JPS5929234B2 - Cigarette filter manufacturing equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is an apparatus for manufacturing a cigarette filter by processing a fiber bundle rewound from a bale, comprising means for transporting the fiber bundle; A filter manufacturing device comprising: a deflection device that makes it possible to stretch a fiber bundle taken from a bale; a pair of tension rollers, one of which is driven by a motor; and a pair of expansion rollers, one of which is driven by a motor. Regarding.

A device of this type is disclosed in Swiss Patent No. 469,449.

In this conventional device, after passing through the deflection device, the fiber bundle passes sequentially between a pair of tension rollers and between two pairs of expansion rollers, and then passes in front of a blower device.

This air blowing device is for separating fibers forming a fiber bundle into pieces, and is a wind spreading device (aerod).
Also called dynamic spreader.

The fiber bundle unwound from the bale often contains longitudinal folds, and the expansion rollers serve to loosen these folds.

However, the tension in the fiber bundle between the deflection device and the expansion roller is often so great that the folded portion of the fiber bundle cannot be loosened.

The tensile effect of the tension roller is insufficient to loosen the fold.

Therefore, the folded portion is crushed without being spread, resulting in an excessively thick portion, which prevents the fiber bundle from being expanded properly between the expansion rollers.

This undesirable effect is noticeable in the case of acetate ropes whose filaments have a low denier number.

In the device of French Patent No. 1,459,679, the folded part is crushed before the fiber bundle passes in front of the blower, but this device also has the disadvantages mentioned above.

It is an object of the invention to provide a device of the above type, which is constructed in such a way that the folded portion of the fiber bundle is loosened before being crushed.

According to the present invention, there is provided an apparatus for manufacturing a cigarette filter by processing a fiber bundle unwound from a bale, comprising: means for transporting the fiber bundle; and a fiber bundle taken from the bale. a pair of tension rollers, one of which is driven by a motor, and at least one pair of expansion rollers that are driven by a motor, downstream of said tension roller. An air blower is provided near the tension roller, and a pair of passive spreading rollers are provided downstream from the air blower, and the rotation speed of the motor that drives the tension roller is equal to the rotation speed of the expansion roller. A device characterized in that it is associated and controlled is provided.

The addition of a pair of passive spreading rollers downstream of said tensioning rollers creates an area where the tension in the fiber bundle is reduced, thus reducing the action of the blower between these two pairs of rollers, i.e. the fiber Bundle spreading action is promoted.

By changing the control ratio, that is, the speed ratio of the tension roller, the tension of the fiber bundle and its spread width can be controlled.

This spreading effect can also be controlled by adjusting the pressing force of the passive spreading roller.

In fact, by varying the pressing force of the pair of spreading rollers, one made of rubber and the other made of steel, the degree of deceleration of the fiber bundle at this position can be adjusted, and thus the tension of the fiber bundle at the location of said blower device. can be changed.

It is worth noting that by adjusting either the control ratio or the pressing force of the spreading roller, the width of the fiber bundle in the spreading region can be adjusted rapidly and with great precision.

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

The device shown in the figure, which is an embodiment of the present invention, has a deflection device 1 made of a metal plate with bent ends, and this deflection device 1 is fixed to the end of an arm 2. .

Since the arm 2 also supports the first air blower 3,
Also called blower support arm.

The blowing device 3 first acts to expand the fiber bundle 4 made of acetylcellulose fibers which have been unwound in the bale 5.

In order to enable the laterally folded portion of the fiber bundle to unfold under the weight of the fiber bundle itself, the deflection device 1 is arranged at a distance above the bale 5.

The illustrated device has a pair of tension rollers 6.7.

The tension roller 6 has a rubber surface and is driven by an electric servo motor 8, while the tension roller T is a steel presser roller whose shaft is connected to a pneumatic jack 9. ing.

The pressing force of the pneumatic jack 9 can be adjusted using a valve 10 and a pressure gauge 22.

The fiber bundle 4 passes in front of a Q blower device 11, which is known per se, and then between a pair of spreading rollers 12,13.

The spreading roller 12 is made of rubber, while the spreading roller 13 is made of steel and its shaft is connected to a pneumatic jack 14.

The pressing force of the pneumatic jack 14 can be adjusted using the valve 15 and the pressure gauge 23.

The fiber bundle then passes between a first pair of expansion rows 216, 170, one of which 16 is a hold-down roller with a rubber surface and the other roller 1T is a steel roller driven by a motor. .

The fiber bundle then passes between a second pair of expansion rollers 18, 19, similar to the pair described above, and is pulled and guided by a pair of rollers 21 through the plasticizing chamber 20.

The rotation speed of the servo motor 80 is controlled in relation to the rotation speed of the first pair of rollers 17 of the expansion roller.

By tensioning the fiber bundle 4, the tension rollers 6.7 reduce the tension in the fiber bundle at the location of the blower 11, thus allowing freer expansion of the fiber bundle and eliminating longitudinal folds.

The spreading rollers 12 and 13 not only apply a pressing force to the fiber bundle whose fibers have been broken apart by the blower 11, but also act on the fiber bundle at the position of the blower 11 by delaying the progress of the fiber bundle. It acts to reduce tension.

Therefore, there are two means for adjusting the tension of the fiber bundle at the location of the blower, and by adjusting these two easily controllable parameters, the spreading dust of the fiber bundle can be set to an optimum value.

BRIEF DESCRIPTION OF THE DRAWINGS The figure is a schematic side view showing an apparatus according to an embodiment of the present invention. Explanation of symbols of main parts, 1...Deflection device, 2.
-...Blower support alarm, 3,11...
・Blower device, 4... Fiber bundle, 5... Rope packing, 6, 7... Tension roller, 8...
... Servo motor, 9, 14 ... Pneumatic jack, 12, 13 ... Curved spreading roller, 16° 17, 18,
19...Question expansion roller.

Claims (1)

[Scope of Claims] 1. An apparatus for manufacturing a cigarette filter by processing a fiber bundle unwound from a bale, comprising means for transporting the fiber bundle and a means for transporting the fiber bundle unwound from the bale. a deflecting device that allows stretching the fiber bundle, a pair of tension rollers, one of which is driven by a motor, and at least one pair of extension rollers that are driven by a motor, the deflection device being configured to extend the fiber bundle downstream of the tension roller; A blower device is provided near the tension roller on the side, a pair of passive spreading rollers are provided downstream from the blower device, and the rotational speed of the motor driving the tension roller is controlled by the expansion roller. A device characterized in that it is controlled. 2. The apparatus according to claim 1, further comprising means for adjusting the pressing force of the spreading roller against the fiber bundle.