JPH06218728A - Strand cutter - Google Patents

Abstract

PURPOSE:To prevent an occurrence of a local wear by a method wherein a grooved guide is provided so as to reciprocate along a linear cutting part formed by a fixed blade and a rotating blade, and a drive means for reciprocating the grooved guide is connected to the grooved guide. CONSTITUTION:A plurality of strands 7 being supplied are arranged in a line by passing through grooves of a grooved guide 8a. The strands 7 in an arranged state are guided to a feed roller 1, fed to a cutting part 10 by the feed roller 1, and cut into pellets 6 of a predetermined length by a rotating blade 3 and a fixed blade 4. At this time, the grooved guide 8a is reciprocated along the linear cutting part 10 by a predetermined amount by a drive means 11. With this reciprocating movement, the respective strands 7 passing through the grooves of the grooved guide 8a are also reciprocated at a time. The feed roller 1 and the cutting blades 3, 4 are used at fixed local positions in a prior art, but, in this manner, uniformly and effectively used over the substantially full areas. As a result, an occurrence of a local wear is prevented, and a life is extended to a great extent.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a strand cutter for forming pellets by cutting a resin (hereinafter simply referred to as "strand") formed into a strand shape and continuously supplied to obtain a pellet. The present invention relates to a strand cutter in which a cutting blade or the like can be used more efficiently by improving a guide mechanism to a strand cutting portion.

[0002]

2. Description of the Related Art Molten resin discharged in strands is
For example, a strand cutter is known in which the pellet is manufactured by immersing in water, cooling and solidifying, and then cutting into a certain length with a cutting blade to produce pellets. In general, a strand cutter guides strands by a feed roller composed of both top and bottom rollers, feeds the strands into a cutting section composed of a fixed blade and a rotary blade, and pelletizes the strands.

In this type of strand cutter, usually, a large number of strands are sent to the cutting portion at high speed.
Strands tend to tilt and overlap. In order to prevent this, generally, a method of providing a groove guide on the primary side or the secondary side of the feed roller for feeding the strand to the cutting portion and aligning the strand is adopted. With this groove guide, a large number of strands can be aligned in a row to prevent skewing and overlapping of the strands, and to prevent diagonal breakage of the strands and generation of inaccurate pellets at the cut ends.

[0004]

However, in such a conventional strand cutter, there are the following practically insufficient points. That is, since a large number of strands are regulated to a constant traveling position by the groove guide, the feed roller, the fixed blade, and the rotary blade also use the same portion for the thickness of the strand,
The used part causes significant local wear compared to the unused part.

In recent years, various substances such as glass fiber and titanium oxide powder have been added to resins for special purposes. Since these additives impart physical strength to the resin, the above-described local wear of the feed roller in contact with the resin, the fixed blade for cutting the same, and the rotary blade is further accelerated.

The following measures are generally taken against this local wear. When the feed roller is made of metal, various hardening, for example, nitriding quenching is applied to the feed roller, and when the feed roller is made of rubber, the hardness of rubber is increased. Further, for fixed blades and rotary blades, a method of using cemented carbide, for example, special hardened steel or cemented carbide, has been adopted. However, even if such a measure is taken, it cannot be said to be sufficient to prevent the local abrasion that occurs in the passage of the above-mentioned strand. When local wear occurs, the desired cutting ability is prematurely lost.

Therefore, in order to solve the above problems, the present invention enables the feed rollers and the cutting blades to be used evenly and uniformly, prevents the occurrence of local wear, and provides a desired long-term stable operation. An object is to provide a strand cutter capable of exhibiting cutting ability.

[0008]

The strand cutter of the present invention for this purpose is a strand cutter in which a strand guided by a groove guide is divided into small pieces by a fixed blade and a rotary blade. It is provided so as to be capable of reciprocating in a direction along a linear cutting portion formed by a blade and a rotary blade, and a driving means for reciprocating the groove guide is connected to the groove guide.

If the strand cutter has a feed roller, this groove guide is arranged on the primary side of the feed roller. The reciprocating movement of the groove guide is performed linearly or arcuately in the direction along the linear cut portion, and the amount of reciprocating movement is preferably about the strand arrangement pitch or more. Further, the driving means for reciprocating the groove guide may be an independent driving means dedicated to the groove guide, and the driving source is commonly used for driving the rotary blade or the feed roller,
You may make it reciprocate in conjunction with those rotations. Furthermore, this reciprocating motion may be performed continuously or intermittently.

[0010]

In such a strand cutter, the groove guide is reciprocated by the drive means in the direction along the linear cutting portion formed by the fixed blade and the rotary blade, and accordingly, the groove guide is guided. Many strands,
It is reciprocated all at once while maintaining the arrangement state at a constant pitch. Therefore, the positions of the strand feed portion by the feed roller, the fixed blade, and the position of the strand cutting portion by the rotary blade also change according to the reciprocating movement, and the surface of the feed roller and the cutting portion are made substantially uniform over the entire surface and the entire length. You will be able to use it. As a result, the problem of local wear described above is solved.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the strand cutter of the present invention will be described below with reference to the drawings. 1 and 2 show a strand cutter according to a first embodiment of the present invention. In the figure, 1 is a pair of top rollers 1.
A feed roller composed of a and a bottom roller 1b is shown, and the strand 7 is nipped and fed to the cutting portion. 3 is a rotary blade, 4 is a fixed blade, and a linear cutting portion 10 is formed between both blades 3 and 4,
At this portion, the strand 7 is cut into pellets 9 of a predetermined length. In this embodiment, the feed roller 1 and the rotary blade 3 share a drive system (not shown) and can rotate synchronously. These members are surrounded by a casing 5, and a shooter 6 is provided below the cutting portion.
Is provided, and the cut pellets 9 are discharged to the next step.

