JPS62299519A - Equipment for cutting fiber tow - Google Patents

Abstract

PURPOSE:To enable the cutting of a fiber to short fibers in high efficiency, by using a drum having a number of cutting blades radially supported on the drum periphery, winding a fiber round the drum and pressing the fiber against the cutting edges with plural press rollers. CONSTITUTION:A press-cutting type drum cutter comprises a drum 11 having a number of radially supported cutting blades 12 and placed between a pair of rotors 3a and 3b and a plurality of free-running rollers 21, 21' arranged along the drum 11 and used for pressing fibers Y wound up on the outer periphery of the supported cutting blades 12. The fibers Y are pressed against the cutting blades 12 by this action.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention [Industrial Application Field 1 The present invention is a synthetic fiber cutting device, particularly for cutting short cut cotton (cut length 2 to 20 mg) used for paper making, etc. Regarding equipment.

[Prior Art] Conventionally, various types of fiber cutting devices are known, and among them, there is a drum cutter type device as illustrated in FIGS. 3 and 4.

To explain the outline, 1111 is wound around a drum 3 in which cutting blades 2 are embedded radially, and for winding, a thick rolled 11111 is placed at a constant distance from the cutting edge of the drum 3 using a presser roller. When it is wound thicker than the outer circumferential position of the drum 3, it is pressurized by the presser roller 4 and
The innermost layer of fibers 1 wound around the drum is cut from the part that comes into contact with the cutting blade 2, and the cutting is carried out through the discharge port 5 at the bottom of the drum.
is discharged from.

The drum 3 includes a pair of rotors 3a and 3b, each of which is provided with a corresponding slit 6.7 for attaching a cutting blade, and the cutting blade 2 is inserted into the slit 6.7. A U-shaped holder 8 is fixed.

Such conventional equipment is for cutting cotton with a relatively long fiber length (often 32 or more) for use in spinning yarn or stuffing. The resistance to ejection to the outside was dominant, and one pressing roller was sufficient.

Demand for short-cut cotton for paper making and non-woven fabrics has recently increased.

When cutting short-cut cotton with a conventional cutter, the number of cutting blades is large (and the gap between the cutting blades is small, so the cutting resistance and the passing resistance between the cutting blades are large, which causes the cut cotton to stick to each other. Due to excessive pressure while passing through the blades, they become entangled or twisted, causing serious quality defects in subsequent processes, as well as causing blade breakage and extremely shortened blade life.Therefore, they are introduced into cutters. The disadvantage is that the thickness of the tow to be processed is limited, and the processing capacity is greatly reduced, impairing the productivity of the equipment.

Conventional cutters that cut cotton with a relatively long fiber length usually increase the processing capacity by increasing the diameter of the drum, but as mentioned above, this is because the processing capacity is increased from the inside of the drum to the outside of the drum. This method is effective because it is controlled by the discharge resistance, but for short-cut cotton, the processing capacity is controlled by the cutting resistance of the cutting blades and the passing resistance between the cutting blades, so it is recommended to increase the drum diameter. This problem could not be solved using conventional methods.

Here, the distribution of the cutting work of the drum cutter on the tow Y in the drum 3 is as shown in FIG.
360'), the cutting work is done only in the 3 to 5° range where it contacts the presser roller, and the other parts do not contribute to the cutting work.

As shown in Fig. 6, as the processing De increases, the angle angle used for this cutting job expands slightly, but
The amount of cutting per unit rotation at the cutting start point increases, and therefore the cutting resistance of the cutting blade and the passing resistance between the cutting blades increase, which causes the above-mentioned trouble (here, if the drum diameter is 45
4#W, drum blade width 30M, presser roller diameter 25ONR,
The cut length is 5M).

[Object of the Invention] The present inventors analyzed such a cutting mechanism and repeated improvement experiments, and as a result, they arrived at the present invention.
The aim is to provide a cutting device for cut cotton with high cutting capacity and good quality.

[Structure of the Invention] That is, the present invention is a drum cutter-type m-fiber cutting method in which the fibers to be cut are wrapped around a drum in which cutting blades are embedded radially between slits formed in a pair of facing rollers, and the fibers to be cut are pressed by a pressing roller. This is a fiber bundle cutting device characterized in that a plurality of rotatably supported pressing rollers are provided along a drum.

By providing a plurality of presser rollers in this way, the cutting work during one rotation of the drum can be effectively distributed among the eight presser rollers.
This makes it possible to achieve the purpose of increasing the throughput of the cutter without causing quality defects due to cutting resistance by increasing the operating rate of the cutting work performed by the cutting blade during one rotation of the drum.

