistance is reduced by the air film and compression molding is facilitated by the vibration of the air film.

Incidentally, in recent years, as the use of expanded and specially processed tobacco shreds for cigarettes has increased, there has been a trend toward bulkier tobacco, and as cigarette manufacturing machines have become faster, tar (resin) has become attached to the tongs. I've started to see more things to do. The adhesion of resin tends to impede the smooth running of shredded tobacco and cause the tongues to become clogged.

It was also found that when the tongs were heated to a high temperature of 80°C due to the friction caused by the sliding of the shredded tobacco, resin adhering to the tongue surface rapidly grew.

As a countermeasure against tar, attempts have been made to supply cold air to the tongs and impregnate the inside of the tongs with Teflon material, and it has been found that some results can be obtained. There is a tendency to encourage minute bite,
When using Teflon, there is dissatisfaction with its durability.

In view of these circumstances, the present invention was developed based on the results of many tests, with the aim of suppressing the temperature rise of the tongs, thereby contributing to the prevention of clogging of the tongs due to tar adhesion.

The present invention relates to a tong for a cigarette winding tube consisting of a semi-truncated conical tube shape that holds and guides a tobacco layer to form a cigarette rod, in which the tubular guide surface is arranged in steps with conical surfaces having a smaller diameter in the direction in which the tobacco travels. The tongue is characterized by being formed on a shaped guide surface.

Next, the present invention will be explained in detail with reference to the drawings.

In FIG. 1, reference numeral 1 denotes an endless porous band which is driven in the direction of the arrow by a drive roller 1-1. An intake chamber (not shown) is arranged above the porous band 1,
Air is drawn into the intake chamber through the perforated band 1, and shredded tobacco carried by the air flow is attracted to the lower surface of the perforated band 1. The intake chamber extends to a position below the drive roller 1-1.

A perforated band 1 of considerable length extends over a wrapping paper 4, which is guided over guide rollers 4-1 and 4-2 so as to run horizontally towards the left in the figure; And it is supported by the endless garniture tape 5. The garniture tape 5 is mounted on rollers 5-2, so as to run through the garniture trough guide 5-1.
Passed 5-3.

The perforated band 1 and the wrapping paper 4 enter the collection channel in the area where they overlap. The wrapping paper 4 is arranged to move at the same speed as the porous band 1.

The garniture trough-like guide 5-1 gradually changes its cross-sectional shape from the roller 4-2 to a position immediately in front of the end of the intake chamber, forming the garniture tape 5 into a substantially U-shaped cross-section.

At the end of the intake chamber, the perforated band 1 and the wrapping paper 4 are close enough to each other to engage and grip the tobacco at the same time as the shredded tobacco. Next to the perforated band 1 above the wrapping paper 4, a tobacco shredding and compression molding path consisting of a compression shoe 2 and tongs 3 is provided.

The winding part 6 provided in the next process of the tongs 3 is
One edge of the wrapping paper 4 is wrapped around the shredded tobacco, and then the other edge is glued by the gluing section 7 and then this edge is wrapped. A drying section 8 and a rod-shaped tobacco cutting section (not shown) are sequentially provided in the next process of the winding section 6, and after drying the glued portion of the edge in the drying section 8, individual pieces of a predetermined length are Cut into cigarettes.

An example of implementation of the tongs according to the present invention is shown in FIGS. 2 and 3.

The tongue 3 has a semi-circular tunnel-shaped inner surface provided with a step-like guide surface 3b, which will be described later, but its basic shape is a semi-circular tunnel in which the internal cross-sectional area is gradually reduced in the shape of a semi-truncated conical tube. is internalized. A fixture 3a is provided on the back of the tongs 3, and is used to facilitate attachment to a machine.

The guide surface 3b is formed into a stepped guide surface by arranging conical surfaces whose diameters become smaller in the direction in which the shredded tobacco travels, the radius of which decreases sequentially.
That is, the shredded tobacco traveling along the guide surface is compressed, then loosened, and further compressed,
While repeating compression and loosening, as if being loosened,
It is sequentially compressed and formed into a cigarette rod of a predetermined shape.

According to an example of implementation, 35 step surfaces 3b were formed at equal intervals of 3 mm in the total length of the tongs 3 of 105 mm.

In a test using the tongs, it was confirmed that the temperature increase of the tongs was small and the temperature drop was approximately 20° C. or more compared to the conventional type without the stepped guide surface 3b. Therefore, it has been found that the tongs according to the present invention can extremely effectively prevent tar adhesion.

Examining the tendency of wear of the tongs, it is found that in the tongs according to the present invention, each stepped guide surface 3b
It is evenly distributed and shows a tendency to become mirror-like.
Looking at this for the conventional type without the stepped guide surface 3b, the mirror surface formation is promoted near the tip exit end where compression progresses, which is consistent with what those skilled in the art have already known from experience. Therefore, it is considered that conventional tongs have an overheated area near the end, and that a large amount of tar adheres to the end due to the heat generated.

As described above, according to the present invention, the inner surface of the tongs is formed into a step-like guide surface, which suppresses the temperature rise of the tongs and prevents resin adhesion, thereby eliminating troubles caused by the tongs. The tongs are suitable for machining and can be mass-produced with high precision.

[Brief explanation of the drawing]

Fig. 1 is a front view schematically showing a cigarette winding tube section equipped with the tongs of the present invention, Fig. 2 is an oblique perspective view of the tongs of the present invention, and Fig. 3 is a front view showing a cross section in the axial direction of the same. It is a diagram. 3...Tongs, 3b...Step-shaped guide surface.

Claims (1)

[Scope of utility model registration request] In a tong for a cigarette winding tube, which is a half-truncated conical tube that holds and guides a tobacco layer for the cigarette rod type, the tubular guiding surface has a large number of conical surfaces arranged in a direction that decreases in diameter in the direction of tobacco travel, and each conical surface A tong for a cigarette winding tube, characterized in that the connecting surfaces of the tongs are connected in a step-like manner such that the inner diameter increases in the direction in which the cigarette travels.