Grooves are formed on the primary side of the feed roller 1 at a predetermined pitch, and a groove guide 8a for guiding the plurality of strands 7 passed through each groove to the feed roller 1 side is provided. . The groove guide 8a is provided so as to be capable of reciprocating (for example, being slidable) in the direction along the linear cutting portion 10.

The groove guide 8a is provided with an actuator 11 as a driving means for reciprocating the groove guide 8a. The actuator 11 is not particularly limited as long as it can reciprocate the groove guide 8a, and a known cylinder device, linear motor, crank mechanism or the like can be used. The reciprocating driving means (driving mechanism) may be constituted by an independent actuator 11 as shown in FIG. It may be configured to reciprocate. Further, the reciprocating motion may be performed continuously or intermittently. Basically, this reciprocating movement should be performed only when the cutting is actually performed.

The amount of the reciprocating movement may be about one pitch of the arrangement pitch of the strands 7 shown in FIG. 2, but may be smaller or larger than that.

The groove guide 8a is adapted to reciprocate linearly in a direction along the linear cutting portion 10 as shown by an arrow in FIG. This reciprocating motion may be performed in a direction along the linear cutting portion 10. For example, as shown in the second embodiment in FIG. 3, the groove guide 8b reciprocates in an arc shape via a pair of links 12. You may allow it. Further, as shown in FIG. 4 in the third embodiment, the groove guide 8c is constituted by a plurality of rocking pieces 13, and the rocking pieces 13 are simultaneously rocked in synchronization with each other, so that the path of the strand 7 can be controlled. You may make it reciprocate in the direction along the linear cutting part 10.

The operation of the embodiment apparatus constructed as described above will be described with reference to the first embodiment shown in FIGS. 1 and 2. The plurality of strands 7 that have been supplied are groove guides 8
They are aligned in a line by passing through each groove of a, are guided to the feed roller 1 in the aligned state, are fed to the cutting portion 10 by the feed roller 1, and are of a predetermined length by the rotary blade 3 and the fixed blade 4. Is cut into pellets 6.

At this time, the groove guide 8a is reciprocated by the driving means 11 in the direction along the linear cutting portion 10 by a predetermined amount. Along with this reciprocating movement, the respective strands 7 passing through the groove of the groove guide 8a are also reciprocating simultaneously. Since the positions of the feed roller 1, the rotary blade 3 and the fixed blade 4 in the above directions are fixed, the contact position with the feed roller 1 and the cutting position by the rotary blade 3 and the fixed blade 4 are also reciprocated by the reciprocating motion of the strand 7. Move (change) in the direction of movement. Therefore, the feed roller 1 and the cutting blades 3 and 4 do not have a fixed local position as in the conventional apparatus, but the entire range is effectively used effectively. As a result, the occurrence of local wear is prevented and the life is greatly extended.

Below, more specific examples (test results)
Will be described. Using the apparatus shown in FIGS. 1 and 2, the diameter of the top roller is 100 mm, the diameter of the bottom roller is 50 mm, the diameter of the rotary blade is 200 mm, the width of the fixed blade is 302 mm, the width of the rotary blade is 300 mm, and the width of the rotary blade is 300 mm. The number of blades was 40. The number of grooves of the groove guide was 48, the pitch thereof was 5 mm, the width of reciprocating motion was 40 mm, and the reciprocating speed was 2 reciprocating / hour for continuous reciprocating motion. Strand 70m /
When it was supplied at the speed of a minute and operated for a long period of time, it could be continuously used for 4 months. The life of the cutting blade without reciprocating motion could be extended about 3 times.

[0019]

As described above, when the strand cutter of the present invention is used, the groove guide is reciprocated to move the paths of many strands in the direction along the cutting portion. The blades can now be used evenly and not locally, preventing the occurrence of local wear, which has been a problem in the past, and maintaining stable cutting performance for a long period of time. The effect that it can be extended significantly is obtained.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a strand cutter according to a first embodiment of the present invention.

2 is a partial plan view of the apparatus of FIG. 1 taken along the line II-II.

FIG. 3 is a partial plan view of a strand cutter according to a second embodiment of the present invention.

FIG. 4 is a partial plan view of a strand cutter according to a third embodiment of the present invention.

[Explanation of symbols]

 1 Feed Roller 3 Rotating Blade 4 Fixed Blade 5 Casing 6 Shooter 7 Strands 8a, 8b, 8c Groove Guide 9 Pellet 10 Linear Cutting Part 11 Driving Means 12 Link 13 Swinging Piece

Claims (4)

[Claims] 1. A strand cutter, which divides a strand guided by a groove guide into pieces by a fixed blade and a rotary blade, wherein the groove guide extends in a direction along a linear cutting portion formed by the fixed blade and the rotary blade. And a drive means for reciprocating the groove guide is connected to the groove guide. 2. The strand cutter according to claim 1, wherein the strand cutter has a feed roller that feeds a strand to the cutting portion, and the groove guide is disposed on the primary side of the feed roller. 3. The groove guide is linearly reciprocally provided in a direction along the linear cut portion.
Or a 2 strand cutter. 4. The groove guide is provided so as to reciprocate in an arc shape in a direction along the linear cut portion.
Or a 2 strand cutter.