[Example] The present invention will be explained below based on the drawings. FIG. 1 is a schematic bottom view showing an embodiment of the present invention.

In the figure, reference numeral 11 denotes a drum similar to that shown in FIG. 3, which has a cutting blade 12 inside, is rotatably supported by a machine stand 14, and has a hollow portion opened with an outlet 13 for discharging the cut fibers.

20, 20' are the first . The second pressing roller 20.20' consists of a roller main body 21.21' that directly contacts and presses the fibers and a holder 22.22' that supports this. Since the surface pressing roller 20' has a structure substantially similar to that of the pressing roller 20, a description thereof will be omitted. The holder 22 has a machine frame 23 attached to the machine base 14, and a pair of parallel guide rods 25, 26 and a slide block 27 slidably held by the guide rods 25 and 26 are provided on the machine frame. Furthermore, a fluid pressure cylinder 28 is provided which is connected to the slide block 27 and moves it forward and backward to press it to a predetermined pressure. Two support shafts are provided at the tip of the slide block 27 (on the drum 11 side) to protrude in a direction parallel to the axial direction of the drum 11, and the roller body 21 is rotatably held on the support shafts 29 via bearings. ing. 30 is a stopper of the slide block 27 provided on the machine frame 23, which is screwed into the machine frame 23 and fixed with the fixing nut 31.
(This is not necessarily required) (any other arbitrary means may be used), and the presser roller 20
A predetermined gap is provided between the roller body 21 and the cutting blade 12.

Here, as shown in FIG.
A portion of the inner layer of the wound tow is cut off from the portion that contacts the cutting blade and discharged into the drum.

Subsequently, it is further cut in the same manner by the second pressing roller 20', and the wrapping thickness is cut into two stages by an amount corresponding to the increment in the wrapping thickness due to the introduced tow Y.

In this case, it is desirable to equalize the amount of cutting by the first presser roller 20 and the second presser roller 20', and in the device shown in FIG. The winding thickness increment due to Y is t.

The distance between the first presser roller 20 and the cutting blade 12 is set to 61. Second
If the distance between the presser roller 20' and the cutting blade 12 is 62, then δ1-δ2-t/2.

In addition, the pressing force of the first presser roller 510 and the second presser roller 20' is made the same, and the second presser roller 20' and the cutting blade 1
2 and the first presser roller 20.
Measures such as setting the pressing force to a pressure that can obtain a cutting amount corresponding to 1/2 of the increase in the winding thickness of the tow Y may be adopted as necessary.

Although this embodiment has been described with reference to two presser rollers, it goes without saying that the same applies to a case with three or more presser rollers.

Next, to explain the effects of the present invention in more detail, using a device as shown in Fig. 1, a single yarn denier of 1°5 de, a cut length of 5 m, a drum cutting edge diameter of 454 m+, and a drum cutting width of 30 m are used.
Table 1 shows the results of various tests conducted by changing the tow supply denier, processing speed, etc.

As is clear from Table 1, the burden on one presser roller is reduced and short cut cotton of good quality can be obtained even at a high capacity.

[Effects of the Invention] As explained above, according to the present invention, the cutting of tow within the drum is evenly distributed among the plurality of presser rollers, so even when a large amount of tow is processed, the cutting resistance of the blade surface is reduced. , the monthly passage resistance is small, making it possible to stably obtain high-quality short-cut cotton.

[Brief explanation of the drawing]

1 and 2 are a schematic bottom view and an action explanatory diagram showing an embodiment of the present invention, FIGS. 3 and 4 are a schematic plan view and a cross-sectional view showing a conventional embodiment, and FIGS. FIG. 6 is an explanatory view of the operation of the conventional embodiment, FIG. 5 is an explanatory view showing the relationship between drum rotation and cutting m, and FIG. 6 is an explanatory view showing the relationship between blade position and cutting amount. 11...Drum, 12...Cutting blade. 20, 20'...presser roller. 21, 21'...0-ra body, 22.22'
...Holding tool. 27...Slide block, 30...Stopper!
! 11I! 1!211 Y 3rd @ 3!4gi! 1!5111 Drum times [(”) !6 figure

Claims (1)

[Claims] A drum cutter-type fiber cutting device in which the fibers to be cut are wrapped around a drum in which the cutting blades are implanted radially between slits formed in a pair of facing rotors, and the fibers to be cut are pressed by a pressing roller, and the device is rotatably supported. A fiber bundle cutting device characterized in that a plurality of presser rollers are provided along a drum.