JPH0791699B2 - Fiber cutting equipment - Google Patents

Description

The present invention relates to a synthetic fiber used as a reinforcing material for a composite material,
The present invention relates to a fiber cutting device for cutting carbon fiber, glass fiber, steel fiber and the like.

(Prior Art) Conventionally, in order to continuously mix reinforcing short fibers into a resin for composite material, long fibers are quantitatively supplied to the resin for composite material while being cut at a constant speed.

Various types of such devices have been conventionally used according to the type of fiber, and a typical one of them is described with reference to FIG. In FIG. 1, the long fiber 1 is sandwiched between rollers 2 and 3 made of rubber or plastic, and the cutting edge of the cutting tool 4 is arranged on the outer peripheral surface of the rotary body 5 so as to contact with or invade the surface of the roller 3. Is supplied to the cutter unit and is cut at the contact between the blade edge and the roller 3 by the action of pressing folding and pressing cutting with no tension and impact.

(Problems to be solved by the invention) However, high-performance fibers typified by aramid fibers have extremely high cutting resistance, and unlike conventional glass fibers, carbon fibers, etc., they can be easily cut by pressing folding and pressing cutting. Absent. Greater impact and cut forces are required to cut such fibers with the prior art.

For that purpose, it is necessary to increase the amount of the blade edge of the blade 4 biting into the roller 3 and make it sharper. However, if this is done, the flaws on the surface of the roller 3 and the damage to the blade edge will rapidly increase, and it will increase to several tens. The fiber cutting ability can be maintained only for a few seconds to a few minutes.

Therefore, the inventor of the present invention has reached the present invention as a result of earnest studies on the cutting of fibers having such a large cutting resistance. That is, in addition to the conventional pressing folding and pressing cutting, a new cutting method was developed in which sliding cutting was performed by sliding the blade while keeping the fiber in a tension state. The tension state of the fiber is, for example, in FIG. 2, the uneven portion 1 of the rollers 10 and 10 '.
When the fibers 1 and 12 mesh with each other, the long fibers 1 supplied by the roller 10 and the nip roller 2 are bent along the uneven shape at the biting part, resulting in a difference in length due to bending (tension due to extension). Occur.

(Means for Solving the Problem) That is, the present invention is a fiber cutting device comprising a pair of rollers having irregularly meshing irregularities, in which a blade is provided in a convex portion, and the pair of rollers having irregularities mesh with each other at a position where they mesh with each other. The fiber cutting device is characterized in that the fiber is cut at the same time that the fiber is bitten by sliding the blade. The present invention will be described below with reference to FIG.

In FIG. 2, reference numerals 10 and 10 'are rollers having a pair of concave and convex portions which mesh with each other. Reference numeral 2 denotes a fiber supply nip roller which is pressed against the roller 10. Long fiber 1 is roller 10
(Or 10 ') is fed at a speed that accompanies the rotation of the outer peripheral portion of the convex portion and the nip roller 2, is bent along the unevenness at the biting portion, and is stretched and tensioned due to the difference in length accompanying the bending. To be made.

As shown in FIG. 3, this biting portion is a portion consisting of the convex portion 11 and the concave portion 12, and a part 13 of the protrusion of the convex portion 11 is cut off to form a low protrusion 14. At this portion, the cutting edge is equivalent to the cutting portion 13. The blade 4 is attached to the long fiber 1 at a height of 1, and slides in a direction perpendicular to the long fiber 1. The sliding direction does not necessarily have to be a right angle.

(Embodiment) An embodiment of the present invention will be described below with reference to FIGS.

FIG. 4 is a schematic sectional view. FIG. 5 is a side view of a portion to which a blade is attached. FIG. 6 is a transverse sectional view of a sliding mechanism of the blade.

Fig. 4 shows a pair of roller standard spur gears 20 and 20 'and spur gear 20' having irregularities that mesh alternately with each other on the outer periphery to press the long fiber 1
The nip roller 2 for controlling the speed and the approaching direction of the sheet and the air flow type conveying device 21 for sucking and discharging the cut short fibers. As shown in FIGS. 5 and 6, the blade 4 has one notch for each number of teeth of the spur gear 20 (or 20 ') to form a low tooth 22, and a groove 23 is provided on the tooth so that the cutting edge is As the blade 4 is located on the outermost circumference and is slidable in the width direction of the tooth,
Set up in. At this time, the height of the cutting edge is the same as the height of the notch. The blade thickness is preferably 0.2-2 mm.

The blade 4 was slid at a position where the long fibers were in contact with the cutting edge and the tension was maximized at the position where the spur gears 20 and 20 'meshed with each other. As shown in FIG. 6, the blade 4 is attached to a pin 24, and the pin contacts the tip 25 and comes into contact with a protruding cam 26, which slides leftward while compressing the compression spring 27 along the shape of the cam. The spring 27 restores to the right by releasing the cam.

Here, the standard spur gears 20 and 20 'are preferably those with a higher meshing ratio, with pressures of 14.5 °, modules (abbreviated as M for tooth size) 2.5 number of teeth 36, width 55mm, low teeth 22 Is a spur gear 20 and 12 out of 36 are installed at equal pitch, and module M = 2.
Lowered by a considerable amount of 5.

The blade 4 is made of super hard steel with a tooth length of 40 mm and a thickness of 0.3 mm, the sliding width is 10 mm, and the sliding time is equally divided on the line connecting the centers of the gears 20 and 20 '(meshing center point). The reciprocation is completed within an angle corresponding to the gear engagement rate.

The method of transmitting the rotational force (not shown) is that the shaft of the gear 20 '(or 20) is the main shaft, and a pair of gears is installed on the shaft with the gear 20 (or 20') so that there is no speed difference. I decided.

(Effect) As a result of supplying 15,000 De of long aramid fibers at a speed of 100 m / min and cutting with the above device, good cutting performance was obtained and continuous cutting for 30 minutes or more was possible.

[Brief description of drawings]

 FIG. 1 is a schematic side view showing a typical conventional device. FIG. 2 is a schematic side view of the present invention. FIG. 3 is an enlarged sectional view of a cut portion of FIG. 1. FIG. 4 shows an embodiment of the present invention. Schematic side view FIG. 5 is a side view showing the mounting of the cutting tool of FIG. 4. FIG. 6 is a cross-sectional view of FIG. 1 …… Long fiber 2 …… Nip roller 3 …… Roller 4 …… Blade 5 …… Rotating body 10,10 ′ …… Roller with irregularities on the outer peripheral surface 11 …… Convex section 12 …… Concave section 13 …… Cut section 14 …… Low protrusion 20,20 ′ …… Standard spur gear 21 …… Air flow suction device 22 …… Low tooth 23 …… Sliding groove 24 …… Sliding pin 25 …… Sliding pin tip 26 …… Sliding Dynamic cam 27 ... compression spring

Claims (1)

[Claims] 1. A fiber cutting device comprising a pair of rollers having concaves and convexes that mesh with each other, wherein a blade is provided on a convex portion, and at the position where the pair of rollers having the concaves and convexes meshes with each other, the blade is cut at the same time. The fiber cutting device is characterized in that the fiber is slid to cut the fiber.